水对岩石具有软化、溶蚀和水楔作用，为研究不同含水率作用下岩石的能量机制，利用MTS815岩石力学试验系统开展了5种含水率状态下砂岩的常规三轴压缩试验。结果表明：随含水率的增大，岩石吸收总能量的增速和总量减少；弹性能增速在储能阶段随含水率的增加而减小，但弹性能的释放速率则大致相当，岩石的储能极限随含水率的增大而减小；岩石变形破坏所耗散量随含水率的增加而较小，但不同含水率作用下岩石的峰前和峰后能量耗散速率则大致相当；岩石的耗散能比例可以反应内部的损伤状态，耗散能比例随时间变化呈现出先增大后减小，然后再稳定增长，最后急剧变大的规律；随着含水率的增大，声发射能率的集中程度和强度逐渐减小，声发射累计能量随含水率的增大而减小，表明随着含水率的增加，岩石的储能能力和应变能释放能力降低，岩石的脆性破坏特征减弱，塑性增强。

Water has softening, dissolving and water wedging effects on rocks. To study the energy mechanism of rock with different moisture contents, the conventional triaxial compression tests on sandstone with five moisture contents are conducted using MTS815 rock mechanics test system. The results show that, with the increase of moisture contents, the increase rate of total energy absorbed by rock and its amount decrease. The increase rate of elastic energy decreases with the increase of moisture content, but their release rates differ slightly. The energy storage limits decrease with the increase of moisture content. The dissipated energy causing rock failure decreases as the moisture content increases, but the increase rates of ante- and post-peak dissipated energies are roughly identical. The proportion of dissipated energy to total energy can reflect the status of internal damage of rock, the variation of the proportion with time can be divided into four stages, i.e., gradual increase, decline, stable increase again, sharp growth. With the increase of moisture content, the concentration degree and intensity of acoustic emission energy gradually decrease. The total acoustic emission energy decreases as the moisture content increases. It is shown that the energy storage capacity and strain energy release ability of rock reduce with the increase of moisture content, meanwhile its plasticity is enhanced and brittleness is weakened.