Prevention of Geo-Environmental Disasters caused by the Wastes

本课题从环境岩土工程学的角度出发，对岩土加固法处理废弃物进行了研究。考虑到废物产生的现状，建筑业消耗了大量资源，而废物处置场地有限。因此，从资源利用和环境保护的角度来看，需要回收废物。主要研究结果如下：1.对流化床燃煤飞灰、不锈钢渣和城市生活垃圾焚烧飞灰的稳定化方法进行了评价。试验研究表明，粉煤灰和矿渣可以作为土工材料利用，水泥和粉煤灰作为稳定剂的复合使用可以实现城市生活垃圾焚烧飞灰的稳定化。提出了一种废泥浆脱水或固化的综合利用体系，并发现泥浆的密度和粘度可以作为泥浆脱水或固化回收利用的指标。3.提出了一种新的废石粉利用技术方法--袋装WRP法。袋装WRP比岩石或混凝土块体更有利于沉管堤坝的建设，可以有效地应用于堤坝建设和伴随的人工滩涂建设，以缓解环境污染。4.研究了水泥稳定剩余土土工再生对环境的影响。通过试验研究了稳定土的碱迁移特性，提出了控制碱迁移的设计思想。

The subject of this research is on the utilization of waste materials through geotechnical stabilization method from the aspect of environmental geotechnology. Considering the present state on waste generation, a large amount of resources are consumed for the construction industry, while the waste disposal site has been limited. To recycle wastes is therefore required from the viewpoint of resource utilization and environmental preservation. The main results obtained are as follows ;1.The stabilization method for geotechnical waste utilization is evaluated on fluidized bed combustion coal fly ash, stainless-steel slag and municipal solid waste incinerated fly ash. Experimental studies clarifies that the coal ash and the slag can be utilized as geo-materials, and multiple use of cement and the coal ash as stabilizer can realize the stabilization of municipal solid waste incinerated fly ash.2.The utilization of waste sludge discharged from construction works is also evaluated. A system utilizing waste slurry which consists of dehydration or solidification is proposed, and it was found that density and viscosity of the slurry can be used as indexes of the criteria whether a slurry should be best treated by dehydration or solidification for recycling use.3.A new technical method, "Bagged WRP Method, " for utilizing waste rock powder is proposed. The Bagged WRP is more advantageous to the sunk-levee construction than the rock or concrete block because of its light weight, and can be effectively applied for levee construction and accompanied man-made tidal flat construction for environmental mitigation.4.The environmental impackt caused by the geotechnical recycling of surplus soil stabilized by cement is examined. Alkali migration characteristics from the tabilized soil is experimentally evaluated and the design concept forthe alkaline migration control is proposed.