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中文摘要：
结合西北地区深基坑支护设计经验,考虑安全和造价等因素,对西宁火车站综合改造工程总体项目原支护设计方案进行合理优化.将原方案一桩到底和框架格构梁加预应力锚索方案优化为上部土钉墙加下部排桩锚杆联合支护体系.上部通过采用坡度尽可能缓的土钉墙,卸除土体荷载,有效减小主动土压力;下部采用在桩身最大弯矩处局部加密配筋优化的桩锚支护结构,有效地控制基坑开挖过程中产生的变形,简化施工工序.
英文摘要：
Referencing to the experience of deep excavation retaining design adapted in the northwest region of this country and considering the factors such as its safety and cost etc,the original retaining design plan in the overall project of comprehensive reconstruction of Xining railway station was rationally optimized.The original plan and framework on a unique pile of prestressed anchor lattice beam plus a scheme was replaced by an upper soil nail wall plus a lower row pile anchor combined Support system.By using soil nailed wall with maximum upper slope,the soil load was decreased and the active earth pressure reduced.The lower combined support system with local encryption reinforcement pars set at the location of maximum bending moment in pile body was used to effectively control the excavation process distortion,simplifying the construction process.
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