基于JRC-JCS模型的屈服接近度及地下工程围岩稳定性分析方法

推导出JRC-JCS非线性模型下屈服接近度的计算公式，采用数值方法编制JRC-JCS模型下屈服接近度的计算程序，并对比该程序的分析结果与FLAC3D所得的结果，探讨各个参数对屈服接近度的影响。分析表明，屈服接近度 =1的结果与FLAC3D计算的塑性区分布范围表征的结果一致，验证了计算程序的正确性和基于屈服接近度分析获得的结果能反映非塑性区岩体的危险程度，较塑性区分布判别方法更加合理。随着节理粗糙度系数 和为岩体压缩强度 的增大，岩体屈服接近度均逐渐减小， 与 的关系呈线性特征， 与 的关系呈非线性指数特征。

Yielding approach index based on JRC-JCS model and stability analysis method of surrounding rock mass in underground engineering

Derivation of the yield approach index(YAI) formula under JRC-JCS nonlinear model is deducted,the calculation method for the yield approach index under JRC-JCS nonlinear model is programmed;and its results are compared with the results of FLAC3D,the effects of various parameters on the yielding approach index are analyzed to obtain that the result from yield approach index YAI JJ=1 is the same with that of plastic zone distribution of FLAC3D calculation results;so that it is verified the program and results from the yield approach index can reflect the damage degree of non-plastic area of rock mass,and is better than the estimation method of plastic zone distribution.With the increase of joint roughness coefficient J RCand rock mass compressive strength J CS,the yield approach index of rock mass decreases gradually;the relation between YAI JJand J RCis linear feature;and the relation between YAI JJand J CSis exponential nonlinear feature.