土质边坡稳定性的能量方法研究

STUDY ON ENERGY METHOD OF SOIL SLOPE STABILITY

安全系数作为评价边坡稳定性的指标,其准确性和适用性是非常重要的。一般来说,土体强度是影响土质边坡稳定性的主要因素。以能量法为基础,根据内能耗散功率大于外力所做功率的自然边坡稳定性判定方法,可以较为方便地运用能量法推导内能耗散功率及外力所做功率的计算公式,通过内能耗散功率与外荷载所做功率比值来判定斜坡稳定性。并通过两个算例验证该算法的可靠性,计算结果与其他极限平衡法所判定结果相近。本文方法使用的参数值较易获得,计算结果无需折减,而且在考虑极限平衡关系的条件下,同时还考虑了土体的非线性应力-应变关系,使得稳定性分析从理论上来说就更加贴切实际。该方法计算简单,且不存在任何土条间力的假定,但此方法在处理复杂边坡的细微结构上还有待进一步的提高。

Safety factors as an indicator of slope stability,its accuracy and applicability is very important.In general,soil strength is a major factor affecting the stability of soil slopes.Based on the energy method,according to the method of determining the natural slope stability of the power dissipated by the external energy,it is more convenient to use the energy method to derive the power dissipation power and the calculation formula of the external power.Energy dissipation power and external load power ratio to determine the slope stability.The reliability of the algorithm is verified by two examples.The results are similar to those obtained by other limit equilibrium methods.The parameters of this method are easier to obtain,the calculation results need not be reduced,and also consider the nonlinear stress-strain relationship of the soil under the condition of the ultimate equilibrium relation,so that the stability analysis is theoretically more practical.This method is simple to calculate and does not have any assumptions about the intercross force,but this method needs to be further improved in dealing with the fine structure of complex slope.