砂土中压力分散型锚索锚固机理研究

Anchorage Mechanism of Pressure Dispersed Anchor Cable in Sand

岩土锚固机理的研究在很大程度上依赖于对材料细观力学特性的分析。通过室内模型试验和数字图像变形测量技术,分析了不同砂土密实度、锚杆埋深、锚片间距及锚片数量下的压力分散型锚杆上拔过程中上拔力-位移关系曲线特征,并从细观角度分析了压力分散型锚杆在不同工况下的锚周土体变形和破坏机制。以颗粒流理论为基础,建立了压力分散锚杆锚固性能的颗粒流数值模拟模型。通过数值模型试验,分析了压力分散锚杆在荷载作用下砂粒的细观力学特性,如应力、位移和孔隙率。通过与室内模型试验结果相对比,验证了数值模拟的正确性,并通过对锚杆埋置深度、砂土密实度等因素的分析,探讨了影响压力分散锚杆锚固性能的一些因素。

The study of geotechnical anchorage mechanism largely depends on the analysis of meso mechanical properties of materials.Through indoor model test and digital image deformation measurement technology,the characteristics of uplift force displacement relationship curve of pressure dispersed anchor under different sand compactness,anchor burial depth,anchor spacing and anchor number were analyzed,and the deformation and failure mechanism of soil around the anchor under different working conditions were analyzed from the meso point of view.Based on the particle flow theory,a particle flow numerical simulation model for the anchorage performance of pressure dispersed bolt was established.Through numerical model test,the micromechanical characteristics of sand particles under load,such as stress,displacement and porosity were analyzed.Compared with the indoor model test results,the correctness of the numerical simulation was verified.Through the analysis of the factors such as the embedded depth of the bolt and the compactness of the sand,some factors affecting the anchorage performance of the pressure dispersed bolt were discussed.