Extrusion and vibration consolidation method for soft soil foundation

Abstract

The invention provides an extrusion and vibration consolidation method for a soft soil foundation. The method is characterized by comprising the following steps that 1, holes are drilled at intervalson a soft soil foundation region, an air bag device is arranged in each hole, and each air bag device comprises an air bag and an inflation valve, wherein the air bag has elasticity and certain air permeability, the longitudinal length of the air bag corresponds to the depth of the corresponding hole, and the inflation valve can adjust the inflating volume of the air bag; 2, all the air bag devices are inflated so that the air bags are expanded, when the internal pressure of the air bags reaches certain air pressure P1, the inflation valves are closed, inflation is stopped, and then air slowlyleaks from the air bags; 3, when the internal pressure of the air bags is smaller than certain air pressure P2, the inflation valves are opened, and the air bags are inflated again and are expanded again, wherein P2<P1; 4, the step 2 and the step 3 are repeatedly carried out, and the soft soil foundation is continuously extruded and vibrated; and 5, after the consolidation degree of a soil body meets the requirement, the air in the air bags are discharged, the air bag devices are moved out of the holes, the holes are filled with foundation fillers to form the foundation meeting the design requirements so as to complete the consolidation of the soft soil foundation.

Description

technical field [0001] The invention belongs to the technical field of soft soil foundation treatment in geotechnical engineering, and in particular relates to a soft soil foundation extrusion vibration consolidation method. technical background [0002] At present, the commonly used soft soil foundation treatment methods include mechanical compaction method, displacement method, preload consolidation method, vacuum preload method, etc. New foundation treatment methods include multiple pressurization method, air extrusion drainage consolidation method, etc. [0003] The mechanical compaction method is to use machinery to apply instantaneous and repeated loads in the soil, so that the relative movement between soil particles occurs, the void volume is reduced, and the bearing capacity is improved. This method is simple in construction, but the noise is large, and it is only suitable for soft soil foundations. The surface layer has a better treatment effect. [0004] The repl...

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Problems solved by technology

[0007] The multiple pressurization method is a method that combines vacuum drainage, vibrating head vibration pressurization and dynamic compaction pressurization to accelerate foundation drainage consolidation. This method has a short construction period and good effect, but the construction is complicated and cumbersome, and the construction noise is large

[0008] The air squeeze drainage consolidation method is to put the inflatable body into the soil layer and inflate it, and use the air pressure in the inflatable body to apply a load to the soil layer, thereby accelerating the drainage and consolidation of the soil. This method applies pressure to the soil from the soil layer The lateral extrusion load overcomes the disadvantages of the traditional surcharge method, such as the small effective force in the deep soil and the small pressure exerted by the vacuum preloading method.

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