基坑开挖放坡方案设计详解.doc

基坑开挖放坡方案设计详解实用标准文案 目录 一、编制依据····················································3 二、工程概况····················································3 1、项目概况··················································3 2、地质地貌概况··············································4 3、设计概况 ·················································4 4、施工特点··················································4 三、施工安排····················································5 四、主要施工方法················································5 1施工测量···················································5 2施工流程···················································5 3护坡开挖方案···············································5 4排水方案···················································6 5土方开挖方案···············································6 6. 基坑开挖后成型图及边坡稳定性计算····························8 7、土方堆放····················································11 8、桩基础开挖·················································12 9、独立柱基础开挖·············································12 五、质量保证措施················································13 六安全保证措施················································14 1安全管理制度·················································15 2安全技术措施·················································15 精彩文档 实用标准文案 3施工防护管理·················································16 4施工用电·····················································16 5施工机械·····················································17 6、施工道路·····················································18 七、雨期施工····················································18 八、应急预案····················································19 1、突发事件应急准备···········································20 2、突发事件分析及应急预案·····································22 九、基坑监测监控················································23 十、文明施工、环境保护措施······································24 精彩文档 实用标准文案 一、编制依据 序名称 号 1 图纸 2 岩土工程勘察报告 3 建筑施工手册（第四版） 编号 备注 4 建筑地基基础工程施工质量验收规范 GB50202-2002 5 混凝土结构工程施工质量验收规范 6 建筑工程施工质量验收统一标准 7 建筑施工安全检查标准 9 施工现场临时用电安全技术规范 10 建筑地基基础设计规范 11 建筑施工土石方工程安全技术规范 12 建筑基坑工程监测技术规范 13 建筑机械使用安全技术规程 14 建筑基坑支护技术规程 GB50204-2021 GB50300-2013 JGJ 59-2011 JGJ46-2005 GB50007-2002 JGJ180-2009 GB50497-2009 JGJ33-2012 JGJ 120-2012 二、工程概况 1、项目概况 本工程为裕达·绿水仙城澳洲青青，位于来宾市武宣县城东新区，规划用地面积为30032.03，总建筑面积159763.50，其中1#7#楼设计为高 精彩文档 实用标准文案 层住宅楼，基础为桩基，8#11#楼设计为低层商铺，基础为独立柱基础。地下一层，地下室底部设计标高61.00m。 参建单位 建设单位：武宣裕达房地产开发有限公司 勘察单位：核工业桂林工程勘察院 设计单位：湘潭市规划建筑设计院 监理单位：广东广信建筑工程监理有限公司 施工单位：广西裕达工程有限公司 2、地质地貌概况 现场地已基本开挖至地下室底板，根据岩土工程施工勘察报告显示，本工程场地上覆土层土质情况自上而下主要为：杂填土（第层Qnl），耕表土（第层Qpd），坚硬状红黏土（第层Qel），强风化白云质灰岩（第层C2h），微风化白云质灰岩（第层C2h）。 3.设计概况 根据工程勘察院提供岩土工程勘察报告资料显示 ,基坑可放坡开挖，放坡系数可采用1：0.751：1.75， 结合地质及工程实际情况，本工程采用无支护土方，基坑放坡系数为1：0.75。 4. 施工特点 本工程占地面积较大，土方量较大，周边地面开阔，场地周边20m范围内无建筑物和地下管道，根据地质报告，场地地下水水量贫乏，土质较好。 土方采取放坡分层分级开挖，第一层开挖深度为3m，分为2级，每级1.5m，第二层开挖深度为3m，分为2级，每级1.5m，共计开挖深度为6m。 精彩文档 实用标准文案 排水采取基坑外排水和基坑内集排水。 三、施工安排 1施工进度 2021年5月10开工，计划2021年7月 15 完工。 2劳动力及机械组织 根据工程量及总体施工进度要求，计划安排挖土机5台，运土翻斗车10台，水泵4台，挖土机司机5名，运土车司机10名，普通工10人，施工队长一名，技术员一名；。项目安排专业技术负责人3名，质量员3名，安全员3名。 四、主要施工方法 1施工测量 该工程拟投入的仪器主要有经纬仪和自动安平水准仪、全站仪等。 在拟建建筑物四周布设四个水准点，作为建筑物沉降观测的依据，四个水准点闭合差应小于±12H ，场地整理及土方开挖时应保护好水准点。 2施工流程 开挖线放样第一步土方开挖第一步修坡开挖下一步土方下一步修坡直至基坑底。 3护坡开挖方案 （1）放线员用白灰撒好上坡线及下坡线，用于控制放坡角度。根据勘察报告内各土层、土质状况，采用1:0.75坡度放坡。 （2）由于基坑较深采用二阶开挖施工，第一阶段挖至3m深处，第二阶段挖 精彩文档 5 / 5