针对盾构施工过程中，常因地面加固、机械维护等因素造成长时间停机等待的情况进行了分析，并以北京八号线二期地铁盾构保压施工为例，研究了停机位置的选择要求，总结了停机前以及停机期间的技术要点，解决了因停机引起的泥浆流失、地表沉降等问题。%According to long downtime waiting caused by ground reinforcement,mechanical maintenance and other factors in shield tunnel con-struction process and analyzed the situation,taking the holding pressure technology of metro shield construction of Beijing No. 8 line phaseⅡas an example,researched the selection requirements of downtime position,summarized the technology key points of downtime and downtime period, solved the mud loss,ground subsidence and other problems caused by downtime.
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