Construction Technology of Metro Tunnel underpassing Airport Apron in Sandy Cobble Stratum
In order to reduce the ground surface settlement caused by the construction of the metro tunnel underpassing airport apron and ensure the normal operation of the airport,the microtremor survey technology,optimization of synchronous grouting parameters,grouting in the tunnel to strengthen the surrounding rock and other measures are adopted relying on the project of Chengdu Rail Transit Line 30 underpassing Shuangliu Airport.The finite element method is used to simulate the shield construction process and analyze the influence of aircraft load on the ground surface settlement.The results show that the ground surface settlement increases under the action of aircraft load,and the surface settlement curve is W-shaped.The surface settlement in the middle line of the tunnel on the left line is the largest,and its value is 5.37 mm,which meets the requirements of surface deformation control at the airport.The microtremor survey technology can effectively detect bad geological bodies and reduce surface lag settlement.
metro tunnelearth pressure balance shield methodunderpassing airportmicrotremor survey technologytunneling parameters
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