不耦合装药爆破孔壁压力峰值的实验研究

叶志伟; 陈明; 魏东; 卢文波; 刘涛; 吴亮

doi:10.11883/bzycj-2020-0004

不耦合装药爆破孔壁压力峰值的实验研究

doi: 10.11883/bzycj-2020-0004

叶志伟^{1, 2,},
陈明^{1, 2, ,},
魏东^{1, 2},
卢文波^{1, 2},
刘涛^{1, 2},
吴亮³

1.
武汉大学水资源与水电工程科学国家重点实验室，湖北武汉 430072
2.
武汉大学水工岩石力学教育部重点实验室，湖北武汉 430072
3.
武汉科技大学理学院湖北省智能爆破技术研究中心，湖北武汉 430065

基金项目: 国家自然科学基金（51779193，51479147）；湖北省技术创新专项重大项目(2017ACA102)

详细信息

作者简介:
叶志伟（1994－　），男，博士研究生，whuyzw@whu.edu.cn

通讯作者:
陈　明（1977－　），男，博士，教授，博士生导师，whuchm@whu.edu.cn

中图分类号: O383
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-02
- 修回日期: 2020-12-07
- 网络出版日期: 2021-04-23
- 刊出日期: 2021-05-05

Experimental study on the peak pressure of borehole wall in decoupling charge blasting

YE Zhiwei^{1, 2
,},
CHEN Ming^{1, 2
, ,},
WEI Dong^{1, 2},
LU Wenbo^{1, 2},
LIU Tao^{1, 2},
WU Liang³

1.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China
2.
Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering Ministry of Education, Wuhan University, Wuhan 430072, Hubei, China
3.
Hubei Provincial Intelligent Blasting Technology Research Center, College of Science, Wuhan University of Science and Technology, Wuhan 430065, Hubei, China

摘要

摘要: 不耦合装药爆破孔壁压力峰值是控制岩体轮廓成形质量及进行非流固耦合爆破振动响应数值模拟分析的重要参数，本文采用实验方法研究了不耦合装药爆破的孔壁压力峰值：利用材质为20钢的无缝薄壁钢管模拟不耦合装药爆破炮孔，以高灵敏度、高精度的应变片为传感器，选用超动态应变仪采集钢管内置柱状炸药卷爆炸过程中钢管外壁产生的环向应变，应用动荷载作用下薄壁圆筒的动力响应计算方法，反演分析采集的钢管外壁环向应变数据，得到了爆破过程中空气冲击波作用于钢管内壁的冲击荷载压力峰值，间接测量了不耦合装药爆炸后的孔壁压力峰值。实验获得了6种不耦合装药工况下的爆破孔壁压力峰值测试数据，并计算了相应工况下实验值较准静态爆生气体压力的增大倍数，拟合结果表明压力增大倍数随不耦合系数的增大近似呈线性增长。同时也分析了部分试验工况下爆炸测试结果不理想的原因，研究成果可为轮廓爆破孔壁压力峰值的测试与计算提供参考。
- 不耦合装药 /
- 孔壁压力峰值 /
- 环向应变 /
- 动力响应
Abstract: The peak pressure of borehole wall in decoupling charge blasting is an important parameter to control the quality of rock mass profile forming and to carry out numerical simulation analysis of blasting vibration response of non-fluid-solid coupling. In this paper, the peak pressure of borehole wall in decoupling charge blasting was studied from an experimental perspective. Based on the characteristics that the difference between the two higher wave impedance media, steel pipe and rock, has little effect on the peak pressure of borehole wall, the seamless thin-walled steel pipe made of 20# steel was used to simulate the borehole in decoupling blasting with high-sensitivity-high-precision strain gauge as sensor, four strain gauges arranged along the circumferential direction of a certain section of each steel pipe. Ultrahigh dynamic strainometer was used to collect the circumferential strain of steel pipe during the explosion process of built-in columnar explosive cartridge; the method of calculating the dynamic response of thin-walled cylinder under dynamic load is used to calculate the collected circumferential strain; the elastic dynamic formula of the thin-walled cylinder was used to deduce the collected circumferential strain; and the peak pressure on the borehole wall by the air shock wave has been measured indirectly. The peak pressure on the borehole wall under six working conditions was obtained, and calculated the ratio of the experimental values to the quasi-static gas-pressure under the corresponding working conditions to obtain increase multiples. The decoupling coefficient was taken as the abscissa and the pressure increase multiple as the ordinate for the fitting, the fitting results indicate that the pressure increase multiples increase approximately linearly with the increase of the decoupling coefficients, and the fitting correlation coefficient is as high as 0.99 or more.At the same time, the reasons why the experimental results under some working conditions are unsatisfactory have been analyzed, which can be referred to the measurement and calculation of the peak pressure of borehole wall in contour blasting.
- decoupling charge /
- borehole peak pressure /
- circumferential strain /
- dynamic response

