复合地基承载力和抗震性能初探
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摘要
地基处理最终沉降量和理论计算值往往存在一定的差异,静载试验时桩头状态的改变会明显影响到沉降曲线,这就为人为地创造一种预定的更合理的沉降曲线提供了依据。褥垫层的设置使每根桩相互独立,桩、桩间土和基础变形不同步,削弱了结构整体抗震性能。而采用"桩伴侣"作为构造措施,桩顶预留沉降,使复合地基桩在高度范围内对地基土形成一定的约束,在提高竖向承载力的同时也提高了地基土的水平承载力。
Foundation treatment of final settlement and theoretical calculation values tend to exist certain difference,static load test of pile head of state changes will greatly influence the settlement curve,that is to artificially create a predetermined,more reasonable settlement curves provide the basis for.The cushion is arranged to separate each pile,pile,the soil between the piles and foundation deformation is not synchronous,weaken the overall structural performance.Technical measures can still use "pile partner"as structural measures,the pile top settlement reservation,the composite foundation formed certain constraints on the foundation soil in the altitude range,to improve the vertical bearing capacity and improve the horizontal bearing capacity of foundation soil.
Foundation treatment of final settlement and theoretical calculation values tend to exist certain difference,static load test of pile head of state changes will greatly influence the settlement curve,that is to artificially create a predetermined,more reasonable settlement curves provide the basis for.The cushion is arranged to separate each pile,pile,the soil between the piles and foundation deformation is not synchronous,weaken the overall structural performance.Technical measures can still use "pile partner"as structural measures,the pile top settlement reservation,the composite foundation formed certain constraints on the foundation soil in the altitude range,to improve the vertical bearing capacity and improve the horizontal bearing capacity of foundation soil.
引文
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[9]中国发明专利:桩头的箍与带箍,专利号:200710160966.1
[2]郑刚.刚性桩复合地基承载力的确定问题[J].地基处理,2002(4)
[3]郑刚,高喜峰,任彦华等.承台(基础)—桩不同构造形式下桩土相互作用分析[J].岩土工程学报,2004(5)
[4]薛江炜,蔡景珞,杨勇等.水平静力荷载作用下桩伴侣工作性状有限元模拟以及与无伴侣构造形式的比较分析[J].岩土工程学报,2013(S1)
[5]胡再强,王军星,刘兰兰等.褥垫层作用下复合地基抗震性能有限元分析[J].岩土力学,2008(S)
[6]李韬,高大钊,顾国荣.沉降控制复合桩基“时间效应”的简化力学模型分析[C].2004年度上海市土力学与岩土工程学术年会论文集,2004
[7]王伟,杨尧志.水泥粉煤灰碎石桩复合地基抗震性能分析[J].世界地震工程,2000(2)
[8]宋二祥,武思宇,刘华北.刚性桩复合地基地震反应的拟静力计算方法[J].岩土工程学报,2009(11)
[9]中国发明专利:桩头的箍与带箍,专利号:200710160966.1
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