Group Of Double Complex Space Tunnel Cross Section Deformation Control Of Construction

With the development of the modern tunnel construction technology,new principle of the method has been widely used in the tunnel,especially in the large span nearly meet tunnel cross section is generally by the steps of the construction method,small steps method due to the constraints of disturbance,working space is large,the stability of surrounding rock is small,is one of the large span mountains one of the most commonly used method in tunnel construction.But in the complex geological conditions,two recent tunnel cross section,supporting design scheme tends to be conservative,cause of waste at the same time increase the risk of the construction quality and safety,how to reduce the rapid railway under complicated geological conditions of nearly connect tunnel cross section construction difficulty,Reduce the construction cost,to solve the quality issue such as difference of difficult to control and integrity of surrounding rock.This topic based on a newly built railway before Yang to ZhuangHe DT2 blocks Caomeigoul#tunnel on the tunnel across the Pandaoling tunnel as well as Caomeigou2#tunnel under wear Pandaoling highway tunnel,close to high-speed railway tunnel cross section study of key technology of construction,in combination with cross tunnel design and construction experience at home and abroad,based on relevant theories,design a reasonable structure,the construction is simple,costs less tunnel construction scheme.by applying Hoek Brown's strength criterion,Mohr-Coulomb yield criterion,embankment settlement control standard calculation theory,new support design principle of the method,innovation proposed the full use of bearing capacity of surrounding rock,almost meet tunnel cross section of the construction technology of information,add anchor through near it,Steel support advanced double row of small pipe and through hole body double fill of tent to improve formation method enhances the cross the stability of the tunnel structure,The stress of the supporting structure in a reasonable range,structural internal force balance in order to achieve.Subject adopts theoryresearch,indoortest,the numericalsimulation,comprehensive site monitoring method,from the study of three phases,in engineering geological data in combination with the exploration of working conditions on site,determined by preliminary scheme comparison monitoring plan,and then the calculation of supporting structure in tension and compression,the deformation of tunnel surrounding rock is calculated.to verify this theory in the plan implementation,summarizes construction technology of forming method.through the engineering practice,the construction technology can effectively solve the temporary foundation construction cost is high,construction difficult problems,etc.Has the very good application prospect,will provide a beneficial reference for future similar projects.