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应用双轴压缩试验设备对棱柱状颗粒材料进行了轴向加载、卸载和再加载应力路径试验,观察到在不同侧向应力状态下棱柱状颗粒材料在轴向加卸载过程中开裂破损并逐渐形成破损带的过程。当侧向应力较低时,颗粒材料试样的变形主要来自颗粒的错动和破裂;且随着竖向应变的增加,试样体积先压缩后膨胀;加载初期侧向稍有收缩,随后侧向则一直膨胀。当侧向应力较高时,颗粒材料试样的变形主要来自颗粒间压缩、颗粒的压缩和压碎;且随着竖向应变的增加,体积一直收缩,侧向应力越大,体积收缩的越多;侧向则一直压缩。卸载-再加载轴向应力循环中,低侧向应力时可恢复应变较大,高侧向应力时可恢复性应变较小。
The axial loading, unloading and reloading stress path tests on prismatic granular materials were carried out by using the biaxial compression test equipment. It was observed that the prismatic granular materials were cracked and gradually formed during axial loading and unloading under different lateral stress conditions Damaged belt process. When the lateral stress is low, the deformation of the granular material sample mainly comes from the dislocation and rupture of the particles. With the increase of the vertical strain, the sample volume expands first and then expands slightly. At the initial stage of loading, To the expansion has been. When the lateral stress is high, the deformation of the sample of the granular material mainly comes from the compression between the particles, the compression and the crushing of the particles; and as the vertical strain increases, the volume shrinks all the time; the larger the lateral stress is, the more the volume contraction More; lateral compression has been. During unloading-reloading axial stress cycles, the recoverable strain is high at low lateral stress and recoverable at high lateral stress.