Method of reinforcing soft soil foundation by gas extrusion drainage and used gasbag
A soft soil foundation and airbag technology, which is applied in soil protection, infrastructure engineering, construction, etc., to achieve the effects of low energy consumption, low comprehensive cost, and small consumption
Inactive Publication Date: 2009-11-18
TIANJIN UNIV
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Problems solved by technology
[0003] The various mature and common soft foundation reinforcement methods mentioned above have their own advantages and disadvantages and their applicability
Method used
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[0021] When using this kind of airbag to reinforce the soft soil foundation, the implementation method is as follows:
[0022] (1) Exhaust the gas in the two airbag cavities to make the airbag shrink, and then insert the airbag vertically into the soft soil foundation soil layer that needs to be reinforced by using the insertion rod.
[0023] (2) Inflate the two airbag cavities from bottom to top. The air pressure in the lower airbag cavity is controlled at 300kPa, and the air pressure in the upper airbag cavity is controlled at 200kPa. Regularly observe the air pressure in the airbag cavity every day. Infuse air in the airbag cavity to maintain the above-mentioned air pressure in the airbag cavity; this lasts for 10 to 20 days, and the pore water in the soil layer with a radius of 3.0m around the airbag can be partially discharged to achieve compactness; after that, the gas in the airbag cavity is released, and the airbag shrink.
[0024] (3) During the contraction process o...
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The invention discloses a method for strengthening soft soil foundation by air extrusion and drainage and an air bag used. The method comprises: draining the gas in the inflatable body cavity, putting the inflatable body into the soft soil foundation to be reinforced; Inflate the body cavity, regularly observe the change of air pressure and replenish air; keep the inflatable body squeezing the soil layer for a period of time, and release the gas in the inflatable body cavity after the soil layer reaches the compactness requirement; take out the inflatable body from the soil layer, and fill the hole with soil material. The airbag device is used to realize the method, which includes an elastic multi-chamber airbag body and an insertion rod, and the airbag body is fixed on the insertion rod; the inner layer of the airbag is made of rubber material, and the outer layer is a hydrophobic fabric, and the two layers of materials are bonded with glue . The air bag in the present invention can be reused, the energy consumption of pressing and drainage is small, the consumption of sand and gravel is small, and the comprehensive cost is low. The consolidation pressure applied by the method of the invention is large, the reinforcement time for the soft soil layer is short, the reinforcement effect is good, and the method is suitable for the reinforcement of soft soil foundations in various sites and ranges.
Description
technical field [0001] The invention relates to a method for strengthening soft ground by air extrusion drainage and an air bag used. The invention belongs to a method and a device for strengthening soft ground in the field of geotechnical engineering. Background technique [0002] At present, there are many methods for strengthening the soft soil foundation, such as sand and gravel replacement method, cement mixing reinforcement method, surcharge preloading method, vacuum preloading method, etc. Sand and gravel replacement method is a method of replacing all or part of the soft soil layer with sand and gravel to improve the bearing capacity of the foundation. This method is effective, but the cost is high, and it is not suitable for large-scale soft foundation reinforcement in areas where sand and gravel are scarce. The cement mixing reinforcement method is to mix cement slurry or dry cement powder evenly with soft soil to form cement soil. The cement reacts with water and...
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IPC IPC(8): E02D3/02
Inventor 别社安
Owner TIANJIN UNIV