黑龙江科技大学学报2023，Vol.33Issue(6)：875-881,7.DOI:10.3969/j.issn.2095-7262.2023.06.016
偏载作用下三孔洞砂岩的力学特性及声发射特征
Mechanical properties and acoustic emission characteristics behind three-holes sandstone under bias loading
摘要
Abstract
This paper aims to study local deformation and overall damage law behind the defective coal rock under bias loading.The study includes performing the bias load test on three-holes sandstone with different morphology by using TYJ-500 electro-hydraulic servo rock shear rheology tester,monito-ring and analyzing the mechanical properties and acoustic emission characteristics in the process of sand-stone specimen damage evolution by means of acoustic emission technology.The test results show that the spatial distributon of holes affects the compressive strength and elastic modulus of sandstone,and the de-terioration effect of oblique three holes on mechanical properties is evident;Beyond the oblique three holes,the stress-strain curves of the plastic yielding stage have fluctuating characteristics,which indi-cates that the holes at the non-dominant rupture surface have localized damage firstly;By analyzing the distribution pattern of the cracks,the eccentric load has a greater influence on the main crack develop-ment of horizontal and vertical three holes,while the main crack distribution of oblique and face three holes is controlled by hole space pattern;and the acoustic emission characteristic parameters of vertical space distribution of three holes have weakened effect compared with the distribution of other three holes.关键词
孔洞砂岩/偏心载荷/声发射/破裂形态Key words
hole sandstone/eccentric load/acoustic emission/rupture morphology分类
矿业与冶金引用本文复制引用
刘刚,王冬伟,杨志涛..偏载作用下三孔洞砂岩的力学特性及声发射特征[J].黑龙江科技大学学报,2023,33(6):875-881,7.基金项目
黑龙江省自然科学基金资助优青项目(YQ2023E039) （YQ2023E039）
黑龙江省普通高校青年创新人才培养计划项目(UNPYSCI-2020029) （UNPYSCI-2020029）
