文档介绍：浙江大学硕士学位论文软土基坑土钉支护计算分析朱益2005年2月软土基坑土钉支护计算分析摘要近年来土钉支护结构得到了广泛的应用,不仅在北方等土层性质较好的地区,在沿海等软土地区也得N T越来越多的应用,但相关的理论研究目前均落后于工程实践。本文鉴于软土地区深基坑工程土钉支护结构的研究及设计现状在前人研究的基础上,主要完成了以下几个方面的工作: (包括内力和位移),分析比较土钉/JnA-前后基坑的水平位移、沉降以及塑性区开展的不同,这样可以方便的显示结构在加载过程中的逐步破坏过程以及各阶段结构的应力和位移状态。通过有限元模拟,能够更加合理地模拟结构的支护作用,更真实地揭示出结构的破坏机制。 ,包括土钉长度、布置方式、倾角、面层厚度、粘聚力、内摩擦角。 ,并得到土体参数和桩体参数与复合土钉支护之间的关系,得出土体的弹性模量和泊松比对复合土钉支护有重要影响,另外搅拌桩的插入深度和宽度都有临界值。 ,对被动区不同加固的范围进行对比,比较分析加固深度和宽度对复合土钉结构性状的影响,--1倍和02~。关键词:软土基坑:土钉支护;有限元;参数;复合土钉;加固 Numerical Analysis oftheSoilNailed Retaining Structure fortheExcavation inSoftSoil Abstract Recently,the soll nailed retaining structure hasbeen popular for the excavation not only in the northern hard—seil but in the coastal soft theories about the soil nailed retaining structure are lagging behind the engineering this thesis,the studies 1isted below were carried out. cons idering current researchanddesign status ofthe soilnailedretaining structure. lateral displacement, settlement and plastic aera of excavation were analyzed numerically when the soil nailed retaining structure was applied to the the numerical simulation,the failure process ofthe structure was ahowed and thus the retaining effect was obtained. effect to the excavation with regard to various parameters of the soil nailed retaining structure WaS studied,including the nail length,the pattern of arrangement,the slope angle,ere retaining mechanism posite naiis and the relationshiD between the Parameters of soli and pileand posite nails WaS analyzed in this thesis. The analysis shows that the modulus ofsoii a】矧Poisson ratio greatIy affect the Soll Nailed Retaining Structure and that the depth and width of mixed—in-place pile both have critieal values 4,The stabi】ity ofthe passive soil aroundthe excavationwas studied with re空ard to various improved aera posite nailS,such as their depth an