不同应力加载条件下自激脉冲水射流冲击煤岩的损伤演化和断裂特征

IF 3.5 3区 工程技术 Q3 ENERGY & FUELS Energy Science & Engineering Pub Date : 2024-07-31 DOI:10.1002/ese3.1844
Hongyu Ma, Wen Wan, Dongfang Xu, Pengtao Zhao, Jiaokun Wu, Yong Chen, Yao Wang
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引用次数: 0

摘要

本文基于平滑粒子流体力学-有限元法,建立了正弦速度柱塞挤压水的数值模型,以模拟自激脉冲水射流(SEPWJ)。采用 RHT 构成模型来描述煤岩受水射流冲击后的损伤和破坏。比较了自激脉冲水射流(SEPWJ)和连续水射流(CWJ)在有应力加载和无应力加载条件下破碎坑的形态演变和破岩效率的时效性。揭示了水射流冲击诱发煤岩内部损伤和应力的演变规律及破坏机理。并研究了不同应力加载大小对煤岩断裂特征的影响。结果表明,在无应力加载条件下,自激脉冲射流形成的破碎坑形态依次发生了半圆形、U 形、V 形和子弹形的变化。当施加一维(1D)和二维应力加载时,分别形成了沿应力加载方向具有层状主裂纹的浅而宽的破损凹坑和倒梯形碗状破损凹坑。随着一维应力的增加,破损凹坑的深度和宽度分别以二次抛物线函数的形式略微减小和线性增加。而随着二维应力的增加,破损凹坑的宽度和面积都呈指数缓慢下降趋势。与 CWJ 相比,SEPWJ 能诱发更高的应力,使煤岩更早出现初始破坏,破坏累积持续时间更短,破岩效果更好。表层和深层煤岩元素的破碎主要是由于压缩剪应力造成的。由于应力加载对喷射冲击的抑制作用,二维应力加载延迟了初始破坏的发生,延长了破坏累积持续时间。
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Damage evolution and fracture characteristics of coal rock impacted by self-excited pulse water jet under different stress loading conditions

In this paper, based on smoothed-particle hydrodynamics-finite element method, numerical models of plunger squeezing water at a sinusoidal velocity were established to simulate self-excited pulse water jet (SEPWJ). RHT constitutive model was adopted to describe the damage and failure of coal rock impacted by water jet. The morphological evolutions of broken pits and timeliness of rock-breaking efficiency of SEPWJ and continuous water jet (CWJ) under the conditions with and without stress loadings were obtained and compared. The evolution laws of damage and stress inner coal rock induced by jet impact, and the failure mechanism were revealed. And the influences of different stress loading magnitudes on the fracture characteristics of coal rock were investigated. The results show that the morphologies of broken pits formed by self-excited pulse jet undergo changes in a semi-circular, U-shaped, V-shaped, and bullet shaped in sequence under the stress-free loading condition. When applying one-dimensional (1D) and 2D stress loadings, the shallow but wide broken pits with laminar main cracks along the stress loading direction and the inverted trapezoidal bowl broken pits are formed, respectively. With the increase of 1D stress, the depth and width of broken pits slightly decrease as a quadratic parabolic function and linearly increase, respectively. And the broken pit width and area both show an exponential slow decreasing trends with the increasing 2D stress. SEPWJ can induce higher stresses to cause the earlier occurrence of initial damage and the shorter duration of damage accumulation to coal rock than CWJ, which leads to a better rock-breaking effect. The surface and deeper coal rock elements are broken mainly due to compressive shear stresses. The 2D stress loading delays the initial damage occurrence and prolongs the damage accumulation duration due to inhibitory effect of stress loading on jet impact.

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来源期刊
Energy Science & Engineering
Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality
CiteScore
6.80
自引率
7.90%
发文量
298
审稿时长
11 weeks
期刊介绍: Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.
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