1、 本本 科科 毕毕 业业 设设 计(论文)计(论文) 题题 目:深层搅拌桩支护某结构工程设计目:深层搅拌桩支护某结构工程设计 学学 院:资源与环境工程学院院:资源与环境工程学院 专专 业:地质工程业:地质工程 摘要摘要 深层搅拌桩具有无噪音、无振动、无污染、工效高及成本低等优点,是一种 新型基坑支护方式,因此,对不同形式下水泥土墙的稳定性研究具有重要意义。 本文概述了基坑支护中深层搅拌桩支护技术的发展及应用历史, 介绍了深层搅拌 桩的特性、作用机理及影响因素。为广州某一工程的基坑开挖进行深层搅拌桩支 护设计,并对该设计进行理论分析和计算。比较了不同嵌固深度对搅拌桩支护结 构稳定性的影响,并绘制
2、关系曲线,确定最优嵌固深度。得出以下几点结论: 1.对于软土地基而言,当开挖深度不超过 7m 时,较板桩支护等其他支护方 式而言,深层搅拌桩支护具有明显优势,因此对于这类基坑支护宜采用深层搅拌 桩支护。 2.当基坑土层含大量淤泥质软土时,深层搅拌桩支护结构的失稳主要受抗滑 稳定性和抗倾覆稳定性决定。 3.当基坑土层含大量淤泥质软土,且基坑附近有较高堆载时,增加深层搅拌 桩的嵌固深度和厚度对提高基坑支护结构的稳定性作用不显著, 因此这时宜配合 内撑或锚拉,组成混合支护结构对基坑进行支护。 4.当基坑土层含大量淤泥质软土,且基坑附近有较高堆载时,深层搅拌桩支 护结构的稳定性并不一定随嵌固深度的增加
3、而增加, 在某一范围内反而随着嵌固 深度的增加而减小。如本工程抗倾覆稳定性随着嵌固深度的增加而减小。 此外还提出深层搅拌桩的施工工艺、技术指标、质量控制及变形监测等合理 建议,对该设计进行经济分析。 关键词:关键词:基坑支护;深层搅拌桩;嵌固深度;基坑施工;技术指标 Abstract Deep mixing pile has no noise, no vibration, no pollution, high efficiency and low cost advantages, is a new type of foundation pit supporting method, theref
4、ore, the cement wall under the different forms of stability study is of great significance. This article summarizes the deep mixing pile supporting technology in the foundation pit supporting the development and application of history, the characteristic of deep mixing pile are introduced, action me
5、chanism and influence factors. For guangzhou a engineering excavation supporting design of deep mixing pile, and the theory analysis and calculation for the design. Compared the different depth of the built-in influence on mixing pile supporting structure stability, and map relation curve, determine
6、 the optimal nesting depth. The following conclusions: 1.For soft soil foundation, when the excavation depth of no more than 7 m, the sheet pile support and other supporting method for deep mixing pile has obvious advantages, so for this kind of foundation pit supporting with deep mixing pile. 2.When the soil containing large amounts of silt soft soil foundation pit, supporting structure of deep mixing pile buckling mainly by anti-sliding stability and resistance to overturni