顶爆和拱腰侧爆同时作用下锚固洞室的动态响应

王光勇; 曹安生; 余锐; 林加剑

doi:10.11858/gywlxb.20190812

顶爆和拱腰侧爆同时作用下锚固洞室的动态响应

doi: 10.11858/gywlxb.20190812

1.
河南理工大学土木工程学院，河南焦作　454000
2.
安徽大学电气工程与自动化学院，安徽合肥　230601

基金项目: 国家自然科学基金-山西煤基低碳联合基金重点项目（U1810203）

详细信息

作者简介:
王光勇（1977－），男，博士，副教授，主要从事岩土工程动载试验研究.E-mail: wgy2003@mail.ustc.edu.cn

中图分类号: O383.2; TU457
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出版历程
- 收稿日期: 2019-07-16
- 修回日期: 2019-09-03
- 发布日期: 2019-11-25

Dynamic Response of Anchorage Chamber under Simultaneous Explosion Load from Top and Side of Arch

1.
School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China
2.
College of Electrical Engineering and Automation, Anhui University, Hefei 230601, Anhui, China

摘要

摘要: 基于相似模型试验，采用显式非线性动力分析程序LS-DYNA3D研究了地下锚固洞室在拱顶和拱腰侧两处集中装药爆源同时爆炸作用下应力波传播规律、裂纹形成机理以及洞壁围岩位移分布特征。通过对比分析顶爆试验和计算模型的压应力时程曲线，发现模拟与试验结果吻合，且符合应力波的传播规律，表明数值模拟结果可靠。爆源爆炸后，应力波以圆形向周围岩体传播，两应力波相遇处压应力强度明显大于周围岩体；当应力波传到自由面时，会反射形成拉伸波，在地表下方和洞室上方发生“层裂”现象，在拱顶和拱腰侧爆源中间沿洞室径向有裂纹延伸，由于拉伸波的叠加，在爆源下方出现“八”字形的锥形裂纹面。锚杆能够起到加固岩体的作用，锚固洞室比毛洞裂纹分布少，毛洞迎爆侧裂纹主要为横向裂纹，而锚固洞室则为径向劈裂和横向裂纹。两爆源中点洞室径向处的洞壁围岩位移峰值最大，极易产生破坏。
- 地下防护工程 /
- 锚固洞室 /
- 双爆源 /
- 动态响应 /
- 同时起爆 /
- 数值分析
Abstract: Based on the similar model test, the stress wave propagation rule, crack formation mechanism and displacement distribution characteristics of rock mass in the underground anchorage chamber under the simultaneous explosion of concentrated explosive source at top and side of arch are studied by explicit nonlinear dynamic analysis program LS-DYNA3D. By comparing and analyzing the compressive stress time-history curves of the experimental and calculation model, it is found that the simulation results are consistent with the experimental results and conform to the stress wave propagation law, which indicates that the numerical simulation results are reliable. Under explosion of the source, the stress wave propagates to the surrounding rock mass in a circular way. When the stress wave is transmitted to the free surface, it will be reflected and form the stretching wave, which forms the phenomenon of “spalling crack” under the ground and above the tunnel. There are cracks extending along the radial direction of the chamber at the middle point of the explosion source on the top and side of arch. The bolt can play a role in strengthening the rock mass. The distribution of cracks in the anchorage chamber is less than that in the unanchored chamber. The displacement peak value of the surrounding rock at the radial axes of the two blasting sources is the largest and most easily destroyed.
- underground protection engineering /
- anchorage chamber /
- double explosive source /
- dynamic response /
- simultaneous detonation /
- numerical analysis

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图 1 数值计算模型（单位: cm）

Figure 1. Model of numerical analysis (Unit: cm)

下载: 全尺寸图片幻灯片

图 2 模拟与实验岩体单元压应力时程曲线对比

Figure 2. Comparison of pressure curves of rock elements between numerical and experimental results

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图 3 应力波传播过程

Figure 3. Process of stress wave propagation

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图 4 单爆源作用下锚固洞室岩体单元压应力时程曲线

Figure 4. Time history curve of compressive stress of rock elements from anchorage chamber under single explosion

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图 5 拱顶和拱腰侧爆源同时起爆锚固洞室岩体单元压应力时程曲线

Figure 5. Time history curve of compressive stress of rock elements from anchorage chamber under explosion load from top and side of arch

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图 6 围岩裂纹分布情况

Figure 6. Crack distributions of surrounding rock

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图 7 洞壁位移（单位: mm）

Figure 7. Displacement of the cavern (Unit: mm)

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表 1 数值计算模型的材料参数^[18]

Table 1. Material parameters for the analysis model^[18]

Rock TNT Rock bolt
G/GPa K/GPa p_CJ/GPa D_H/（m·s^–1） A/GPa B/GPa R₁ R₂ ω E₀/GPa E/GPa μ

0.856 0.958 27 6 930 371 7.43 4.15 0.95 0.3 7 76 0.34

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