富水硬岩地层泥水平衡盾构掘进参数的优化分析
卢泽霖1王旭春1曹云飞1江玉生2
Optimization Analysis of Slurry Balance Shield Tunneling Parameters in Water-rich Hard Rock Stratum
LU ZelinWANG XuchunCAO YunfeiJIANG Yusheng
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作者信息:1.1. 青岛理工大学土木工程学院， 266033， 青岛;
2.2. 中国矿业大学（北京）力学与建筑工程学院, 100083, 北京
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Affiliation:School of Civil Engineering, Qingdao University of Technology, 266033, Qingdao, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.10.030
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中图分类号/CLCN:U455-43
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栏目/Col:施工技术
摘要:
泥水平衡盾构穿越富水硬岩地层时，合理的掘进参数是盾构安全高效掘进的基础。依托青岛地铁8号线某区间泥水平衡盾构段项目，分析了盾构穿越富水硬岩地层的总推力及贯入度等参数。对刀具与岩体作用荷载值和刀具荷载设计值进行了计算，提出了盾构掘进参数的优化方案，并分析了优化后的掘进效率。结果表明：总推力可以控制刀盘贯入度，宜优先通过控制总推力增加盾构掘进速度；刀具与岩体作用荷载为4 27787 kN，远小于9 52822 kN的设计荷载值，故可适当增加刀具与岩体作用荷载至设计荷载值的75%；盾构总推力提升至18 000 kN后，刀盘贯入度增加，每环开挖耗时较优化前减少了387%，施工效率增加了一倍。
Abstracts:
When slurry balance shield is excavating through water-rich hard rock stratum, reasonable tunneling parameters provide the basis to ensure the safe and efficient excavation of shield tunnel.Relying on a slurry balance shield construction project in an interval of Qingdao Metro Line 8, the parameters of shield tunnel excavating through water-rich hard rock stratum including total thrust and penetration depth are analyzed. Calculation is carried out on cutter tool and rock action load, and cutter tool load design value.Optimization scheme of shield tunneling parameters is proposed, and the optimized excavation efficiency is analyzed. Results show that: the total thrust can control the penetration of cutter tool, priority should be given to the total thrust control to increase shield tunneling speed. The cutter tool and rock action load is 4 277.87 kN, much smaller than the design load value of 9 528.22 kN, so the cutter and rock action load can be adequately increased to 75% of the design load value. After the shield thrust is increased to 18 000 kN, the cutter tool penetration is increased. The excavation time of each ring is 38.7% less than that before optimization, and the construction efficiency is doubled than before.
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