渗沥液与载荷作用下陈旧型垃圾填埋场坝体稳定性

Stability of old landfill dams under the action of leachate and load

为研究载荷作用下土的力学参数与渗沥液水位对边坡稳定系数的影响,对广东某填埋场现场勘探取样并进行室内试验,获得垃圾填埋场土力学参数,运用Geostudio软件建立多模块耦合场的有限元模型,对模型施加边界载荷、渗沥液水位等影响垃圾坝体稳定性的较敏感参数,并进行参数敏感性分析,同时模拟条间作用力,建立力学平衡方程,求解垃圾坝的安全系数,得出各个参数对于坝体安全稳定性的敏感度.研究表明:渗沥液水位变化对安全系数的敏感度相对较大.研究结论可对类似垃圾填埋场土石坝的稳定性分析提供参考.

In order to study the influence of soil mechanical parameters and leachate level on slope stability coefficient under load,the soil mechanical parameters and related data of a landfill site in Guangdong were obtained through field exploration sampling and laboratory test.The finite element model was established by coupling each module of Geostudio software,parameters sensitive to the stability of garbage dam body such as boundary load and leachate level were applied,and parameter sensitivity analysis was carried out.At the same time,the safety coefficient of garbage dam was solved by simulating the force between bars and establishing the mechanical balance equation,so as to master the sensitivity of each parameter to the safety and stability of the dam body.The study shows that the sensitivity of leachate water level change to safety factor is relatively large.The stability analysis of this simulation can be used as a reference for the stability analysis of earth-rock dams in landfills in the future.