Study on Deformation Control and Monitoring Data of Deep Excavation Engineering Adjacent to the Subway Tunnel
Taking the foundation pit project of a subway station as an example,the deformation control measures of deep foundation pit adjacent to operation line are studied.Occlusal pile is used in foundation pit,the construction sequence of sub-pit excavation is formulated,MJS is used to strengthen the soil outside the pit,the numerical results show that the displacement and deformation of the existing tunnel meet the de-sign requirements,the effectiveness of the deformation control measures of the supporting structure is verified.Construction monitoring data shows that during the construction of foundation pit,the existing tunnel produces horizontal movement relate to the side of foundation pit and vertical settlement,maximum horizontal displacement is 12.1mm,maximum settlement is 6.9mm;The cross section of the tunnel is oval with"vertical convergence and lateral expansion",the maximum horizontal expansion is 3.4mm.The displacement and deformation of the existing line meet the control standard of the operation line,ensures the operation safety during the construction,it can provide some guidelines for the design and construction of similar projects.
Existing tunnelDeep excavationNumerical simulationDeformation control
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