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| GEOLOGICAL ANALYSIS AND MODEL EXPERIMENTAL STUDY OF DEFORMATION MECHANISM OF DITCH-MOORE RED BED LANDSLIDE AT QINGHAI PLATEAU |
(1. China Academy of Railway Sciences，Beijing 100081，China；2. Northwest Research Institute Co.，Ltd. of CREC，Lanzhou，Gansu 730000，China；3. Department of Geotechnical Engineering，Southwest Jiaotong University，Chengdu，
Sichuan 610031，China) |
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Abstract Taking the Ditch-Moore #DH6 landslide in Xijiu road(S101) as typical representation，the deformation mechanism of red bed landslide at Qinghai Plateau affected by valley incision and rainfall infiltration was studied by geological analysis and geotechnical model test. In geomechanical model test，slope excavation is used to simulate the valley incision；and the technique of capillary infiltration is used to simulate the rainfall infiltration. Displacement is an important index of the test. The influence of valley incision and rainfall infiltration on slope displacement are analyzed separately；then a comprehensive analysis of two factors is made；and the roles of two weights are analyzed. The results indicate that valley incision and rainfall infiltration play important roles in the deformation of red bed landslide. The root causes of slope deformation are two strength degradation process based on special ground nature of red bed：(1) Unloading relaxation caused by valley incision(the first intensity attenuation) and the invading surface are the basis for the emergence of landslide；(2) Long-term softening of rock mass strength induced by rainwater infiltration(second intensity decay) is the direct cause of landslide development. Therefore，the mechanism of the red bed landslide is summarized as “the original landscape→valley incision→valley slope relaxation→geotechnical strength decay→rainfall infiltration→geotechnical strength decay further→overall slip”by comprehensive analysis as the representative to the Ditch-Moore #DH6 landslide.
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Received: 13 May 2010
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2010, Vol. 29 
