摘要
为了研究阜新恒大煤矿开采过程中围岩呈现出明显的流变性质,采用MTS815.02试验机开展不同围压作用下的蠕变试验.考虑时间与应力对蠕变参数和力学参数的影响,通过引入过应力差和时间乘积的概念,构建考虑时效性和应力状态的损伤模型,进而在西原体模型的基础上建立一个新型的非定常蠕变模型,结合砂岩不同围压作用下的蠕变试验结果,对模型中的参数进行反演,将得到的参数代入模型中与试验曲线进行对比.结果表明:蠕变试验曲线与模型曲线具有较高的拟合度,说明该模型不仅克服了传统西原体难以描述加速蠕变特性的缺点,也验证了建立的非定常非线性蠕变模型的正确性与合理性.
In order to study the obvious rheological properties of the surrounding rock during the mining process of Fuxin Hengda coal mine,the creep test under different confining pressures was carried out by using the MTS815.02 test machine.Considering the influence of time and stress on creep parameters and mechanical parameters,a damage model considering time-dependent and stress states was established by introducing the concept of over-stress difference and time product.Based on the Nishihara model,a new unsteady creep model was established.Combined with the experimental results of creep under different confining pressures of sandstone,the parameters in the model were inverted.The parameters obtained were substituted into the model for comparison with the test curves.The results show that the creep test curves has a high degree of fit with the model curves.It is shown that the model not only overcomes the shortcomings of the traditional Nishihara model which is difficult to describe the accelerated creep characteristics,but also the correctness and rationality of the established unsteady nonlinear creep model are verified.
作者
张树光
刘文博
陈雷
孙博一
ZHANG Shuguang;LIU Wenbo;CHEN Lei;SUN Boyi(School of Civil Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,China;School of Civil and Architectural Engineering,Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin,Guangxi 541004,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2019年第5期993-1002,共10页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51274109)
关键词
非定常
过应力差
蠕变
西原模型
非线性
unsteady
overstress difference
creep
Nishihara model
nonlinear
