煤柱体应力松弛特性的试验研究
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摘要
为了研究高宽比对煤柱应力松弛现象随时间变化规律的影响,制作了高宽比不同的煤柱体试件,通过分级应变加载的单轴压力试验,对高宽比不同的煤柱进行了应力松弛试验研究。结果表明:应力松弛过程分为3个阶段:骤降阶段、缓慢下降阶段、稳定阶段。应变级别一定时,随着高宽比的增大,应力松弛现象持续的时间增长,初始应力和残余应力均变小,而应力松弛量和松弛比均变大;高宽比一定时,增大应变级别,应力松弛量随之增加,而应力松弛比却减小。此研究可为煤柱的安全性和延长使用寿命提供一定的试验依据。
In order to study the influence of the high aspect ratio on the stress relaxation phenomenon of coal pillar with time, we have made coal pillar specimen with different high aspect ratio, and carried out the stress relaxation test under graded loading and strain control. The results show that, the stress relaxation process is divided into three stages: the sudden drop stage, the slow decline stage and the stable stage. When the strain level is constant, with the increase of high aspect ratio, stress relaxation phenomenon of coal pillar increases constantly with time, the initial stress and the residual stress decreases, while the stress relaxation amount and relaxation ratio are increased. When the high aspect ratio is constant, the stress relaxation amount is increased with the increase of strain level, while the stress relaxation ratio decreased. This study can provide a certain test basis for the safety and extend service life of the coal pillar.
In order to study the influence of the high aspect ratio on the stress relaxation phenomenon of coal pillar with time, we have made coal pillar specimen with different high aspect ratio, and carried out the stress relaxation test under graded loading and strain control. The results show that, the stress relaxation process is divided into three stages: the sudden drop stage, the slow decline stage and the stable stage. When the strain level is constant, with the increase of high aspect ratio, stress relaxation phenomenon of coal pillar increases constantly with time, the initial stress and the residual stress decreases, while the stress relaxation amount and relaxation ratio are increased. When the high aspect ratio is constant, the stress relaxation amount is increased with the increase of strain level, while the stress relaxation ratio decreased. This study can provide a certain test basis for the safety and extend service life of the coal pillar.
引文
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[9]刘新颖.山区高速公路边坡稳定性分析及其流变影响研究[D].长沙:中南大学,2013.
[2]苏承东,陈晓祥,袁瑞甫.单轴压缩分级松弛作用下煤样变形与强度特征分析[J].岩石力学与工程学报,2014,33(6):1135-1141.
[3]沙猛猛,朱卫兵,徐敬民,等.常乐堡煤矿刀柱式开采煤柱稳定性研究[J].煤炭工程,2017,49(3):71-74,78.
[4]杨坪,宋立,薛守宝,等.土体应力松弛试验及模型研究进展[J].土工基础,2017,31(2):206-210.
[5]廖少明,门燕青,肖明清,等.软土盾构法隧道纵向应力松弛规律的实测分析[J].岩土工程学报,2017,39(5):795-803.
[6]杨永杰,段会强,刘传孝,等.考虑长期稳定性的深井采区上山保护煤柱合理留设[J].采矿与安全工程学报,2017,34(5):921-927,932.
[7]刘佳琦.阜新东梁矿非饱和砂岩蠕变试验及模型研究[D].阜新:辽宁工程技术大学,2015.
[8]汪明武,李健,徐新宇,等.非饱和石灰改良膨胀土应力松弛试验研究[J].工业建筑,2016,46(9):93-98.
[9]刘新颖.山区高速公路边坡稳定性分析及其流变影响研究[D].长沙:中南大学,2013.