摘要
以极限分析上限法为基础,通过建立阶梯式边坡三维模型,考虑牛角状对数螺旋圆锥体滑动面,对土体重力产生的外功率以及滑动面上产生的内能耗散率进行计算,得到了安全系数Fs的显性表达式。通过编程的方式进行优化寻求所有可能结果中的最低解。通过算例计算以及参数分析,考虑阶梯式边坡台阶宽度参数、高度参数、内摩擦角、上下层边坡坡角、土体非均质性与各向异性等几何参数和土体参数,计算分析了阶梯式边坡在不同宽度条件下的安全系数变化规律,分析结果对于三维阶梯式边坡的稳定性评估和设计施工具有一定参考价值。
Based on the upper-bound limit analysis method,the three-dimensional model of the stepped slope is established,and the hom-shaped logarithmic spiral cone sliding surface is considered to calculate the external work rate generated by the soil weight and the internal energy dissipation rate generated on the sliding surface.An explicit expression of the safety factor FS is obtained.Programming is used to optimally seek the lowest solution of all possible results.Through calculation of the example and parameter analysis,the geometric parameters and soil parameters such as step width parameter,height parameter,internal friction angle,slope angle,nonhomogeneous and anisotropy,are considered.The safety factors of stepped slope under different width conditions are analyzed.The results can provide reference for the stability assessment of stepped slopes in practical engineering.
作者
刘芳
LIU Fang(Department of Architecture and Civil Engineering,Guangxi Vocational Technical College of Communications,Nanning 530012,China)
出处
《结构工程师》
北大核心
2019年第6期212-219,共8页
Structural Engineers
关键词
极限分析上限法
阶梯式边坡
对数螺旋圆锥体
安全系数
upper-bound limit analysis method
stepped slope
logarithmic spiral cone
safety factor
