盾构穿越软土地层预加固数值模拟与变形控制
摘要:依托佛山地铁3号线创驹区间盾构隧道工程，采用数值模拟得到不同加固方式下的地表沉降和隧道变形，研究了盾构穿越全断面软土地层时的变形规律，提出一套盾构安全穿越加固建议，并结合现场实测，验证了模拟结果的正确性。研究表明：盾构在全断面软土地层中推进时，地表沉降、隧道拱顶沉降和水平收敛值均不断增大，且主要发生在盾构通过时及盾尾管片脱出后，同时该段也是预加固的主要作用范围；先行隧道对地表沉降影响大于后行隧道；盾构穿越未加固土层时地表沉降、隧道拱顶沉降、水平收敛最大值分别为27.7 mm、13.78 mm、10.57 mm，采用超前预注浆加固时各变形分别为未加固的57.0%、69.1%、61.0%，采用三轴搅拌桩预加固时各变形分别为未加固的32.1%、50.2%、43.0%，预加固可有效控制变形，且三轴搅拌桩变形控制优于超前预注浆加固。当盾构区间地面环境复杂，不具备地面加固条件时，建议采用超前预注浆加固控制地表沉降量及隧道变形。
Abstract:Relying on the shield tunnel project in the Chuang-Ju section of Foshan Metro Line 3, the surface settlement and tunnel deformation under different reinforcement methods were obtained by numerical simulation, and the deformation law of the shield when crossing the full-section soft soil layer was studied. A set of suggestions for shield tunnel safety crossing reinforcement is proposed, and the simulation results are verified by combining with the field measurement. The research shows that when the shield is advancing in the full-section soft soil stratum, the surface settlement, tunnel vault settlement and horizontal convergence value all increase continuously, which mainly occur when the shield passes through and after the shield tail segment is protruded, and it is also the main scope of action of pre-reinforcement; the impact of the leading tunnel on the surface settlement is greater than that of the trailing tunnel; when the shield passes through the unreinforced soil layer, the maximum values of surface settlement, tunnel vault settlement, and horizontal convergence are 27.7 mm, 14.28 mm, and 10.57 mm, respectively. The deformations of the pre-grouting reinforcement are 57.0%, 66.6%, and 61.0% of the unreinforced ones, respectively. When the triaxial stirring piles are used for pre-reinforcement, the deformations are 32.1%, 48.5%, and 43.0% of the unreinforced ones. The pre-reinforcement can effectively control deformation, and the deformation control of the triaxial stirring pile is better than that of the advance pre-grouting reinforcement. When the ground environment in the shield tunnel is complex and the ground reinforcement conditions are not available, it is recommended to use advance pre-grouting reinforcement to control the surface settlement and tunnel deformation.
中文标题：
盾构穿越软土地层预加固数值模拟与变形控制
Numerical Simulation and Deformation Control of Shield Tunneling Through Soft Soil Layer Pre-reinforcement
作者：
吴永哲1,,靳贻杰2,,张志宇1,王岩梓2,杨平2,,
Wu Yongzhe1,,Jin Yijie2,,Zhang Zhiyu1,Wang Yanzi2,Yang Ping2,,
作者简介:吴永哲，男，1978年生，朝鲜族，吉林和龙人，大学本科，高级工程师，从事公路、铁路、轨道交通技术研究。E-mail：1627255299@qq.com通讯作者:杨 平，男，1964年生，汉族，江西樟树人，硕士，教授，从事环境岩土与地下工程的教学与研究工作。E-mail：yangping@njfu.edu.cn
通讯地址：
1.中交隧道工程局有限公司，江苏南京 210007 2.南京林业大学土木工程学院，江苏南京 210037
1.CCCCTunnelEngineeringCompanyLimited,Nanjing210007,Jiangsu,China 2.SchoolofCivilEngineering,NanjingForestryUniversity,Nanjing210037,Jiangsu,China
中图分类号:U455.43
doi:10.3969/j.issn.1007-2993.2024.01.004
出版物：岩土工程技术
收稿日期:2022-12-28
修回日期:2023-04-12
录用日期:2023-07-14
网络出版日期:2024-02-05
刊出日期:2024-02-05
关键词:全断面软土,盾构掘进,预加固方案,数值模拟,变形控制
Key words:full-section soft soil,shield tunneling,pre-reinforcement scheme,numerical simulation,deformation control
文档包含图片数量：图片(9)张
文档包含表格数量：表格(4)个
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基金项目：
基金项目:国家自然科学基金（51709088）；中交隧道局科研项目（FSGDJT-3202-2-JS-08）
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