基于高压电脉冲破岩损伤模型的破岩过程研究

肖一标; 段隆臣; 李昌平; 康积锋; 李傲

doi:10.19509/j.cnki.dzkq.tb20210625

基于高压电脉冲破岩损伤模型的破岩过程研究

doi: 10.19509/j.cnki.dzkq.tb20210625

肖一标^1,,
段隆臣^2a,
李昌平^{2b, 2c, 3, ,},
康积锋^2a,
李傲^2a

1.
中国三峡建工 (集团)有限公司, 成都 610041
2a.
中国地质大学(武汉)工程学院, 武汉 430074
2b.
中国地质大学(武汉)机械与电子信息学院, 武汉 430074
2c.
中国地质大学(武汉)岩土钻掘与防护教育部工程研究中心, 武汉 430074
3.
长江大学油气钻采工程湖北省重点实验室, 武汉 434023

基金项目:

国家自然科学基金项目 42272366

岩土钻掘与防护教育部工程研究中心开放研究基金项目 202206

油气钻采工程湖北省重点实验室开放基金资助项目 YQZC202207

详细信息

作者简介:
肖一标(1996—), 男, 助理工程师, 主要从事水利水电工程管理方面的工作。E-mail: 572704430@qq.com

通讯作者:
李昌平(1990—), 男, 工程师, 主要从事高压电脉冲破岩钻头及地质装备研究工作。E-mail: lichangpingcug@126.com

中图分类号: P634
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- 文章访问数: 664
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- 被引次数: 0
出版历程
- 收稿日期: 2021-12-18

Study on the rock-breaking process based on a high-voltage electropulse boring damage model

Xiao Yibiao^1
,,
Duan Longchen^2a,
Li Changping^{2b, 2c, 3
, ,},
Kang Jifeng^2a,
Li Ao^2a

1.
China Three Gorges Construction Engineering Corporation, Chengdu 610041, China
2a.
Faculty of Engineering, Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China
2b.
School of Mechanical Engineering and Electronic Information, Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China
2c.
Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China
3.
Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas, Yangtze University, Wuhan 434023, China

摘要

摘要:
高压电脉冲破岩钻进是目前比较具有潜力和接近工业化的一种新型破岩钻进方式。已有的基于PFC2D的高压电脉冲破岩损伤模型未对破岩试验所用的岩石进行参数标定, 无法保证模拟的模型与实际破岩试验的岩石力学性质一致。基于室内单轴压缩和巴西劈裂试验的数据结果对天然岩石进行了参数标定, 通过标定所得的微观参数建立了与高压电脉冲破岩试验尺寸一致的几何模型, 并对高压电脉冲破岩过程进行了仿真研究。仿真结果表明高压电脉冲破岩过程中, 以产生剪切破坏为主, 同时伴随着一定数量的拉张破坏。之后, 利用高压电脉冲破岩试验系统进行了电脉冲破岩试验, 得到了直径60 mm、深度22.5 mm的不规则破碎孔, 并通过点云软件将破碎效果可视化, 放电破岩试验的结果验证了标定所得参数的有效性。最后, 通过标定参数建立的几何模型研究了裂隙对高压电脉冲破岩效果的影响, 结果表明裂隙的存在会降低破岩过程中的能量消耗, 且破碎过程中的破碎区域有向裂隙方向发展的趋势。
- 高压 /
- 电脉冲破岩 /
- 破岩过程 /
- PFC数值模拟 /
- 破岩试验
Abstract:
High-voltage electropulse boring (EPB) is a new drilling method with great potential for drilling and industrialization. The existing high-voltage electropulse boring damage model based on PFC2D does not calibrate the parameters of the rock used in the rock-breaking test, so it is impossible to ensure that the simulated model is consistent with the mechanical properties of the rock in the actual rock-breaking test. The parameters of natural rock were calibrated based on the data results of indoor uniaxial compression and Brazilian splitting tests. Based on the calibrated micro parameters, a geometric model consistent with the size of the high-voltage EPB test was established, and the EPB process was simulated. The simulation results indicated that the shear failure mainly occurred in the process of high-voltage EPB, accompanied by a certain amount of tensile failure. Then, the EPB test was carried out with the high-voltage EPB test system, and an irregular broken hole with a diameter of 60 mm and a depth of 22.5 mm was obtained. The breaking effect was visualized by point cloud software. The results of the EPB rock-breaking test verified the effectiveness of the calibrated parameters. Finally, the influence of the fractures on the rock-breaking effect of high-voltage EPB was studied through the geometric model established with the calibrated parameters. The results showed that the existence of fractures would reduce the energy consumption in the rock-breaking process, and the crushing area tended to develop in the direction of fractures.
- high-voltage /
- electropulse boring /
- rock-breaking process /
- PFC numerical simulation /
- rock-breaking test

