接觸面特性對雙排樁支護性狀的影響分析
余 波，豐土根，熊中華
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（河海大學(xué)巖土工程研究所，南京 210098）[摘要] 采用有限元軟件ABAQUS來模擬某雙排樁支護深基坑開挖過程，并與實際監(jiān)測數(shù)據(jù)對比。分析雙排樁-土接觸面摩擦系數(shù)對基坑變形、樁身彎矩、土壓力分布等的影響，分析結(jié)果表明：摩擦系數(shù)對樁頂水平位移及樁身彎矩存在明顯影響，但影響程度有限；摩擦系數(shù)對坑內(nèi)被動區(qū)土壓力分布影響顯著，而對主動區(qū)影響并不明顯。樁-土界面摩擦系數(shù)也是影響基坑變形的重要因素。在實際工程中應(yīng)采取適當(dāng)?shù)姆椒▉硖岣邩?土接觸界面特性，利于進一步地控制基坑變形。[關(guān)鍵詞] 基坑; 雙排樁; 有限元; 接觸面; 摩擦系數(shù)中圖分類號：TU470.3 文獻標(biāo)識碼：A 文章編號：1002-848X(2013)S2-0628-05作者簡介：余波，碩士研究生， E-mail:yubest09@163.com。Analysis of pile-soil interface characteristics affecting the performance of double-row piles retaining structureYu Bo, Feng Tugen, Xiong Zhonghua(Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China)Abstract: The finite element software ABAQUS are used to simulate a double piles deep foundation excavation process, and comparing with the actual monitoring data. Effects of double-row piles-soil interface friction coefficient on pit deformation, bending moment, and the distribution of earth pressure etc are analyzed. The results showed that: the friction coefficient have a significant effect on the top of the pile horizontal displacement and bending moment, but the impact level limites. Passive earth pressure distribution area was significantly affected by friction coefficient, while the active region was not obviously impacted. Piles-soil interface friction coefficient was also an important factor affecting pit deformation. In the actual project, taking appropriate methods to improve the piles-soil contact interface characteristics will further control pit deformation.Key words: deep foundation pit; double-row pile; interface; friction coefficient
