ࡱ> Eq`bjbjqPqPr0::W~~~~555$6~G~G~G~G2I6qIv@M@M@M@MN;PPDooooooo$shvBo5~RNN~R~Ro~~@M@Mgvqccc~Rj ~R@M5@Moc~Rocc:i,+" 5i@MI eI5~G[@=i coq0qGiRBw(_NBwii&Bw5iQZ]Q@cQ4QQQQoov`pQQQq~R~R~R~R666DZG$666ZG666~~~~~~ Extent of geotechnical testing for pile excavation in port of Dubrovnik M. Bandi & B. Galjan Investin~enjering d.o.o., Zagreb, Croatia I. Barbali & N. `tambuk Cvitanovi Institut IGH d.d., Split, Croatia I. Vrkljan Institut IGH, Sector IGH Institut; Department IGH Laboratory, Croatia; University of Rijeka, Faculty of Civil Engineering, Rijeka, Croatia ABSTRACT: After noticing poor rock penetration performance during pile excavation works, contractor induced additional site investigation to support his claim on higher rock strength than previously inspected. Results of 115 point load tests and 97 uniaxial tests were fitted to Weibull and Gamma probability density functions. One-sided confidence interval with confidence level of 95% (CI95) for strength value which is higher than 95% of population (i.e. 95% percentile) was obtained with "Likelihood Ratio Confidence Bounds" method. Suggestion on number of specimens is given for percentile interval estimation in future geotechnical investigation works. InTroduction Poor rock penetration performance plus high wearing of equipment were noted during pile excavation works for a reconstruction of passenger port Dubrovnik, Croatia. Piles of 1800 mm diameter were excavated trough surface deposits, mud, hard to stiff clay and penetrated for 4.50 m in carbonate limestone/dolomite rock. Contractor expressed doubts on range of previously obtained rock strengths from geotechnical report, which gave unconfined compression strength (UCS) of 7 specimens, in range from 31 to 137 MPa. Reported rock strengths, together with rock quality designation (RQD) were basis for excavation equipment selection. To explore his doubts, 11 additional investigation boreholes were performed. Ten investigation boreholes were positioned on a zone previously described as compact limestone rock mass were poor excavation performance encountered and one in zone previously described as highly fragmented and weathered limestone/dolomite rock mass (Vrkljan et al. 2007). Overall 97 cylindrical samples were uniaxially tested in compression with results in range from 21 to 262 MPa. In addition to UCS, 115 point load tests (PLT) were reported (from 15 to 185 MPa UCS equivalent), but tests specimens for both test methods were not all obtained from same locations. All UCS strengths were corrected to L / D = 2 standard specimen ratio (Thuro at al. 2001), and PLT specimens were transformed to UCS strengths with conversion factor 24 (Rusnak et al. 1999).  Figure  SEQ Figure \* ARABIC 1. PLT correlated to UCS histogram and applied fits (dash line Weibull and continuous line Gamma). Excavation performance is mainly influenced by several factors as; excavation method, machinery features, working place (on shore/off shore), periods of breakdown and maintenance, weather conditions, presence of boulders and fissures, slope of bedding planes (rock surface), supervision and motivation, intact rock characteristics, rock mass characteristics and experience (competence) of operator and his crew (Bunning et al. 2007). This article deals only with intact rock characteristics and offers statistical method for estimation of strength value, which is with certain confidence level (e.g. 95%) higher than selected percent of intact rock population (e.g. 95%). Described procedure could be used in future projects where intact rock strength plays important role in excavation equipment selection.  Figure  SEQ Figure \* ARABIC 2. PLT correlated to UCS cumulative distribution (dots) and applied fits (dash line Weibull and continuous line Gamma). Weibull and Gamma distribution functions Results of PLT and UCS tests were fitted to Gamma and Weibull probability density functions. The probability density functions (PDF) f(x;), for both PLT and UCS data are assumed to be continuous, non negative and two parameter. Weibull PDF (Figs 1, 3) is defined with relation:  EMBED Equation.3  ( SEQ .eq \* MERGEFORMAT 1) where x = random variable; e = the base of the natural logarithm; kW > 0 is shape parameter and l > 0 scale parameter. Gamma PDF is defined with relation:  EMBED