节理控制的降雨入渗通道对黄土开挖边坡稳定性的影响  

Impact Analysis of the Joint Control Excavation Loess Slope's Stability under the Influence of Rainfall Infiltration Channel

作　　者：王新刚[1] 余宏明[1] 胡斌[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：《山地学报》2013年第4期413-417,共5页Mountain Research

基　　金：国家自然科学基金面上项目(41172281);中央高校基本科研业务费专项资金项目(摇篮人才计划CUGL100413;特色学科团队CUG090104);国家科技部973项目(2011CB710604)资助~~

摘　　要：黄土节理控制着黄土开挖边坡地表径流的主要入渗通道,在降雨作用下黄土节理将逐步发育成大的入渗通道,加剧了黄土开挖边坡的破坏。通过野外现场地质调查,统计黄土开挖边坡的节理裂隙、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,利用岩土工程软件Flac3D模拟分析山西忻州河曲运煤大道黄土开挖边坡在降雨状况下入渗通道发育过程,分析了40 mm/d、80 mm/d、120 mm/d三种降雨工况下降雨24 h的入渗通道演化过程及开挖边坡破坏程度,以及降雨对黄土开挖边坡的影响;指出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。借用野外统计、调查结果概化建立入渗通道扩展演化数值模型,可以为工程地质条件相同黄土开挖边坡地区降雨作用下稳定破坏分析以及防治提供一种有效分析方法。The main infiltration channel of excavation loess slope＇ s surface runoff be controlled by loess＇ s joint, the loess joint 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 40 mm/day, 80 mm/day, 120 mm/day; Pointed out that the rainfall infiltration channel be destroyed under the action of rainfall when Slope high is about 60 m, should pay attention to the infiltration channel severe expansion and controlled while the slope is higher than 60 m. Use field statistics, survey results generalized infiltration channel extension e- volution numerical model is established, can for the engineering geological conditions of the same region under the action of rainfall in loess excavation slope stability failure analysis and prevention and control to provide an effective analysis method.

关 键 词：入渗通道 黄土节理 演化过程 数值分析模型 

分 类 号：P642.22[天文地球—工程地质学]