Abstract: The blockage and drainage problem often occur to slurry shield circulation system when tunneling in fullsection 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.

Key words: slurry shield, shield tunneling, pebble formation, circulation system