Equation.3  ( SEQ .eq \* MERGEFORMAT 2) where G = Gamma function; kG > 0 is shape parameter and G > 0 scale parameter. The cumulative distribution function (CDF) F(x;), is defined as integration of PDF f(s;) (Figs 2, 4), from -" up to a variable x:  EMBED Equation.3  ( SEQ .eq \* MERGEFORMAT 3) where symbol q presents Weibull parameter list values {kW, l} or Gamma parameter list values {kG, G}. The Weibull and Gamma distributions are used in engineering for reliability analysis which deals with failure times in mechanical systems (i.e. life data analysis). In this article, PLT correlated to UCS and UCS data corresponds to random variable x. Estimation of parameters for Weibull and Gamma distribution Parameters of Gamma and Weibull distribution fits (See Figs  REF HistPLT \h 1,  REF HistUCS \h 3) were estimated by the "Maximum Likelihood" (ML) method, as better estimator of parameters for large samples than "Matching Moments Method" (Lloyd & Lipow 1962). Weibull distribution has better fit than Gamma for PLT correlated to UCS data, while Gamma distribution has better fit than Weibull for UCS data, all in terms of greater likelihood function value. ML parameters for Weibull and Gamma PDF fitted to PLT and UCS data are shown in Table  REF TabelaParam \h  \* MERGEFORMAT 1, where L is value of likelihood function. Table  SEQ Table \* ARABIC 1. Maximum likelihood parameters for Weibull and Gamma PDF fitted to PLT and UCS data. ___________________________________________________ Data sets PLT corre- UCS lated to UCS ____________ _______________ No. specimens n = 115 n = 97 ___________________________________________________ Weibull fit A kW = 2.474 B kW =2.328 l = 89.657 l = 111.965 L = 3.5310-247 L = 1.5010-218 Gamma fit C kG = 4.595 D kG = 5.095 qG = 17.289 qG = 19.436 L = 3.4110-248 L = 6.7110-217 ___________________________________________________  Figure  SEQ Figure \* ARABIC 3. UCS histogram and applied fits (dash line Weibull and continuous line Gamma). Likelihood L of observed n independent specimen values x1, x2,& , xn, from the same rock type, in volume area of interest, with continuous PDF f(x; q), with parameters q, is defined with relation:  EMBED Equation.3  ( SEQ .eq \* MERGEFORMAT 4) Principle of maximum likelihood states that best parameters q are those which maximise probability of observing already observed UCS specimen values. ML parameters are those which satisfy relation:  EMBED Equation.3  ( SEQ .eq \* MERGEFORMAT 5) where * are parameter values which maximize the L function. If derivatives of the likelihood function exist then it can be done using relation:  EMBED Equation.3  ( SEQ .eq \* MERGEFORMAT 6) Solution of this equation will give ML values of q.  Figure  SEQ Figure \* ARABIC 4. Cumulative distribution of UCS (dots) and applied fits (dash line Weibull and continuous line Gamma). Likelihood ratio confidence bounds When some extent of UCS data are collected, then there is natural interest of interval estimation which would, with certain confidence level, "cover" true unknown UCS value, which is higher or lower than certain percent of all expected UCS specimens. UCS variable value which is higher than certain percent of all expected UCS samples is called percentile xF(x;) and is commonly represented with cumulative distribution function F(x;) (Figs  REF Fig_Cum_PLT \h 2,  REF Fig_Cum_UCS \h 4). For example we are interested in UCS percentile estimation which is higher than 95% (F(x;) = 0.95, denoted as UCS95) of all expected UCS values, with confidence level of 95%, for excavation equipment selection. Or, we are interested in UCS value estimation which is lower than 95% (UCS5) of all expected UCS values, with confidence level of 95%, for roof support or pillar design calculations. Estimated interval of possible percentile xF(x;) values is called Confidence Interval (CI) (Hudson 1997). As width of CI depends of confidence level , it is usual to denote it as CI. "Confidence bounds" are the lower and upper boundaries/values of a CI. Two-sided confidence bounds, define interval in which wanted percentile xF(x;) is likely to lie, while one-sided bounds defines the values from where a certain percentage of the population is either higher or lower. For two examples of interest from previous paragraph, determination of