Research on Key Technology for Shield Launching under Deep Water-rich Sand Layer Geological Condition
An earth pressure balance shield machine is used to construct the right line between Baidang South Station and Yangdong Road Station on Suzhou Metro Line 7.The launching end of Baidang South Station is only 17 meters away from residential buildings,and the geology of the launching end is mainly composed of silt with water-rich sand layer thickness of 9-11 meters.Through the comparison and selection of the schemes,it is determined that the triaxial mixing pile reinforcement+external wrapping triaxial mixing pile with waterproof curtain and the reinforcement method of rotary jet grouting pile to deal with the joint combined with the dewatering method are adopted,and the posture control,surface settlement and building settlement during the shield launching period are strictly controlled,so as to realize the smooth launching of the shield and the safe undercrossing of residential buildings.
shield launchingdeep water-rich sand layerrotary jet grouting piledewatering construction
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