丝绸大厦深基坑支护设计
摘 要
本设计是丝绸大厦的基坑支护设计。地基土层主要由素填土、淤泥质粘土、粉质粉土、粉质粘土构成。地形为坡地，局部为水塘。由人工推填平整，场地较平整。原始地貌为侵蚀性堆积岗地。
主体基坑支护采用分两侧采用不同的支护体系支护：一种是钻孔灌注桩加锚杆的支护体系，采用钻孔灌注桩的基坑开挖深度为9m，总桩长13m；一种是土钉墙支护，基坑开挖深度10m。基坑采用深层搅拌桩止水，排水沟排水。土层锚杆作为一种新兴科学，将会更广泛地运用到工程实践中，其具有较高的科学性、使用性，且施工方便，不占场地。
设计的主要内容有支护方案的选择、钻孔灌注桩的设计与计算、土钉及锚杆的计算、基坑的止水和施工组织设计和概预算。
关键词：深基坑支护；土钉墙；钻孔灌注桩；深层搅拌桩；锚杆支撑；施工组织设计；概预算。
Silk Building’s Pit Support Design
Abstract
The design is the hole excavated for building foundation supports and protections design of the silk building. The foundation soil is primarily made of foundation-filling soil,mud clay, silty silt, silty clay.This terrain is covered with slopes,and some parts are reservoirs. It is pushed to be smooth Artificially, and the venue is a formation. Primitive landform of it is a corrosive stack hillock place.
The main body of the hole excavated for building foundation supports and protections use different supports and protections systems to support and protect from two sides. One kind is the supports and protections system by useing the drill hole filling pile added with the anchor rod.The excavation depth of the structure is 9m, and the total length of the pile is 13m . Another way is the use of earth nail wall supports and protections,and the excavation depth of the structure is 10m. The hole excavated for building foundation uses the in-depth agitation pile to stop water and the drain to drain water . The soil layer anchor rod will be used in the project practice more widely as one emerging science, and it will be of higher scientific nature, use nature, and it will be constructed conveniently and it will not occupy the location.
Primary coverage of the design contains the choice of the supports and protections plan, the design and the computation of the drill hole filling pile, the computation of the earth nail and the anchor rod, the water stopping of the hole excavated for building foundation,the construction organization plan and budgets generally.
Keywords: Deep hole excavated for building foundation supports and protections; Earth nail wall; Drills a hole the filling pile; In-depth agitation pile; Anchor rod support; Construction organization plan; Generally budget.
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目 录
第1章 设计方案综合说明 ........................................................................................................................... 1 1.1 设计任务 ............................................................................................................................................... 1 1.1.1 本设计为基坑工程 ...................................................................................................................... 1 1.1.2 基坑工程设计图纸要求 ............................................................................................................... 1 1.1.3 针对性设计专题在论文的相应章节详细论述 ........................................................................... 1 1.2 原始资料 ............................................................................................................................................... 1 1.2.1 工程概况 ....................................................................................................................................... 1 1.2.2 基坑周边环境条件 ....................................................................................................................... 2 1.2.3 岩土层分布特征 ........................................................................................................................... 2 1.2.4 基坑侧壁安全等级及重要性系数 ............................................................................................... 3 1.3 设计依据 ............................................................................................................................................... 4 第2章 支护体系方案的选择 ....................................................................................................................... 5 2.1 支护体系的组成 .................................................................................................................................. 5 2.2 基坑支护结构的选择 .......................................................................................................................... 7 2.3 支护方案的比较和确定 ...................................................................................................................... 9 2.4 总结.................................................................................................................................................... 10 2.4.1 各土层的计算参数 ................................................................................................................... 10 2.4.2 计算区段的划分 ....................................................................................................................... 10 2.4.3 计算方法 ................................................................................................................................... 11 2.4.4 方案确定 ................................................................................................................................... 11 第3章 BC断面的围护结构设计与计算 .................................................................................................... 12 3.1 土压力系数计算 .............................................................................................................................. 12 3.2 支护结构设计计算 ............................................................................................................................ 12 3.2.1 侧向土压力计算 ....................................................................................................................... 12 3.3 锚杆设计的内容和步骤 .................................................................................................................... 17 3.3.1 锚杆承载力的计算 ................................................................................................................... 18 3.4 桩的配筋 ................................................................................................................................................. 21 3.4.1 桩体的配筋计算方法 ............................................................................................................... 21 3.4.2 构造配筋 ................................................................................................................................... 22 3.5 冠梁设计 ............................................................................................................................................. 23 3.6 腰梁设计 ............................................................................................................................................. 23 第4章 基坑的稳定性验算 ......................................................................................................................... 25 4.1 概述.................................................................................................................................................... 25 4.2 验算内容 ............................................................................................................................................. 25
