TESTING STUDY ON LAND DEFORMATION AND RESPONSE OF SHAFT LINING DURING DISCHARGING AND RECHARGING TO THE STRATA

摘要

In the testing station developed by us, the law of land deformation and additional strain of the shaft lining was studied during discharging and recharging to aquifer. The evolutional law of additonal strain of the shaft lining was achieved in condition of different speed of discharge and recharge and cycle variation of the water level. The following several points were achieved, both land deformation and additional strain were nonlinearly increased by the speed of discharge, and the faster the speed of discharge is, the more obvious the nonlinearity is; Land subsidence can be partially recovered by recharging to the aquifer, and the ratio of recovery is increased by the speed of recharge; The additional strain of shaft lining can be released by recharging to aquifer, and the value of released strain basically has nothing to do with the speed, the average value of test is 67.4 percent; After four circulations of discharge and recharge, the additional strain of shaft lining achieved a balanced state. A new way that the rapture of shaft lining was prevented by recharge was originated.