安全与环境工程2025，Vol.32Issue(5)：33-46,14.DOI:10.13578/j.cnki.issn.1671-1556.20250152
循环荷载作用下拱肩非连续面-洞室模型损伤破裂机制试验研究
Experimental study on damage and fracture mechanism of arch shoulder discontinuity-cavern models under cyclic loading
摘要
Abstract
The progressive damage mechanism of fault-bearing underground caverns under cyclic loading is one of the key scientific problems in the field of rock engineering.In this paper,the strength characteristics and deformation mechanism of the arch shoulder discontinuity-cavern models under cyclic loading are investigated systematically by combining indoor tests and numerical simulations.In the study,acoustic emission(AE),resistivity testing and digital image correlation(DIC)techniques was used to achieve multi-dimensional and simultaneous monitoring of the damage evolution process of the model.The results show that the presence of faults significantly weakens the load-bearing performance of the cavern structure,and its compressive strength increases with the increase of the discontinuity-cavern spacing and the angle.The rupture mode of the complete chamber model is mainly manifested as the settlement of the vault and the damage of the side walls,while the rupture behaviour of the discontinuity-cavern models is controlled by the inclination angle of the discontinuity,and the rupture modes under the same inclination angle are similar,and the damage of the structure as a whole increases with the decrease of the discontinuity-cavern spacing.The monitoring data show that the resistivity value decreases continuously with the loading process and changes regularly with the load fluctuation;the acoustic emission activity is weak at the beginning of the loading process,and then becomes active when approaching the peak intensity.The geometric parameters of the faults have less influence on the evolution of the acoustic emission events,but have a significant control on the distribution of crack types:small-dip discontinuities are dominated by tension cracks,while large-dip discontinuities are more prone to develop shear cracks.The experimental results better reproduce the crack extension process of the discontinuity-cavern models,which provides a reliable basis for revealing the rupture mechanism,and the research results provide important theoretical support for the stability evaluation and disaster prevention and control of underground cave projects in discontinuity-affected areas.关键词
物理模型/非连续面-洞室/地下洞室/电阻率/声发射(AC)/数字图像相关(DIC)Key words
physical model/discontinuity-cavern/underground cavern/resistivity/acoustic emission(AE)/digital image correlation(DIC)分类
资源环境引用本文复制引用
江浩,李仁杰,王立波,陈卫兵,于生飞,张胜..循环荷载作用下拱肩非连续面-洞室模型损伤破裂机制试验研究[J].安全与环境工程,2025,32(5):33-46,14.基金项目
国家自然科学基金项目(52279117) （52279117）
