不同岩体条件下双护盾TBM施工性能分析

Analysis of Double-shield TBM Construction Performance Under Different Rock Mass Conditions

针对复杂地质条件下城市地铁隧道双护盾TBM的掘进性能评价,依托青岛地铁6号线创石区间左、右线TBM施工段,对全线施工数据进行收集与分析,研究不同围岩类别下双护盾TBM掘进参数与施工性能参数的变化规律。不同围岩类别下TBM利用率分析表明,双护盾TBM对岩体质量较差的围岩段具有良好适应性。分析了不同围岩类别下各掘进参数与工程破岩比能SE间关系,贯入度与SE的相关性最好,更适合作为评价TBM掘进过程中能量消耗的指标,且在不同围岩类别下,贯入度与工程破岩比能SE呈较好的负幂指数关系,在Ⅱ,Ⅲ,Ⅳ,Ⅴ类围岩类别下,当贯入度分别>2,5,8,10mm/r时,其对应的工程破岩比能SE在较低水平。

For the evaluation of the boring performance of double-shield TBM in urban subway tunnels under complex geological conditions,this paper relies on the TBM construction section of the left and right lines of Chuangzhi Valley Station\|Shishan Road Station interval of Qingdao Subway Line 6,and collects and analyzes the construction data of the whole line to study the changes in the boring parameters and construction performance parameters of double-shield TBM under different surrounding rock categories.The analysis of the TBM utilization rate under different rock mass conditions shows that double-shield TBM has good adaptability to the complex rock masses.The relationship between various excavation parameters and engineering rock breaking specific energy SE is analyzed under different types of surrounding rock.The correlation between penetration and specific energy is the best,making it more suitable as an indicator for evaluating energy consumption during TBM excavation.Moreover,under different types of surrounding rock,penetration has a good negative power exponential relationship with engineering rock breaking specific energy SE.In types II,III,IV and V of surrounding rock,when the penetration exceeds 2mm/r,5mm/r,8mm/r,and 10mm/r,respectively,the corresponding engineering rock breaking specific energy SE is at a lower level.