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深埋绿泥石片岩现场工程和室内试验揭示绿泥石片岩在外荷载作用下存在弹塑性损伤耦合行为,考虑弹塑性损伤耦合建立力学模型是进行工程稳定性分析的基础。通过三轴试验对锦屏二级水电站绿泥石片岩的力学特性进行了研究,重点分析了围压对强度、变形、剪胀等非线性特征的影响;基于试验结果,根据绿泥石片岩在受压条件下表现出的塑性剪切和损伤弱化机制,提出了可以反映损伤弱化的损伤演化方程和反映塑性强化作用的加载方程和势函数,并提出适用的本构方程。室内三轴试验的模拟结果表明本文提出的力学模型与试验结果有较好的一致性,对类似深埋软岩地下工程的稳定性分析具有借鉴意义。
In-situ engineering and laboratory tests of deep-buried chlorite schist reveal the elasto-plastic damage coupling behavior of chlorite schist under the action of external loads. The establishment of mechanical model considering elastic-plastic damage coupling is the basis of engineering stability analysis. The triaxial test is used to study the mechanical properties of chlorite schist in the Jinping second stage hydropower station. The influence of confining pressure on nonlinear characteristics such as strength, deformation and dilatancy are analyzed emphatically. Based on the results of the tests, The plastic shear and damage weakened mechanisms under compressive conditions are presented. The damage evolution equations that can reflect the damage reduction and the loading and potential functions that reflect the plastic strengthening are presented. The constitutive equations are also presented. The simulation results of the indoor triaxial tests show that the proposed mechanical model is in good agreement with the experimental results, which is of great value to the stability analysis of the deep-buried soft rock underground engineering.