强震作用下高填方边坡变形与稳定性研究

Study on Deformation and Stability of High Filled Slopes under Strong Earthquakes

摘要: 强震作用下地基稳定性问题是制约高地震烈度区工程建设的关键性工程地质问题之一。依托西部高原机场巨型高填方工程，根据场地地震条件，以地震危险性概率分析结果为基础，人工合成地震波，并建立有限元数值计算模型，输入人工合成地震波，对高填方边坡不同填方高度、不同地震烈度、不同场地条件、不同放坡坡比条件下的动力响应进行分析。结果表明，填方边坡坡顶地震动响应最剧烈，坡脚次之，中部最弱，且位移和加速度有明显的高程放大效应特征。地震作用下，填方边坡具典型的后发失稳破坏特征，并与地下水工程效应密切相关。研究成果可为高地震烈度区类似工程设计、施工、科研、防灾减灾等提供参考。

Abstract: Foundation stability under strong earthquakes is one of the key engineering geological issues that restrict construction in high seismic intensity areas. Based on the site seismic conditions, based on the results of the seismic hazard probability analysis, artificially synthesize seismic waves, and establish a finite element numerical calculation model, input artificially synthesized seismic waves, and apply different fill heights, different seismic intensities, and different site conditions to high fill slope The dynamic response under different grading ratios is analyzed, relying on the huge high filling project of the western plateau airport. Results show that the response of the top slope of the fill slope is the most severe, the second is the foot of the slope, the middle is the weakest, and the displacement and acceleration have significant elevation amplification effects. The fill slope has typical characteristics of late instability and failure, and is closely related to groundwater engineering effects, under earthquake. The research results can provide references for similar engineering design, construction, scientific research, disaster prevention and mitigation in areas with high earthquake intensity.