期刊论文

Cyclic Impact Test of Hole-bearing Rock Under Static Stress

中文

黄金科学技术

1005-2518

2020

28

04

531-540

10.11872/j.issn.1005-2518.2020.04.193

国家自然科学基金青年基金项目“动应力场与渗流场耦合下卸荷裂隙岩体动态损伤演化机制研究”（编号：51804163）； 中国博士后基金面上项目“金属矿深竖井开挖变形破坏机理与能量演化规律研究”（编号：2018M642678）联合资助；

本校为第一机构

为探究地下工程开挖过程中外部荷载对周边围岩多重扰动作用的影响,进一步开展岩石在动静组合作用下的循环冲击试验研究,通过改进式SHPB试验装置研究含横向贯通孔洞花岗岩(φ50 mm×50 mm)在循环冲击荷载下的动态力学特性,采用轴压水平分别为0MPa,0.3σf,0.4σf,0.5σf,0.6σf,0.7σf进行循环冲击试验(σf为单轴平均抗压强度,单位为MPa)。结果表明:在冲击荷载作用下,峰值应力随着冲击荷载作用次数的增加先增大后减小,并随着平均应变率的增大而增大;弹性模量随着冲击次数的增加先增大后降低,在不同轴压水平作用下试件冲击破坏形态均为轴向劈裂破坏模式;随着应变速率增大,破裂面逐渐增多,破碎程度加...

Along with the development of underground engineering in recent decades,the underground engineering excavation depth and the construction scale is increasing.In the deep-layer rock engineering activities, the researchers observed that deep rocks are subjected to huge in-situ stress in all directions,which has a nonnegligible effect on the mechanical properties of the rock. In order to ensure the safety of underground engineering construction,technician must solve the deep strata of rock“high geostress”and so on.With the deepening of undergrou...