抗滑桩加固黏性土坡变形规律的离心模型试验研究
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摘要
采用土工离心机及专用振动台,进行了静动力加载条件下抗滑桩加固黏性土坡的离心模型试验。测量了试验过程中边坡的位移场和加速度响应的变化过程以及抗滑桩的位移和应变分布。试验结果表明地震过程中土坡的加速度响应自下而上逐渐增大,震后残余变形的水平分量最值相比震前向坡上部移动。静动力加载过程中,抗滑桩内侧土体存在一个面,其内外两侧的土体位移表现出不同的水平位移变化规律,从而可以将抗滑桩加固土坡划分成4个分别具有不同变形特性的区域;同一高程处桩的水平位移大于内侧土体而小于外侧土体;抗滑桩与土发生较复杂的相互作用,并使得土坡的变形趋于均匀。
The behaviors of cohesive soil slopes reinforced by stabilizing piles are investigated using centrifuge model tests.The static and dynamic loading conditions are considered in the tests using the geotechnical centrifuge machine with the shaking table.The response of the slope-pile system is measured during testing,including the histories of displacement and acceleration of the slope,and the displacement and strain distribution of the stabilizing piles.The results show that the acceleration response of the slope increases gradually with the increasing altitudes during the earthquake.There is a surface on the inner side of the piles in the slope during the static and dynamic loading,indicating a boundary of different change rules of horizontal displacement.Therefore,the pile-reinforced slope can be divided into four zones with different deformation behaviors.The horizontal displacement of the pile is larger than that of the inner soil and less than that of the outer soil.The piles exhibit a complex interaction with the slope,resulting in a more uniform deformation.
The behaviors of cohesive soil slopes reinforced by stabilizing piles are investigated using centrifuge model tests.The static and dynamic loading conditions are considered in the tests using the geotechnical centrifuge machine with the shaking table.The response of the slope-pile system is measured during testing,including the histories of displacement and acceleration of the slope,and the displacement and strain distribution of the stabilizing piles.The results show that the acceleration response of the slope increases gradually with the increasing altitudes during the earthquake.There is a surface on the inner side of the piles in the slope during the static and dynamic loading,indicating a boundary of different change rules of horizontal displacement.Therefore,the pile-reinforced slope can be divided into four zones with different deformation behaviors.The horizontal displacement of the pile is larger than that of the inner soil and less than that of the outer soil.The piles exhibit a complex interaction with the slope,resulting in a more uniform deformation.
引文
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[2]刘新荣,梁宁慧,黄金国,等.抗滑桩在边坡工程中的研究进展及应用[J].中国地质灾害与防治学报,2006,17(1):56–62.(LIU Xin-rong,LIANG Ning-hui,HUANG Jin-guo,et al.Study and application of stabilizing piles in slope engineering[J].Chinese Journal of Geological Disasters and Prevention,2006,17(1):56–62.(in Chinese))
[3]贺建清,张家生,梅松华.弹性抗滑桩设计中几个问题的探讨[J].岩石力学与工程学报,1999,18(5):600–602.(HE Jian-qing,ZHANG Jia-sheng,MEI Song-hua.Inquiring into some questions in designing anti-slide pile[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(5):600–602.(in Chinese))
[4]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M].北京:人民交通出版社,2006.(ZHENG Ying-ren,CHEN Zu-yu,WANG Gong-xian,et al.Engineering treatment of slope and landslide[M].Beijing:China Communications Press,2006.(in Chinese))
[5]BRANDENBERG S J,BOULANGER R W,KUTTER B L,et al.Behavior of pile foundations in laterally spreading ground during centrifuge tests[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(11):1378–1391.
[6]ABDOUN T,DOBRY R,O’ROURKE T D,et al.Pile response to lateral spreads:centrifuge modeling[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(10):869–878.
[7]于玉贞,邓丽军.抗滑桩加固边坡地震响应离心模型试验[J].岩土工程学报,2007,29(9):1320–1323.(YU Yu-zhen,DENG Li-jun.Centrifuge modeling of seismic behavior of slopes reinforced by stabilizing piles[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1320–1323.(in Chinese))
[8]ZHANG G,HU Y,ZHANG J.New image-analysis-based displacement-measurement system for centrifuge modeling tests[J].Measurement,2008.
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