【项目设计】尾矿库下游坝截渗池设施设计

某尾(wei)矿库库区及附属(shu)设(she)施占地(di)面积13.102km2，汇水(shui)面积15.41km2，库容(rong)10.04亿(yi)m3，属(shu)于一等(deng)尾(wei)矿库。

尾矿库下(xia)游(you)坝(ba)截(jie)渗(shen)(shen)(shen)池(chi)(chi)(chi)(chi)(chi)(chi)设(she)施主(zhu)要(yao)包括拦(lan)砂(sha)(sha)池(chi)(chi)(chi)(chi)(chi)(chi)和(he)渗(shen)(shen)(shen)水(shui)(shui)收集池(chi)(chi)(chi)(chi)(chi)(chi)，其中拦(lan)砂(sha)(sha)池(chi)(chi)(chi)(chi)(chi)(chi)主(zhu)要(yao)用于拦(lan)截(jie)和(he)沉淀尾矿库渗(shen)(shen)(shen)水(shui)(shui)或坝(ba)面(mian)雨水(shui)(shui)携带的尾砂(sha)(sha)，现场共设(she)置有2座拦(lan)砂(sha)(sha)池(chi)(chi)(chi)(chi)(chi)(chi)，池(chi)(chi)(chi)(chi)(chi)(chi)底(di)(di)标(biao)高(gao)为(wei)62m，边(bian)坡顶(ding)标(biao)高(gao)为(wei)65m，尺寸(cun)均约为(wei)175m×82m×2m；渗(shen)(shen)(shen)水(shui)(shui)收集池(chi)(chi)(chi)(chi)(chi)(chi)则位于拦(lan)砂(sha)(sha)池(chi)(chi)(chi)(chi)(chi)(chi)下(xia)游(you)用于收集拦(lan)砂(sha)(sha)池(chi)(chi)(chi)(chi)(chi)(chi)排水(shui)(shui)，池(chi)(chi)(chi)(chi)(chi)(chi)底(di)(di)标(biao)高(gao)为(wei)61.5m，边(bian)坡顶(ding)标(biao)高(gao)为(wei)65m，尺寸(cun)大小为(wei)175m×170m×2m。现场拦(lan)砂(sha)(sha)池(chi)(chi)(chi)(chi)(chi)(chi)与渗(shen)(shen)(shen)水(shui)(shui)收集池(chi)(chi)(chi)(chi)(chi)(chi)之间通过2条过水(shui)(shui)明渠相连，各池(chi)(chi)(chi)(chi)(chi)(chi)体均采用干(gan)砌石护坡。

尾(wei)矿(kuang)库下游一般设(she)(she)置有拦砂池、截渗(shen)(shen)(shen)池和回水泵房等设(she)(she)施(shi)，尾(wei)矿(kuang)库所(suo)产(chan)生的渗(shen)(shen)(shen)滤液通(tong)过(guo)收(shou)集后作(zuo)为(wei)生产(chan)用水或回灌(guan)至尾(wei)矿(kuang)库。根据项目(mu)设(she)(she)计(ji)(ji)、施(shi)工及现场勘探，尾(wei)矿(kuang)库设(she)(she)计(ji)(ji)按照(zhao)《尾(wei)矿(kuang)设(she)(she)施(shi)设(she)(she)计(ji)(ji)规(gui)范》进(jin)行相关设(she)(she)计(ji)(ji)，在截渗(shen)(shen)(shen)池（渗(shen)(shen)(shen)滤液收(shou)集池）坝体部分设(she)(she)置帷幕注浆或混凝(ning)土截渗(shen)(shen)(shen)坝等垂直防渗(shen)(shen)(shen)措施(shi)，未设(she)(she)置水平(ping)防渗(shen)(shen)(shen)措施(shi)，对(dui)地下水环境(jing)产(chan)生一定环境(jing)风(feng)险。

根据尾矿库渗(shen)(shen)水(shui)回收泵站及管(guan)理站地勘资料，地质岩(yan)(yan)层结构自(zi)上而下(xia)依次(ci)划分为(wei)(wei)黏土(tu)质圆(yuan)砾(li)、全(quan)风化凝(ning)(ning)灰质千枚(mei)岩(yan)(yan)、强风化凝(ning)(ning)灰质千枚(mei)岩(yan)(yan)和(he)中风化凝(ning)(ning)灰质千枚(mei)岩(yan)(yan)。黏土(tu)质圆(yuan)砾(li)层底(di)标(biao)高为(wei)(wei)59.78~60.50m，截(jie)渗(shen)(shen)池底(di)标(biao)高为(wei)(wei)61.5~62.5m，位(wei)于(yu)黏土(tu)质圆(yuan)砾(li)层，渗(shen)(shen)透系数大于(yu)1×10-5cm/s。