# Research Progress on the Mechanisms and Control Methods of Rockbursts under Water-Rock Interactions
## 3 Research Progress on Water's Impact in Strain-Induced Rockburst Experiments
### The Weakening Effect of Water on Hard Rock and the Evolution of Internal Microcracks in the Rock
Water-saturated rocks have a lower potential for energy release during damage, leading to faster damage and greater deformation, thus affecting the overall stability of the rock mass. These observations highlight the complex interplay between water content, confining pressure, and the physical behavior of sandstones. The data show that an increase in moisture not only reduces peak strength and modulus of elasticity but also affects the energy storage capacity of the rock and its response to applied stresses. This understanding is crucial for predicting rock stability and damage mechanisms under various geological conditions. These insights can inform practical approaches to mitigating rockburst hazards in engineering applications, and future research should continue to explore these relationships and make full use of water to weaken rockburst hazards. The experiment tracked acoustic emission energy and found that higher moisture content led to a significant increase in energy release before reaching peak stress. This reduction in acoustic emission intensity indicates a decline in brittle failure as moisture levels rise. Additionally, as moisture increases, the number of internal cracks at the point of failure decreases, suggesting reduced brittleness and a lower capacity for energy storage and strain energy release. This lowers the risk and severity of rock bursts, highlighting the effectiveness of water injection as a preventive measure in underground engineering. Additionally, [PERSON] et al. [49] examined the strength, deformation, and fracture properties of rock samples with varying moisture contents using uniaxial tests. They found that increasing moisture content led to reductions in rock strength and stiffness, while plastic deformation and fracture toughness increased. Additionally, [PERSON] et al. observed that different hard rock types responded differently to the same moisture content, highlighting the need to understand these variations for geological engineering applications. Similarly, [PERSON] et al. [49] investigated the dynamic properties of hard sandstone samples under geological stress with different moisture levels. Their study demonstrated that moisture significantly impacts the dynamic behavior and failure characteristics of hard sandstone. Increased moisture content resulted in decreased strength and stiffness of the sandstone, while plastic deformation and fracture toughness were enhanced. [PERSON] et al. [54] also noted that hard sandstone types displayed distinct dynamic responses under identical geological stress conditions. These findings are highly significant for understanding how moist hard rocks perform and are utilized in geological engineering scenarios. For example, when dealing with mining operations, tunnel excavation, and other similar engineering projects, it becomes crucial to evaluate how groundwater affects the mechanical properties and dynamic responses of hard sandstone. Understanding these impacts is essential for implementing effective measures to ensure safety and stability in engineering practices. Moreover, this research provides foundational data and theoretical insights that are valuable for related fields. It also offers a reference point for future investigations into the behavior and failure patterns of moist hard rocks when subjected to geological stress, contributing to a more comprehensive understanding of these materials.