Method for treating soft soil roadbed by artificial composite crust layer

Abstract

The invention discloses a method for processing a soft roadbed through artificial composite crusts, including the following steps: first, constructing micro-piles; second, constructing a construction waste cushion layer; third, constructing pile caps and paving steel-plastic geotechnical grilles; fourth, filling and building a soillime layer; fifth, filling and building a compact clay-doped construction waste layer; and sixth, filling and building a road embankment. The micro-piles is connected with a plastic or hard plastic claypan and a soft plastic claypan; pile caps are arranged on the piles and the steel-plastic geotechnical grilles are connected on the pile caps; the undersides of the steel-plastic geotechnical grilles are connected with the construction waste cushion layer, and the upsides are connected with the soillime layer; and the soillime layer is connected with the compact clay-doped construction waste layer which is finally connected with the road embankment. The method reduces construction cost and environment pollution, realizes utilization of a large amount of construction waste, and remarkably improves the bearing strength and uneven settlement resistance of soft roadbeds. The method is also applicable for soft roadbed treatment in large area in other municipal projects.

Description

technical field [0001] The invention relates to the technical field of soft soil roadbed treatment, and more particularly relates to a method for treating soft soil roadbed with an artificial composite hard shell layer. Background technique [0002] The treatment of soft soil roadbed is a common technical problem in infrastructure construction. At present, three solutions are generally adopted, namely, bridge passing, soft soil replacement and foundation treatment. Because the first two methods are expensive or not conducive to environmental protection, soft soil subgrade Soil subgrade treatment has become a relatively economical and reliable method, but the treatment cost still accounts for a considerable proportion of the total project cost, and the treatment technology and benefits still need to be improved. Currently, the commonly used methods in soft soil subgrade treatment are drainage treatment method, Such as bagged sand well and plastic drainage board method, there ...

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Problems solved by technology

[0002] The treatment of soft soil roadbed is a common technical problem in infrastructure construction. At present, three solutions are generally adopted, namely, bridge passing, soft soil replacement and foundation treatment. Because the first two methods are expensive or not conducive to environmental protection, soft soil subgrade Soil subgrade treatment has become a relatively economical and reliable method, but the treatment cost still accounts for a considerable proportion of the total project cost, and the treatment technology and benefits still need to be improved. Currently, the commonly used methods in soft soil subgrade treatment are drainage treatment method, Such as bagged sand well and plastic drainage board method, there are composite foundation treatment methods, such as cement, fly ash and quicklime mixing pile method, compacted gravel (or sand) pile, compacted lime (or fly ash) pile method, etc.

Among these commonly used methods, bagged sand wells and plastic drainage board methods are suitable for soft soil subgrades with large soft soil thickness, and have the advantages of convenient construction, high efficiency, and low cost, but they are not suitable for low-permeability soft soil subgrades, and There are problems of long construction period and large post-construction settlement; cement, fly ash and quicklime mixing pile method has reliable treatment effect, but requires a large number of piles and complicated construction technology, which is only suitable for soft soil subgrade with shallow buried depth. And the cost is high, and the construction has a great impact on the surrounding environment; the treatment effect of compacted gravel (or sand) piles and compacted lime (or lime) piles is also relatively good, but the construction process is complicated and the cost is high. Poor sex

[0003] The use of the bearing potential of the natural hard crust of the soft soil subgrade has attracted attention, and has a good development prospect, while the artificial hard crust can be used for the soft soil subgrade without natural hard crust or thinner, but most of them are currently in the In the experimental research stage, the method is limited to lime soil and geogrid, etc.

In addition, the existing soft soil subgrade treatment methods involve little in environmental protection, among which the utilization of construction waste with an annual output of more than 100 million tons, which brings huge environmental pressure, is almost zero. There are only a few methods, and the amount of utilization is very small, and the treatment method of using construction waste to form an artificial hard shell has not yet been proposed

[0004] To sum up, it can be seen that the currently commonly used soft soil treatment methods have limitations in application to varying degrees. Some methods are relatively expensive, and there are too few designs and applications in environmental protection and waste utilization. Therefore, a new method is developed. The artificial composite hard shell treatment method can reduce construction costs, improve the utilization rate of construction waste and reduce environmental pollution, resulting in good economic and environmental benefits

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