小曲率半径转弯隧道盾构施工扰动实测分析

发布时间：2018-04-11 22:21

本文选题：隧道工程 + 盾构掘进　；参考：《岩石力学与工程学报》2017年04期

【摘要】：受规划及已建结构物的制约,小曲率半径转弯盾构隧道的应用越来越广,小曲率半径转弯隧道盾构施工对紧邻土体扰动有待研究。以广州220 kV犀牛站电缆隧道工程为背景,通过动态监测小曲率半径段转弯盾构施工引起土体分层沉降、水平位移、孔隙水压力的变化,分析小曲率半径转弯隧道盾构掘进对紧邻土体的扰动规律。分析结果表明小曲率半径隧道转弯段盾构掘进过程中,隧道侧边土体沉降及水平位移与直线段隧道有显著不同,且会增加对周边环境的扰动,应引起足够重视。隧道转弯段外侧土体的沉降规律与直线段隧道不同,在盾体挤压作用下竖向离隧道较近的土层不是沉降最大的,甚至可能产生隆起。转弯段土体的深层水平位移由两部分位移的叠加而成:一是盾体通过过程中,由于盾体挤压作用而产生的向外远离隧道的位移;二是由于盾体转弯造成不对称变形,转弯外侧挤压向隧道外位移,转弯内侧卸载向隧道内位移。
[Abstract]:Restricted by planning and existing structures, the application of small curvature radius turning shield tunnel is more and more extensive, and the disturbance of adjacent soil caused by small curvature radius turning tunnel shield construction needs to be studied.Taking the cable tunnel project of Guangzhou 220 kV rhinoceros station as the background, the variation of soil layer settlement, horizontal displacement and pore water pressure caused by small curvature radius turning shield tunneling construction is dynamically monitored.The disturbance law of shield tunneling with small curvature radius to adjacent soil is analyzed.The analysis results show that the lateral soil settlement and horizontal displacement of the tunnel are significantly different from those of the straight tunnel during the shield tunneling with small curvature radius, and the disturbance to the surrounding environment will be increased, which should be paid enough attention to.The settlement law of the soil outside the turning section of the tunnel is different from that of the straight section tunnel. The vertical soil layer near the tunnel is not the largest settlement under the action of shield compaction and may even produce uplift.The deep horizontal displacement of the soil in the turning section consists of two parts of displacement: one is the displacement far away from the tunnel caused by the extrusion of the shield during the passage of the shield, the other is the asymmetric deformation caused by the turning of the shield.Press the outside of the turn to the outside of the tunnel and unload the inside of the turn to the inside of the tunnel.
【作者单位】：华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;广州市市政工程设计研究总院;广州地铁集团有限公司;
【基金】：广东省科技计划项目(粤科函规财字[2015]1303号x2tjB2160460) 华南理工大学亚热带建筑科学国家重点实验室研究课题(2015ZC16) 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室资助课题(Z015013)~~
【分类号】：U455.43

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