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中文摘要：
以焦作矿务局古汉山矿煤层顶板砂岩为研究对象，研究了该砂岩在高温作用下产生热膨胀力的规律，并为寻找砂岩产生热膨胀力的原因进行了高温前、后超声波速和孔隙率研究。结果表明，该砂岩在高温作用下，随作用温度的升高，产生的热膨胀力逐渐增大；当温度低于300℃时，产生的热膨胀力较小：试验温度高于300℃时，热膨胀力逐渐增大。高温后超声波速研究和孔隙率变化研究证明了砂岩在高温作用下将发生热膨胀，产生热膨胀力。
英文摘要：
The law of expansive power of sandstone on the upper plank of coal bed in Guhanshan coal mine in Jiaozuo under high temperature is studied; and both the ultrasonic wave parameters and the porosity are also studied in order to find out the mechanism that causes the expansive power of sandstone under high temperature. The results show that the expansive power of the sandstone will become great gradmally when the temperature increases; and expansive power of the sandstone is small when the temperature is under 300 ℃ ; but it will become greater when the temperature is greater than 300 ℃. The study of the ultrasonic wave parameters and the porosity also indicates that the expansive power of sandstone will appear .
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