The Damage Study Of Early-age High Strength Concrete Shaft Lining Subjected To Blasting Load In Northwest Freezing Shaft

According to the store characteristic of coal resource in our northwest country and the problemencountered in excavating shaft with freezing method, and on the basis of theoretical analysis, thedamage of early-age high strength concrete shaft lining in low temperature environment subjected toblasting load when excavation in frozen shaft was researched and analysis in detail through situ test,numerical simulation and model test. High strength concrete was made and measured for thestrength growth law and ultrasonic variation law in standard curing and low temperature conditionaccording to situ environment with compression test and ultrasonic wave measure method. Thedamage and ultrasonic variation of concrete?and the correlation relationship between them wereanalyzed through quickly and repeatedly load and unload test. The dynamic mechanical property ofearly-age high strength concrete subject to one and twice impact load was gained from its SHPB testin standard curing and low temperature condition. Vibration propagation law?deformation and stresslaw?and damage variation law of high strength concrete shaft lining subjected to blasting load merecalculated out from situ test data?numerical model data and model test data. The safety criterion wasalso analyzed based on above research results.