老填埋场改扩建中的关键环境岩土技术问题

Key geotechnical problems in the reconstruction and expansion of existing MSW landfills

老填埋场由于采用简易填埋方式和传统填埋作业工艺,对区域土壤、地下水、地表水、大气都存在不同程度的环境污染问题。本文通过对国内外老填埋场改扩建工程的总结分析,指出垃圾堆体稳定、垃圾沉降、渗沥液迁移扩散问题是老填埋场改扩建中的关键岩土技术问题。垃圾堆体稳定主要涵盖新老垃圾堆体的局部稳定、整体稳定、接触面稳定问题,垃圾沉降包括过大沉降和不均匀沉降问题,渗沥液迁移扩散包括填埋场渗沥液迁移分析和地下水污染防治等问题。针对这三大问题,对其机理成因、模型方法、扩建工程措施、老场改建措施等方面进行归纳总结,结合具体工程对这些问题的研究成果进行综述,并从工程技术角度提出了初步解决方案,明确了需要进一步解决和研究的问题,为今后国内填埋场的改扩建指明了发展方向和技术改进途径。

Due to the utilization of simple fill methods and conventional operation techniques in the construction of landfills in the past, the environmental pollution of soil, groundwater, surface water and the atmosphere is a common problem for existing landfills. Through summarizing and analyzing some of the existing Municipal Solid Waste landfills both at home and abroad, it is found that landfill stability, MSW settlement, and leachate migration and diffusion pose key geotechnical problems to the reconstruction and expansion of existing MSW landfills. Correspondingly, the mechanisms, modeling methodologies, parameters, and engineering measures are summarized, the relevant research results and their applications are overviewed, and directions for further research are pointed out.