| 闫寿庆,王国徽,赵宇,聂长波,杨逾.不同煤层厚度比组合体力学行为及能量演化规律研究[J].矿产勘查,2025,16(10):2369-2376 |
| 不同煤层厚度比组合体力学行为及能量演化规律研究 |
| Study on the mechanical behavior and energy evolution patterns of coal-rock composite specimens with different height ratios |
| 投稿时间：2024-06-04 |
| DOI：10.20008/j.kckc.202510013 |
| 中文关键词: 煤岩组合体 煤层厚度比 能量演化 力学损伤 |
| 英文关键词: coal-rock composite coal seam height ratio energy evolution mechanical damage |
| 基金项目:本文受国家重点研发计划项目(2018YFC0604705)、国家自然科学基金项目(51774167)和辽宁省重点实验室项目(LJZS002)联合资助。 |
|
| 摘要点击次数: 188 |
| 全文下载次数: 97 |
| 中文摘要: |
| 煤层开采将导致其与顶底板共同组成的力学系统改变原有平衡状态，系统内部发生能量的快速积聚与耗散，不同煤层厚度比势必影响能量的传递和扩散路径。通过对不同厚度比的岩-煤-岩组合体开展单轴压缩试验，研究组合体力学特征及其能量演化特征，揭示煤-岩井巷围岩层间的破坏变形规律。研究结果表明:不同煤层厚度比组合体渐进性破坏中，稳定损伤期为主要的储能阶段，弹性应变能 Ue随着轴向应变增加呈现线性变化，失稳破坏期间以释放和耗散为主；随着煤层厚度比的增加，组合体能量耗散率逐渐增大，煤层厚度比 hcou=0.5时能量耗散率分别为 hcou=0.1、hcou=0.2、hcou=0.3时的 5.02、1.10、1.01倍；根据组合体破坏形态及 PFC颗粒流软件模拟结果，随着煤层厚度比 hcou的增大，组合体中部煤层压裂破坏趋势显著增强，岩层区域衍生裂隙发展程度低、煤层断裂次生裂纹增多，导致破坏强度不断增强；该研究成果对于了解不同煤层厚度比组合体及地层变形破坏规律与能量演化特征具有重要意义。 |
| 英文摘要: |
| Coal seam mining alters the original equilibrium state of the mechanical system formed by the coalseam and the roof and floor plates, leading to rapid energy accumulation and dissipation within the system. The ratioof different coal seam thicknesses inevitably affects the paths of energy transfer and diffusion. Through uniaxial com.pression tests on rock-coal-rock composite bodies with varying thickness ratios, this study investigates the mechani.cal characteristics of the composites and their energy evolution, revealing the deformation and failure patterns in thesurrounding rock of coal and rock tunnels. The elastic strain energy (Ue) shows a linear increase with axial strain,while the absorbed energy is primarily released and dissipated during the instability and failure period. As the coalseam thickness ratio increases, the energy dissipation rate of the composite gradually rises, with energy dissipationrates of 5.02, 1.10, and 1.01 times at thickness ratios of hcou=0.1, hcou=0.2, and hcou=0.3, when hcou=0.5. Furthermore, with an increasing coal seam thickness ratio (hcou), The trend of crack damage in the middle coal layer of the compos.ite significantly intensifies. The development of derived fractures in the rock layer remains low, while the number ofsecondary cracks in the coal layer increases, leading to a continuous enhancement of failure strength. These findingsare significant for understanding the deformation, failure patterns, and energy evolution characteristics of compos.ites with different coal seam thickness ratios and their surrounding strata. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|