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大沟湾滑坡是瞿家湾滑坡群中相对高差最大的滑坡体,洞坪水库蓄水后滑坡体产生了较大变形且变形机制表现出一定的特殊性.野外调查研究表明:蓄水前该滑坡体稳定性良好;蓄水至452m后,滑坡后缘堆积体与基岩交界处产生贯通滑坡两侧冲沟的连续裂缝,剪出口位于整个滑体中部580m高程附近,由于下部坡体的抗滑作用而使整个坡体仍处于稳定状态;蓄水至488m后,从整个滑体前缘到570m高程附近又形成另一滑坡体,与先前上部滑坡呈梯级分布,分析得出大沟湾滑坡为上部牵引-下部推移的复合式滑坡,两个滑坡共同作用导致整个滑体发生明显变形.分析并利用FLAC3D模拟再现整个变形过程,对滑坡体变形破坏机制做出了很好解释.
Daguchiwan landslide is the largest relative landslide body in Qujiawan Landslide Group, and the landslide body has a large deformation after deformation and the deformation mechanism shows a certain degree of certainty after the Dongping Reservoir has been filled in. Field investigation shows that: before water storage The stability of the landslide body is good. After 452m of water storage, the continuous cracks of the gullys on both sides of the landslide are generated at the junction of the landslide deposit and bedrock. The shear outlet is located near the 580m elevation in the middle of the landslide body. After the water storage reaches 488m, another landslide body is formed from the entire front of the sliding body to an altitude of 570m. Compared with the previous upper landslide, another landslide body is formed, which shows that Dagou Bay The landslide is a composite landslide with the upper traction and the lower landslide, and the two landslides cause the obvious deformation of the whole landslide.According to FLAC3D simulation, the deformation process is reproduced and the deformation and failure mechanism of the landslide is explained well.