土方开挖及回填施工方案...................................................................................................................2一、工程概况..................................................................................................................................71．场地位置及现状.....................................................................................................................................72．场地地质条件.........................................................................................................................................73．土方工程概况.........................................................................................................................................7二、基坑土方开挖施工..................................................................................................................71．施工准备.................................................................................................................................................72．施工分段与施工组织.............................................................................................................................83．土方开挖施工工艺...............................................................................................................................114．工程施工注意事项及对策...................................................................................................................12三、基坑内土方工程施工............................................................................................................131．施工准备...............................................................................................................................................132．施工操作工艺.......................................................................................................................................133．土方回填...............................................................................................................................................14四、土方回填施工........................................................................................................................141．施工准备...............................................................................................................................................142．施工工艺...............................................................................................................................................15五、质量保证措施........................................................................................................................171．土方开挖质量要求...............................................................................................................................172．方开挖质量控制重点及措施（见表3）............................................................................................173．土方开挖工程施工保证措施...............................................................................................................174．土方回填质量要求及保证措施...........................................................................................................18工程概况一、自然环境概述广州市位于东经112度57分～114度03分及北纬22度35分～23度35分之间，属南亚热带季风气候区，广州地处低纬...
