粉砂质泥岩峰前、峰后应力松弛特性试验研究

doi:10.13722/j.cnki.jrme.2014.1538

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Abstract The pre-peak and post-peak stress relaxation tests under triaxial compression were conducted on silty mudstone samples from Badong Formation strata in the Three Gorges Reservoir area. The pre-peak stress relaxation of rocks was divided into elastic and yield stages，and the post-peak stress relaxation of rocks was separated into strain softening and residual strength stages according to the test results. The variations of relaxation magnitude，degree，time and rate of rocks with time in four stages were analyzed，and the differences between pre-peak and post-peak stress relaxation characteristics of rocks were investigated in detail. A damage variable was proposed considering the deterioration of relaxation moduli of rocks with time. A new nonlinear damage model was established by introducing the damage variable into three-parameter generalized Kelvin model. The Levenberg-Marquardt algorithm was used to identify the pre-peak and post-peak model parameters of rocks. The variations of model parameters in four stages were analyzed，and the differences between pre-peak and post-peak model parameters were investigated according to the identification results. Finally，the mechanisms of pre-peak and post-peak stress relaxation behavior of rocks were discussed. The results show that：(1) through comparing four values of relaxation magnitude，degree，time and rate of rocks among different stages，it is found that four values of paramters in the strain softening stage are larger than those in three other stages，which should be paid more attention in rock engineering. (2) The post-peak values of G1，G2 and H1 in 5–9 strain levels are 1–53 percent of corresponding pre-peak values in first strain level. (3) The influence of post-peak rapture on the viscoelasticity of rocks is the largest，followed by the viscosity，and that on the instantaneous elasticity of rocks is the smallest. (4) The values of G1 and H1 decrease sharply in the strain softening stage，and the value of G2 drops dramatically in the yield stage. (5) The pre-peak and post-peak stress relaxation behavior of silty mudstone is mainly derived from the initiation and growth of microfissures and the initiation，growth and coalescence of macrocracks in rocks，respectively. Therefore，the mechanisms of pre-peak and post-peak stress relaxation behavior of rocks are different.

Key words： rock mechanics silty mudstone pre-peak post-peak stress relaxation mechanism

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	YU Huaichang
	DONG Jinyu
	LIU Handong
	HUANG Zhiquan
	SHI Guangcheng

Cite this article:

YU Huaichang,DONG Jinyu,LIU Handong, et al. Experimental study of pre-peak and post-peak stress relaxation behavior of silty mudstone[J]. , 2016, 35(S1): 2663-2672.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1538 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/2663

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