本地区对于10m以上挖深、周边条件复杂的基坑主要采取双排灌注桩排桩结构或混凝土(钢)内支撑+三轴水泥土搅拌桩的支护形式。南通颐达商业广场基坑北侧临近中新二路(11.0m),距西侧在建建筑(多层商业,独立基础有地梁,3~4F框架柱距约7.4m,埋深约-1.4m)一般为17m,基坑挖深11.4m,采用的支护形式为击入式钢管土钉墙,坡率为1:0.6,未设置三轴水泥土搅拌桩止水帷幕。根据基坑开挖至回填的基坑周边巡视情况及基坑监测成果分析,本基坑坡顶及周边道路、建筑物沉降位移量基本在2cm以内,道路及周边建筑未发现开裂现象,本工程支护形式有效的解决施工工期短、方便土方开挖和结构的施工、节省工程造价的问题。值得周边类似工程借鉴。 In this area, the foundation pits with more than 10m excavation depth and complicated surrounding conditions mainly adopt double-row perfusion pile row piles structure or concrete (steel) inner support + triaxial cement soil mixing piles support form. Nantong Tiida Commercial Plaza pit near the north of the new road (11.0m), west of the building under construction (multi-storey commercial, independent foundation with beams, 3 ~ 4F frame column spacing of about 7.4m, a depth of about -1.4 m) is generally 17m, foundation pit excavation depth 11.4m, the use of the support form of pipe for the soil into the nail wall, the slope was 1: 0.6, not set three-axis cement mixing pile water curtain. According to the pit excavation to backfill around the pit inspection and pit monitoring results analysis, the top of the foundation pit and the surrounding roads, buildings settlement displacement of basic within 2cm, the road and surrounding buildings found no cracking phenomenon, the project Support form effectively solve the construction period is short, convenient earthwork excavation and construction of the structure, saving project cost problem. Worth surrounding similar projects for reference.