深基坑双排支护桩的计算方法研究

Study on Calculation Method of Double Row Retaining-Piles for Deep Pits

运用改进的m法a理论,将双排桩的前排桩和单排桩的计算坐标原点取在坑底处,后排桩的计算坐标原点取在桩顶;局部土体破坏面与水平面的夹角η的关系式通过试算确定。通过室内模型试验,得到以下结论:双排桩比单排桩至少可减少造价23%,同时具有良好的抗变形性能,值得继续研究以便于广泛应用于各种支护工程中。

The method of structural mechanics and the improved“m a theory”were applied to he cal-culation of the double row retaining piles in foundation pit. The perfect“m a theory”uses the founda-tion pit as the calculation origin of coordinates of the single row pile and the front row pile of the double row retaining piles and the top of back row pile of the double row retaining piles as the calcu-lation origin of coordinate of the back row pile. the angleηrelationship between local soil failure sur-face and horizontal plane were determined by pilot calculation. The laboratory model test resulted in following results:The double row piles can reduce engineering cost by 23% at least compared by the single-row pile and have strong capability of resisting deformation, Therefore it is worthy of further research and can be widely used in all sorts of support engineering.