CN112098221B - 一种矿井地下水库煤柱稳定性的相似模拟装置及实验方法 - Google Patents
一种矿井地下水库煤柱稳定性的相似模拟装置及实验方法 Download PDFInfo
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Abstract
一种矿井地下水库残留煤柱稳定性的相似模拟装置及实验方法,属于煤矿采空区建设地下水库过程中煤柱稳定性的实验室测试装置及方法。相似模拟装置主要包括加载系统、声发射系统、注水系统、流量采集系统以及应变测试系统。测试方法的主要步骤包括:运用无线应力传感器实测整个采区开采过程中煤柱的采动应力,根据实测应力设计煤柱试样应力路径;根据相似比建立煤矿采空区残留煤柱模型;在煤柱顶部施加现场采动应力至稳定状态;向腔体注水至要求水位,加入示踪剂,判断煤柱是否贯通;根据实验目的设置相应的净水时间、水流冲蚀速度等参数。在实验过程中记录煤柱声发射信号、煤柱变形量等参数,实验结束后CT扫描煤柱,观测内部裂隙发育情况。
Description
技术领域
本发明涉及一种矿井地下水库煤柱稳定性的相似模拟装置及实验方法,具体是一种利用煤矿采空区建设矿井地下水库过程中残留煤柱稳定性的试验装置及相应的实验方法。
背景技术
根据中国工程院研究,中国西部地区煤炭产量约占全国煤炭产量的80%。然而,中国西部地区生态环境脆弱,水资源严重短缺,仅占全国水资源的3.9%,高强度开采破坏了岩层结构,地表水和地下水渗入采空区,导致地表植被死亡、荒漠化加剧,脆弱的生态环境已经严重制约和影响了该区域经济和社会发展。因此,如何实现煤炭安全高效开采与地下水资源保护相协调,是当前中国西部矿区煤炭开采所面临的重大挑战。针对西部生态脆弱矿区煤炭开采与水资源保护的矛盾,利用煤矿采空区建立地下水库的保水开采理念,不仅可以实现对矿井水的储存与调用,还可以利用采空区冒落的矸石对矿井水进行过滤、沉淀、吸附、离子交换等自净化处理,解决了传统保水开采技术(充填开采、条带开采、限高开采等)存在的效率低、效益差、资源采出率低等问题。但在矿井地下水库建设过程中,工作面残留煤柱受到多次采动应力的影响,残留煤柱处于破断顶板侧向支承压力、上覆岩层压力及矿震冲击(由周边房式采空区大范围陷落或矿内采动厚硬顶板大面积垮落等引起)等动静载叠加的复杂应力环境中。此外,水的侵入也会对残留煤柱有很强的弱化作用,水岩作用一直是岩石力学研究的重点,水的侵入会降低煤岩的力学特性和改变裂纹扩展的形态。
综上可见,应力与水是作用于残留煤柱的两个关键物理场,两者相互影响,产生动静载与水浸耦合作用残留煤柱“损伤—渗流—累积损伤”渐进破坏效应,残留煤柱失稳将会引起垮落带储水空间和承载结构发生变化。但目前针对煤柱采动与水浸作用下的稳定性分析大多以实验室小尺寸煤样单轴加载为主,很难再现矿井地下水库残留煤柱真实情况下的采动水浸环境。因此,本发明针对上述问题建立了一套矿井地下水库残留煤柱模拟装置并给出了相应的模拟方法,对实现煤矿地下水库系统建设与长期安全运行具有重要意义。
发明内容
本发明的目的是要提供一种矿井地下水库煤柱稳定性的相似模拟装置及实验方法。
本发明的目的是这样实现的:具体步骤如下:
a、建设矿井地下水库残留煤柱稳定性相似模拟装置,包含加载系统、声发射系统、注水系统、流量采集系统以及应变测试系统。
b、加载系统采用伺服控制系统进行加载控制,分三个液压千斤顶,应力范围为0-100MPa,用于实现煤柱应力的加载;
c、声发射系统通过固定在煤柱试样的表面的声发射探头监测煤柱裂隙发育情况,声发射探头根据监测要求布置,并从声发射数据接口与声发射采集系统相连;
