Experimental study on mechanical behavior model of highway tunnel lining cavity diseases
Affected by engineering geological conditions,design and construction technology and operation and maintenance level,most of the early highway tunnels in China have different forms of defects.The problem of highway tunnel lining diseases is becoming increasingly prominent.As the main manifestation of lining diseases,lining cavities seriously threaten the safety and stability of tunnels.Therefore,aiming at the typical tunnel lining cavity disease,this paper takes Wushan tunnel project as an example.In view of the mechanical characteristics of the tunnel lining structure in the process of shrinkage reinforcement and com-mon tunnel lining diseases,the comprehensive test method was adopted.The stress behavior of tunnel lin-ing structure under the influence of cavities at different positions,depths and lengths behind the lining un-der in-situ stress during operation period was studied.The results show that the lining cavity diseases of Wushan tunnel are mainly distributed at the vault.The main reasons for the occurrence of voids are the ag-ing of concrete with the increase of service life and the defects of local construction quality.The influence of the arch crown and empty roof behind the lining on the stress state of the lining structure is greater than that at other positions.The increase of the depth and length of the cavity behind the lining will lead to the increase of lining inner wall stress at the cavity,while the change of other positions is small.
highway tunnellining cavity diseaseindoor model testmechanical behavior
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