饱和砂土中浅埋单药包爆炸效应研究

发布时间：2019-04-13 17:21

【摘要】：为探究饱和砂土场地中药包最佳埋设深度,基于室外大型爆炸试验场地,开展一系列饱和砂土中的浅埋单药包爆炸试验,分析超孔隙水压力变化规律及爆炸成坑效应。研究结果表明:实测孔隙水压力峰值和累积值均随爆距的增大而快速下降;药包埋深的增加有利于超孔隙水压力的累积及维持,相同比例距离处的超孔隙水压力比随着比例埋深的增加而有增大的趋势;超孔隙水压力比在比例距离半对数坐标中近似呈线性规律,其变化趋势与完全封闭爆炸时的基本一致,然而,较小的药包埋深使得部分爆炸能量直接通过自由面耗散,导致超孔隙水压力的上升比深埋爆炸时的明显减弱;相比湿砂环境,饱和砂土中爆坑周围的局部砂土有液化流动的趋势,使得爆坑的横向扩展更为剧烈,因此,在相同药量及埋深条件下,饱和砂土中的爆坑直径比湿砂中的更大。
[Abstract]:In order to explore the optimal buried depth of the medicine package in saturated sand field, a series of shallow buried single charge explosion tests in saturated sandy soil were carried out based on the outdoor large explosion test site, and the variation rule of ultra-pore water pressure and explosion pit-forming effect were analyzed. The results show that both the peak value and cumulative value of pore water pressure decrease rapidly with the increase of explosion distance. The increase of entrapment depth is beneficial to the accumulation and maintenance of excess pore water pressure, and the ratio of super pore water pressure at the same ratio has an increasing trend with the increase of the ratio of buried depth. The ultra-pore water pressure ratio is approximately linear in the semi-logarithmic coordinates of the proportional distance, and its variation trend is basically consistent with that of the completely enclosed explosion. However, some explosion energy is dissipated directly through the free surface because of the small depth of the entrapment of the charge. The rise of excess pore water pressure is much weaker than that of deep buried explosion. Compared with the wet sand environment, the local sand around the crater in saturated sand has the tendency of liquefaction flow, which makes the transverse expansion of the crater more severe. Therefore, the diameter of the crater in saturated sand is larger than that in wet sand under the same dosage and buried depth.
【作者单位】：武汉市市政建设集团有限公司;宁波市交通建设工程试验检测中心有限公司;河海大学土木与交通学院;中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金资助项目(51379067) 长江学者和创新团队发展计划项目(IRT1125)~~
【分类号】：TU441;TU751.9

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