摘要基坑工程是一门综合性很强的学科，它包括结构的强度和稳定性的计算。同时又受到地质及水文条件等环境因素的控制。另一方面，基坑支护结构是临时性构筑物，经济因素也是主导其合理性的重要方面。如何设计出安全、合理、可行的基坑设计方案，已然成为国内外建筑工程界共同的课题。51303

    本文主要介绍盐城新洋港大桥桥墩承台基坑支护设计过程。通过对基坑知识的学习与梳理，进行实例计算。首先选择施工方案采用SMW工法加一道钢管水平支撑方案,其次根据规范进行结构配筋及构件选择与稳定验算，然后整合计算书，最后绘制CAD图纸。

毕业论文关键词：基坑；支护；SMW工法

 ABSTRACT   Foundation pit engineering is a very complex subject, it includes the calculation of the structural strength and stability. At the same time is controlled by geological and hydrological conditions and other environmental factors. On the other hand, the retaining structure of foundation pit are temporary structures, economic factors are also leading the important aspect of rationality. How to design the foundation pit design safety, reasonable and feasible, has become a topic of common domestic construction engineering.

  This paper mainly introduces the design process of Yan Cheng Xin yang harbor bridge pier cap of foundation pit. By studying and reviewing the knowledge of the foundation, the example was calculted knowledge. First select the construction scheme using the SMW method with a steel pipe bracing scheme, followed by the structure reinforcement and component selection and stability calculation according to the specification, then integration calculation, finally rendering CAD drawings.

Keywords: excavation; support; SMW method

目  录

第一章 绪  论 1

1．基坑支护设计的发展概况 1

2．基坑支护设计的内容和目标 2

3．基坑支护设计中应注意的问题 2

4．本文章节安排 4

第二章 工程地质及水文地质资料 5

2.1工程概况及工程地质 5

2.1.1 一般概况 5

2.1.2 结构概况 5

2.2 工程周边环境 6

2.2.1建筑环境 6

2.3 设计依据和设计标准 7

2.3.1基坑工程设计依据 7

2.3.2基坑工程等级确定 8

2.4基坑设计控制原则 8

第三章 基坑维护方案设计 11

3.1支护体系的组成 11

3.2几种常见支护体系 11

3.2.1深层搅拌水泥土围护墙 11

3.2.2槽钢钢板桩 11

3.2.3地下连续墙 12

3.2.4 SMW工法(劲性水泥土搅拌桩法) 12

3.3方案对比分析及选择 12

3.3.1型钢选择 13

3.3.2水泥土搅拌桩 13

3.4基坑支撑方案设计 13

3.4.1支撑结构类型