降雨入渗通道对黄土开挖边坡影响  

Impact of excavation loess slope's rainfall infiltration channel

作　　者：王新刚[1] 胡斌[1] 余宏明[1] 连宝琴[2] 

机构地区：[1]中国地质大学工程学院,湖北武汉430074 [2]广州城建职业学院建筑工程系,广东广州510925

出　　处：《辽宁工程技术大学学报（自然科学版）》2013年第9期1178-1181,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金资助项目(41172281)

摘　　要：针对在降雨作用下黄土节理将逐步发育成大的入渗通道,加剧黄土开挖边坡的破坏的问题.通过野外现场地质调查,统计黄土开挖边坡中的黄土节理裂隙、入渗贯穿通道分布状况,得出不同开挖边坡高度的入渗通道间距与开挖边坡高度高斯拟合关系式;根据入渗通道分布关系式,概化建立降雨入渗通道的演化数值分析模型,并分析了40 mm/d、80 mm/d、120 mm/d 3种降雨工况下降雨24 h的入渗通道演化过程及开挖边坡破坏程度.研究结果表明:在降雨作用下入渗通道在坡高60 m左右破坏严重,坡高高于此高度应注意入渗通道的剧烈扩展并加以防治.According to the loess joints will gradually develop into a big infiltration channels under the action of rainfall and the destruction of loess slope will be increased.Different excavation slope height of infiltration channel spacing and excavation slope height Gaussian fitting relation are concluded through the field geological survey,loess slope joint fissures and infiltration through channel's distribution statistics; The rainfall infiltration channel evolution's numerical analysis generalized model be establish according to the infiltration channel distribution relation,the rainfall infiltration channel evolution process and excavation slope damage be analyses under three rainfall condition 40mm/day,80mm/day,120mm/day.The results prove that the rainfall infiltration channel will be destroyed under the action of rainfall with the slope high of about 60m,which requires extra attention to the severe expansion of infiltration channel,and precautions need to be taken while the slope is higher than 60m.

关 键 词：入渗通道 开挖边坡 降雨作用 黄土节理 地质调查 演化过程 数值分析模型 FLAC3D 

分 类 号：TU444[建筑科学—岩土工程]