Risk Control Technology for Subway Tunnels in Water-rich Sand Layers
Taking the tunnel project between Heizhuanghu Station and Wanshengnanjie Xikou Station of the East Extension Project of Beijing Metro Line 7 as an example,the special design of risk projects such as open-cut construction in confined water strata,shield tunnel crossing Beijing-Harbin Expressway and Nandagou Bridge pile,mine section crossing sewage pipe,and contact channel freezing method were carried out before implementation.In the implementation stage,combined with the actual problems on site,the construction unit adopted the construction risk control measures such as groundwater treatment of open-cut foundation exavation in water-rich sand layer,WSS ground grouting reinforcement and anti-collapse of underground excavation vault,additional water stop groove and freezing method for shield entry and exit holes,which effectively solved the engineering problems.The practice shows that the special design for risk and control measures for construction risk play an important role in the construction of water-rich sand layer subway and the safety guarantee of environmental risk,and have achieved good results.
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