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模拟巷道动水条件下聚氨酯堵水试验研究
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作者 王正胜 《煤炭科学技术》 CAS 北大核心 2013年第S2期72-74,77,共4页
以水溶性聚氨酯为研究主体,对其基本性能进行研究。采用动水模拟试验装置对不同骨料粒径、注浆泵量、动水流速及压力下的注浆及堵水性能进行了模拟试验。研究表明:骨料空隙率越小、注浆泵量越大,注浆堵水效果越好;在动水流速为3.02m/mi... 以水溶性聚氨酯为研究主体,对其基本性能进行研究。采用动水模拟试验装置对不同骨料粒径、注浆泵量、动水流速及压力下的注浆及堵水性能进行了模拟试验。研究表明:骨料空隙率越小、注浆泵量越大,注浆堵水效果越好;在动水流速为3.02m/min条件下,结石体最大抗渗压力达25MPa,结石率可达100%~350%;在动水压力大于5MPa时,聚氨酯能很好固化,发泡倍数大于1.4倍。 展开更多
关键词 聚氨酯 条件 注浆堵 巷道动水
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Numerical simulation study on hard-thick roof inducing rock burst in coal mine 被引量:7
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作者 HE Jiang 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第9期2314-2320,共7页
In order to reveal the dynamic process of hard-thick roof inducing rock burst, one of the most common and strongest dynamic disasters in coal mine, the numerical simulation is conducted to study the dynamic loading ef... In order to reveal the dynamic process of hard-thick roof inducing rock burst, one of the most common and strongest dynamic disasters in coal mine, the numerical simulation is conducted to study the dynamic loading effect of roof vibration on roadway surrounding rocks as well as the impact on stability. The results show that, on one hand, hard-thick roof will result in high stress concentration on mining surrounding rocks; on the other hand, the breaking of hard-thick roof will lead to mining seismicity, causing dynamic loading effect on coal and rock mass. High stress concentration and dynamic loading combination reaches to the mechanical conditions for the occurrence of rock burst, which will induce rock burst. The mining induced seismic events occurring in the roof breaking act on the mining surrounding rocks in the form of stress wave. The stress wave then has a reflection on the free surface of roadway and the tensile stress will be generated around the free surface. Horizontal vibration of roadway surrounding particles will cause instant changes of horizontal stress of roadway surrounding rocks; the horizontal displacement is directly related to the horizontal stress but is not significantly correlated with the vertical stress; the increase of horizontal stress of roadway near surface surrounding rocks and the release of elastic deformation energy of deep surrounding coal and rock mass are immanent causes that lead to the impact instability of roadway surrounding rocks. The most significant measures for rock burst prevention are controlling of horizontal stress and vibration strength.Key words 展开更多
关键词 hard-thick roof rock burst numerical simulation horizontal stress stress wave
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