长期服役垃圾填埋场堆体稳定性动态评估

Dynamic Evaluation on Stability of Rubbish Dumps for Landfills in Long-Term Service

国内垃圾填埋场大多已处于长期服役状态,依据实时监测数据动态评估垃圾堆体稳定性,计算当日垃圾合理进场量与堆填位置,对填埋场日常安全运营具有重要的指导意义。以国内某长期运营垃圾填埋场为工程背景,采用极限平衡方法,计算分析了渗沥液存在形式、液面高度、垃圾堆填高度及位置对垃圾堆体边坡稳定性的影响,得到警戒水位高程、极限垃圾堆填高度和日均垃圾进场量。结果表明:渗沥液液面高程、新进场垃圾堆填高度双因素与安全系数间呈线性关系。应合理布置新进场垃圾堆填位置,不得过于靠近坡底,并及时推平新进场垃圾以控制堆填高度。为保证填埋场的长期稳定性,应及时检查填埋场的导排系统,确保其畅通。

Most landfills in China are in a long-term service state. Dynamic evaluation on stability of garbage dumps based on real-time monitoring data is of important guiding significance for daily safe operation of landfills. The limit equilibrium method was used to calculate and analyze influences of the existing form of leachate, the liquid level of leachate and the height and position of new rubbish dumps on the stability of landfills. The results showed that the safety factor had a linear relation with the luquid level and the height of the new rubbish dump. The position of the new rubbish dump should be reasonably arranged, which could not be arranged too close to bottoms of landfills and the new rubbish dump should be bulldozed in time to lower the landfill height. In order to ensure the long-term stability of landfills, the drainage system in landfills should be checked in time.