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《Chinese Journal of Underground Space and Engineering》 2017-03
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Study on Site Dynamic Monitoring of Soft Rock Tunnel with Large Span

Shao Zhushan;Xiong Yangyang;College of Civil Engineering,Xi'an University of Architecture and Technology;  
Based on the engineering background of soft rock tunnel with large span in Inner Mongolia,a series of monitoring tests and numerical analysis were studied.Rules of measurement data changing with time and excavation distance were analyzed,including vault crown settlement,the stress of steel support,the stress between surrounding rock and initial support,the stress between initial support and secondary lining.In additional,the stability of surrounding rock was analyzed using the existing theories and methods.The results indicate:derivative analyses of the vault crown settlement fitting function illustrates the surroungding rock in good stability condition;The stress between surrounding rock and initial support reaches a constant value when the distance between this section and the highest step of tunnel face exceeds 65 m;The external stress of steel support is greater than the internal stress,the maximum value is less than the yield strength of steel support,and the steel support is always in the state of security or basic safety;The stress between initial lining and secondary lining reaches the maximum after the secondary lining pouring about two days,then it decreases and stabilizes,and the stable value is less than 0.1 MPa;In additional,the rule of surrounding rock displacement calculated with the numerical analysis is almost the same with that from the monitoring test,which proves the rationality of the model.The experiences and conclusions can be adopted in the design,construction and research of similar tunnels.
【CateGory Index】: U456
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