Abstract: To analyze the damage state of highway slope under the influence of strong earthquake, a field survey of earthquake damaged slopes in Yangbi earthquake affected area was carried out by UAV scanning. The damage state of typical earthquake damaged slope, that is K70C slope, was quantitatively evaluated by the combination of electrical measurement method and damage theory, and the stability of K70C slope was analyzed by using grid reconstruction technology and finite element simulation. The analysis results show that the instability mode of the slopes along Dayangyun Highway under the influence of Yangbi earthquake is mainly traction type. Based on the difference of the damaged soil state, the K70C slope can be divided into three parts: gravel soil, fractured soil and slate, and the material damage factor threshold is 0.44. According to the strength reduction method, the safety factor of K70C slope after seismic disturbance is 1.105, and the maximum plastic strain is 0.26 in this state and the maximum clearance displacement is 0.83m. There are two plastic deformation zones in K70C slope under the influence of earthquake, which are respectively located at the slope top at the depth from 10 to 20 m and at the back edge of the second-grade slope to the top of the fifth-grade slope. After rainfall infiltration in the rainy season, two landslides occur again in K70C, and the slip characteristics are basically consistent with the results of finite element analysis.

Key words: geotechnical engineering; earthquake; landslide; damage assessment; stability analysis; electrical measurement method

摘要： 为分析强震影响下公路边坡的受损状态，采用无人机对漾濞地震影响区内的震损边坡开展了现场调查。结合电测量法和损伤理论定量地评估了典型震损边坡K70C的损伤状态，并应用网格重构技术和有限元模拟分析了K70C边坡的稳定性。分析结果表明：漾濞地震影响下的大漾云公路沿线震损边坡的失稳模式以牵引式为主；基于土体损伤状态差异，可将K70C边坡划分为碎石土、裂隙土、板岩等3部分，材料损伤因子阈值为0.44；采用强度折减法可知地震扰动后的K70C边坡安全系数为1.105，该状态下的边坡最大塑性应变为0.26，最大临空向位移为0.83 m；K70C边坡在地震影响下内部发育有两个塑性变形区，分别位于边坡顶部深10~20 m处及第2级边坡后缘至第5级边坡坡顶处，经过一个雨季的降雨入渗，K70C再次发生了两次滑坡，滑移特征与有限元分析结果基本一致。

关键词: 岩土工程；地震；滑坡；损伤评估；稳定性分析；电测量法