吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (6): 1795-1802.doi: 10.13278/j.cnki.jjuese.201706202
高红梅1, 兰永伟2, 周莉1, 孟丽岩1
Gao Hongmei1, Lan Yongwei2, Zhou li1, Meng Liyan1
摘要： 为了研究温度作用下缺陷花岗岩的热损伤问题，以甘肃北山缺陷花岗岩为例，从损伤力学和热力学的角度出发，研究了缺陷花岗岩内部热应力的产生机理，推导出缺陷花岗岩裂纹热损伤的临界应力公式，分析了高温作用对花岗岩热弹性比能变化的影响规律，建立了温度作用下花岗岩热损伤演化方程，并对温度作用下花岗岩应力损伤面可能存在的形态进行了研究。对含缺陷的花岗岩在温度作用下结构内部结构晶体单元损伤、晶体单元损伤应力变化规律进行数值模拟，结果表明：当模拟温度升高到60℃时，花岗岩缺陷裂纹附近出现明显的热损伤，远离缺陷处出现微弱的热损伤；当温度升高到120℃时，花岗岩缺陷处剪切破坏特征明显，裂纹处的热损伤点继续增大，远离缺陷处出现非常明显的不间断损伤点，损伤量、热应力、能量累计数出现了突变；此后，随着温度升高到200℃，损伤增量变化微弱。北山缺陷花岗岩的损伤量和温度之间存在直接的演化关系。
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