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不同环剪条件下三峡库区童家坪滑坡滑带土强度特性

赵帆程 苗发盛 吴益平 薛阳 孟佳佳

赵帆程, 苗发盛, 吴益平, 薛阳, 孟佳佳. 不同环剪条件下三峡库区童家坪滑坡滑带土强度特性[J]. 地质科技通报, 2022, 41(2): 315-324. doi: 10.19509/j.cnki.dzkq.2022.0045
引用本文: 赵帆程, 苗发盛, 吴益平, 薛阳, 孟佳佳. 不同环剪条件下三峡库区童家坪滑坡滑带土强度特性[J]. 地质科技通报, 2022, 41(2): 315-324. doi: 10.19509/j.cnki.dzkq.2022.0045
Zhao Fancheng, Miao Fasheng, Wu Yiping, Xue Yang, Meng Jiajia. Strength characteristics of slip zone soils of the Tongjiaping landslide in the Three Gorges Reservoir area under different ring shear conditions[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 315-324. doi: 10.19509/j.cnki.dzkq.2022.0045
Citation: Zhao Fancheng, Miao Fasheng, Wu Yiping, Xue Yang, Meng Jiajia. Strength characteristics of slip zone soils of the Tongjiaping landslide in the Three Gorges Reservoir area under different ring shear conditions[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 315-324. doi: 10.19509/j.cnki.dzkq.2022.0045

不同环剪条件下三峡库区童家坪滑坡滑带土强度特性

doi: 10.19509/j.cnki.dzkq.2022.0045
基金项目: 

国家自然科学基金资助项目 42007267

国家自然科学基金资助项目 41977244

国家重点研发计划项目 2017YFC1501301

详细信息
    作者简介:

    赵帆程(1997-), 男, 现正攻读资源与环境专业硕士学位, 主要从事岩土体性质与工程安全研究。E-mail: zhaofancheng@cug.edu.cn

    通讯作者:

    苗发盛(1989-), 男, 副教授, 主要从事地质灾害预测预报与岩土力学特性研究工作。E-mail: fsmiao@cug.edu.cn

  • 中图分类号: P642.22

Strength characteristics of slip zone soils of the Tongjiaping landslide in the Three Gorges Reservoir area under different ring shear conditions

  • 摘要: 研究不同环剪条件下库岸堆积层滑坡滑带土强度特性对滑坡稳定性评价具有重要意义。针对目前在库岸堆积层滑坡滑带土力学特性方面研究薄弱的问题, 以三峡库区童家坪滑坡滑带土为研究对象, 采用ARS-E2环剪仪开展了不同剪切速率下的剪切试验, 研究了等速剪切、加速剪切以及减速剪切作用下滑带土强度变化特征。试验结果表明: 滑带土试样在恒定的低速剪切条件下更容易得到稳定的残余强度, 并且达到峰值强度后易出现"应变软化"现象; 在相同剪切应力条件下, 滑带土加速环剪和减速环剪的剪应力变化趋势基本一致, 与法向应力均呈正相关关系; 剪切速率的变化会显著影响滑带土峰值黏聚力的大小。研究成果揭示了不同环剪条件下滑带土力学特性, 可以为揭示库岸堆积层滑坡变形破坏的力学机制提供理论依据。

     

  • 图 1  童家坪滑坡平面图(a)及其变形特征(b~e)

    Figure 1.  Plane of the Tongjiaping landslide (a) and its deformation characteristic (b-e)

    图 2  童家坪滑坡1-1′剖面图

    Figure 2.  1-1′ profile of the Tongjiaping landslide

    图 3  ARS-E2型全自动闭合回路控制环剪仪

    Figure 3.  Fully automatic ring-shear apparatus(ARS-E2)

    图 4  滑带土颗粒分析曲线

    Figure 4.  Gradation curve of the soil sample on the sliding surface

    图 5  剪切完成后部分滑带土试样

    Figure 5.  Part of slip zone soil samples after the shearing test

    图 6  等速环剪的τ-s曲线

    Figure 6.  τ-s curves of ring shear at constant velocity

    图 7  等速环剪峰值强度-剪切速率关系

    Figure 7.  Relationship between peak strength and shear rate in constant velocity ring shear

    图 8  中部土样变速环剪τ-t曲线

    Figure 8.  τ-t curves of ring shear at variable speed for the middle soil sample

    图 9  后缘土样变速环剪τ-t曲线

    Figure 9.  τ-t curves of ring shear at variable speed for the rear soil sample

    图 10  变速环剪下滑带土峰值强度包线

    Figure 10.  Peak strength envelope of slip zone soil with variable speed ring shear

    表  1  滑带土基本物理力学性质指标

    Table  1.   Basic physical and mechanical property indexes of the slip zone soil

    取样位置 天然含水率/% 饱和含水率/% 天然干密度/(g·cm-3) 相对密度 液限/% 塑限/%
    中部 19.58 29.43 1.51 2.72 28.85 17.81
    后缘 20.14 27.51 1.56 2.70 28.42 16.33
    下载: 导出CSV

    表  2  滑带土环剪试验方案

    Table  2.   Scheme of the ring shear test for slip zone soil

    环剪方法 试样编号 有效法向应力/kPa 剪切速率/(mm·min-1) 滑带土位置
    等速环剪 HJ1-(1, 2, 3, 4, 5) 200 0.06, 0.6, 2, 6, 10 滑坡中部
    HJ2-(1, 2, 3, 4, 5) 滑坡后缘
    变速环剪 HJ3-(1, 2, 3) 50, 100, 200 0.02~15(加速) 滑坡中部
    HJ3-(4, 5, 6) 15~0.02(减速)
    HJ4-(1, 2) 50, 100 0.06~30(加速) 滑坡后缘
    HJ4-(3, 4) 30~0.06(减速)
    下载: 导出CSV

    表  3  等速环剪试验滑带土峰值强度特征

    Table  3.   Peak strength characteristics of slip zone soil of ring shear at constant velocity

    中部滑带土 后缘滑带土
    剪切速率/(mm·min-1) 峰值强度/kPa 达到峰值强度最小位移/mm 剪切速率/(mm·min-1) 峰值强度/kPa 达到峰值强度最小位移/mm
    0.06 106.73 32.94 0.06 112.88 8.17
    0.60 98.07 68.88 0.60 117.33 6.85
    2.00 107.30 217.30 2.00 105.18 273.68
    6.00 104.56 556.42 6.00 115.50 123.30
    10.00 90.92 130.09 10.00 104.32 334.38
    下载: 导出CSV

    表  4  变速环剪试验滑带土峰值强度特征参数

    Table  4.   Strength characteristic parameters of slip zone soilof ring shear at constant velocity

    试验条件 法向应力/kPa 强度参数
    50 100 200 φp/(°) cp/kPa
    峰位强度/kPa
    中部加速 32.06 62.22 111.61 27.92 7.37
    中部减速 24.24 61.02 104.45 27.47 2.53
    后缘加速 56.85 82.84 / 27.46 30.86
    后缘减速 54.95 81.72 / 28.37 28.18
    下载: 导出CSV
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  • 收稿日期:  2021-06-28

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