摘要
黄土滑坡及次生灾害是新疆伊犁谷地最普遍和典型的灾害类型,具分布最广、发生频率最高、危害性最大的特点。以伊犁苏阿苏沟东岸黄土滑坡群为研究对象,通过现场勘察获取岩土体形态特征和力学参数,确定岩土体结构和发育特征,并对成因进行分析。研究表明:该滑坡群为“黄土+砂砾石+软岩(泥岩)”结构模式,滑体由第四系黏砂土和卵石夹黏土组成,滑床为中侏罗统西山窑组泥岩,二者接触带为滑动面,属层内错动,呈多级或局部滑动。滑体上部裂缝以横向裂缝为主,下部以放射状裂缝为主,于滑坡前缘形成鼓丘。该滑坡成因类型为浅层牵引式滑坡,季节性降水和冰雪融水为发生滑坡的主导因素。
The loess landslide and its secondary disasters are the most common and typical disaster types in the Yili Valley of Xinjiang,with the characteristics of the widest distribution,the highest frequency and the most harmful.In this paper,the loess landslide group on the east bank of Asuligou in Ili is taken as the research object.The morphological characteristics and mechanical parameters of the rock and soil mass are obtained through site survey,and the structure and development characteristics of the rock and soil mass are determined.Studies have shown that the landslide group is a structure model of"loess+gravel+soft rock(mudstone)".The landslide is composed of Quaternary subsand soil and pebble with clay.The sliding bed is mudstone of the Middle Jurassic Xishanyao Formation.The contact surface of the two has sliding surfaces,which are distorted within the layer and slide in multiple stages or parts.The cracks in the upper part of the landslide are mainly transverse cracks,and the lower part is mainly radial cracks.Drum mounds are formed at the leading edge of the landslide.The cause of the landslide is a shallow traction landslide.Seasonal precipitation and melting snow and ice are the dominant factors in the occurrence of landslides.
作者
曹小红
孟和
尚彦军
弓小平
徐凤娟
艾比拜尔·买买提
Cao Xiaohong;Meng He;Shang Yanjun;Gong Xiaoping;Xu Fengjuan;Aibibaier·Maimaiti(Xinjiang Institute of Engineering,Urumqi,Xinjiang,830091,China;Key Laboratory of Geological Hazard Prevention of Xinjiang,,Urumqi,Xinjiang,830000,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China;Xinjiang University,Urumqi,Xinjiang,830000,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2020年第2期243-248,共6页
Xinjiang Geology
基金
新疆工程学院基金(2018xgy032105)
新疆教育厅“十三五”重点专业地质工程(20161812)
地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2017K021)共同资助。
关键词
岩土体结构
黄土滑坡群
季节性降水
致灾机理
Geotechnical structure
Loess landslide group
Seasonal precipitation
Disaster Mechanism