有限长柱形药包土中爆腔特征尺寸的计算方法

李鹏毅; 王仲琦; 徐谦; 梁形形

doi:10.11883/bzycj-2018-0416

有限长柱形药包土中爆腔特征尺寸的计算方法

doi: 10.11883/bzycj-2018-0416

北京理工大学爆炸科学与技术国家重点实验室，北京 100081

基金项目: 国家科技重大专项(2016ZX05006-002)

详细信息

作者简介:
李鹏毅（1993－　），男，硕士研究生，2120160293@bit.edu.cn

通讯作者:
王仲琦（1972－　），男，博士，副教授，czqwang@bit.edu.cn

中图分类号: O381
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出版历程
- 收稿日期: 2018-10-22
- 修回日期: 2019-01-03
- 刊出日期: 2019-12-01

Calculation methods for characteristic sizes of blasting cavities induced by finite-length cylindrical charges in soil

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 为计算柱形药包土中爆腔尺寸，提出了一种有限长柱形药包在土中爆炸的特征尺寸近似计算方法，该方法利用球形药包爆腔膨胀准静态模型叠加的方式，给出了长径比较大情况下柱形药包爆腔特征尺寸及塑性区半径。与数值模拟对比表明，该方法的误差随长径比的增大而减小，当球形药包数量N=n、长径比在10及以上时，误差在12.2%以内，表明该方法能够较准确地预测有限长柱形药包爆腔的特征尺寸。
- 柱形药包 /
- 爆腔尺寸 /
- 塑性区 /
- 长径比
Abstract: In order to calculate the cavity sizes for the cylindrical charges in soil, a new method was established to calculate the characteristic cavity sizes for finite-length cylindrical charges in soil. In the new method, the quasi-static model for spherical charges is used to calculate the cavities induced by cylindrical charges. In this method, the characteristic cavity sizes and the plastic zones are calculated at the larger length-to-diameter ratio. The numerical simulation results show that the error decreases with the increase of the length-to-diameter ratio, when the number N of the spherical explosive packages is n and the length-to-diameter ratio is 10 or higher, the error is less than 12.2%. The results also show that the established method can accurately predict the characteristic sizes of the cavities induced by the finite-length cylindrical charge blasting.
- cylindrical charge /
- cavity size /
- plastic zone /
- length-to-diameter ratio

HTML全文

图 1 划分方式

Figure 1. Division methods

下载: 全尺寸图片幻灯片

图 2 不同N值的爆腔包络图(单位：mm)

Figure 2. Burst envelope diagrams at different N values (unit: mm)

下载: 全尺寸图片幻灯片

图 3 两种药包形成的爆腔特征尺寸图(深蓝色为爆腔区、浅蓝色为塑性区)

Figure 3. Characteristic dimensions of blasting zone formed by two kinds of charge(dark blue is the blasting zone and light blue is the plastic zone)

下载: 全尺寸图片幻灯片

图 4 不同药量、不同长径比情况下，爆腔特征尺寸理论计算结果与数值模拟结果的对比和相对误差分析

Figure 4. Comparison between theoretical calculation results and numerical simulation ones for characteristic dimensions of blasting chambers with different charge mass and different length-to-diameter ratios, and relative error analysis

下载: 全尺寸图片幻灯片

图 5 不同药量、不同长径比情况下，塑性区特征尺寸近似计算结果与数值模拟结果的对比以及相对误差分析

Figure 5. Comparisons between theoretical calculation results and numerical simulation ones for characteristic sizes of plastic zones at different charge mass and different length-to-diameter ratios, and relative error analysis (left)

下载: 全尺寸图片幻灯片

表 1 两种药包形成的爆腔特征尺寸

Table 1. Characteristic dimensions of blasting zones formed by two kinds of charge

划分方式	等体积球个数	半径/ mm	爆腔长半轴/ mm	爆腔短半轴/ mm	爆腔离心率	塑性区长半轴/ mm	塑性区短半轴/ mm	塑性区离心率
柱形		38.84	530	200	0.377 4	800	570	0.712 5
球形	8	47.89	500	190	0.380 0	790	560	0.708 9

下载: 导出CSV

表 2 不同计算方式爆腔特征尺寸计算结果

Table 2. Characteristic sizes of blasting cavity calculated by different calculation methods

计算方式	半径/mm	爆腔长半轴/mm	爆腔短半轴/mm	离心率
柱形模拟	38.84	530	200	0.377 4
8个球形替代模拟	47.89	500	190	0.380 0
一维柱形理论计算	38.84		215.7
8个球形叠加近似计算	47.89	524.7	189.5	0.361 2

下载: 导出CSV

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