1、某居民楼 CFG 桩地基加固设计 摘 要 地基处理的目的主要是提高地基强度和控制地基变形。 CFG 桩复合地基虽说是近些年 才发展起来的，但其施工速度快，建筑成本低，可调性、适合性、可靠性好，复合地基沉 降小，目前 CFG 桩复合地基在许多地区广泛应用。 根据建筑物场地的岩土工程勘察资料，论文对场地工程地质条件进行分析和评价和 CFG 桩复合地基的设计。设计的主要内容有有效桩长，桩径，桩间距，面积置换率，单桩 承载力，复合地基的承载力，桩体材料强度，并对沉降和倾斜进行了验算，以确保建筑物 的安全。 关键词：CFG 桩复合地基；地基承载力；地基变形 Abstract The main purpo
2、se of the ground treatment is to improve the strength and control of ground the deformation of ground. The engineering geological conditions is poor and the ground bearing capacity of natural base is not big enough, can be used CFG pile composite foundation reinforced. While CFG pile composite found
3、ation is only developed in recent years, but its speed of construction, building low-cost, adjustable, and the suitability, reliability, and composite foundation settlement small, the current CFG pile composite foundation widely used in many areas. According to the building site geotechnical enginee
4、ring investigation of the information， this paper analysis and evaluation the engineering geological conditions of the venue and design CFG pile composite foundation. The main elements of the design is effective pile length, pile diameter, pile spacing, covering an area of exchange rates, pile capac
5、ity, the bearing capacity of composite foundation, pile material strength, and the settlement and tilt were to ensure the safety of buildings . Keywords: CFG pile composite foundation; value of subsoil bearmg capaclty; foundation deformation 1 目 录 1 绪论 0 1.1 CFG 桩及其复合地基知识概述 0 1.2 CFG 桩加固机理 . 0 1.3 C
6、FG 桩复合地基处理技术现状 1 1.4 CFG 桩在复合地基中的优势 1 1.5 本设计的主要工作与设计思路 1 1.5.1 设计内容 2 1.5.2 设计思路 2 2 地基处理方案的选择 3 2.1 工程概况 3 2.2 场地地层岩性. 3 2.3 水文地质条件. 3 2.4 设计要求 4 2.5 地基处理方案的分析与优选 4 2.5.1 钻孔灌注桩方案 4 2.5.2 CFG 桩方案 . 4 2.5.3 地基处理方案的选择. 4 3 CFG 桩设计计算 . 6 3.1 设计依据 6 3.2 持力层及桩长. 6 3.3 桩径. 6 3.4 桩间距 . 6 3.5 CFG 复合地基置换率 7 3.6 桩数. 7 3.7 单桩竖向承载力特征值 R 8 3.8 复合地基承载力特征值. 9 3.9 混凝土桩体强度设计 9 4 变形验算 11 4.1 复合土层的压缩模量的确定. 11 4.2 基底平均附加压力. 11 4.3 复合地基沉降计算. 11 5 褥垫层的设计 .14 5.1 褥垫层的设置14 5.2 褥垫层作用 .14 5.3 褥垫铺设.15 6 CFG 桩施工 .16 6.1 C
