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铜矿岭不稳定斜坡类型识别与工程地质分区

贾伟 罗昌宏 董钊 汪鸣飞 刘小红 包刘磊

贾伟, 罗昌宏, 董钊, 汪鸣飞, 刘小红, 包刘磊. 铜矿岭不稳定斜坡类型识别与工程地质分区[J]. 地质科技通报, 2022, 41(2): 91-103. doi: 10.19509/j.cnki.dzkq.2022.0057
引用本文: 贾伟, 罗昌宏, 董钊, 汪鸣飞, 刘小红, 包刘磊. 铜矿岭不稳定斜坡类型识别与工程地质分区[J]. 地质科技通报, 2022, 41(2): 91-103. doi: 10.19509/j.cnki.dzkq.2022.0057
Jia Wei, Luo Changhong, Dong Zhao, Wang Mingfei, Liu Xiaohong, Bao Liulei. Type identification and engineering geology zoning of the unstable slope in Tongkuangling[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 91-103. doi: 10.19509/j.cnki.dzkq.2022.0057
Citation: Jia Wei, Luo Changhong, Dong Zhao, Wang Mingfei, Liu Xiaohong, Bao Liulei. Type identification and engineering geology zoning of the unstable slope in Tongkuangling[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 91-103. doi: 10.19509/j.cnki.dzkq.2022.0057

铜矿岭不稳定斜坡类型识别与工程地质分区

doi: 10.19509/j.cnki.dzkq.2022.0057
基金项目: 

湖北省宜昌至巴东高速公路建设指挥部项目"宜巴高速公路" 

详细信息
    作者简介:

    贾伟(1982—),男,高级工程师,主要从事高速公路工程地质灾害防治工作。E-mail: 10633836@qq.com

    通讯作者:

    汪鸣飞(1996—),男,助理工程师,主要从事高速公路工程地质勘察工作。E-mail: wangmingfei@cug.edu.cn

  • 中图分类号: P642.22

Type identification and engineering geology zoning of the unstable slope in Tongkuangling

  • 摘要: 高速公(铁)路路基、隧道和桥梁工程等常常因地质灾害的存在而影响正常使用, 尤其是类型不明的不稳定斜坡, 明确地质灾害类型是影响不稳定体治理方案的首要任务。以宜巴高速公路铜矿岭不稳定斜坡为研究对象, 采用野外地质调查、工程地质分析和监测数据分析的方法, 判明了铜矿岭不稳定斜坡类型。野外调查结果表明该不稳定斜坡上部为残坡积物, 下部为反倾结构的粉砂岩; 结合位移监测数据, 判定该不稳定斜坡变形存在多个剪切滑移带, 但主要分布于松散堆积物内部, 综合判定该不稳定斜坡为深层蠕动变形体; 依据变形大小和变形方向变化特点, 最后将该变形体分为两个大区, Ⅱ区又可细分为2个小区, 并指出Ⅱ2区是未来防治的关键部位。研究成果为该不稳定斜坡后续治理设计提供了地质依据, 证明传统的工程地质调查、分析与位移监测相结合是开展不稳定体类型判识, 确定边界范围的有效手段。

     

  • 图 1  铜矿岭不稳定斜坡

    Figure 1.  Unstable slope in Tongkuangling Tunnel

    图 2  监测期间日降雨量

    Figure 2.  Daily rainfall during the monitoring period

    图 3  巴东县构造纲要图(★为研究区位置)

    J.侏罗系;T2b4.巴东组第四段;T2b3.巴东组第三段;T2b2.巴东组第二段;T2b1.巴东组第一段;T1j.嘉陵江组。1.地质界线;2.滑坡;3.断层;4.平移断层;5.褶皱(左为背斜,右为向斜); 6.产状

    Figure 3.  Structural outline map of Badong County

    图 4  工程地质平面图

    Figure 4.  Geological plane of engineering

    图 5  斜坡体上公路建构筑物变形迹象(2019.8.15拍摄)

    a.隧道侧壁混凝土结构开裂;b.桥面左线护栏侧向位错

    Figure 5.  Deformation sign of the highway structures on the unstable slope

    图 6  GNSS地表水平位移累积值监测时程曲线

    Figure 6.  Horizontal displacement curves with time of GNSS monitoring

    图 7  GNSS地表监测位移矢量图

    Figure 7.  Displacement vector diagram based on GNSS monitoring

    图 8  测斜孔总位移随深度变化曲线

    Figure 8.  Variation curves of total displacement with depth of inclinometer holes

    图 9  不稳定斜坡工程地质分区

    Figure 9.  Engineering geology of division of the unstable slope in Tongkuangling

    表  1  地表位移监测点水平位移值汇总

    Table  1.   Summary table of the horizontal displacement data of the monitoring points

    监测点编号 正东位移量/mm 正北位移量/mm 水平位移量/mm 水平位移方向/(°)
    GNSS1 -2.1 8.4 8.7 346.0
    GNSS2 -55.5 41.2 69.1 306.6
    GNSS3 -76.2 -36.5 84.5 244.4
    GNSS4 -101.2 46.5 111.4 294.7
    GNSS5 -145.9 44.7 152.6 287.0
    GNSS6 -95.7 0.3 95.7 238.7
    GNSS7 -70.4 -3.8 70.5 222.4
    GNSS8 -84.2 63.2 105.3 306.9
    GNSS9 -10.8 5.6 12.2 297.4
    SK01 43.5 -75.3 86.9 297.0
    SK02 18.8 83.3 85.4 307.4
    SK03 -91.7 -63.5 111.5 235.3
    SK04 -26.1 -5.6 26.7 257.9
    SK05 -47.3 -8.3 48.0 260.0
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