盾构隧道联络通道注浆加固范围及开挖方案分析
汪波1王运周1陈凯2
Analysis of Grouting Reinforcement Scope and Excavation Scheme for Shield Tunnel Link Passage
WANG Bo1WANG Yunzhou1CHEN Kai2
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作者信息:1.中铁隧道集团三处有限公司， 518052， 深圳
2.南昌大学工程建设学院， 330031， 南昌
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Affiliation:1.China Railway Tunnel Group Sanchu Co., Ltd., 518052, Shenzhen, China
2.School of Infrastructure Engineering, Nanchang University, 330031, Nanchang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20230553
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中图分类号/CLCN:U455.48
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栏目/Col:土建工程
摘要:
［目的］盾构隧道联络通道矿山法施工中，土体坍塌和地面沉降过大会危及工程安全，而注浆加固范围及开挖方案直接影响地面沉降和既有隧道安全，因此须对注浆加固范围和开挖方案进行研究。［方法］以南昌轨道交通4号线坛子口站—丁公路南站盾构区间的联络通道为研究对象，采用PLAXIS 3D有限元软件模拟不同注浆加固范围、不同开挖分区对隧道开挖的影响，并将有限元模拟值与实际监测值进行对比分析。［结果及结论］联络通道分区开挖能有效减小隧道、联络通道变形及地面沉降；注浆范围越大，隧道、联络通道变形及地面沉降越小，当注浆加固范围大于3 m时，地面沉降随着加固厚度增大而略有减小，但变化很小。联络通道的注浆加固范围取3 m时经济安全，完全满足设计要求。
Abstracts:
［Objective］ During the construction of shield tunnel link passages using mining method, excessive soil collapse and land subsidence can pose significant safety risks. Since the scope of grouting reinforcement and the excavation scheme directly affect land subsidence and the safety of existing tunnels，it is necessary to analyze both the grouting reinforcement scope and the excavation strategy. ［Method］ Taking the link passage between Tanzikou Station and Dinggong Road South Station on Nanchang Rail Transit Line 4 as research object, the effects of different grouting reinforcement scopes and excavation partitions on tunnel excavation is simulated by PLAXIS 3D finite element software. The finite element simulation results are compared with actual monitoring data for validation. ［Result & Conclusion］ Partitioned excavation of link passage effectively reduces tunnel and passage deformation, as well as land subsidence. A larger grouting scope results in less deformation and subsidence; when the grouting reinforcement scope exceeds 3 meters, further increase in reinforcement thickness leads to only slight land subsidence reduction. A grouting reinforcement scope of 3 meters for link passage is both economically efficient and meets all safety and design requirements.
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