Experimental study on energy dissipation of dynamic fracture characteristics of P-CCNBD rock specimens under multiple stress waves
LU Yiqiang1，ZHANG Sheng2，GAO Mingzhong1，YIN Xiangang3，LI Shengwei1，LI Cong1，HE Zhigqiang1
(1. College of Water Resources and Hydropower，Sichuan University，Chengdu，Sichuan 610065，China；2. College of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454001，China；3. Changsha Institute of
Mining Research Co.，Changsha，Hunan 410012，China)
Abstract：In order to investigate the dynamic fracturing characteristics of rock under the loading of multiple stress waves，some marble specimens of 160 mm in diameter being pre-cracked chevron notched Brazilian disc (P-CCNBD) were tested diametrically by using the split Hopkinson pressure bar(SHPB) of 100 mm in diameter. The crack initiation and expansion process of specimens were measured with the crack propagation gauge and strain gauge. The dynamic fracturing and energy dissipation characteristics of specimens were analyzed. The results show that P-CCNBD specimens were fractured under loading of multiple stress waves due to 0.13 MPa impact pressure. The energy dissipation in the process of failure under a single stress wave and multiple stress waves were analyzed. The incident energy，reflected energy and dissipative energy of P-CCNBD specimens were reduced with the increasing of the loading times，but the total dissipation energy of P-CCNBD specimens increased with the increasing of loading times. Both the rate of energy dissipation and the dynamic fracture toughness of P-CCNBD specimens decreased with the increasing of loading times and satisfied the linear relationship approximately. Which helps to understand the dynamic fracture mechanism of rock under loading of multiple stress waves.
鲁义强1，张 盛2，高明忠1，尹贤刚3，李圣伟1，李 聪1，何志强1. 多次应力波作用下P-CCNBD岩样动态断裂的能量耗散特性研究[J]. 岩石力学与工程学报, 2018, 37(5): 1106-1114.
LU Yiqiang1，ZHANG Sheng2，GAO Mingzhong1，YIN Xiangang3，LI Shengwei1，LI Cong1，HE Zhigqiang1. Experimental study on energy dissipation of dynamic fracture characteristics of P-CCNBD rock specimens under multiple stress waves. , 2018, 37(5): 1106-1114.
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2018, Vol. 37 
