地震及降雨交互作用下典型路堑滑坡特征及其诱发机制——以云南漾濞6.4级地震为例  

Characteristics and Inducing Mechanism of Typical Cutting Landslides under the Interaction of Earthquake and Rainfall--Taking Yunnan Yangbi Ms 6.4 Earthquake as an Example

作　　者：冯宇 向亚文 张志权 海同 袁刚烈 FENG Yu;XIANG Yawen;ZHANG Zhiquan;HAI Tong;YUAN Ganglie(Anneng Chongqing Construction Development Co.,Ltd,Chongqing 401329,China;School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]中国安能集团第三工程局有限公司重庆分公司,重庆401329 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《安徽工业大学学报（自然科学版）》2024年第2期195-203,共9页Journal of Anhui University of Technology（Natural Science）

基　　金：国家自然科学基金重点项目(42330704)。

摘　　要：以在建大理-漾濞-云耳高速公路工程为背景,针对2021年6.4级漾濞地震下典型路堑滑坡,采用电测量及无人机航测等方法对路堑滑坡灾害特征开展现场调查及测试;结合室内模拟试验建立的土体电参数与损伤因子的相关性,通过关系映射评估路堑边坡损伤演化规律,探究地震典型路堑滑坡特征及其诱发机制。结果表明:开挖扰动会增加地震滑坡风险,地震作用下路堑边坡开挖面的顶部形成贯通主裂缝,最大宽度及深度可达3~4 m;路堑滑坡致灾程度受到地震烈度及支护措施的影响,随地震烈度的降低,裂缝宽度及深度呈减小趋势,支护措施的增加可显著降低边坡的滑移风险;震损边坡在降雨渗流作用下,沿裂缝深度方向土体损伤度进一步升高,后缘面区域损伤因子大于0.36,裂缝宽度从2.9 m快速增至8.0 m。综上,支护不足、地震烈度与边坡受损程度呈正相关,未支护边坡受到地震的影响较大;地震与降雨作用之间存在互促效应,降雨会极大影响震损边坡的稳定性。Taking slopes along Dali–Yangbi–Yuner highway under construction as the research target,in response to the typical cut slope landslides caused by the 6.4 magnitude Yangbi earthquake in 2021,some methods such as electrical measurements and drones were used to conduct field investigation and test the characteristics of the cut slope landslide disasters.Based on the correlation between soil electrical parameters and damage factors established by indoor simulation experiments,the damage evolution law of cutting slopes was evaluated through relationship mapping,and the characteristics and inducing mechanism of typical cutting landslides caused by earthquakes were explored.The results show that slope excavation increases the risk of earthquake-induced landslides.Under the action of earthquakes,a through-going main crack forms at the top of the excavated surface of the road cut slope,with a maximum width and depth of 3-4 m.The degree of disaster caused by road cut landslides is influenced by seismic intensity and slope support.With the decrease of seismic intensity,the width and depth of cracks show a decrease trend.The increase of support measures can significantly reduce the risk of slope sliding.Under the influence of rainfall seepage,the soil damage degree of the earthquake damaged slope further increases along the depth direction of the crack.The damage factor in the trailing edge area is greater than 0.36,and the crack width rapidly increases from 2.9 m to 8.0 m.In summary,there is a positive correlation between insufficient support,seismic intensity,and the degree of slope damage,the unsupported slopes are significantly affected by earthquakes.There is a mutual promotion effect between earthquake and rainfall,and rainfall can greatly affect the stability of earthquake damaged slopes.

关 键 词：漾濞6.4级地震 震后降雨 路堑滑坡 损伤演化 诱发机制 电测量 

分 类 号：TU411.01[建筑科学—岩土工程]