围岩流变特性是影响巷道工程安全性和稳定性的关键因素之一,本构模型的研究是岩石流变力学理论研究中最基本最重要的组成部分,同时也是将试验研究成果应用于实际工程的必要环节。综合采用试验研究、理论分析和数值试验模拟分析等研究方法,对淮南矿业集团朱集煤矿千米深井巷道粉砂岩的流变力学特性和本构方程的构建进行了分析研究。在参考大量相关理论和试验资料的基础上,提出改进的与应力以及时间有关的指数函数形式的非线性黏塑性元件,将之与Burgers蠕变模型串联形成能够模拟岩石三阶段蠕变特性的六元件组合模型。对朱集煤矿深井巷道粉砂岩进行高围压状态下三轴蠕变试验,获得了不同应力水平下的蠕变曲线,依据测得的轴向蠕变曲线对所提出的六元件蠕变模型进行参数辨识,验证了模型的合理性。
Abstract
The rheological property of surrounding rock is one of the key factors affecting the safety and stability of tunnel engineering. Research of constitutive model is the most essential and important part of rock rheological mechanics theory and is a necessary step to apply the results to practical engineering. A research method integrating experimental investigation, theoretical analysis and numerical simulation is applied in this paper to analyze the rheological mechanics characteristic and the establishment of constitutive equations of the sandrock of kilometers deep shaft roadway in Huainan Mining Group’s Zhuji coal mine. Based on a large number of relevant theoretical and experimental data,a nonlinear creep model expressed as an exponential function of stress and time is constructed to combine with Burgers model. The new creep model of six elements demonstrates the three phrases of rock creep process and takes into consideration the accelerated creep characteristic. Triaxial compressive rheology test under high confining pressure condition was performed on sandstone taken from Zhuji deep mine. Creep parameters for the proposed model were identified from the test creep data to verify the rationality of the model.
关键词
粉砂岩 /
深井 /
非线性黏弹塑性 /
蠕变模型 /
三轴蠕变试验
Key words
sandstone /
deep mine /
nonlinear visco-elastic-plastic /
creep model /
triaxial creep test
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基金
河北省社会科学发展研究课题(2015031221,2015031233);河北省科技厅计划项目(164576110D);河北省重点学科技术经济及管理资助
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