考虑初始损伤的压力水浸煤岩力学特性试验研究

TD82; 矿井关闭或废弃前,采空区遗留支撑煤柱受周边工作面采动、覆岩载荷等影响,产生了一定的损伤破坏;矿井关闭或废弃后,采空区一旦形成承压积水环境,将加剧煤柱支承性能劣化,可引发其破坏失稳,造成地表突然塌陷等灾害.为研究初始损伤和压力水浸对关闭或废弃矿井遗留支撑煤柱的耦合劣化作用,基于自主研发的煤岩压力水浸试验装置,进行了5组不同初始损伤的压力水浸煤样单轴压缩试验,结合XTDIC三维全场应变测量系统、扫描电子显微镜等系统,分析了煤样强度、变形破坏与能量演化等特征,从宏细观结构演化、矿物组分变化等方面揭示了煤样力学特性劣化机制.研究结果表明:①基于煤岩黏弹塑性变形理论,将循环加卸荷产生的耗散能...

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Published in煤炭学报 Vol. 48; no. 12; pp. 4417 - 4432
Main Authors 尹大伟, 丁屹松, 汪锋, 江宁, 柳慧敏, 谭毅
Format Journal Article
LanguageChinese
Published 山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛 266590%河南理工大学能源科学与工程学院,河南焦作 454003 01.12.2023
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ISSN0253-9993
DOI10.13225/j.cnki.jccs.2023.0256

