Energy Evolution Law of Ore-Bearing Rock during Unloading under High Static Stress and Frequent Disturbance

Chun, Wang; Xie, Minzhu; Xiong, Zuqiang; Cheng, Lu-ping

doi:10.1155/2020/3806521

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…Furthermore, through the mechanical analysis of the excavation load release process, the transient dynamic effect of in situ stress under medium and high in situ stress was proposed and demonstrated by the construction process, especially the coupling process of different construction methods and high-level in situ stress dynamic redistribution [4]. Simultaneously, the unloading effect under high in situ stress was considered as the main inducement of a rock loosening zone [25][26][27]. The combined action of explosion and stress transient release was also confirmed by the analysis of excavation vibration [28].…”

Section: Introductionmentioning

confidence: 99%

Optimization Analysis of Excavation Procedure Design of Underground Powerhouses under High In Situ Stress in China

et al. 2021

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To recommend the excavation procedures and design parameters for underground powerhouses, excavation procedures of fifty-one underground powerhouses in China were summarized and analyzed based on in situ stress conditions. Firstly, the complex stress environment in China was introduced and fifty-one underground powerhouses with their engineering scale, size, lithology, rock classification and in situ stress level were listed in detail. Subsequently, to evaluate the influence of in situ stress levels on excavation procedure design, the correlation between excavation procedures and in situ stress level in three main excavation zones were analyzed accordingly. Moreover, to provide the excavation design recommendations, the strength–stress ratio (SSR) was promoted to analyze and recommend the design parameters, and the blasting excavation design based on the stress transient unloading control was also supplemented. The results show that excavation procedures have different priorities under different in situ stress levels, and the design parameters show an obvious relationship with in situ stress levels. Moreover, the excavation procedure parameters are suggested to adjust accordingly under different SSR. The discussion of influencing factors and specification ensures its rationality and accuracy. It is believed that the summary and recommendations can provide a good reference for excavation procedure optimization of underground powerhouse under high in situ stress.

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Section: Introductionmentioning

confidence: 99%

Optimization Analysis of Excavation Procedure Design of Underground Powerhouses under High In Situ Stress in China

et al. 2021

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Research on the Energy Dissipation Patterns and Fragment Size Distribution Characteristics of Coal Under Cyclic Impact Loading With Confining Pressure

Yongliang,

Yuping,

Chuantian

et al. 2024

Geofluids

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This study examines energy dissipation patterns and failure mechanisms in coal under cyclic impact, crucial for preventing dynamic disasters like rock bursts and coal and gas outbursts. Using a 75‐mm split Hopkinson pressure bar (SHPB) experimental system, the dynamic mechanical characteristics and fragment size distribution patterns of coal samples were analysed under a confining pressure of 10 MPa, axial pressure of 12 MPa, and impact pressures of 0.25, 0.30, 0.35, 0.40, and 0.45 MPa for 1, 2, and 3 cycles. The experimental data indicate that as the number of impacts increases, the energy reflected by the coal samples gradually increases, while the transmitted energy correspondingly decreases. The energy absorbed per unit volume of the coal samples under the first, second, and third dynamic loading cycles and confining pressure is 0.56, 0.61, and 0.66 J/cm3, respectively, with energy absorption rates ranging from 16.2% to 33.8%. Under different impact pressures, the fractal dimension of coal fragmentation shows a linear change, and as the impact pressure increases, the degree of fragmentation intensifies, and the mass of the fragmented coal decreases. The strength reduction in the energy dissipation patterns of coal samples under dynamic loading provides important theoretical support for the prevention of rock bursts during coal mining.

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Energy Evolution Law of Ore-Bearing Rock during Unloading under High Static Stress and Frequent Disturbance

Cited by 2 publications

References 34 publications

Optimization Analysis of Excavation Procedure Design of Underground Powerhouses under High In Situ Stress in China

Optimization Analysis of Excavation Procedure Design of Underground Powerhouses under High In Situ Stress in China

Research on the Energy Dissipation Patterns and Fragment Size Distribution Characteristics of Coal Under Cyclic Impact Loading With Confining Pressure

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