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4.3 验算方法及计算过程 ......................................................................................................................... 25 4.3.1 基坑的整体抗滑稳定性验算 ..................................................................................................... 25 4.3.2 基坑抗倾覆稳定性验算 ............................................................................................................. 25 4.3.3基坑抗隆起稳定性验算 .............................................................................................................. 27 4.3.4抗渗流（或管涌）稳定性验算 .................................................................................................. 29 第5章 (AB.AD.DC)断面的围护结构设计与计算 .................................................................................... 32 5.1 土钉概述 ............................................................................................................................................. 32 5.2 土钉墙设计内容 包括 ........................................................................................................................ 32 5.2.1 方案确定 ................................................................................................................................... 32 5.2.2 土钉计算 ..................................................................................................................................... 33 5.2.3 结构计算 ................................................................................................................................... 37 第6章 基坑止水设计 ................................................................................................................................. 39 6.1 方案选择 ............................................................................................................................................ 39 6.2 基坑止水方案设计 ............................................................................................................................ 39 6.2.1 止水桩长确定 ........................................................................................................................... 39 6.3 排水设计 ............................................................................................................................................ 39 6.3.1 排水方案设计 ........................................................................................................................... 39 第7章 监测方案 ......................................................................................................................................... 40 7.1 基坑监测 ............................................................................................................................................ 40 7.1.1 位移观测 ................................................................................................................................... 40 7.1.2沉降监测 ...................................................................................................................................... 40 7.2 观测精度及技术要求 ......................................................................................................................... 40 第8章 施工组织设计 ................................................................................................................................. 43 8.1 主要施工顺序 ..................................................................................................................................... 43 8.2 主要配备 ............................................................................................................................................. 43 8.3 施工工期与进度计划 ........................................................................................................................ 45 8.3.1 组织管理机构 ........................................................................................................................... 45 8.3.2 施工准备 ..................................................................................................................................... 46 8.4 施工方法、施工工艺及技术措施 .................................................................................................... 47 8.4.1 主要分项工程施工方法 ........................................................................................................... 47 8.4.2 施工工艺 ..................................................................................................................................... 48 8.4.3 主要技术措施 ........................................................................................................................... 50 8.5 质量保证措施 .................................................................................................................................... 51 8.5.1 工程质量目标 ........................................................................................................................... 51 8.5.2 土方工程质量要求 ..................................................................................................................... 52 8.5.3 土钉墙施工注意事项及质量要求 ........................................................................................... 52 8.6 环保管理及措施 ................................................................................................................................ 54
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8.6.1 环境目标 ................................................................................................................................... 54 8.6.2 环境指标 ................................................................................................................................... 54 8.6.4 环境控制措施 ........................................................................................................................... 55 8.7 安全防火管理 .................................................................................................................................... 56 8.8 工程监测与信息施工 ......................................................................................................................... 57 8.9 技术资料管理 ..................................................................................................................................... 58 8.9.1 工程归档资料 ........................................................................................................................... 58 8.9.2 资料收集整理要求 ................................................................................................................... 59 8.9.3 资料保证措施 ........................................................................................................................... 59 第9章 概预算 ........................................................................................................................................... 60 9.1 工程量的计算 .................................................................................................................................... 60 9.2 工程预算书 ......................................................................................................................................... 61 9.3 工程总造价 ........................................................................................................................................ 65 结束语 ............................................................................................................................................................. 66 参考文献 ......................................................................................................................................................... 67 致 谢 ......................................................................................................................... 错误！未定义书签。