d、注水系统用来向腔体内注入矿井水以及含示踪剂矿井水,同时可以控制腔体内矿井水压,具体由液压泵通过注入接口向密封腔体内注水;
e、流量采集系统则采用流量计通过放水接口监测密封腔体内矿井水的流速,同时用储水槽来收集试验过后的矿井水,监测水质变化。;
f、应变监测系统用于监测煤柱试样的变形,根据具体监测要求,在煤柱试样模型表面布置相应的应变片,通过应变采集接口与应变采集系统相连;
g、相似模型装置还包括密封胶套、金属垫片、承压框架、密封腔体等装备。构建相似模拟装置后,进行煤柱稳定性相似模拟试验;
h、选择矿井地下水库建设采区,运用无线应力传感器实测整个采区开采过程中残留煤柱的采动应力,并根据实测应力设计煤柱试样应力加载路径;
i、根据相似比建立煤矿采空区残留煤柱模型,即根据残留煤柱的实际宽和高计算相应煤柱模型的宽和高;
j、根据煤柱模型具体尺寸在顶部及上部加设金属垫块,使得煤柱试样位于模拟装置中部;
k、对煤柱及金属垫块黏贴密封胶套,使得煤柱试样左右两个密封腔体仅能通过煤柱试样进行渗流;
l、布置相应的应变片和声发射探头,并利用声发射采集系统和应变采集系统进行应变和裂隙发育实测;
m、根据现场实测应力数据采用伺服控制系统进行煤柱加载直至稳定;
n、应力加载完毕后,向煤柱两侧密封腔体分别进行注水直至注到要求水压或者水位,水样直接选取至矿井水并在其中一测腔体加入示踪剂,用以判断煤柱试样是否贯通;当示踪剂从一侧渗入另一侧时,表明煤柱已经贯通;
o、根据实验目的设置净水时间以及矿井水渗流冲蚀速度,渗流速度则由液压泵调节由流量计监测;
p、在整个实验过程中记录煤柱试样声发射信号、变形量等数据;
q、实验结束后对煤柱试样进行CT扫描,观测内部裂隙发育情况。
附图说明
图1为现场采空区矿井水库示意图;图2是矿井地下水库残留煤柱稳定性的相似模拟装置示意图;图3是相似模拟装置正面示意图;图4是相似模拟装置侧面示意图;图5是现场实测煤柱应力演化规律。图中,1-残留煤柱;2-垮落带破碎岩体;3-无线应力传感器;4-矿井水;5-示踪剂矿井水;6-煤柱试样;7-金属垫块;8-密封胶套;9-声发射探头;10-声发射接口;11-声发射采集系统;12-应变片;13-应变采集接口;14-应变采集系统;15-注水接口;16-液压泵;17-放水接口;18-流量计;19-储水槽;20-液压千斤顶;21-伺服控制系统;22-加载压盘;23-承载框架;24-密封腔体
具体实施方式
下面结合附图对本发明的一个实施作进一步的描述:
a、建设矿井地下水库残留煤柱1稳定性相似模拟装置,包含加载系统、声发射系统、注水系统、流量采集系统以及应变测试系统。
b、加载系统采用伺服控制系统21进行加载控制,分三个液压千斤顶20,应力范围为0-100MPa,用于实现煤柱试样6应力的加载;
c、声发射系统通过固定在煤柱试样6的表面的声发射探头9监测煤柱试样6裂隙发育情况,声发射探头9根据监测要求布置,并从声发射数据接口10与声发射采集系统11相连;
d、注水系统用来向密封腔体24内注入矿井水4以及含示踪剂矿井水5,同时可以控制密封腔体24内矿井水压,具体由液压泵16通过注入接口15向密封腔体24内注水;
e、流量采集系统则采用流量计18通过放水接口17监测密封腔体24内矿井水4的流速,同时用储水槽19来收集试验过后的矿井水4,监测水质变化。;
f、应变监测系统用于监测煤柱试样6的变形,根据具体监测要求,在煤柱试样6模型表面布置相应的应变片12,通过应变采集接口13与应变采集系统14相连;
g、相似模型装置还包括密封胶套8、金属垫快7、承压框架23、密封腔体24等装备。构建相似模拟装置后,进行残留煤柱1稳定性相似模拟试验;
