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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.
The numerical simulation method is used to study the reinforcement effect of the bulkhead under dynamic load. The three-dimensional numerical model of the bulkhead is established by using the random discontinuous deformation method. The horizontal dynamic load is applied to the specimen, The macroscopic and meso-mechanical properties of bulk material under dynamic load were analyzed.Separation of different sizes of anchor, particle size and the sample without bulkhead were studied respectively, The numerical simulation results show that the random discontinuous deformation of granular materials can study the deformation and reinforcement effect of the granular materials under dynamic load, and the reinforcement by the anchors can effectively limit the deformation of the granular material under dynamic conditions Improve the bulk of the bulk; same as static load, due to the extrusion of the anchor to produce lateral pressure on the bulk particles to strengthen the contact force between the particles; the same length of anchor, the anchor density The better the seismic stability of the large and the bulk samples is. When the ratio of the bolt spacing to the average size of the bulk particles is less than 2.35, the anchor rod can well improve the self-stability of the bulk structure while maintaining the overall stability .