Research On Influence And Technology Of Hall Of Corridor Type Cave On The Structure Of Tunnel

In the process of construction of tunnel in karst region,there are often many caves with different size at different places,which will cause serious damage to safety,will affect the schedule and greatly increase the construction costs.Therefore,how to dispose the problems met in karst cave economically and safely will become the key factors to the construction of tunnel,and it will have great engineering application value.This paper is based on the fourth section of naqiu tunnel of younge high-speed for the features of bias and the large corridor water-eroded cave hall type section.we analyzed the influences of karst cave to the stability of tunnel by collecting data,theoretical research,numerical simulation and the comparison of the field monitoring data.The main results of the research are as follows:(1)This paper summarizes the development mechanism,the formation rule,the influencing factors,classification and treatment technology of Corridor style Karst cave.(2)After the treatment research of Corridor style Karst cave in naqiu tunnel and a comprehensive comparative analysis respectively from the feasibility of the scheme,the rationality of the economy,the ease of construction,we finally determine the scheme of using flaky backfilled embankment,which is more suitable for the management of the corridor style Karst cave.(3)Through the analysis of typical section surrounding rock displacement and stress by using ABAQUS software to simulate the corridor style karst cave,we get the results that compared with the bridge span,the scheme of using flaky backfilled embankment is more conducive to the stability of tunnel surrounding rock.(4)Through the analysis of the monitoring data field measurement,it shows that after the processing of the scheme of using flaky backfilled embankment,the deformation(including vault subsidence and peripheral convergence)of the corridor style Karst cave is small and within the scope of the requirements compared with Bridges across schemes.Each section of the vault subsidence and time effect of peripheral convergence curves are presented the "factory" type regularity.