Subgrade filling method for physical improvement of fine silt

Abstract

The invention relates to a subgrade filling method for physical improvement of fine silt, which is characterized by comprising the following steps: cleaning ground, setting gravel blind ditches, filling enveloping soil, heaping up edges with sand bags, paving and leveling sand, controlling water content, rolling, filling a top seal layer, and embedding settlement plates and displacement observation piles respectively in characteristic sections of a sand-filled subgrade as required to carry out sedimentation and displacement observation of the sand subgrade. The application of the constructionprocess has good economic and social effects. On one hand, the price of fine sand is relatively low, and the fine sand has the characteristics of good water stability, uniform settlement, and little influence from water and unfavorable seasons during construction, and the construction period can be greatly shortened during construction; on the other hand, the successful application of the processcan avoid damage to local resources and environment when soil is borrowed, can dredge a channel and protect the ecology. In some areas restricted by natural geological conditions, fine silt can be used as subgrade filler, and by adopting the scheme, basic requirements for subgrade construction can be met.

Description

Technical field [0001] The invention relates to the technical field of building construction, in particular to a roadbed filling method with physical improvement of fine silt sand. Background technique [0002] The stability of high-speed railway subgrade is an important issue of concern in the industry. Due to the quality control indicators of high-speed railway subgrade materials and original materials at the bottom of the subgrade, the entire construction and road operation process will be affected by environmental moisture, temperature, and load. Factors change, so the physical properties of the high-speed railway foundation filler itself (particle gradation, weathering degree and moisture content, etc.), construction technology and construction quality control indicators are uncertain, resulting in different fillers for the high-speed railway subgrade The life of the roadbed has a great influence. [0003] However, due to the restriction of natural geological conditions in so...

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Problems solved by technology

[0003] However, due to the limitation of natural geological conditions in some areas, some lines need to pass through unfavorable engineering geological areas dominated by silt and fine sand

Due to the large content of sand and small content of clay in silty fine sand, it is not easy to form a plate body, it is easy to liquefy after being soaked in water and shaken, it is loose when dry, and its cohesiveness and plasticity are very small. Conventional construction methods cannot meet the basic requirements of roadbed construction.

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