含水煤样剪切破坏损伤规律试验研究.pdf

国家自然科学基金资助（51304208） 江苏高校优势学科建设工程资助项目 硕士学位论文 含水煤样剪切破坏损伤规律试验研究 Experimental Study on Shear Damage Law of Water-Bearing Coal Samples 作 者牛钦环 导 师李学华 教授 中国矿业大学 二○一七年五月 中图分类号 TD315 学校代码 10290 UDC 622 密 级 公开 中国矿业大学 硕士学位论文 含水煤样剪切破坏损伤规律试验研究 Experimental Study on Shear Damage Law of Water-Bearing Coal Samples 作 者 牛钦环 导 师 李学华 申请学位 工学硕士 培养单位 矿业工程学院 学科专业 采矿工程 研究方向 岩体力学与岩层控制 答辩委员会主席 冯光明 评 阅 人 姚强岭、冯子军 二○一七年五月 学位论文使用授权声明学位论文使用授权声明 本人完全了解中国矿业大学有关保留、 使用学位论文的规定， 同意本人所撰写 的学位论文的使用授权按照学校的管理规定处理 作为申请学位的条件之一，学位论文著作权拥有者须授权所在学校拥有学位 论文的部分使用权， 即 ①学校档案馆和图书馆有权保留学位论文的纸质版和电子 版，可以使用影印、缩印或扫描等复制手段保存和汇编学位论文；②为教学和科研 目的， 学校档案馆和图书馆可以将公开的学位论文作为资料在档案馆、 图书馆等场 所或在校园网上供校内师生阅读、浏览。另外，根据有关法规，同意中国国家图书 馆保存研究生学位论文。 （保密的学位论文在解密后适用本授权书） 。 作者签名 导师签名 年 月 日 年 月 日 致 谢 致 谢 廊桥幽幽，镜湖相伴，是我美丽的校园。转眼间，我已经在美丽的矿大又度过了三 个年头。 三年， 这是我人生中非常重要的三年， 我有幸能够接触到这些不仅传授我知识、 学问，而且从更高层次指导我的人生与价值追求的良师。他们使我坚定了人生的方向， 获得了追求的动力，留下了大学生活的美好回忆。在此，我真诚地向我尊敬的老师们和 母校表达我深深的谢意 首先要感谢恩师李学华教授，从大三到现在，无论是从本科毕业设计还是从硕士论 文撰写，无论是学习上还是生活上、工作上，都得到了李老师悉心的指导和照顾。在此 期间，深受李老师教诲之恩，栽培之德，李老师渊博的学术修养和新锐的科研态度，乐 观向上的人生态度以及待人接物的修养让我受益匪浅。师从李老师，倍感荣幸，在此谨 向李老师表示我最诚挚的敬意和感谢 研究生三年里，得到了课题组瞿老师、姚老师、梁师兄的很多帮助。瞿老师平易近 人、乐观向上、工作严谨，为课题组营造了积极向上、团结奋进的学习氛围，使大家能 够专心科研，心无旁骛；姚老师真诚豁达的性格，干练稳重的工作作风、求真务实的科 研态度一直是我学习的榜样。尤其是在论文完成过程中，多次查阅论文进度，并在研究 思路和方法上给予宝贵的建议，正是与姚老师的探讨，论文才能最终完成；梁师兄稳重 细心、待人平和，在三年的学习和生活中一直不厌其烦的指导我,每想起都感念至深。 感谢谭英明硕士、 武越超硕士， 感谢你们在这三年的学习和生活中帮助我、 包容我。 感谢陈田硕士，在论文撰写中给予很大帮助。还要感谢课题组的师兄弟们，感谢你们在 论文试验和平时生活中给予的帮助，也要感谢你们在课题组时给大家带来的欢声笑语。 我还要感谢我的父母和家人对于我这么多年来的支持，你们让我更加乐观地面对生 活中的一切，你们对我如此无私的付出，我会用一生去回报。 感谢各位专家和教授在百忙之中评审本文，衷心希望得到您的指导和帮助。 最后，感谢所有关心我、爱护我的亲人和朋友。 牛钦环 2017.05 I 摘摘 要要 西部矿区逐渐成为我国煤炭资源开发的重点， 但水资源的匮乏却成为制约当地煤炭 资源开发的瓶颈。因此，煤水共采已刻不容缓，而目前煤水共采方法主要包括保水开采 和地下水库技术，尤其是地下水库技术已在神东矿区大规模推广应用。地下水库的稳定 性与人工坝体和煤柱坝体的稳定性密切相关， 其中煤柱坝体的失稳破坏不仅与其所受的 荷载相关， 亦受到水的侵蚀作用的影响。 因此， 研究不同含水率下煤样的剪切破坏特征， 对揭示地下水库煤柱坝体在水作用下的变形特征有着重要意义。 论文以含水煤样剪切破坏损伤规律为主要研究对象， 通过压剪试验对煤样剪切破坏 强度及特征参数进行系统研究。 利用声发射及红外辐射等研究手段对不同含水率下煤样 剪切过程进行反演和分析，得到不同含水状态下煤样剪切破坏声发射及红外辐射特征， 并以此为建立模型，对含水煤样剪切破坏过程损伤规律进行分析。 论文从吸水性实验入手，首先确定 5 个浸水时间点；通过剪切试验表明随着含水率 的升高， 煤样的抗剪强度逐渐降低， 二者之间呈指数降低的关系。 并对剪切强度参数 c、 φ 进行分析得出，煤样浸水后二者均呈下降趋势，同时基于含水率对摩尔库伦破坏准则 参数进行修正；通过对试样剪切过程声发射参数研究，得到声发射计数及能率特征与应 力应变曲线变化趋势具有相关性，即随着含水率的升高，声发射计数及能率特征越不明 显；通过对剪切过程红外特征参数 AIRT 的分析，得到随着含水率增加，AIRT 温变幅度 不断降低， 最高及最低辐射温度呈现相同的趋势。 并结合表面辐射温度熵及方差等参数， 得到含水率越高，表面温度方差越小的趋势；通过建立以声发射计数特征为基础的整体 损伤变量以及以红外辐射温变点为基础的表面损伤变量。 得到整体损伤变量在反映煤样 更具前兆性和阶段性，而表面损伤变量则在峰值破坏阶段与应力-时间曲线拟合度更高。 最后对煤样剪切破坏损伤模型作出评价，为研究坝体煤柱稳定性提供可靠的判定依据。 该论文有图 35 幅，表 16 个，参考文献 103 篇。 关键词关键词含水率；剪切破坏；损伤；声发射；红外辐射。 II Abstract Abstract The western mining area has gradually become the focus of coal resources development in China, but the lack of water resources has become the bottleneck restricting the development of local coal resources. Therefore, coal and water co extraction is imperative. At present, the coal water co production s mainly include water preserved mining technology and underground reservoir technology. Especially the underground reservoir has large-scale application in Shendong mining area. The stability of the underground reservoir is closely related to the stability of the artificial dam and the pillar. The failure of the coal pillar dam is not only related to the load, but also affected by the erosion of water. Therefore, the study of shear failure characteristics of coal samples under different water content is great significance to reveal the deation characteristics of coal pillar-dam under the action of water. In this paper, the main research object is the damage law of shear failure of water bearing coal samples . The shear failure strength and characteristic parameters of coal samples are systematically studied by compression shear test. By means of acoustic emission and infrared radiation, the shear process of coal samples with different moisture content is inversed and analyzed, then we obtain the acoustic emission and infrared radiation characteristics of coal samples under different water cut conditions, and taking this as a model, the damage law of the shear failure process of water bearing coal samples is analyzed. The paper starting with water absorption experiment, we determined 5 soaking time points at first; The shear test shows that the shear strength of the coal sample decreases gradually with the increase of water content, and the relationship between the two decreases exponentially. And the shear strength parameters of c and ψ were analyzed, two coal samples after immersion were decreased, At the same time, based on the moisture content, corrected the Mohr Kulun failure criterion parameters. Through the research on the acoustic emission parameters of shear process, AE counts and energy characteristics and correlation with changes of stress strain curve, namely with the increase of water cut, acoustic emission counts and energy characteristics is not obvious; By analyzing the infrared characteristic parameter AIRT of the