Study on In-situ Direct Shear Tests and Shear Parameters of Structural Planes of Semi-diagenetic Rocks
Asa class of speciality geotechnical rocks,the engineering properties of semi-diagenetic rocks are greatly influenced by the structur-al planes of the rock body,so it is very important to determine the shear strength parameters of the structural planes.In this paper,probabilistic statistical analysis is used to estimate the shear strength parameters based on the results of direct shear tests on semi-diagenetic rocks,and the 95%prediction band and 95%confidence band of the M-C criterion model and the B-B criterion model were fitted and evaluated.The results show that the 95%confidence band of the B-B criterion model is narrower than that of the M-C criterion,and the reliability of the parameter estimation is higher,especially at low normal stress levels,the B-B criterion model is significantly better than the M-C criterion model,and its shear strength parameters are more accurate.
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