考虑膨胀力与孔隙性的膨胀土边坡稳定性

Expansive Soil Slope Stability Considering High-porosity and Expansive Force

研究了膨胀土边坡的稳定性分析。相对于普通土体,膨胀土的多孔隙性以及膨胀性对其边坡的稳定性有重要的影响。由于以上两点原因,膨胀土边坡常发生浅层滑动。为了分析其浅层稳定性,利用极限分析原理,建立了圆弧状的破坏机构,将膨胀力视为外力作用与滑动体上。在计算其内外功率的基础上,提出了浅层稳定性的问题的数学表达式。经过计算,结果表明其稳定性问题受孔隙性的影响较大。

The stability problem of expansive soil slope is analyzed.Related to normal soil,the high-porosity and expansibility have large influence on the slope stability.For the two reasons,the sallow sliding often occurs in expansive soil slope.Thus,by limit analysis upper bound theorem,the circle failure mechanism was built.The expansive force was considered as external force acting on the sliding mass.Based on the internal and external work rate,the formulation of sallow stability was proposed.The result shows that the high-porosity is more effective to the stability.