中南大学学报（自然科学版）2025，Vol.56Issue(2)：688-701,14.DOI:10.11817/j.issn.1672-7207.2025.02.023
单轴压缩下充填体-围岩组合体力学特性与能量演化规律
Mechanical properties and energy evolution law of filling body-enclosed rock combination under uniaxial compression
摘要
Abstract
In order to study the mechanical properties and energy evolution law of gangue cemented backfill-surrounding rock combination,uniaxial compression tests were carried out on the combination specimens with different contact angles,and the mechanical properties,acoustic emission characteristics and energy evolution law of the failure process were analyzed.The results show that ductile failure occurs in the assemblies with contact angles of 0°,15° and 30°,and brittle failure occurs in the assemblies with contact angles of 45°,60°,75° and 90°.With the continuous increase of load,a large number of acoustic emission signals are generated at the peak stress of the assembly specimen.With the increase of contact angle,the proportion of tensile failure first increases and then decreases,and reaches the maximum when the contact angle is 45°.The elastic strain energy of the assembly specimens with different contact angles increases nonlinearly before the peak stress,and the slope of dissipation energy curve decreases gradually with the increase of contact angle.The curve evolution law of post-peak failure stage is related to the failure type of the assembly specimen.When ductile failure occurs,the elastic energy consumption ratio of the whole curve first decreases,and then turns to an upward trend at the peak stress.When brittle failure occurs,the elastic energy consumption ratio curve shows a downward trend as a whole and reaches the minimum value at the peak stress.The characteristics of acoustic emission and the law of energy evolution have a good correlation with the failure process of the assembly,which can provide effective precursor information for the failure prediction of the assembly.关键词
充填体-围岩组合体/矸石胶结充填体/声发射/能量演化/弹性能耗比Key words
fill-envelope assemblage/gangue cemented fill/acoustic emission/energy evolution/elastic energy consumption ratio分类
矿业与冶金引用本文复制引用
邱华富,李宇航,刘浪,梁超,丁自伟..单轴压缩下充填体-围岩组合体力学特性与能量演化规律[J].中南大学学报（自然科学版）,2025,56(2):688-701,14.基金项目
国家自然科学基金青年科学基金资助项目(51904225)(Project(51904225)supported by Youth Foundation of the National Natural Science Foundation of China) （51904225）
