Experimental study on influence of pre-cutting slot for breaking effect in rock splitting

被引：0
作者：
Liu Y. [1 ]
Hou Z. [1 ]
Bu Z. [1 ]
机构：
[1] School of Civil Engineering, Yantai University, Shandong, Yantai
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷
关键词：
crack propagation; directional control of fracture surface; laboratory test; pre-cutting slot; rock mechanics; rock splitting;
D O I：
10.13722/j.cnki.jrme.2022.0788
中图分类号：
学科分类号：
摘要：
An indoor splitting test was carried out to investigate the rock breaking effect which is influenced by the pre-cutting slot at borehole with an electro-hydraulic servo dynamic and static universal testing machine and some cube granite rock specimens. The directional control effect and the maximum splitting force at the moment of breaking were studied specifically in the test under different arrangement modes of pre-cutting slot,such as the setting or not,the direction(inclined slot along the diagonal direction and straight slot parallel to the upper surface boundary of specimen) and the length. Several experimental results were obtained as follows. (1) The pre-cutting slot can effectively control the initiation and propagation of crack and the extension direction of breaking surface,and can significantly inhibit the generation of secondary cracks. (2) Compared with the inclined slot,the straight slot can achieve better breaking directional control effect because it is less affected by the free surface. (3) The length of the pre-cutting slot possesses an obvious promotion effect in guiding the crack propagation and controlling the extension direction of the breaking surface,and this effect is positive correlation with the length of the slot. (4) The pre-cutting slot can reduce the maximum splitting force,and the maximum force shows a monotonically decreasing trend with the increase of the length of the slot. The above experimental conclusions will provide important practical guiding significance for improving rock breaking efficiency in non-blasting directional control rock splitting in the future. © 2023 Academia Sinica. All rights reserved.
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页码：4045 / 4053
页数：8
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