(一)计算过程(需修改数据为加黄底色,其余不必修改)
(1)计算参数输入(2)基坑当量半径x 0
10000/3.1416=
(2)含水层深度H 0
s 0/(s 0+l)=11/(11+11)=0.50
H 0=(3)抽水影响半径R
(4) 单井涌水量计算q
h=s0+1/2*l=11+0.5*11=T=H0-h=37.4-16.5=l/2T=11/(2*20.9)=
由表4-2-56计算得:A=lg(R n /nrx 0n-1)=lg(R n /ntx 0n-1)=
=20.9/11*(2*lg((4*20.9)/0.4)-2.15)-0.6==1.366*0.7*11*((2*16.5-11)/3.48+2*20.9/(4.14+1.76))
3.481.76
50经试算,采用井管数数n=37.40m
64.85m
4.14
56.42m
由施工设计手册表4-2-55得:16.50m 20.90m 0.26
2.15
总涌水量Q=nq=50*5.88=(4)校核基坑中心水位下降深度
=37.4-√(37.42-(50*141.17)/(1.366*0.7)*(lg64.85-lg56.42))满足设计要求(备用5台)
294.10m3/h =5.88m3/h
选用潜水泵型号为
50WQ20-22-4
=6.54m
=141.17m3/d