Collapsible loess foundation treatment method

Abstract

The invention aims to provide a collapsible loess foundation treatment method. A shallow-layer soil body and a deep-layer soil body of the foundation are reinforced, collapsing is eliminated, and then collapsing of the soil bodies is eliminated by adopting a water soaking method. The collapsible loess foundation treatment method includes the steps: 1), using a dynamic compaction method to ram a surface-layer soil body of the foundation; 2), uniformly forming pouring holes; 3), filling a bottom-end soil body for ramming; 4), pouring water and filling aggregate; 5), observing settlement until collapsing deformation is stable. In addition to the above objects, in order to further improve load-bearing capacity of a foundation soil body. The invention further provides another collapsible loess foundation treatment method. The treatment method includes the steps: 1), using a dynamic compaction method to ram a surface-layer soil body of the foundation; 2), uniformly forming pouring holes; 3), filling a bottom-end soil body for ramming; 4), pouring water and filling aggregate; 5), observing settlement until collapsing deformation is stable; 6), rearranging pile position points, and vibrating or hammering to form holes at certain depth; 7), filling fillers and ramming; 8), repeating filling and ramming operation until compaction pile bodies are formed.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to foundation treatment of collapsible loess. Background technique [0002] my country's loess covers a wide area, especially in the northwest region, most of which are collapsible loess foundations. At present, in the treatment of collapsible loess foundation, the commonly used treatment methods include pile foundation penetrating through the collapsible soil layer, cushion replacement method, and lime-soil compaction pile method. However, these methods have certain limitations. For example, the economic efficiency of the pile foundation is poor, the cost is higher when the collapsible soil layer is thicker, and the construction is more difficult. The cushion replacement method is only suitable for areas where groundwater does not occur For buildings with elevated elevations and small loads, the compaction effect of the lime-soil compaction pile method is poor due to the low moist...

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Problems solved by technology

This pre-soaking method has a certain effect on eliminating the collapsibility of loess, but there are some difficulties in its construction that are difficult to overcome. First, the soil in the soaking hole is easy to collapse and form silt when it encounters water, which hinders the process of soil immersion. , affecting the water-soaking and consolidation effect of the soil; second, there is no pressure on the deep soil below the surface; third, all the water in the site and the evaporation time is too long, which makes it difficult to accurately observe the settlement of the subsidence and follow-up construction; Fourth, the loess subsidence is only eliminated, and the bearing capacity of the foundation cannot meet the load requirements of the building

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