Abstract：In order to eliminate the measurement error of CSIRO method due to nonlinear characteristics of deep rock mass，a nonlinear hyperbolic model with physical mearning parameters，describing the relationship between the mean stress with the bulk modulus and the shear modulus，is put forward through triaxial compression test. A set of high-pressure biaxial loading test device is developed to simulate core high stress relief，and high-level biaxial loading and unloading test is performed. The nonlinear hyperbolic model is applied to CSIRO characteristic equations of the nonlinear relationship between the mean stress and the strain. Compared with the traditional linear method，the proposed nonlinear method has a higher precision. A parameter，k1，which is not sensitive to the volume modulus and the shear modulus and can be determined by piecewise linear fitting，is introduced to eliminate the calculation error caused by epoxy resin glue.
乔 兰，张亦海，李 远，付双双. 深部花岗岩CSIRO地应力测量中高压双轴加卸载试验及非线弹性分析模型[J]. 岩石力学与工程学报, 2019, 38(1): 40-48.
QIAO Lan，ZHANG Yihai，LI Yuan，FU Shuangshuang. A non-linear elastic model and high-level biaxial loading and unloading test for CSIRO in-situ stress measurement in deep granite. , 2019, 38(1): 40-48.
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2019, Vol. 38 
