冲击荷载下颗粒级配对废弃混凝土骨料垫层缓冲机理影响研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (9) : 18-26.

论文

苏宇宸1，李鹏飞1，仲恒1，吴琳1，王媛2，吕亚茹1

作者信息 +

Effects of particle-size distribution on buffering mechanism of waste concrete aggregate cushion layer under impact load

SU Yuchen1, LI Pengfei1, ZHONG Heng1, WU Lin1, WANG Yuan2, LYaru1

Author information +

文章历史 +

摘要

在棚洞等防护结构上方铺设散体材料垫层能够大幅削减落石冲击力和棚洞顶板传递力，提高防护结构抗冲击性能。为了研究颗粒级配对新型废弃混凝土骨料垫层缓冲性能的影响规律，分别开展室内落锤冲击试验和三维离散元数值模拟。结果表明，对于单一粒组颗粒垫层，当均一化颗粒粒径（d50/R）由0.15增加至0.75时，由于力链中潜在失稳点减少，力链稳定性增强，颗粒重排机制受限（平均位移和转角分别减少了41.3%和33.7%），导致落锤冲击力和棚洞顶板传递力峰值分别增加了36.3%和282.2%；对于复合粒组颗粒垫层，当不均匀系数（Cu）由1.1增加至8.0时，粗颗粒周围孔隙被细颗粒填充，配位数增加，导致力链稳定性增强，颗粒重排机制受限（平均位移和转角分别减少了22.4%和45.3%），落锤冲击力和棚洞顶板传递力峰值分别增加了26.0%和174.6%；基于试验和数值模拟结果提出与均一化粒径（d50/R）和不均匀系数（Cu）相关的垫层防护折减系数 ，建立考虑垫层防护作用的落锤冲击力半经验公式，为山区棚洞工程设计与施工提供技术支撑和理论指导。

Abstract

Granular cushioning layer installed at top of concrete shed can effectively reduce boulder impact force and transmitted load. To study the effects of particle-size distribution on cushioning performance of waste concrete aggregate cushion, boulder impact tests and three-dimensional discrete-element-numerical simulations were carried out. The results show that for cushioning layer with same particle size, when normalized particle size (d50/R) increases from 0.15 to 0.75. Due to reduction of potential points of failure in shorter force chains, the force chains stability increases. It further limits the particle rearrangement mechanism (average particle movements and rotation angles are reduced by 41.3 % and 33.7 %, respectively) during boulder impact. The peak values of the boulder impact force and transmitted load increased by 36.3% and 282.2%, respectively. For composite particles group, when non-uniformity coefficient (Cu) increases from 1.1 to 8.0, the porosity around coarse particles were filled with finer particles, the coordination number increases and force chain stability was enhanced (average translation distance and rotation angle were reduced by 22.4% and 45.3%), The peak values of boulder impact force and transmitted load increased by 26.0% and 174.6%, respectively, the cushioning performance of cushion decreased. Based on the experimental and numerical simulation results, a cushion reduction coefficient α related to the median of uniform particle size (d50/R) and non-uniformity coefficient (Cu), and the semi-empirical formula of drop hammer impact force considering protective effect of cushion was established. It may further provide technical and theoretical guidance for mountain shed tunnel engineering design.

导出引用

苏宇宸1，李鹏飞1，仲恒1，吴琳1，王媛2，吕亚茹1. 冲击荷载下颗粒级配对废弃混凝土骨料垫层缓冲机理影响研究[J]. 振动与冲击, 2024, 43(9): 18-26

SU Yuchen1, LI Pengfei1, ZHONG Heng1, WU Lin1, WANG Yuan2, LYaru1. Effects of particle-size distribution on buffering mechanism of waste concrete aggregate cushion layer under impact load[J]. Journal of Vibration and Shock, 2024, 43(9): 18-26

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