黄土填方高边坡变形破坏机制分析

DEFORMATION MECHANISM OF HIGH LOESS EMBANKMENT SLOPE

本文依据西北某油田倒班基地黄土填方高陡边坡工程勘察,研究了该边坡的变形破坏机制,通过对边坡工程地质条件及变形破坏分析,建立FLAC3D地质模型,采用数值模拟方法研究了边坡变形破坏机制。研究结果表明,主要变形区或破坏区为陡坎周围至其沿坡面向下20-25m的范围之间,其破坏深度底界为全新世填土层Q4与原状黄土Q3接触面,但要重点控制沿坡面向下20-25m的范围之间的变形。数值模拟结果表明,该边坡目前整体稳定性较好,不会发生整体变形破坏。

This paper relies on geotechnical engineering investigation of high loess embankment slope in the oil - field site northwestern of China. It is based on the analysis of engineering geological conditions and deformation characteristics. It studies the slope deformation and failure mechanism. A three - dimension geological model is established to analyze the distribution of stress and strain of the loess fill slope. The FLAC3D software is used to simulate the deformation mechanism of the slope. The numerical result indicates that the main transform and fail zone begin from abrupt hole surroundings and follows face of slope to get down a 20 -25 meter. The bottom interface is the surface of contact between the Holocene Epoch fill earth storey Q4 and the original loess Q3. The numerical result further indicates that the slope has adequate stability against landslide. Any large deformation and failure of the slope is found to be impossible.