黄金科学技术 ›› 2022, Vol. 30 ›› Issue (5): 778-786.doi: 10.11872/j.issn.1005-2518.2022.05.053
Yuzhang LAI1(),Xueyi ZHI1,Ronghua SHU1,2()
摘要:
针对深部高地应力及多岩层复杂地质条件,采用伺服控制试验机对复合岩石进行室内力学试验,重现复合岩石在高应力作用下的破坏过程。复合岩石由强度差且强度呈均匀阶梯型的单岩组成,可划分为蛇纹岩—矽卡岩和蛇纹岩—砂岩。通过单轴压缩试验,获得岩石的单一和复合形态下的力学性质与破坏特性。研究结果表明:在高应力作用下,复合岩石中岩石强度较弱的部分首先发生破坏,且初始裂纹的萌生位置和发展模式直接决定了岩样的最终破坏形态;复合岩石与单一岩石之间的抗压强度存在相关性;利用理想弹簧模型可对复合岩石的弹性模量和峰值应变进行推导。复合岩石的力学特性由强弱端岩石共同决定,存在一定的规律性,其破坏特性与单一岩石相似,但较弱端占主要影响地位。
中图分类号:
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