The Technology of Block Stone Detection and Treatment for Shield Tunnel in Complex Site
Research purposes:The presence of boulder clusters in the overburden layer has a significant impact on shield tunneling construction for subway sections.Conventional drilling or geophysical exploration methods are not very effective in investigating boulder clusters,and selecting appropriate exploration methods and clearance techniques is a major challenge for similar projects.Based on the section from Wushan Square Station-Jiangcheng Road Station of Hangzhou Metro Line 7,this paper systematically introduced the comprehensive exploration technology of block stones in the overburden under complex site conditions,and analyzed the related technologies of block stone removal for subway shield tunnels based on advanced grouting reinforcement and blasting pretreatment.Research conclusions:(1)Under the condition of a large number of existing surface buildings,it is necessary to combine drilling with geophysical prospecting for the detection of block stone.(2)Microtremor detection has a distinct advantage in detecting boulders in overburden layers.(3)The blasting pretreatment shall be adopted in the site with conditions,and the advanced grouting reinforcement pretreatment shall be adopted in case of encountering block stones in the absence of blasting site conditions.After the shield tunneling,the soil around the segment shall be reinforced by long pipe grouting.If necessary,the warehouse should de cleaned under pressure.(4)The research results can provide reference for the investigation,design and construction of shield tunnel engineering under similar complex site conditions.
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