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A pulsating vacuum preloading drainage device and method for silty soil soft foundation
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A technology of pulsating vacuum and silty soil, applied in soil protection, infrastructure engineering, construction, etc., can solve problems such as low drainage efficiency, influence of foundation strength, and difficult engineering, and achieve improved drainage effect, easy installation and disassembly, Simple operation effect
Active Publication Date: 2017-07-11
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
Its main disadvantages are: 1) The water passage of the drainage plate in the soft foundation is easily blocked, which will seriously affect the drainage effect; 2) The drainage efficiency of this treatment method is low, and the drainage period is long, which affects the construction period
Its disadvantages are: 1) It is necessary to set a high-voltage electric pulse operation well in the soft ground treatment area, which is difficult and costly, and will affect the strength of the ground; 2) The soft ground treatment area is wide, the operation surface is large, and the power The pulse has a large loss in the soil, and the method is difficult to achieve the expected effect; 3) Output high-voltage DC pulse current in the soft foundation area with high moisture content, and the operation is highly dangerous; 4) This treatment method consumes a lot of energy and costs high
Its shortcoming is that the earth, as a large conductor, has a strong dilution effect on electric energy. It is difficult to form the expected current path when the electroosmosis method is applied to the soft foundation treatment, so it is difficult to achieve the expected treatment effect.
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Embodiment 1
[0035] For the sediment median particle size d 50 = 5 μm, mud with a water content of 86%, this embodiment provides a pulsating vacuum preloading drainage device for soft muddy soil foundation, in this embodiment, the vacuum pumping part adopts a vacuum pump, and the one-way valve adopts a straight-through type normally open To the valve 2, the valve control part 6 adopts a cycle timing power supply controller. Of course, in other embodiments, other components or devices may also be selected, as long as they can realize corresponding functions.
[0036] Specifically, the device is composed of a vacuum pump 1, a straight-through normally open one-way valve 2, a vacuum system main pipeline 3, a drainage plate 4, a sealing film 5, a valve control component 6 and a bypass branch 7, wherein: the vacuum pumping component, The one-way valve and valve control components are installed on the main pipe. The main pipe 3 is used to connect the vacuum pump 1 and the straight-through norma...
Embodiment 2
[0051] For the sediment particle size d 50 = 8 μm, mud with a moisture content of 75%, the present embodiment provides a pulsating vacuum preloading drainage device for soft muddy soil, which consists of a vacuum pump 1, a straight-through normally open one-way valve 2, a main pipe of the vacuum system 3, and a drainage system. The plate 4, the sealing film 5, the valve control part 6 and the bypass branch 7 are composed, and the connection method of each part is the same as that described in the first embodiment.
[0052] In this embodiment, the rated voltage of the vacuum pump 1 is 380V / 60HZ, and the pumping rate is 35m 3 / h, used to pump air to form a vacuum, with a pressure gauge on it, which can record the vacuum degree in the system in real time.
[0053] In this embodiment, the straight-through normally open one-way valve 2 has a diameter of 1.5 inches and a rated voltage of AC380v. Both ends are airtightly connected to the main pipeline 3, and are connected to a power...
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Abstract
The present invention provides a kind of pulsating vacuum preloading drainage device and method for muddy soil soft foundation. The components are connected to the one-way valve through a vacuum pipeline, and the one-way valve is connected to the valve control component; the valve control component controls the opening and closing frequency of the one-way valve, and the main pipeline is controlled by the periodic opening and closing of the one-way valve. The high-frequency turbulence is generated by the vacuum degree, which changes the continuous vacuuming effect of the vacuum parts on the main pipeline to intermittent vacuuming, so that the airflow in the main pipeline forms a high-frequency instantaneous pulse; the ports at both ends of the bypass branch are respectively It is arranged at both ends of the one-way valve, and when the one-way valve is closed, the water flow passes through the bypass branch, thereby ensuring the continuity of the drainage process. The invention is easy to install and disassemble, has low energy consumption and good effect, can be used repeatedly and has low cost.
Description
technical field [0001] The invention relates to a high-efficiency dehydration device and method for soft muddy soil foundations, in particular to a pulsating vacuum preloading drainage device and method for muddy soil soft foundations. Background technique [0002] Land reclamation is an important way to solve the shortage of land resources in our country. In the next ten years, my country will use dredging fill for tidal flat reclamation on a larger scale. Vacuum preloading method is the main construction method of soft foundation treatment engineering, but the permeability of muddy soil is extremely low, it is very difficult to transfer vacuum degree and drainage consolidation in muddy soil, and it takes a long time; for muddy soil foundation, The processing effect of the traditional vacuum preloading method is difficult to meet the requirements of the building for the bearing capacity of the foundation. In order to strengthen the foundation treatment effect of muddy soi...
Claims
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