doi:10.16186/j.cnki.1673-9787.2020.3.18

Received:2019/07/09

Revised:2019/08/19

Published:2020/05/15

Experimental study on the characteristics of wave velocity field evolution insiltstone fracture process

WANG Kexue1,2, ZHANG Yanbo1,2, YAO Xulong1,2, LIANG Peng1,2, LIU Xiangxin1,2

1.College of Mining Engineering， North China University of Science and Technology， Tangshan 063210 ， Hebei， China；2.Hebei Key Laboratory of Mining Industry Development with Safe Technology Priority， North China University of Science and Technology， Tangshan  063210 ， Hebei， China

Abstract:In order to study the evolution characteristics of wave velocity field， the siltstone step loading experiment was carried out. The phase and regional evolution characteristics of wave velocity field during rock fracture were studied. The results showed that the wave velocity imaging technology had a good effect on rock flaw detection， the low wave velocity zone coincided with the crack location， and the high wave velocity zone coincided with the complete bedrock area. Along with the development of cracks， the average wave velocity value and structural similarity of wave velocity field continued to decrease， and the difference of damage degree increased. Based on K-means method， rock regions were divided into three classes ： lossless domain I ， weak domain Ⅱ and damage domain Ⅲ.The evolution characteristics of region reflected the heterogeneity of rock. Computation by entropy weight method， the influence of three types of zones on rock damage degree was ： damage domain Ⅲ ＞ lossless domain I＞ weak domain Ⅱ .

Key words:siltstone;rock mechanics;acoustic emission;velocity field;wave velocity imaging technologywave velocity field evolution characteristic

粉砂岩破裂过程中波速场演化特征试验研究_王科学.pdf