岩土力学 ›› 2022, Vol. 43 ›› Issue (S2): 205-213.doi: 10.16285/j.rsm.2021.0092

• 基础理论与实验研究 • 上一篇    下一篇

混凝土含水裂隙中爆炸压力传播的模型试验研究

李桐1, 2，陈明1, 2，叶志伟1, 2，卢文波1, 2，魏东1, 2，郑祥3   

  1. 1. 武汉大学 水资源与水电工程科学国家重点试验室，湖北 武汉 430072；2. 武汉大学 水工岩石力学教育部重点试验室，湖北 武汉 430072； 3. 中国水利水电第七工程局有限公司 第一分局，四川 眉山 620010
  • 收稿日期:2021-01-13 修回日期:2021-04-15 出版日期:2022-10-10 发布日期:2022-10-03
  • 通讯作者: 陈明，男，1977年生，博士，教授，主要从事水利水电工程施工技术及岩石动力学方面的教学与研究工作。E-mail: whuchm@whu.edu.cn E-mail:whultong@whu.edu.cn
  • 作者简介:李桐，男，1993年生，博士研究生，主要从事水利水电工程施工技术及岩石动力学方面的研究工作。
  • 基金资助:
    国家自然科学基金项目（No.51979205，No.51939008）。

Model experimental study of explosion pressure propagation in concrete water-bearing crack

LI Tong1, 2, CHEN Ming1, 2, YE Zhi-wei1, 2, LU Wen-bo1, 2, WEI Dong1, 2, ZHENG Xiang3   

  1. 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China; 3. Branch No.1 of Sinohydro Bureau No.7 Co., Ltd., Meishan, Sichuan 620010, China
  • Received:2021-01-13 Revised:2021-04-15 Online:2022-10-10 Published:2022-10-03
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51979205, 51939008).

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摘要：

爆炸作用下含水裂隙中水压力的分布及传播特征对分析含水裂隙岩体初始裂纹扩展机制具有重要意义。通过含水裂隙的混凝土室内爆炸试验，测量了爆炸时含水裂隙中的水压力，分析了含水裂隙中水压力的荷载特性及传播特征，并研究了裂隙张开宽度及爆炸药量对水压力荷载的影响。试验研究结果表明：爆炸作用下含水裂隙中水压力时程分布呈多峰波动分布，水压力来源包括爆源通过水介质直接传递的荷载及通过混凝土间接传递的荷载，且在不同裂隙长度，荷载峰值主要来源不同；相同装药条件下，含水裂隙中水压力随距爆源距离增大而迅速衰减，裂隙中同一位置水压力大小与裂隙张开宽度呈负相关；混凝土室内爆炸试验含水裂隙中水击波所带能量频谱主要集中在7.8～62.5 kHz，是一种高频信号。随距爆源距离的增加，能量分布向低频集中；水击波频带能量分布特征受爆炸药量及裂隙张开宽度的影响。当量为4.5 g TNT（三硝基苯）乳化炸药装药相比 8.1 g TNT乳化炸药装药爆炸时水击波高频信息更丰富；相同爆炸药量时，随混凝土中含水裂隙张开宽度的增加，水击波频带能量分布峰值呈现向中间频带移动的趋势。

关键词: 爆炸试验, 含水裂隙, 水压力, 传播特征, 张开度, 能量分布

Abstract:

The distribution and propagation characteristics of water pressure in water-bearing crack under blasting load are of great significance to the study of the initial crack propagation mechanism in water-bearing fractured rock mass. Through the laboratory blasting experimental in concrete with water-bearing crack, the water pressure in water-bearing crack was measured during blasting, and its loading characteristics and propagation law were analyzed, while the effects of crack aperture and blasting charge quantity on water pressure were studied. The experimental results show that the time-history distribution of water pressure in water-bearing crack presents multi-peak fluctuation distribution. And the sources of water pressure include the blasting load directly transmitted through the water and indirectly transmitted through the concrete; the main source of load is different for different crack lengths. Under the same charging condition, the water pressure in water-bearing crack attenuates rapidly with increase of distance from the detonation source, and the water pressure at the same position in crack is approximately inversely proportional to the crack aperture. The energy spectrum of water hammer wave in water-bearing cracks is mainly concentrated in 7.8−62.5 kHz during laboratory explosion test of concrete with water-bearing crack, which is a high frequency signal. Meanwhile, the energy distribution trends to concentrate in the low frequency range with increase of distance from the detonation source. The energy distribution characteristics of water hammer wave are affected by charge and crack aperture, and the explosion induced by emulsion explosive of the equivalent 4.5 gTNT charge can generate water hammer wave with more abundant high frequency information in comparison with the equivalent 8.1 gTNT emulsion explosive charge. For the same blasting charge quantity, the peak energy distribution of the water hammer wave frequency band tends to move to the middle band with the increase of crack aperture.

Key words: explosion experiment, water-bearing crack, water pressure, propagation characteristic, aperture, energy distribution

中图分类号: O 383.1
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