地基处理工程设计概述

目录

1工程概况 (1)

1.1 建筑工程概况 (1)

1.2 场地条件 (1)

1.2.1 场地环境 (1)

1.2.2 场地地质构造及地震烈度 (1)

1.3 水文与气象 (1)

1.4 工程地质条件 (2)

2方案选择与论证及相关技术国内外现状 (3)

2.1 设计要求 (3)

2.2 方案的选择 (3)

2.3 方案的论证 (3)

2.3.1 CFG桩方案的论证 (4)

2.3.2 碎石桩方案的论证 (4)

2.3.3 水泥土搅拌桩方案的论证 (4)

2.4 地基处理国内外现状与发展趋势 (5)

2.4.1 CFG桩国内外现状 (5)

2.4.2 碎石桩国内外现状 (6)

2.4.3 水泥土搅拌桩国内外现状 (6)

3 方案的设计计算及最佳方案选择 (7)

3.1 CFG桩的设计计算与工程预算 (7)

3.1.1 CFG桩的设计计算 (7)

3.1.2 CFG桩的工程预算 (15)

3.2 碎石桩设计计算与工程预算 (16)

3.2.1 碎石桩的设计计算 (16)

3.2.2 碎石桩的工程预算 (22)

3.3 水泥土搅拌桩的设计计算与工程预算 (23)

3.3.1 水泥土搅拌桩的设计计算 (23)

3.3.2 水泥土搅拌桩的工程预算 (30)

3.4 地基处理最佳方案选择 (32)

4 方案的优化设计计算 (32)

4.1 CFG桩优化设计 (32)

4.1.1 参数的设计 (32)

4.1.2 桩身混凝土强度确定 (35)

4.1.3 褥垫层厚度 (35)

4.1.4 沉降计算 (35)

4.1.5 软弱下卧层验算 (37)

4.1.6 方案优化前后工程量对比 (39)

4.2 程序设计 (40)

5施工方案 (41)

5.1 CFG桩施工方案 (41)

5.1.1 施工机械 (41)

5.1.2 施工流程及施工顺序 (41)

5.1.3 褥垫层铺设 (44)

5.1.4 施工要点及质量控制标准 (44)

5.1.5 施工中应注意的问题 (46)

5.2 资源需求量 (47)

5.2.1 主要施工机械、设备 (47)

5.2.2 材料计划 (48)

5.2.3 劳务计划及工程进度计划 (48)

5.3 施工组织管理 (49)

5.3.1 施工人员组织管理 (49)

5.3.2 安全及文明施工保证措施 (49)

6施工质量监测 (50)

6.1 CFG桩检测目的 (50)

6.2 检测数量 (51)

6.3 检测方法 (51)

6.3.1 超声波法检测桩的完整性 (51)

6.3.2 静荷载试验法测桩承载力 (54)

6.4 CFG桩施工质量监测结论 (56)

7主要工作及创新点 (56)

7.1 主要工作 (56)

7.2 创新点 (57)

参考文献

谢辞

附录

摘要

拟建工程为米易县商会大厦，地处米易县城北新区，与攀西大酒店隔路相对，有安宁路直通场地，交通方便，地势较为平坦。拟建大厦为21层框剪结构，1层地下室，占地面积2244㎡。要求地基处理后，复合地基承载力达到350kpa，沉降小于50mm。

根据场地地质和水文条件做出了三种地基处理方案，分别是:碎石桩法，水泥土搅拌桩法，CFG桩法，经设计计算，三种施工方案都满足上部荷载的要求。均可进行加固处理该场地地基。

经过初步对比,从设计方案的各项经济技术要求和周边情况综合考虑，决定采用CFG桩法加固处理改良地基。经过一系列的设计计算，采用CFG桩直径为400㎜，有效桩长8.0m，桩间距 2.0m，共施工600根桩，总造价为317088.38元，沉降小于50mm，计划工期为42天。同时本文还介绍了CFG桩的参数设计、施工设备、施工工艺和质量检测标准。

CFG桩具有承载力高、沉降量小和工程费用低等优点，得以广泛采用，并取得良好的经济和社会效益。

关键词

地基处理 CFG桩水泥土搅拌桩碎石桩

Abstract

The proposed works is Miyi county chamber of commerce building and it is located at the north of town newly developed area, with the Panxi hotel different relative, There has the Anning road which can through the site. the transport is

convenient and the topography is smoother. The proposed chamber of commerce building is a frame-shear wall structure of the 21-storeys,with a layer basement,and the size is 2244㎡. after the soil treatment, the bearing capacity need reach 350 kPa, and the settlement should be less than 50mm.

According to the geological and hydrological conditions, it made three soil treatment plans : gravel piles, cement mixing pile, CFG pile. Through designed, the three construction options can meet the requirements of the upper load,so it can be reinforced to deal with the foundation of the site.

After a preliminary comparison, from the designed program of economic and the technical requirements of the surrounding circumstances which is considered, It decided to adopt the CFG pile to reinforce the foundation . After a series of design and calculation, it uses the CFG pile,with 400㎜of the diameter, 8.0 meters of the effective pile length, 2.0 meters of the the pile spacing, and a total of 691 construction piles.the works that will be planed for the 42 days costs about 317,088.38 yuan, and the settlement is less than 50mm. Simultaneously this article also introduced the parameters design of CFG pile, the construction equipment, the construction technology and the quality standard of testing.

The CFG pile with a high bearing capacity , a small settlement and a low cost of the project can be widely used and achieved a good economic and social benefits.

Keywords:

soil treatment; cement Fly-ash gravel pile; cement mixing pile;gravel pile