Research on the Causes and Prevention of Subsidence of Operating Subway in the Granite Weathering Trough Section
Through tracking the settlement monitoring results of the Kemulang station and its adjacent shield tunnels of Guangzhou Metro Line 6 for 10 years,statistical analysis of settlement patterns and laws,combined with Geological survey,it is believed that the causes of settlement are:the settlement section is located in the granite weathering(deep)trough section with unfavorable geological conditions,covered with water rich sand layer deposited by the Holocene ancient river channel.Overextraction of groundwater as the population increases.The imbalance of rainwater groundwater circulation caused by the implementation of projects such as ground hardening and organized drainage,which greatly reduces the amount of natural rainwater that seeps into the ground.The coupling effect of the three leads to a continuous decrease in the groundwater level in the area,and synchronous positive correlation settlement of the tunnel,station,and ground.Decision making in response to the above issues:controlling overexploitation of groundwater;change and expand the capacity of public tap water.After implementation,the groundwater level significantly increased,the rate of ground and tunnel settlement significantly decreased,and some local points rose,resulting in a stable tunnel.
subway operating tunnelssubway stationsgranite weathering troughgroundwater extractionsettlementcauses and prevention
万方数据
维普
