岩体非线性蠕变模型.docVIP

节理岩体黏弹塑性流变模型研究(武汉大学 水资源与水电工程科学国家重点实验室，湖北 武汉 430072) 摘要：对于调节岩石流变破坏过程的作用，显示模型模拟脆性–延性流变破坏的特点。与大理岩单轴压缩蠕变破坏试验进行对比，结果表明提出的模型与试验结果吻合很好，可以很好地反映岩石蠕变破坏过程。进一步对节理面的黏弹塑性流变破坏模型进行讨论，并与灌水泥浆大理岩节理的剪切蠕变试验对比，结果表明模型也能很好地反映节理面蠕变破坏特点。最后，将建立的流变破坏模型应用于大岗山引水隧洞的流变破坏分析，确定其流变破坏过程和流变破坏时间，可为进一步喷锚支护设计提供依据。针对岩石和节理面所建立的黏弹塑性流变破坏模型概念明确，能正确模拟岩石和节理面的流变破坏过程和判断破坏时间，且参数为常规试验所得，将具有良好的应用前景。 关键词：强度；文献标识码：A文章编号：1000–6915(201)02–0231–08 RESEARCH ON VISCO-ELASTOPLASTIC RHEOLOGICAL FAILURE MODEL OF JOINTED ROCK MASS SHE Chengxue，SUN Futing (State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China) Abstract：The visco-elastoplastic rheological failure model for rock block and joint is studied. A new concept of rheological instantaneous strength is firstly proposed；and on the basis，the nonlinear visco-plastic rheological failure model for rock and joint is established. Taking the uniaxial compression creep test for example，the visco-plastic deformation characteristics described by the new model is discussed. Then，the complete visco- elastoplastic rheological failure model for rock is established；and the creep as well as the relaxation characters of rock described by the model are analyzed. The influence of the parameteron rheological deformation and failure pattern is studied showing that the model can well reflect the brittle-ductile failure pattern of rock. By comparison with the uniaxial creep test of marble，it is found that the test and calculation by the model are coincident well，especially in the failure stage. Furthermore，the complete visco-elastoplastic rheological failure model for joint is also discussed. The calculation of creep failure process for a grouted joint is demonstrated to be well coincident with the test results. Finally，the new model is applied to the rheological failure analysis of the access tunnel of the Dagangshan hydropower station. The failure process is well modeled and the failure time is successfully forecasted，wh