三峡库区一个特殊古滑坡的综合研究

Systematic Researches of One Special Paleo landslide in the Three Gorges Reservoir

在三峡水库已深入勘测的２００多处大型滑坡中，重庆钢铁公司厂区古滑坡由于其沿侏罗系砂泥岩近水平层面的推动式滑坡机制从而表现出特有的运动过程。用滑动面上抗剪强度与滑动力的简单比较，绝对无法解释该古滑坡的最初起动机制。１９９４～１９９６年的综合研究，我们发现了蒙脱石软弱夹层，从而为合理解释古滑坡机制找到了重要的地质根据。实验室的综合测试所展示的滑动面微观形貌可能是在国内外文献中从未见到的。钻孔倾斜仪的深部位移监测与稳定性分析能很好地相互吻合。部分古滑体仍继续蠕变。

Among more than 200 large scale landslides intensively investigated in the Three Gorges reservoir, Chonggang landslide presented in this paper shows a very specific mechanism because of its translational movement along an almost horizontal bedding plane of Jurassic system interbedded by sand stone and clay stone It is absolutely impossibie to explain the initial mobilization in comparison between the angle of sliding surface and the shear strength According to our new research from 1994 to 1996, one explanation for its initiation has become more logical due to the discovery of a very thin intercalation of montmorillonite clay of sedimentary genesis Comprehensive tests in laboratory presented very interesting micro-figures along the old sliding surface, which would be first in the world to be shown The measurements by inclinometers correspond exactly to the stability analysis The old slide body continues its creeping