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长短桩组合型复合地基优化设计方法研究
引用本文:陈昌富,肖淑君,牛顺生.长短桩组合型复合地基优化设计方法研究[J].力学学报,2006,14(2):229-232.
作者姓名:陈昌富  肖淑君  牛顺生
作者单位:湖南大学土木工程学院,长沙410082
基金项目:湖南省自然科学基金(03JJY3087);湖南省建设厅科技基金(200402)资助项目
摘    要:在软土地基上建造建(构)筑物需要进行地基处理,复合地基是一种行之有效的地基处理方式。工程上一般对地基浅层土的承载力要求较高,而深层只需满足下卧层强度要求即可。长短桩复合地基可做到浅层置换率高,深部置换率低,这样就合理地满足了软弱地基不同深度对承载力的要求。同时长短桩复合地基浅部置换率高,加固区复合地基模量大,深部置换率低,复合地基模量较低,正好适应浅部附加应力大,深部附加应力小的应力场,这样对减少软弱地基总沉降有利。本文探讨了长短桩复合地基优化设计方法,提出了长短桩复合地基优化设计数学模型,并利用复合形法求解优化设计数学模型,同时给出了优化设计计算算例,计算结果表明,此优化设计方法不仅可有效地保证长短桩复合地基设计方案技术上可靠,还可获得最佳的经济效益。

关 键 词:  复合地基  承载力  沉降  优化设计  复合形法
收稿时间:2005-04-11
修稿时间:2005-07-28

OPTIMIZATION DESIGN METHOD OF LONG-SHORT-PILE COMPOSITE FOUNDATION
CHEN Changfu,XIAO Shujun,NIU Shunsheng.OPTIMIZATION DESIGN METHOD OF LONG-SHORT-PILE COMPOSITE FOUNDATION[J].chinese journal of theoretical and applied mechanics,2006,14(2):229-232.
Authors:CHEN Changfu  XIAO Shujun  NIU Shunsheng
Institution:College of Civil Engineering,Hunan University,Changsha,410082
Abstract:Foundation treatment is necessary when a structure is built over the soft clay ground.A composite foudation is one of effective reinforcement methods.In general,a project requires a higher bearing capacity in shallow soil and sufficient strength in deep soil to support the overlying soil layer.A long-short-pile composite foundation with a high replacement ratio in the shallow layer and lower one in the deep layer,satisfies demands for bearing capacity in soft foundation at diffenrent depths.Meanwhile,shallow composite modulus is high because of high replacement ratio,while deep composite modulus is low.As a result,high stresses will occur in the shallow soil and low stresses in deep one,which is a favorable distribution for decreacing total settlement of the soft foundation.A optimization mathematical model is developed and solved using complex method.A case study is given to demonstrate the optimization design method.The results show that the most reliable and economical design can be easily obtained from the presented method.
Keywords:Pile  Composite foundation  Bearing capacity  Settlement  Optimization design  Complex method
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