平推式滑坡中承压水的敏感性研究  

SENSITIVITY OF CONFINED GROUND WATER IN TRANSLATIONAL LANDSLIDE

作　　者：李伟[1,2] 吴礼舟[1,2] 肖蓉[3] 

机构地区：[1]成都理工大学环境与土木工程学院,成都610059 [2]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都610059 [3]宜宾学院,宜宾644000

出　　处：《工程地质学报》2017年第2期480-487,共8页Journal of Engineering Geology

基　　金：国家自然科学基金重点项目(41130745);国家基础研究计划(973计划)项目(2013CB733202);四川省青年科技创新研究团队(2015TD0030)资助

摘　　要：研究平推式滑坡中承压水的作用范围,有利于准确评价斜坡稳定性,对平推式滑坡的成灾机理研究和灾害防治具有较好的指导意义。平推式滑坡中岩层倾角α较小,在承压水作用范围分析时通常忽略了岩层倾角的影响。基于地下水向河渠运动相关理论,考虑岩层倾角,建立平推式滑坡地下水渗流分析模型,推导出承压水作用范围L_1新的计算公式,详细计算分析了不同透水层参数下L_1对α的敏感性,并提出了敏感倾角的概念。计算结果表明,α对L_1影响显著,这种影响程度与透水层厚度、渗流量、以及渗透系数密切相关,透水层厚度越大,α对L_1的影响越显著;同时敏感倾角受透水层厚度、渗流量、渗透系数等参数影响。最后应用新模型分析滑坡实例,验证了新模型的合理性。It is important to study the confined groundwater range of action in the translational landslide. It is helpful to accurately evaluate the slope stability,and provides a reasonable guidance for the study on disaster mechanism and disaster prevention of translational landslide. The dip angle of the rock formation is small. The influence of the dip angle is usually neglected in the analysis of the confined groundwater range of action in the translational landslide. Based on the theory of groundwater flow to canals,considering the dip angle,the analysis model of groundwater seepage about the translational landslide is established. A new formula calculating the confined water range of action is deduced. The sensitivity of confined groundwater to the dip angle is analyzed in detail. The concept of the sensitive dip angle is put forward. The calculation results show that the dip angle hassignificant effect on the confined groundwater range of action. This effect is closely related to the thickness of the permeable layer,the seepage discharge,and the coefficient of permeability. The greater the thickness of the permeable layer,the more significant the dip angle impact on the range of action of confined groundwater.Meanwhile,the sensitive dip angle is influenced by the thickness of the permeable layer,the seepage discharge,the coefficient of permeability and so on. At last,the new model is used to analyze the landslide. The rationality of this new model is verified.

关 键 词：平推式滑坡 渗流 承压水 敏感倾角 斜坡稳定性 

分 类 号：P642.22[天文地球—工程地质学]