| 引用本文: |
孙善政，卢浩，陈昊，王德荣.爆炸作用下土中竖井结构荷载分布规律[J].陆军工程大学,2023,(1):18-27
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| 爆炸作用下土中竖井结构荷载分布规律 |
| 孙善政，卢浩，陈昊，王德荣 |
| (陆军工程大学 国防工程学院，江苏 南京 210007) |
| 摘要:为研究爆炸作用下非饱和黏土中竖井上荷载分布规律，开展了8组土中竖井受侧向爆炸作用模型试验及24组数值模拟计算。通过对比数值模拟与试验结果，验证了数值模拟计算合理性。根据试验及数值模拟计算结果，分析了竖井上荷载的时空分布规律，提出了能够合理描述荷载轴向、环向空间分布的预测公式。结果表明：(1) 荷载轴向上是钟形分布，并且随着装药距离的增加分布越发均匀，且可以认为荷载在一定轴向范围内是同时达到的；(2) 荷载环向呈现明显的时空不均匀性，侧压系数和背压系数都随着装药距离与结构直径比值的增大而增大；(3) 分别采用修正的正态分布曲线和三角函数曲线描述荷载的轴向和环向分布是合理的。预测公式可以用于竖井结构抗爆分析。 |
| 关键词: 爆炸荷载 荷载分布 竖井结构 圆柱壳 |
| DOI：10.12018/j .issn.2097-0730.20220505002 |
| 投稿时间：2022-05-05 |
| 基金项目:国家自然科学基金青年项目（51808552） |
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| Distribution of Explosion Load on Silo Structure in Soil |
| SUN Shanzheng，LU Hao，CHEN Hao，WANG Derong |
| (College of National Defense Engineering，Army Engineering University of PLA，Nanjing 210007，China) |
| Abstract: In order to study the load distribution of silos in unsaturated clay under the influence of explosion, 8 groups of model test and 24 groups of numerical simulation calculation of the silo structures in soil damaged by the lateral explosions were conducted. The rationality of the numerical simulation was verified by comparing the numerical simulations and experimental results. The spatial and temporal distribution of explosion load on the silo structures in soil was analyzed based on the experimental and numerical simulation results. The prediction formulas that can reasonably describe the axial and circumferential distribution of the explosion load were proposed. The following conclusions can be drawn. First, in the axial direction, the explosion load on the silo structure presents a bell-shaped distribution; the load distribution becomes more even with the increase of the charge distance; in a certain axial range, it can be assumed that the explosion load reaches the silo structure simultaneously. Second, the circumferential distribution of explosion load on the silo structure shows an obvious spatial and temporal uneven distribution, with the lateral pressure coefficient and the rear pressure coefficient rising with the increase of the ratio of the charging distance to the structure diameter. Last, it is reasonable to respectively use the modified normal distribution curve and the trigonometric function curve to describe the axial and circumferential distributions of the explosion load. The proposed prediction formulas can be applied to analysis of blast resistance of silo structures. |
| Key words: explosion load load distribution silo structure cylindrical shell |
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