砂卵石地层气垫式泥水盾构的优化

为解决气垫式泥水盾构在砂卵石地层中存在卵石堆积泥水仓和气垫仓底部、造成碎石机频繁损坏和泥浆管路堵塞等问题，通过对底部堆积、堵塞管路、破碎机频繁损坏的原因进行分析，认为造成堆积和堵塞的原因主要是泥浆在气垫仓和泥水仓流速偏低，不能及时带走碴土，从而造成碎石机频繁损坏和仓底底部堵塞。通过对这些问题的研究讨论，提出通过增加底部、刀盘冲刷以及主机段泥浆循环的方案来解决底部堆积、堵塞管路的问题，同时改变碎石机的结构来解决其寿命短的问题。

Optimization of Air-cushion-type Slurry Shield to Cope with Sandy Cobble Strata

When air cushion type slurry shield machines are used in sandy cobble strata, problems, such as cobble accumulation at the bottoms of slurry chambers and air cushion chambers, frequent damage of stone crushers and blocking of slurry circuits, often occur. In this paper, the main causes for the mentioned problems are analyzed. The analysis shows that the main cause for these problems is that the flowing of the slurry in the slurry chambers and air cushion chambers is too slow. Countermeasures, such as adding flushing system for the bottoms of the slurry chambers and air cushion chambers and for the cutter heads, improving the slurry cycling of the main shield bodies and optimizing the structures of the stone crushers, are proposed. 