蠕动型滑坡滑带土蠕变特性研究

发布时间：2018-04-27 16:51

本文选题：蠕动滑坡 + 滑带土　；参考：《岩土力学》2017年02期

【摘要】：蠕动型滑坡表现为长期缓慢的变形响应,其演化过程和稳定性受到滑坡滑带土蠕变性质的控制。选取三峡库区典型蠕动型滑坡马家沟滑坡为研究对象,针对该滑体滑带土原状试样开展大尺寸三轴蠕变试验,研究滑带土试样在不同围压和应力水平下的蠕变规律,并进一步采用等时曲线法确定滑带土长期强度与常规强度的差异。研究结果表明,马家沟滑坡滑带土具有典型的稳定蠕变材料特性,蠕变阶段可分为衰减蠕变和稳定蠕变2个变形过程,其变形趋势与滑坡宏观变形演化具有较好的一致性;滑带土绝对蠕变量和稳定蠕变阶段的变形速率均与轴向应力值呈正相关,而衰减蠕变阶段的持续时长随着剪应力水平增加基本呈线性增加。滑带土长期强度参数与常规强度参数比较,其长期黏聚力c值和长期内摩擦角?值分别下降24.8%和22.4%。
[Abstract]:The creep type landslide is characterized by long and slow deformation response, its evolution process and stability are controlled by the creep property of landslide belt soil. The typical creep landslide Majiagou landslide in the Three Gorges Reservoir area is selected as the research object. The large size three axis creep test is carried out for the original specimen of the slide soil, and the different confining pressure of the slide soil specimen is studied. The creep law under the stress level and the isochronous curve method are further used to determine the difference between the long-term strength and the conventional strength of the slide soil. The results show that the slip zone soil of the Ma Jia Gou landslide has the typical properties of the stable creep material, and the creep stage can be divided into 2 deformation processes, the attenuation creep and the stable creep, and the deformation trend and the landslide macroscopic The deformation evolution has good consistency, the absolute creep and the creep deformation rate of the sliding zone are positively correlated with the axial stress value, while the continuous length of the attenuated creep stage increases linearly with the shear stress level increasing. The long term cohesive force C value and the length of the long term cohesive force are compared with the regular strength parameters. The friction angles of the period are reduced by 24.8% and 22.4%., respectively.

【作者单位】：中国电建集团华东勘测设计研究院工程勘测处;中国地质大学(武汉)工程学院;华北水利水电大学水利学院;
【基金】：国家重点基础研究发展项目(973计划)(No.2011CB710604) 国家自然科学基金项目(No.41272305)~~
【分类号】：TU411

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