Research On Karst Hydrogeology Of Wuxuan Protection Zone Of Datengxia Water Complex

Datengxia project is a comprehensive utilization of flood control, shipping,power engineering。Wuxuan protection zone is located in the reservoir area, protectedarea to reduce flooding in combination with the city flood control,the proposed damdrainage protection design. Need to recharge, runoff and discharge characteristicevaluation of Wuxuan karst water protection，analysis of karst especially superficialkarst development law of pipeline system，a comprehensive analysis of the feasibilityof the protection scheme.This thesis is based on the project, carried out further research on rock protectionzone of karst water, based on studying the geological conditions, and analyzed theinfluence factors of karst development and karst geological phenomenon, using theanalogy analysis method, theory of karst conduit water, underground temperature field,chemical field method to analyze the seepage of groundwater state the research area,and investigate the protective area with similar conditions. The protection project, inorder to verify the reliability of theoretical analysis.The results identify, Wuxuan protection zone is located in the Qianjiang River onthe left bank of the residual peak residual hill plain, belonging to the monoclinic strata,lithology, geological conditions unfavorable to form large-scale karst conduit,exploration hole is revealed a number of karst cave, karst hydrogeological test showedthat, but mostly isolated, only local weak connectedness certain. In the protectionzone of groundwater trough without obvious band, dynamic observation of changes ofgroundwater level and water level change of Qianjiang poor association. Theprotection of groundwater is the pore water, structural fissure water and karst cavewater storage, but the pipe flow for local is not dominant, karst groundwater mainlyslow network flow to the valley river drainage, drainage channel without centralized. Think the hydrogeological conditions of the karst water protection area based,Wuxuan protection zone does not occur large-scale karst conduit flow, low-lyingValley, there occurred fracture, karst seepage flow of underground water level may;Yong high after some low-lying possible immersion; Datengxia reservoir not Wuxuanprotection zone have large-scale karst collapse. Protection zone of dam drainageprotection scheme is feasible.