新疆伊犁典型特大型黄土滑坡群成因机制及变形特征

新疆伊犁黄土的成因、分布特征及物理力学性质与黄土高原的黄土有很大不同，该地区的黄土滑坡也有一定的特殊性。以省道 S316线则克台沟某特大型黄土滑坡群为研究对象，结合地质勘察和土样试验结果，对该滑坡群的成因机制及变形特征进行了分析。结果表明：伊犁地区则克台沟黄土揭露埋深达到62 m ，并具备发生大规模深层滑坡的地质条件。伊犁地区黄土0．005 m ～0．05 mm 粒组含量普遍达到60％以上，相比黄土高原的黄土要高，具有一定的静态液化势，对雨水入渗作用敏感。滑坡区山体植被破坏严重，4月—6月份的融雪和降雨集中入渗是导致该地区黄土滑坡的主要原因。该滑坡成群出现，滑动面上陡下缓，伴随蠕动和滑动液化，属于特大型深层黄土滑坡群。对于伊犁地区的黄土滑坡，预测预报、恢复植被及截排水措施尤为重要。

Sliding Mechanism and Deformation Characteristics of Typical Large Loess Landslides in Yili Xinjiang

The loess in Yili Xinjiang are particular at its formation ,distribution ,physical and mechanical properties , which are quite different from loess in the Loess Plateau .The loess landslides in this area also have their particularity . This paper discussed the geological conditions and characteristics of loess in Yili and analyzed the influence of its special particle composition on loess traits .Combined with field geological survey and indoor tests ,the sliding mechanism and deformation characteristics of a large loess landslides group at the Zeketai Ditch along the S316 line were analyzed .The results showed that :the exposed depth of loess at the Zeketai Ditch is at least 62 meters ,having the geological conditions for large-scale deep landslide .The particle content is between 0 .005 mm ~ 0 .05 mm of loess in Yili generally accounts for more than 60% ,which is higher than that of the Loess Plateau .The loess is of high static liquefaction potential ,and sensitive to the effect of rainfall infiltration .With mountain vegetation of landslide area damaged seriously ,the loess landslides in Yili are mainly induced by the infiltration of snowmelt and rainfall from April to June .The landslides out-broke in crowds with the upper part of sliding surface steep and the lower part gentle ,accompanied by creeping and slid-ing liquefaction .They were judged for the oversize deep loess landslides group .To the loess landslides in Yili area ,fore-cast ,vegetation restoration and intercepting drainage measures are particularly important .