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Landslide Group Treatment for Xining-Jiuzhi Highway in Qinghai

Provincial road S101 is the secondary road in Qinghai from Xining to Jiuzhi and is also the main road connecting Xining with the southern region of Qinghai. The Xining-Jiuzhi highway is located in the high altitude areas with the exposed stratum mainly composed of tertiary red mudstone featured by poor lithology, low strength and easy softening, and large-scale distribution of ancient landslide mass along the line.

 Specifically, six ancient landslide masses are distributed on its Longmuergou section, with the obvious characteristics of landslide in red-mudstone-layer, such as low strength of landslide mass, abundant groundwater, great influence of seasonal variation (especially the freeze-thrawing) on landslide deformation. On this basis, NWRI has done a series of comprehensive treatments for the landslide, taking the measures of draining, retaining, back loading, etc. based on the detailed engineering geological investigation.

After the completion in 2008, no landslide occurred on this highway section, showing that the goal of landslide treatment is achieved.

 

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