【作者】 阮维；

【导师】 邓英尔；

【作者基本信息】 成都理工大学 ， 环境地质， 2010， 硕士

【摘要】 拟建永定桥水库位于四川省汉源县境内的流沙河上,其任务主要为满足汉源新县城的城市用水、农村移民安置区的生活和灌溉用水,并合理安排渠道沿线农村的生活、灌溉、乡镇企业用水及环境用水。拟建永定桥水库坝址区存在坝基渗漏和绕坝渗漏问题。因此,对拟建永定桥水库坝址区渗漏开展研究有重要的意义。本文研究了拟建永定桥水库坝址区的自然地理条件、地层岩性、地质构造、岩溶类型及影响岩溶发育的因素、水文地质条件,并进行坝址区地下水连通性实验研究及水化学分析,对渗漏量进行了计算,并提出相应的防渗处理措施与建议。论文主要结论为:(1)拟建永定桥水库坝址区碳酸盐岩广布,主要是志留系中统罗惹坪组(S2l)。发育四条断层,均为逆断层;节理裂隙较发育,多为陡倾的切层裂隙和与岩层近于平行的平缓裂隙相交而成“X”型节理。(2)坝址区左岸岩溶发育程度明显较右岸高,主要为溶孔溶隙,可见溶洞,岩溶通道属于管道-溶隙型。(3)坝址区地下水的补给方式有地表水体补给和大气降雨的补给。坝址区地下水主要运移于岩溶管道系统之中,左岸地下水径流环境明显优于右岸。地下水排泄一是在高程1700m以上的高山斜坡地带进行排泄,二是集中于流沙河“U”形谷谷底斜坡地段进行排泄。(4)拟建永定桥水库坝体置于志留系中统罗惹坪组中段地层上,岩性主要为砂质灰岩。存在中等透水带,可发生坝基渗漏,建议设置防渗帷幕。(5)左岸坝肩主要建筑在罗惹坪组白云岩、灰岩地层上,由于左岸地下水径流条件优越,岩溶发育程度较高,岩溶通道呈管网状,水库蓄水在正常蓄水位之下的岩溶通道将成为绕坝渗漏的主要途径。需设置防渗帷幕,帷幕深度需达到弱风化带下限深度。对于溶洞等集中渗漏通道按照堵、填、排的原则进行处理。(6)右岸坝肩主要建筑在须家河组地层上,岩性主要为砂、页岩和煤线;上覆自流井组和沙溪庙组的红色砂、泥岩层,下伏罗惹坪组白云岩、灰岩。罗惹坪组岩溶发育程度较低。但需引起注意的是鱼洞处的断层破碎带,建议对其进行喷浆覆盖处理,并对强风化带内岩层设置防渗帷幕。更多还原

【Abstract】 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.更多还原