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（中國中元國際工程有限公司， 北京 100089）
［摘要］通過對多階懸臂式擋土墻支護(hù)結(jié)構(gòu)在填土區(qū)工程應(yīng)用中發(fā)生的失穩(wěn)破壞案例進(jìn)行分析，采用庫侖土壓力理論，基于填土不同的內(nèi)摩擦角φ、黏聚力c取值，計算得出懸臂式擋土墻主動土壓力Ea與c，φ的變化曲線及主動土壓力合力作用點高度Zy與c，φ的變化曲線；并通過有限元方法計算出填土在不同內(nèi)摩擦角、黏聚力取值下?lián)跬翂Φ膽?yīng)力-應(yīng)變關(guān)系的變化趨勢，揭示了當(dāng)填土密實度較差，內(nèi)摩擦角φ≤20°時土質(zhì)邊坡易形成整體滑移破裂面而導(dǎo)致懸臂式擋土墻失穩(wěn)。強(qiáng)調(diào)了填土施工質(zhì)量以及排水措施對填土區(qū)多階支擋結(jié)構(gòu)的重要性。
［關(guān)鍵詞］填土區(qū)； 多階； 懸臂式擋土墻； 解析分析； 有限元分析
中圖分類號：TU413-6+2文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2016)24-0080-04
Analysis of instability failure mechanism for multi-level cantilever retaining wall
Zhang Yong， Wen Qingdong， Zhang Su， Meng Yongjie， Liu Manhuai， Zheng Ximing
(China IPPR International Engineering Corporation, Beijing 100089, China)
Abstract:The case study of instability failure of multi-level cantilever retaining wall used in filling soil area was carried out. Coulomb′s Theory of Earth Pressure was adopted based on values of internal friction angle (φ) and cohesion (c) of different filling soils, to obtain the change curve of cantilever retaining wall′s active soil pressure (Ea)， c and φ as well as the change curve of height of resultant action point of active soil pressure(Zy), c and φ. The finite element method was used changing trend of stress-strain relationship of retaining wall with soil of different internal friction angle and cohesion values. It shows that when the compactness of soil is poor and the internal friction angle is smaller than 20°, the soil slope is easy to form a whole slip rupture surface to cause instability of cantilever retaining wall. It emphasizes the importance of the quality of the fill soil construction and the drainage measures to the multi-level retaining structure in the filling soil area.
Keywords:filling soil area; multi-level; cantilever retaining wall; analytical analysis; FEA
作者簡介：張勇，本科，工程師，Email:zhangyong@ippr.net。
