当盾构机顶部是淤泥、砂层和软黏土等软弱地层时,带压进入土舱工作存在很大的风险,一般不予考虑。但如果采取可靠的技术措施有效地进行风险控制,则也能取得成功,并可产生较高的经济效益。本文在此介绍一例盾构机在覆土厚度较薄且顶部是砂层的地段带压进舱工作的成功经验。 When the top of the shield machine is a silt, sand and soft clay and other weak formations, there is a great risk that the belt pressure into the soil tank work, are generally not considered. However, if reliable technical measures are taken to effectively carry out risk control, they will also be able to achieve success and generate higher economic benefits. This article introduces a case of shield machine in the casing thickness is thin and sand is the top of the reservoir with pressure into the cabin work experience.