动力荷载下散粒体的锚杆加固效应

发布时间：2019-01-11 07:25

【摘要】：采用细观数值模拟方法研究动力荷载下散粒体的锚杆加固效应,采用随机散粒体不连续变形方法建立加锚散粒体的三维数值试样,对试样施加水平方向的动力荷载,分析散粒体材料在动力荷载条件下的宏观和细观力学特性.分别建立不同锚杆间距、颗粒粒径以及无锚杆的散粒体试样,研究其对动力荷载条件下的散粒体的力学性质影响.数值模拟结果表明:随机散粒体不连续变形方法可以研究动力荷载下散粒体的变形规律及加固效应;锚杆加固可以有效限制散粒体在动力情况下的变形,显著提高散粒体的整体性;与静力加载相同,由于锚杆的挤压使散粒体产生侧向压力,加强了颗粒间的接触作用力;锚杆长度相同的情况下,加锚密度越大,散粒体试样的抗震稳定性越好;当锚杆间距与散粒体平均粒径的比值小于2.35时,锚杆可以很好地提高散粒体结构的自稳能力而保持整体稳定.
[Abstract]:A mesoscopic numerical simulation method is used to study the bolting reinforcement effect of a granular mass under dynamic loading. A three-dimensional numerical specimen with an anchor particle is established by the method of random discontinuous deformation of the granular body, and the dynamic load in the horizontal direction is applied to the specimen. The macroscopic and meso-mechanical properties of granular materials under dynamic loading are analyzed. The effects of different bolting spacing, particle size and non-bolt particle size on the mechanical properties of the bolted body under dynamic loading were studied. The numerical simulation results show that the random discontinuous deformation method can be used to study the deformation law and reinforcement effect of the granular body under dynamic load. Anchor reinforcement can effectively limit the deformation of the granular under the dynamic condition, and improve the integrity of the granular significantly, which is the same as the static loading, because of the lateral pressure caused by the compression of the anchor rod, the contact force between the particles is strengthened. When the length of anchor rod is the same, the larger the anchor density is, the better the seismic stability of the granular sample is. When the ratio of bolt spacing to average particle size is less than 2.35, the anchor rod can improve the self-stability of granular structure and keep the whole stability.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家自然科学基金项目(编号:51379161);国家自然科学基金优秀青年科学基金项目(编号:51322905)
【分类号】：TU476

【相似文献】