Reaserch The Leakage Of Planted Dam Site Of Yongdingqiao Reservoir

Yongding bridge reservoir which sit in province of Sicuan han yuan built on the drift sand river, the main task satisfy not only new city the source water, rural resettlement and irrigation,but also rational arrange rural life along channels, irrigation and water environment and water township enterprises.yongding bridege have seppage and leakage around dam. It have significant implications for research the leakage of Yongding bridge.The article studies the factors of yongding bridge reservoir on natural geographical conditions, stratigraphic lithology , geological structures and karstic types and influence factors of karst development, hydrogeology conditions, site area and the connectedness of groundwater chemical analysis and experimental research of water. calculating the amount of leakage and suggesting correspond seepage of countermeasures , The main conclusions include flowing facts:(1) The construction site area of yongding bridge carbonate reservoir is mainly distributed in silurian-carboniferous petroleum zhongtong rom provoke ping group. The four thrust faults develop more than the steep rock layer fracture and gently fracture which nearly did fellow ship and into an "X" type, and the left bank of the joints and fissures is right.(2) The development of Site area karst degree is left, right to dissolve KongRong high visibility, karst cave, belong to pipe - soluble clearance channels.(3) Typically, groundwater recharge way has the surface water supply and drainage of atmospheric precipitation recharge, site area mainly migration in karst groundwater piping, significantly better environment on groundwater runoff right. The groundwater drain in a 1700m elevation above is the mountain slope zone for discharge, it focus on quicksand river "U" shaped gugu bottom slope districts to drain.(4) The Construction of yongding bridge in silurian-carboniferous petroleum reservoir dam zhongtong rom provoke ping, lithology strata in middle group mainly for sandy limestone. There can occur with medium permeable dam seepage suggest setting, leakage.(5) Left in the abutment main building provoke ping group dolostone, limestone strata, because water superior run condition, left karst development degree is higher, a pipe net, karst channel reservoir impounding in the karst channel under normal impoundment level will be around the dam seepage main ways. Due to the need to install, seepage karst development bottom trend surface basically identical with weak weathered zone depth limit, curtain to weak weathered zone depth limit. As for karst leakage passages, according to the principle of filling and processed.(6) Right in the abutment main building xujiahe formation, the sand, shale and coal.Overlying artesian well group and the group of shaxi red temple and mudstones from Saul, provoke ping group dolostone, limestone. Rom provoke ping groups in karst development level, low karst seepage less.Attention is the fish in the hole was thick about faults. Suggestions are covered with spray. In addition to bring strong weathering in rock medium permeability, suggest setting seepage control.