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复杂孕灾环境下隧道进口斜坡稳定性分析与评价

徐正宣 林之恒 刘云鹏 聂晓芳 任利 张志龙

徐正宣, 林之恒, 刘云鹏, 聂晓芳, 任利, 张志龙. 复杂孕灾环境下隧道进口斜坡稳定性分析与评价[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20220361
引用本文: 徐正宣, 林之恒, 刘云鹏, 聂晓芳, 任利, 张志龙. 复杂孕灾环境下隧道进口斜坡稳定性分析与评价[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20220361
XU Zhengxuan, LIN Zhiheng, LIU Yunpeng, NIE Xiaofang, REN Li, ZHANG Zhilong. Stability Analysis and Evaluation of a Tunnel Entrance Slope Under Complex Disaster-Prone Environments[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220361
Citation: XU Zhengxuan, LIN Zhiheng, LIU Yunpeng, NIE Xiaofang, REN Li, ZHANG Zhilong. Stability Analysis and Evaluation of a Tunnel Entrance Slope Under Complex Disaster-Prone Environments[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220361

复杂孕灾环境下隧道进口斜坡稳定性分析与评价

doi: 10.3969/j.issn.0258-2724.20220361
基金项目: 国家自然科学基金(42171355)
详细信息
    作者简介:

    徐正宣(1977—),男,教授级高级工程师,博士研究生,研究方向为工程地质,E-mail:30567351@qq.com

  • 中图分类号: U452.1

Stability Analysis and Evaluation of a Tunnel Entrance Slope Under Complex Disaster-Prone Environments

  • 摘要:

    高地震烈度、高地应力、高陡、高寒等复杂孕灾环境下的隧道洞口斜坡,在降雨、强震或人类强烈工程活动影响下,极易发生崩塌、滑坡、泥石流等地质灾害. 为探究复杂孕灾环境下隧道进口斜坡在不同工况条件下的稳定性,以我国西南某加日山隧道为依托,通过无人机摄影、槽探、室内实验及洞探原位测试等“天空地”一体化勘察技术,实现斜坡工程地质信息精细获取,系统揭示斜坡典型破坏特征,讨论斜坡2种破坏成因与演化模式,在此基础上,利用极限平衡法与三维数值模拟方法,量化分析不同工况下的斜坡稳定性. 研究结果表明:加日山隧道进口斜坡在自然工况、暴雨工况、地震工况3种工况下稳定性系数均大于1.15,斜坡整体处于稳定状态,仅后缘表部存在局部变形失稳的可能,成果可为类似隧道的选线规划以及建设运营安全提供理论指导和技术支撑.

     

  • 图 1  石林、石墙、石丛地貌及石墙走向

    Figure 1.  Morphologies of stone forest, stone wall, stone cluster, and direction of stone wall

    图 2  斜坡地层展布

    Figure 2.  Strata of slope

    图 3  多手段获取的斜坡岩体卸荷特征

    Figure 3.  Unloading characteristics of slope obtained using various methods

    图 4  坡面小型溶洞沿构造线分布示意

    Figure 4.  Distribution of small caves of slope along structural lines

    图 5  InSAR形变速率图

    Figure 5.  Deformation rate determined by InSAR technique

    图 6  坡体变形破坏后的地形地貌

    Figure 6.  Morphologies of slope after deformation and failure

    图 7  某隧道进口斜坡推测潜在失稳模式

    Figure 7.  Potential instability patterns of slope at tunnel entrance

    图 8  模型图

    Figure 8.  Models

    图 9  斜坡塑性区分布

    Figure 9.  Distribution of plastic zones of slope

    表  1  斜坡岩体力学参数建议值

    Table  1.   Suggested mechanical parameters of slope rock masses

    岩体质量等级干密度 ρd (g·cm−3变形模量 E0/GPa泊松比 μ抗剪断强度
    摩擦系数黏聚力 /MPa
    Ⅱ 类2.52~2.5810~200.25~0.291.20~1.401.50~2.00
    Ⅲ 类2.30~2.505~100.29~0.330.80~1.200.70~1.50
    Ⅳ 类2.10~2.402~50.33~0.370.55~0.800.30~0.70
    下载: 导出CSV

    表  2  结构面强度试验成果

    Table  2.   Test results ofstructural surface strength

    试验编号试验位置/m抗剪断强度抗剪强度地质特征
    摩擦系数黏聚力/MPa摩擦系数黏聚力/MPa
    1-1PDG01 洞0+150 m1.091.330.870.20 主要为压碎带弱风化大理岩,但剪切主要沿压碎带及其影响带剪断
    1-2PDG01 洞0+71 m0.811.340.700.51 弱风化大理岩,碎裂结构,岩级为 Ⅳ 岩体
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-05-17
  • 修回日期:  2022-09-24
  • 网络出版日期:  2024-01-12

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