采矿与安全工程学报2025，Vol.42Issue(2)：394-403,10.DOI:10.13545／j.cnki.jmse.2023.0342
不同次裂隙数目条件下岩石力学特性及破坏模式
Rock mechanics characteristics and failure modes under different number of secondary fractures
摘要
Abstract
To investigate the influence of secondary fractures quantity on the mechanical properties and failure modes of red sandstone samples,uniaxial compression was performed on red sandstone samples with different numbers of secondary fractures.Combined mechanical data and acoustic emission parame-ters acquired from various sample loads,the analysis of the failure process is analyzed.The results show that as the number of fractures increases,the peak strength and elastic modulus of the sample continuous-ly decrease,and the rate of change gradually decreases.The number of secondary fractures has a rela-tively small impact on the strength of the red sandstone specimen than prefabricated main fractures have;The fracture toughness of red sandstone is related to its uniaxial compressive strength.Specimens with higher compressive strength exhibit greater fracture toughness.Prefabricated secondary fractures have a guiding effect on the initiation of fractures in the sample,with new fractures mainly concentrated at the tips of secondary fractures.As the number of secondary fractures increases,the failure mode transits to-wards a tensile-shear composite failure,dominated by shear failure.关键词
裂隙数目/单轴压缩/力学特性/声发射/断裂韧度Key words
number of cracks/uniaxial compression/mechanical properties/acoustic emission/fracture toughness分类
矿业与冶金引用本文复制引用
余伟健,周明娟..不同次裂隙数目条件下岩石力学特性及破坏模式[J].采矿与安全工程学报,2025,42(2):394-403,10.基金项目
国家自然科学基金项目(52174076,52474096) （52174076,52474096）
湖南省自然科学基金项目(2023JJ30261) （2023JJ30261）
湖南省科技创新计划项目(2024RC1065) （2024RC1065）
