摘要
针对富水卵漂石地层土压平衡盾构(EPBS)施工出土控制困难、掘进效率低问题,依托成都地铁某盾构隧道区间的现场实验段,对富水卵漂石地层中土压平衡盾构的实测关键施工参数进行了统计分析,并探索了与地层相适应的掘进参数以及提高掘进效率的途径。研究参数包括:出土量、土舱压力、贯入度、掘进速度等,研究结果表明:虽然富水卵漂石地层中的土压平衡盾构掘进易超出土,但通过适当减少土舱压力和增大贯入度能够减少超出土量,盾构法适用于该地层;改善地层可掘削性能和适当降低土舱压力是提高掘进速度有效方法,而增大总推力可能导致掘进速度下降。
Aiming at the problems of earth pressure balanced shield（EPBS） tunneling in saturated cobble and boulder stratum, the difficulty of over excavation controlling and low tunneling efficiency, this paper, based on one field experiment segment of shield tunnel interval in Chengdu metro, studied the measured key construction parameters by statistical analysis, then discussed the tunneling parameters corresponding to the stratum and the way of improving tunneling efficiency. Research parameters included volume of excavated soil, chamber earth pressure, penetration and advance speed. Results show that by properly reducing chamber earth pressure and increasing penetration, the volume of over excavated soil would decrease although over excavation occurs easily in EPBS tunneling in saturated cobble and boulder stratum. It finds that shield driving method is suitable for the stratum; improving the tunneling performance of stratum and reducing the chamber earth pressure properly are effective method to improve advance speed, but the increase of total thrust may reduce it.
出处
《华东交通大学学报》
2015年第6期14-19,共6页
Journal of East China Jiaotong University
关键词
盾构隧道
卵漂石地层
施工参数
适应性
shield tunnel
cobble and boulder stratum
construction parameter
adaptability
