基于RHT本构的隧道爆破参数优化与振动损伤数值研究

汪大为; 王志亮; 汪书敏

doi:10.16030/j.cnki.issn.1000-3665.202210009

基于RHT本构的隧道爆破参数优化与振动损伤数值研究

doi: 10.16030/j.cnki.issn.1000-3665.202210009

合肥工业大学土木与水利工程学院, 安徽合肥　230009

基金项目: 国家自然科学基金项目（U1965101）；国家自然科学基金项目（12272119）

详细信息

作者简介:
汪大为（1998-），男，硕士研究生，从事岩石动力学研究。E-mail：DavidW0564335@163.com

通讯作者:
王志亮（1969-），男，博士，教授，博士生导师，主要从事岩石力学特性与损伤破坏机理研究。E-mail：cvewzL@hfut.edu.cn

中图分类号: U45
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- 被引次数: 0
出版历程
- 收稿日期: 2022-10-08
- 录用日期: 2023-09-06
- 修回日期: 2023-02-17
- 网络出版日期: 2023-10-31
- 刊出日期: 2023-11-15

Numerical study of tunnel blasting parameter optimization and vibration damage based on the RHT constitutive model

School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, Anhui　230009, China

摘要

摘要: 为了解决爆破参数优化问题以及考虑炮孔间相互作用对围岩损伤空间分布的影响，先利用数值试算与冲击试验相对照的方法，标定出大理岩Riedel-Hiermaier-Thoma本构模型参数。接着，对隧道全断面爆破开挖开展模拟计算，考察了多炮孔间相互作用下围岩爆破损伤演化过程。最后，基于起爆顺序、径向不耦合系数和分段间隔装药3种方法来优化爆破参数，并对质点振动和围岩损伤进行了深入分析。结果表明：标定所得的本构参数可准确描述大理岩动态应力-应变响应，且模拟结果能很好地揭示爆破损伤演化规律；岩石损伤从爆心处向外发展，随后在炮孔连线上连接贯通；相比于上述其他2种方法，当径向不耦合系数k小于1.33时，在保证爆破效果前提下改变k值能有效地降低围岩的爆破损伤；隧道竖向平均振动速度要大于水平向的对应值，且竖向拱顶和底板中部对爆破振动呈现较高的敏感性。研究结果为工程实践中爆破参数优化选取和围岩损伤精确评估等可提供参考。
- 大理岩 /
- 隧道爆破 /
- 参数优化 /
- 损伤演化 /
- 数值模拟
Abstract: To solve the optimization problem of blasting parameters and consider the influence of interaction between blastholes on the spatial distribution of surrounding rock damage, the Riedel-Hiermaier-Thoma constitutive model parameters of marble were first calibrated from numerical trial calculation and impact test. Then, the blasting excavation of a tunnel in full section was numerically simulated, and the evolution process of blasting damage of surrounding rocks under the interaction of multiple boreholes was investigated. Finally, the blasting parameters were optimized based on the three methods of initiation sequence, radial uncoupling coefficient and segmented interval charge, and the particle vibration and surrounding rock damage were further analyzed. The results show that the obtained constitutive parameters accurately describe the dynamic stress-strain response of the marble, and the simulated results can well reveal the evolution law of blasting damage. The rock damage develops outward from the blasthole center, and then the damage is connected and coalesced along the borehole connection line. Compared with the aforementioned other two methods, when the radial uncoupling coefficient k is less than 1.33, the blast damage of surrounding rock can be effectively reduced by changing the k value on the premise of ensuring the blasting effect. The average vibration velocity in the vertical direction of tunnel is greater than that in the horizontal direction, and the apex of arch and the middle of floor in this direction are more sensitive to blasting vibration. The research results in this study can provide reference for optimum selection of blasting parameters and accurate evaluation of surrounding rock damage in practical engineering.
- marble /
- tunnel blasting /
- parameter optimization /
- damage evolution /
- numerical simulation

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图 1 SHPB装置

Figure 1. SHPB device

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图 2 试样应力-应变曲线

Figure 2. Stress-strain curves of rock samples

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图 3 试样的破坏形态对比

Figure 3. Comparision of failure mode of sample

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图 4 炮孔布置（单位：cm）

Figure 4. Arrangement of blast holes (unit: cm)

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图 5 数值模型及网格划分

Figure 5. Numerical modeling and meshing

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图 6 正常起爆下不同时刻爆破损伤

Figure 6. Blasting damage at different timea under normal initiation

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图 7 预裂爆破损伤

Figure 7. Blasting damage of pre-split blasting

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图 8 不同耦合系数爆破损伤

Figure 8. Blasting damage with different coupling coefficients

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图 9 装药结构分类

Figure 9. Classification of charge structure

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图 10 不同装药结构爆破损伤

Figure 10. Blasting damage of different charging structures

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图 11 代表性监测点

Figure 11. Representative monitoring points

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图 12 不同位置的合速度时间曲线

Figure 12. Changes of velocity with time at different positions

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图 13 速度峰值空间分布图

Figure 13. Spatial distribution of the peak velocity

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表 1 锦屏大理岩RHT模型参数

Table 1. RHT model parameters of the Jinping marble

参数	取值	参数	取值	参数	取值
ρ₀ /（kg·m⁻³）	2812	F_t^*	0.10	P_crush /MPa	87
G /GPa	16.9	F_s^*	0.19	G_c^*	0.8
f_c /MPa	130	A₁ /GPa	30.42	G_t^*	0.7
N	0.615	A₂ /GPa	51.47	XI	0.7
β_t	0.0133	A₃ /GPa	31.46	D₁	0.04
B₀	0.9	Q₀	0.7	D₂	1
B₁	0.9	B	0.0105	β_c	0.0097
α₀	1.0	EOC /（s⁻¹）	3.0E-5	A_f	1.3
T₁ /GPa	30.42	EOT /（s⁻¹）	3.0E-6	N_f	0.7
P_lock /GPa	8	A	2.34	N_p	3

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表 2 炸药JWL方程参数

Table 2. JWL equation of state parameters of explosive

参数	A_J /GPa	B_J /GPa	R₁	R₂	ɷ	P_J /GPa	E_J /GPa
取值	625	23.3	5.25	1.6	0.28	22	8.56

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