one-sided upper confidence bound estimation is required in former case and one-sided lower confidence bound estimation is required in latter case. Likelihood ratio (LR) test statistic with asymptotic Chi-square distribution c2 provides an approximate method for obtaining CI both for parameters as well as for variable estimation around certain percentile:  EMBED Equation.3  ( SEQ .eq \* MERGEFORMAT 7) where L() = the likelihood function, consisting the true unknown parameter list values , from the same rock type, in space volume of interest, L(*) = the likelihood function value calculated with parameters estimated by means of ML method, c2a;k = the chi-squared statistic with probability a, and k degrees of freedom. For large number of specimens with known parameter values , function -2[ln(L())  ln(L(*))] is approximately distributed as c2 random variable with one degree of freedom (k = 1). Chi-square statistics is calculated accordingly to purpose of estimation. When dealing with one set of specimen data and estimating CI, than k = 1. If comparing two data sets to determine whether the two sets are significantly different, than k = 2. Probability a equals confidence level  for two-sided, and  = (2  1) for one-sided confidence bounds estimation. At the prescribed  confidence level for parameters estimation, CI consist of all parameter values that would not be rejected at the (  1) significance level. The values of the parameters that satisfy Equation  REF JednabaChiSquare \h 7 will change based on the desired confidence level , and degrees of freedom k, but at a given value of  and k, there is only a certain region of values for  for which Equation  REF JednabaChiSquare \h 7 holds true. Likelihood Ratio Confidence Bounds on Parameters Parameters of estimated distribution fits and their confidence intervals are not of great interest for rock engineering purposes, but understanding procedure of calculation could be helpful when dealing with UCS CI. Since the values of the parameter estimates * have been calculated using ML methods, the only unknown term in Equation  REF JednabaChiSquare \h 7 is the L() term in the numerator of the ratio. For Weibull and Gamma distributions with two parameters, the values of these two parameters can be varied in order to satisfy Equation  REF JednabaChiSquare \h 7. Boundary of region which satisfies Equation  REF JednabaChiSquare \h 7 could be graphically represented by contour plot. Finding points of contour is an iterative process that requires setting the value of first parameter (e.g. kW) and calculating the appropriate value of other parameter (l), and vice versa. Note that c2 is calculated with degrees of freedom k = 1, as dealing with only one set of data. Likelihood Ratio Confidence Bounds on variables (UCS) For estimation of UCS confidence bounds trough contour plot with certain F(x;) value, unknown term L() in Equation  REF JednabaChiSquare \h 7 should be rewritten in manner that one parameter (e.g. kW) stays in likelihood function and other parameter (l) should be related trough desired F(x;) and UCS value. Finding points of contour is an iterative process that requires setting the value of first parameter (kW) and calculating the appropriate values of UCS for desired F(x;), or vice versa. Example of similar procedure for Weibull PDF is shown at "Likelihood Ratio Confidence Bounds" chapter (ReliaSoft Corporation, 2006). In this calculation procedure, set of values in list {kW, l, UCS} or {kG, G, UCS} are calculated together for one contour point of wanted CI. For one UCS value on higher or lower boundary of CI, only one set of parameters  is obtainable, while for UCS values inside of boundaries of CI two sets of variable values are obtainable. Figure  REF LRCBWeibull \h 5 shows one-sided confidence bounds for PLT and UCS data sets fitted to Weibull (upper) and Gamma (lower graph) distribution. One-sided CI95 are obtained for UCS95 (a = 0.90 and k = 1). Upper graph shows that PLTL = 130.86 MPa is Weibull estimation of one-sided lower bound of which 5% of all PLT correlated to UCS samples are higher, with confidence level of 95%. PLTU = 150.74 MPa presents Weibull estimation of one-sided upper bound of which 95% of all PLT correlated to UCS samples are lower, with confidence level of 95%. Similar statements are valid for UCS sample values with UCSL = 166.66 MPa and UCSU = 195.38 MPa. Lower graph in Figure  REF LRCBWeibull \h 5 shows one-sided confidence bounds for PLT and UCS data sets fitted to Gamma distribution. Values of one-sided confidence bounds for both distributions are given in Table  REF TabelaCI95 \h 2.  