Effects of water intrusion and loading rate on mechanical properties of and crack propagation in coal-rock combinations

被引:59
作者
Chen Tian [1 ]
Yao Qiang-ling [1 ]
Wei Fei [1 ]
Chong Zhao-hui [1 ]
Zhou Jian [1 ]
Wang Chang-bin [1 ]
Li Jing [1 ]
机构
[1] China Univ Min & Technol, Minist Educ China, Key Lab Deep Coal Resource Min, Sch Mines, Xuzhou 221116, Peoples R China
基金
中国国家自然科学基金;
关键词
water intrusion; loading rate; mechanical properties; coal-rock combination; crack propagation; stress threshold; ACOUSTIC-EMISSION; STRENGTH; BEHAVIOR; SATURATION; SIZE; MASS; THRESHOLDS; INITIATION; EVOLUTION; PRESSURE;
D O I
10.1007/s11771-017-3444-6
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Tackling the problems of underground water storage in collieries in arid regions requires knowledge of the effect of water intrusion and loading rate on the mechanical properties of and crack development in coal-rock combinations. Fifty-four coal-rock combinations were prepared and split equally into groups containing different moisture contents (dry, natural moisture and saturated) to conduct acoustic emission testing under uniaxial compression with loading rates ranging from 0.1 mm/min to 0.6 mm/min. The results show that the peak stress and strength-softening modulus, elastic modulus, strain-softening modulus, and post-peak modulus partly decrease with increasing moisture content and loading rate. In contrast, peak strain increases with increasing moisture content and fluctuates with rising loading rate. More significantly, the relationship between stiffness and stress, combined with accumulated counts of acoustic emission, can be used to precisely predict all phases of crack propagation. This is helpful in studying the impact of moisture content and loading rate on crack propagation and accurately calculating mechanical properties. We also determined that the stress thresholds of crack closure, crack initiation, and crack damage do not vary with changes of moisture content and loading rate, constituting 15.22%, 32.20%, and 80.98% of peak stress, respectively. These outcomes assist in developing approaches to water storage in coal mines, determining the necessary width of waterproof coal-rock pillars, and methods of supporting water-enriched roadways, while also advances understanding the mechanical properties of coal-rock combinations and laws of crack propagation.
引用
收藏
页码:423 / 431
页数:9
相关论文
共 50 条
[41]   Research on Dynamic Mechanical Properties and Numerical Simulation of Broken Coal-Rock Grouting Consolidation Bodies [J].
Huo, Jiaxin ;
Zhu, Changxing ;
Chen, Xinming ;
Guo, Jiaqi ;
Jiao, Huazhe ;
Zhang, Liyou ;
Xu, Yu ;
Wang, Mingzhi ;
Jin, Xiangfei .
RESULTS IN ENGINEERING, 2025, 26
[42]   Experimental study on mechanical properties and failure behaviour of the pre-cracked coal-rock combination [J].
Liu, Jiangwei ;
Wu, Na ;
Si, Guangyao ;
Zhao, Mingxin .
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT, 2021, 80 (03) :2307-2321
[43]   Mechanical Properties and Damage Characteristics of Coal-Rock Combination with Different Dip Angles [J].
Zhi-Guo Xia ;
Shuai Liu ;
Zhuang Bian ;
Jinhu Song ;
Fan Feng ;
Ning Jiang .
KSCE Journal of Civil Engineering, 2021, 25 :1687-1699
[44]   Characterization of Tensile Crack Propagation and Energy Evolution during the Failure of Coal-Rock Samples Containing Holes [J].
Jing, Chen ;
Zhang, Lei .
SUSTAINABILITY, 2022, 14 (21)
[45]   Crack propagation and dynamic properties of coal under SHPB impact loading: Experimental investigation and numerical simulation [J].
Ai, Dihao ;
Zhao, Yuechao ;
Wang, Qifei ;
Li, Chengwu .
THEORETICAL AND APPLIED FRACTURE MECHANICS, 2020, 105
[46]   Effects of water on rock fracture properties: Studies of mode I fracture toughness, crack propagation velocity, and consumed energy in calcite-cemented sandstone [J].
Maruvanchery, Varun ;
Kim, Eunhye .
GEOMECHANICS AND ENGINEERING, 2019, 17 (01) :57-67
[47]   Mechanical behaviors and failure characteristics of coal-rock combination under quasi-static and dynamic disturbance loading: a case based on a new equipment [J].
Jing, Suolin ;
Wen, Zhijie ;
Jiang, Yujing ;
Wen, Jinhao ;
Du, Wanjun .
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES, 2024, 10 (01)
[48]   Numerical Simulation Study on Mechanical and Acoustic Emission Characteristics of Coal-Rock Combined Body Subjected to Cyclic Disturbing Loading [J].
Duan, Huiqiang ;
Xiong, Si ;
Yu, Weibo .
GEOTECHNICAL AND GEOLOGICAL ENGINEERING, 2023, 41 (02) :783-802
[49]   Mechanical properties and crack propagation characteristics of mudstone under different loading frequencies [J].
Liang, Yunpei ;
Yang, Yu ;
Xin, Guangyao ;
Zou, Quanle ;
Ran, Qican ;
Qin, Dengke .
ENGINEERING FRACTURE MECHANICS, 2025, 316
[50]   Experimental Study on Mechanical Properties and Energy Evolution Law of Coal-Rock Composite Structure under Different Interface Connection Modes [J].
Tian, Chenglin ;
Sun, Haitao ;
Dai, Linchao ;
Li, Rifu ;
Wang, Bo ;
Cao, Jie ;
Wang, Jun ;
Hu, Qianting .
GEOFLUIDS, 2022, 2022