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隧道建设(中英文) ›› 2024, Vol. 44 ›› Issue (4): 762-770.DOI: 10.3973/j.issn.2096-4498.2024.04.014

• 研究与探索 • 上一篇    下一篇

废弃岩渣壁后注浆体固结时变性及对地层沉降影响研究——以南京和燕路过江通道盾构隧道工程为例

袁锐1, 2, 赵小鹏3, 李鹏飞1, 2, 李震1, 2, 闵凡路1, 2   

  1. (1. 河海大学 岩土力学与堤坝工程教育部重点实验室,江苏 南京 210098;2. 河海大学土木与交通工程学院, 江苏 南京 210098;3. 中交隧道工程局有限公司,北京 100102)

  • 出版日期:2024-04-20 发布日期:2024-05-24
  • 作者简介:袁锐(1999—),男,江苏连云港人,河海大学土木水利专业在读硕士,研究方向为地下空间与隧道。Email: 1561551050@qq.com。

TimeVarying Consolidation of Grout Prepared by Waste Rock Slag for Grouting Behind Lining and Its Influence on Ground Settlement: A Case Study of Heyan Road Yangtze RiverCrossing Shield Tunnel in Nanjing, China

YUAN Rui1, 2, ZHAO Xiaopeng3, LI Pengfei1, 2, LI Zhen1, 2, MIN Fanlu1, 2

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  1. (1. Key Laboratory of Geomechanics and Embankment Engineering, the Ministry of Education, Hohai University, Nanjing 210098, Jiangsu, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, Jiangsu, China; 3. CCCC Tunnel Engineering Co., Ltd., Beijing 100102, China)

  • Online:2024-04-20 Published:2024-05-24

摘要: 为研究废弃岩渣替换商品砂配制的壁后注浆体(岩渣-硬性浆)固结后性质的时变规律及其对地层沉降的影响,采用自制的固结装置进行固结试验,测定浆体弹性模量等性质的时变规律,并采用FLAC3D数值模拟,研究岩渣-硬性浆对地层沉降的影响规律。结果表明: 1)岩渣-硬性浆固结完成后,浆体性质发展迅速,起始弹性模量为1~1.4 MPa 3 d后已达到120~160 MPa,相较于刚固结完成时其内摩擦角增长21.8%,黏聚力增长4~5倍; 2)相比于普通硬性浆,使用岩渣-硬性浆进行壁后注浆能够有效降低地层沉降,最终沉降值降幅为20%左右,但浆体的固结性质差异基本不会改变地层沉降横向影响范围; 3)对比沉降模拟结果与现场实测数据发现,采用固结试验所得的岩渣-硬性浆时变性参数进行地层沉降模拟,可较为准确地反映岩渣-硬性浆填充引起的地层沉降规律,进一步验证了岩渣-硬性浆对地层沉降的控制效果。

关键词: 大直径泥水盾构, 废弃岩渣, 壁后注浆, 固结试验, 地层沉降, 数值模拟

Abstract: To investigate the timevarying pattern of the properties of grout body (rock slaghard slurry) prepared by replacing commercial sand with waste rock slag for grouting behind lining and its influence on ground settlement, a consolidation test is conducted using a selfmade consolidation device. Thus, the timevarying pattern of properties, such as elastic modulus of slurry, is determined. The FLAC3D finite element numerical simulation is performed for the influence of rock slaghard slurry on ground settlement. The results reveal the following: (1) Once the consolidation of rock slaghard slurry is completed, the properties of the slurry undergo rapid development. The initial elastic modulus is in the range of 11.4 MPa and reaches 120160 MPa after 3 d. The internal friction angle and cohesion increase by 21.8% and become 45 times compared to corresponding values when the consolidation is completed. (2) Compared with conventional hard slurry, the rock slaghard slurry used for grouting behind lining effectively reduces ground settlement with a maximum reduction of 20%. The difference in the properties of the slurry after consolidation does not change the lateral influence range of ground settlement. (3) Field measurement data reveal that the simulation results can accurately reflect the ground settlement pattern induced by grouting behind lining using rock slaghard slurry, confirming the effectiveness of rock slaghard slurry in controlling ground settlement.

Key words: largediameter slurry shield, waste rock slag, grouting behind lining, consolidation test, ground settlement, numerical simulation