全断面卵石地层泥水盾构环流系统针对性优化设计及应用

Targeted Optimization Design and Application of Slurry Shield Circulation System in Full-section Pebble Formation

为解决泥水盾构在全断面卵石地层掘进时环流系统的堵塞滞排问题,结合洛阳地铁2号线博物馆站—九都西路站盾构区间泥水盾构全断面卵石地层中施工穿越洛河工程,提出一种并联式采石箱设计方案。先后进行普通并联式采石箱、串联采石箱、新型格栅滚筒式采石箱及直通管道自落式旁通采石方案等应用研究,并开展工业性试验,逐步总结方案并优化完善。结果表明:(1)直通管道自落式旁通采石方案,可以较好地解决泥水盾构在卵石含量高、卵石粒径大的地层中掘进时的管路滞排问题,大大提高掘进效率;(2)新型格栅滚筒式采石箱若能解决滚筒卡顿的问题,也能较好地处理类似工况;(3)对于新制造盾构,建议采用优化的新型格栅滚筒式采石箱方案,理论上该方案应更加高效。

The blockage and drainage problem often occur to slurry shield circulation system when tunneling in fullsection pebble formation.As a result,a design solution of parallel quarrying box is studied and proposed for slurry shield crossing Luohe River in full-section pebble formation of Bowuguan Station-Jiuduxilu Station on Luoyang Metro Line 2.The application research of common parallel quarrying box,series quarrying box,new type of grille roller quarrying box and straight pipeline self-falling bypass quarrying are carried out successively,and industrial tests are also carried out to improve the quarrying mode.The results show that:(1)The straight pipeline self-falling bypass quarrying scheme can solve the pipeline blockage and drainage problem when the slurry shield tunneling in the stratum with high pebble content and large pebble diameter,thus greatly improve the tunneling efficiency.(2)The new type of grille roller quarrying box can solve the problem of drum lag.(3)For the newly manufactured shield,it is suggested to adopt the optimized new grille roller quarrying box scheme,which would be more efficient theoretically.