基坑开挖放坡方案设计详解

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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

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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

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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 GB50204-2015 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

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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①层Qnl），耕表土（第②层Qpd），坚硬状红黏土（第③层Qel），强风化白云质灰岩（第④层C2h），微风化白云质灰岩（第⑤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1：0.75～1：1.75， 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。

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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

2016年5月10开工，计划2016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±12√H ，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

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