强度折减法在评价铁路隧道围岩稳定性问题中的应用探讨

Study on Application of Strength Reduction Method in Assessment of Surrounding Rock Stability problem in Railway Tunnel

强度折减法通过对岩土体强度参数进行不断折减,最终使岩土体处于极限状态,并求得稳定安全系数。强度折减法首先在边坡稳定分析中得到了广泛应用。近年来,强度折减法在隧道工程中也逐渐被引入应用研究。通过建立数值计算模型,通过分析不同级别围岩在不同强度折减系数条件下铁路隧道掌子面拱顶沉降和水平位移变化得到其稳定性安全系数,对采用强度折减法进行铁路隧道围岩稳定性评价的应用进行了探讨,可为以后进行铁路隧道围岩稳定性评价提供了新思路,新方法。

Strength reduction method is a way in which strength parameters of rock and soil are reduced continuously and make rock and soil reach the ultimate limit state and get the safety factor of stability. Strength reduction method is widely used in slope stability analysis. In recent years, the strength reduction method has also been applied in some tunnel engineering.Analyze the change of vault settlement, extrusion deformation, and horizontal displacement of railway tunnel face in surrounding rock of different level and different strength reduction factor, discuss the application of strength reduction method in assessment of stability problem in railway tunnel by numerical model. It gives a new idea and a new way to estimate the stability of railway tunnel in the future.