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Energy dissipation characteristics of high-temperature granites after water-cooling under different impact loadings

不同冲击荷载下高温-水冷却花岗岩能量耗散特征研究

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Abstract

Studying the energy dissipation characteristics of high-temperature rock after cooling with water during geothermal drilling construction is crucial to improving rock crushing efficiency. The energy dissipation characteristics of granite were investigated by conducting dynamic tests with a split Hopkinson pressure bar (SHPB) system under different impact loadings. The granite specimens were subjected to temperatures from 25 °C to 1000 °C. The micromorphology and pore distribution of granite were obtained by scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) tests. The porosity change trend could be divided into two stages at 400 °. The micropores and small pores accounted for over 75.0% before 400 °C The medium pore proportion increased rapidly when T≽400 °C. In addition, the dynamic peak stress and peak strain increased with incident energy, while the trend of the change in the dynamic elastic modulus was not apparent. The proportion of dissipated energy showed an upwards trend when the heating temperature varied from 25 °C to 800 °C, while the absorbed energy of granite heated to 1000 °C decreased. The energy utilization efficiency was the highest when the strain rate was between 100 s−1 and 120 s−1.

摘要

研究地热钻井施工中高温岩石冷却后的能量耗散特性, 对提高岩石破碎效率至关重要。通过对 分离式霍普金森压杆(SHPB)系统在不同冲击载荷下的动态试验, 研究了高温-水冷却花岗岩的能量耗 散特性。花岗岩的加热范围为25 ℃至1000 ℃。此外, 还通过电镜扫描(SEM)和压汞试验(MIP)获得了 该花岗岩的微观形貌和孔隙分布。以400 ℃为界, 孔隙分布变化趋势可分为两个阶段: 在400 ℃之前, 微孔和小孔占比超过75.00%;当T≥400 ℃时, 中孔占比迅速增加。此外, 动态峰值应力和峰值应变随 入射能量的增加而增加, 而动态弹性模量的变化趋势不明显。当加热温度从25 ℃增加到800 ℃时, 耗 散能占比呈上升趋势, 而加热到1000 ℃的花岗岩的吸收能量下降。当应变率在100 s−1−120 s−1之间时, 能量利用效率最高。

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering (China University of Mining and Technology), Xuzhou, 221116, China

    Dong-yang Wu  (武东阳), Li-yuan Yu  (蔚立元), Tao Zhang  (张涛), Hai-jian Su  (苏海健) & Ming-he Ju  (鞠明和)

  2. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact (Army Engineering University of PLA), Nanjing, 210007, China

    De-rong Wang  (王德荣)

  3. School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China

    Chun-mei Zheng  (郑春梅)

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  1. Dong-yang Wu  (武东阳)
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  2. Li-yuan Yu  (蔚立元)
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  3. Tao Zhang  (张涛)
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Correspondence to Li-yuan Yu  (蔚立元).

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Contributors

WU Dong-yang wrote the first draft of manuscript. YU Li-yuan reviewed the manuscript and provided the financial support. ZHANG Tao validated the proposed method with experiment. SU Hai-jian reviewed the manuscript and provided the financial support. JU Ming-he reviewed the manuscript and provided the financial support. WANG De-rong reviewed the manuscript. ZHENG Chun-mei provided the financial support.

Foundation item

Projects(52179118, 42077240, 52104101) supported by the National Natural Science Foundation of China; Project (KJQN201900727) supported by the Scientific and Technological Research Program of Chongqing Municipal Education Commission, China

Conflict of interest

WU Dong-yang, YU Li-yuan, ZHANG Tao, SU Hai-jian, JU Ming-he, WANG De-rong and ZHENG Chun-mei declare they have no conflict of interest.

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Wu, Dy., Yu, Ly., Zhang, T. et al. Energy dissipation characteristics of high-temperature granites after water-cooling under different impact loadings. J. Cent. South Univ. 30, 992–1005 (2023). https://doi.org/10.1007/s11771-023-5284-x

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