城市垃圾填埋场地震稳定分析及永久位移计算

摘要

根据城市生活垃圾室内外试验结果，提出了确定浸润线自由面的方法．通过静力和动力有限元计算，对某填埋场边坡进行稳定分析，给出了在地震过程中每一小时段的稳定安全系数．结果表明，在地震过程中，最危险滑动面的位置比较稳定；在此基础上，对Newmark方法进行了改进，使之建立在比较“精确”的基础上，得到了填埋场在地震作用下的永久位移，对填埋场的抗震设计具有重要的指导意义．这一方法对一般坝体的工程抗震也有很大的参考价值．%According to the results of experiments on the municipal solid waste (MSW), a series of formula are deduced to calculate the leachate free-faced headline curve. By means of static and dynamic FEM, the stability of a wasteland during earthquakes is analyzed. It is demonstrated that the positions of the most dangerous sliding surfaces during earthquakes are fairly stable. Based on the above findings, this paper developed the Newmark method by increasing the precision to reckon the permanent deformation of wastelands during earthquakes. The method presented in the paper is not only of great importance to instruct the anti-seismic design of wasteland, but also valuable to the design of ordinary dams and embankments.