中文摘要：

填埋场的稳定性决定着填埋场的使用年限和填埋废弃物的数量。上海老港填埋场的5～8号库区填埋的为固化污泥,周围以垃圾土坝围护。在对老港填埋场稳定性进行分析时,没有采用常用的极限平衡法,而是采用FLAC3D软件对填埋场进行了三维数值模拟分析。根据现场和室内试验得到的各类土的物理力学性能指标数据,在模拟过程只考虑自重应力,得到了填埋场的应力和位移情况以及安全系数。模拟结果表明：①库区的潜在滑动面在垃圾土坝底面的一定范围内,垃圾坝正好处在滑移面以上;②垃圾土坝的坝底和坝顶的位移相对较大;③垃圾坝的稳定性较好,FLAC3D计算的安全系数为2.72。通过对比可以看出,FLAC3D在分析稳定性方面具有一定的优势,能够克服传统方法在分析类似填埋场稳定性的局限性。

英文摘要：

The stability of the landfill decides its service life and the quantity of waste which it could contain.The NO.5 to 8 reservoir regions of Shanghai Laogang landfill,which are enclosed by gravity waste dam,are filled with sewage sludge which had already been solidified.The limit equilibrium method was not used during the process of the calculation,and the stability of the landfill was simulated and analyzed on the three dimension by using FD software,FLAC3D,with the indexes of physical and mechanical properties of soil extracted from the field tests and indoor tests.During the numerical simulation,gravity stress was only taken into account.According to the simulation,the stress and displacement diagrams were yielded.The results of the numerical simulation showed that latent sliding surface is under the waste dam,and the dam is just above the latent sliding surface.The displacement values of the dam top and dam base are large.The results also showed that the stability of the waste dam is good,and the FOS is 2.72 according to the results of simulation.By comparison analysis,it could be concluded that the limitations could be overcome by the usage of FLAC3D when the similar landfills＇ stability is analyzed.The software,FLAC3D,has its own advantages.