Experimental Research on Deformation Characteristics and Energy Change of Rock under Different Unloading Rates of Confining Pressures
Experiments of unloading confining pressure of rock were conducted to reveal deformation characteristics of rock mass under different excavation intension in thigh geostress condition. It were concluded from tests that volumetric strain of rock is inverse proportional to unloading rate. The smaller the unloading rate, the bigger the ductility of rock. Energy release are bigger under high unloading rate than that under low unloading rate. That means that tendency of rock burst turn smaller when unloading rates decrease.
Chaohe Chen, Yong Huang and Guangfan Li
X. M. Han and S. D. Li, "Experimental Research on Deformation Characteristics and Energy Change of Rock under Different Unloading Rates of Confining Pressures", Advanced Materials Research, Vols. 243-249, pp. 2885-2888, 2011