单向扰动加载触发煤体冲击破坏特性试验研究
TD324; 运用MTS-C64.106型压力机开展纯煤试件的单轴动静组合加载试验.结合PIC-2声发射卡和高速摄像机的监测结果,分析了单向扰动加载下煤体的力学、冲击性能、声发射特征、动态破坏特征、碎片分形特征.结果表明,扰动加载应变率增大,煤体强度呈对数增加;冲击性能增强;扰动能量输入速率、声发射振铃计数、撞击数呈现“缓增—急增—突增”的转变,试件破裂形式经历“剪切破裂—竖向劈裂—爆裂”的转变;碎片质量分维与动载应变率呈二次方关系,存在动载应变率极值使试件破坏程度达到最大,试验显示的应变率极值为2.8×10-3 s-1....
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| Published in | 煤炭学报 Vol. 43; no. 10; pp. 2741 - 2749 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
内蒙古科技大学矿业研究院,内蒙古包头014010%辽宁工程技术大学矿业学院,辽宁阜新,123000
01.10.2018
辽宁工程技术大学矿业学院,辽宁阜新123000 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-9993 |
| DOI | 10.13225/j.cnki.jccs.2018.0111 |
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| Abstract | TD324; 运用MTS-C64.106型压力机开展纯煤试件的单轴动静组合加载试验.结合PIC-2声发射卡和高速摄像机的监测结果,分析了单向扰动加载下煤体的力学、冲击性能、声发射特征、动态破坏特征、碎片分形特征.结果表明,扰动加载应变率增大,煤体强度呈对数增加;冲击性能增强;扰动能量输入速率、声发射振铃计数、撞击数呈现“缓增—急增—突增”的转变,试件破裂形式经历“剪切破裂—竖向劈裂—爆裂”的转变;碎片质量分维与动载应变率呈二次方关系,存在动载应变率极值使试件破坏程度达到最大,试验显示的应变率极值为2.8×10-3 s-1. |
|---|---|
| AbstractList | TD324; 运用MTS-C64.106型压力机开展纯煤试件的单轴动静组合加载试验.结合PIC-2声发射卡和高速摄像机的监测结果,分析了单向扰动加载下煤体的力学、冲击性能、声发射特征、动态破坏特征、碎片分形特征.结果表明,扰动加载应变率增大,煤体强度呈对数增加;冲击性能增强;扰动能量输入速率、声发射振铃计数、撞击数呈现“缓增—急增—突增”的转变,试件破裂形式经历“剪切破裂—竖向劈裂—爆裂”的转变;碎片质量分维与动载应变率呈二次方关系,存在动载应变率极值使试件破坏程度达到最大,试验显示的应变率极值为2.8×10-3 s-1. |
| Author | 宋卫华 吕鹏飞 陈学华 |
| AuthorAffiliation | 辽宁工程技术大学矿业学院,辽宁阜新123000;内蒙古科技大学矿业研究院,内蒙古包头014010%辽宁工程技术大学矿业学院,辽宁阜新,123000 |
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| Author_FL | CHEN Xuehua L(U) Pengfei SONG Weihua |
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| DocumentTitle_FL | Experimental study on the shock failure feature of coal triggered by uniaxial dynamic loading |
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| Keywords | 碎片分维 声发射 冲击地压 扰动加载 动态破坏 |
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| Title | 单向扰动加载触发煤体冲击破坏特性试验研究 |
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