| 温度作用下缺陷花岗岩热损伤:以甘肃北山缺陷花岗岩为例 |
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| 引用本文： | 高红梅,兰永伟,周莉,孟丽岩.温度作用下缺陷花岗岩热损伤:以甘肃北山缺陷花岗岩为例[J].吉林大学学报(地球科学版),2017(6):1795-1802. |
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| 作者姓名： | 高红梅 兰永伟 周莉 孟丽岩 |
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| 作者单位： | 1. 黑龙江科技大学建筑工程学院,哈尔滨,150022;2. 黑龙江科技大学矿业工程学院,哈尔滨,150022 |
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| 基金项目： | 国家自然科学基金项目，黑龙江省自然科学基金项目，黑龙江省普通高等学校采矿工程重点实验室开放课题，Supported by National Natural Science Foundation of China，National Natural Science Foundation of Heilongjiang Province，Open Project of Key Laboratory of Mining Engineering of Heilongjiang Ordinary Higher Education Institutions |
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| 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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| 关 键 词： | 缺陷花岗岩 热损伤 热应力 甘肃北山 |
Thermal Damage of Granite with Fracture Under Temperature Effect: A Case Study on Beishan Granite in Gansu |
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| Abstract: | In order to study on thermal damages of detective granite under temperature effect,an analysis on thermal stress of cracked granite was conducted through applying the theories of thermodynamics and damage mechanics.The critical stress formula of thermal damage of cracked granite was derived,further the influence of high temperature on the variation of the thermal elastic ratio of granite was analyzed,and then the thermal damage evolution equation of granite under temperature was established,finally the possible forms of the stress damage surface of granite under temperature were studied.A numerical simulation of the internal structure,crystal element damage,and stress variation of the Beishan defective granite under temperature was carried out.When the temperature rose to 60 ℃,a significant thermal damage occurred near the cracks of granite,and the damage was small far away from the cracks.When the temperature rose to 120 ℃,the shear failure characteristics of granite defects were obvious,the thermal damage near crack increased seriously,and the uninterrupted damages appeared obviously away from the defects.Under 120 ℃,a sudden change came out for the damage amount,the thermal stress,and the cumulative energy.Thereafter,with the increase of temperature to 200 ℃,the increment of damage is weak.The results show that there is a direct relationship between the damage and the temperature of Beishan granite with defects. |
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| Keywords: | defective granite thermal damage thermal stress Beishan Gansu |
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