滚石对棚洞结构的冲击动力分析

杨璐; 李士民; 吴智敏; 沈新普

doi:10.19818/j.cnki.1671-1637.2012.01.005

滚石对棚洞结构的冲击动力分析

doi: 10.19818/j.cnki.1671-1637.2012.01.005

杨璐^{1, 2,},
李士民²,
吴智敏¹,
沈新普²

1.
大连理工大学土木工程学院, 辽宁大连 116023
2.
沈阳工业大学建筑工程学院, 辽宁沈阳 110870

基金项目:

国家自然科学基金项目 11102118

国家自然科学基金项目 10872134

沈阳建筑大学结构工程重点实验室开放基金项目 JG-200919

辽宁省教育厅2010年度高等学校科研项目 L2010389

辽宁省“百千万人才工程”项目 2011921048

详细信息

作者简介:
杨璐(1973-), 女, 山东掖县人, 沈阳工业大学副教授, 工学博士, 博士后, 从事混凝土弹塑性损伤本构和数值模拟研究

中图分类号: U417.1
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出版历程
- 收稿日期: 2011-09-18
- 刊出日期: 2012-02-25

Dynamic analysis of rock-fall impact on shed tunnel structure

1.
School of Civil Engineering, Dalian University of Technology, Dalian 116023, Liaoning, China
2.
School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China

More Information

Author Bio:
YANG Lu(1973-), female, associate professor, PhD, +86-24-25417312, yanglu515@163.com

摘要

摘要: 以棚洞结构为原型, 对滚石冲击作用下棚洞的接触力、位移、损伤与能量进行了研究。将滚石简化为刚性球体, 围岩和土体为理想弹塑性材料, 混凝土为弹塑性材料, 通过ABAQUS有限元, 模拟了不同速度与冲击角度下滚石冲击荷载对棚洞结构的动力响应。分析结果表明: 在冲击角不变时, 滚石速度越大产生的位移越大, 在速度不变时, 滚石的冲击角越小产生的位移越大; 混凝土防护结构损伤最严重的地方发生在与滚石接触的区域, 其次在斜腿柱上端和同柱子连接的横梁处, 在实际工程中应加强柱子上端与横梁连接处的强度; 棚洞主要通过混凝土防护结构来吸收和消耗冲击能, 土垫层吸收和消耗冲击能很有限, 为了缓解滚石冲击对混凝土防护结构的破坏, 可在棚洞支座处增设耗能减震器。
- 棚洞结构 /
- 滚石 /
- 混凝土防护结构 /
- 冲击能 /
- ABAQUS有限元
Abstract: Shed tunnel structure was taken as prototype, and the contact force, displacement, damage, and energy of shed tunnel under rock-fall impact were studied.Rock-fall was simplified to rigid sphere, surrounding rock and soil were reduced to ideal elastic materials, and concrete was regarded as elastic-plastic material.The dynamic responses of rock-fall impact on shed tunnel structure at different speeds and incident angles were simulated by using ABAQUS finite element.Analysis result shows that when incident angle is unchanged, the greater rock-fall speed is, the greater the displacement is.When rock-fall speed is constant, the smaller rock-fall incident angle is, the greater the displacement is.The worst damage of concrete protective structure occurs at rock-fall contact area, the second damages are inclined leg pillar top and beam in connection with pillar, and the intensities of pillar top and beam joint should be strengthened in practical projects.Impact energy is mainly absorbed and consumed through the concrete protective structure of shed tunnel, the absorption and consumption of soil cushion layer are very limited.To alleviate the damage of rock-fall impact on the concrete protective structure, energy shock absorber can be added at shed tunnel bearing place.
- shed tunnel structure /
- roll-fall /
- concrete protective structure /
- impact energy /
- ABAQUS finite element

HTML全文

图 1 混凝土防护结构的计算模型

Figure 1. Calculation model of concrete protective structure

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图 2 岩石计算模型

Figure 2. Calculation model of rock

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图 3 土垫层计算模型

Figure 3. Calculation model of soil cushion layer

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图 4 棚洞结构的计算模型

Figure 4. Calculation model of shed tunnel structure

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图 5 冲击角为0°时位移和时间关系

Figure 5. Relationship between displacement and time when incident angle is 0°

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图 6 速度为20m·s^-1时位移和时间关系

Figure 6. Relationship between displacement and time when speed is 20m·s^-1

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图 7 混凝土防护结构弹坑形状

Figure 7. Impact crater shapes of concrete protective structure

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图 8 冲击角为0°时接触力和时间关系

Figure 8. Relationship between contact force and time when incident angle is 0°

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图 9 速度为20m·s^-1时接触力和时间关系

Figure 9. Relationship between contact force and time when speed is 20m·s^-1

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图 10 不同速度下位移载荷曲线

Figure 10. Displacement and load curves under different speeds

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图 11 不同冲击角下位移载荷曲线

Figure 11. Displacement and load curves under different incident angles

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图 12 棚洞混凝土区域损伤

Figure 12. Damage of shed tunnel concrete area

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图 13 棚洞混凝土区域横断面损伤

Figure 13. Cross-section damage of shed tunnel concrete area

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图 14 损伤与时间关系

Figure 14. Relationship between damage and time

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图 15 土垫层弹性应变能和时间关系

Figure 15. Relationship between time and elastic strain energy of soil cushion layer

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图 16 能量比和时间关系

Figure 16. Relationship among energy ratios and time

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图 17 能量和时间关系

Figure 17. Relationship among energies and time

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表 1 混凝土压缩硬化系数

Table 1. Concrete compression hardening coefficients

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表 2 混凝土拉伸硬化系数

Table 2. Concrete tension stiffening coefficients

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表 3 各能量之间关系

Table 3. Relationship among energies

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