An SHPB test study on wave propagation across rock masses with different contact area ratios of joint

被引：128
作者：
Li, J. C. [1 ]
Li, N. N. [2 ]
Li, H. B. [2 ]
Zhao, J. [3 ]
机构：
[1] Southeast Univ, Sch Civil Engn, Nanjing 210096, Jiangsu, Peoples R China
[2] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
[3] Monash Univ, Dept Civil Engn, Bldg 60, Clayton, Vic 3800, Australia
来源：
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING | 2017年 / 105卷
基金：
美国国家科学基金会;
关键词：
SHPB test; Wave propagation; Jointed rock mass; Joint matching coefficient; Dynamic behavior of rock joint; P-WAVES; TRANSMISSION; DEFORMATION; CLOSURE; ATTENUATION; FRACTURES; STRENGTH;
D O I：
10.1016/j.ijimpeng.2016.12.011
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The Split Hopkinson Pressure Bar (SHPB) apparatus was adopted to investigate the influence of joint contact area and spatial geometry of joint surface on the dynamic property of rock joint and wave propagation. The specimen was comprised of two rock cylinders. The top surfaces of the two cylinders contacted with each other, and their bottom surfaces contacted with the input and output bars of the SHPB apparatus, respectively. One top surface of one cylinder was sawn to shape a number of notches, while the other surfaces of the two cylinders were smooth and flat. The artificial rock joint was modeled as the contacted top surfaces of the two cylinders. The area ratio of contact between joint surfaces equals to the joint matching coefficient (JMC). The incident, transmitted and reflected waves were recorded from the strain gauges mounted on the input and output bars. Then, the transmission and reflection coefficients for strain wave propagation across the rock specimen were obtained. Based on the basic theory of SHPB tests, the stress on the specimen, the deformation of rock specimen and the stress-closure relation of joint were analyzed. The experimental results show that the JMC and the spatial geometry of joint surface affect not only the dynamic behavior of joint but also the stress wave propagation. (C) 2016 Elsevier Ltd. All rights reserved
引用
收藏
页码：109 / 116
页数：8
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