甘肃永靖黑方台灌区潜水渗流场与斜坡稳定性耦合分析  

The coupled analysis of phreatic water flow and slope stability at Heifangtai terrace, Gansu Province

作　　者：孙萍萍[1] 张茂省[1] 董英[1] 于国强[1] 朱立峰[1] 

机构地区：[1]国土资源部黄土地质灾害重点实验室/中国地质调查局西安地质调查中心,陕西西安710054

出　　处：《地质通报》2013年第6期887-892,共6页Geological Bulletin of China

基　　金：中国地质调查局项目(编号:1212011014024);国家科技支撑计划课题(编号:2012BAK10B02)

摘　　要：渗流场与斜坡稳定性的耦合分析是揭示灌溉诱发型黄土滑坡机理的重要途径,也是后续开展基于水位的滑坡灾害风险控制的基础。在综合分析研究区地质结构和水文地质条件的基础上,以调查、钻探、测量、三维激光扫描和监测资料为依据,联合应用Visual Modflow和FLAC3D数值模拟软件,开展潜水渗流场与斜坡稳定性的耦合分析,模型计算结果与监测及野外调查结果吻合较好,潜水渗流场的演化对斜坡稳定性具有控制作用,随着潜水位的升高,台塬周边不稳定区域逐年增加,1990、2000和2010年焦家崖头附近最大位移值分别为0.85、1.19和1.80m。The coupled analysis of groundwater flow and slope stability is an important means for studying mechanism of loess landslides induced by irrigation. It is also the basis for the employment of risk mitigation based on water level control. According to the data obtained from investigation, drilling, measuring, and 3D laser scanning, the coupled analysis of phreatic water and slope stability was conducted with Visual Modflow and FLAC3D software. The calculated results with the coupled model fit well with the investigation data. The slope stability was determined by phreatic water table. The deformation area increases with the rise of water table. The maximum value of displacement around Jiaojia cliff in 1990, 2000 and 2010 was 0.85, 1.19 and 1.80 m, respectively.

关 键 词：潜水渗流场 斜坡稳定性 耦合分析 VISUAL MODFLOW 

分 类 号：P641.132[天文地球—地质矿产勘探]