基于COMSOL Mutiphysics的降雨强度对土石坝稳定性影响分析  

Analysis of the Impact of Rainfall on the Stability of Earth Rock Dams Based on COMSOL Mutiphysics

作　　者：彭莉 李惠敏 PENG Li;LI Hui-min(Wuhan Ruishan Zhishui Science and Technology Research Co.Ltd.,Wuhan 430010,China;Huaian Water Conservancy Survey and Design Research Institute Co.Ltd.,Luojia Branch,Wuhan 430323,China)

机构地区：[1]武汉睿山智水科学技术研究有限责任公司,武汉430010 [2]淮安市水利勘测设计研究院有限公司珞珈分公司,武汉430323

出　　处：《水利科技与经济》2025年第4期73-77,共5页Water Conservancy Science and Technology and Economy

摘　　要：降雨是影响土石坝稳定性的重要因素之一,降雨入渗导致土石坝的孔隙水压力增大,基质吸力减小、地下水水位抬升以及岩土体抗剪强度降低,均对土石坝稳定性产生不利影响。研究采用COMSOL Multiphysics数值模拟软件,基于饱和-非饱和渗流理论,对土石坝进行降雨入渗分析,并对比3种不同降雨强度的安全系数及位移变化。结果表明:(1)短时间内的强降雨对土石坝的影响大于长时间内的小降雨;(2)土石坝最大位移在接近安全系数时发生突变,最大位移处对应了土石坝整体的安全系数值;(3)无降雨的天然土石坝安全系数为1.61,对应的最大位移为59mm;工况1的安全系数为1.59,对应的最大位移为83.4mm;工况2的安全系数为1.56,对应的最大位移为84.1mm;工况3的安全系数为1.52,对应的最大位移为83.1mm。Rainfall is one of the important factors affecting the stability of earth rock dams,rainfall infiltration leads to an increase in the pore water pressure of slopes,a decrease in matrix suction,groundwater level elevation and geotechnical body shear strength reduction,all of which have a negative impact on the stability of earth rock dams.Therefore,this paper adopts COMSOL Multiphysics numerical simulation software,based on saturated-unsaturated seepage theory,to analyze the rainfall infiltration of earth rock dams,and compares the safety coefficients and displacement changes of three different rainfall intensities.The results show that:①the effect of heavy rainfall in a short period of time on the earth rock dam is greater than that of small rainfall in a long period of time;②the maximum displacement of the earth rock dam undergoes a sudden change when approaching the factor of safety,and the place of the maximum displacement corresponds to the value of the factor of safety of the earth rock dam as a whole;③the factor of safety of the natural earth rock dam with no rainfall is 1.61,which corresponds to a maximum displacement of 59mm,and the safety factor for Case 1 is 1.59,which corresponds to a maximum displacement of 83.4mm;the safety factor for Case 2 is 1.56,corresponding to a maximum displacement of 84.1mm,and the safety factor for Case 3 is 1.52,corresponding to a maximum displacement of 83.1mm.

关 键 词：降雨 土石坝稳定性 COMSOL Mutiphysics 安全系数 

分 类 号：TU432[建筑科学—岩土工程]