Study on the mechanism of zonal disintegration around an excavation

被引：64
|
作者：
Zhu, Zheming [1 ]
Wang, Chao [1 ]
Kang, Jiming [1 ]
Li, Yuanxin [1 ]
Wang, Meng [1 ]
机构：
[1] Sichuan Univ, Sch Architecture & Environm, Key Lab Minst Educ Energy Engn Safety & Disaster, Chengdu 610065, Peoples R China
来源：
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES | 2014年 / 67卷
基金：
中国国家自然科学基金;
关键词：
Zonal disintegration; Defects; P-wave; Cracked zone; UNDERGROUND WORKINGS; FRACTURE; ROCKS; PROPAGATION; DAMAGE;
D O I：
10.1016/j.ijrmms.2013.12.017
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Zonal disintegration is a curious phenomenon and has received considerable attention recently. Using traditional static mechanics cannot well explain the phenomenon of the alternately distributed cracked zones. In this paper, the process of a slowly unloading P-wave reflecting from a free surface has been investigated and the result shows that as a slowly unloading P-wave encounters a free surface, it could cause the phenomenon of zonal disintegration. In order to confirm this result, two numerical models of detected rock around an excavation under the action of a slowly unloading P-wave are established. The slowly unloading P-wave is induced by a steel plate impacting the target rock with a proper speed, and their interaction lasts for a long time. The simulation results show that if the strength of slowly unloading P-waves is in a certain range, the phenomenon of zonal disintegration could be observed, and if the incident wave is not a slowly unloading P-wave, such as a rectangle wave, the phenomenon of zonal disintegration will not occur. (C) 2014 Elsevier Ltd. All rights reserved
引用
收藏
页码：88 / 95
页数：8
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