基于毕肖普法和强度折减法对边坡的研究

Analysis of Slope Stability Based on Bishop Method and Strength Reduction Method

针对皖南某四级公路边坡稳定性问题,使用简化毕肖普法和数值模拟法计算边坡稳定性系数。运用Midas/GTS选取该边坡的最不利处进行三维建模,选用强度折减法理论(SRM)对自然状态下边坡的稳定性进行分析,得出边坡的稳定性系数、总位移云图、最大剪应变在边坡中的分布状况。通过比较分析,简化毕肖普法和数值模拟得到的安全系数基本一致,证明了Midas/GTS软件的可靠性和实用性。计算和分析表明,该斜坡在自然条件下是不稳定的,需要进行加固。在该工程中,使用锚杆和喷射混凝土进行加固。支护后,稳定性系数明显提高,支护效果显著。

In view of the slope stability problem of a four-level highway in southern Anhui,simplified bishop method and numerical simulation method are used to calculate the slope stability coefficient.Midas/GTS is used to select the most disadvantaged parts of the slope for three-dimensional modeling.The strength reduction theory(SRM)is used to analyze the stability of the slope under the natural state,and the slope stability coefficient,total displacement cloud map and maximum shear strain distribution in the slope are obtained.Through comparative analysis,the safety coefficient obtained by simplified bishop method and numerical simulation are basically consistent,which proves the reliability and practicability of Midas/GTS software.The calculation and analysis show that the slope is unstable under natural conditions and needs to be reinforced.Anchor rods and sprayed concrete are used for reinforcement in the engineering.After supporting,the stability coefficient is obviously improved,and the supporting effect is remarkable.