Steel stress monitoring analysis for water pressure test of spiral case

Abstract

Taking the water pressure test of Hohhot Pumped Storage Power Station as the research object, the steel stress was analyzed by monitoring data of 3# spiral case. It could be found that the change of steel case stress was closely related to the change of water pressure, multi-correlation coefficients were between 0.993 and 1.000. The largest steel stress (194.65MPa) was less than steel yield strength (610MPa) when the spiral case was faced to the largest inner water pressure. When the inner water pressure was up to holding pressure (3.24MPa), stress of spiral case was 20.73MPa. Under same water pressure, the stresses of up and down socket ring were 1. 1∼1.8 times as much as others in same section. When the largest inner water pressure was transmitted to the spiral case, 3.24MPa internal water pressure was endured by spiral case and 3.36MPa pressure was shared by spiral case and unit concrete. The results show that stress change of 3# spiral case is normal and steel is worked in the elastic range.