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锁儿头滑坡是甘肃省舟曲县城附近、体积约72.85×106 m3的一个巨型老滑坡。20世纪70年代末滑坡开始复活,至今一直处于缓慢活动之中,显示滑坡活动具有典型的蠕动特点。滑带力学特性是控制滑坡活动机制的关键因素之一,为了弄清该滑坡滑带物质的蠕变性质以及控制滑坡活动的强度指标,通过滑带土残余状态下的直剪蠕变试验,研究了滑坡滑带土的蠕变特性,比较了滑带长期强度和残余强度的关系。研究发现,滑带土蠕变特性与应力状态相关,滑带进入加速蠕变的临界剪应力和剪切速率均与正应力线性正相关。该滑坡应力状态指示其已具备进入加速蠕变的条件。残余状态下该滑坡滑带土的长期与残余强度基本等价,前者略大于后者,且增大量值与正应力有负相关关系。
Locker head landslide is a huge old landslide with a volume of about 72.85 × 106 m3 near Zhouqu County, Gansu Province. The landslide began to revive in the late 1970s and so far has been in a slow movement, showing that the landslide activity has typical characteristics of peristalsis. In order to find out the creep properties of landslide material and the strength index to control landslide activity, the dynamic characteristics of sliding zone is one of the key factors to control the landslide activity mechanism. Through the direct shear creep test of the residual state of landslide soil, The creep characteristics of sliding landslide soil are compared, and the relationship between long-term strength and residual strength of sliding lands is compared. It is found that the creep characteristics of slip zone soil are related to the stress state, and both the critical shear stress and shear rate of slip zone entering accelerated creep are positively correlated with the normal stress linearly. The landslide stress state indicates that it is ready for accelerated creep. In the residual state, the long-term and residual strength of the landslide soil are basically equivalent, the former is slightly larger than the latter, and the increasing magnitude is negatively correlated with the normal stress.