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曲玛滑坡为一体积达7 300×104 m~3的特大型古滑坡。滑坡主要发生于新近系上新统泥岩构成的平缓逆向斜坡中。由于新近系泥岩胶结程度低、结构较松散,降雨或冰雪消融水沿垂直节理的入渗,进一步降低了岩体的抗剪强度,导致斜坡发生圆弧形切层破坏。定性分析和数值模拟分析表明,滑坡在暴雨工况下整体处于基本稳定状态,局部陡坡处可发生规模较小的滑塌破坏,在地震工况下滑坡整体处于潜在不稳定状态,对前缘曲玛村居民带来潜在威胁。成果为该滑坡治理决策提供依据。
Quma landslide is a large-scale ancient landslide with a volume of 7 300 × 104 m ~ 3. Landslides mainly occur in the gentle reverse slope formed by the Neo-Pliocene mudstone. Due to the low level of cementation and relatively loose structure, the infiltration of rainfall or ice-melt water along vertical joints further reduces the shear strength of rock mass and leads to arc-shaped layer failure of slope. Qualitative analysis and numerical simulation show that the landslide is basically stable under the condition of heavy rain, and the landslide can be caused by the small scale collapse failure in the local steep slope. The whole landslide is in a potentially unstable condition under the earthquake conditions. Ma Village residents bring potential threats. The results provide the basis for the landslide governance decision-making.