基于有限元分析法的溶洞对桩基沉降的影响研究
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摘要
以国道322零陵段萍州大桥为工程背景,通过有限元软件计算分析,找出不同尺寸溶洞、不同溶洞与桩体的距离及不同岩体溶洞对桩基沉降的影响规律,并用MIDAS和ABAQUS软件分别就溶洞对桩沉降的影响进行了计算,分析验证了其计算结果的准确性。计算结果表明:桩基沉降随着溶洞水平尺寸的增大而增加;当溶洞竖向尺寸增大时,桩基沉降量增加较少;在一定范围内,当洞顶至桩尖的竖向距离增加时,桩基沉降量逐渐减小。
Based on the engineering background of Pingzhou Bridge across the river in 322 Lingling Section of National Highway,this paper finds out the influence law of different size caves,different distance between caves and piles and different rockbody on pile foundation settlement by using FEM. Through MIDAS and ABAQUS software, the effect of caves on pile settlement is analyzed respectively,and he accuracy of the calculation results is verified by this software. The calculation results show that the settlement of pile foundation increases with the increase of horizontal size of karst cave; the settlement of pile foundation increases less with the increase of vertical size of karst cave; and the settlement of pile foundation decreases gradually with the increase of vertical distance from cave top to pile bottom
Based on the engineering background of Pingzhou Bridge across the river in 322 Lingling Section of National Highway,this paper finds out the influence law of different size caves,different distance between caves and piles and different rockbody on pile foundation settlement by using FEM. Through MIDAS and ABAQUS software, the effect of caves on pile settlement is analyzed respectively,and he accuracy of the calculation results is verified by this software. The calculation results show that the settlement of pile foundation increases with the increase of horizontal size of karst cave; the settlement of pile foundation increases less with the increase of vertical size of karst cave; and the settlement of pile foundation decreases gradually with the increase of vertical distance from cave top to pile bottom
引文
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[2]王启云.桩锚体系m法和三维有限元法比较与分析[J].基建优化,2007(06):144-146.
[3]黎民.深基坑支护结构与土体共同作用的三维有限元分析[J].广东科技,2006(03):245-247.
[4]张崇文,何广民,王生生.三维空间桩与土作用的有限层-有限元混合法[J].天津大学报,1994,27(5):630-637.
[5]李云翼,陈国栋,甘德福,等.桩基最终沉降量的Gan-Chen模式计算方法[J].工程勘察,2002(06):4-6+38.
[6]邹新军,唐国东,赵明华.串珠状岩溶区桩基沉降计算与稳定分析[J].建筑结构,2013,43(13):95-98.
[7]赵联桢,杨平,刘成.土与结构接触面行为研究综述[J].交通科技,2012(05):83-87.
[8]郭海柱,张庆贺.土与结构接触面模型的对比研究[J].地下空间与工程学报,2009,5(06):114 5-1150.
[9]路德春,罗磊,王欣,等.土与结构接触面土体软/硬化本构模型及数值实现[J].工程力学,2017,34(07):41-50.
[10]张文学,陈壮,刘龙,等.岩溶区客运专线桥梁桩基沉降和注浆加固研究[J].铁道建筑,2015(08):27-31.
[11]刘一.基于单桩静载试验的桩基沉降计算方法研究[D].成都:西南交通大学,2016.
[12]佐腾悟.基础の支持の力学は机构[J].土木技术,1965,20:1-5.