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根据当前基坑支护形式,将桩锚支护体系中的锚索用自旋锚管取代,设计合理的桩与自旋锚管的支护体系,并对该支护体系进行稳定性验算;此外,还利用有限差分法对该支护体系进行仿真模拟。在京石客运专线明挖段施工中采用这种支护形式,并在现场对桩顶沉降和锚杆锚固力的变化情况进行了监测,发现自旋锚管在安装一段时间之后其锚固力还会继续上升,桩体位移的最大值只有3.3mm。由此得出这种支护形式完全能够满足支护要求。
According to the current support form of foundation pit, the anchor cable in the supporting system of pile and anchor is replaced by the spinning anchor tube, and the supporting system of the pile and the spinning anchor pipe is designed, and the stability checking of the supporting system is carried out. In addition, the support system is simulated by finite difference method. This kind of support is adopted in the construction of bright-out section of Beijing-Shijiazhuang Passenger Dedicated Line. The settlement of the top of the pile and the change of the anchorage force of the anchor are monitored in the scene. The anchoring force of the spin-anchor pipe after installation for some time is also found Continue to rise, the maximum displacement of the pile is only 3.3mm. It can be concluded that this form of support can fully meet the support requirements.