黄土滑坡滑带土剪切蠕变特性试验研究

滑带土蠕变特性对渐变型边坡时效变形起控制性作用。本文以黄土滑坡滑带土为研究对象，以含水率14%、18%、22%和26%作为控制条件，开展剪切蠕变试验，分析不同含水状态下黄土的应变特征、蠕变速率和长期强度变化规律。研究表明：滑带土在水作用下蠕变现象明显，包含衰减、稳定和加速蠕变阶段，与渐变型滑坡三阶段演化过程相对应；含水状态的增强对黄土蠕变变形和速率的增长起一定的促进作用，含水率的升高可能会使黄土更容易发生蠕变破坏行为；滑带土在四种含水率下的长期强度分别为96.37 kPa、78.04 kPa、65.38 kPa和41.29 kPa，长期强度随含水作用的增强而递减。该研究可为渐变型黄土滑坡长期变形及时变稳定性研究提供参考。

Experimental study on shear creep characteristics of soil in sliding zone of loess landslide

The creep characteristics of sliding zone soil exert a significant control on the aging deformation of gradual landslide. Taking the sliding zone soil of loess landslide as an example, this work performed shear creep tests under conditions of water content at 14%, 18%, 22% and 26%, and thus analyzed the strain characteristics, creep rate and long-term strength changes of loess under different water contents. Results show that the sliding zone soil displays significant creep phenomenon under the action of water, including attenuation, stability and accelerated creep stages, which corresponds to the three-stage evolution process of gradual landslide. The increase of water content can promote the creep deformation and rate of loess, and the increase of water content may make loess more prone to creep failure. The long-term strength of sliding zone soil under four water contents are 96.37 kPa, 78.04 kPa, 65.38 kPa and 41.29 kPa, respectively, which decreases with the increase of water content. This research will provide a certain reference for the study of long-term deformation and timely stability of gradual loess landslide.