Experimental Study on Acoustical Properties and Mechanical Properties of Coal Roof Sandstone
The acoustical experiment and the mechanical experiment of the coal roof standstone specimens in No.3 coal mine in Hebi under high temperature and after high temperature were introduced. The results show that the varying tendency of the longitudinal wave velocity after high temperature is concordant with that of under high temperature. The longitudinal wave velocity declines as temperature rises, but the obviously declining temperature point is different. The peak strength of sandstone under high temperature declines as temperature rises. The mechanical properties of sandstone are static before 400℃, and the shape of stress-strain curves is same. But the discreteness of stress-strain curves increases after 400℃. The failure state of sandstone is shear and expansion failure after the uniaxial compression. The peak strength, elastic modulus and deformation modulus decline as temperature rises after high temperature. The failure state of sandstone after high temperature is mainly that the cracks are tensed. It has many failure planes but do not form main shear failure planes.
rock mechanics sandstone high temperature longitudinal wave velocity mechanical properties failure state
Qin Bendong Luo Yunjun Chen Lunjian
School of Civil Engineering, Henna Polytechnic University, Jiaozuo, 454000, China Department of Infrastructure Construction, Henna Polytechnic University, Jiaozuo, 454000, China Department of Postgraduate, Henna Polytechnic University , Jiaozuo, 454000, China
国际会议
The 2007 International Symposium on Safety Science and Technology(2007采矿科学与安全技术国际学术会议)
河南焦作
英文
495-499
2007-04-17（万方平台首次上网日期，不代表论文的发表时间）