爆破扰动下邻近层状围岩隧道的稳定性与振速阈值

吴亮; 李凤; 卢文波; 陈明; 许锋

doi:10.11883/1001-1455(2017)02-0208-07

爆破扰动下邻近层状围岩隧道的稳定性与振速阈值

doi: 10.11883/1001-1455(2017)02-0208-07

吴亮^{1, 2,},
李凤^{1, 2, 4},
卢文波³,
陈明³,
许锋^{1, 2}

1.
武汉科技大学理学院，湖北武汉 430065
2.
中铁港航-武汉科技大学爆破技术研究中心，湖北武汉 430065
3.
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
4.
贵州新联爆破工程集团有限公司，贵州贵阳 550002

基金项目:

国家自然科学基金项目 51004079

国家自然科学基金项目 51479147

湖北省自然科学基金项目 2014CFB822

水利部科技推广计划项目 TG1522

详细信息

作者简介:
吴亮(1980-)，男，博士，副教授，wuliangwust@sina.com

中图分类号: O382.2
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- 被引次数: 0
出版历程
- 收稿日期: 2015-09-07
- 修回日期: 2015-11-18
- 刊出日期: 2017-03-25

Vibration velocity threshold of a tunnel adjacent to surrounding layered rocks under blasting load

Wu Liang^{1, 2
,},
Li Feng^{1, 2, 4},
Lu Wenbo³,
Chen Ming³,
Xu Feng^{1, 2}

1.
College of Science, Wuhan University of Science and Technology, Wuhan 430065, Hubei, China
2.
Blasting Technology Research Center, CRPCE-WUST, Wuhan 430065, Hubei, China
3.
State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China
4.
Guizhou Xinlian Blasting Engineering Group Co Ltd, Guiyang 550002, Guizhou, China

摘要

摘要: 爆炸荷载下邻近既有层状围岩隧道的迎爆侧易发生开裂、破坏，确保既有隧道围岩在爆破扰动下的安全是隧道近接施工中的关键问题。基于弹性力学和结构力学原理，建立了既有层状围岩隧道迎爆侧最危险点的简化力学模型，得到了最危险点的应力计算表达式，分析了隧道半径与岩层厚度的比值、岩层的倾角、岩层所对应的圆心角和隧道埋深等因素对既有隧道围岩稳定性的影响规律，并依据岩体最大拉应力判据确定了既有层状隧道围岩稳定的质点临界振动速度，结合地震波传播时的衰减规律，可以得出爆破施工时的最大单响药量，从而为隧道近接爆破动力扰动施工提供理论依据。
- 围岩稳定 /
- 爆破 /
- 隧道 /
- 层状围岩 /
- 振动速度
Abstract: Under a blasting load, the front side adjacent to blasting in an existing tunnel surrounded by layered rocks is apt to be destroyed, and therefore it is of critical importance to keep the tunnel safe from the destructive effects of the surrounding rocks cracks and damages that occur in a blasting disturbance. In this work, based on elastic mechanics and structural mechanics, we established a simplified mechanical model for the most dangerous point of the tunnel s blasting side, and obtained the stress formula that can calculate the stress at this point. We also analyzed the regular influence of such different factors as the ratio of the tunnel radius to the thickness of layer, the inclination angle, the central angle and depth of the surrounding layered rocks on the stress. In addition, using the theory of the maximum tensile stress, we calculated the surrounding rocks‘ critical vibration velocity that ensures the stability of the tunnel and obtained, according to the attenuation patterns of seismic wave propagation, the maximum charge of detonation for the construction of a new tunnel.
- stability of surrounding rock /
- blasting /
- tunnel /
- layered rock /
- vibration velocity

HTML全文

图 1 隧道层状围岩受力示意图

Figure 1. Force diagram of layered rock surrounding the tunnel

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图 2 梁的受力情况

Figure 2. Stress analysis of beam

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图 3 解除右侧约束后梁的受力

Figure 3. Stress after removing constraint of right side

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图 4 岩层厚度与岩梁正应力关系曲线

Figure 4. Stress vs. the thickness of rock layer

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图 5 岩层倾角与岩梁正应力关系曲线

Figure 5. Stress vs. the angle of rock layer

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图 6 隧道半径与岩梁正应力关系曲线

Figure 6. Stress vs. tunnel radius

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图 7 覆盖层厚度与岩梁正应力关系曲线

Figure 7. Stress vs. the thickness of covering layer

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图 8 层状围岩所对应夹角与应力关系曲线

Figure 8. Stress vs. the corresponding angle of rock layer

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图 9 隧道半径和层状厚度比与岩梁正应力关系曲线

Figure 9. Stress vs. the ratio of tunnel radius to thickness

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