【摘要】 高温环境下,岩石表现为明显的宏观破裂特征.本实验在细观尺度下观测了不同温度条件下,阜新细砂岩的矿物组分和微结构及其发展变化,以及内部微裂纹的发生和发展.从实验中观察到,自15 0℃开始,阜新细砂岩微裂纹数量有剧烈的增加,并达到峰值;当温度超过2 10℃以后,可见裂纹的数量呈下降趋势并逐渐稳定;当温度达到810℃,细砂岩裂纹数量出现第二个增长峰值.结果表明随着温度变化,细砂岩存在热破裂阀值.更多还原

【Abstract】 Rock exhibits apparently a macro cracking character in high temperature environment. By means of experiment, the development of Fuxin fine sandstone minerals formation, micro configuration and the inner micro cracks were observed on a scale. During the experiment, it was observed that the micro cracks’ number of Fuxin fine sandstone acutely increases and reached the peak value from 150℃.The descendend trend happened to the number of eyeable cracks when temperature exceeded 210℃.Later, the number gradually stabilizes. The second peak value of fine sandstone cracks’ number appeared at 810℃. The thermal cracking threshold of fine sandstone was determined with the change of temperature.更多还原