自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第48卷    第11期    总第279期    2017年11月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2017)11-3023-07
饱和砂土中浅埋单药包爆炸效应研究
谢先启1,王维国2,贾永胜1,陈育民3,孙金山4

(1. 武汉市市政建设集团有限公司,湖北 武汉,430023; 2. 宁波市交通建设工程试验检测中心有限公司,浙江 宁波,315124; 3. 河海大学 土木与交通学院,江苏 南京,210098; 4. 中国地质大学(武汉) 工程学院,湖北 武汉,430074)

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。

 

关键字: 饱和砂土;浅埋单药包;孔隙水压力;爆坑

Study of blast response induced by single shallow-buried detonations in saturated sand
XIE Xianqi1, WANG Weiguo2, JIA Yongsheng1, CHEN Yumin3, SUN Jinshan4

1. Wuhan Municipal Construction Group Co. Ltd., Wuhan 430023, China; 2. Ningbo Traffic Construction Project Testing and Inspection Center Co. Ltd., Ningbo 315124, China; 3. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China; 4. Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China

Abstract:To study the optimal burial depth for explosive charges in saturated sand, series of single shallow-buried detonation tests were conducted at a large-scale field site and crater formations and excess porewater pressure generations were investigated. The results show that both the peak and accumulative values of porewater pressure decrease with the increase of the blast distance. The accumulation and duration for the maximum constant level of porewater pressure are promoted with the increase of the charge’s burial depth. For a given scaled distance, a deeper burial explosion can generate a higher porewater pressure. Approximate linear fitting between the recorded excess porewater pressure ratio and the scaled distance is observed in a semi-logarithmic scale. The liquefaction tendencies showed by the fitting lines are basically in accordance with the results produced by a fully contained detonation. However, smaller growing of porewater pressure is recorded during the tests with shallow-buried charge, since a portion of explosion energy dissipates through the ground surface. Saturated soil particles near a crater have liquefied tendencies under blast loading, which leads to a more intense horizontal expansion of a crater compared with that in wet sand. Therefore, crater diameter in saturated sand is much larger than that in wet sand under the same blast loading and buried depth.

 

Key words: saturated sand; single shallow-buried charge; porewater pressure; blast-induced crater

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号