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基于NSCB方法的凍結紅砂巖動態斷裂特性試驗

方士正 楊仁樹 李煒煜 李永亮 楊陽

方士正, 楊仁樹, 李煒煜, 李永亮, 楊陽. 基于NSCB方法的凍結紅砂巖動態斷裂特性試驗[J]. 工程科學學報, 2023, 45(10): 1704-1715. doi: 10.13374/j.issn2095-9389.2022.08.15.005
引用本文: 方士正, 楊仁樹, 李煒煜, 李永亮, 楊陽. 基于NSCB方法的凍結紅砂巖動態斷裂特性試驗[J]. 工程科學學報, 2023, 45(10): 1704-1715. doi: 10.13374/j.issn2095-9389.2022.08.15.005
FANG Shizheng, YANG Renshu, LI Weiyu, LI Yongliang, YANG Yang. Investigation of dynamic fracture characteristics of frozen red sandstone using notched semi-circular bend method[J]. Chinese Journal of Engineering, 2023, 45(10): 1704-1715. doi: 10.13374/j.issn2095-9389.2022.08.15.005
Citation: FANG Shizheng, YANG Renshu, LI Weiyu, LI Yongliang, YANG Yang. Investigation of dynamic fracture characteristics of frozen red sandstone using notched semi-circular bend method[J]. Chinese Journal of Engineering, 2023, 45(10): 1704-1715. doi: 10.13374/j.issn2095-9389.2022.08.15.005

基于NSCB方法的凍結紅砂巖動態斷裂特性試驗

doi: 10.13374/j.issn2095-9389.2022.08.15.005
基金項目: 國家自然科學基金重點資助項目(51934001)
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    E-mail: wylcumtb@163.com

  • 中圖分類號: TD313

Investigation of dynamic fracture characteristics of frozen red sandstone using notched semi-circular bend method

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  • 摘要: 采用紅砂巖制作中心直裂紋半圓盤彎曲試樣(Notched semi-circular bend, NSCB),設置不同的負溫溫度對巖石試樣預處理,隨后利用改進后的分離式霍普金森桿(SHPB)實驗系統開展動態試驗。結果表明:巖石的斷裂韌度存在明顯的加載率效應,斷裂韌度試驗值隨加載率的增加近似呈指數型增大;當加載率一定時,巖石斷裂韌度由常溫進入負溫后先緩慢后快速增加,在–20 ℃時達到最大值,隨著溫度進一步降低,巖石斷裂韌度快速減小。進一步對巖石破裂過程分析發現,不同溫度下巖石的斷裂過程基本一致,且裂紋擴展速度受溫度影響較小。基于巖石斷面的掃描電子顯微鏡結果分析巖石斷裂模式為:負溫下紅砂巖的斷裂以沿晶破裂和膠結物的撕裂為主,伴有少量的穿晶破裂現象,同時當溫度降低至–25 ℃時,巖石內部微裂隙數量明顯增多,說明負溫對巖石具有劣化作用。最后探討了溫度對巖石內部結構的影響機制,對分析巖石斷裂特性的低溫效應具有一定參考意義。

     

  • 圖  1  試樣尺寸示意圖

    Figure  1.  Dimension of samples

    圖  2  部分試樣照片

    Figure  2.  Photo of some specimens

    圖  3  改進后的霍普金森桿示意圖

    Figure  3.  Schematic of the improved SHPB system

    圖  4  典型的動態平衡曲線

    Figure  4.  Typical dynamic stress balance curve

    圖  5  加載率確定方法

    Figure  5.  Determination method of loading rate

    圖  6  ?15 ℃時巖石應力強度因子時程曲線

    Figure  6.  History curves of rock fracture stress intensity factor at ?15 ℃

    圖  7  不同溫度下巖石的加載率及動態斷裂韌度

    Figure  7.  Loading rate and dynamic fracture toughness of rock at different temperatures

    圖  8  動態斷裂韌度隨溫度的變化趨勢. (a) 三維擬合圖;(b) 斷面提取曲線;(c) 實測數據

    Figure  8.  Trends of dynamic fracture toughness with temperature: (a) 3D fitting surface; (b) sectional maps extracted from fitting surface; (c) measured curves

    圖  9  不同溫度下巖石試樣的漸進破裂過程

    Figure  9.  Dynamic failure processes of NSCB specimen at different temperature

    圖  10  斷裂應力強度因子時程曲線階段劃分

    Figure  10.  Division of stress intensity factor history curve

    圖  11  典型試樣裂紋擴展長度和速度

    Figure  11.  Crack length and crack propagation velocity of the typical specimen

    圖  12  不同溫度下巖石裂紋擴展速度

    Figure  12.  Rock crack propagation velocity at different temperature

    圖  13  典型試樣測試后破壞形態. (a) 25 ℃;(b) –5 ℃;(c) –10 ℃;(d) –15 ℃;(e) –20 ℃;(f) –25 ℃

    Figure  13.  Typical tested NSCB specimens: (a) 25 ℃; (b) –5 ℃; (c) –10 ℃; (d) –15 ℃; (e) –20 ℃; (f) –25 ℃

    圖  14  常溫時典型破壞試樣的SEM圖. (a)裂紋擴展方向;(b)少量穿晶破壞;(c)顆粒剝離

    Figure  14.  SEM images of the typical failure sample at room temperature (The arrow indicates the direction of crack propagation): (a) crack extension direction; (b) small amount of TG damage; (c) particle peeling

    圖  15  低倍率下典型破壞試樣的SEM圖. (a) –5 ℃; (b) –10 ℃; (c) –15 ℃; (d) –20 ℃; (e) –25 ℃

    Figure  15.  SEM images of typical failure specimens at low magnification: (a) –5 ℃; (b) –10 ℃; (c) –15 ℃; (d) –20 ℃; (e) –25 ℃

    圖  16  高倍率下典型破壞試樣的SEM圖. (a) –5 ℃; (b) –10 ℃; (c) –15 ℃; (d) –20 ℃; (e) –25 ℃

    Figure  16.  SEM images of typical failure specimens at high magnification: (a) –5 ℃; (b) –10 ℃; (c) –15 ℃; (d) –20 ℃; (e) –25 ℃

    圖  17  基于孔隙連通性的孔隙分類[49]

    Figure  17.  Pore space classification in accordance with connectivity

    圖  18  端閉孔內凍脹力導致巖石破壞示意圖

    Figure  18.  Schematic of rock damage due to frost heaving pressure at the end closure hole

    表  1  加載率與動態斷裂韌度擬合曲線參數

    Table  1.   Loading rate and dynamic fracture toughness fitting curve parameters

    Temperature /℃abcR2
    2513.54–8.7412.740.8891
    –510.97–7.58178.820.9504
    –1011.83–8.52192.340.9905
    –1512.11–10.39135.680.9582
    –2016.98–13.92261.680.9533
    –2513.26–10.01192.090.9461
    Notes: R2 represents correction of fitting.
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