高温石灰岩纵波波速的实验研究
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摘要
通过对石灰岩试件常温至800℃高温过程中的物理特性及声学特性进行实验研究.结果表明,高温后由于水分的挥发、矿物水化物、有机物的分解石灰岩试件的质量逐渐减少.石灰岩试件尺寸的变化主要是物理变化以及部分化学变化引起的.随着温度升高,石灰岩试件的纵波波速逐渐减小,纵波波速的衰减在500℃以前较小,在500℃以后衰减增大.因为500℃以前石灰岩结构较密实,孔隙的直径、数量较少,对纵波的影响较小,纵波速度衰减也较小;500℃以后结构较疏松,孔隙数量增多、长度加大,纵波衰减也较大.500℃是石灰岩试件尺寸、质量、纵波衰减变化的一个分界点.
The physical characteristics and acoustic characteristic of limestone samples are tested from constant temperature to 800℃.The results show that the quality of limestone samples becomes less because of the evaporation of water,the decomposition of mineral,hydrate and organic matter.The dimension variation of limestone samples is caused by physical and chemical change.The longitudinal wave velocity gradually decreases with the temperature increasing.The longitudinal wave velocity attenuates less before 500℃,and attenuates more after 500℃.The longitudinal wave velocity is influenced less and its attenuation is smaller because the structure of limestone is dense and the diameter and amount of spore space are less in the limestone before 500℃;the velocity attenuates more because the structure is loosen and the amount and length of spore space increases after 500℃.500℃ is a demarcation point of the variation of quality,dimension and the velocity of limestone.
The physical characteristics and acoustic characteristic of limestone samples are tested from constant temperature to 800℃.The results show that the quality of limestone samples becomes less because of the evaporation of water,the decomposition of mineral,hydrate and organic matter.The dimension variation of limestone samples is caused by physical and chemical change.The longitudinal wave velocity gradually decreases with the temperature increasing.The longitudinal wave velocity attenuates less before 500℃,and attenuates more after 500℃.The longitudinal wave velocity is influenced less and its attenuation is smaller because the structure of limestone is dense and the diameter and amount of spore space are less in the limestone before 500℃;the velocity attenuates more because the structure is loosen and the amount and length of spore space increases after 500℃.500℃ is a demarcation point of the variation of quality,dimension and the velocity of limestone.
引文
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[2]刘斌.不同温压下弹性波速度、衰减及各向异性与组构的关系[J].地学前缘,2000,7(1):247-257.
[3]杜守继,刘华,职洪涛,等.高温后花岗岩的力学性能的实验研究[J].岩石力学与工程学报,2004,23(14):2 359-2 364.
[4]谢洪森,周文戈,刘永刚.高温下岩石弹性波速度几种测量方法的比较实验研究[J].中国科学:D辑,2000,32(2):121-126.
[5]周继成,章成广.疏松砂岩超声波测试及其结果分析[J].石油地球物理勘探,1999,34(3):290-294.
[6]叶明亮,邹义怀.原岩应力超声波检测及应力场分析[J].岩土工程学报,1998,20(5):31-36.
[7]孙成栋.岩石声学测试[M].北京:地震出版社,1981.
[8]М.П.伏拉洛维奇.高温高压下岩石和矿物物理性质的研究[M].北京:地震出版社,1982.
[9]顿志林,晁俊奇,刘希亮,等.高温双向约束下岩石膨胀应力测试装置的研制[J].河南理工大学学报:自然科学版,2008,27(6):685-688.
[10]晁俊奇.高温双向约束下石灰岩组构及物理力学性能试验研究[D].焦作:河南理工大学,2008.
[11]秦本东,晁俊奇,谌伦建,等.高温双向约束条件下石灰岩的组构分析[J].采矿安全与工程学报,2009,26(2):244-248.
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