重庆鹤峰乡场镇滑坡新变形区特征与多工况稳定性研究

Study on Characteristics and Multi-case Stabilities of the New Deformation Zone of Changzhen Landslide in Hefeng Township,Chongqing City

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。

The Changzhen landslide located in Hefeng Township,Fengjie County,Chongqing City experienced a severe sliding deformation in 2001 and being in a stable state after an engineering treatment.Later,because of the impoundment of the Three Gorges reservoir area,new local deformation occurred.The stability of the deformation zone of seven different conditions was calculated by the transfer coefficient method.The results showed that the new deformation zone of the landslide was greatly affected by the water level of the reservoir and heavy rainfall.The new deformation zone would in a less stable state under the condition of the water level in front of the dam in the reservoir area dropped from 175 m to 145 m.The new deformation zone would in an unstable state if the water lever in front of the dam in the reservoir area dropped from 175 m to 145 m accompanying with a 5-day-continuous rainfall once in 20 years intensity in non-flood season.The new deformation zone would in stable-basic stable states under other five kinds of conditions.This study provided a methodological reference for the deformation and stability analysis of similar landslides.