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围岩安全性评价是隧道稳定性分析的重要方面,建立在复杂应力状态下的强度理论能够较好地反映岩石破坏的机理,但无法定量地反映围岩的连续变化情况;研究在一定前提下导出与等效面积Drucker-Prager(D-P)屈服准则相匹配的围岩屈服接近度公式,并通过ANSYS二次开发验证了方法的合理性,可以对围岩危险程度做出定量评价;该方法简单实用,可为隧道稳定性分析与安全评价提供量化参考依据。
The evaluation of surrounding rock safety is an important aspect in the analysis of tunnel stability. The strength theory established under complex stress state can well reflect the mechanism of rock failure, but can not quantitatively reflect the continuous variation of surrounding rock. The formula of yielding proximity of surrounding rock is derived which matches the Drucker-Prager (DP) yield criterion of equivalent area, and the rationality of the method is verified by secondary development of ANSYS. The method can be used to quantitatively evaluate the dangerous degree of surrounding rock. The method is simple Practical, which can provide quantitative reference for tunnel stability analysis and safety evaluation.