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隧道建设(中英文) ›› 2022, Vol. 42 ›› Issue (S2): 114-123.DOI: 10.3973/j.issn.2096-4498.2022.S2.014

• 研究与探索 • 上一篇    下一篇

砂土地层小曲率半径盾构隧道施工引起的地层变形规律——以南通地铁1号线为例

韩旭1, 张冰利2, 洪小星1, 朱先发1, 王铭杰1, 张冬梅2   

  1. (1. 南通城市轨道交通有限公司, 江苏 南通〓226007 2. 同济大学地下建筑与工程系, 上海〓200092) 
  • 出版日期:2022-12-30 发布日期:2023-03-24
  • 作者简介:韩旭(1978—),男,江苏海安人,1999年毕业于东南大学,交通土建工程专业,本科,高级工程师,主要从事轨道交通建设管理工作。Email: thinker_78@163.com。

Ground Deformation Caused by Shield Tunneling with Small Curvature Radius in Sandy Stratum: a Case Study of Nantong Metro Line 1

HAN Xu1, ZHANG Bingli2, HONG Xiaoxing1, ZHU Xianfa1, WANG Mingjie1, ZHANG Dongmei2   

  1. (1. Nantong Urban Rail Transit Co., Ltd., Nantong 226007, Jiangsu, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China)

  • Online:2022-12-30 Published:2023-03-24

摘要: 以南通地铁1号线青年路联络线小曲率半径盾构项目为工程背景,针对小曲率半径隧道施工超挖和转弯引起的地层变形问题,利用数值模拟和现场监测相结合的方法,揭示小曲率半径隧道施工对地层变形的影响规律。数值和监测结果表明: 不同于直线盾构隧道推进对地层的影响规律,曲线段盾构隧道掘进过程中曲线外侧地表沉降量小于曲线内侧;并且由于盾构隧道转弯过程中刀盘在内侧超挖,在内侧产生了附加卸荷作用,使隧道上方土体沉降和下方土体的隆起显著增加。隧道转弯施工引起隧道上方土体的水平位移基本对称,位移方向为指向隧道中心方向;对于隧道中心处周围的深层土体而言,隧道转弯施工引起的内外两侧土体水平位移呈非对称状态,方向指向隧道外侧方向。

关键词: 小曲率半径, 盾构隧道, 砂土地层, 地层扰动, 现场监测, 数值模拟

Abstract:

In this study, a case study is conducted on shield tunnel with small curvature radius on Qingnian road connecting line of Nantong metro line 1, and the tunnelinginduced disturbance on stratum and tunnel structure is monitored and analyzed. A threedimensional numerical model of shield tunneling is established to simulate the tunneling process. The results show the following: (1) The surface settlement outside the curve is less than that inside the curve. (2) The overexcavation of the cutterhead at the inner side produces an additional unloading effect. As the consequence, the vertical displacement of the soil above and below the tunnel increase dramatically. (3) The horizontal displacement of the soil at the upper sides of the tunnel is basically symmetrical, and moves towards the tunnel center. (4) The horizontal displacement of the soil at the tunnel center is asymmetric, and moves towards outside of the tunnel at both sides of the tunnel.

Key words: small curvature radius, shield tunnel, sandy stratum; stratum disturbance, insitu monitoring, numerical simulation