Based on the pile-bean-arc(PBA) method construction of Caihuying Station of Beijing Subway Line 14, the numerical calculation software was used to simulate the construction process of the station, and the calculating results were compared with the measuring data.The law of surface deformation caused by the PBA method was summed up, and the influence of different step lengths of excavation on the surface subsidence was analyzed.The results show that through the construction process, the settlement of pilot tunnel excavation can be accounted for over 85% of the total settlement, where the surface settlement caused by the guide tunnel excavation completed accounts for 55%.At the same excavation distance, the longer of excavation steps are, the greater of the surface subsidence is.%以北京地铁14号线菜户营车站洞桩法施工为工程背景,对施工全过程进行数值仿真计算,并与现场实测结果进行对比,总结洞桩法施工引起的地表变形规律,同时分析不同的台阶长度的开挖对地表沉降的影响.结果表明:在整个施工过程中,导洞开挖阶段引起的地表沉降约占总沉降的85%,其中上导洞开挖完成引起的地表沉降约占55%;在开挖距离相同时,台阶开挖长度越大,地表沉降越大.
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