洱海流域流砂地层下深基坑支护优化设计

Optimization design of deep foundation pit support under quicksand stratum in Erhai lake basin

以云南大理某污水处理厂工程为例,对其深基坑支护采用上部放坡+灌注桩(悬臂)+桩锚组合支护型式,止水帷幕主要为2道三轴水泥土搅拌桩+坑内双管高压旋喷桩加固方案进行设计验算,结果表明满足洱海流域流砂地层条件下深基坑支护需求,并将整个基坑变形、地下水位都控制在规范允许的范围内。

Taking a sewage treatment plant in Dali, Yunnan province as an example, the deep foundation pit is supported by a combination of upper slope-setting, cast-in-situ pile （cantilever） and pile-anchor, and the waterproof curtain is mainly composed of two triaxial cement-soil mixing piles and two-pipe high-pressure jet grouting piles. The results show that the reinforcement scheme meets the requirements of drifting sand stratum in Erhai basin. Deep foundation pit support needs, and the deformation of the entire foundation pit, groundwater level are controlled within the scope allowed by the code.