Crack Propagation Law of Roof Sandstone and Loading Rate Effect of Fracture Behavior
1.Shandong Provincial Geo-mineral Engineering Exploration Institute (801 Hydrogeology and Engineering Geology Brigade, Shandong Provincial Bureau of Geology and Mineral Resources), Jinan, Shandong 250014, China
2.Shandong Engineering Research Center for Environmental Protection and Remediation on Groundwater, Jinan, Shandong 250014, China
3.School of Civil Engineering and Architecture, Linyi University, Linyi, Shandong 276000, China
4.State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
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