RESEARCH ON FAILURE MECHANISM OF CRACKED LINING REINFORCED WITH STACKED INNER LINING
LIU Xuezeng1，LIU Wenyi2，SANG Yunlong3，KONG Fanlin4
(1. Civil Engineering Information Technology Research Center of Ministry of Education，Tongji University，Shanghai 200092，China；2. School of Civil Engineering，Tongji University，Shanghai 200092，China；3. Shanghai Tongyan Civil Engineering Technology Co.，Ltd.，Shanghai 200092，China；4. Chongqing Construction Science Research Institute，Chongqing 400020，China)
Abstract：Based on laboratory model test with 1∶10 geometric similarity factor，stacked inner lining has been taken to reinforce the structure with axial cracks on the top lining. With test data，we conclude the failure mechanism of reinforced lining under loose pressure，by analyzing its lateral deformation，development of main cracks，short-term stiffness of lining apex and final failure mode. In addition，we also quantitively study the influence of crack depth on the ultimate bearing capacity. It is important to note that the cracked tunnel works under loose load and the rock resistance coefficient is 10 MPa/m. The results show as follows：(1) the process of failure can be divided into three stages，namely，specimen crack stage，“arch crack-penetrated arch crack”，penetrated arch crack-specimen fail. (2) The main cracks in on the vault and haunch，the overall failure mode is brittle failure. (3) There exist linear relationship between existed crack depth and crack moment，short term stiffness，ultimate load.
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2015, Vol. 34 