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Abstract TD82; 矿井关闭或废弃前,采空区遗留支撑煤柱受周边工作面采动、覆岩载荷等影响,产生了一定的损伤破坏;矿井关闭或废弃后,采空区一旦形成承压积水环境,将加剧煤柱支承性能劣化,可引发其破坏失稳,造成地表突然塌陷等灾害.为研究初始损伤和压力水浸对关闭或废弃矿井遗留支撑煤柱的耦合劣化作用,基于自主研发的煤岩压力水浸试验装置,进行了5组不同初始损伤的压力水浸煤样单轴压缩试验,结合XTDIC三维全场应变测量系统、扫描电子显微镜等系统,分析了煤样强度、变形破坏与能量演化等特征,从宏细观结构演化、矿物组分变化等方面揭示了煤样力学特性劣化机制.研究结果表明:①基于煤岩黏弹塑性变形理论,将循环加卸荷产生的耗散能细分为塑性损伤能与阻尼能,重新定义了煤岩循环加卸荷初始损伤量,计算获得5组煤样平均初始损伤量分别为0、0.071、0.114、0.205和0.309;②压力水浸煤样单轴抗压强度、弹性模量与初始损伤量呈负相关,而峰前塑性变形与初始损伤量呈正相关;随着初始损伤量增大,煤样缺陷处应力集中现象愈发显著,形成多个变形局部化带,其位移错动量变化率波动剧烈,且煤样破坏模式由拉伸破坏向拉-剪混合破坏转变,破碎程度增大;③初始损伤和压力水浸耦合作用下,煤样内部孔隙、微裂纹等萌生发育,颗粒间黏结力降低,内部结构由致密向疏松多孔转变,同时煤样宏观裂纹发育扩展,削弱了煤样实体承载结构,这是导致其力学特性劣化的根本原因,对应着煤样储能能力降低,峰后破坏动力显现强度减小.
AbstractList TD82; 矿井关闭或废弃前,采空区遗留支撑煤柱受周边工作面采动、覆岩载荷等影响,产生了一定的损伤破坏;矿井关闭或废弃后,采空区一旦形成承压积水环境,将加剧煤柱支承性能劣化,可引发其破坏失稳,造成地表突然塌陷等灾害.为研究初始损伤和压力水浸对关闭或废弃矿井遗留支撑煤柱的耦合劣化作用,基于自主研发的煤岩压力水浸试验装置,进行了5组不同初始损伤的压力水浸煤样单轴压缩试验,结合XTDIC三维全场应变测量系统、扫描电子显微镜等系统,分析了煤样强度、变形破坏与能量演化等特征,从宏细观结构演化、矿物组分变化等方面揭示了煤样力学特性劣化机制.研究结果表明:①基于煤岩黏弹塑性变形理论,将循环加卸荷产生的耗散能细分为塑性损伤能与阻尼能,重新定义了煤岩循环加卸荷初始损伤量,计算获得5组煤样平均初始损伤量分别为0、0.071、0.114、0.205和0.309;②压力水浸煤样单轴抗压强度、弹性模量与初始损伤量呈负相关,而峰前塑性变形与初始损伤量呈正相关;随着初始损伤量增大,煤样缺陷处应力集中现象愈发显著,形成多个变形局部化带,其位移错动量变化率波动剧烈,且煤样破坏模式由拉伸破坏向拉-剪混合破坏转变,破碎程度增大;③初始损伤和压力水浸耦合作用下,煤样内部孔隙、微裂纹等萌生发育,颗粒间黏结力降低,内部结构由致密向疏松多孔转变,同时煤样宏观裂纹发育扩展,削弱了煤样实体承载结构,这是导致其力学特性劣化的根本原因,对应着煤样储能能力降低,峰后破坏动力显现强度减小.
Abstract_FL Before the closure or abandonment of the mine,the remaining supporting coal pillars in the goaf were affected by surrounding working faces,overburden loads,and other factors,resulting in certain damage and destruction.After the closure or abandonment of the mine,once a pressurized water accumulation environment is formed in the goaf,it will ex-acerbate the deterioration of the support performance of the coal pillar,which can lead to its destruction and instability,causing sudden surface collapse and other disasters.In order to study the coupling deterioration of initial damage and pres-sure water immersion on the remaining supporting coal pillars in closed or abandoned mines,based on the self-developed coal rock pressure water immersion test device,five groups of uniaxial compression tests on the pressure water immersion coal samples with different initial damages were conducted.Combined with the XTDIC three-dimensional full field strain measurement system,scanning electron microscope and other systems,the characteristics of coal sample strength,deform-ation failure and energy evolution were analyzed.The changes in mineral composition and other aspects reveal the deteri-oration mechanism of mechanical properties of coal samples.The research results indicate that:① Based on the theory of viscoelastic plastic deformation of coal and rock,the dissipated energy generated by cyclic loading and unloading is sub-divided into plastic damage energy and damping energy.The initial damage amount of coal and rock cyclic loading and unloading is redefined,and the average initial damage amount of five sets of coal samples is calculated to be 0,0.071,0.114,0.205,and 0.309,respectively;② The uniaxial compressive strength and elastic modulus of pressure water im-mersed coal samples are negatively correlated with the initial damage amount,while the pre-peak plastic deformation is positively correlated with the initial damage amount.As the initial damage increases,the stress concentration phenomen-on at the defects of the coal sample becomes more significant,forming multiple deformation localization bands.The dis-placement change rate fluctuates sharply,and the failure mode of the coal sample changes from tensile failure to tensile shear mixed failure,resulting in an increase in the degree of fragmentation;③ Under the coupling effect of initial damage and pressure water immersion,the internal pores and microcracks of the coal sample initiate and develop,the bonding force between particles decreases,and the internal structure transits from dense to loose porous.At the same time,the mac-roscopic cracks of the coal sample develop and expand,weakening the physical bearing structure of the coal sample.This is the fundamental reason for the deterioration of its mechanical properties,corresponding to a decrease in the energy stor-age capacity of the coal sample and a decrease in the strength of the post-peak failure dynamic manifestation.The above research has important theoretical significance for understanding the long-term stability and failure instability of the sup-porting coal pillars left in closed or abandoned mines.
Author 柳慧敏
谭毅
尹大伟
汪锋
丁屹松
江宁
AuthorAffiliation 山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛 266590%河南理工大学能源科学与工程学院,河南焦作 454003
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Author_FL TAN Yi
YIN Dawei
JIANG Ning
DING Yisong
WANG Feng
LIU Huimin
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DocumentTitle_FL Experimental study on mechanical properties of coal soaked in pressurized water considering initial damage
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Issue 12
Keywords 破坏模式
destruction mode
damage mechanism
实体承载结构
solid load-bearing structure
能量演化
microscopic characteristics of fracture surface
劣化机制
初始损伤量
initial damage amount
energy evolution
破裂断口细观特征
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PublicationTitle 煤炭学报
PublicationTitle_FL Journal of China Coal Society
PublicationYear 2023
Publisher 山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛 266590%河南理工大学能源科学与工程学院,河南焦作 454003
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Snippet TD82; 矿井关闭或废弃前,采空区遗留支撑煤柱受周边工作面采动、覆岩载荷等影响,产生了一定的损伤破坏;矿井关闭或废弃后,采空区一旦形成承压积水环境,将加剧煤柱支承性能劣...
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Title 考虑初始损伤的压力水浸煤岩力学特性试验研究
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