Effect of Seepage Velocity on Formation of Shaft Frozen Wall in Loose Aquifer

Table 3

Comparison of maximum seepage velocity and duration at velocity measurement point.

Initial seepage velocity (m/d)	Maximum seepage velocity (m/d)		Maximum seepage velocity increase (m/d)	Peak duration (d)	Downstream flow velocity duration (d)
1	7.18	7.18	6.18	1	21
2	16.41	7.21	12.41	2	25
3	20.29	6.76	17.29	3	26
4	24.68	6.17	20.68	7	32
5	28.98	5.80	23.98	9	41
6	32.57	5.43	26.57	13	52
7	36.65	5.24	29.65	18	66
8	40.65	5.08	32.65	22	87
9	43.74	4.86	34.74	29	122
10	44.54	4.45	34.54	51	—