Abstract Soil arching is an important phenomenon in the discussion on soil-structure interactions. Soil arching can increase the stresses exerted on a buried structure, while the absence of soil arching often results in differential surface settlement due to the difference in stiffness between the structure and the surrounding subsoil. In this investigation, model tests were conducted to relate the particle-scale responses of non-cohesive granular soils to the development of soil arching using spherical glass beads and two types of sandy soil. The trapdoor test apparatus, equipped with load cells, was used to measure both normal and shear stresses applied at the base. To explore the micromechanics of soil arching, complementary discrete element method simulations were performed using two types of particle shape: spherical particles and non-spherical particles, constituted by two adjoining spheres with a rigid connection. The results show that both sample height and particle shape play a vital role in arching behavior. Soil arching tends to develop as the ratio of the sample height to the width of the buried structure increases. The applied stresses on the buried structure are found to increase with increasing sample density and angularity of particle shape due to enhanced particle interlocking. Furthermore, the distribution of shear stress on the buried structure can be used to judge the presence or absence of a fully developed arch.

中文翻译：

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活板门条件下土壤拱起的粒子尺度洞察

摘要 土拱是土-结构相互作用讨论中的一个重要现象。土拱可以增加施加在埋地结构上的应力，而没有土拱通常会由于结构和周围底土之间的刚度差异而导致不同的表面沉降。在这项调查中，进行了模型试验，将非粘性颗粒土壤的颗粒尺度响应与使用球形玻璃珠和两种沙质土壤的土壤拱形的发展联系起来。装有称重传感器的活板门测试装置用于测量施加在底部的法向应力和剪切应力。为了探索土拱的微观力学，使用两种类型的颗粒形状进行了互补离散元方法模拟：球形颗粒和非球形颗粒，由两个相邻且刚性连接的球体构成。结果表明，样品高度和颗粒形状在拱形行为中都起着至关重要的作用。随着样品高度与埋藏结构宽度之比的增加，土拱趋于发展。由于增强的颗粒互锁，发现在埋入结构上施加的应力随着样品密度和颗粒形状棱角的增加而增加。此外，掩埋结构上的剪应力分布可用于判断是否存在完全发育的拱。随着样品高度与埋藏结构宽度之比的增加，土拱趋于发展。由于增强的颗粒互锁，发现在埋入结构上施加的应力随着样品密度和颗粒形状棱角的增加而增加。此外，掩埋结构上的剪应力分布可用于判断是否存在完全发育的拱。随着样品高度与埋藏结构宽度之比的增加，土拱趋于发展。由于增强的颗粒互锁，发现在埋入结构上施加的应力随着样品密度和颗粒形状棱角的增加而增加。此外，掩埋结构上的剪应力分布可用于判断是否存在完全发育的拱。