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外部降雨条件和内部瞬态承压水作用对堆积层滑坡的影响分析和数值模拟
汪磊, 尚岳全
浙江大学 建筑工程学院, 浙江 杭州 310058
摘要:
[目的] 分析瞬态承压水的发育特征,为该类滑坡的预防和治理提供科学借鉴。[方法] 以浙江省丽水市松阳县范山头滑坡为例,对其松散堆积体边坡内部的瞬态承压水的作用机理进行模拟和研究,通过分析滑坡区域的地质背景条件、水文地质条件、变形破坏特征,并与降雨数据进行对比,采用GeoStudio数值模拟软件对不同的降雨条件和坡体初始水位进行模拟。[结果] 当滑坡体存在渗透性差异很大的不同岩土层时,强降雨作用或者较高的初始水位会促进瞬态承压水的出现和发展,降低边坡的稳定性。[结论] 外部降雨和瞬态承压水的产生和发展对堆积层滑坡的产生有重要的影响作用,降低了坡体的稳定性,促进了滑坡的出现。
关键词:  堆积层边坡  瞬时承压水  发育特征  降雨强度  初始水位  GeoStudio
DOI:10.13961/j.cnki.stbctb.2020.05.021
分类号:TU43
基金项目:国家自然科学基金项目”滑坡的水文地质条件分类研究”(41772276);浙江省重点研发计划(2017C03006)
Analysis and Numerical Simulation on Influence of External Rainfall Conditions and Internal Transient Confined Water on Accumulation Landslide
Wang Lei, Shang Yuequan
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China
Abstract:
[Objective] The development characteristics of transient confined water were analyzed to provide scientific reference for the treatment and prevention of accumulation landslide.[Methods] Taking the Fanshantou landslide at Songyang County, Lishui City, Zhejiang Province as an example, the mechanism of transient confined water in the loose accumulation slope was simulated and studied. By analyzing the geological background conditions, hydrogeological conditions, the deformation and failure characteristics of the landslide area, and by comparing them with the rainfall data, the different rainfall conditions and the initial water lever of the slope were simulated using the GeoStudio numerical simulation software.[Results] When there were different layers with different permeability in landslide mass, heavy rainfall or high initial water level would promote the emergence and development of transient confined water and reduce the stability of slope.[Conclusion] The generation and development of external rainfall and transient confined water have an important impact on the formation of accumulation landslide. It could reduce the stability of slope and promote the appearance of landslide.
Key words:  accumulation slope  transient confined water  developmental characteristics  rainfall intensity  initial water level  GeoStudio