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以广州地铁站前停车线为工程背景,通过室内大比例相似模型试验,结合数值模拟计算,研究大断面浅埋地铁在上下台阶法不同开挖步骤中产生的洞周位移、地表和地层的位移响应。结果表明:通过相应的辅助工法和合理的施工工序,台阶法能有效控制上台阶开挖引起的洞周位移和地表沉降,从而控制整个隧道开挖对周边环境的影响,保证隧道快速、安全施工。
Taking the parking line in front of Guangzhou metro station as an example, large-scale similar model test and numerical simulation are carried out to study the displacement of the perimeter of the tunnel, the displacement of the ground surface and the formation during the excavation steps of the upper and lower steps of the large- response. The results show that the step method can effectively control the displacement of the tunnel and the settlement of the ground caused by the step excavation, and thus control the influence of the whole tunnel excavation on the surrounding environment and ensure the rapid and safe construction of the tunnel through the corresponding auxiliary methods and reasonable construction procedures .