Engineering Rock Mechanics
168 Anisotropy and inhomogeneity STATISTICS ftx)l A‘ Probability ~ function X GEOSTATISTICS Semi-variogram I I) ah SAMPLED DATA: ...
Ramifications for analysis 169 The semi-variogram illustrated in the top right of Fig. 10.3 is derived from the equation where y ...
170 Anisotropy and inhomogeneity Unifmdy rlodDlll orisnutioor Ncgauve cxpocn(i.l CYC lengths Isotropic linearly increasing joint ...
Ramifications for analysis 171 Figure 10.5 Use of the classical Kirsch solution for plane strain stresses around a circular open ...
172 Anisofropy and inhomogeneify ,/Ipn Figure 10.6 Schematic of a hybrid computational scheme for excavation and support design ...
Testing tech n iques 77 In this chapter, the first two sections concern the practical aspects of obtaining access to the rock ma ...
174 Testing techniques .. , ..:. ,Reference mark Figure 11.1 Access to the rock mass via a rock exposure (top), borehole core (m ...
Tailoring testing to engineering requirements 1 75 engineering objective. In Fig. 11.2, there is a histogram of the rock paramet ...
176 Testing techniques performed quickly, but may not determine an intrinsic property-the point load test and Schmidt hammer reb ...
Tests on intact rock 177 Figure 11.4 Automated discontinuity location measuring equipment (after Nordqvist, 1984). 11.3 Tests on ...
178 Testing techniques Figure 11.5 The Schmidt hammer and point load test equipment. ...
Tests on intact rock 179 discontinuity surfaces, the condition of the surfaces is of particular importance. In Fig. 11.6, we sho ...
180 Testing techniques I I I , 1 I 10 20 30 40 i 50 (^10) L (^20) I (^30) I 40 ‘50 I 60 20 30 40 50 Bo .a 20 30 40 50 80 v Schmi ...
Tests on discontinuities 1 8 1 strength is predicted from a calibration curve, then we should be grateful as engineers that the ...
182 Testing techniques Table 11.1 ISM and ASTM published testing methods (as at 1992) ISRM TEST METHODS klm~cDcsaiptioa Hardness ...
Jests on discontinuities 183 P H 0 T O G R A P H 0 F C 0 R E Figure 11.7 Example of a borehole core logging sheet. ...
184 Testing techniques From the record, and the overview statistics, one can determine the discontinuity frequency (and hence me ...
Tests on discontinuities 185 Figure 11.8 The tilt test for measuring the angle of friction between discontinuity surfaces (after ...
186 Testing techniques and rates of shearing, allowing a wide range of parameters to be obtained (c, 4, curvature of the failure ...
Tests on rock masses 187 Figure 11.11 TerraTek servo-controlled triaxial testing machine at Imperial College as used for thermo- ...
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