摘要：

Based on the engineering practice of Beijing Railway Station - Beijing West Railway Station Underground Connecting Line and through comparison among different configurations of shield cutter head and cutters used under the sand-pebble condition, the adaptability of the cutter head and cutters of this project to strata before and after improvement has been studied in details, and moreover the following conclusions have been made according to analysis: (1) it is necessary to adopt disc cutters in configuration of the cutter head and cutters for compact sand-pebble stratum, and furthermore the disc cutter size as well as the cutter height difference between layer 1 and layer 2 should be increased whenever possible according to the pebble size and compactness to promote cutting penetration and tunneling efficiency; (2) effective cutting of the sand-pebble stratum can be achieved through logical configuration of cutters in different lengths such as disc cutters, splitters, and cutting bits, etc. (3) through optimization, the original connection mode of cutter, i.e. bolt connection is substituted by pin connection to prevent cutters from falling during tunneling and so on. The key problems that need attention in configuration of the cutter head and cutters under the sand-pebble condition have been solved, which can guarantee smooth implementation of the project and provide reference for other similar projects.