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砂岩在热湿循环作用下的卸荷损伤本构模型研究 被引量:1
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作者 张冰祎 王乐华 张胜佳 《水利水电技术》 CSCD 北大核心 2018年第12期162-168,共7页
针对在夏季高温多雨季节库岸边坡岩体的强度和稳定性下降问题,较多学者对干燥—饱水两种极端状态的循环作用进行了研究,这与实际情况相差较大。以三峡库区重庆段某典型边坡砂岩为研究对象,采用烘干—浸泡循环作用方式模拟岩石热湿循环过... 针对在夏季高温多雨季节库岸边坡岩体的强度和稳定性下降问题,较多学者对干燥—饱水两种极端状态的循环作用进行了研究,这与实际情况相差较大。以三峡库区重庆段某典型边坡砂岩为研究对象,采用烘干—浸泡循环作用方式模拟岩石热湿循环过程,在前期进行的热湿循环试验方案及数据分析的基础上,定量对砂岩的劣化程度进行划分,对热湿循环作用下砂岩的卸荷损伤本构模型进行研究。研究结果表明:热湿循环10次内砂岩各力学参数的劣化效应比较明显,10~50次逐渐减弱并趋于平缓;基于热湿循环和卸荷相互作用,建立了完整砂岩在不同热湿循环次数下的卸荷损伤模型并绘制模型曲线;经过验证,模型曲线与试验所得的三轴卸荷应力-应变曲线吻合度较高,认为该模型具有较好的适用性。 展开更多
关键词 热湿循环 峰值强度 抗剪强度参数 损伤 本构模型 滑坡地质灾害 岩体孔隙水压力 石三轴压缩试验
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Energy analysis of face stability of deep rock tunnels using nonlinear Hoek-Brown failure criterion 被引量:4
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作者 张佳华 李永鑫 许敬叔 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第8期3079-3086,共8页
The nonlinear Hoek-Brown failure criterion was introduced to limit analysis by applying the tangent method. Based on the failure mechanism of double-logarithmic spiral curves on the face of deep rock tunnels, the anal... The nonlinear Hoek-Brown failure criterion was introduced to limit analysis by applying the tangent method. Based on the failure mechanism of double-logarithmic spiral curves on the face of deep rock tunnels, the analytical solutions of collapse pressure were derived through utilizing the virtual power principle in the case of pore water, and the optimal solutions of collapse pressure were obtained by using the optimization programs of mathematical model with regard of a maximum problem. In comparison with existing research with the same parameters, the consistency of change rule shows the validity of the proposed method. Moreover, parametric study indicates that nonlinear Hoek-Brown failure criterion and pore water pressure have great influence on collapse pressure and failure shape of tunnel faces in deep rock masses, particularly when the surrounding rock is too weak or under the condition of great disturbance and abundant ground water, and in this case, supporting measures should be intensified so as to prevent the occurrence of collapse. 展开更多
关键词 tunnel face limit analysis failure criterion pore water pressure collapse pressure
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