沿海滩涂地区深基坑支护技术.pdf

2010年5月 施工技术 第39卷第5期 CONSTRUCTION TECHNOLOGY 47 沿海滩涂地区深基坑支护技术 王强 (东北电业管理局第二工程公司，辽宁大连112000) [摘要]华能营口热电厂翻车机室工程距渤海沿海大堤不到1km 淤泥层厚度大，属于典型滩涂工程，对基坑支护 要求高.现场采用钻孔桩和土钉墙支护相结合的联合支护方法.通过钻孔柱配合错索、腰梁联合受力，土钉墙采 用错杆、喷锚网、喷射混凝土方式.基坑变形监测结果表明，基坑整体边坡稳定，土钉墙及支护桩变形在控制范围 内，保证了基坑安全. [关键词]基坑支护；滩涂；钻孔桩；土钉墙；监测 [中图分类号]TU753.1 [文献标识码]A[文章编号]1002-8498(2010)05-0047-03 Support Technology of Deep Foundation Excavation in Coastal Beach Area Wang Qiang The Second Engineering Company of Northeast Power Management Bureau Dalian Liaoning 112000 China) Abstract:The foundation support of car damper in Huaneng Yingkou Powerplant is difficult to construct because it is less than 1 kilometer from embankment of Bohai and the silt layer is very thick.The deep foundation excavation is supported with bored piles and soil nailing wall.The bored piles bining with cables and beams act as main bearing members.Reinforced mesh and shotcrete are set among anchors to form soil nailing wall.The monitoring results show that the foundation slope is stable and deformation of soil nailing wall and support piles can be controlled.Thus the safety of foundation excavation is ensured. Key words:foundation excavation support;beach;bored pile;soil nailing wall;monitoring 1工程概况 各部分开挖标高如图1 华能营口热电厂翻车机工程厂址原为一废弃盐所示（自然地面标高 滩，距渤海沿海大堤不到1km 地质条件极差，淤泥质-1.00m). 土厚度达8~14m 多呈软塑或流塑状态，属于典型滩2地质条件 涂工程.该深基坑对支护要求极高，现场采用钻孔柱 根据岩土工程勘 和土钉墙支护相结合的联合支护方式.钻孔桩配合锚测报告，厂区内地层为 索、腰梁联合受力；土钉墙采用错杆、喷锚网、喷射混凝第四纪河口~滨海相 土的方式，使结构处于最佳受力状态，通过监测，基坑沉积物，其中粉细砂、 图1基坑平面 侧壁稳定，变形较小. 粉土层为较好的含水...