不同类型煤体失稳破坏电荷感应试验研究  

Experimental study over the different types of the destructive damage to the coal by the charge induction instability

作　　者：陈广阳[1] 潘一山[1] 罗浩[1] 杨月[1] 邱兆云[1] 杨桢[2] CHEN Guang-yang PAN Yi-shan LUO Hao YANG Yue QIU Zhao-yun YANG Zhen(School of Mechanics and Engineering, Liaoning Teehanical U- niversity, Fuxin 123000, Liaoning, China School of Electrical and Control Engineering, 1Liaoning Technical University, Huludao 125105, Liaoning, China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学电气与控制工程学院,辽宁葫芦岛125105

出　　处：《安全与环境学报》2016年第6期65-69,共5页Journal of Safety and Environment

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。The paper is to introduce its experimental study over the different types of the destructive damage to the coal by the compression-induced instability in hoping to disclose the changing regularity of the stress and strain of the different types of coal in the process of being heavily loaded compression. For this purpose, we have conducted experiments by using a kind of self-developed charge-induced instrument in the laboratory condition. At the same time, we have also conducted real-time charge monitoring tests for the compression failure process of the different raw coal samples under the heavy load, such as for the extruding raw coal samples and the briquette coal samples. The results of our experiments have thus shown that the stress curves of different coal samples tend to be noticeably different due to the compression load. What is more, it has been found that the impacted raw coal samples tend to reveal a kind of obviously different linear correlation till getting to its peak intensity. For example, the stress-strain curves can, on the general term, be represented in an approximately vertical straight line until its getting to the peak intensity in the process of compression failure. Nevertheless, there has already occurred a lot of peak values in the process of compression failure before they were getting to the peak intensity,though such curves were in generally assumed concave form when it is getting over its peak intensity. The stress curves of briquette samples present more obvious compression phase; linear elastic phase and elastic-plastic phase before the peak intensity. In such a situation, the charge induction signals are likely to be different on the condition when the three different kinds of coal are being compressed in a mixed way, with the points of the charge induction signal peaks due to the different degrees of concentration or distribution. Furthermore, since the locations of the impact of the charge induction signals from the coal samples are supposed to be relatively concentrated, the pe

关 键 词：安全工程 煤体 压裂 应力 电荷感应信号 

分 类 号：X45[环境科学与工程—灾害防治]