岩土力学 ›› 2023, Vol. 44 ›› Issue (S1): 623-633.doi: 10.16285/j.rsm.2022.1064

• 数值分析 • 上一篇    下一篇

原生煤岩组合体界面力学效应数值模拟研究

王凯1, 2，付强2，徐超1, 2, 3，艾子博2，李丹2，王磊4，舒龙勇5   

  1. 1. 中国矿业大学（北京） 共伴生能源精准开采北京市重点实验室，北京100083；2. 中国矿业大学（北京） 应急管理与安全工程学院，北京 100083；3. 阳泉煤业（集团）有限责任公司博士后科研工作站，山西 阳泉 045000；4. 安徽理工大学 深部煤矿采动响应与灾害防控国家重点实验室， 安徽 淮南 232001；5. 煤炭科学技术研究院有限公司安全分院，北京 100013
  • 收稿日期:2022-07-07 接受日期:2022-08-14 出版日期:2023-11-16 发布日期:2023-11-21
  • 通讯作者: 徐超，男，1988年生，博士，副教授，博士生导师，从事煤岩瓦斯动力灾害防治的研究。E-mail: xuchao@cumtb.edu.cn E-mail: kaiwang@cumtb.edu.cn
  • 作者简介:王凯，男，1972年生，博士，教授，博士生导师，主要从事安全科学与工程领域的教学与科研工作。
  • 基金资助:
    国家自然科学基金项目（No.51974321，No.52130409，No.52121003）；中央高校基本科研业务费专项资金资助（No.2023JCCXAQ03）

Numerical simulation of interface mechanical effects of primary coal-rock combination

WANG Kai1, 2, FU Qiang2, XU Chao1, 2, 3, AI Zi-bo2, LI Dan2, WANG Lei4, SHU Long-yong5   

  1. 1. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 100083, China; 2. School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 3. Postdoctoral Research Station, Yangquan Coal industry (Group) Co., Ltd., Yangquan, Shanxi 045000, China; 4. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 5. Mine Safety Technology Branch, China Coal Research Institute, Beijing 100013, China
  • Received:2022-07-07 Accepted:2022-08-14 Online:2023-11-16 Published:2023-11-21
  • Supported by:
    The work was supported by the National Natural Science Foundation of China (51974321, 52130409, 52121003) and the Fundamental Research Funds for the Central Universities (2023JCCXAQ03).

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摘要： 原生煤岩组合体界面是非均质的且包含大量复杂的微观结构。为透明求解非均质煤岩界面导致的复杂物理场，采用工业CT对原生煤岩组合体试件进行了扫描试验，重构了原生煤岩组合体界面三维模型，计算了非均质煤岩界面的分形维数；基于此建立了原生煤岩组合体数值模拟模型，模拟分析了单轴压缩条件下原生煤岩组合体的应力及损伤特征，并通过煤岩组合体单轴压缩试验结果验证了数值模拟规律的可靠性。研究结果表明：原生煤岩组合体界面具有复杂的微观结构且具有分形特征，分形维数能够反映界面宏观形态；单轴压缩状态下，原生煤岩组合体中垂向应力呈非均匀分布，煤岩界面的存在会在煤体中派生水平压应力，在岩石中派生水平拉应力，煤岩界面附近水平应力呈拱形分布；原生煤岩组合体的损伤破坏主要发生在煤体中，煤体的损伤首先发生在远离界面的煤体中并逐渐向界面处扩展，界面分形维数与试件出现初始损伤对应的轴压呈正相关；由于煤岩界面压应力拱的存在导致原生煤岩组合体整体的强度高于煤体，破坏后的煤体呈拱形分布。预期研究结果对于煤岩动力灾害防治具有一定意义。

关键词: 原生煤岩组合体, 工业CT扫描, 界面特征, 单轴压缩, 数值模拟

Abstract: The interface of primary coal-rock combination is heterogeneous and contains a lot of complex microstructure. In order to solve the complex physical field caused by heterogeneous coal-rock interface transparently, industrial CT was used to scan the specimens of primary coal-rock combination. The three-dimensional model of primary coal-rock mass interface was reconstructed, and the fractal dimension of heterogeneous coal-rock interface was calculated. Based on this, a numerical simulation model of primary coal and rock mass was established, and the stress and damage characteristics of primary coal-rock combination under uniaxial compression were simulated and analyzed. The reliability of the numerical simulation law was verified by the uniaxial compression test results of coal-rock combination. The results show that: the interface of primary coal-rock combination has complex microstructure and fractal characteristics, and the fractal dimension can reflect the macroscopic morphology of interface. Under uniaxial compression, the vertical stress in the primary coal-rock combination exhibits non-uniform distribution. The presence of coal-rock interface induces horizontal compressive stress in the coal body and horizontal tensile stress in the rock, and the horizontal stress near the coal-rock interface presents an arch distribution. The damage of the primary coal-rock combination mainly occurs in the coal, and the damage of the coal body first occurs in the coal far away from the interface and gradually expands to the interface. The higher the fractal dimension of the interface is, the smaller the axial compression is when the initial damage occurs. Due to the existence of compressive stress arch at the coal-rock interface, the strength of the coal-rock combination is higher than that of the coal mass, and the coal mass after failure is arched. The expected research results are of significance for the prevention and control of coal and rock.

Key words: primary coal-rock combination, industrial CT scan, interface characteristics, uniaxial compression, numerical simulation

中图分类号: O242
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