含软弱夹层缓倾堆积层滑坡变形特征与失稳机制研究  

STUDY ON THE DEFORMATION CHARACTERISTICS AND DESTABILIZATION MECHANISM OF LANDSLIDES WITH WEAKLY INTERBEDDED SLOW-DIPPING ACCUMULATION LAYER

作　　者：杨云飞 许万忠[1] 郭英航 王性昊 杨子萱 郑洁茹 YANG Yun-fei;XU Wan-zhong;GUO Ying-hang;WANG Xing-hao;YANG Zi-xuan;ZHENG Jie-ru(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Xinjiang Headquarters of China Construction Materials Industry Geological Survey Center,Urumqi 830002,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]中国建筑材料工业地质勘察中心新疆总队,乌鲁木齐830002

出　　处：《地质灾害与环境保护》2024年第4期6-15,共10页Journal of Geological Hazards and Environment Preservation

基　　金：国家自然科学基金项目(41562016)。

摘　　要：以重庆市头渡镇柏枝溪滑坡为例,利用钻孔、工程测量、无人机摄影测量技术、现场试验及取样试验等手段,结合现场监测和Midas-GTS数值模拟软件,将变形破坏特征与数值模拟结果相互印证,详细分析该滑坡的变形特征、成因机制及潜在稳定性。柏枝溪滑坡分为1^(#)滑坡和2^(#)滑坡,结果表明:(1)绝对位移监测得出柏枝溪滑坡的失稳与降雨密不可分;(2)钻孔和深部位移监测揭示柏枝溪1^(#)滑坡为大型中-深层堆积层滑坡,2^(#)滑坡为中型浅层堆积层滑坡;(3)数值模拟结果显示柏枝溪滑坡在天然和暴雨工况下分别处于基本稳定和欠稳定状态,极易沿软弱夹层进行滑移破坏;(4)柏枝溪滑坡的形成与地形地貌、地层岩性、坡体结构、人工活动、大气降水等因素具有一定的相关性,但软弱夹层和降雨是该滑坡在平缓地区发生滑移的主要因素。Taking the Baizhixi landslide in Toudu Town, Chongqing City as an example, combined with on-site monitoring and Midas-GTS numerical simulation software, this paper analyzes the deformation characteristics, genetic mechanism and potential stability of the landslide in detail by means of engineering measurements, UAV photogrammetry technology, drilling, field tests and sampling tests. The deformation and damage characteristics are corroborated with numerical simulation results. The Baizhixi landslide can be divided into 1^(#) landslide and 2^(#) landslide. The results show that:(1) the absolute displacement monitoring yields that the destabilization of the Baizhixi landslide is inextricably linked to rainfall;(2) the drilling and deep displacement monitoring reveals that 1^(#) landslide is a large-scale middle-deep accumulation landslide, and 2^(#) landslide is a medium-sized shallow accumulation landslide;(3) the numerical simulation results show that the Baizhixi landslide is basically stable and unstable under natural and heavy rainfall conditions, respectively, and is highly susceptible to slip damage along the weak interlayer;(4) the formation of the Baizhixi landslide has a certain correlation with topography, stratum lithology, slope structure, human activities, and atmospheric precipitation and other factors, but the weak interlayer and rainfall are the main factors of the landslide in the low relief area. This paper adopts various means to analyze the deformation characteristics and instability mechanism of the Baizhixi landslide in a comprehensive way, which can provide useful reference for the early identification and instability mechanism study of this kind of gently inclined accumulation landslides.

关 键 词：堆积层滑坡 软弱夹层 变形特征 Midas-GTS 失稳机制 

分 类 号：P642.22[天文地球—工程地质学]