With the intensive and rapid development of urban underground space,there are more and more adjacent construction disturbances to the existing shield tunnels,posing serious challenges to their safety operation and mai...With the intensive and rapid development of urban underground space,there are more and more adjacent construction disturbances to the existing shield tunnels,posing serious challenges to their safety operation and maintenance.Resilience is an integrated representation of the ability of the engineering systems to resist disaster disturbances and recover function,and it can comprehensively reflect the impact of adjacent construction disturbances on the whole disaster chain of shield tunnels.However,the field currently faces challenges related to vague definitions of resilience,diverse evaluation indicators and measures,and an emphasis on evaluation rather than enhancement.Hence,this paper firstly summarized the definition of engineering resilience,especially the resilience of shield tunnels,and proposed the resilience definition of shield tunnels under adjacent construction disturbance,considering the basic connotation of resilience and disturbance characteristics.Secondly,the existing resilience evaluation frameworks for shield tunnels were summarized and analyzed,and the applicability of the existing framework for the shield tunnel under adjacent construction was discussed in light of the disturbance characteristics.Building on the mechanism and deformation characteristics,the resilience evaluation indexes and evaluation methods were reviewed based on the indicators of influencing factors and indicators of effectiveness of the entire disaster chain.Afterwards,the synergistic enhancement technology of shield tunnel resilience was summarized into 4 aspects:optimal structural design,disturbance transmission blocking,structural performance enhancement,and stratum grouting.Finally,research prospects in this field were analyzed systematically.This paper is intended to provide a meaningful reference for the in-depth research and application of structural resilience of shield tunnels subjected to adjacent construction disturbances.展开更多
This study presents the construction of a river channel and a bridge adjacent to existing metro tunnels in Changzhou.The influence of simultaneous construction on these existing tunnels was investigated via 3D numeric...This study presents the construction of a river channel and a bridge adjacent to existing metro tunnels in Changzhou.The influence of simultaneous construction on these existing tunnels was investigated via 3D numerical modelling to predict tunnel deformation before construction.Then,a targeted protection scheme was developed according to the obtained numerical results.The full construction period field monitoring scheme can monitor tunnel responses during construction.Subsequently,the safety of the tunnel structures was evaluated according to the monitoring results,and the evolution of tunnel deformations was analysed.The analytical results can help to clarify the influence characteristics of different construction stages,verify the effect of the proposed protection scheme,and determine the disturbance mechanism of short-distance pile construction.According to the results,the tunnel deformation mainly occurred during pile construction and river channel excavation,and the tunnel vertical displacement and convergence were mainly affected by the construction.The anti-floating scheme of the partition excavation and casting effectively controlled the tunnel heave with an alarm value of approximately 6 mm.The penetration of the short-distance casing resulted in a tunnel deformation.The main construction influence area of the casing pile was within 6D(D is the pile diameter).展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2022YFC3800905)the National Natural Science Foundation of China(Grant Nos.52238010,52090082,and 52108381)Shanghai Science and Technology Committee Program(Grant Nos.22XD1430200,23DZ1202806,and 21DZ1200601).
文摘With the intensive and rapid development of urban underground space,there are more and more adjacent construction disturbances to the existing shield tunnels,posing serious challenges to their safety operation and maintenance.Resilience is an integrated representation of the ability of the engineering systems to resist disaster disturbances and recover function,and it can comprehensively reflect the impact of adjacent construction disturbances on the whole disaster chain of shield tunnels.However,the field currently faces challenges related to vague definitions of resilience,diverse evaluation indicators and measures,and an emphasis on evaluation rather than enhancement.Hence,this paper firstly summarized the definition of engineering resilience,especially the resilience of shield tunnels,and proposed the resilience definition of shield tunnels under adjacent construction disturbance,considering the basic connotation of resilience and disturbance characteristics.Secondly,the existing resilience evaluation frameworks for shield tunnels were summarized and analyzed,and the applicability of the existing framework for the shield tunnel under adjacent construction was discussed in light of the disturbance characteristics.Building on the mechanism and deformation characteristics,the resilience evaluation indexes and evaluation methods were reviewed based on the indicators of influencing factors and indicators of effectiveness of the entire disaster chain.Afterwards,the synergistic enhancement technology of shield tunnel resilience was summarized into 4 aspects:optimal structural design,disturbance transmission blocking,structural performance enhancement,and stratum grouting.Finally,research prospects in this field were analyzed systematically.This paper is intended to provide a meaningful reference for the in-depth research and application of structural resilience of shield tunnels subjected to adjacent construction disturbances.
基金supported by the National Natural Science Foundation of China(Grant No.52078129).
文摘This study presents the construction of a river channel and a bridge adjacent to existing metro tunnels in Changzhou.The influence of simultaneous construction on these existing tunnels was investigated via 3D numerical modelling to predict tunnel deformation before construction.Then,a targeted protection scheme was developed according to the obtained numerical results.The full construction period field monitoring scheme can monitor tunnel responses during construction.Subsequently,the safety of the tunnel structures was evaluated according to the monitoring results,and the evolution of tunnel deformations was analysed.The analytical results can help to clarify the influence characteristics of different construction stages,verify the effect of the proposed protection scheme,and determine the disturbance mechanism of short-distance pile construction.According to the results,the tunnel deformation mainly occurred during pile construction and river channel excavation,and the tunnel vertical displacement and convergence were mainly affected by the construction.The anti-floating scheme of the partition excavation and casting effectively controlled the tunnel heave with an alarm value of approximately 6 mm.The penetration of the short-distance casing resulted in a tunnel deformation.The main construction influence area of the casing pile was within 6D(D is the pile diameter).
