期刊论文

Analysis on damage characteristics and energy dissipation of rock with a single hole under cyclic impact loads

中文

中国安全科学学报

1003-3033

2020

30

7

69-77

10.16265/j.cnki.issn1003-3033.2020.07.011

国家自然科学基金青年项目资助(51804163) 中国博士后基金面上项目资助(2018M642678)。

本校为第一机构

为探究隧道工程开挖过程中外部荷载对隧道围岩多重扰动的影响,采用霍普金森压杆(SHPB)装置进行不同冲击荷载(0.6、0.7、0.8 MPa)和冲击方式(等幅与不等幅冲击气压)下的循环冲击试验,以此分析冲击载荷作用下含孔洞岩石试件的动力学特性、损伤特征、能量耗散和破坏形态。结果表明:基于一维应力波理论和界面连续条件得到适用于含竖向孔洞岩石试件计算的改良损伤计算公式;竖向孔洞的存在会影响岩石应力-应变曲线的变化趋势,并在经历数次冲击后尤为显著;花岗岩损伤积累随平均应变率增大呈幂函数增长,且随冲击荷载的增加呈现良好的规律性;积累比能量吸收值随循环冲击的进行逐渐增大,且试件的破坏模式经...

In order to explore influence of external load on multiple perturbations of surrounding rock during tunnel excavation, cyclic impact load tests of rock with a single hole were carried out by using Split Hopkinson Pressure Bar (SHPB) device under different impact loads (0.6, 0.7, 0.8 MPa) and impact methods (impact pressure of Equal-amplitude and Unequal-amplitude). Then, dynamic characteristics, damage characteristics, energy dissipation and failure modes of these rock specimens under impact loads were analyzed. The results show that based on one-dimensional stress wave theory and interface co...