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《Journal of Geomechanics》 2007-03
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MECHANIC RESPONSE OF A SHALLOW-EMBEDDED AND DOUBLE-ARCH TUNNEL UNDER PARTIAL PRESSURES DURING CONSTRUCTION

XIANG An-tian,ZHU He-hua,DING Wen-qi,JIA Ming-hui(Geotechnic Engineering Institute,Tongji University,Shanghai 200092,China)  
Taking an expressway in Jiangxi province as the engineering background,the behavior of a shallow-embedded and double-arch tunnel with partial-pressure during construction is simulated.Several aspects,such as stress concentration and transfer,plastic zone distribution,vault displacement and change of vertical stress,(σ_y) of the mid-leading wall with construction are studied systemtically.The study indicates that:1)asymmetrical excavation is the key cause of partial pressure in the mid-leading wall and the construction of the first and second lining can not ameliorate the conditions greatly;2)under conditions of shallow embedment,vault displacement increases with embedment depth and displacement mainly happens during excavation of tunnel before lining construction;3) after excavation of the up-bench tunnel,pulling stress concentrates around the top arch and lining should be constructed promptly or beforehand;4) as a result of partial pressure,when plastic zones around the side-wall and midleading wall heel,which are near the mountain ridge,are better developed;and 5)when construction finished,compressive stresses at tunnel side-walls disappear and are transferred to the inverse arch and second lining,making them concentrated by shear stress and normal stress and improving the stability of the tunnel.
【CateGory Index】: U451
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