摘要
岩石或岩体内部的裂隙扩展及闭合对于评判其稳定性至关重要,目前尚难以对其进行监测和表征。为此,提出了一种利用超声波测厚仪监测岩石内部裂隙扩展及闭合情况的方法,找寻潜在的内部破坏区域,进行危险块的提前识别。为了验证这种设想,进行了相关的试验。试验结果表明:超声波测厚仪测量的各监测点的测厚值不断发生变化,并不具有较一致的规律性,说明岩石内部的裂隙扩展闭合存在加载过程中的因应性,表明了岩石内部裂纹扩展闭合的复杂性。岩石内部的裂隙扩展及闭合在加载前期和后期相应的超声波测厚值起伏较大,说明局部区域内部的裂隙扩展或闭合存在较大的突变性。
The expansion and closure of fractures in a rock or rock mass is critical to assessing its stability,and at present, mo nitoring and characterization are still difficult. To this end, an ul- trasonic thickness gauge is proposed to monitor the expansion and closure of cracks inside a rock to find the potential internal poten- tia｜ damage surface and to identify the dangerous blocks in ad- vance. In order to verify this idea,the relevant testes were conduc- ted. The results showed that the measured thickness of the moni- toring points measured by the ultrasonic thickness gauge change constantly with the same regularity, which indicates that there is the adaptability of the expansion and closure of fractures in a rock during the loading process, which shows the complexity of expan- sion and closure cracks in a rock. The fluctuation of the corre- sponding ultrasonic thickness measurements on the expansion and closure of fractures in a rock in the initial and later periods of loading shows that there is a large mutation for the internal ex- pansion and closure of fractures in localities.
出处
《化工矿物与加工》
北大核心
2017年第10期43-46,共4页
Industrial Minerals & Processing
基金
国家自然科学基金项目(51604195)
关键词
超声波
测厚仪
危险块识别
裂隙
ultrasonic wave
thickness gauge
identification ofdangerous blocks
fracture
