滚石冲击棚洞砂土垫层物理模型试验及数值模拟研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (18) : 195-202.

论文

王东坡1，周良坤1，裴向军1，黄畇坤1，刘兴荣2

作者信息 +

Experimental and numerical study on rockfall impacts on sand-soil cushions

WANG Dongpo1,ZHOU Liangkun1,PEI Xiangjun1,HUANG Yunkun1,LIU Xingrong2

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文章历史 +

摘要

滚石冲击棚洞垫层的动力响应分析多采用数值模拟手段，缺乏物理模型试验验证。为此，以山区棚洞结构为原型，搭建滚石冲击棚洞结构试验平台，开展不同坠落高度下不同垫层厚度及密度的冲击试验，并建立对应的数值模型。进一步通过与试验结果比对，验证数值模型的可靠性，在此基础上开展滚石冲击棚洞垫层动力响应数值计算分析，结果表明：松散砂土垫层比密实砂土垫层具有更好的耗能效果；增大垫层厚度能够延长冲击持续时间，有效降低滚石冲击力，但随着厚度不断增加，其缓冲能力的提升程度减缓；通过对Hertz接触理论、日本公式、动力有限元三种方法比较，发现前两种方法的计算结果明显偏大，偏于保守。研究成果可为棚洞结构砂土垫层的设计提供理论与技术支持。

Abstract

The dynamic process analysis of the rock-fall impact to rock-shed cushion is mostly based on numerical simulation and lacks model test verification. Therefore, based on the prototype of rock-shed structures, the test platform of the rock-shed under rock-fall impact was built. The impact test of different cushion thicknesses and densities under different fall heights was carried out, and the corresponding numerical model was established. The reliability of the numerical model was verified by comparison with the experimental results. And the dynamic response analysis of the cushion was carried out. The results show that the loose sandy cushion has better energy absorption efficiency. Increasing the thickness of the cushion can prolong the impact duration and effectively reduce the impact force. However, as the thickness increasing, the improvement of cushioning effect is slowed down. Furthermore, by comparing the Hertz contact theory, the Japanese formula, and the dynamic finite element method, the calculation results of the first two methods are obviously larger. The research results can provide theoretical and technical support for the design of sandy cushion of rock-shed.

导出引用

王东坡1，周良坤1，裴向军1，黄畇坤1，刘兴荣2. 滚石冲击棚洞砂土垫层物理模型试验及数值模拟研究[J]. 振动与冲击, 2020, 39(18): 195-202

WANG Dongpo1,ZHOU Liangkun1,PEI Xiangjun1,HUANG Yunkun1,LIU Xingrong2. Experimental and numerical study on rockfall impacts on sand-soil cushions[J]. Journal of Vibration and Shock, 2020, 39(18): 195-202

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