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盾构技术在地下空间开发中得到广泛应用,保持开挖面稳定性是盾构施工的关键,但这方面的大尺寸模型试验研究一直很少。利用直径1 m的盾构模型,研究了干砂地层中不同埋深比(C/D=0.5,1.0,2.0)下盾构开挖面稳定性问题。试验中分析了埋深比对开挖面极限支护力及地表沉降的影响,揭示了开挖面稳定性与极限支护力及地表沉降的关系,提出同时监测控制开挖面土舱压力及地表沉降的重要性,并给出关键控制键参数。对确定开挖面极限支护压力有重要的指导意义。
Shield technology is widely used in the development of underground space. To maintain the stability of the excavation face is the key to shield construction. However, large-scale model tests in this area have been rarely studied. Using the shield model with a diameter of 1 m, the stability of shield tunnel face under different depth / depth ratio (C / D = 0.5, 1.0, 2.0) of dry sand is studied. The effect of burial depth ratio on the ultimate supporting force and surface subsidence of the excavation face was analyzed. The relationship between the stability of the excavation face, the limit support force and the settlement of the ground surface was revealed. Simultaneously, The importance of surface subsidence, and gives the key control key parameters. It has important guiding significance for determining the supporting pressure of excavation face limit.