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摘要由于经济的发展加上人类对居住条件的提高，近些年，我国建筑工程得到飞快的发展。在各大城市中，寸土寸金。所以在建筑向高层方向发展的同时，充分利用地底空间也成为了主要的发展方向。高层建筑的地下室，地下车库，地下商城等工程，都将面临的是深基坑工程问题。52534
基坑工程是一个古老而具有时代特点的岩土工程课题。基坑支护为保证地下结构施工及基坑周边环境的安全，对基坑侧壁及周边环境采用支挡、加固与保护措施。根据不同的地质情况与现场边界条件，开挖时基坑工程的支护形式多种多样。常用到的有：水泥土墙围护结构、排桩支护、钻孔灌注桩、钢板桩、地下连续墙和土钉墙等。通过对比分析各种支护方案，在本次设计中对-4.5m深基坑选择了钻孔灌注桩，并采用深层搅拌桩止水，就桩及支撑的几何参数进行设计计算，并进行基坑和稳定性分析验算。
考虑到地下水对施工组织的影响，所以选择合理了的降水工艺。本工程采用轻型井点降水法。
毕业论文关键词： 基坑 支护 钻孔灌注桩 稳定性 降水
Abstract China's construction, municipal and other works have reached rapid development with the economic development and the improvement of the people living environmental requirements in recent years. And the price of ground is very high in the cities. Hence in the development of the building are towards to high stories, at the same time, the use of underground space has become an important development direction. High-level and multi-storey building in the basement, underground garage and subway station and so on ,construction of the engineering will face deep foundation pit projects.
Excavation engineering is an ancient geotechnical engineering subject whicth has times features,sloping excavation and simple stake palisade .To ensure the safety of the underground structure construction and the surrounding environment of foundation pit,foundation pit suporting use the measures of retaining environment.According to different geological conditions and site boundary conditions,the support form of excavation engineering is varied,commonly used are: cement-soil retaining structure,row pile supporting,bored piles,steel sheet pile,artificial dig-hole pile,undergroud continuous wall and soil nailing support,etc.
Compared and analyzed the various support methods, in this design, which the pit is -4.50 m deep, we take the bored piles . In order to stop water , we take the deep mixing pile。Design and calculate the geometric parameters of the pile and anchor, analysis and check the pit stability.
In addition, taking into account the impact of underground water on the construction, it will need a reasonable choice of the precipitation process. The design applied the light well point precipitation method to reduce the level of groundwater.
Keywords：pit support bored piles stability precipitation
目录
第一章 绪论 1
1.1 引言 1
1.1.1 基坑支护工程的内容 1
1.1.2 基坑支护技术的现状 2
1.1.3 深基坑支护技术的发展趋势 5
1.1.4 深基坑工程存在的主要问题 5
第二章 设计方案综合说明……..6
2.1 概述 6
2.1.1工程概况 6
2.3 方案介绍 8
2.4 方案选定 9
第三章 基坑支护结构设计计算书