Abstract
The energy conversion in rocks has an important significance for evaluation of the stability and safety of rock engineering. In this paper, some uniaxial compression tests for fifteen different rocks were performed. The evolution characteristics of the total energy, elastic energy, and dissipated energy for the fifteen rocks were studied. The dissipation energy coefficient was introduced to study the evolution characteristics of rock. The evolution of the dissipation energy coefficient for different rocks was investigated. The linear interrelations of the dissipation energy coefficients and the yield strength and peak strength were explored. The method was proposed to determine the strength of rock using the dissipation energy coefficients. The results show that the evolution of the dissipation energy coefficient exhibits significant deformation properties of rock. The dissipation energy coefficients linearly increase with the compaction strength, but decrease with the yield strength and peak strength. Moreover, the dissipation energy coefficient can be used to determine the rock burst proneness and crack propagation in rocks.
Highlights
Geotechnical engineering problems in civil, mining, and petroleum engineering practices [1]: the mechanical properties of rock have become the most common measurement in most rock mass classification systems [2, 3]
Meng et al [9] experimentally studied the characteristics of energy in uniaxial cyclic loading and unloading compression of sandstone rock under six different loading rates and proposed that the energy evolution of rock is closely related to the axial loading stress, rather than the axial loading rate
E elastic deformation stage (AB): the point B is called the yield point, which is the second characteristic point of the curve. e dissipation energy coefficient λ decreases as the stress increases and reaches the minimum value at the yield point B. e reason is the microcracks in the rock are completely closed at this stage, and the total energy is basically converted into the elastic energy
Summary
Geotechnical engineering problems in civil, mining, and petroleum engineering practices [1]: the mechanical properties of rock have become the most common measurement in most rock mass classification systems [2, 3]. Some researchers have carried out experimental studies and numerical simulations on the variation of energy in the deformation and failure process of rocks. Ju et al [7] built a three-dimensional finite element model of the porous rock-like medium and investigated mechanisms of deformation and failure and energy dissipation rule of porous rock-like media. Wang and Cui [10] revealed the relation between energy change and confining pressure during the process of sandstone damage and characteristics of energy storage and energy dissipation in different deformation stage. Ma et al [13] studied the energy dissipation mechanism of the rock deformation process under the influence of freeze-thaw cycles. A few studies have emphasized the relationship between energy and strength of rock during the rock deformation and failure process [18, 19]. The linear relationship between the dissipation energy coefficient and the strength of rock was established
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