Rubbish landfill site intermediate covering layer and preparation method and application thereof

Abstract

The invention discloses a rubbish landfill site intermediate covering layer and a preparation method and application for the rubbish landfill site intermediate covering layer and belongs to the technical field of rubbish landfill. The intermediate covering layer comprises at least three layers of function layers arranged in a stacked manner, each function layer comprises a water storage layer, a discharge guiding layer and a low permeability layer from outside to inside in sequence, the water storage layers are mainly composed of recycled fine aggregate with the particle size being less than 5mm, the discharge guiding layers are mainly composed of recycled coarse aggregate with the particle size being 10-40 mm, the low permeability layers are mainly composed of renewable powder with the particle size being less than 2 mm, and the recycled fine aggregate, the recycled coarse aggregate and the renewable powder are all obtained by processing building rubbish. By means of the intermediatecovering layer, mechanical properties of a rubbish body are improved, and the intermediate covering layer provides a certain degree of anti-permeability and air-tight function serving as temporary covering, because used materials are all landfill building rubbish in landfill sites, 'filling rubbish with rubbish', recycling utilization of the building rubbish is realized, and the rubbish landfillsite intermediate covering layer and the preparation method and application for the rubbish landfill site intermediate covering layer have the characteristics of being convenient to draw materials, low in cost, capable of saving energy, environmentally friendly, good in durability and the like.

Description

technical field [0001] The invention relates to the technical field of garbage landfill, in particular to an intermediate covering layer of garbage landfill and its preparation method and application. Background technique [0002] In recent years, with the sustained and rapid development of my country's national economy and the acceleration of urbanization, urban solid waste has increased dramatically. The treatment methods of municipal solid waste are mainly divided into landfill, incineration and composting. Among them, landfill is the main way of waste disposal in my country at this stage. [0003] For the landfill method, the landfill is a bulky geotechnical structure, and its instability will cause a large amount of leakage of garbage and leachate, seriously pollute the surrounding environment, and cause irreparable losses. Therefore, the mechanical stability of landfill waste has attracted much attention. [0004] Generally speaking, the main factors affecting the m...

AI Technical Summary

Problems solved by technology

Therefore, the existence of the soil intermediate covering layer will greatly limit the slope and height of the landfill waste body, thereby reducing the amount of waste landfill per unit area, thereby reducing the storage capacity of the landfill site

[0012] (2) Occupying the storage capacity of the landfill

[0013] (3) Consumption of soil resources

Considering that layered paving and compaction are required during the landfill operation of the waste landfill, an intermediate covering layer needs to be laid after the construction of each stage of the operation layer is completed, and several intermediate covering layers are required when the entire landfill is closed. This will consume a huge amount of soil resources, especially for many areas where clay resources are not abundant, which will undoubtedly cause difficulties in obtaining materials and exacerbate the shortage of soil resources

[0014] (4) Affecting construction

According to domestic production experience, when the traditional soil intermediate covering layer is used, especially clay is used as the intermediate covering layer material, in the subsequent construction process, a large amount of soil will be bonded to the compaction equipment, which will affect the compaction operation

In addition, because the strength of the soil intermediate cover layer is too low, large and medium-sized construction machinery cannot pass normally on the soil intermediate cover layer during the next stage of landfill process, causing construction difficulties

[0015] (5) Poor economy

The use of soil intermediate cover requires a large amount of transportation and deployment of soil resources from outside, which increases the material cost; on the other hand, the soil intermediate cover will occupy the storage capacity of the landfill, reducing the actual amount of landfill waste; The intermediate covering layer will affect the construction progress, etc., and the above factors will reduce the economic benefits of the landfill

[0016] From the above analysis, it can be seen that the traditional soil intermediate cover restricts the mechanical stability of landfill waste due to its poor mechanical properties of construction materials, thereby limiting the storage capacity of the landfill and reducing the economic and social benefits of the landfill.

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