文献类型：期刊文献

英文题名：Stress Distribution and Dynamic Evolution of Coal Surface Under a Single Droplet of Discrete Water Jet

作者：Yuan, Man Zhao, Xun Jiang, Mingjun Liu, Yingke Wang, Fengchao Yang, Tengrui Yin, Lingxiao Wen, Xiaojiang

第一作者：Yuan, Man

通信作者：Liu, YK[1];Liu, YK[2]

机构：[1]China Univ Min & Technol, Minist Educ, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221116, Jiangsu, Peoples R China;[2]China Univ Min & Technol, Sch Safety Engn, 1 Univ Rd, Xuzhou 221116, Jiangsu, Peoples R China;[3]Guizhou Inst Technol, Inst Min Engn, Guiyang 550003, Guizhou, Peoples R China;[4]China Univ Min & Technol, Sch Low Carbon Energy & Power Engn, Xuzhou 221116, Jiangsu, Peoples R China

第一机构：China Univ Min & Technol, Minist Educ, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221116, Jiangsu, Peoples R China

通信机构：corresponding author), China Univ Min & Technol, Minist Educ, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221116, Jiangsu, Peoples R China;corresponding author), China Univ Min & Technol, Sch Safety Engn, 1 Univ Rd, Xuzhou 221116, Jiangsu, Peoples R China.

年份：2024

外文期刊名：ROCK MECHANICS AND ROCK ENGINEERING

收录：;EI(收录号：20243416903598);Scopus(收录号：2-s2.0-85201262570);WOS:【SCI-EXPANDED(收录号:WOS:001289935900001)】；

基金：This work was supported by the Foundation of Research Funds for the Central Universities (2020ZDPY0310), the Graduate Innovation Program of China University of Mining and Technology (2023WLKXJ148), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX23_2862).DAS:The data are available from the corresponding author on reasonable request.

语种：英文

外文关键词：Water jet; Droplet; Coal surface; Stress distribution; Dynamic evolution

摘要：The morphology of the water jet in the far field is a discrete flow consisting of multiple disorganized discrete single droplets. However, the stress distribution and dynamic evolution of the coal surface under the impact of a single droplet is still unclear, which makes it difficult to obtain the key factors affecting the coal stress. In this paper, a mathematical model for coal surface stress distribution and dynamic evolution under single droplet impact was established, the stress concentration characteristics and the key affecting factors of coal surface were studied, and the synergistic effects of these factors on the stress distribution and damage characteristics were explored. The results show that the impact velocity of the droplet is the main controlling factor in determining the coal surface's stress distribution and dynamic evolution. The principal stresses are concentrated by compressive stress in the center of the droplet-coal contact area, and the radial stress is concentrated by tensile stress in the edge of the contact area. The principal stresses have the same evolutionary trend with time and the stress attenuation decreases with increasing distance between the material point and the center of the contact area. The droplet's impact velocity and the Poisson's ratio of coal synergistically affect the stress distribution and damage on the coal surface by changing the value of the principal stresses and the proportionality between the principal stresses, respectively. The results lay a theoretical foundation for clarifying the parameter adjustment and the coal damage mechanism under discrete flow impact. A mathematical model for surface stress distribution and dynamic evolution of coal under single droplet impact is established. Stress concentration characteristics of coal surface under single droplet impact are revealed. The impact velocity of the droplet affects the stress distribution and damage on the coal surface by changing the value of the principal stresses. The Poisson's ratio of coal affects the stress distribution and damage on the coal surface by changing the proportionality between the principal stresses.