Abstract
This paper uses the RFPA numerical simulation software to establish a numerical model of the rheological failure of the rock mass under stress. Rheological failure characteristics of the body was researched, and the results shows: (1) The rupture sequence of rock rupture is from the corner to the middle. When the rock loses stability under pressure, the rock often ruptures from the corner. The corner gradually collapses and cracks. Then the cracks spread to the middle of the rock. Many cracks extending from the corners are in the rock. The central part intersects each other and eventually causes the rock to break. (2) Rock samples of different lithologies have different stress values when they break under the same confining pressure. From the experimental process, we know that granite>sandstone>mudstone. Therefore, the higher the strength of the rock, the harder the rock will be broken. (3) The weaker the plasticity at rupture, the stronger the brittleness and the stronger the sudden change of rupture. In the deep mining process, the greater the confining pressure, the more obvious the rheological characteristics of the rock, and the greater the total energy released during the rock failure process.
Highlights
With my China’s economic development and social progress, the demand for mineral resources has gradually increased, and the development technology of deep ground resources has continued to advance
In the deep mining process, the greater the confining pressure, the more obvious the rheological characteristics of the rock, and the greater the total energy released during the rock failure process
Wang Weijun [7] analyzed the formation and development process of plastic zone in high-stress soft rock roadway, and pointed out that the key to ensuring the stability of roadway surrounding rock is to control the local distortion of plastic ring and malignant expansion of plastic zone
Summary
With my China’s economic development and social progress, the demand for mineral resources has gradually increased, and the development technology of deep ground resources has continued to advance. The stability and rheological properties of deep high-stress coal has always been the focus and difficulty of mining workers. Heap et al [3] and Martin et al [4] conducted creep tests of sandstone, granite, basalt and other rocks under conventional triaxial compression conditions to study the failure events, velocity, compression deviator stress, surrounding rock and pore pressure of this phenomenon. The rheological characteristics of rock masses under high stress are still unclear [10]. Revealing the rheological failure conditions and precursor characteristics of rocks, and revealing the law and mechanism of the influence of high stress conditions on the failure of rock masses [15]. In order to verify the failure characteristics of different lithological rocks, this paper selects three types of rocks such as mudstone, sandstone and granite for numerical simulation calculation.
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