摘要
初步建立非饱和土边坡计算结果和工程安全的关系,提出对于一个给定的非饱和土边坡滑裂面,滑裂面安全的条件是最危险状态时对应的最小安全系数不小于允许安全系数。通过引入安全系数比,推导基于安全系数比的非饱和土边坡普遍条分法、非饱和土瑞典条分法和Bishop条分法,建立不同状态下的各部分计算参数和最小安全系数的关系。给出孔隙气压力等于0、饱和状态等特殊形式,在一定情况下可简化边坡安全系数的计算方式。通过具体算例,对安全系数比和重度对最小安全系数的影响进行分析。安全系数比对最小安全系数有着较大影响,随着安全系数比的增大,非饱和土的最小安全系数减少,重度对非饱和土最小安全系数影响不大。
The relationship between the factor of safety of unsaturated soils slope and the stability is proposed for a given unsaturated soil slice. If the minimum factor of safety is greater than or equals to the allowable factor of safety, the slice is safe. The general limit equilibrium methods for stability analysis, Swedish slice method and Bishop method, are conducted based on the ratio of factor of safety and the improved Mohr-Coulomb failure theory. Several special formulas are achieved when the pore pressure is 0. The minimum factor of safety of an unsaturated soil slope is analyzed with the changes of different parameters. Some results show that with the increase of the ratio of factor of safety, the minimum factor of safety significantly decreases, yet the density has little effect on the minimum factor of safety.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2009年第A01期3250-3256,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
非饱和土
边坡稳定
吸力
最小安全系数
安全系数比
soil mechanics
unsaturated soils
slope stability
suction
the minimum factor of safety
ratio of factor of safety
