盾构长距离穿越上软下硬富水石灰岩地层施工技术

长距离穿越上软下硬富水石灰岩地层一直是盾构施工的难题,掘进过程中刀具磨损严重、突遇溶洞、螺旋机喷涌、频繁带压开仓换刀,严重影响掘进速度并存在极大的安全隐患。徐州市地铁2号线百果园站-拖龙山站盾构区间有420m连续长距离穿越上软下硬富水石灰岩地层,对施工进度、组织效率、工程安全均提出了较高要求。基于此,本文对盾构机刀盘刀具进行设计优化、螺旋机出土口防喷涌改造、优化掘进参数有效地控制刀具磨损,最后顺利完成本区间的施工任务并取得良好效果。

Construction Technology of Shield Tunneling Crossing Upper Soft and Lower Hard Water-rich Limestone Stratum at a Long Distance

Long distance cossing through upper soft and lower hard water-rich limestone stratum has always been a dificult problem for shield tunneling.In the process of tunneling,the tool wear is serious,karst cave is suddenly encountered,the screw machine spewed,the warehouse opened and the tool changed frequently with pressure,the turneling speed is seriously afected and there are greal safety risks.The shield section between Baiguoyuan Staion and Tuolongshan Stution of Xuzhou Metro Line 2 has 420 meters of continuous long distance passing through the upper soft and lower hard water-rich limestone stratum,which puts forward higher requirements for construction progress,organization fficiencey and engineering safety.Based on this,the cutter head of shield machine is designed and optimized,the outlet of screw machine is transformned to prevent gushing,and the driving parameters are optimized to electively control the culter wear.Finally,the construction tasks in this area is sucessfully completed and good results are achieved.