深埋洞室围岩参数劣化的试验与数值模拟研究

杨朝帅; 李达强

doi:10.20265/j.cnki.issn.1007-2993.2023-0906

深埋洞室围岩参数劣化的试验与数值模拟研究

doi: 10.20265/j.cnki.issn.1007-2993.2023-0906

杨朝帅^{1, 2, 3,},
李达强^{1, 2, 3}

1.
中铁隧道局集团有限公司，广东广州　511458
2.
广东省隧道结构智能监控与维护企业重点实验室，广东广州　511458
3.
中铁隧道勘察设计研究院有限公司，广东广州　511458

基金项目: 中国中铁股份有限公司科技研究开发计划（cz 02-专项-02；2021-重点-44）；广州市科技计划市校（院）企联合资助项目（2024A03J0981）；中铁隧道局集团科技创新计划（隧研合2021-06）

详细信息

作者简介:
杨朝帅，男，1986年生，硕士，高级工程师，从事隧道及地下工程科研工作。E-mail：394343652@qq.com

中图分类号: U452
计量
- 文章访问数: 26
- HTML全文浏览量: 10
- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2023-12-08
- 修回日期: 2024-04-18
- 录用日期: 2024-05-09
- 网络出版日期: 2025-04-07
- 刊出日期: 2025-04-08

Degradation of surrounding rock parameters in deep buried caverns: experimental and numerical simulation study

Yang Chaoshuai^{1, 2, 3
,},
Li Daqiang^{1, 2, 3}

1.
China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong, China
2.
Guangdong Provincial Key Laboratory of Intelligent Monitoring and Maintenance of Tunnel Structure, Guangzhou 511458, Guangdong, China
3.
China Railway Tunnel Consultants Co., Ltd., Guangzhou 511458, Guangdong, China

摘要

摘要: 洞室开挖会导致围岩刚度和强度参数劣化，而深埋洞室开挖过程中围岩参数劣化规律尚不明确。为此，通过对木寨岭隧道围岩的跨孔声波测试，揭示洞室开挖过程中参数劣化的空间分布规律，同时建立考虑围压和塑性应变影响的围岩参数劣化模型（CSS模型）并应用到该工程数值模拟中。结果表明：洞室开挖过程中围岩波速下降，可推断出围岩参数发生劣化；采用CSS模型能更好地反映出这种参数劣化现象；围岩参数劣化的空间分布规律可分区表示，越靠近洞壁，参数劣化程度越高，塑性区之外区域，在围压足够大的情况下会出现参数强化的情况。
- 深埋洞室 /
- 围岩劣化 /
- 弹塑性 /
- 跨孔声波测试
Abstract: Tunnel excavation can lead to degradation of the stiffness and strength parameters of the surrounding rock, while the degradation law of the surrounding rock parameters during deep buried tunnel excavation is still unclear. Therefore, by conducting cross hole acoustic testing on the surrounding rock of the Muzhailing Tunnel, the spatial distribution pattern of parameter degradation during the excavation process of the tunnel cavern was revealed. At the same time, a parameter degradation model (CSS model) considering the effects of confining pressure and plastic strain was established and applied to the numerical simulation of the project. The results showed that the wave velocity of the surrounding rock decreased during the excavation process, and the degradation pattern of the surrounding rock parameters can be inferred. The use of CSS models can better reflect this parameter degradation phenomenon. The spatial distribution pattern of the deterioration of surrounding rock parameters can be represented by zones. The closer it is to the tunnel wall, the higher the degree of parameter degradation. In areas outside the plastic zone, parameter strengthening may also occur under sufficient confining pressure.
- deep buried cavern /
- degradation of surrounding rock /
- elastic-plastic behavior /
- cross hole acoustic test

HTML全文

图 1 CSS本构模型

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图 2 CSS模型计算流程图

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图 3 MTS815电液伺服岩石试验系统

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图 4 三轴压缩试验与CSS模型应力应变曲线

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图 5 渭武高速木寨岭隧道路线地层剖面图

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图 6 跨孔声波测试示意

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图 7 跨孔声波测试钻孔布置图

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图 8 现场操作与数据处理

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图 9 洞室声波时程曲线

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图 10 围岩的拟合波速场

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图 11 推导围岩参数场

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图 12 数值模型示意

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图 13 CSS模型和MC模型塑性区对比

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图 14 CSS模型应力应变场

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图 15 MC模型应力应变场

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图 16 CSS模型与MC模型应力应变对比

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图 17 CSS模型与实测参数对比

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图 18 洞室围岩分区及劣化程度示意

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表 1 待定参数表

弹性模量待定参数	黏聚力待定参数	内摩擦角待定参数
e₁=−9333	c₁=1.8	φ₁=9.4
e₂=19.3	c₂=5.2×10⁻⁴	φ₂=5.03×10⁻⁴
e₃=−2.91×10⁶	c₃=0.047	φ₃=0.23
e₄=36000	c₄=2.3	φ₄=14.2

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表 2 MC模型物理力学参数

黏聚力c/MPa	内摩擦角φ/（°）	弹性模量E/MPa	泊松比v
5.5	28	3.5×10⁴	0.25

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表 3 CSS模型物理力学参数

黏聚力c/MPa	内摩擦角φ/(°)	弹性模量E/MPa	泊松比v
$ c_1\cdot e^{-\frac{\varepsilon\mathrm{\mathrm{_t^p}}}{c_2}}+c_3\cdot\sigma_3+c_4 $	$ \varphi_1\cdot e^{-\frac{\varepsilon\mathrm{\mathrm{_t^p}}}{\varphi_2}}+\varphi_3\cdot\sigma_3+\varphi_4 $	$ e_1\cdot e^{-\frac{\sigma_3}{e_2}}+e_3\cdot\varepsilon_{\mathrm{t}}^{\mathrm{p}}+e_4 $	0.25
注：e₁—e₄，c₁—c₄，φ₁—φ₄参数取值见表1。

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