微预应力作用下搅拌桩复合型土钉支护的性状分析  

Analysis of function of soil-cement mixing piles composite soil nailing by small pre-stress

作　　者：李海深 林琳[2] 邹银生[3] 

机构地区：[1]湘潭市建设局,湖南湘潭411100 [2]湘潭大学土木工程与力学学院,湖南湘潭411105 [3]湖南大学土木工程学院,湖南长沙410082

出　　处：《建筑科学与工程学报》2005年第1期91-94,共4页Journal of Architecture and Civil Engineering

基　　金：湖南省建设系统科技计划项目(20000111;20000422);湖南省教育厅资助项目(02C591)

摘　　要：针对搅拌桩复合型土钉支护的受力和变形情况,提出了一种减小基坑变形的新型施工方法———土钉施加微预应力法,对微预应力作用下的搅拌桩复合型土钉支护进行非线性有限元分析,并且将变形结果与没有施加预应力的搅拌桩复合型土钉支护进行比较,发现对土钉施加微预应力可有效减小基坑壁水平位移的40%～50%,同时减少地面沉降40%～60%,但该方法不能减小基坑的隆起量。To cope with the situtions which soil-cement mixing piles composite soil nailing being loaded and deformation,the paper puts forward a new construction method which can lessen the deformation of wall—method of adding small pre-stress by soil nailing,and analyzes soil-cement mixing piles composite soil nailing by small pre-stress with nonlinear FEM.In contrast of the structure displacement result between soil-cement mixing piles composite soil nailing by small pre-stress and without any pre-stress,some conclusions are obtained that the method of infliction small pre-stress on nailing can efficiently reduce the foundation pit wall’s horizontal displacement 40%～50% and the land subsidence 40%～60%,but cannot cut down the vertical displacement of foundation pit bottom.

关 键 词：复合型土钉支护 微预应力 搅拌桩 施工方法 变形性能 非线性有限元分析 受力性能 

分 类 号：TU753[建筑科学—建筑技术科学]