降雨入渗条件下考虑裂隙和风化对煤系土堑坡稳定性影响分析  

Analysis on Stability of Coal Measure Soil Slope Considering Fissures and Weathering under Rainfall Infiltration

作　　者：祝磊[1] 韩尚宇 洪宝宁[3] 宋新江[1] 

机构地区：[1]淮委水利科学研究院,安徽蚌埠233000 [2]江西省交通科学研究院,江西南昌330038 [3]河海大学岩土工程研究所,江苏南京210098

出　　处：《水利与建筑工程学报》2010年第4期86-89,118,共5页Journal of Water Resources and Architectural Engineering

基　　金：水利部公益性行业科研专项经费项目(200901053-2)

摘　　要：利用非饱和瞬态渗流有限元程序对不同裂隙和风化深度的煤系土堑坡进行了降雨入渗坡体渗流场数值计算和分析。并基于非饱和土力学强度理论,应用Morgenstern-Price方法,调用不同裂隙和风化深度的渗流计算结果对煤系土堑坡的瞬态稳定性进行了研究。结果表明：降雨对煤系土堑坡渗流场的影响仅局限于裂隙和风化区,堑坡内部渗流场的分布几乎没有变化;同时考虑裂隙和风化时,安全系数受降雨影响大,降雨入渗很容易引起堑坡的失稳。因此,在研究煤系土堑坡降雨入渗和稳定性分析中应考虑裂隙和风化层的影响,且研究成果为煤系土堑坡设计、施工和稳定性分析提供了依据。With the FEM program of transient unsaturated seepage calculation,the seepage field of coal measure soil slope with the infiltration process of rainfall is simulated and analyzed according to different fissure and weathering depths.Then,based on Morgenstern-Price method,the transient safety factor of coal measure soil slope is computed and analyzed by means of unsaturated soil strength theory and calling the seepage results at different fissure and weathering depths.The results obtained in this paper show that the influence of rainfall is only confined to the fissure and weathering area in the seepage field of coal measure soil slope,and the rainfall has little effect on the seepage field of internal slope of coal measure soil;as the rainfall largely affects the safety factor considering fissures and weathering,the rainfall infiltration easily generates the landslide.Therefore,the fissure and weathered layer should be considered in rainfall infiltration and stability analysis of coal measure soil slope,and this research production could provide the basis for the design,construction and stability analysis of coal measure soil slope.

关 键 词：煤系土 降雨 孔隙水压力 体积含水率 瞬态稳定性 

分 类 号：U416.14[交通运输工程—道路与铁道工程]