高性能纤维喷射混凝土单层衬砌在分层施工过程中内部能量演化过程与机制尚不明晰,为研究分层施工对单层衬砌结构能量演化特性的影响,开展了6种厚度比λh(第二层与第一层纤维喷射混凝土的厚度比)试件的单轴压缩强度试验。结果表明:纤维喷射混凝土的单轴压缩强度受厚度比影响较大,当厚度比为1时峰值强度达到最大值43.32 MPa,应力分布最优;厚度比大于4时,因第一层过薄会引发脱粘、压溃现象;在单轴压缩过程中,试件总输入能随厚度比增大而提高,弹性能储存能力在厚度比为1时最优,而耗散能在厚度比为5时呈现剧烈波动,反映局部失稳引发的集中能量释放;基于耗能系数分析,压实阶段能量耗散率降低,表明结构稳定性显著降低。
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