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近10年的运营经验表明,国内南方地区第1批建造的山谷型垃圾填埋场中的渗滤液水位一般较高。同时,现有研究表明,降雨入渗引起渗滤液水位过高是垃圾填埋场失稳的主要诱因之一。因此,研究强降雨条件下山谷型垃圾填埋场的水分运移规律及其稳定性,具有重要的现实意义。基于七子山填埋场浅层、中层和深层垃圾土的土-水特征曲线和Brooks-Corey公式,利用非线性拟合技术得到垃圾土的渗透性函数;运用饱和-非饱和渗流理论,对递减型、中心型、增强型和平均型4种降雨模式下七子山填埋场的水分运移进行了数值计算;利用极限平衡理论,对不同降雨模式下七子山填埋场的稳定性进行了分析。结果表明,降雨模式对山谷型垃圾填埋场内的水分运移规律和填埋场的稳定性有显著的影响,递减型降雨模式下填埋场内孔隙水压的变化最大,同时填埋场稳定系数也下降最为明显,为最不利降雨模式;经历7 d 746 mm的极端强降雨后,七子山填埋场具有极大的失稳隐患。
Nearly 10 years of operating experience shows that the leachate level in the first batch of landfill landfills built in the southern part of China is generally high. At the same time, the existing studies show that the leachate infiltration caused by excessive water level is one of the main incentives for landfill instability. Therefore, it is of great practical significance to study the law of water transport and its stability in valley-type landfills under heavy rainfall conditions. Based on the soil-water characteristic curve and Brooks-Corey formula of shallow, middle and deep rubbish soil in Qixi Mountain Landfill, the permeability function of rubbish soil was obtained by nonlinear fitting technique. By using the theory of saturated-unsaturated seepage, Type, central type, enhanced type and average type four rainfall models were used to calculate the water transport in Qizi Mountain landfill. The stability of Qizi Mountain landfill under different rainfall patterns was analyzed by using the limit equilibrium theory . The results show that rainfall pattern has a significant effect on the law of water transport and landfill stability in valley landfill. The change of pore water pressure in landfill under the decreasing rainfall pattern is the largest, The stability coefficient also dropped most obviously, which was the most unfavorable rainfall pattern. After experiencing severe rainfall of 7 days and 746 mm, Qizi Mountain landfill had great potential for instability.