摘要
采用RMT-150B岩石力学伺服试验机对含预制裂缝的大理岩试样进行单轴压缩试验,分析了预制裂缝参数(裂缝倾角α=15°、30°、45°、60°、75°和裂缝位置l=25mm、37.5mm、50mm)对大理岩强度和破坏特性的影响。结果表明,应力-应变曲线随着预制裂缝倾角的增加,逐渐接近完整试样,受裂缝位置因素的影响相对较小;试样的峰值强度随预制裂缝倾角的增大,先小幅度增加,后发生减小,再剧烈增加,预制裂缝倾角很大程度地影响试样的破坏形式,并造成试样的强度差异;预制裂缝的扩展方向为偏离预制裂缝断面法线方向20°~90°范围;相比预制裂缝的位置因素,预制裂缝的倾角因素对岩石特性的影响更加显著。
In this paper, uniaxial compression experiment of marble specimens with prefabricated cracks was carried out by using RMT-150B rock mechanics servo test machine. The effect of prefabricated crack parameters (crack inclination angle α=15°, 30°, 45°, 60°, 75° and crack position l=25mm, 37.5mm, 50mm, respectively) on the strength and failure characteristics of marble were analyzed. Results show that with the increase of prefabricated crack inclination angle, the stress-strain curve gradually approaches the intact specimen, and is relatively less affected by the crack position factor. With the increase of prefabricated crack inclination angle, the peak strength of specimen increases by small amplitude first, then decreases, and finally increases sharply. The prefabricated crack inclination angle greatly affects the failure mode of specimen and causes the strength difference of specimen. The prefabricated crack affects the crack propagation direction, and the expansion direction is 20°~90° away from the normal direction of the prefabricated crack section. Compared with the positional factors of prefabricated cracks, the influence of the inclination factor of prefabricated cracks on rock properties is more significant.
作者
曹龙辉
张盛
焦振国
CAO Long-hui;ZHANG Sheng;JIAO Zhen-guo(College of Civil Engineering and Mechanics,Yanshan University,Qinhuangdao 066000,Hebei,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Collaborative Innovation Center of Coal Work Safety,Jiaozuo 454001,Henan,China;Baidong Coal Industry Co.Ltd.of Datong Coal Mine Group,Datong 037003,Shanxi,China)
出处
《实验力学》
CSCD
北大核心
2019年第5期800-808,共9页
Journal of Experimental Mechanics
基金
国家自然科学基金面上项目(No.51674101,51704098)
河南省重点实验室开放基金(S201605)资助
关键词
大理岩
预制裂缝
单轴压缩
倾角
峰值强度
marble
prefabricated crack
uniaxial compression
angle of inclination
peak strength
