黄金科学技术 ›› 2022, Vol. 30 ›› Issue (6): 935-947.doi: 10.11872/j.issn.1005-2518.2022.06.041
Guangsheng DU1(),Shijiang CHEN1,2(),Hailong WU3
摘要:
在地下工程中,温度变化对岩体力学性质有着极大的影响,而宏观力学性质与细观微裂隙发育损伤密不可分。为探究在温度循环条件下岩石细观损伤机理与宏观力学性质之间的关系,对花岗岩进行不同温度下的高温水冷循环试验,并采用低场核磁系统进行细观孔隙参数检测,同时开展了单轴抗压强度试验。结果表明:(1)温度的上升和循环次数的增加均会导致花岗岩弹性模量和单轴抗压强度力学性质的降低,400 ℃是花岗岩性质变化的临界点;(2)核磁检测可以获取试件的孔隙分布参数,由该参数及试件宏观性质变化可以得出,200~600 ℃时温度循环所引起的细观损伤规律有明显差异;(3)花岗岩损伤值随着温度的升高而升高,但温度循环引起的多次损伤随温度的升高呈现出先增加后减小的趋势。微裂隙尺度、含量与试件单轴强度、应变的相关性分别为-0.943和0.935。
中图分类号:
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