Construction method for sand-filling subgrade

Abstract

The invention relates to the field of constructional engineering, and particularly relates to a construction method for a sand-filling subgrade. The construction method for the sand-filling subgrade is characterized by comprising the following steps: clearing the subgrade, setting a drainage system, embedding a settlement and displacement observing device, starting paving, testing degree of compaction, and constructing a top-sealing layer. The construction method has the advantages of using high permeability characteristic of fine sand of Yangtze estuary to reasonably control construction moisture content for replacing high-quality soil as subgrade filler; using clay waste formed by processing subgrade substrate to fill an edge-covered soil structure and carrying out greening on the edge-covered soil structure; using a synchronous construction method for edge-covered soil and fine sand to ensure good connection and integral stability of the fine sand and the edge-covered soil; and effectively controlling and protecting the construction progress and the surrounding environment and reducing reduce the corresponding engineering cost.

Description

technical field [0001] The invention relates to the field of construction engineering, in particular to a construction method of a sand-filled roadbed. Background technique [0002] It is a traditional practice in road construction to use high-quality soil as roadbed filler. Areas such as Shanghai with dense water networks and low terrain are alluvial plain areas, and there is a serious shortage of high-quality fillers. If soil is taken from nearby farmland and improved as roadbed filling, a large amount of high-quality cultivated land will be destroyed, causing a series of environmental and social problems; if soil is transported from other places for a long distance, it will inevitably increase the cost of road construction. Therefore, it is an urgent need to find new roadbed fillers for road construction in this area. [0003] With the rapid development of transportation infrastructure, domestic high-grade highway construction has begun to try to use fine sand from the ...

AI Technical Summary

Problems solved by technology

However, there is a big gap between fine sand and aeolian sand in the Yangtze River Estuary, and conventional medium and coarse river sand in terms of packing properties and road performance, so they cannot be copied at will.

The engineering cases of subgrade filling with fine sand in the Yangtze River Estuary are also extremely limited, and there is a lack of effective practical experience for reference, resulting in great uncertainty and risk in design and construction.

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