Highway Tunnel Lining Cracking Mechanics Model And Mechanism Of Bearer

Tunnel lining cracking the most common diseases,cracking of tunnel lining structure overall security,stability and the effect of the tunnel operators have an important impact.Mechanical Properties of summarizing the research status at home and abroad as well as the relevant highway tunnel lining cracks in the survey analysis,carried out important issues for cracking lining structure research,according to the process of the formation and expansion of tunnel lining crack,cracking mechanism from starting Lining Cracking and relying on China Merchants Chongqing Communications Research Institute's commitment to "disease tunnel test and simulation system development" project,carried out Capacity test cracking lining structure,mechanism of crack analysis bearing lining structure.Work and achievements of this paper carried out are as follows:(1)Based on the literature data of inspection by their predecessors,the collection of Guangdong,Yunnan,Chongqing,Fujian,Sichuan,Hainan,Zhejiang,Tibet,tunnel inspection reports of tunnel lining crack statistical analysis,classification summary liner cracks appear Causes and classification;(2)For cracks lining structure numerical simulation analysis,the use of load-structure method using ANSYS finite element software to establish fracture mechanics model to calculate the crack tip stress intensity factor analysis of crack occurred in different parts in ? Grade Rock contrast conditions mechanical properties and stability of lining structure;(3)By analyzing the stress intensity factor near the crack tip,the stability of the crack in different depth and width is determined,and the influence of the crack depth on the stability coefficient of the lining structure is larger than that of the width;(4)Expand the residue bearing performance test cracking lining structure,mechanism of crack analysis bearing lining;(5)Based on the above research,to further improve the fracture evaluation method to assess the stability and safety of cracking lining structure to provide theoretical support for the Treatment of cracks.