桩板墙桩土作用机理有限元分析
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摘要
桩板墙是一种已得到广泛应用的新型支挡结构。该文采用数值分析方法对岩土体和桩共同作用下,桩上部岩土体剩余下滑力的作用形式、桩身传力方式、桩身内力的计算方法等进行了分析。得到了板桩墙能够显著改善桩后岩土体桩轴法线方向应力矢量的方向和分布特征,使桩后岩土体的桩轴法线方向的应力矢量分异减小;同时能够将上部坡体和下部锚固段岩土体连接成一个共同作用体,利用其自身强大抗弯能力,在阻止上部变形体出现过大的侧向变形的同时,协调两部分岩土体侧向变形;还能有效改善因开挖引起的坡脚应力集中现象和上部拉应力现象,避免岩土体因过大的应力集中而导致塑性破坏的认识。其分析方法和得到的认识,可为相关工程的优化设计提供参考。
The sheet-pile wall is a new kind of retaining structure used widely.Cy the FEM method,this paper studies the distribution shape of the slide push force and the calculation of the internal force of the pile and the calculation and distribution shape of rock and soil's passive resistance around the pile's anchorage segment.The study results show that the sheet-pile can meliorate the direction of the stress vector and the distribution characteristics of the rock and soil behind the sheet-pile.And the sheet-pile can reduce the difference of pile's normal stress vectors of the rock and soil behind the pile,and it can connect the rock and soil behind the sheet-pile as a whole and harmonize the rock and(soil's) lateral deformation behind the sheet-pile by making use of the sheet-pile's capability of resisting bend.And the sheet-pile can meliorate the rock and soil's stress condition,avoiding the rock and soil's plastic failure.These conclusions can offer some gists for design,and the method can be used as a reference in other similar projects.
The sheet-pile wall is a new kind of retaining structure used widely.Cy the FEM method,this paper studies the distribution shape of the slide push force and the calculation of the internal force of the pile and the calculation and distribution shape of rock and soil's passive resistance around the pile's anchorage segment.The study results show that the sheet-pile can meliorate the direction of the stress vector and the distribution characteristics of the rock and soil behind the sheet-pile.And the sheet-pile can reduce the difference of pile's normal stress vectors of the rock and soil behind the pile,and it can connect the rock and soil behind the sheet-pile as a whole and harmonize the rock and(soil's) lateral deformation behind the sheet-pile by making use of the sheet-pile's capability of resisting bend.And the sheet-pile can meliorate the rock and soil's stress condition,avoiding the rock and soil's plastic failure.These conclusions can offer some gists for design,and the method can be used as a reference in other similar projects.
引文
[1]陶波,佴磊,伍法权,等.抗滑桩与周围岩土体间相互作用力的分布规律[J].吉林大学学报(地球科学版),2005,35(2):201-206.
[2]孔德森,栾茂田,杨庆.桩土相互作作用分析中的动力Winker模型研究评述[J].世界地震工程,2005,21(1):12-17.
[3]何昌荣,李彤,陈群,等.新型预应力锚拉式桩板墙的三维有限元计算分析[J].岩石力学与工程学报,2003,22(5):843-848.
[4]戴自航.抗滑桩滑坡推力和桩前滑体抗力分布规律的研究[J].岩石力学与工程学报,2002,21(4):517-521.
[5]于清杨,佴磊,詹军.抗滑桩与围岩相互作用力分布规律的探讨[J].长春科技大学学报,2001,31(1):18-21.
[6]铁道部第二勘测设计院.抗滑桩设计与计算[M].北京:中国铁道出版社,1983.
[7]李海光,周德培,李安洪,等.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2004:229-230.
[2]孔德森,栾茂田,杨庆.桩土相互作作用分析中的动力Winker模型研究评述[J].世界地震工程,2005,21(1):12-17.
[3]何昌荣,李彤,陈群,等.新型预应力锚拉式桩板墙的三维有限元计算分析[J].岩石力学与工程学报,2003,22(5):843-848.
[4]戴自航.抗滑桩滑坡推力和桩前滑体抗力分布规律的研究[J].岩石力学与工程学报,2002,21(4):517-521.
[5]于清杨,佴磊,詹军.抗滑桩与围岩相互作用力分布规律的探讨[J].长春科技大学学报,2001,31(1):18-21.
[6]铁道部第二勘测设计院.抗滑桩设计与计算[M].北京:中国铁道出版社,1983.
[7]李海光,周德培,李安洪,等.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2004:229-230.
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