垃圾填埋场的环境土工问题

Geoenvironmental Problems on Landfills of Municipal Solid Waste

垃圾填埋场是一种具有衬垫和气液收集系统的特殊土工构筑物。城市生活垃圾是一种特殊的土,其颗粒大、成份复杂,填埋体内温度高;渗滤液的溶质对吸力产生影响;垃圾的压缩性与降解有关,而垃圾的强度受纤维状"加筋"相的影响;渗滤液的渗漏引起土体和地下水的污染,污染物迁移包括对流、扩散和吸附三种方式;填埋体的沉降和稳定性还要考虑固—液—气—热多场耦合作用,吸力作用有待进一步研究。

Landfill of municipal solid waste （MSW） is a special kind of geotechnical structures constructed with linear system and collection system for gas and leachate. The characteristics of MSW is different from other soils, because of its great grains, complicated components and high temperature. The osmotic suction is influenced by the solute of leaehate. The compression of MSW is influenced by the bio-degradation, while its strength is influenced by the reinforcements of the fiber materials. Soil and ground water are easily contaminated the leakage of leachate, in which three different transport types of contaminants includes： the rules of advection, diffusion and adsorption. The influence of multi field coupling action of solid, gas, liquid, and thermo should be considered for the settlement calculation and stability analysis and the influence of the suction should be further studied.