论文部分内容阅读
沈阳地铁2号线某暗挖车站是国内首个采用管幕预筑法施工的地下工程,对该工法施工引起的地面沉降进行了监测,并建立了修正的Peck模型对沉降进行预测,结果表明:(1)管幕预筑隧道施工引起的地表沉降预测值与实测值基本吻合;(2)管幕预筑浅埋大断面隧道施工地表沉降表现为整体下沉特点,沉降值与地下结构基础的沉降值基本相等,控制管幕预筑隧道结构的墙脚下沉可以有效控制地表的沉降;(3)管幕预筑法隧道施工预先施作的地下永久结构对隧道围岩的约束作用明显,砂土地层中地层损失率为0.000 5%～0.002 0%,沉降槽宽度系数为0.5;(4)管幕预筑法建造地下空间,引起的地表沉降较常规施工方法小得多,环境效益和社会效益明显,该施工方法适用于修筑中心城区软土地层中地下交通枢纽工程及下穿交通干线的隧道工程,值得进一步研究和推广。
Shenyang Subway Line 2 underground excavation station is the first underground construction using pipe curtain construction method of the construction method of the ground subsidence was monitored and the establishment of a modified Peck model to predict the settlement, the results show that : (1) Prediction values of surface subsidence caused by construction of pipe curtain precasting tunnel basically agree with measured values; (2) Surface subsidence of pipe-embedded prefabricated shallow large-section tunnels shows the characteristics of global subsidence, settlement value and foundation of underground structures And the settlement of the pre-built tunnel structure can effectively control the settlement of the ground surface. (3) The pre-built underground permanent structure of the pipe curtain prefabricated tunnel construction has obvious restraining effect on the surrounding rock of the tunnel, The loss rate of formation in the sand stratum is 0.0005% -0.002 0%, and the width coefficient of the settler is 0.5. (4) The construction of the underground space by the curtain curtain construction method causes the settlement of the ground surface to be much smaller than the conventional construction method. The environmental benefit and The social benefits are obvious. The construction method is suitable for the construction of the underground transportation hub project in the soft ground in the central urban area and the tunnel project under the traffic trunk line, which deserves further study and promotion.