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摘要随着中国经济的飞速发展，空间需求不断增大，而在城市中，人多地少，寸土寸金，因此建筑物在向高空发展的同时，地下空间的利用也成为了大势所趋，地下室，地下商场，地下车库，地铁车站等工程开始频繁出现，因此产生了大量深基坑，而深基坑的施工必然涉及到基坑支护。另外，高楼大厦也需要基坑支护来确保深基坑工程的安全顺利运行，因此，对于基坑支护的研究是必须的。50881
本设计中的黄浦置业北楼位于镇江市北部，坐落在长江与古运河十字水道旁，设有一层地下室，基坑开挖深度4.0m。本基坑选择了钻孔灌注桩的支护体系，并采用了深层搅拌桩止水，对桩及支撑的几何参数进行了设计计算，并进行了基坑的稳定性分析验算。
除此之外，考虑到了地下水对施工的影响，还选择了合理的降水工艺。本工程采用的是轻型井点降水法降低地下水位。
毕业论文关键词：基坑 支护 钻孔灌注桩 降水
Abstract With the rapid development of Chinese economy, the demand of space is increasing, but there are so many people live in the city, so 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. Because of the frequently occur of the basement, underground garage, underground shopping malls, subway station engineering and so on, a large number of deep excavation projects is appearing. On the other hand, the appearance of the deep excavation projects inevitably involves the support of excavation pit. Many-storied buildings also need the support of excavation pit to ensure the safety and smooth operation of the deep excavation projects. Therefore, the study of the support of excavation pit is a must.
The design of the Huangpu house purchase’s north building is located in the northern city of Zhenjiang, located in the side of the cross channel of Yangtze River and the ancient canal, with one basement. The depth of the building foundation pit is 4.0 meters. We take the bored piles support system. 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 precipitation
目 录
第一章 绪论1
1.1 引言1
1.1.1 基坑支护工程的特点1
1.1.2 深基坑支护的发展趋势2
1.1.3 我国深基坑工程存在的主要问题3
1.2 灌注桩的分类3
1.3 灌注桩质量预防4
1.4 本次选题的目的和意义5
1.4.1 选题的目的5
1.4.2 选题的意义6
第二章 方案介绍-7
2.1工程简况7
2.2 场地地形、地貌、地质构造7
2.3 地层结构7
2.4 地下水8
2.5 支护方案设计8
2.5.1 设计思路8
2.5.2 排、降水设计9
2.5.3 支护方案设计9
2.6 其他说明9
2.7 设计依据9
第三章 围护体系计算分析说明-10
3.1 基坑围护方案设计参数说明-10
3.1.1 土层指标参数-11
3.1.2 地面堆载 取值11
3.1.3 计算区段划分-11
3.1.4 开挖工况安排-11
3.2 土压力的计算方法简介-11
3.2.1 概述-12
3.2.2 支护结构土压力计算理论-12
3.2.3 土压力及其作用位置计算-14