Modified Model and Simulation Verification of Rock-Fatigue Damage Considering Repeated Discharge Impact

Guo, Jianchun; Li, Xinyang; Lu, Cong; Zhu, Xiwen; Huang, Kun; Xu, Shuping

doi:10.3390/pr11082366

Cited by 2 publications

(1 citation statement)

References 30 publications

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“…In the research field of rock fatigue characteristics, it has been found that factors such as loading frequency, temperature, stress amplitude, and cycle number in cyclic loading and unloading tests mainly affect the strength of rock mass [3][4][5]. With more in-depth research, many scholars have become concerned about fatigue damage [6][7][8] and the energy dissipation mechanism [9][10][11] of rock during cyclic loading. Sun et al [12] deduced a damage variable according to the strength characteristics and energy evolution law in the cyclic loading process.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties of Rock–Concrete Composite Specimens under Cyclic Loading

Li,

Zhao,

Hou

et al. 2024

Buildings

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The foundations of bridges and other tall buildings are often subjected to cyclic loads. Therefore, it is essential to investigate the mechanical properties of rock–concrete composite foundations under cyclic loads. In this paper, uniaxial cyclic loading and unloading tests were conducted on rock–concrete composite specimens using the TFD-2000 microcomputer servo-controlled rock triaxial testing machine. The stress–strain curves, elastic modulus variation, and energy dissipation were analyzed. The results showed that the stress–strain curves of composite specimens under uniaxial cyclic loading and unloading conditions formed hysteresis loops. The hysteresis loop exhibited a sparse–dense–sparse pattern under the upper stress of 27.44 MPa, which was 90% of the uniaxial strength. The elastic modulus, as well as the dissipated energy, decreased rapidly in the first few cycles and then gradually decreased at a constant rate, with the upper stress increasing to 27.44 MPa. Both the elastic modulus and the dissipated energy exhibited an accelerated stage before specimen failure. The primary failure mode of the composite specimen was split failure from concrete to sandstone. A damage variable was derived to better reflect the laws governing the damage evolution of the composite under cyclic loads.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties of Rock–Concrete Composite Specimens under Cyclic Loading

Li,

Zhao,

Hou

et al. 2024

Buildings

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Research advances in enhanced coal seam gas extraction by controllable shock wave fracturing

Fan,

Sun,

et al. 2024

Int J Coal Sci Technol

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With the continuous increase of mining in depth, the gas extraction faces the challenges of low permeability, great ground stress, high temperature and large gas pressure in coal seam. The controllable shock wave (CSW), as a new method for enhancing permeability of coal seam to improve gas extraction, features in the advantages of high efficiency, eco-friendly, and low cost. In order to better utilize the CSW into gas extraction in coal mine, the mechanism and feasibility of CSW enhanced extraction need to be studied. In this paper, the basic principles, the experimental tests, the mathematical models, and the on-site tests of CSW fracturing coal seams are reviewed, thereby its future research directions are provided. Based on the different media between electrodes, the CSW can be divided into three categories: hydraulic effect, wire explosion and excitation of energetic materials by detonating wire. During the process of propagation and attenuation of the high-energy shock wave in coal, the shock wave and bubble pulsation work together to produce an enhanced permeability effect on the coal seam. The stronger the strength of the CSW is, the more cracks created in the coal is, and the greater the length, width and area of the cracks being. The repeated shock on the coal seam is conducive to the formation of complex network fracture system as well as the reduction of coal seam strength, but excessive shock frequency will also damage the coal structure, resulting in the limited effect of the enhanced gas extraction. Under the influence of ground stress, the crack propagation in coal seam will be restrained. The difference of horizontal principal stress has a significant impact on the shape, propagation direction and connectivity of the CSW induced cracks. The permeability enhancement effect of CSW is affected by the breakage degree of coal seam. The shock wave is absorbed by the broken coal, which may hinder the propagation of CSW, resulting in a poor effect of permeability enhancement. When arranging two adjacent boreholes for CSW permeability enhancement test, the spacing of boreholes should not be too close, which may lead to negative pressure mutual pulling in the early stage of drainage. At present, the accurate method for effectively predicting the CSW permeability enhanced range should be further investigated.

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Modified Model and Simulation Verification of Rock-Fatigue Damage Considering Repeated Discharge Impact

Cited by 2 publications

References 30 publications

Experimental Study on the Mechanical Properties of Rock–Concrete Composite Specimens under Cyclic Loading

Experimental Study on the Mechanical Properties of Rock–Concrete Composite Specimens under Cyclic Loading

Research advances in enhanced coal seam gas extraction by controllable shock wave fracturing

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