Research On Water Pressure Damage Property Of Waterproof Layer In Composite Lining Of Highway Tunnels And Matrix Defects Character

In company with the enlargeing of inland foundation construct, highway tunnel is increaseing without halt.However,leakage in highway tunnel is a common disease, is also a maximal drawback to influence directly project security, quality and schedule. There are no idiographic construction crafts to farther consider, especially on waterproof layer surface not solving leakage,resulting in water leaking notwithstanding prodigious input in practical project.Therefore,it is necessary to analyse the reasons of waterproof layer leaking,and put forward new construction crafts.The major content of this article is aiming at character of leakage in Jin-Li-Wen Highway Tunnel, analysing the reason of waterproof layer leakage in highway tunnel,adopting Galerkin method and Rize method in the theory of plate with large deflection,basing on studying the damage property of waterproof layer under water pressure and matrix defects character of concrete,choosing appropriate waterproof board,designing design rational waterproof proposal,designing new construction technology of waterproof layer, and puting forward synthetical waterproof measure in highway tunnel.The target of this article is finding a new method to solve water leakage of highway tunnel in construction technology of waterproof layer.The result of this article is shown as follows:1 .It is central reason of highway tunnel waterproof board leaking that the breakage of waterproof layer during tunnel construction period, tunnel construction joint at top of middle blocking walls misconducting and the bad construction quality.2. The result of Rize method is on the small side than Galerkin method,but whole variant trend is identical.3.It is ensuring waterproof board not breakage that the arrow subtense ratio of concrete matrix disfigurement at less than two-thirds, tensile strength of waterproof board should greater than 18.96MPa? fracture elongation of waterproof board should greater than 144 pecent, and back fill grouting in time during tunnel construction period.4.It is good method to solve highway tunnel leakage that protecting waterproof board not breakage, tunnel construction joint at top of middle blocking walls disposing with felicitousness and the good construction quality.