摘要
地处天山山脉西段季节性冻土广泛发育的伊犁谷地是我国黄土滑坡灾害严重地区之一,前人在多年冻土区进行了大量冻融模型与冻融灾害机理的研究。伊犁谷地初春气温在-10℃至10℃,季节性冻土区经长期反复冻融循环作用如何使土体强度降低、坡体内水位升高,导致斜坡变形、失稳、破坏,冻土分布范围扩大诱发滑坡等致灾过程研究还需深入。以喀拉吐木苏克滑坡为例,笔者等在以往工程地质勘察工作基础上,分析滑坡形成地质条件、滑坡体形态、结构及危险性,总结出喀拉吐木苏克滑坡变形、失稳、破坏模式为:冻结弱化→冰雪消融、土体蠕变→土体强度劣化、斜坡变形、失稳→强度劣化累积、坡体滑动的过程。与季节性冻土破坏模式相比,本区滑坡致灾因素复杂多样,在冻融循环作用下强度劣化累积效应易被工程人员忽视。
The Yili Valley is located in the westem section of the Tianshan Mountains.It is one of the most serious landslide disaster areas in China.Seasonal freeze-thaw action leads to slope deformation,instability,and damage.Numbers of freeze-thaw models and the mechanism of freeze-thaw disasters have been studied in permafrost regions.In early spring the long-term repeated feezing-thawing cycles in the seasonal frozen soil area reduced the strength of the soil and raised the water level in the slope body caused the slope deformation,instability and destruction in the range of -10℃ to 10℃ temperature difference,the study on the disaster-causing process such as landslide induced by the expansion of the distribution of frozen soil needs further study.Taking the Kalatumusuke landslide as an example,the authors on the basis of the previous enginering geological investigation work,analyzed the geological conditions for the formation of the landslide,the shape,structure and danger of the landslide body,it is concluded that the deformation,instability and failure modes of Kalatumusuke landslide are follows:feezing weakening→melting of ice and snow,soil creep→detenioration of soil strength,slope deformation,instability-accumulation of strength deterioration,and slope sliding.Compared with other failure modes of seasonal frozen soil,the factors causing landslides in this area are complex and various,and the cumulative efect of strength deterioration under the action of freeze-thaw cycles is easy to be ignored by engineers,this study provides a reference for the study of the disaster-causing process of the loess landslide in the seasonal frozen area,and also provides a basis for the early idenification,risk prediction and engineering prevention of the land-slide.
作者
曹小红
吴彬
尚彦军
许涛
艾比拜尔·买买提
Cao Xiaohong;Wu Bin;Shang Yanjun;Xu Tao;AiBiBaier Maimaiti(Xinjiang Agricultural University,Urumqi,Xinjiang,830000,China;Xinjiang Key Laboratory of Geological Hazard Prevention(Xinjiang Institute of Engineering,Urumqi,Xinjiang),Urumqi,Xinjiang,830000,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China)
出处
《新疆地质》
CAS
CSCD
2022年第4期502-506,共5页
Xinjiang Geology
基金
新疆维吾尔自治区自然科学基金资助项目(2022D01A239)
新疆维吾尔自治区重点研发专项(2022B03001-2)
新疆地质灾防治重点实验室开放基金联合资助。
作者简介
第一作者:曹小红(1985-),女,新疆阿克苏人,在读博士,2012年毕业于兰州大学地质工程专业,从事地质灾害防治与地质环境保护教学、研究工作,E-mail:cxhong15@163.com;通讯作者:吴彬(1972-),男,博士,教授,博士生导师,从事水文水资源工程、工程地质教学及科研工作。
