黄金科学技术 ›› 2020, Vol. 28 ›› Issue (6): 877-884.doi: 10.11872/j.issn.1005-2518.2020.06.096
Jingyu GUO(),Chengzhi PU(),Guicheng HE,Yilong LI,Shaofeng YANG,Jiajun ZENG
摘要:
为了探究加载速率和裂隙倾角复合影响的裂隙体类岩石材料破断规律,对含0.1 mm预制裂隙的类岩材料进行静态到准静态的不同加载速率单轴压缩试验,基于声发射测试技术,分析含预置裂隙类岩材料起裂强度规律。结果表明:相同加载速率下,峰值强度随预制裂隙倾角增大呈现先减小后增大的变化趋势,倾角为45°时最小,裂隙倾角相同时,裂隙体峰值强度随加载速率的增大而增大;准静态加载范围内存在一个临界加载速率即2.0×10-4 s-1,使得加载速率强化效应不再显著;低频信号占比逐渐升高,可作为裂隙体失稳前兆信息;裂隙倾角相同时,裂隙体起裂应力水平随加载速率的增大而增大,相同加载速率下,裂隙体起裂应力水平随倾角的增大而增大。
中图分类号:
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