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针对广州南沙某写字楼工程场地实际情况,选取微型钢管桩重力式水泥土挡墙这一新型支护形式作为该工程基坑的支护方案,在对水泥土挡墙水泥掺入比取值、水泥土挡墙的平面尺寸、嵌固深度及微型桩的布置等进行分析研究的基础上确定最终的基坑支护设计方案。水泥土强度的试验结果及基坑施工过程中墙体水平位移等的监测结果表明该基坑设计方案是科学合理经济的。微型钢管桩重力式水泥土挡墙这一新型支护形式在本工程的成功应用为该复合支护形式在广东地区的推广应用起到了推动作用,也为类似工程的基坑设计提供了参考和借鉴。
According to the actual situation of an office space in Nansha, Guangzhou, the new type of supporting form of micro steel pipe pile gravity cement earth retaining wall is selected as the supporting plan of the foundation pit. The size of soil-cement retaining wall, the depth of embedment and the arrangement of micro-piles, etc. Based on the analysis and research, the final design scheme of foundation pit support is determined. The test results of cement-soil strength and the horizontal displacement of the wall during the construction of the foundation pit show that the design scheme of the foundation pit is scientifically reasonable and economical. The successful application of this new type of support for the mini-steel pipe pile gravity cement-soil retaining wall has promoted the application and popularization of the composite support form in Guangdong area and also provided a reference for the design of foundation pit for similar projects And learn from.