Figure  SEQ Figure \* ARABIC 5. UCS95 one-sided CI95 for two data sets. PLT samples correlated to UCS are presented with dash line and UCS samples with continuous line. Table  SEQ Table \* ARABIC 2. Weibull and Gamma estimation of UCS95 one-sided CI95 confidence bounds for two data sets. ________________________________________________ Data sets PLT corre- UCS lated to UCS __________ _______ MPa MPa ________________________________________________ Weibull fits A U 150.74 B U 195.38 L 130.86 L 166.66 Gamma fits C U 163.35 D U 199.96 L 136.57 L 164.98 ________________________________________________ U = one-sided upper bound, L = one-sided lower bound. Inspecting difference between two data sets From presented one-sided CI, differences between two estimated data sets are evident. 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Increasing confidence level is widening contour plot around ML parameter estimation (centre), thus probability for no-significant difference gets higher i.e. probability of intersection gets higher. Reason for significant difference, with 95% confidence level, lies in fact that specimens for different test methods were not obtained from same locations, and were not evenly distributed on site of interest.  Figure  SEQ Figure \* ARABIC 6. Comparing difference between two data sets. Number of specimens discuSSion What number of specimens n should be taken to obtain enough narrow and accourate CI? Intuitivly, as greater number of specimens, as narrower and accurate CI is. Simple relation between number of specimens and approximate mean value CI for Normaly distributed population is expressed with:  EMBED Equation.3  ( SEQ .eq \* MERGEFORMAT 8) where zd = represent the point on the standard Normal PDF such that the probability of observing a value greater than zd is equal to (1 - d) / 2 (for example, if d = 95%, than zd = 1.96 ), and s = standard deviation. Often in practice, estimation of UCS95 or any other UCS percentile estimation would be of more interest than mean value CI estimation. Rock strength population of interest, in reality has empirical distribution (Pauae 1993), which is neither Weibull, neither Gamma, but is approximately Weibull like, or Gamma like, or from group of any similar non-negative distribution like. Principally, rock UCS population distribution could not possibly be Normal nor of any left-tailed distribution type. Thus, UCS mean value, and standard deviation estimation should be understood only as collected specimens average and measure of spread. Gathering several specimens and averaging into samples is not appropriate if percentile estimation is of concern. Averaging would reduce spread of extreme specimen values, and distribution of samples would tend to look like Normal, which is expected outcome due to "Central limit theorem". In tribute to number of specimens discussion for UCS95 one-sided CI95 estimation, random sample strengths (n = 50, 100, 200 and 800 samples) which follow the Weibull and Gamma distributions were generated. Parameters of two Weibull and two Gamma distributions for random UCS generation are given in Table  REF TabelaParam \h  \* MERGEFORMAT 1. Confidence bounds of Weibull generated random specimens are only fitted to Weibull distribution and Gamma generated specimens are only fitted to Gamma PDF. For each independent group of specimens (16 groups) ML estimation of group parameters as well as UCS95 one-sided CI95 was obtained. Figure 7 shows four one-sided CI95 for different number of specimens generated with parameters A from Table 1. As greater number of specimens, as narrower CI95, and closer to true value, but true UCS95 is not always precisely targeted, owing that to allowance of prescribed confidence level and nature of generating random events. Values of obtained CI95 widths in relation to number of specimens are shown as hollow circles in Figure  REF Fig_o_UCS_CI95_to_No \h 8. Same procedure was done with parameters B, C and D. Widths of UCS95 one-sided CI95 for each independent group of specimens is graphically related to number of specimens in Figure  REF Fig_o_UCS_CI95_to_No \h 8. Two hatched areas are bounding spread of Weibull and Gamma confidence intervals. Note that, in general, for same number of specimens Weibull distribution gives narrower confidence interval, as happened for two real data sets from Figure  REF LRCBWeibull \h 5, where UCS95 confidence interval CI(A) < CI(C) and CI(B) < CI(D).  