shearing process, it is found that the temperature range of AIRT decreases continuously with the increase of water content, and the highest and lowest radiation temperatures exhibit the same trend. Combined with the parameters of surface radiation temperature, entropy and variance, the higher the moisture content, the smaller the variance of the surface temperature; By establishing the integral damage variables based on the acoustic emission counting characteristics and the surface damage variables based on the infrared radiation temperature change point. The overall III damage variable shows that the coal sample is more precursory and periodic, while the surface damage variable is more fitted to the stress time curve at the peak failure stage. Finally, the coal shear damage model is uated, which provides a reliable basis for the study of the stability of the coal pillar. There are 35 figures, 16 tables and 103 references in this paper. Key words Moisture content; Shear failure ; Damage variable ; AE ; Infrared radiation. IV 目目 录录 摘摘 要要 ......................................................................................................................................... I 目目 录录 ...................................................................................................................................... IV 图清单图清单 ...................................................................................................................................... VI 表清单表清单 ...................................................................................................................................... XI 变量注释表变量注释表 ............................................................................................................................ XII 1 绪论绪论 ......................................................................................................................................... 1 1.1 研究的背景及意义 ............................................................................................................. 1 1.2 国内外研究现状 ................................................................................................................. 1 1.3 研究内容及方法 ................................................................................................................. 7 2 试验方案设计试验方案设计 ........................................................................................................................ 9 2.1 煤样的选取与制备 ............................................................................................................. 9 2.2 试验的实验设备与方法 ................................................................................................... 10 2.3 含水煤样剪切实验内容及步骤 ....................................................................................... 17 2.4 本章小结 ........................................................................................................................... 20 3 含水煤样剪切破坏声发射特征研究含水煤样剪切破坏声发射特征研究 ................................................................................... 21 3.1 煤样吸水性试验结果分析 ............................................................................................... 21 3.2 抗剪强度及其特征参数分析 ........................................................................................... 23 3.3 含水煤样剪切破坏声发射特征分析 ............................................................................... 33 3.4 本章小结 ........................................................................................................................... 43 4 含水煤样剪切破坏红外辐射特征研究含水煤样剪切破坏红外辐射特征研究 ............................................................................... 45 4.1 红外热成像技术简介 ....................................................................................................... 45 4.2 剪切作用下煤体表面 AIRT 变化特征分析 .................................................................... 46 4.3 剪切作用下煤体表面红外热像变化特征分析 ............................................................... 54 4.4 本章小结 ........................................................................................................................... 58 5 含水煤样剪切破坏损伤演化规律研究含水煤样剪切破坏损伤演化规律研究 .............................................................................. 60 5.1 含水煤样剪切破坏声发射及红外辐射前兆特征分析 ................................................... 60 5.2 损伤变量的定义 ............................................................................................................... 62 5.3 含水煤样剪切破坏损伤规律研究 ................................................................................... 64 5.4 本章小结 ........................................................................................................................... 67 V 6 结论结论 ...................................................................................................................................... 68 参考文献参考文献 .................................................................................................................................. 