层面位置对煤岩组合体动态破坏特性影响规律研究

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中文摘要：[目的]层面位置对煤岩组合体动态破坏过程及力学特性具有重要影响作用,但影响规律尚不清晰.[方法]通过对含有 3种层面位置的煤岩组合体(层面分别位于岩石部分上位、中位和下位)开展霍普金森冲击(split Hopkinson pressure bar,SHPB)实验,分析了冲击载荷条件下煤岩组合体动态应力-应变、破坏过程、能量结构、碎块特征的演变规律.[结果和结论]结果表明:(1)煤岩组合体动态应力-应变过程可以分为近似线性阶段、非线性的动态应力-应变阶段、弹性模量降低阶段、宏观破裂阶段、应力波卸载阶段 5个阶段.(2)随着层面由上向下布置,岩石部分的破坏程度逐渐增强,破坏过程逐渐剧烈,破坏后的碎块的均匀程度降低,而煤体部分的破坏程度则逐步降低,破碎后的块度逐渐增加.(3)层面的存在会降低煤岩组合体动态抗压强度,与无层面煤岩组合体(平均强度为 79.487 MPa)相比,当层面位于上方时,组合体动态抗压强度(平均强度为 73.724 MPa)降低7.25%;当层面位于中位时,组合体动态抗压强度(平均强度为 61.798 MPa)降低 22.26%;当层面位于下位时,组合体的动态抗压强度(平均强度为 64.991 MPa)降低 18.24%.(4)随着层面位置由上向下布置,能量结构发生变化,反射能占比降低,吸收能占比增加,透射能占比减小.本研究可以为超长孔水力压裂技术或地面压裂技术在大范围处理坚硬顶板工程开展过程中压裂位置的选择提供一定指导.

外文标题：Influencing analysis of bedding plane location on the dynamic failure characteristics of coal-rock combinations

外文摘要：[Objective]The bedding plane location significantly impacts the dynamic failure processes and mechanical properties of coal-rock composites,but the specific influence patterns remain unclear.[Methods]Dynamic mechanical tests were conducted on coal-rock composite specimens with bedding planes located at the top,middle,and bottom us-ing the split Hopkinson pressure bar(SHPB).The investigation focused on the dynamic stress-strain behavior,failure process,energy distribution,and fragmentation characteristics under impact loading conditions.[Results and Conclu-sions]The findings indicate that:(1)The dynamic stress-strain behavior of coal-rock composites can be segmented into five distinct stages:near-linear stage,nonlinear dynamic stress-strain stage,elastic modulus reduction stage,macroscop-ic rupture stage,and stress wave unloading stage.(2)As the bedding plane location transitions from top to bottom,the extent of rock damage increases,the failure process becomes more pronounced,and the uniformity of post-failure frag-ments decreases.Conversely,the coal component exhibits a reduction in damage severity and an increase in fragment size after failure.(3)The presence of a bedding plane significantly reduces the dynamic compressive strength of coal-rock composites.Compared to composites without a bedding plane(average strength:79.487 MPa),the dynamic com-pressive strength decreases by 7.25%(average strength:73.724 MPa)when the bedding plane is at the top,by 22.26%(average strength:61.798 MPa)when at the middle,and by 18.24%(average strength:64.991 MPa)when at the bottom.(4)The energy distribution changes as the bedding plane location shifts from top to bottom,with a reduction in reflected energy,an increase in absorbed energy,and a decrease in transmitted energy.These results provide valuable insights for optimizing fracturing positions in large-scale hard roof treatment using ultra-long hole hydraulic fracturing or surface fracturing techniques.

外文关键词：

bedding plane locationcoal-rock combinationsdynamic mechanical propertiessplit Hopkinson pressure bar(SHPB)energy structurehydraulic fracturing

作者：

郑建伟、张修峰、鞠文君、王存文、韩跃勇、李国营、陈洋、李海涛、郝晋伟、刘彪

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作者单位：

山东能源集团有限公司冲击地压防治研究中心,山东济南 250014

煤炭科学研究总院有限公司深部开采与冲击地压防治研究院,北京 100013

中煤科工开采研究院有限公司,北京 100013

煤炭科学技术研究院有限公司安全分院,北京 100013

陕西煤业化工集团有限责任公司,陕西西安 710065

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关键词：

层面位置煤岩组合体动态抗压强度 SHPB 能量结构水力压裂

基金：

国家自然科学基金项目国家自然科学基金项目天地科技股份有限公司科技创新创业资金专项重点项目山东能源集团2023年重点科技项目

项目编号：

52404128523742062024TD-ZD002SNKJ2023BJ15-R42

出版年：

2024

DOI：

10.12363/issn.1001-1986.24.04.0253

煤田地质与勘探

中煤科工集团西安研究院

煤田地质与勘探

CSTPCD北大核心

影响因子：1.079

ISSN：1001-1986

年,卷(期)：2024.52(10)

参考文献量23