降雨条件下饱和-非饱和土坡的渗流分析  

Seepage analysis of saturated-unsaturated slope under rainfall

作　　者：李萍[1] 张琦[1] 陈小念[2] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]苏州工业园区职业技术学院建筑工程系,江苏苏州215021

出　　处：《兰州理工大学学报》2007年第6期115-118,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省建设科技攻关基金(JK-2004-18)

摘　　要：运用饱和-非饱和渗流有限元法模拟降雨条件下饱和-非饱和土坡暂态渗流场的变化情况,分析降雨强度、降雨历时以及土壤饱和渗透系数等参数对非饱和土坡基质吸力的影响.分析结果表明:当饱和渗透系数较大、降雨强度小时,降雨入渗充分,孔隙水压力梯度变化大;饱和渗透性小时,降雨影响的深度变浅,基质吸力逐渐丧失;降雨初期,孔隙水压力梯度变化最明显,在降雨8 h之后,基质吸力完全丧失,对于土坡稳定安全不利.Based on the finite element method of the saturated-unsaturated seepage, the variation of transient seepage field of saturated-unsaturated slope was simulated in the case of rainfall, and the influence of rainfall intensity, rainfall duration and saturation permeability coefficient on the matric suction of the unsaturated slope was also analyzed. The analysis results indicated that, when saturation permeability coefficient was greater and the rainfall intensity was small, the rainfall infiltration would be sufficient and the grads of pore water pressure would vary notably. On the contrary, when saturation permeability coefficient was small, the depth of rainfall influence area would be shallow and the matric suction would gradually vanish. At the initial stage of the rainfall, there was a most notable variation of the grads of pore water pressure. Eight hours later, the matric suction would vanish entirely, being very harmful to the stability of slope.

关 键 词：降雨 饱和-非饱和 渗流 基质吸力 

分 类 号：TU411.4[建筑科学—岩土工程]