Energy Evolution in Rockburst Model under Different Gradient Stress

被引:3
作者
Liu, Xiqi [1 ]
Wang, Gang [1 ,2 ]
Song, Leibo [3 ]
Bao, Chunyan [3 ]
Wang, Zhenhua [4 ]
Chang, Yan [5 ]
Wang, Dongxing [1 ]
机构
[1] Wuhan Univ, Sch Civil Engn, Key Lab Geotech & Struct Engn Safety Hubei Prov, Wuhan 430000, Peoples R China
[2] Wuhan Univ Technol, Hubei Key Lab Roadway Bridge & Struct Engn, Wuhan 430000, Peoples R China
[3] Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China
[4] East China Univ Technol, Sch Civil & Architecture Engn, Nanchang 330013, Peoples R China
[5] Pearl River Water Resources Res Inst, Guangzhou 510611, Peoples R China
基金
中国国家自然科学基金;
关键词
Rockburst; Stress gradient; Acoustic emission; Energy release; Rockburst prediction; FAILURE ANALYSIS; ROCK; SHEAR; HARD; COAL;
D O I
10.1007/s40999-023-00834-4
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
To study the effects of different stress gradient on rockburst hazards, a novel experimental technique was proposed and a series of tests under different stress gradient paths were conducted on specimens (400 mm x 600 mm x 1000 mm) by using a true-triaxial gradient and hydraulic-pneumatic combined test device. The damage phenomena, force characteristics and acoustic emission (AE) signals of the specimen during rockbursts were systematically analyzed. The experimental results indicated that different stress gradient distributions not only affect the failure mechanism of the specimen, but also affect the energy conversion characteristics. With the stress gradient increasing from 0 to 6, the index r decreasing from 0.93 to 0.37, and the power law growth characteristics of the energy acceleration tends to be obvious. The energy released after rockburst accounts for 31.1%, 41%, 77.7%, and 87.5% of the total energy, respectively, which is an important reason for the severe damage tendency of rockburst. Rockburst intensity can be judged according to the stress/strength ratio corresponding to the inflection point of the AE energy fitting curve under different stress gradients, which can be used as an important precursor of rockburst.
引用
收藏
页码:1495 / 1508
页数:14
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