摘要
从动态分析和数值模拟两方面讨论了滑坡过程中的地下水作用机理和地下水动力场的时空分布问题 ,建立了二维极限平衡状态下的临界水位高度模型和描述滑坡剖面二维不稳定流动问题的动力学模型 ;以临界水位高度模型对重庆土台镇滑坡稳定性分析的研究结果表明 ,该滑坡的防治措施宜首先考虑地表水防渗和地下排水方案 ,在滑坡位移监测的同时更应考虑位移、降雨量、地下水动态三者的结合 ;采用数值模型计算了长江三峡库区鸡扒子滑坡因降雨入渗而引起的地下水动力场的时空分布 ,研究结果表明 ,地下水水位和流速场的时空演化过程与滑坡发生的时空特点基本吻合 ,当降雨达到 46 h时 ,滑坡体中地下水流向与滑动面倾向基本一致 ,尤其是在滑体底部出现潜水流 ,此时的地下水流动对滑坡稳定性最为不利。
The paper mainly discusses the dynamic analysis and simulation of underground water flow caused by the infiltration of rainfall in landslide process based on theoretical presentation of threshold underground water level in terms of two dimensional limit equilibrium model and dynamic modeling of unstable flow.It takes Tutai landslide in Chongqing as an example to demonstrate the threshold underground water level model. It emphasizesd that the protection of rainfall infiltration and underground water drainage should be firstly considered for stabilization measures.Meanwhile,it has recommended a comprehensive monitoring system targeting to ground displacement, precipitation and fluctuation of underground water level. Dynamic underground water flow of Jipazi landslide which occurred in the reservoir of Three Gorges is calculated according to the simulation of unstable underground water flow,which presents the spatial and temporary characteristics of underground water flow as the result of infiltration of precipitation. The study reveals that after 46 hours of rainfall,the direction of underground water in the landslide body became parallel to the inclination of landslide surface, and seepage occurred at the foot of slope that significantly indicates critical situation for the development of Jipazi landslide.
出处
《地质科技情报》
CAS
CSCD
北大核心
2002年第1期75-78,共4页
Geological Science and Technology Information
基金
国家自然科学基金资助项目 ( 4 0 0 72 0 84)
