【摘要】 结合深圳莲盐高速公路隧道围岩中的II～V级凝灰熔岩进行了双轴剪切流变试验,通过试验结果分析和模型辨识,得到不同围岩级别凝灰熔岩的剪切流变规律和流变模型。II,III级围岩采用广义Kelvin模型,IV级围岩采用伯格斯模型,V级凝灰熔岩采用非线性流变模型,可以较好地模拟围岩的流变特性;II,III,IV级围岩主要以脆性破坏为主,V级围岩则以塑性破坏为主;试验还得到了II～V级凝灰熔岩的剪切流变参数;并通过对试验结果与不同级别围岩剪切流变模型的对比分析,进一步验证了流变模型的合理性。更多还原

【Abstract】 The biaxial shear rheological experiment on tufflava with grades II–V is carried out with tunnel surrounding rock of Shenzhen Lianyan Highway.Through analysis of test results and model identification,the shear rheological law of surrounding rocks different grades is discussed;and the rheological models are proposed.II and III grades of surrounding rocks can be simulated reasonably with generalized Kelvin model,as grade IV with Burgers model and V with nonlinear rheology model.The failure behaviors of surrounding rock with grades II and III are brittle fracture;and the failure behaviors of grades IV and V are plastic yielded.Rheological model parameters of surrounding rocks with different grades are gotten;besides,the comparison between the shear rheology model and experimental results shows that the proposed shear rheology model is reasonable.更多还原