70 作者简历作者简历 .................................................................................................................................. 76 学位论文原创性声明学位论文原创性声明 .............................................................................................................. 77 学位论文数据集学位论文数据集 ...................................................................................................................... 78 VI Contents Abstract .................................................................................................................................... II Contents ................................................................................................................................... VI List of Figures ...................................................................................................................... VIII List of Tables ........................................................................................................................... XI List of Variables ................................................................................................................... XII 1 Introduction ........................................................................................................................... 1 1.1 Research Background and Significance ............................................................................... 1 1.2 Research Situation at Home and Abroad ............................................................................. 1 1.3 Research Contents and s .......................................................................................... 7 2 Experiment Scheme Design .................................................................................................. 9 2.1 Preparation of Test Mining Sample ..................................................................................... 9 2.2 Test Equipments and s ........................................................................................... 10 2.3 Test Content and Steps ....................................................................................................... 17 2.4 Brief Summary ................................................................................................................... 20 3 Study on Shear Strength and AE Characteristics of Water-Bearing Coal Samples .... 21 3.1 Experiment of Water Absorption of Coal Sample ............................................................. 21 3.2 Analysis of Shear Strength and Its Characteristic Parameters ........................................... 23 3.3 Analysis of AE Characteristics of Shear Failure of Water-Bearing Coal Samples ........... 33 3.4 Brief Summary ................................................................................................................... 43 4 Study on Infrared Radiation Characteristics of Shear Failure of Water-Bearing Coal Samples .................................................................................................................................... 45 4.1 The Infrared Thermal Imaging Technology ....................................................................... 45 4.2 Analysis of Characteristics of AIRT Change on Coal Surface under Shear Action .......... 46 4.3 Analysis of Infrared Thermal Image Characteristics of Coal Surface under Shear Action 54 4.4 Brief Summary ................................................................................................................... 58 5 Study on Damage Evolution Law of Shear Failure of Water Bearing Coal Sample .... 60 5.1 Analysis of Precursory Ination of AE and Infrared Radiation about Shear Failure of Water Bearing Coal Samples ................................................................................................... 60 5.2 Establishment of Damage Model ....................................................................................... 62 VII 5.3 Research of Damage Evolution Law of Shear Failure of Water Bearing Coal Samples ... 64 5.4 Brief Summary ................................................................................................................... 67 6 Conclusions .......................................................................................................................... 68 References ............................................................................................................................... 70 Author’s Resume .................................................................................................................... 76 Declaration of Thesis Originality .......................................................................................... 77 Thesis Data Collection ..............................................