1. Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing　 210024,China; 2. College of Civil and Transportation Engineering, Hohai University,Nanjing　 210098,China; 3. School of Civil Engineering,Wuhan University,Wuhan　 430072,China

Different water content states have important influence on the mechanical property and failure mechanism of rock. In order to study the mechanical property and energy mechanism of mudstone with different moisture contents,the conventional triaxial compression tests under different confining pressures on dried,natural and waterlogged samples are conducted using RMT-301 rock mechanics test system. The results show that with the decrease of moisture con- tents,the total energy absorbed by mudstone increases. In compaction and elastic stage,the elastic energy decreases with the moisture content increases. In the elastic-plastic stage,the growth rate of elastic energy decreases,and in the stage of instability and failure,the lower the water content,the higher the elastic storage energy. The limit of storage energy decreases linearly with increasing moisture content under the same confining pressure. In compaction and elas- tic stage,the dissipated energy grows slowly and increases as the moisture content increases. In the elastic-plastic stage,the proportion of dissipated energy to total energy grows rapidly. The growth rate of dissipated energy increases as the moisture content decreases. The results of acoustic emission show that the higher the moisture content and confining pressure,the lower the rate of acoustic emission events and the less the internal orientation events of rock,which indicates that rock internal failures are more intensive with lower moisture contents and smaller confining pressure.

国家重点研发计划重点专项资助项目(2017YFC0404801)；国家自然科学基金资助项目(51539006)；中央级公益性科研院所基本科研业务费专项资金(青年)基金资助项目(Y317003)；

JIANG Jingdong,CHEN Shengshui,XU Jie,et al. Mechanical properties and energy characteristics of mudstone under different containing moisture states[J]. Journal of China Coal Society,2018,43(8):2217-2224.