HTML全文

图 1 各相介质与脉冲上升时间的关系

Figure 1. Relationship between different media and rising time of pulse voltage

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图 2 单轴压缩和巴西劈裂室内试验和模拟结果

a.室内单轴压缩试验; b.单轴压缩模拟结果; c.室内巴西劈裂试验; d.巴西劈裂模拟结果

Figure 2. Laboratory test and simulation results of uniaxial compression and Brazilian splitting

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图 3 室内试验及模拟所得的应力-应变曲线

Figure 3. Stress-strain curves obtained from laboratory tests and simulations

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图 4 高压电脉冲破岩损伤模型示意图

Figure 4. Schematic diagram for the damage model of a high-voltage electropulse boring(EPB)

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图 5 等效回路模型

1.液体绝缘介质; 2.岩石；C.储能电容；S.电路的转换开关；R_z.回路的自有电阻，包括电容器上的电阻、连接线上的电阻和电容器上的电阻、转换开关上的电阻；L.回路的电感，包括电容器上的电感、连接线上的电感和放电通道的电感；R_td.等离子体通道的阻抗；U₀.储能电容C上的电压

Figure 5. Equivalent circuit model

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图 6 冲击波曲线

a.滤波后的破碎红砂岩试验测得的电流曲线；b.冲击波曲线

Figure 6. Shock wave curve

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图 7 高压电脉冲破岩钻进红砂岩损伤几何模型

a.高压电脉冲破碎红砂岩表面损伤模型；b.高压电脉冲破碎红砂岩内部损伤模型

Figure 7. Damage geometric model of high-voltage EPB drilling of red sandstone

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图 8 高压电脉冲钻进红砂岩不同时刻的破碎效果

a.4 μs时红砂岩表面破碎效果；b.8 μs时红砂岩表面破碎效果；c.4 μs时红砂岩内部破碎效果；d.8 μs时红砂岩内部破碎效果

Figure 8. Crushing effect of high-voltage EPB drilling of red sandstone at different times

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图 9 高压电脉冲破岩表面及内部损伤模型的裂纹数量曲线

a.表面损伤模型；b.内部损伤模型；Ⅰ, Ⅱ, Ⅲ为冲击波破岩阶段的编号

Figure 9. Crack number curve of the surface and internal damage model of the high-voltage EPB

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图 10 高压电脉冲破岩试验系统

Figure 10. High-voltage EPB rock-breaking test system

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图 11 红砂岩破碎效果

Figure 11. Crushing effect of red sandstone

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图 12 裂隙位置示意图

Figure 12. Schematic diagram of fracture location

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图 13 裂隙影响下的颗粒位移云图

Figure 13. Cloud diagram of particle displacement under the influence of fracture

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表 1 标定所得微观参数组合

Table 1. Combination of microparameters obtained from calibration

颗粒刚度比k_n	颗粒接触模量E_n/GPa	法向黏结强度σ_c^*/MPa	摩擦系数μ	接触刚度比k^*
2.4	2.8	15.9	0.5	2.4

平衡黏结模量E^*/GPa		黏聚应力c^*/MPa	摩擦角φ/(°)	半径乘子λ
2.8		15.9	68	1

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表 2 室内试验及模拟所得宏观参数大小

Table 2. Macro parameters obtained from laboratory test and simulations

室内试验实测参数	ν	E/GPa	UCS/MPa	TS/MPa
大小	0.253	3.668	15.584	1.167

模拟所得宏观参数	泊松比ν^*	E^*/GPa	UCS^*/MPa	TS^*/MPa
大小	0.258	3.533	15.847	1.126
二者误差/%	1.976	3.821	1.688	3.641
注：ν为泊松比；E为弹性模量；UCS为单轴抗压强度；TS为抗拉强度

下载: 导出CSV

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