- 摘 要
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（1 中國地質(zhì)大學(xué)（北京）工程技術(shù)學(xué)院， 北京 100083；
2 國土資源部深部地質(zhì)鉆探技術(shù)重點(diǎn)實驗室， 北京 100083;
3 萬達(dá)集團(tuán)項目管理中心， 北京 100022）
［摘要］膨脹土遇水發(fā)生軟化，導(dǎo)致土體強(qiáng)度降低，降雨入滲對膨脹土路塹邊坡影響較大。依據(jù)巖土飽和/非飽和滲流理論，利用有限元數(shù)值模擬分析軟件，通過降雨入滲模型分析，建立膨脹土路塹邊坡飽和/非飽和降雨入滲模型，模擬了降雨過程中邊坡地下水含水率、壓力水頭變化規(guī)律，分析研究降雨入滲對路塹邊坡滲流場及穩(wěn)定性的影響規(guī)律。結(jié)果表明：降雨入滲對膨脹土邊坡滲透影響僅發(fā)生在淺部區(qū)域，坡面低滲透性影響雨水入滲效果，裂隙性坡面則入滲稍快；對于低透水性、高基質(zhì)吸力，短期降雨不至于導(dǎo)致邊坡大面積滑塌破壞，邊坡滑面只出現(xiàn)在表層，表現(xiàn)為淺層滑動，對深部土體影響不大。為以后膨脹土路塹邊坡施工與防護(hù)提供一定的理論依據(jù)和數(shù)據(jù)參考。
［關(guān)鍵詞］降雨入滲； 膨脹土； 路塹邊坡； 有限元
中圖分類號： TU443 文獻(xiàn)標(biāo)識碼： A文章編號： 1002-848X(2016)S1-0851-05
Effects of rainfall and infiltration on the stability of expansive soil cutting slope
Wu Bohong1,2, Mo Jiang3
（1 School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;
2 Key laboratory on Deep Geo-Drilling Technology of the Ministry of Land and Resources, China University of Geosciences,
Beijing 100083, China; 3 Project Management Center, Wan Da Group, Beijing 100022, China)
Abstract: The expansive soil infiltrated with water resulting in reduced soil strength, which has greater impact on the stability of expansive soil cutting slope. Accodring to the rainfall infiltration model based on the geotechnical unsaturated/saturated seepage theory, the expansive soil cutting slope rainfall infiltration model was established by a finite element numerical simulation software, and the groundwater moisture content during the rainfall, pressure head variation, seepage field and stability effects by rainfall and infiltration were all studied. The results show that effects of rainfall and infiltration only occur in shallow areas. The infiltration was influenced by the low permeability of slope, while the fissured slope has large infiltration. For low permeability, high matric suction, short-term rainfall does not lead to a large area of slope slump destruction. Slope slip surface only in the surface layer, the performance of shallow slide, not for deep soil affected. Results from this paper provide a theoretical basis and reference data for future expansive soil slope construction and protection.
Keywords: rainfall; expansive soil; cutting slope; finite element
作者簡介： 吳波鴻，博士，工程師。
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