不同压力CO2作用对煤体冲击倾向性的影响研究
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太原理工大学

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山西省应用基础研究计划(20210302124440);深部岩土力学与地下工程国家重点实验室开放(SKLGDUEK1820)。


Study on the influence of CO2 under different pressure on coal bursting liability
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Taiyuan University of Technology

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    摘要:

    煤体冲击倾向性研究对于探明地下深部煤炭开采过程中冲击地压形成机理起着关键作用。为了探究不同压力CO2作用对煤体冲击倾向性的影响,本文对不同压力CO2浸泡作用后煤试件进行单轴压缩及变上限循环加卸载试验。试验结果表明:与压力为2 MPa、4 MPa、6 MPa、8 MPa与10 MPa的CO2作用后,煤试件单轴抗压强度分别下降了9.97%、16.14%、25.02%、45.97%与52.77%,弹性模量分别降低了11.01%、18.35%、27.52%、44.95%。随着CO2浸泡压力的增加,煤样力学特性劣化程度逐渐加剧,声发射累积事件总数降低,并从微观层面解释了CO2作用对煤体的损伤机理。不同压力CO2浸泡后煤试件变上限循环加卸载过程中的输入能Unin与弹性能Une之间均符合线性关系;经过2 MPa、4 MPa、6 MPa、8 MPa与10 MPa压力的CO2作用后,较之原始煤试件剩余弹性能指数CEF分别降低了9.35%、17.16%、25.54%、47.18%与55.48%,表明CO2对煤体冲击倾向性具有弱化作用,且CO2达到其超临界态时对于减弱煤体冲击倾向性的效果更为明显。

    Abstract:

    The study of coal burst liability plays a key role in exploring the formation mechanism of rock burst during deep underground coal mining. In order to explore the influence of CO2 at different pressures on coal bursting liability, uniaxial compression and cyclic loading and unloading tests with variable upper limit were carried out on coal specimens after CO2 immersion at different forces. The test results show that: The uniaxial compressive strength of coal specimens decreased by 9.97%, 16.14%, 25.02%, 45.97% and 52.77% respectively after being treated with CO2 at pressures of 2 MPa, 4 MPa, 6 MPa, 8 MPa and 10 MPa. The elastic modulus decreased by 11.01%, 18.35%, 27.52% and 44.95%, respectively. With the increase of CO2 soaking pressure, the deterioration degree of mechanical properties of coal samples is gradually aggravated, and the total number of AE cumulative events decreases, which explains the damage mechanism of CO2 to coal body from the micro level. There is a linear relationship between the input energy Unin and the elastic energy Une in the process of cyclic loading and unloading with variable upper limit after CO2 immersion at different pressures. Compared with the original coal specimen, the residual elastic energy index CEF decreased by 9.35%, 17.16%, 25.54%, 47.18% and 55.48%, respectively, after the effect of CO2 at pressures of 2 MPa, 4 MPa, 6 MPa, 8 MPa and 10 MPa, indicating that CO2 has a weakening effect on the coal bursting tendency. When CO2 reaches its supercritical state, the effect on reducing the bursting liability of coal is more obvious.

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  • 收稿日期:2022-11-19
  • 最后修改日期:2022-11-19
  • 录用日期:2023-01-13
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