Soft soil foundation air-water displacement and consolidation method

A soft soil foundation and water replacement technology, applied in infrastructure engineering, soil protection, construction, etc., can solve the problems of long consolidation treatment time, poor drainage and consolidation effect of deep soft soil, etc., and achieve low engineering cost and operation. easy effect

Inactive Publication Date: 2009-11-11
ZHEJIANG UNIV
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Problems solved by technology

[0005] In order to overcome the shortcomings of the current soft soil foundation treatment technology, such as poor drainage and consolidation effect on deep soft soil and long consolidation treatment time, the present invention provides a method fo

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  • Soft soil foundation air-water displacement and consolidation method

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Embodiment Construction

[0012] The principle of the invention is to press gas into the deep part of the soft soil layer, use the high-pressure gas to replace the groundwater in the soft soil foundation, and then quickly exhaust and depressurize the unsaturated soil layer to produce compression deformation. Specifically, firstly, a series of boreholes are drilled on the foundation to be reinforced, and the gas pipeline is inserted, and the air compressor is used to press high-pressure gas into each borehole, and the groundwater in the foundation is replaced by high-pressure gas in the deep soil layer of the soft soil foundation. , so that the foundation soil layer is in an unsaturated state. After the pressure of the high-pressure gas is no longer rising, the air pressure in the soil layer is quickly released to reduce the pressure in the soil layer, so that the unsaturated soil layer is compressed and deformed under the load of the overlying soil layer to achieve reinforcement. Foundation soil. The p...

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Abstract

The invention discloses a soft soil foundation air-water displacement and consolidation method which comprises the following steps of: firstly, drilling a soft soil area requiring reinforcement according to vertical and horizontal layout with the intervals of 5 to 10m; inserting air pipes into boreholes, and connecting the air pipes and cross joint air valves with an air compressors and the air pipes inserted into the boreholes; arranging vertical and horizontal drainage channels between the boreholes; and then pressing air into the boreholes; filling air in the foundation soil layer requiring reinforcement; using air pressure to squeeze out groundwater in the soft soil layer to achieve air-water replacement; when the pressed-in air bursts out from the earth surface, stopping pressing the air into the soil layer and quickly deflating so that non-saturated soil produces compressive deformation under the load action of an overlaying soil layer, thus achieving the aim of reinforcing the foundation soil. By applying the invention, the depth of soft soil foundation drainage consolidation is unrestricted, the engineering cost is low, and project implementation process is simple and convenient, thus quickly producing the reinforcing effect of deep soft soil foundation and being suitable for the reinforcement treatment of complex environment soil foundations including offshore slopes and the like.

Description

technical field [0001] The invention relates to a drainage consolidation technology for soft soil foundations, in particular to an air-water replacement consolidation method for soft soil foundations. Background technique [0002] The soft soil foundation has high natural water content, extremely low strength, high compressibility, poor water permeability, and low foundation bearing capacity. Reinforcement treatment is required before engineering construction can be carried out. The commonly used methods are pile foundation method, soil replacement method, grouting method, drainage consolidation method and reinforcement method. The drainage consolidation method has the characteristics of low cost and little impact on the environment, so it is widely used in the treatment of large-scale soft soil foundations. The drainage consolidation method is composed of a drainage system and a pressurization system. A drainage body is set in the foundation, a sand cushion is laid on the ...

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Application Information

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IPC IPC(8): E02D3/10
Inventor 尚岳全孙红月
Owner ZHEJIANG UNIV
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