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为了验证疏排桩锚—土钉墙水平联合支护结构的稳定、安全及可行性,得出桩、锚等结构构件的受力及变形规律,以北京京温市场二期地下车库基坑工程为例,分别构建了桩锚支护和疏排桩锚—土钉墙水平联合支护两种方案,然后对两种方案进行了数值模拟,并将以下方面的模拟结果进行了对比分析:基坑开挖面水平位移、地面沉降、各道锚杆的轴向受力规律及支护桩的受弯规律。模拟结果表明:当基坑土层适合土钉支护但开挖深度超过土钉支护深度时,采用疏排桩锚—土钉墙水平联合支护结构替代桩锚支护结构是稳定的、安全的、可行的。
In order to verify the stability, safety and feasibility of the horizontal combined support structure of pile-anchor-soil nailing wall, the force and deformation of structural members such as piles and anchors are obtained. With the foundation pit project As an example, two schemes of pile-anchor supporting and grouting-pile-anchor-soil nailing wall horizontal joint support are respectively constructed. Then the two schemes are numerically simulated and the simulation results in the following aspects are compared and analyzed: Horizontal displacement of pit excavation surface, land subsidence, axial load force of each bolt and bending law of supporting pile. The simulation results show that when the foundation pit soil is suitable for soil nailing support but the excavation depth exceeds the soil nailing support depth, the pile-anchor supporting structure is replaced by the horizontal combined support of the spilled pile and soil nailing wall, Safe and feasible.