Non-parallel double-crack propagation in rock-like materials under uniaxial compression
Weidong Pan
Xin Wang
Qiming Liu
Yongkang Yuan
Baodong Zuo
摘要：Coalescence among fractures would have influence on the stability of rock masses.Deep understanding of mechanical behavior of fractured rock masses is an important mean to identify failure mechanism of geological disaster.In this study,crack propagation processing was studied through loading pre-fractured specimens of concrete block,termed as rock-like material,in uniaxial compression tests.New non-parallel double-crack geometry was introduced to observe crack coalescence.The flaw combinations are different from the normally used flaw configurations.In addition,ultrasonic detection tests were performed on the test blocks.The stress and strain data of these tests and characteristic parameters of sound wave were recorded.The stress-strain curves of each test block under the uniaxial compression test were drawn,relations among deformation characteristics and crack angle of the crack specimens,and their overall strength were analyzed.It is found that strength of the specimen decreases as crack inclination increases under two crack inclinations.The highest uniaxial compressive strength is found in the specimen with the cracks at the same angle in different directions.Based on description of the crack initiation location,crack surface and the ultimate failure patterns,failure modes of eight subtype for test blocks are divided into three categories.It is expected that the study results could be beneficial for engineering application of jointed rock masses.
机标关键词：
资助基金：The authors gratefully acknowledge the financial support from the National Key Research and Development Plan(2018YFC0604501)the Yue Qi Distinguished Scholar Project,China University of Mining & Technology,Beijing(800015Z1138)
论文发表日期：2019-01-01
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：16( 372-387 )
英文信息