曲线隧道盾构掘进引起地表变形模型试验研究  

Model Experiment Study on the Surface Deformation Caused by Shield Tunneling in Curved Tunnels

作　　者：徐平[1] 席丹辉 高强 Xu Ping;Xi Danhui;Gao Qiang(School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,P.R.China;School of Engineering,Zhengzhou Technology and Business University,Zhengzhou 451400,P.R.China;China Railway Fourth Engineering Group Co.,Ltd.,Hefei 230041,P.R.China)

机构地区：[1]郑州大学水利与交通学院,郑州450001 [2]郑州工商学院工学院,郑州451400 [3]中铁四局集团有限公司,合肥230041

出　　处：《地下空间与工程学报》2024年第S2期713-721,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51278467);中国铁道科学研究院基金(2022YJ280)。

摘　　要：相对于直线隧道,小半径曲线隧道进行盾构掘进施工引起的地表沉降变形更为复杂,现有经验公式无法对其变形规律进行较好地拟合。基于中原地区某地铁出入场线的盾构隧道工程,根据相似原理建立砂土中盾构隧道沿曲线掘进施工的室内试验模型,开展了相似模型试验研究小半径曲线隧道盾构施工所引起的地表变形规律。试验充分考虑盾构在小半径曲线隧道的内侧超挖量,对盾构轴线和监测点坐标进行了修正,并通过与工程实测数据对比分析,验证了室内模型试验的合理性。结果表明:小半径曲线隧道盾构掘进施工引起的地表沉降峰值位置会向曲线内侧偏移,而地表隆起峰值随着曲率半径的减小而增大;地表变形曲线可采用双侧高斯曲线进行拟合,拟合得到的沉降峰值、沉降槽左侧和右侧宽度系数可用于修正小半径工况下的Peck经验公式,并能比较准确地预测和评估盾构在小半径曲线段掘进引起的地表变形;曲线外侧的地表隆起峰值和沉降峰值均随着隧道埋深的增加而减小。研究结果对小半径曲线隧道盾构掘进施工引起的地表变形预测有借鉴意义。Compared with the straight tunnel,the surface settlement induced by shield tunneling in a small radius curve tunnel is more complex,and the existing empirical formula can not fit the deformation law well.Based on the shield tunneling project of one subway in Central China,a laboratory model of shield tunneling along a curve in sands is established according to the similarity principle,and then similar model tests are carried out to study the law of surface deformation caused by shield tunneling of a small radius curve tunnel.In the test,the shield axis and the coordinates of monitoring points are modified considering the overbreak of the shield at the inner side of the small radius curved tunnel.The rationality of the indoor model test is verified by comparing it with the measured data of the project.The results show that:The Peak value of the surface settlement will shift to the inside of the curve,and the surface heave increases with the decrease of radius of curvature;The surface deformation can be fitted using bilateral Gaussian curves,the Peak value of settlement and width coefficients of the left and right side of the settlement trough obtained by Gauss fitting curve can be used to modify the Peck empirical formula under the condition of small radius,and they can accurately predict and evaluate the surface deformation caused by shield tunneling in the curve section of small radius;The Peak value of uplift outside the curve and the Peak value of surface settlement caused by tunneling decrease with the increase of tunnel burial depth.The research results have some reference significance for the prediction of surface deformation caused by the construction of small-radius curved tunnels in actual projects,and can be used to guide the design and construction of curved tunnels.

关 键 词：地铁盾构 模型试验 小半径曲线隧道 地表变形 Peck经验公式 

分 类 号：U455[建筑科学—桥梁与隧道工程]