School of Resources and Safety Engineering,China University of Mining and Technology (Bejing)National KeyLab of Coal Resources and Safe Mining.China University of Mining and Technology (Beijing)School of Mechanics and Civil Engineering,China University of Mining and Technology (Beijing)

为了研究温度对煤岩体中波速传播的影响,利用自制的声波参数测试系统试验研究了煤岩体波速随温度变化规律,以期为研究声波在煤岩体中的传播提供理论参考。研究结果表明:随温度升高,煤岩体试样内纵横波波速总体表现为减小,在减小过程中会出现波动现象。试样的波阻抗大小与波速大小之间具有高度正相关特性。温度的升高将使煤岩体内各种矿物成分发生热膨胀,但由于这些矿物种类不同,其热膨胀系数也不同,导致其中的微孔隙或裂隙发生增长和扩大,煤岩体孔隙结构发生变化,煤岩体弹性模量和波速减小;另外,温度的升高会造成煤岩体内矿物质或胶结物的变化,从而导致煤岩体弹性模量和波速的降低。

in order to study the temperature affected to the wave velocity ransmission in the coal and rok mass a sef developed acoustic wave parameter est systen was aplied to the experiment study on the wave veocty law of the coal and rock mass with the temperature vaiation to provide theoretical references to the stutdyon the acoustic wave trasmnission in the coal and rock mass. The study reasuts showed that with the temperature increased,the wave velocity of the P wave and S-wae in the coal and rock samples would in a reduction genfrlly nd would have an undulatory phenomenon.There was a igh postive corelation feature between the wave inmpedance size and wave velocity size of the coal samples.The temperature rose would cause heat exvpansion f differert mineral contens in the cal nd rock mass.Due to the diferent types of the minerals the heat expansion ceficsent would be dfferent,the micro pores and crack n the coal and rock mass oud be inreased and expanded .The porous structure of the coal and ock mass would be varied and the elstic modulus and wave velcity of the coal and ock mass ould be reduc.ed.Meanwhie,the temperature rose would cause the variation of the mineral nd binding material in the cal nd rok mass and thus the elastc modulus and wave velocity of the coal and rock mass would be reduced.

国家自然科学基金资助项目(51304212)；教育部高等学校博士学科点专项科研基金资助项目(20120023120005)；北京高等学校青年英才计划资助项目(YETP0930)；中央高校基本科研业务费专项资金资助项目(2009QZ09)；