基于核磁共振的不同含水狀態砂巖動態損傷規律

褚夫蛟; 劉敦文; 陶明; 彭懷德

doi:10.13374/j.issn2095-9389.2018.02.003

基于核磁共振的不同含水狀態砂巖動態損傷規律

doi: 10.13374/j.issn2095-9389.2018.02.003

褚夫蛟^1,2, ,,
劉敦文²,
陶明²,
彭懷德²

1) 山東理工大學資源與環境工程學院, 淄博 255049
2) 中南大學資源與安全工程學院, 長沙 410083

基金項目:

國家自然科學基金資助項目（51404303）；山東省自然科學基金資助項目（ZR2016EL06）

詳細信息

中圖分類號: TU45
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出版歷程
- 收稿日期: 2017-02-08

Dynamic damage laws of sandstone under different water bearing conditions based on nuclear magnetic resonance

1) School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, China
2) School of Resources and Safety Engineering, Central South University, Changsha 410083, China

摘要

摘要: 為研究不同含水狀態巖石的動態損傷特性，制備干燥、半飽和、飽和3種不同含水狀態的砂巖試樣.采用分離式霍普金森壓桿（SHPB），以4種不同的低入射能對巖石進行損傷沖擊試驗.通過核磁共振測試實驗對巖石試樣進行孔隙掃描，獲取巖石孔隙的T₂譜曲線、孔隙度以及孔隙成像等數據.通過試驗發現：（1）沖擊能量的增加導致巖石的平均應變率和強度的增大；（2）不同含水狀態的巖石受到沖擊后，孔隙度與孔隙度變化率均有不同程度的增加；（3）與沖擊前相比，巖石的T₂譜曲線有明顯右移趨勢，同時出現譜峰增加的現象，而且沖擊能量越大，孔隙譜峰增加越明顯；（4）核磁共振成像顯示巖石孔隙數量和尺寸有明顯的增加，展現出巖石內部孔隙擴展和演化的過程.
- 含水狀態 /
- 動態損傷 /
- 沖擊試驗 /
- 核磁共振 /
- 孔隙度 /
- T₂譜曲線
Abstract: To study the dynamic damage characteristics of sandstone under different water bearing conditions, three different kinds of samples with different moisture states (dry, semi-saturated, and saturated) were prepared. The impact damage of the rock was tested using a split Hopkinson pressure bar (SHPB) with four values of low incident energy. The T₂ spectrum curves, porosity, and pore image of the samples were obtained by scanning the samples by nuclear magnetic resonance test. The results show the following:(1) an increase in the impact energy led to increased average strain rate and strength; (2) after impact, the porosity and porosity variation rate of every sample under different water bearing conditions increase with different amounts; (3) compared with the test before impact, T₂ spectrum curve has obvious right movement trend and large pore peaks increase. The greater the impact energy increase, more obvious the large pore peaks increased are; (4) nuclear magnetic resonance images show that the number and size of pores increase, which show the expansion and evolution of pores in the rocks.
- water bearing condition /
- dynamic damage /
- impact test /
- nuclear magnetic resonance /
- porosity /
- T₂ spectrum curves

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參考文獻(5)

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