地下检票厅开挖对既有地铁换乘通道稳定性影响研究

为研究地下检票厅开挖过程中周边换乘通道的稳定性,建立地下检票厅开挖离散元数值模型,通过分析检票厅开挖后对换乘通道结构力学响应,揭示地下开挖对周边既有结构稳定性的影响。结果表明:检票厅开挖后将引起换乘通道产生附加位移,双洞室分别开挖的过程中,右侧洞室开挖对换乘通道的影响远远高于左侧洞室,左侧洞室开挖后其周边岩体的位移以左侧洞室为中心成对称分布,右侧洞室开挖后其周边岩体的位移大致以检票厅中柱为中心成对称分布;检票厅开挖后,换乘通道洞壁中心最大水平位移为1.9mm,顶板中心最大竖向位移为0.74mm,底板中心最大竖向位移为3.3mm。位移值在施工控制中均满足位移控制标准。

Study on infl uence of underground ticketing hall excavation on the stability of existing metro transfer passage

In order to study the stability of the surrounding transfer passage during the excavation of the underground ticket hall,this paper establishes a discrete element numerical model of the excavation of the underground ticket hall.By analyzing the mechanical response of the excavation of the ticket hall to the transfer passage structure,it reveals the influence of the underground excavation on the stability of the surrounding existing structure.The results show that the excavation of the ticketing hall will cause additional displacement of the transfer passage.In the process of double caverns excavation,the influence of the excavation of the right cavern on the transfer passage is much higher than that of the left cavern.After the excavation of the left cavern,the surrounding displacement is symmetrically distributed with the left cavern as the center,and the displacement of the surrounding rock mass is symmetrically distributed with the center column of the ticketing hall as the center.After the excavation of the ticketing hall,the maximum horizontal displacement of the transfer passage wall center is 1.9 mm,the maximum vertical displacement of the roof center is 0.74 mm,and the maximum vertical displacement of the floor center is 3.3 mm.The displacement values meet the displacement control standard in the construction control.