| Geological conditions is relatively complex in karst region. When tunnel across the karst region, the existence of cave will not only affect the stability of surrounding rock, but also affect the stress of tunnel lining. Many scholars at home and abroad made detailed and comprehensive research on geological disasters caused by karst cave, yet few studies on the stress of tunnel lining after karst cave treatment have been analyzed. On the basis of Baishan and Huilong mountain tunnel engineering, and combined the Guangdong province transportation technology project "Study on structure safety later assessment and operation monitoring technology of more cavity tunnel "(SG2G-2011-001), disease mechanism and treatment technique of karst tunnel is studied in this dissertation, content includes followings:(1) By investigations of the construction record and water leakage during operation for Baishan and Huilong moutain, the number and location of tunnel karst cave and lining crack are contrastively analyzed, the corresponding relationship of fracture and cave is revealed.(2) With elastic foundation beam theory, the internal force and displacement calculation formulas of equivalent beam has been derived, and the internal force and displacement of lining has been analyzed, the internal force and displacement law of tunnel lining after treatment has been promulgated.(3) On the basis of different karst cave scale and compression modulus, the internal force and displacement of lining has been numerically analyzed. The force and deformation characteristics in case of different karst scale and compression modulus has been obtained, and it will provide effective reference for the treatment.(4) According to lining crack analysis, combined with the tunnel test data and the engineering practice of Baishan tunnels, the pretreatment in construction stage and aftertreatment in operation stage has been put forward, which will provide technical support for karst disease control. |
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