Experimental Study on the Characteristics of Energy Accumulation before Peak in Coal Rock Combinations with Different Dip Angles

IF 1.9 4区工程技术 Q3 ENGINEERING, CIVIL

KSCE Journal of Civil Engineering Pub Date : 2024-07-22 DOI:10.1007/s12205-024-1497-2

Zhai-nan Zhang, Ke Yang, Xin Lyu, Xiao-lou Chi, Wenjie Liu

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Abstract

The influence of water content and dip angle conditions on the pre peak energy accumulation characteristics of coal rock assemblages and their mechanism of action are crucial for studying the stability of high dip angle coal seams. The results indicate that water content changes the peak strength turning point. The accumulated energy before the peak gradually decreases from 0° to 60° and increases at 60° to 90°. As the inclination angle of the interface increases, the pre peak energy accumulation decreases. As the water content increases, the proportion of coal components gradually increases, while the proportion of rock components gradually decreases, and the energy accumulated before the peak of coal components is greater than that of rock components. The energy reduction rate gradually increases from 0° to 60° and decreases from 60° to 90°. When the inclination angle of the interface is 0° ∼ 30°, 30° ∼ 60°, and 90°, the main mechanism affecting its stability is the combined effect of water weakening, water weakening, and interface slip, as well as the uneven deformation of the coal rock interface.

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不同倾角煤岩组合峰前能量累积特征的实验研究

含水量和倾角条件对煤岩组合峰前能量累积特征的影响及其作用机理对研究高倾角煤层的稳定性至关重要。结果表明，含水量会改变峰值强度转折点。峰值前的累积能量从 0°到 60°逐渐减少，在 60°到 90°时逐渐增加。随着界面倾角的增大，峰前能量累积减少。随着含水量的增加，煤组分的比例逐渐增大，而岩石组分的比例逐渐减小，煤组分的峰前累积能量大于岩石组分。能量降低率从 0° 到 60° 逐渐增大，从 60° 到 90° 逐渐减小。当界面倾角为0°∼30°、30°∼60°、90°时，影响其稳定性的主要机理是水削弱、水削弱和界面滑移以及煤岩界面不均匀变形的综合作用。

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来源期刊

KSCE Journal of Civil Engineering ENGINEERING, CIVIL-

CiteScore

4.00

自引率

9.10%

发文量

329

审稿时长

4.8 months

期刊介绍： The KSCE Journal of Civil Engineering is a technical bimonthly journal of the Korean Society of Civil Engineers. The journal reports original study results (both academic and practical) on past practices and present information in all civil engineering fields. The journal publishes original papers within the broad field of civil engineering, which includes, but are not limited to, the following: coastal and harbor engineering, construction management, environmental engineering, geotechnical engineering, highway engineering, hydraulic engineering, information technology, nuclear power engineering, railroad engineering, structural engineering, surveying and geo-spatial engineering, transportation engineering, tunnel engineering, and water resources and hydrologic engineering