海底盾构隧道穿越破碎带施工稳定性分析
周耀升1,3孙宏远2孟绥宝1冯慧君3詹森1俞然刚4骆超锋1王澜涛1石宝星1
Construction Stability Analysis of Subsea Shield Tunnel Crossing Fracture Zone
ZHOU YaoshengSUN HongyuanMENG SuibaoFENG HuijunZHAN SenYU Ran′gangLUO ChaofengWANG LantaoSHI Baoxing
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作者信息:1.1. 中铁一局集团城市轨道交通工程有限公司， 214104， 无锡;
2.2. 中国重型汽车集团有限公司， 250101， 济南;
3.3. 中铁发展投资有限公司， 266034， 青岛;
4.4. 中国石油大学（华东）储运与建筑工程学院，
5.266580， 青岛
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Affiliation:Urban Rail Transit Engineering Co., Ltd. of China Railway First Group Co., Ltd., 214104, Wuxi, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.10.024
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中图分类号/CLCN:U451+.2
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栏目/Col:研究报告
摘要:
以青岛地铁8号线海域段泥水平衡式盾构机施工为背景，通过FLAC3D有限差分软件模拟计算盾构隧道在穿越F4破碎带时的力学响应，分析了盾构隧道施工时围岩的稳定性，根据现场监测数据验证了仿真模拟的可靠性，对盾构机在破碎带中的掘进参数进行了讨论。结果表明：盾构机穿越时，隧道竖向位移主要集中在拱顶和拱底，在穿越破碎带时位移明显增大；隧道应力最大值主要集中在拱腰附近，且在破碎带中出现拉应力，拉应力极不利于破碎带围岩的稳定性。为保证施工质量及安全，预防围岩失稳事故发生，应采取预加固措施，同时控制与调整掘进参数。
Abstracts:
Taking the sea section slurry balance TBM (tunnel boring machine) construction of Qingdao metro Line 8 as the background, the mechanical response of the shield tunnel when crossing the F4 fracture zone is simulated and calculated by using the finite difference software FLAC3D, and the stability of surrounding rock during shield tunnel construction is analyzed. According to on-site monitoring data, the reliability of the simulation is verified, and the construction parameters of the TBM in the fracture zone are discussed. Results show that when the TBM is crossing, the tunnel vertical displacement is mainly concentrating on the top and bottom of the arch, and the displacement increases significantly when TBM passes through the fracture zone; the maximum tunnel stress is mainly concentrated near the arch waist, and the tensile stress appears in the fracture zone, which is extremely unfavorable to the stability of the surrounding rock in the fracture zone. To ensure the construction quality and safety, and to prevent surrounding rock instability accidents, reinforcement measures should be taken in advance and the tunneling parameters should be controlled and adjusted at the same time.
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