The deformation and failure of a rock is closely related to the strain energy consumption during the load process of rock. To investigate the effect of water on energy evolution and damage characteristics of dolomite samples from a deep mine, the uniaxial compression tests were carried out on dry and water-saturated dolomite samples at different burial depths (900 m–1200 m). The effects of water on the evolution characteristics of elastic and dissipative energy ratios ( Ue/ U and Ud/ U) during rock deformation and failure was analyzed. Based on the variation rate of damage factor ( Df), a new brittleness index is proposed, which can effectively characterize the brittleness characteristics of water-bearing dolomite. The results show that the uniaxial compressive strength and elastic modulus of the water-saturated dolomite are significantly reduced compared to dry sample. The energy and damage evolution process of dolomite can be divided into four stages: initial damage stage, stable damage stage, pre-peak accelerated damage stage and post-damage stage. The variation rate of damage factor of the rock samples in the stable damage stage and the pre-peak accelerated damage stage appeared to increase significantly after water saturation treatment. Compared with water-saturated samples, more pronounced energy hardening characteristics and brittleness characteristics were observed in dry samples. In addition, the possible impact on the stability of deep rock engineering after the deterioration of rock mechanical properties and energy storage properties caused by water was analyzed. Groundwater can somewhat reduce rock burst proneness. However, it also has the potential to lead to greater rock engineering destabilization and failure hazards.

中文翻译：

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深部矿井干水饱和白云石能量及损伤演化实验研究


岩石的变形破坏与岩石在荷载过程中应变能的消耗密切相关。为了研究水对深部矿井白云石样品能量演化和损伤特征的影响，对不同埋深（900 m~1 200 m）的干燥和水饱和白云石样品进行了单轴压缩试验。分析了水对岩石变形破坏过程中弹性能比和耗散能比（Ue/U和Ud/U）演化特征的影响。基于损伤因子（Df）的变化率，提出了一种新的脆性指标，可以有效表征含水白云石的脆性特征。结果表明，水饱和白云石的单轴抗压强度和弹性模量与干燥样品相比显着降低。白云石能量与损伤演化过程可分为四个阶段：初始损伤阶段、稳定损伤阶段、峰前加速损伤阶段和损伤后阶段。含水饱和处理后，岩石样品在稳定损伤阶段和峰前加速损伤阶段的损伤因子变化率均出现明显增大。与水饱和样品相比，在干燥样品中观察到更明显的能量硬化特征和脆性特征。此外，还分析了水引起岩石力学性能和储能性能恶化后对深部岩石工程稳定性可能产生的影响。地下水可以在一定程度上降低岩爆倾向。然而，它也有可能导致更大的岩石工程不稳定和破坏危险。