Analysis of tunnel support design to withstand spalling induced by blasting

被引：52
|
作者：
Mitelman, Amichai [1 ]
Elmo, Davide [1 ]
机构：
[1] Univ British Columbia, NBK Inst Min Engn, Vancouver, BC V5Z 1M9, Canada
来源：
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2016年 / 51卷
关键词：
Support design; Spalling; Blasting; Numerical analysis; DAMAGE; SHOTCRETE; WAVE;
D O I：
10.1016/j.tust.2015.10.006
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This paper presents modeling of rock spalling induced by a dynamic pulse using the finite-discrete element method, for the purpose of tunnel support design to withstand blasting. 1D and 2D model results are compared to analytical spalling equations and field test findings. It was found that only the 2D models are suitable for support design. A distinction between heavy spalling and light rockfall is made based on an estimation of the ratio of the peak stress of the arriving wave to the rock tensile strength. Accordingly, different design approaches are suggested: for heavy spalling a low impedance isolating layer between the tunnel liner and surrounding rock is recommended. For light rockfall, a simplified static FEM analysis procedure is presented. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：354 / 361
页数：8
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