黄土填方高边坡变形破坏机制分析

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FLAC^3D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。

DEFORMATIONMECHANISM OF HIGH LOESS EMBANKMENT SLOPE

This paper relies on geotechn ical engineering investigat ion of high loess embankment slope in the oilfield site northw estern of China. It is based on the analysis o f eng ineering geo log ical cond itions and deformation character istics. It stud ies the slope deform ation and failuremechan ism. A three- dimension geo log icalmodel is es tablished to analyze the distribution of stress and stra in of the loess f ill slope. The FLAC^3D so ftw are is used to simu late the deform ationm echan ism o f the slope. The numerica l resu lt ind icates that them ain transform and fa il zone beg in from abrupt hole surroundings and follow s face o f slope to get dow n a 20- 25 meter. The bottom interface is the surface o f contact betw een theHo loceneE poch f ill earth storey Q4 and the orig ina l loessQ3. The numerica l re su lt further ind icates that the slope has adequate stab ility aga inst landslide. Any large deformation and fa ilure o f the slope is found to be impossib le.