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ID:52170117
大小:2.40 MB
页数:6页
时间:2020-03-23
《三轴条件下煤体受压破裂电荷感应信号试验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofEngineeringGeology工程地质学报1004-9665/2015/23(5)092406DOI:10.13544/j.cnki.jeg.2015.05.014三轴条件下煤体受压破裂电荷感应信号试验研究郑文红潘一山李忠华罗浩史鹏翔(辽宁工程技术大学研究生学院阜新123000)摘要为研究煤体破裂程度与其释放电荷之间的联系以提高矿山动力灾害预测准确率,利用自主研制的电荷传感器对某矿原煤试件在三轴情况下进行电荷感应试验,分析相邻侧面不同破裂程度下煤体电荷感应信号的变化特征,将信号进
2、行快速傅里叶变换处理,在频域内研究不同孔隙瓦斯压力条件下电荷感应信号的变化规律,在此基础上对电荷累积量与声发射振铃总计数、总能量进行了对比分析。试验结果表明:同一煤体相邻两表面破裂程度越严重,其电荷感应信号越丰富;在围压不变情况下,随着孔隙压力的增大,煤体变形破裂过程中电荷感应信号频率的最大幅值波峰有逐渐向低频方向移动的趋势,煤体破裂电荷感应信号频率波动低于200Hz,幅值最大点频率在50Hz以内;电荷累积量曲线在煤体应力达到峰值后,表现出跳跃式增长趋势,但电荷感应信号的量级相对较小。关键词煤体受载裂隙孔隙压
3、力频率电荷感应中图分类号:TU45文献标识码:AEXPERIMENTALSTUDYOFCHARACTERISTICSABOUTCOALCHARGEINDUCTIONSIGNALUNDERTRIAXIALSTRESSCONDITIONZHENGWenhongPANYishanLIZhonghuaLUOHaoSHIPengxiang(SchoolofMechanics&Engineering,LiaoningTechnicalUniversity,Fuxin123000)AbstractThispaperlook
4、sforthelinksbetweenthecoalfracturedegreeandtheelectricityreleasedbytherawcoalsampletoimprovetheforecastingaccuracyofminedynamicdisaster.Theselfdevelopedchargesensorisusedtoconductchargeinductiontestwiththerawcoalsampleundertriaxialcompression.Itanalyzesthe
5、chargeinductionsignalvariationcharacteristicsofcoalwithdifferentfracturedegreesinadjacentsides.UsingFFTmethod,thespectrumofthechargeinducedsignalisprocessedtostudythechangerulesofthespectrumcausedbydifferentgasporepressuresinfrequencydomain.Thechargeaccumu
6、lationquantityisanalyzedcomparingwiththecumulativeringingcountsandthetotalacousticemissionenergyonthisbasis.Theresearchresultsshowthatthemoreseriousthecoalfracturedegreeis,thechargeinductionsignalismoreabundant.Astheporepressureincreases,thelargestpeakofthe
7、chargeinductionsignalfrequencyamplitudemovestolowfrequenciesunderthefixedconfiningpressure.Thefrequencyofthechargeinductionsignalisgenerallyin200Hzbelow.Thefrequencyofthelargeamplitudeappearslessthan50Hzunderthetriaxialcompressions.Thechargeaccumulationquan
8、tityshowsgreaterjumpgrowthtrend.Thecumulativeamountofthechargeinductionsignalamplitudeissmallerincomparison收稿日期:2014-08-02;收到修改稿日期:2014-12-05.基金项目:国家重点基础研究发展计划“973”项目(2010CB226803),国家自然科学基金面上项目(111721
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