摘要
在土坡稳定分析的极限平衡法中,采用非饱和非稳定渗流的分析方法,对土体的非饱和特性对土体抗剪强度的影响进行了分析,同时分析了浸润线的位置及其上下土体重度的确定等因素对土坡安全系数计算的影响.结果表明,由于非饱和区的存在,即使不考虑基质吸力的影响,土坡的安全系数仍有所提高;如果进一步考虑基质吸力,土坡的安全系数将会进一步提高;并且,合理确定土体中孔隙水压力和饱和度的分布,对计算结果非常重要.
The analysis method of transient-unsaturated seepage is adopted in limit equilibrium method and the influence of unsaturated property of soils on shear strength is also analyzed. The paper also presents a study of some factors that influence the calculation of safety factor of soil slopes such as the determination of the position of phreatic line and the unit weight of soil above it. The results show that the safety factor of soil slopes increases because of the existence of unsaturated zone, even if the influ- ence of matric suction is not considered. If the matric suction is considered, the safety factor of soil slope increases correspondingly. The importance of the rational determination of distribution of pore pressure and saturation of soils on the results is also discussed.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第3期304-309,共6页
Journal of Tongji University:Natural Science
基金
国家自然科学基金资助项目(50579051)
中国地质大学科学技术基金资助项目(200704)
关键词
非饱和土
非稳定渗流
基质吸力
土坡稳定分析
unsaturated soil
transient seepage
matric suction
slope stability analysis