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图 1 应变片布置示意图

Figure 1. Schematic diagram of strain gauge arrangement

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图 2 钢管与炸药安置示意图

Figure 2. Schematic diagram of steel pipe and explosive placement

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图 3 爆炸罐内钢管安放

Figure 3. Steel pipe placement in an explosion tank

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图 4 测试流程示意图

Figure 4. Schematic diagram of test flow

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图 5 钢管鼓胀与撕裂

Figure 5. Steel pile bulging and tearing under the blasting effect

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图 6 应变片撕裂特征曲线

Figure 6. Strain gauge tearing characteristic curve

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图 7 第一批次实验不同工况环向应变典型时程曲线

Figure 7. Circumferential strain typical time history curve under different conditions of the first batch experiment

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图 8 第二批次实验不同工况环向应变典型时程曲线

Figure 8. Circumferential strain typical time history curve under different conditions of the second bath experiment

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图 9 压力增大倍数规律曲线

Figure 9. Regular curve of pressure increase factor

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表 1 第一批次实验工况

Table 1. First batch experimental cases

实验工况	钢管内径/mm	钢管外径/mm	数量/根	药卷直径/mm
F-EI-1	42	50	4	11、16、21、26
F-EI-2	50	60	4	11、16、21、26
F-EI-3	76	89	4	16、21、26、32
F-EI-4	90	102	4	16、21、26、32
F-EI-5	110	121	4	16、21、26、32

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表 2 第二批次实验工况

Table 2. Second batch experimental cases

实验工况	钢管内径/mm	钢管外径/mm	数量/根	药卷直径/mm
S-EI-1	72	88	3	16
S-EI-2	88	108	3	16
S-EI-3	88	108	4	21
S-EI-4	92	108	3	16
S-EI-5	107	121	3	16
S-EI-6	107	127	4	21

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表 3 第二批次实验不同工况钢管内壁压力峰值（单位：MPa）

Table 3. Peak pressure of steel pipe inner wall under different conditions in the second bath experiment (units: MPa)

实验工况	实验序号	通道a	通道b	通道c	通道d	平均值
S-EI-1 （72/16）	1	280.79	303.46	251.44	245.00	270.17
	2	261.73	346.04	231.87	214.72	263.59
	3	275.59	288.43	262.36	231.92	264.58
S-EI-2 （88/16）	4	180.54	231.37	224.38	197.95	208.56
S-EI-2 （88/16）	5	199.43	231.80	224.57	212.34	217.04
S-EI-3 （88/21）	6	损坏	277.69	259.54	287.26	274.83
S-EI-3 （88/21）	7	321.77	284.25	299.88	272.16	294.51
S-EI-4 （92/16）	8	188.27	211.06	200.80	187.87	197.00
S-EI-4 （92/16）	9	170.45	损坏	191.53	209.43	190.47
S-EI-5 （107/16）	10	156.42	173.19	163.86	损坏	164.49
	11	126.06	157.26	损坏	172.74	152.02
	12	143.53	146.93	158.72	171.28	155.12
S-EI-6 （107/21）	13	235.77	218.79	178.93	213.21	211.68
	14	230.38	237.75	252.18	264.05	246.09
	15	229.18	损坏	236.71	254.07	239.99
	16	294.95	208.28	255.38	220.31	244.73

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表 4 压力增大倍数

Table 4. Pressure increase factor

实验工况	不耦合系数	钢管内壁压力峰值/MPa	准静态压力/MPa	压力增大倍数
88/21 （S-EI-3）	4.19	284.67	17.44	16.32
72/16 （S-EI-1）	4.50	266.11	14.49	18.37
107/21 （S-EI-6）	5.10	235.62	10.49	22.46
88/16 （S-EI-2）	5.50	212.80	8.60	24.74
92/16 （S-EI-4）	5.75	193.74	7.66	25.29
107/16 （S-EI-5）	6.68	157.21	5.19	30.30

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