加载速率与瓦斯压力对煤体破坏微震信号特征影响研究  

Study on the influence of loading rate and gas pressure on the characteristics of microseismic signal of coal body damage

作　　者：陈浩[1] 贾宝新[1,2] 刘丰溥 周琳力 CHEN Hao;JIA Baoxin;LIU Fengpu;ZHOU Linli(School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China;Liaoning Key Laboratory of Mine Subsidence Disaster Prevention and Control,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000 [2]辽宁省矿山沉陷灾害防治重点实验室,辽宁阜新123000

出　　处：《地震工程与工程振动》2023年第3期239-248,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金面上项目(51774173);辽宁省“兴辽英才计划”项目(XLYC2007163);辽宁工程技术大学学科创新团队资助项目(LNTU20TD08);辽宁省“百千万人才工程”资助项目(2021921023)。

摘　　要：为研究加载速率与瓦斯压力对煤体破坏微震信号特征的影响,应用高频微震监测设备,开展不同瓦斯压力条件下煤体不同加载速率加载破坏全过程高频微震监测试验。由试验可得:随着加载速率的提高,煤体试件抗压强度增大、破坏时间减少、弹性模量与软化模量也随之增加,煤体冲击倾向性增大;与之相较,瓦斯压力的提高,煤体试件抗压强度降低、破坏时间增加、弹性模量与软化模量降低,冲击倾向性减小。HHT变换得到不同瓦斯压力和不同加载速率下煤体试样破坏微震信号边际谱。通过频谱分析得到:随着加载速率的提高,微震信号的中心频率和优势频率降低;随着瓦斯压力的提高,微震信号的中心频率和优势频率增大。煤岩破裂信号的频率与强度无关,与试样破坏方式和裂隙的发育有关。冲击地压和瓦斯突出发生时,均可以改变煤岩裂隙的发育形式,因此,煤岩破裂信号频率特征可以作为矿井动力灾害特征差异的研究。In order to study the characteristics of microseismic signals of coal failure,the self-developed high-frequency microseismic full-waveform real-time monitoring system was used to carry out the coal deformation and failure tests under load in the laboratory to monitor the deformation and failure mechanical behaviors and microseismic signals of coal samples under different gas pressures and loading rates.The experimental results show that with the increase of loading rate,the failure time of coal is shortened,the compressive strength is increased,the elastic modulus and softening modulus are also increased,and the impact liability of coal is increased.In contrast,with the increase of gas pressure,the failure time of coal increases,the compressive strength decreases,the elastic modulus and softening modulus decrease,and the impact liability decreases.The marginal spectrum of failure microseismic signals of media samples under different gas pressures and loading rates was obtained by HHT transformation.The frequency spectrum analysis shows that the center frequency and dominant frequency of microseismic signal decreases with the increase of loading rate.With the increase of gas pressure,the central frequency and dominant frequency of microseismic signal increase.The frequency of coal fracture signal is not related to the strength,but is related to the failure mode and the development of fracture.When rock burst and gas outburst occur,the development form of coal and rock fissure can be changed.Therefore,the frequency characteristics of coal and rock fracture signal can be used to study the difference of dynamic disaster characteristics of rock burst and coal and gas outburst.

关 键 词：动力灾害 微震信号差异 HHT变换 瓦斯压力 加载速率 

分 类 号：TD712[矿业工程—矿井通风与安全]