典型周围环境下软土深基坑土方开挖方法分析报告.docVIP

PAGE PAGE I 摘要 随着城市建设的发展以及旧城改造的推进，基坑工程正向大深度、大面积方向发展，特别在宁波这种软土地区，基坑周边环境复杂，再加上软土的蠕动性，对基坑稳定和位移控制的要求非常严格。因此如何结合不同的施工环境来选择最佳的开挖方案是值得探讨的一个问题。 本文在归纳国内外关于软土开挖的基础上，分析了宁波软土地区常用的开挖方案和开挖时应遵循的原则，探讨了影响开挖的因素，再结合宁波的一些工程实例，进行了挖土方案分析、挖土方案设计，总结出了对在周围环境下的基坑工程设计施工有实际意义的结论。 关键词：深基坑；开挖方法；周围环境；影响因素  Abstract With the development of urban construction and reconstruction, the project of foundation pit goes into lager scale and depth. Especially in ningbo ,because the subsoil is soft,and the surroundings is very complex.So excavation method is very important for engineers. Therefore,how seeking the rational method in diffient surroundings is very possible. In the present paper,some cases of excavation summarized, the frequentiy processes and principle of Ningbo analysed , the influnce factor of excavation studied. And according to the practical project, the excavation plan analysed and designed.Finally, some conclusions which are valuable for design and construction of foundation pit obtained. Keywords: foundation pit；excavation method；surroundings；influence factor 目 录 PAGE PAGE 29 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc262513404 摘要 PAGEREF _Toc262513404 \h I HYPERLINK \l _Toc262513405 Abstract PAGEREF _Toc262513405 \h II HYPERLINK \l _Toc262513406 1. 绪论 PAGEREF _Toc262513406 \h 1 HYPERLINK \l _Toc262513407 1.1 研究意义 PAGEREF _Toc262513407 \h 1 HYPERLINK \l _Toc262513408 1.2 国内外研究现状 PAGEREF _Toc262513408 \h 1 HYPERLINK \l _Toc262513409 1.3 主要研究内容 PAGEREF _Toc262513409 \h 3 HYPERLINK \l _Toc262513410 1.3.1软土地区常见土方开挖方法及影响开挖方法选择的因素分析 PAGEREF _Toc262513410 \h 3 HYPERLINK \l _Toc262513411 1.3.2常见典型周围环境下的深基坑土方开挖方案分析 PAGEREF _Toc262513411 \h 3 HYPERLINK \l _Toc262513412 1.3.3常见典型周围环境下的深基坑土方开挖方案分析 PAGEREF _Toc262513412 \h 3 HYPERLINK \l _Toc262513413 2. 软土地区常见基坑土方开挖方法及影响因素分析 PAGEREF _Toc262513413 \h 4 HYPERLINK \l _Toc262513414 2.1 宁波软土特点 PAGEREF _Toc262513414 \h 4 HYPERLINK \l _Toc262513415 2.2 基坑土方开挖遵循的原则 PAGEREF _Toc262513415 \h 5 HYPERLINK \l _Toc262513416 2.3 软土地区常