摘要工程为东亭花园小区基坑开挖工程，基坑围护结构型式采用灌注桩。该项目位于韩泰路以西，珠海路以南。拟建物为多栋地下一层的框架结构，建筑最大开挖深度约为5.00m,为三级基坑。

结合本工程地质、环境、挖深等诸多因素确定安全可靠的支护方案——灌注桩，它的支护形式属于边坡稳定式的一种，工程主要做法是通过现场的机械钻孔、钢管挤土或人力挖掘等手段在地基土中形成桩孔，然后在坑内放置钢筋笼、通过灌注混凝土做成灌注桩，通过灌注桩起到的主动嵌固作用，增加边坡的稳定性，从而使得基坑开挖后坡面保持稳定。50946

本设计首先对基坑工程做了一定的概述，然后对本设计的围护体系进行了详细的计算与设计，其中主要对土压力的计算，边坡稳定性验算等，桩长的计算，配筋的验算。

毕业论文关键词：基坑；灌注桩；结构计算；稳定性验算

  Abstract The garden district of dongting, works for the underground garage foundation excavation, foundation soil nail retaining wall structure type used. The project is located in the hantai road west, south of zhuhai road, Proposed content for underground frame structures, building excavation depth is about 5.00 m, the largest for level 3 of foundation pit.

Combined with the engineering geology, environment, dig deep, and many other factors to determine the safety and reliability of supporting schemes - pile, it is a kind of the slope stability type support, refers to the construction site by mechanical drilling, steel tube compaction or formed in the human mining method in the foundation soil of pile hole,and placed in them made of reinforcing cage, pouring concrete and pile, it is active build-in effect, increase the stability of slope, the slope is stable after excavation.

The design is first to do a certain amount of excavation overview, and then on the design of the envelope system for a detailed calculation and design, mainly on calculation of soil pressure, soil nail tension calculations, checking internal and external stability and dewatering well Design and calculation.

Key words: foundation; soil nail wall; structure calculation; Stability Checking

 目 录

第一章  设计方案综合说明 10

1.1 概述 10

1.1.1 工程概况 10

1.1.2 基坑周边环境条件 10

1.1.3 工程水文地质条件 10

1.1.4 基坑侧壁安全等级及重要性系数 14

1.2 设计总说明 14

1.2.1 设计依据 14

1.2.2方案选择 14

第二章  施工要求及监测方案 16

2.1  基坑施工要求 16

2.2基坑监测 16

第三章 手算数据 17

3.1 设计计算 17

3.1.1地质计算参数 17

3.1.2计算区段的划分 17

3.1.3计算方法 18

3.1.4土压力系数计算 18

3.2  AB段支护结构设计计算 18

3.2.1土层分布 19

3.2.2土层侧向土压力计算 19

3.2.3土压力合力及作用点的计算：