泥岩滑坡体的处理分析

发布时间：2018-05-12 01:27

  本文选题：泥岩 + 滑坡　； 参考：《中国农村水利水电》2017年04期

【摘要】：某傍山渠道渠顶开挖后未及时支护,边坡裂缝、地下水入渗导致渠基泥岩含水量增高,强度大幅降低,在渠体开挖泥岩形成临空面后,3个月内发生2次滑坡,体积32万m~3。通过对滑坡成因及处理方案的分析,得出泥岩渠段一定要尽最大可能减少水的入侵,来不及进行支护的泥岩边坡,最好挖成稳定坡比,防止坡体产生裂缝为地下水下渗提供条件。通过对滑坡参数反演计算得出的泥岩抗剪强度更符合实际。滑坡处理采用明渠方案,即通过坡顶削坡卸载,挖除坡脚软弱泥岩,用透水性强的砂砾石填筑,除压坡脚外还兼做排水体。要求分期分段施工,避免施工期边坡再次失稳。对工期充裕,征地范围受限或征地成本较高,边坡高陡或不宜施工扰动的边坡,可采用埋涵方案。
[Abstract]:After excavation of the top of a mountain canal, the slope cracks and groundwater infiltration caused the increase of water content and the decrease of the intensity of the mudstone in the canal base. After the mudstone was excavated in the canal body, two landslides occurred within 3 months, with a volume of 320000 mm3. Based on the analysis of the cause of the landslide and the treatment scheme, it is concluded that the mudstone section must minimize the invasion of water as far as possible, and the mudstone slope which has no time to be supported is better to be excavated into a stable slope ratio. Prevention of cracks in slope provides conditions for groundwater infiltration. The shear strength of mudstone obtained by inversion of landslide parameters is more practical. The open channel scheme is adopted in the treatment of the landslide, that is, the soft mudstone at the foot of the slope is excavated by cutting the slope at the top of the slope, the soft mudstone is filled with sand and gravel with strong permeability, and it is also used as a drainage body in addition to the foot of the pressure slope. It is necessary to construct by stages to avoid the slope instability again during the construction period. For the slope with abundant construction period, limited land requisition scope or high cost, high and steep slope or unsuitable for construction disturbance, the buried culvert scheme can be adopted.
【作者单位】： 新疆水利水电勘测设计研究院;
【分类号】：TV223
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本文编号：1876516