CAJ | 학술논문

为明确最新研发的矿用U型约束混凝土拱架的基本力学性能，设计了U型约束混凝土(UCC)短柱轴压试验方案，从变形破坏形态、荷载-应变曲线、极限承载力及声发射响应特征等方面，分析了其受力性能和变形破坏特性，同时研究了核心混凝土破裂机理。结果表明：UCC短柱呈现整体塑性失稳的破坏形态，对应的N-ε曲线为上升→平缓上升的4阶段形式；UCC短柱具有较好的延性和后期承载能力，极限承载力提高127%~196%，经济性得到提高；声发射活动先后经历了孕育期到消寂期4个阶段。分析得到了每个时期约束混凝土短柱的受力、变形、破坏行为及机理。现场应用效果显示，U型约束混凝土拱架为深部、软岩巷道提供了新型有效的支护形式，控制效果明显优于常规U型钢拱架。
위명학최신연발적광용U형약속혼응토공가적기본역학성능，설계료U형약속혼응토(UCC)단주축압시험방안，종변형파배형태、하재-응변곡선、겁한승재력급성발사향응특정등방면，분석료기수력성능화변형파배특성，동시연구료핵심혼응토파렬궤리。결과표명：UCC단주정현정체소성실은적파배형태，대응적N-ε곡선위상승→평완상승적4계단형식；UCC단주구유교호적연성화후기승재능력，겁한승재력제고127%~196%，경제성득도제고；성발사활동선후경력료잉육기도소적기4개계단。분석득도료매개시기약속혼응토단주적수력、변형、파배행위급궤리。현장응용효과현시，U형약속혼응토공가위심부、연암항도제공료신형유효적지호형식，공제효과명현우우상규U형강공가。
In order to clarify the basic mechanical properties of the latest invented U-type confined concrete arch centering, the axial compression experiment program of U-type confined concrete (UCC) short columns is designed. And from the aspect of deformation and failure modes, load-strain curves, ultimate bearing capacity, core concrete response characteristics of the acoustic emission and so on, the mechanical behavior, deformation and failure character are analyzed, and the fracture mechanism of core concrete is researched. The study result shows that the failure modes of UCC short columns under the axial compression is in overall plastic instability, and the N-εcurve shows the rise→gent ly rise 4 stage type. UCC short columns have better ductility and post-bearing capacity, with the ultimate beating capacity increasing by 127%~196%. Accordingly, the economy improves. Acoustic emission activity shows 4 periods:incubation→active→stabilization→elimination death. At the same time the defo r-mation&failure behavior and mechanism of UCC short column are obtained by comprehensive analy-sis. The application effect shows that UCC arch centering is a new effective support for deep and soft rock roadway, and the surrounding rock controlling effect is much better than U-steel arch centering.