垃圾土边坡失稳离心模拟试验研究

垃圾围城现象在中国十分明显,其潜在的危害是在极端气候和环境条件下,由于强降雨和渗滤液回灌引起有效应力降低,从而导致填埋体发生滑坡,甚至演化为流滑现象。本文根据中国城市垃圾土的特点,配置了垃圾土试样并制作模型,采用大型土工离心机针对不同龄期的垃圾土边坡在多种工况组合条件下进行了模型试验。为了使模型边坡在高加速度场下达到破坏,开发了变角度模型箱。在离心机转动过程中,通过调整模型箱的角度来增加边坡的坡度,直至垃圾土边坡模型达到破坏。试验过程中同时监测模型变形,通过数据分析,发现了垃圾土边坡变形及失稳的一般性规律。本文同时给出一种离心模拟试验中模型边坡安全储备的估算方法。

Centrifuge modeling of municipal solid waste slope failure

Large portion of municipal solid waste has to be stored in valleys or landfill around cities in China. There is potential risk of slope failure for those solid wastes under rain storm causing high leachate level inside the landfill,sometimes leading to flow slide. Tremendous loss of life and property had been re-ported in the past. This paper presents the centrifuge model tests to simulate the slope failure phenomenon of the municipal solid waste, based on the simulated waste material with higher water content. In order to observe the slope failure for each model test, a rotating container was developed to increase the model slope angle during centrifuge spinning. Solid waste models were tested to failure respectively under different layout with medium and old age of waste storage, with analysis results based on the model slope monitor-ing data and image analyzing method. A useful method is presented in this paper to evaluate the safety po-tential of the initial model slope based on the slope failure information from centrifuge model tests.