Post-grouting capped rigid pile and drainage unit combined foundation treatment technology

Abstract

Disclosed is a post-grouting capped rigid pile and drainage unit combined foundation treatment technology. The post-grouting capped rigid pile and drainage unit combined foundation treatment technology comprises paving horizontal drainage units on the surface of a soft foundation and constructing vertical drainage units inside the foundation, wherein the horizontal drainage units and the horizontal drainage units are communicated to form drainage channels; constructing rigid piles inside the soft foundation, arranging grouting bags and reinforced concrete pile caps at the tops of the piles to form a controllable support system. When being filled with water and stabilized, the grouting bags can be extruded under the action of upper load to drain water and retract, the load born by the rigid pile can be relatively low, and after water drainage and solidification under the action of the upper load, the bearing capacity of foundation soil can be improved; when the grouting bags are filled with grout and solidified, the rigid piles, the grout and the pile caps form rigid support to bear more upper load and accordingly to reduce the loading pressure of the foundation soil. The post-grouting capped rigid pile and drainage unit combined foundation treatment technology can give full play to the bearing capacity of the foundation soil and reduce the consumption of the rigid pile to reduce the economic input, and meanwhile, can effectively control afterward settlement of a project to reduce upper structural deformation and damage due to overlarge settlement.

Description

technical field [0001] The invention relates to a soft soil foundation reinforcement treatment technology, which can be applied to foundation reinforcement and settlement prevention and control of highways, railways, earth-rock dams, house construction and other projects. Background technique [0002] Soft soil has the characteristics of high water content, large void ratio and low shear strength. To build roads, railways, earth-rock dams, housing construction and other projects on soft soil foundation, it is necessary to improve the bearing capacity of soft soil foundation and control its settlement. At present, there are many reinforcement treatment techniques for soft soil foundations, such as drainage consolidation method, capped rigid pile composite foundation method, etc. [0003] The drainage consolidation method sets drainage bodies inside and on the surface of the soft soil layer to dissipate the pore water pressure of the soil and increase the effective stress of ...

AI Technical Summary

Problems solved by technology

However, the load-bearing properties of the composite foundation are basically controlled by rigid piles, and the bearing capacity of the soil between the piles cannot be fully utilized. At the same time, the amount of rigid piles is large, which is uneconomical.

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