Experimental and theoretical study on creep behaviors of sandstone with different moisture contents based on modified Nishihara model
SUN Xiaoming1，2，MIAO Chengyu1，2，JIANG Ming1，2，ZHANG Yong1，2，YANG Liu1，2，GUO Bo1，2
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Beijing 100083，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China)
Abstract：In order to study the influence of the long-term strength change on the stability of the surrounding rock in deep roadways under the action of groundwater. The sandstone in Wanfu Coal Mine was taken as the main research object，and uniaxial compression test and uniaxial creep test were carried out with different moisture contents. It is found that the water content has an obvious softening effect on the rock strength and long-term strength. According to the viscoelastic strain law of isochronal creep curve，a viscoelastic modulus was proposed，and the nonlinear softening laws of the viscoelastic modulus and the elastic modulus with the water content were obtained. A new nonlinear viscous dashpot element that can describe the accelerated creep behavior was proposed，by which an improved Nishihara model was developed based on the combination of the damage theory and the experimental results. The model was used to identify the parameters of the creep experiment results，and it is shown that the model has a good fitting effect on the experimental results，which means the model can better describe the mechanical behavior of each stage of creep. At the same time，it is found that the damage creep model parameters ，， have little difference under the same stress，and each parameter is affected by the creep stress. Specifically，has a linear relationship with ，while and have a negative exponential relationship with . Therefore，the creep state of rock can be reasonably analyzed according to the moisture content and different stress levels. Combined with the new long-term creep strength discrimination method，the developed model can provide a basis for the long-term stable use of roadways and the advance prediction of creep failure of roadways.
孙晓明1，2，缪澄宇1，2，姜铭1，2，张勇1，2，杨柳1，2，郭波1，2. 基于改进西原模型的不同含水率砂岩蠕变实验及理论研究[J]. 岩石力学与工程学报, 2021, 40(12): 2411-2420.
SUN Xiaoming1，2，MIAO Chengyu1，2，JIANG Ming1，2，ZHANG Yong1，2，YANG Liu1，2，GUO Bo1，2. Experimental and theoretical study on creep behaviors of sandstone with different moisture contents based on modified Nishihara model. , 2021, 40(12): 2411-2420.
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2021, Vol. 40 
