熒光示蹤劑選擇
熒光(guang)示蹤(zong)劑的(de)(de)(de)選擇需遵守無毒、自(zi)然本底值低(di)、不(bu)受圍(wei)巖干擾、化學性能穩定、不(bu)改變地下水(shui)的(de)(de)(de)運(yun)移(yi)方向、易檢測、靈敏(min)度(du)高且(qie)成本相對低(di)的(de)(de)(de)原則。根據隧道區地下水(shui)化學資料分(fen)析,地下水(shui)示蹤(zong)試驗的(de)(de)(de)示蹤(zong)劑有多(duo)種選擇,考(kao)慮到經濟、環境等原因(yin),推薦(jian)采用水(shui)溶性熒光(guang)示蹤(zong)劑。
熒光示蹤劑投放點和接收點設置
一般情況下示蹤(zong)劑(ji)投放地點應(ying)該(gai)(gai)出(chu)在調(diao)查水(shui)系(xi)的(de)上游,接收點位于(yu)水(shui)系(xi)的(de)下游,以(yi)便示蹤(zong)劑(ji)順水(shui)流(liu)滲流(liu)。同時應(ying)該(gai)(gai)滿足以(yi)下要求:
投(tou)放(fang)點(dian)(dian)(dian)和(he)接收(shou)點(dian)(dian)(dian)應位于(yu)同一(yi)地質構(gou)造帶上,通(tong)過初步(bu)地質勘(kan)查和(he)調查,應保證投(tou)放(fang)點(dian)(dian)(dian)和(he)接收(shou)點(dian)(dian)(dian)位于(yu)同一(yi)水(shui)系,二者(zhe)之(zhi)間(jian)的(de)地表面不應該(gai)有水(shui)系通(tong)過,投(tou)放(fang)點(dian)(dian)(dian)應具(ju)(ju)備示蹤劑投(tou)放(fang)條(tiao)件(jian),接收(shou)點(dian)(dian)(dian)應該(gai)具(ju)(ju)備監測和(he)取樣(yang)條(tiao)件(jian),并且在水(shui)系調查時應重(zhong)點(dian)(dian)(dian)關注(zhu)接收(shou)點(dian)(dian)(dian)]
熒光示蹤劑監測方法
監(jian)(jian)(jian)測(ce)(ce)與測(ce)(ce)試方法。采用紫(zi)外示(shi)(shi)蹤檢(jian)測(ce)(ce)燈(deng)現場(chang)監(jian)(jian)(jian)測(ce)(ce)地(di)下水的(de)(de)(de)熒光變化(hua),監(jian)(jian)(jian)測(ce)(ce)時(shi)間(jian)(jian)安排(pai)。由于被(bei)調查的(de)(de)(de)地(di)下暗(an)河空間(jian)(jian)分布極為(wei)復(fu)雜,從(cong)投(tou)放點(dian)到zui遠監(jian)(jian)(jian)測(ce)(ce)點(dian)的(de)(de)(de)距離約(yue)4.5km,可能存在監(jian)(jian)(jian)測(ce)(ce)不(bu)到示(shi)(shi)蹤劑(ji)(ji)的(de)(de)(de)可能,為(wei)了保證(zheng)監(jian)(jian)(jian)測(ce)(ce)效果并減小工作(zuo)量,監(jian)(jian)(jian)測(ce)(ce)時(shi)間(jian)(jian)安排(pai)為(wei):在各(ge)監(jian)(jian)(jian)測(ce)(ce)點(dian)未(wei)監(jian)(jian)(jian)測(ce)(ce)到示(shi)(shi)蹤劑(ji)(ji)之前,各(ge)監(jian)(jian)(jian)測(ce)(ce)點(dian)的(de)(de)(de)時(shi)間(jian)(jian)間(jian)(jian)隔為(wei)2h;監(jian)(jian)(jian)測(ce)(ce)劑(ji)(ji)初(chu)現后,則監(jian)(jian)(jian)測(ce)(ce)時(shi)間(jian)(jian)間(jian)(jian)隔改為(wei)1h,直到示(shi)(shi)蹤劑(ji)(ji)濃度回落到自然本底(di)值后24h結束監(jian)(jian)(jian)測(ce)(ce)。(end)
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