半岩半土地基不均匀沉降的变刚度复合地基方案研究
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摘要
以延安市安塞区拟建住宅楼为工程实例,提出变刚度复合地基方案,借助有限元分析软件MIDAS GTS NX,对半岩半土地质条件下变刚度复合地基进行数值模拟,通过改变桩间土模量、桩体模量、桩距、桩长等设计参数对地基土沉降特性进行研究,并分析地基差异沉降判断变刚度复合地基的适用性。研究结果表明:变刚度复合地基可较好解决半岩半土地基的不均匀沉降问题,通过调节变刚度复合地基设计参数,可控制地基差异沉降在合理范围之内。
Taking a proposed residential building in Ansai District,Yanan as an example,a program of variable stiffness composite foundation is proposed. The variable stiffness composite foundation of half-hard and half-soft rock geological conditions is carried out by numerical simulation with the finite element analysis software MIDAS GTS NX. The settlement characteristics of foundation are studied by changing the design parameters of soil modulus,pile modulus,pile spacing,pile length and so on. The suitability of variable stiffness composite foundation is based on the study of differential settlement. The results show that differential settlement of half-hard and half-soft rock foundation can be solved by the variable stiffness composite foundation. The differential settlement can be controlled within a reasonable range by adjusting the design parameters of variable stiffn ess composite foundation.
Taking a proposed residential building in Ansai District,Yanan as an example,a program of variable stiffness composite foundation is proposed. The variable stiffness composite foundation of half-hard and half-soft rock geological conditions is carried out by numerical simulation with the finite element analysis software MIDAS GTS NX. The settlement characteristics of foundation are studied by changing the design parameters of soil modulus,pile modulus,pile spacing,pile length and so on. The suitability of variable stiffness composite foundation is based on the study of differential settlement. The results show that differential settlement of half-hard and half-soft rock foundation can be solved by the variable stiffness composite foundation. The differential settlement can be controlled within a reasonable range by adjusting the design parameters of variable stiffn ess composite foundation.
引文
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[2]王晓琳,王棣生.北京某山区高层住宅工程地基基础设计[C]//第18届全国结构工程学术会议.中国广东广州,2009:4.
[3]罗庆英.软土和岩石组合地基基础处理方法与实例[J].中外建筑,2008(6):146-148.
[4]张凤文,陈广刚,赵国忠.振冲碎石桩法在土岩组合地基中的应用[J].岩石力学与工程学报,2000,19(2):242-245.
[5]王栋,周峰.土岩组合地基变刚度调平设计新方法[J].浙江建筑,2012(6):23-25.
[6]郑俊杰,王仙芝,韩超,等.钢管桩与砂桩多元复合地基室内模型试验[J].华中科技大学学报:自然科学版,2008(9):121-124.
[7]袁超,张涛.刚柔性桩复合地基性能数值模拟研究[J].公路工程,2014(5):83-87.
[8]朱奎,徐日庆,吴冬虎,等.刚-柔性桩复合地基处理桩基质量事故的应用研究[J].建筑结构,2007(6):102-104.
[9]韩煊,李宁.多元复合地基的概念及其基本设计思路[J].工业建筑,2005(Z1):475-478.
[10]周茗如,王晋伟,樊乐涛,等.二元桩复合地基在湿陷性黄土中的应用研究[J].施工技术,2017(11):119-123.
[11]彭典华,白秀琴,黄涛,等.CFG桩和砂石桩加固吹填河漫滩地基的试验研究[J].土工基础,2012,26(6):101-105.
[12]JGJ79-2012,建筑地基处理技术规范[S].
[13]GB50783T-2012,复合地基技术规范[S].
[14] GB50007-2011,建筑地基基础设计规范[S].