砂石换填地基施工方案
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泸州职业技术学院
建筑工程系
××××房建工程砂石换填地基
施
工
方
案
专业
班级
姓名
指导教师
二〇一二年三月十九日
目录
第一章编制依据 ······················································错误!未定义书签。第二章工程概况 ······················································错误!未定义书签。第三章软土地层开挖施工方法 ····································错误!未定义书签。
3.1软土基坑人工边坡形式·······································错误!未定义书签。
3.2换填地层和深度的确定·······································错误!未定义书签。
3.3软土基坑几何尺寸的确定····································错误!未定义书签。
3.3.1 换填砂石层的厚度···················································错误!未定义书签。
3.3.2 换填砂石层底的宽、长度·······································错误!未定义书签。
3.3.3 软土基坑底的几何尺寸···········································错误!未定义书签。
3.3.4 软土基坑上口几何尺寸···········································错误!未定义书签。
3.4软土基坑的土方开挖量计算·································错误!未定义书签。
3.5开挖方法及开挖施工机具····································错误!未定义书签。
3.6基坑放线 ·························································错误!未定义书签。
3.7基坑验槽 ·························································错误!未定义书签。第四章砂石土料的开挖施工方法 ·································错误!未定义书签。
4.1砂石土料需要量 ················································错误!未定义书签。
4.2挖掘机具 ·························································错误!未定义书签。第五章换土层回填施工方法 ·······································错误!未定义书签。
5.1压实方法及压实机械 ··········································错误!未定义书签。
5.2压实施工 ·························································错误!未定义书签。第六章施工安全 ······················································错误!未定义书签。第七章施工进度 ······················································错误!未定义书签。第八章准备工作 ······················································错误!未定义书签。第九章质量要求与控制 ·············································错误!未定义书签。第十章环境保护措施······························································错误!未定义书签。
××××房建工程砂石换填地基施工方案
第一章编制依据
《混凝土结构工程施工质量验收规范》（GB 50204-2002）
地质勘察报告
《建筑地基基础工程施工质量验收规范》（GB50202-2002）
《混凝土泵送施工技术规程》JGJ/T 10-95
《建筑地基处理技术规范》（JGJ79-2002）
《国家建设标准设计图集》（03G101-1）
《建筑机械使用安全技术规程》（JGJ33-2001）
第二章工程概况
第三章软土地层开挖施工方法
3.1 软土基坑人工边坡形式
因该被开挖地层为杂填土和粉土，主要是杂填土，因此采取放坡开挖，不作支护。
3.2 换填地层和深度的确定
本工程的建筑物高度不等，建筑荷载大小不同，建筑荷载传至基底的压力约1500Kpa－3000Kpa，按最大荷载设计。
根据地层承载力情况和地层自身的性质情况，拟将杂填土换出，即将其开挖后，回填砂石土层，并碾压密实，形成人工地基。同时考
虑与之相接触的下层粉土情况，因此软土换出的开挖深度暂定4.50m。
3.3 软土基坑几何尺寸的确定
3.3.1 换填砂石层的厚度
按换填砂石地层的相关经验，其厚度不超过3.00m，本工程因基底压力较大，因此换填砂石地层厚度取3.00m。
3.3.2 换填砂石层底的宽、长度
根据给定的资料，筏板基础大体为矩形，考虑荷载传递，其长度99.00m，宽度28.00m。
按b/z＝3.00/28.00＝0.107＜0.25，且本工程的杂填土主要由碎石、瓦砾和少量腐植物质组成，因此查相关资料，该地层的应力扩散角取Θ＝20°。
据此计算换填砂石层底的宽Ｂ＝28+3×tan20°＝30.00m，长度Ｌ＝99+3×tan20°＝101.00m。
3.3.3 软土基坑底的几何尺寸
软土基坑底的宽度Ｂ1＝30+2＝32m，长度Ｌ1＝101+2＝103m。
3.3.4 软土基坑上口几何尺寸
被开挖的软土层主要是杂填土，且在坑内作业，查相关资料，其坡度系数应为0.33。因此，软土基坑上口宽度Ｂ2＝Ｂ1+0.33×Ｈ＝