针对高地应力下软岩隧道变形显著、缺少高吸能隧道缓冲层材料的工程问题，以水性环氧树脂与乳化沥青为胶结基材、以发泡聚苯乙烯（EPS）颗粒为吸能骨料，研发出满足隧道缓冲层功能需求的高吸能混凝土。分析压缩荷载下高吸能混凝土的力学性能，结合CT扫描与三维重构技术分析高吸能混凝土的吸能机制。结果表明： 1）压缩荷载下高吸能混凝土的应力-应变曲线呈现弹性、平台、强化、破坏4个阶段的发展特点，平台应力为1.189~1.624 MPa，弹性模量为17.89~24.50 MPa，最大极限压应变为0.6； 2）多阶段的吸能特征使高吸能混凝土具有良好的吸能性能，最大单位体积吸能达到0.84 J/cm³，其中平台吸能阶段吸能占比最大； 3）CT扫描结果表明，高吸能混凝土中EPS颗粒在密实变形及其连通性的发展主导其变形吸能性能，机制砂颗粒相互搭接形成的骨架结构也使其力学性能有显著提升； 4）建立基于Gibson-Ashby多孔介质模型的细观变形单元，获得压缩荷载下高吸能混凝土力学本构模型。

Owing to a lack of high-energy-absorbing buffer materials, deformation of soft rock tunnels under high ground stress is severe. Therefore, a high-energy-absorbing concrete was developed using waterborne epoxy resin and emulsified asphalt as the binder material and expanded polystyrene (EPS) particles as the energy-absorbing aggregate, meeting the functional requirements of the buffer layer. The mechanical properties of this concrete under uniaxial compression were experimentally examined, and its energy absorption mechanism was elucidated through computed tomography (CT) scanning and three-dimensional reconstruction. The main findings are as follows: (1) The stressstrain curves exhibit elastic, plateau, densification, and failure stages. The plateau stress ranges from 1.189 to 1.624 MPa, the elastic modulus ranges from 17.89 to 24.50 MPa, and the ultimate compressive strain reaches 0.6. (2) The multistage energy absorption characteristics result in effective energy absorption performance of the concrete, with a maximum energy absorption per unit volume of 0.84 J/cm³, among which the plateau stage exhibits the largest proportion of energy absorption. (3) CT scanning results reveal that the deformation and energy absorption performance of the concrete are primarily determined by the densification deformation and connectivity development of EPS particles, and the skeleton structure formed by manufactured sand particles substantially improves its mechanical properties. (4) A mesoscopic deformation element based on the Gibson-Ashby porous medium model under uniaxial compression was established, and a mechanical constitutive model for the concrete was obtained.