长江科学院院报 ›› 2022, Vol. 39 ›› Issue (6): 145-149.DOI: 10.11988/ckyyb.20211075

• 引江济淮工程膨胀土专栏 • 上一篇    下一篇

引江济淮工程江淮分水岭软弱夹层对边坡稳定的影响

甘旭东1, 龚壁卫2, 胡波2, 李波2, 刘明华3   

  1. 1.安徽省引江济淮集团有限公司,合肥 230000;
    2.长江科学院 水利部岩土力学与工程重点实验室,武汉 430010;
    3.安徽省水利水电勘测设计研究总院有限公司,合肥 230000
  • 收稿日期:2021-10-12 修回日期:2022-02-07 出版日期:2022-06-01 发布日期:2022-06-30
  • 通讯作者: 胡 波(1980-),男,湖北仙桃人,正高级工程师,博士,主要从事特殊土、非饱和土与环境岩土工程等方面的研究工作。 E-mail:woshihubo135@sina.com
  • 作者简介:甘旭东(1987-),男,安徽六安人,高级工程师,硕士,主要从事特殊土方面的研究及科研管理工作。E-mail:512436693@qq.com
  • 基金资助:
    国家重点研发计划项目(2017YFC1501201);安徽省引江济淮集团有限公司科技项目(YJJH-ZT-ZX-20191031216)

Influence of Weak Interlayer on Slope Stability in Jianghuai Watershed of Yangtze-to-Huaihe River Water Diversion

GAN Xu-dong1, GONG Bi-wei2, HU Bo2, LI Bo2, LIU Ming-hua3   

  1. 1. Anhui Provincial Group Limited for Yangtze-to-Huaihe River Water Diversion, Hefei 230000, China;
    2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze RiverScientific Research Institute, Wuhan 430010, China;
    3. Anhui Survey and Design Institute of Water Resourceand Hydropower Co., Ltd., Hefei 230000, China
  • Received:2021-10-12 Revised:2022-02-07 Online:2022-06-01 Published:2022-06-30

摘要: 引江济淮工程江淮分水岭局部存在顺坡向缓倾角夹层,施工期部分深挖方河渠因开挖时间长,已经出现了局部滑坡,初步分析结果表明这与夹层岩土体在大变形条件下强度已接近残余状态有关。为了分析夹层对边坡稳定的影响,对滑坡渠段的原状地层进行了取样,分析了渠坡软弱夹层的强度特性,并结合实际工程断面开展边坡稳定分析,提出了处理措施建议。研究表明,本工程渠坡稳定性取决于渠坡软弱夹层的位置、倾向和力学指标,滑坡部位软弱夹层在大变形的持续作用下已处于残余强度状态,并引发了局部滑坡。为此,对本工程深挖方渠段应结合渠坡岩土的分层结构及强度特性,采用抗滑桩和锚固等支档措施进行加固,同时应做好渠坡排水。

关键词: 边坡稳定, 软弱夹层, 残余强度, 抗滑桩, 锚固, 引江济淮工程

Abstract: Due to the bedding weak interlayer with gentle dip angle along the slope of Yangtze-to-Huaihe River Water Diversion in Jianghuai watershed, parts of canal slope have been excavated for a long time during construction, resulting in increased deformation of interlayer and slope collapse. Preliminary analysis reveal that the strength of the interlayer rock mass is close to residual state under the condition of large deformation. To investigate the influence of interlayer on slope stability, we collected undisturbed soil samples from some deep excavated canal sections and examined the strength characteristics of weak interlayer and carried out slope stability analysis, and also put forward some suggestions of treatment measures. Stability analysis unveil that the canal slope stability depends on the position, tendency and mechanical indexes of the weak interlayer in canal slope. The weak interlayer of canal slope has been in the state of residual strength under the continuous action of large deformation, which leads to local collapse. We suggest to reinforce the slope with retaining measures such as anti-slide pile and anchorage in association with slope drainage in line with the layered structure and strength characteristics of the canal slope.

Key words: slope stability, weak interlayer, residual strength, anti-slide pile, anchorage, Yangtze-to-Huaihe River Water Diversion

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