土体边坡稳定性分析的统一强度理论解

Study on the Soil Slope Stability Based on the Unified Strength Theory

基于莫尔-库仑破坏准则得到的边坡稳定分析,与实际结果有一定的差距;而统一强度理论,考虑了中间主应力的影响,已较广泛运用于工程实践当中,取得了较好的效果,并得到了很好的评价。因此本文利用统一强度理论,采用边坡稳定分析中使用的毕肖普法的基本假定,建立了稳定安全系数的统一表达式。利用此解可以更加合理地分析土质边坡的稳定性,并且能充分发挥材料自身的强度潜力,对实际工程具有重要意义。计算结果表明,中间主应力对边坡的稳定安全系数有较大的影响,随着中间主应力的影响增加,安全系数也相应的增加。本文对土质边坡稳定分析和工程应用有很好的参考价值。

The slice methods based on Mohr-Coulomb strength criterion did not consider the effect of intermediate principal stress on the slope stability,so the discrepancy between theoretical results and those from experimental data is produced.Based on the hypothesis of the Bishop slice methods,the safety coefficient from unified strength theory is determined.It is shown from the numerical results that intermediate principal stress greatly affects the stability of the soil slope,and the safety coefficient increases with an increasing in the influence coefficient b.The corresponding solutions can be rationally applied to analyze the soil slope stability.The bearing capacity of soil material can be improved,which is of important significance for actual engineering work.