Research on Control Technology of Shield Tunneling Through High-speed Railway in Water-rich Sand Layer
Based on the background of the construction of the EPB shield under the section from Dongfeng Road station to Xuefu Road Station of Xi'an rail transit metro line 10 through the high-speed railway,the tunneling parameters and control measures of EPB shield under the water-rich sand layer are studied based on the data of shield test section.According to the tunnel depth and geological conditions of the existing high-speed railway section,the specific tunneling construction parameters of the shield tunneling construction are determined through the 200m shield test section.Among them,the tunneling speed is controlled to be 35～40mm/min,the unearthed amount is 54～60m3,the secondary grouting pressure is 0.4～0.5MPa,the underpass grouting amount is 7.8～8.5m3/ring and the soil bin pressure is 1.0～1.2bar.Synchronous grouting and secondary grouting should be followed up in time during the underpass process.
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