花岗岩受热微观损伤研究

Study on micro damage of granite under high temperature

为了研究高温后的花岗岩受热微观损伤,把花岗岩试件加热到规定温度后冷却,通过电镜扫描仪对其进行细观研究,对比分析不同温度作用下的花岗岩破坏区域SEM图像、并对能谱分析结果进行对比,从细观尺度揭示花岗岩受热微观劣化特征。通过能谱分析可得:室温~200℃之间花岗岩成份没有发生本质的变化;从电镜扫描图像分析室温到80℃之间,花岗岩微观变化较小;110℃到200℃之间花岗岩内部会沿着不同组成成份之间形成以沿晶面破裂的微观裂纹;当温度为110℃时候,在花岗岩内部沿着云母晶体周边部分出现微裂纹;当温度为130℃花岗岩内部云母周边形成联通的沿晶微裂纹;当温度为到160℃时花岗岩内部石英晶体之间出现沿晶裂纹;当温度为200℃时,在花岗岩内部会呈现一些穿晶微裂纹。其研究成果具有一定应用价值。

In order to study after high temperature heat damage to granite, granite specimens are heated to a predetermined temperature after cooling, through the micro electron microscope scanner research, comparative analysis under different temperature granite damage area SEM image and spectrum analysis results from the meso scale to reveal the microscopic deterioration characteristics of granite heating. Through spectrum analysis can be obtained between at room temperature to 200℃ granite composition did not change; from the SEM image analysis at room temperature to 80℃, granite microscopic changes smaller; When the temperature between 110℃ to 200 ℃,the granite along the internal between different composition formed by micro cracks along the rupture surface; When the temperature is 110℃, in the granite along the internal peripheral part of mica particles cracks; when the temperature is 130 ℃ within the granite formed around the mica Unicom intergranular microcracks; when the temperature reached 160℃ between the granite internal cracks appeared on the quartz crystal particles;At temperature of 200℃,granite will appear transgranular microcracks. The research results have certain application value.