不同类型煤体失稳破坏电荷感应试验研究
发布时间：2018-08-06 10:23
【摘要】：为得到不同类型煤体在压缩破坏过程中应力和电荷的变化规律,利用自主研制的电荷感应测试系统进行室内试验。试验分别对冲击型原煤试样、突出型原煤试样及型煤试样压缩破坏过程进行实时电荷监测。结果表明,不同类型的煤样在压缩过程中产生的应力变化曲线有明显的区别,冲击型煤样在加载过程中的应力-应变曲线在达到峰值应力前表现为较好的线性关系,峰后区的应力-应变曲线一般主要表现为近似竖直的直线。突出型煤样在加载过程中峰前区的应力曲线出现了多个峰值,在峰后区应力-应变曲线一般表现为上凹形的曲线。型煤试样的应力曲线峰前区有更为明显的压密阶段、线弹性阶段及弹塑性阶段,峰后区的应力-应变曲线一般表现为上凸的曲线。3种不同类型煤体压缩破裂时电荷感应信号峰值出现的位置及电荷感应信号的集中或分散程度也不同。冲击型煤样的电荷感应信号出现的位置相对比较集中,主要出现在峰值应力前后和试样完全失稳破坏阶段。突出型煤试样的电荷感应信号则比较分散,一般出现在应力出现峰值前后或应力急剧增加阶段。型煤试样的电荷感应信号一般出现在应力软化阶段,在峰值应力前阶段并没有收集到电荷感应信号。利用不同类型煤体在压缩破坏时的电荷感应信号不同,可以为矿山灾害的发生提供预报信息。
[Abstract]:In order to obtain the variation of the stress and charge of different types of coal in the process of compression and failure, the indoor test was carried out by the independent developed charge induction test system. The real time charge monitoring was carried out on the compression failure process of the impacted raw coal samples, the outstanding raw coal samples and the briquette samples. The results showed that different types of coal samples were in the test. The stress variation curve produced in the compression process is distinctly different. The stress strain curve of the briquette sample in the loading process shows a good linear relationship before the peak stress is reached, and the stress strain curve in the post peak area is generally mainly shown as a straight straight line. The stress strain curve in the post peak area usually shows a concave curve in the post peak area. The stress curve in the pre peak area of the briquette sample has more obvious compaction stage, linear elastic stage and elastoplastic stage, and the stress strain curve in the post peak area generally displays the charge sense when the.3 different types of coal are compressed and ruptured. The position of the peak value of the signal peak and the concentration or dispersion of the charge induction signal are different. The position of the charge induction signal of the briquette sample is relatively concentrated, which mainly occurs before and after the peak stress and the complete failure stage of the specimen. The charge stress signal of the sample of the outburst type coal is more dispersed and generally appears in the stress. The charge induction signal in the briquette specimen appears in the stage of stress softening, and the charge induction signal is not collected before the peak stress stage. The charge induction signal of different types of coal in the compression failure can provide the prediction information for the occurrence of mine disasters.
【作者单位】： 辽宁工程技术大学力学与工程学院;辽宁工程技术大学电气与控制工程学院;
【分类号】：TD315
本文编号：2167439
[Abstract]:In order to obtain the variation of the stress and charge of different types of coal in the process of compression and failure, the indoor test was carried out by the independent developed charge induction test system. The real time charge monitoring was carried out on the compression failure process of the impacted raw coal samples, the outstanding raw coal samples and the briquette samples. The results showed that different types of coal samples were in the test. The stress variation curve produced in the compression process is distinctly different. The stress strain curve of the briquette sample in the loading process shows a good linear relationship before the peak stress is reached, and the stress strain curve in the post peak area is generally mainly shown as a straight straight line. The stress strain curve in the post peak area usually shows a concave curve in the post peak area. The stress curve in the pre peak area of the briquette sample has more obvious compaction stage, linear elastic stage and elastoplastic stage, and the stress strain curve in the post peak area generally displays the charge sense when the.3 different types of coal are compressed and ruptured. The position of the peak value of the signal peak and the concentration or dispersion of the charge induction signal are different. The position of the charge induction signal of the briquette sample is relatively concentrated, which mainly occurs before and after the peak stress and the complete failure stage of the specimen. The charge stress signal of the sample of the outburst type coal is more dispersed and generally appears in the stress. The charge induction signal in the briquette specimen appears in the stage of stress softening, and the charge induction signal is not collected before the peak stress stage. The charge induction signal of different types of coal in the compression failure can provide the prediction information for the occurrence of mine disasters.
【作者单位】： 辽宁工程技术大学力学与工程学院;辽宁工程技术大学电气与控制工程学院;
【分类号】：TD315
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