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.
关键词
地铁运营隧道/地铁车站/花岗岩风化槽/抽采地下水/沉降/原因及防治
Key words
subway operating tunnels/subway stations/granite weathering trough/groundwater extraction/settlement/causes and prevention
维普
万方数据