Wang Ziyi, Jia Jinqing, Zhang Lihua
School of Civil Engineering, Dalian University of Technology, Dalian 116024, China.
Sensors (Basel). 2024 Aug 22;24(16):5448. doi: 10.3390/s24165448.
The use of a micropile group is an effective method for small and medium-sized slope management. However, there is limited research on the pile-soil interaction mechanism of micropile groups. Based on transparent soil and PIV technology, a test platform for the lateral load testing of slopes was constructed, and eight groups of transparent soil slope model experiments were performed. The changes in soil pressure and pile top displacement at the top of the piles during lateral loading were obtained. We scanned and photographed the slope, and obtained the deformation characteristics of the soil interior based on particle image velocimetry. A three-dimensional reconstruction program was developed to generate the displacement isosurface behind the pile. The impacts of various arrangement patterns and connecting beams on the deformation attributes and pile-soil interaction mechanism were explored, and the pile-soil interaction model of group piles was summarized. The results show that the front piles in a staggered arrangement bore more lateral thrust, and the distribution of soil pressure on each row of piles was more uniform. The connecting beams enhanced the overall stiffness of the pile group, reduced pile displacement, facilitated coordinated deformation of the pile group, and enhanced the anti-sliding effect of the pile-soil composite structure.
微型桩群的使用是中小型边坡治理的一种有效方法。然而，关于微型桩群的桩土相互作用机制的研究有限。基于透明土和粒子图像测速（PIV）技术，构建了一个边坡侧向加载试验平台，并进行了八组透明土边坡模型试验。获得了侧向加载过程中桩顶处的土压力和桩顶位移的变化。对边坡进行扫描和拍照，并基于粒子图像测速技术获得了土体内部的变形特征。开发了一个三维重建程序以生成桩后位移等值面。探讨了各种排列方式和连梁对变形特性和桩土相互作用机制的影响，并总结了群桩的桩土相互作用模型。结果表明，交错排列的前排桩承受更多的侧向推力，且每排桩上的土压力分布更均匀。连梁增强了桩群的整体刚度，减小了桩的位移，促进了桩群的协调变形，并增强了桩土复合结构的抗滑效果。
