高压磨料水射流切割破碎岩石的单轴力学特征研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (17) : 128-134.

论文

黄飞1,2,3，赵志旗2，李树清2，刘勇3，徐志任2，龙港2

作者信息 +

Uniaxial mechanical characteristics of rocks cut and crushed by high-pressure abrasive water jet

HUANG Fei1,2,3, ZHAO Zhiqi2, LI Shuqing2, LIU Yong3, XU Zhiren2, LONG Gang2

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文章历史 +

摘要

高压磨料水射流切割破碎后岩石的力学参数变化对于岩石的进一步破碎具有重要的影响。选取了砂岩、灰岩与花岗岩在水射流切割平台上开展了磨料射流冲击切割试验，对切割后的岩石进行CT扫描并重构岩石在不同冲击切割条件下的三维破碎形态，最后通过单轴压缩试验对比分析了岩石试件在磨料射流冲击切割前后的力学响应特征。研究结果表明：①在相同的射流参数条件下，岩石在磨料射流的移动切割下大多出现较为规整的缝槽形态，而定点冲击则出现孔洞破碎形态，前者比后者在岩石内部造成的损伤破碎程度更大；②磨料射流的冲击切割作用导致岩石试件在单轴压缩过程中出现折断型破碎形态的概率增加，且这种增加趋势随着切割长度的增加而愈加显著，但切割作用几乎不改变岩石试件的应力应变趋势；③岩石试件的单轴抗压强度与泊松比随切割长度与射流压力的增加呈现近似线性降低的趋势。本文研究结果可为高压磨料水射流煤层割缝卸压的工程应用提供一定的理论指导。

Abstract

Changes of mechanical parameters of rocks cut by the abrasive water jet have important influence on the subsequent breakage of rocks. Three selected rock samples, i.e., sandstone, limestone and granite, were firstly cut by the high-pressure abrasive water jet (AWJ) on the water jet cutting platform. Three dimensional breakage forms of rock samples were gained with the help of CT scanning technics. Then, the mechanical response of rock samples cut by AWJ was analyzed according to uniaxial compression tests. It’s revealed that the majority of rock samples moving-cut by AWJ take on the regular slot shape while most of rock samples impacted by AWJ take on breaking holes. The damage degree of former breaking pattern inside rock is much larger than that of latter. The cutting action of AWJ causes the uniaxial compression crushing form shift to broken type, and this tendency get obvious with the increase of cutting length. However, the stress-strain trend of rock sample keeps unchanged before and after AWJ impacting/cutting. What’s more, the uniaxial compressive strength as well as the Poisson's ratio of rock sample approx. linearly decreases with the increasing of jet pressure and cutting length. The results of this paper could provide some basic theory for the applications of AWJ slotting coal seam.

导出引用

黄飞1,2,3，赵志旗2，李树清2，刘勇3，徐志任2，龙港2. 高压磨料水射流切割破碎岩石的单轴力学特征研究[J]. 振动与冲击, 2023, 42(17): 128-134

HUANG Fei1,2,3, ZHAO Zhiqi2, LI Shuqing2, LIU Yong3, XU Zhiren2, LONG Gang2. Uniaxial mechanical characteristics of rocks cut and crushed by high-pressure abrasive water jet[J]. Journal of Vibration and Shock, 2023, 42(17): 128-134

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