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<p>Abrasive water jet rock-breaking technology holds broad application prospects in underground engineering construction and resource extraction. In deep underground engineering, the surrounding rock undergoes repeated dry–wet cycles due to the long-term influence of periodic groundwater-level fluctuations. To investigate the mechanism by which dry–wet cycling affects the cutting efficacy of abrasive water jets on green sandstone, this study conducted mechanical property testing and high-pressure abrasive water jet cutting experiments on green sandstone subjected to varying numbers of dry–wet cycles. Employing dynamic strain monitoring, CT three-dimensional reconstruction, and SEM microstructural analysis, a systematic investigation was conducted into the mechanical degradation, strain response, deformation characteristics, and evolution of cutting morphology in rock following dry–wet cycling. The results indicate that the dry–wet cycle leads to a significant reduction in the mechanical strength of the green sandstone, with the degradation process exhibiting a three-stage characteristic: waterweakening stage, stable weakening stage, and pronounced weakening stage. Compared with the dry state, the cutting width, volume, and average depth after 20 dry wet cycles increased by 20.63, 47.31, and 80.34%, respectively. Strain perpendicular to the cut direction is significantly greater than that parallel to it. The surface deformation field can be divided into three zones: the deformation concentration zone, the deformation transition zone, and the micro-deformation zone. Microscopically, with the increase in the number of cycles, the cutting surface roughness, delamination, and the formation of erosion pits increase significantly. This study quantifies the relationship between damage accumulation in green sandstone under dry–wet cycle and the cutting efficacy of abrasive water jets, elucidating multi-scale rock-breaking mechanisms. It provides crucial theoretical foundations for optimizing efficient, precision jet cutting parameters in water-rich formations.</p>

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Effect of Dry–Wet Cycling on the Abrasive Water Jet Cutting Performance of Green Sandstone

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Zhaolong Ge,
  • Zhuolin Shi,
  • Qinglin Deng,
  • Jianming Shangguan,
  • Zhi Yao,
  • Yuhuai Cui,
  • Houhan Pu

摘要

Abrasive water jet rock-breaking technology holds broad application prospects in underground engineering construction and resource extraction. In deep underground engineering, the surrounding rock undergoes repeated dry–wet cycles due to the long-term influence of periodic groundwater-level fluctuations. To investigate the mechanism by which dry–wet cycling affects the cutting efficacy of abrasive water jets on green sandstone, this study conducted mechanical property testing and high-pressure abrasive water jet cutting experiments on green sandstone subjected to varying numbers of dry–wet cycles. Employing dynamic strain monitoring, CT three-dimensional reconstruction, and SEM microstructural analysis, a systematic investigation was conducted into the mechanical degradation, strain response, deformation characteristics, and evolution of cutting morphology in rock following dry–wet cycling. The results indicate that the dry–wet cycle leads to a significant reduction in the mechanical strength of the green sandstone, with the degradation process exhibiting a three-stage characteristic: waterweakening stage, stable weakening stage, and pronounced weakening stage. Compared with the dry state, the cutting width, volume, and average depth after 20 dry wet cycles increased by 20.63, 47.31, and 80.34%, respectively. Strain perpendicular to the cut direction is significantly greater than that parallel to it. The surface deformation field can be divided into three zones: the deformation concentration zone, the deformation transition zone, and the micro-deformation zone. Microscopically, with the increase in the number of cycles, the cutting surface roughness, delamination, and the formation of erosion pits increase significantly. This study quantifies the relationship between damage accumulation in green sandstone under dry–wet cycle and the cutting efficacy of abrasive water jets, elucidating multi-scale rock-breaking mechanisms. It provides crucial theoretical foundations for optimizing efficient, precision jet cutting parameters in water-rich formations.