Study On Damage Mechanics Of Soaking Rock And Application In Mines Containing Water

With the rapid development of the economy, the national demand for mineral source is increasing. However, the easily exploited resource is fading away and the exploitation of the mine in complicated hydrogeological saturated conditions is being explored with the idea of sustainable development. The mining lies in the underground water and is usually saturated. The existing water plays major role on the mechanics and stable properties. Meanwhile, the geotechnical engineering is often affected by the underground water and loading during the construction and operation. In order to seek precursory information from stabilization to unsteadiness, the damage and failure information in different loading path and different loading stage is researched. The results are important for the stabilization monitoring and disaster warning in factual engineering.The paper focuses on the theme of rock damage properties with water interaction. The main work is conducting the dry and saturated rock in different loading path and monitoring acoustic emission (AE), analyzing the effect of water on the mechanics and AE properties, and further developing the rock dynamical damage evolution mathematics model based on the AE characteristic parameters and dissipation strain energy. The main conclusions are as follows:1. Longitudinal wave measurement, uniaxial loading, shear, and tension experiments of diorite and limestone in the condition of dry, saturated and different dipping time were conducted. The effect of water content and dipping time on the mechanics properties was analyzed.2. The AE experiments of diorite and limestone in the condition of dry, saturated and different dipping time were conducted. The effect of water on AE was analyzed, and furthermore, the damage model based on the time effect was established with the opinion of accumulated AE events can represent the damage value.3. The uniaxial loading and cyclic loading experiments and AE experiments of dry and saturated rock were conducted. The energy, AE, accumulated energy, and dissipation energy were analyzed. Damage value based on the accumulated events and dissipated energy for dry and saturated rock are alos analyzed. According to the complementation of the dissipated energy and damage value based on the AE, the dissipated energy and damage value variation law were analyzed in uniaxial loading and cyclic loading experiments.4. Based on the load-unload response ratio theory and energy accelerated release, the precursory information of dry and saturated specimens of loading and cyclic loading was discussed. And the Felicity ratio and AE characteristic variation laws with the cyclic time were analyzed.5. The inner dynamical damage evolution based on the AE events position of diorite limestone and limestone in the condition of dry and saturated were analyzed. Combining the energy counts, the crack development was studied by analyzing the crack development of different moisture specimens. The effect of water on rock failure and crack development was also discussed.6. Based on the Hoke-Brown strength criterion, the static strength of the rock mess of different dipping time in water was studied combining the geometric parameters of rock structural plane in site and the parameters obtained in the laboratory with different moisture.7. The Zhongguan mine plugging water curtain and surrounding rock was taken as engineering case. With the hydrogeology, engineering geology material, the three dimensional mechanical model was built. Based on the physical mechanical parameters of rock mass, the multi-physics field analysis software COMSOL Multi-physics was used to simulate the steady of the plugging water curtain in the condition of the underground water and mining disturbance. On the basis of the results, the underground drainage measures were given.