大慶(qing)降(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)工程(cheng)是指在(zai)地(di)(di)下(xia)(xia)(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)較高的地(di)(di)區(qu)開挖深基(ji)(ji)(ji)(ji)(ji)坑(keng)，由于(yu)含(han)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)層被切斷(duan)，在(zai)壓(ya)差(cha)作用(yong)(yong)(yong)下(xia)(xia)(xia)，地(di)(di)下(xia)(xia)(xia)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)必然會不斷(duan)地(di)(di)滲(shen)(shen)流入基(ji)(ji)(ji)(ji)(ji)坑(keng)，如(ru)不進行基(ji)(ji)(ji)(ji)(ji)坑(keng)降(jiang)(jiang)排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)工作，將(jiang)會造成(cheng)基(ji)(ji)(ji)(ji)(ji)坑(keng)浸水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)，使現場施(shi)工條件變差(cha)，地(di)(di)基(ji)(ji)(ji)(ji)(ji)承載力下(xia)(xia)(xia)降(jiang)(jiang)，在(zai)動水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)壓(ya)力作用(yong)(yong)(yong)下(xia)(xia)(xia)還可(ke)能引起流砂、管涌和(he)邊坡失穩等(deng)現象(xiang)，因此，為確保基(ji)(ji)(ji)(ji)(ji)坑(keng)施(shi)工安(an)全，必須采(cai)取有(you)效的降(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)和(he)排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)措施(shi)，亦稱降(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)工程(cheng)。常見(jian)做法輕(qing)型(xing)井(jing)(jing)點（多(duo)級(ji)輕(qing)型(xing)井(jing)(jing)點）：適(shi)用(yong)(yong)(yong)于(yu)巖土(tu)滲(shen)(shen)透系(xi)數為10**(-2)～10**（-5）cm/s；可(ke)能降(jiang)(jiang)低的水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)深度：輕(qing)型(xing)井(jing)(jing)點為3～6m、多(duo)級(ji)輕(qing)型(xing)井(jing)(jing)點為6～12m。噴射井(jing)(jing)點：適(shi)用(yong)(yong)(yong)于(yu)巖土(tu)滲(shen)(shen)透系(xi)數為10**(-3)～10**（-6）cm/s；可(ke)能降(jiang)(jiang)低的水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)位(wei)深度8～20m。電滲(shen)(shen)井(jing)(jing)點：適(shi)用(yong)(yong)(yong)于(yu)巖土(tu)滲(shen)(shen)透系(xi)數為<10**(-6)cm>10m。井(jing)(jing)點降(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)降(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)費(fei)用(yong)(yong)(yong)：1、鑿(zao)井(jing)(jing)費(fei)用(yong)(yong)(yong)2、設備安(an)裝(zhuang)3、降(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)費(fei)用(yong)(yong)(yong)（抽(chou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)）降(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)分兩個階段進行：1、成(cheng)井(jing)(jing)：多(duo)遠一(yi)個，深多(duo)少。鉆(zhan)孔、下(xia)(xia)(xia)管、下(xia)(xia)(xia)料2、安(an)裝(zhuang)排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)設備，以排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)效果(guo)一(yi)井(jing)(jing)一(yi)泵(beng)一(yi)出(chu)口管，周邊設排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)池根據涌水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)量確定泵(beng)的直徑(jing)。真空泵(beng)降(jiang)(jiang)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)所有(you)井(jing)(jing)密閉，用(yong)(yong)(yong)總管連接，用(yong)(yong)(yong)泵(beng)抽(chou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)，排至市政管網。明溝排水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)費(fei)用(yong)(yong)(yong)：挖溝+引流+水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)泵(beng)抽(chou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)