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高压气体诱发煤岩动力破坏的实验研究

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丁言露, 岳中琦. 2021. 高压气体诱发煤岩动力破坏的实验研究. 地质力学学报, 27(4): 643-651. doi: 10.12090/j.issn.1006-6616.2021.27.04.053
引用本文: 丁言露, 岳中琦. 2021. 高压气体诱发煤岩动力破坏的实验研究. 地质力学学报, 27(4): 643-651. doi: 10.12090/j.issn.1006-6616.2021.27.04.053
shu
DING Yanlu, YUE Zhongqi. 2021. Experimental study on the dynamic rupture of coal and rock caused by high-pressure gas. Journal of Geomechanics, 27(4): 643-651. doi: 10.12090/j.issn.1006-6616.2021.27.04.053
Citation: DING Yanlu, YUE Zhongqi. 2021. Experimental study on the dynamic rupture of coal and rock caused by high-pressure gas. Journal of Geomechanics, 27(4): 643-651. doi: 10.12090/j.issn.1006-6616.2021.27.04.053
shu

高压气体诱发煤岩动力破坏的实验研究

  • 1.

    北京大学工学院, 北京 100871

  • 2.

    北京大学北京天然气水合物国际研究中心, 北京 100871

  • 3.

    香港大学土木工程系, 香港特别行政区 999077

  • 基金项目:
    香港研究资助局资助项目（HKU17204415，HKU17207518）
详细信息
    作者简介: 丁言露(1990-), 男, 博士, 助理研究员, 从事岩土工程研究方向。E-mail: ylding@pku.edu.cn
    通讯作者: 岳中琦(1962-), 男, 博士, 教授, 从事岩土工程研究方向。E-mail: yueqzq@hku.hk

  • 中图分类号: TD315

Experimental study on the dynamic rupture of coal and rock caused by high-pressure gas

  • 1.

    College of Engineering, Peking University, Beijing 100871, China

  • 2.

    Beijing International Research Center for Gas Hydrate, Peking University, Beijing 100871, China

  • 3.

    Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR 999077, China

  • Fund Project: This research is financially supported by the Hong Kong Research Grants Council (Grant No.HKU 17204415, HKU 17207518)
More Information

    摘要

  • 为了研究高压气体对煤岩材料变形破坏的作用，自主设计并制造了含高压气体煤岩实验装置，通过测量气体泄压作用诱发的煤岩动力破坏现象，研究了高压气体对煤岩材料变形破坏的作用。实验表明，当气体泄压速率小时，煤岩仅会出现轻微变形；当气体泄压速率大时，煤岩会产生破裂和破碎现象。同时发现煤岩的破坏程度不仅取决于气体的泄压速率，还取决于孔隙气体的压强。当气体泄压速率和气体压强都达到一定临界值时，煤岩才会发生剧烈破碎。通过气体压强与应变之间的关系，确定了煤岩发生破裂和破碎的临界气体压强。

    A special test apparatus has been designed and used to study the effect of high-pressure gas on the deformation and failure of coal and rock. Dynamic ruptures of coal and rock are carried out by gas decompression. The results show that low gas decompression rate only causes deformation of coal specimens slightly while high gas decompression rate leads to fracture and outburst phenomenon. The degree of damage of rocks depends on not only the gas decompression rate but also the gas pressure. Violent fragmentation occurs when gas decompression rate and high saturation pressure reach critical values. According to the relationship between the decompressed gas pressure and strain, the critical gas pressures are determined for the fracture and fragmentation of specimens.

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  • 图 1  含高压气体煤岩实验装置图

    Figure 1. 

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    图 2  充入气体压强为0.5 MPa时快速泄压引起的试样破裂(时间间隔16.7 ms)

    Figure 2. 

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    图 3  充入气体压强为1.0 MPa时快速泄压引起的试样破裂(时间间隔16.7 ms)

    Figure 3. 

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    图 4  四组试验的试样在气体渗入和吸附过程中的应变变化

    Figure 4. 

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    图 5  试样在气体泄压过程中的应变变化

    Figure 5. 

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    图 6  气体泄压速率随时间变化图

    Figure 6. 

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    图 7  气体压强和应变变化关系

    Figure 7. 

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    图 8  充气过程与放气过程对煤岩体孔隙影响

    Figure 8. 

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    表 1  实验参数与结果

    Table 1.  Summary of the experimental data and results

    编号 初始条件 测试条件 测试结果
    尺寸直径×高度/mm 饱和气压*/MPa 平均泄压速率/(MPa/s) 破裂压强/kPa 破碎压强/kPa 充气过程最大体积应变/×10-3 放气过程最大体积应变/×10-3 试样结果
    A Φ35.00×35.58 0.5 0.4 - - 4.944 -1.286 完整
    B Φ35.00×35.04 1.0 0.3 - - 7.392 -2.104 完整
    C Φ35.00×34.96 0.5 6.6 340 - 5.259 7.680 破裂
    D Φ35.00×36.16 1.0 8.2 - 960 7.349 12.015 破碎
    *注：气体压强数值为高于大气压强的差值
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收稿日期:  2021-04-29
修回日期:  2021-07-01
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