Figure  SEQ Figure \* ARABIC 7. Contour plots for UCS95 one-sided CI95. Random UCS values are generated from Weibull PDF with parameters A (Table  REF TabelaParam \h 1). Coordinate position of symbol + is placed on true (UCS95, kW ) value. Presented graph in Figure  REF Fig_o_UCS_CI95_to_No \h 8 could help when planning geotechnical exploration works, as proposition what number of specimens should be prescribed to satisfy stipulated width of UCS95 one-sided CI95. Specimen number of 50-100 is minimal when making evaluation of any confidence interval, which could be too wide for reasonable engineering decision making. Range of 100-200 specimens ought to give enough accurate confidence interval for rock excavation equipment selection, and probably for other engineering purposes. More than 200 specimens would give narrower CI, but from there on narrowing of CI would be slow with specimen number growth. Thus, with specimen number growth, economical benefits of cheaper tests like PLT or Schmidt hammer rise. Conclusion For any percentile estimation in geotechnical investigation works, each possible specimen should have equal chance of being included in analysis. This could be done by planning investigation works in manner that extracted test specimens are evenly distributed in the one rock type volume formation of interest, each representing one volume part. If many specimens are extracted from one volume part than one random should be chosen for further percentile analysis. Range of 100-200 specimens would be enough for percentile interval estimation. Specimens should be together presented with histogram, cumulative plot and best fitted to non-negative distribution type by means of ML method. Use of Weibull and Gamma two parameter distributions are appropriate. "Likelihood ratio confidence bounds" is recommended method when estimating one-sided or two-sided percentile confidence interval. Authors are encouraging engineers in effort to incorporate same method in estimation of other rock and geotechnical natural random properties (e.g. rock block volume distribution).  Figure  SEQ Figure \* ARABIC 8. Widths of UCS95 one-sided CI95 for 16 groups of random specimens in relation to number of specimens. Specimens generated from parameters A, B, C and D (Table  REF TabelaParam \h 1) are denoted as %, , % and % respectively. Confidence intervals of two real data sets from Figure  REF LRCBWeibull \h 5 are denoted as A, B, C and D. REFERENCES Bunning, K., Laai. S., Barbali, I. & Galjan, B. 2007. Engineer s response to Contractor s Claim. Institut graevinarstva Hrvaske, Split, unpubl. Hudson, J.A. & Harrison, J.P. 1997. Engineering rock mechanics an introduction to the principles. Amsterdam: Elsevier. Lloyd, D. K. & Lipow, M. 1962. Reliability: Management, Methods, and Mathematics. Englewood Cliffs, New Jersey: Prentice-Hall. Pauae, }. 1993. Uvod u matemati ku statistiku. Zagreb: `kolska knjiga. ReliaSoft Corporation: 2006, Life Data Analysis Reference, Tucson, ReliaSoft Publishing, online available: http://www.weibull.com/lifedatawebcontents.htm Rusnak, J. & Mark, C. 1999. Proc. 19th Int. Conference on Ground Control in Mining, Using the point load test to determine the uniaxial compressive strength of coal measure rock: 362-371. Thuro, K., Plinninger, R.J., Zh, S. & Schtz, S. 2001. Scale effects in rock strength properties. Part1: Unconfined compressive test and Brazilian test, ISRM Regional Symposium EUROCK 2001 Rock Mechanics  a challenge for Society. Srkk & Eloranta (eds.): 169-174. Vrkljan, I., `tambuk Cvitanovi, N., Bar ot, D. De man, A. 2007, Geotehni ki elaborat: Ispitivanje svojstava stijenske mase te analiza uzroka oateenja strojeva i njihovog slabog u inka pri iskopu pilota na lokaciji putni ke luke Gru~ u Dubrovniku. 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