Method of detecting and evaluating compressive strength of in-service shaft wall concrete

Abstract

In order to detect and comprehensively evaluate the wall compressive strength of the in-service shaft lining, the laboratory test and the on-site ultrasonic-rebound comprehensive method are used to test the compressive strength of the concrete wall in the main inclined shaft of a coal mine. The results show that the result value in laboratory test of the wall concrete block is 35.3MPa, and the average value by the rebound method is 40.57MPa, while the estimated value detected by the ultrasonic-rebound method is 34.3MPa; The results by laboratory test, rebound method and ultrasonic-rebound comprehensive method are comparatively analyzed, and through comprehensive analysis, the test results by the ultrasonic-rebound comprehensive method have higher confidence, with the estimated value likely closer to the actual strength and meeting the testing requirements; The test results could provide data support for the stability and safety assessment of the shaft wall.