h、选择矿井地下水库建设采区,运用无线应力传感器3实测整个采区开采过程中残留煤柱1的采动应力(图5),并根据实测应力(图5)设计煤柱试样6应力加载路径;
i、根据相似比建立煤矿采空区残留煤柱1模型,即根据残留煤柱1的实际宽和高计算相应煤柱试样6的宽和高;
j、根据煤柱试样6具体尺寸在顶部及上部加设金属垫块7,使得煤柱试样6位于模拟装置中部;
k、对煤柱试样6及金属垫块7黏贴密封胶套8,使得煤柱试样6左右两个密封腔体24仅能通过煤柱试样6进行渗流;
l、布置相应的应变片12和声发射探头9,并利用声发射采集系统11和应变采集系统14进行应变和裂隙发育实测;
m、根据现场实测应力数据(图5)采用伺服控制系统21进行煤柱试样6加载直至稳定;
n、应力加载完毕后,向煤柱试样6两侧密封腔体24分别进行注水直至注到要求水压或者水位,水样直接选取至矿井水4并在其中一测腔体加入示踪剂5,用以判断煤柱试样6是否贯通;当示踪剂5从一侧渗入另一侧时,表明煤柱试样6裂隙已经贯通;
o、根据实验目的设置净水时间以及矿井水4渗流冲蚀速度,渗流速度则由液压泵16调节由流量计18监测;
p、在整个实验过程中记录煤柱试样6声发射信号、变形量等数据;
q、实验结束后对煤柱试样6进行CT扫描,观测内部裂隙发育情况。
Claims (1)
1.一种矿井地下水库残留煤柱稳定性的模拟实验方法,其特征是:
a、建设矿井地下水库残留煤柱稳定性相似模拟装置,包含加载系统、声发射系统、注水系统、流量采集系统以及应变测试系统;
b、加载系统采用伺服控制系统进行加载控制,分三个液压千斤顶,应力范围为0-100MPa,用于实现煤柱应力的加载;
c、声发射系统通过固定在煤柱试样的表面的声发射探头监测煤柱裂隙发育情况,声发射探头根据监测要求布置,并从声发射数据接口与声发射采集系统相连;
d、注水系统用来向腔体内注入矿井水以及含示踪剂矿井水,同时可以控制腔体内矿井水压,具体由液压泵通过注入接口向密封腔体内注水;
e、流量采集系统则采用流量计通过放水接口监测密封腔体内矿井水的流速,同时用储水槽来收集试验过后的矿井水,监测水质变化;
f、应变监测系统用于监测煤柱试样的变形,根据具体监测要求,在煤柱试样模型表面布置相应的应变片,通过应变采集接口与应变采集系统相连;
g、模型装置还包括密封胶套、金属垫片、承压框架、密封腔体装备;构建相似模拟装置后,进行煤柱稳定性相似模拟试验;
h、选择矿井地下水库建设采区,运用无线应力传感器实测整个采区开采过程中残留煤柱的采动应力,并根据实测应力设计煤柱试样应力加载路径;
i、根据相似比建立煤矿采空区残留煤柱模型,即根据残留煤柱的实际宽和高计算相应煤柱模型的宽和高;
j、根据煤柱模型具体尺寸在顶部及上部加设金属垫块,使得煤柱试样位于模拟装置中部;
k、对煤柱及金属垫块黏贴密封胶套,使得煤柱试样左右两个密封腔体仅能通过煤柱试样进行渗流;
l、布置相应的应变片和声发射探头,并利用声发射采集系统和应变采集系统进行应变和裂隙发育实测;
m、根据现场实测应力数据采用伺服控制系统进行煤柱加载直至稳定;
n、应力加载完毕后,向煤柱两侧密封腔体分别进行注水直至注到要求水压或者水位,水样直接选取至矿井水并在其中一测腔体加入示踪剂,用以判断煤柱试样是否贯通;当示踪剂从一侧渗入另一侧时,表明煤柱已经贯通;
o、根据实验目的设置净水时间以及矿井水渗流冲蚀速度,渗流速度则由液压泵调节由流量计监测;
p、在整个实验过程中记录煤柱试样声发射信号、变形量数据;
q、实验结束后对煤柱试样进行CT扫描,观测内部裂隙发育情况。
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