岩土力学2025，Vol.46Issue(7)：2049-2061,2105,14.DOI:10.16285/j.rsm.2024.1229
深地灰岩三轴压缩声发射特征及破坏形式试验研究
Experimental study of acoustic emission characteristics and failure forms of deep-buried limestone under triaxial compression
摘要
Abstract
In order to explore the failure process of deep-buried limestone under different confining pressures,limestone samples were taken from the 1104 level of a mine in Huize,Yunnan Province,and subjected to triaxial compression tests under six confining pressure conditions(10,20,30,40,50 and 60 MPa),with the entire process being monitored synchronously using acoustic emission technology.Analyses were conducted on the stress-strain relationships,ringing counts,cumulative ringing counts,energy counts,cumulative energy counts,and failure modes of the limestone under different confining pressures.The results show that under different confining pressure conditions,the limestone experiences four sequential stages when subjected to axial pressure:elastic deformation,yielding,plastic development,and brittle failure.The AE energy changes and the fluctuations in the ringing count curve resulting from the development of internal fractures in the limestone under different confining pressures exhibit similar patterns,and the peak values of both gradually decrease as the confining pressure increases.The failure mode of the limestone is mainly shear failure.It exhibits'Y'-shaped cracks when failing at a confining pressure of 10 MPa and'I'-shaped cracks when failing at other confining pressures.Under high confining pressures,the fragmentation degree of the limestone decreases,the development of secondary cracks slows down,the limestone becomes more resistant to damage,and its compressive strength increases.The integrity of the crushed limestone increases as the confining pressure rises.关键词
三轴压缩/灰岩/声发射/力学特征/破坏模式Key words
triaxial compression/limestone/acoustic emission/mechanical characteristic/failure mode分类
建筑与水利引用本文复制引用
储超群,包兴佳,毛明发,吴顺川,崔贺佳..深地灰岩三轴压缩声发射特征及破坏形式试验研究[J].岩土力学,2025,46(7):2049-2061,2105,14.基金项目
国家自然科学基金项目(No.51934003) （No.51934003）
云南省重大科技专项(No.202102AF080001) （No.202102AF080001）
云南省创新团队资助项目(No.202105AE160023).This work was supported by the National Natural Science Foundation of China(51934003),the Major Science and Technology Special Project of Yunnan Province(202102AF080001)and the Program of Yunnan Innovation Team(202105AE160023) （No.202105AE160023）
