小转弯半径盾构隧道施工引起的地层变形特征
许有俊 1,2,3 ,王智广 1,2,3 ,张旭 1,2,3* ,郭飞 4 ,高胜雷 4 ,杨昆 4
(1.内蒙古科技大学土木工程学院,内蒙古 包头 014010; 2.内蒙古科技大学矿山安全与地下工程院士工作站,内蒙古 包头 014010;3.内蒙古自治区高校城市地下工程技术研究中心,内蒙古 包头 014010;4.北京市政建设集团有限责任公司,北京 100048)
依托某小转弯半径盾构隧道工程，通过现场实测分析和数值模拟的方法，研究小转弯半径盾构隧道施工引起的地层变形特征及隧道埋深对地层变形的影响规律。研究结果表明:实测数据和模拟结果基本吻合；土仓压力不变时，隧道埋深越浅，地表变形越小；超挖使曲线内侧地表变形更大，同时造成沉降槽中心线向超挖侧发生偏移；曲线内外两侧地层水平变形特征与直线型隧道显著不同，曲线内侧地层受扰动更严重，应引起足够重视；隧道埋深对曲线内外两侧地层水平变形影响规律不同:隧道埋深越浅，曲线内侧地层水平变形越大，曲线外侧地层水平变形越小。
基金项目： 国家自然科学基金资助项目(52168059)；内蒙古自治区自然科学基金资助项目（2020BS05031）
作者简介：
引用格式： 许有俊,王智广,张旭,等.小转弯半径盾构隧道施工引起的地层变形特征[J].隧道与地下工程灾害防治,2022,4(2):11-18.XU Youjun,WANG Zhiguang,ZHANG Xu,et al.Stratum deformation characteristics caused by construction of shield tunnel with a small turning radius[J].Hazard Control in Tunnelling and Underground Engineering,2022,4(2):11-18.
XU Youjun 1,2,3 ,WANG Zhiguang 1,2,3 ,ZHANG Xu 1,2,3* ,GUO Fei 4 ,GAO Shenglei 4 ,YANG Kun 4
(1.School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;2.Academician Workstation of Mine Safety and Underground Engineering, Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;3.Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region, Baotou 014010, Inner Mongolia,China;4.Beijing Municipal Construction Group Co.,Ltd.,Beijing 100048,China)
Abstract:
Based on a shield tunnel with a small turning radius project,the stratum deformation characteristics caused by the construction of shield tunnel with a small turning radius and the influence law of tunnel buried depth on stratum deformation were studied through analyzing on-site measurement and numerical simulation.The results showed that the on-site measured data were consistent with the simulation results.The shallower the tunnel was buried,the smaller the surface deformation was.The overbreak made the surface deformation inside the curve larger and caused the centerline of the sedimentation tank to offset to the overbreak side in the meantime.The horizontal deformation characteristics of the strata on both sides of the curve were significantly different from those of the linear tunnel.The stratum on the inner side was disturbed more seriously,which should be paid enough attention to.The influence law of tunnel buried depth on the horizontal deformation of stratum on both sides of the curve was different:the shallower the tunnel was buried,the greater the horizontal deformation of the strata inside the curve was and the smaller that outside the curve was.
Keywords
small turning curve;overbreak;stratum deformation;shield tunnel
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