Study on Roof Deformation and Failure Law of Close Distance Coal Seams Mining Based on Digital Image Correlation

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Experimental Techniques Pub Date : 2024-05-13 DOI:10.1007/s40799-024-00717-w

S. L. Yang, Q. Li, H. Yue, D. Z. Kong, G. Y. Wu, S. Yang, F. Q. Liu

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Abstract

In order to research the laws of roof collapsing and overlaying stratum movement in close distance coal seams mining and prevent roof accidents during such mining. The close distance coal seams mining in a coal mine is used as the study subject in this study, and a similar simulation experiment is conducted. A similar simulation experiment of the close distance coal seams is seen using the digital image correlation. The evolution of roof displacement–strain in the mining process is researched, along with the roof caving features in various coal seam mining processes. The evolution law of roof stress-displacement is revealed in the mining process of close distance coal seams which provides the basis for the roof stability control in close distance coal seams. Lower coal seam mining in close distance coal seams has a larger degree of abutment pressure stress concentration and a higher level of advanced abutment pressure intensity. Greater harm is caused by lower coal seam roof strata mining than by single coal seam mining. The stope support strength design must take upper goaf influence into account. Therefore, to ensure the stope roof stability in close distance coal seams, it is necessary to implement roof pressure monitoring, stope roof’s grouting reinforcement, measures to improve the performance of hydraulic support, and roof effective control in close distance coal seams mining by using the principle of coordinated control.

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基于数字图像相关性的近距离煤层开采顶板变形及破坏规律研究

为了研究近距离煤层开采中顶板垮落和覆盖层移动的规律，预防近距离煤层开采中顶板事故的发生。本研究以某煤矿近距离煤层开采为研究对象，进行了类似的模拟实验。利用数字图像相关技术对近距离煤层开采进行了类似的模拟实验。研究了开采过程中顶板位移-应变的演变规律，以及各种煤层开采过程中顶板崩落的特征。揭示了近距离煤层开采过程中顶板应力-位移的演变规律，为近距离煤层顶板稳定性控制提供了依据。近距离煤层中的下煤层开采具有较大的基压应力集中程度和较高的超前基压强度。下煤层顶板分层开采比单一煤层开采造成的危害更大。因此，斜井支护强度设计必须考虑上煤层的影响。因此，在近距离煤层开采中，为确保顶板稳定，必须采用顶板压力监测、顶板注浆加固、提高液压支架性能、顶板有效控制等措施，利用协调控制原理进行近距离煤层开采。

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来源期刊

Experimental Techniques 工程技术-材料科学：表征与测试

CiteScore

3.50

自引率

6.20%

发文量

审稿时长

5.2 months

期刊介绍： Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.