重庆鹤峰乡场镇滑坡新变形区特征与多工况稳定性研究

重庆市奉节县鹤峰乡场镇滑坡于2001年发生过一次剧烈的滑动变形,经过工程治理之后处于稳定状态,后由于受到三峡库区蓄水的影响,发生了新的局部变形。利用传递系数法计算了7种不同工况的变形区稳定性,结果表明滑坡变形区受库区水位变化及暴雨影响较大。其中:库区坝前水位自175m降至145m,变形区处于欠稳定状态;库区坝前水位自175m降至145m+非汛期20年一遇暴雨,变形区处于不稳定状态;其它5种不同工况变形区处于稳定—基本稳定状态。为同类滑坡的变形与稳定性评价提供了方法参考。

Description of desertification evolution in Fuxin district of Liaoning province based on fractal theory

Desertification is the most serious environmental problem in the world today. Fractal feature of granularity composition was studied by using the fractal theory in view of desertification soil in Fuxin district, thereby evolution patterns of desertification was promulgated. The result shows that the self-formation degree of the developing desertification areas is higher than the relatively steady desertification areas. Evolution of desertification is beginning of forming sandy soil of framework composition, and then the sandy soil be came complex by the effect of environment, climate and anthropo-activity.