基于声发射和能量演化规律评价岩石脆性的方法
发布时间：2018-11-15 18:48
【摘要】：基于声发射记录的能量和能量演化规律提出了一种新的评价岩石脆性的方法.通过不同加载速率下红砂岩的单轴压缩试验和不同温度下花岗岩的单轴压缩试验对新方法进行了检验,结果表明:红砂岩脆性随着加载速率增加而增大;花岗岩脆性随温度的升高存在2个阈值温度,第一阈值温度为200℃,第二阈值温度为800℃,与实际脆性程度相符.随后利用新的脆性评价方法分析了岩性、围压、层状岩石层理倾向及饱水对脆性的影响,数值显示:高水填充石、原煤、泥岩、砂岩、页岩、花岗岩的脆性依次增大,其中花岗岩的脆性指数是高水填充石的3.15倍;红岩石脆性随围压增大而减小,围压30MPa时其脆性指数相比单轴压缩时的脆性指数降低了21.5%;无论干燥还是饱水,层状砂岩随着层理倾角的增加,脆性先是快速增大后缓慢增大,90°砂岩的脆性指数在干燥和饱水下分别是0°时的1.80和1.34倍,饱水降低了层状砂岩的脆性.
[Abstract]:Based on the energy and energy evolution of acoustic emission records, a new method for evaluating rock brittleness is proposed. The new method is tested by uniaxial compression test of red sandstone at different loading rates and uniaxial compression test of granite at different temperatures. The results show that the brittleness of red sandstone increases with the increase of loading rate. There are two threshold temperatures for granite brittleness with increasing temperature. The first threshold temperature is 200 鈩，
本文编号：2334134
[Abstract]:Based on the energy and energy evolution of acoustic emission records, a new method for evaluating rock brittleness is proposed. The new method is tested by uniaxial compression test of red sandstone at different loading rates and uniaxial compression test of granite at different temperatures. The results show that the brittleness of red sandstone increases with the increase of loading rate. There are two threshold temperatures for granite brittleness with increasing temperature. The first threshold temperature is 200 鈩，
本文编号：2334134
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