Analysis of the Impact of Excavation of Working Shafts in Power Tunnels on Existing Subway Structures
To analyze the impact of construction of power tunnel working shafts on nearby subways,takes a certain power tunnel work-ing shaft as an example and analyzes the deformation effects of various excavation conditions of the working shaft on the subway station sec-tion and subway station through numerical simulation.At the same time,in order to improve the accuracy of the evaluation,in addition to calculating the impact of construction on deformation,a special analysis was also conducted on the safety of the subway structure,the im-pact of excavation and dewatering of the foundation pit,and the impact of tunnel anti floating.The main conclusions are as follows:① Dur-ing the construction of the working well,the maximum horizontal displacement in the x direction,the maximum horizontal displacement in the y direction,and the maximum vertical displacement in the z direction of the subway station section are 0.311 mm and 0.269 mm,respec-tively;The maximum horizontal displacement in the x direction of the station is 1.599 mm,the maximum horizontal displacement in the y di-rection is 0.837 mm,and the maximum vertical displacement in the z direction is 2.422 mm,all of which meet the requirements of relevant regulations,and the construction risk is controllable;② The construction process of the work well controls the cracks in the underground tunnel structure and the main structure of the subway station within the allowable values specified in the specifications;③ To control the im-pact of groundwater drawdown on adjacent structures,it is necessary to control the groundwater level drawdown within 2 meters during the construction of the working well.
power tunnelnumerical simulationexcavation of work wellsprecipitation impact
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