地铁越江泥水盾构到达接收渗漏风险控制技术

Risk Control Technology of Leakage Accident for the Subway Arriving

研究目的:本文以某实际工程盾构到达接收为背景,针对在高承压水、强透水地层条件下盾构到达站点时发生的盾构接收渗漏存在的风险,从注浆加固、降水、管片监控、环境监控、管片修复等方面,提出一种盾构到达接收渗漏风险控制技术,为类似地下工程施工风险控制提供参考。研究结论:通过实际工程中盾构到达接收渗漏风险的控制,得出以下结论:(1)严格管理,做到精细化施工可以大大降低接收渗漏风险;(2)盾构接收风险控制可通过洞内注浆加固、端头降水加固、盾构管片结构监控、周边环境监控、盾构管片修复来实现;(3)现场对渗漏水进行统计,如有渗漏,须立即采用聚氨酯进行封堵且应控制好压力;(4)盾构管片发生破损、错台、变形等损害后,可利用内层修补方法和外层修补方法对管片进行修复;(5)施工过程中应加强对盾构管片结构、周边地表及房屋等的监测,监测频率及监测点布设应适当加密;(6)地铁盾构进洞施工方案的选择应通过专家讨论,通过比选最终选择制定相对安全的施工方案;(7)本研究成果可应用于类似工程的盾构到达接收渗漏风险控制。

Research purposes： a treatment technology for the 1 In the background of leakage accident in a practical engineering, this paper put forward eakage accident in the subway arriving construction in the light of the technology like grouting reinforcement, end precipitation strengthening, segment structure monitoring, surrounding environment monitoring, segment repair and so on. Research conclusions：By processing end reinforcement accident in a practical engineering, this paper arrived at the conclusion：（ 1 ）Strict management and fine construction can greatly reduce the risk of end reinforcement. （2）The risk control can be realized by the technology like grouting reinforcement, end precipitation strengthening, segment structure monitoring, surrounding environment monitoring and segment repair. （3）We should make statistics for the seepage water,and if there is seepage water, use polyurethane to block the leakage water with the standard that the pressure is not more than 0.4 MPa. （4） Use the inner and outer repairing method to repair the segment. （ 5 ） On the progress of construction, the monitoring of shield segment structure, surrounding surface and housing should be strengthened, monitoring frequency and monitoring sites should be properly encrypted. （6）The subway shield construction plan should be discussed and selected through experts, and the relative safe construction scheme is finally chosen through the comparison. （7）The research can be applied for the risk control of the similar engineering.