Vacuum prepressing improved technical method
A technology, vacuum technology, applied in the field of vacuum preloading improvement, can solve the problem of low strength of dredger fill
Inactive Publication Date: 2009-10-21
TIANJIN URBAN CONSTR COLLEGE
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Problems solved by technology
Due to the extremely low strength of the dredger fill, the traditional vacuum preloading technology is difficult to directly meet the needs of engineering construction
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Embodiment Construction
[0035] Through in-depth research on the reinforcement mechanism and construction technology of the vacuum preloading method, the present invention proposes to use sponge or geotextile instead of sand as the horizontal drainage material, and fill the horizontal drainage pipe with gravel to prevent it from being crushed due to negative pressure during vacuuming . Since the sponge or geotextile can be reused many times, the engineering cost of the vacuum preloading method is reduced.
[0036] 1 technical solution
[0037] 1.1 Test equipment
[0038] The test device consists of vacuum source (jet pump), connection device (6cm bellows, filter tube, flange), measurement system (vacuum gauge, pore pressure gauge, surface settlement mark) and other parts.
[0039] 1.2 Technical methods
[0040] The outdoor model test is used to simulate the site, and the method is as follows: dig two test pits in the in-situ test site, one is used as a reservoir and a vacuum source is installed, an...
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The invention relates to a vacuum prepressing improved technical method, which comprises the following steps: covering a geotextile on the soft soil ground needing to be drained, vertically inserting a plurality of drain plates into the soft soil ground, exposing the upper ends of the drain plates on the geotextile of the ground surface, distributing a filter pipe on the geotextile, and connecting the filter pipe with a corrugated pipe; covering a surface geotextile on the filter pipe and the corrugated pipe, and covering a sealing film on the topside; and connecting the corrugated pipe with a vacuum water suction pump. The vacuum prepressing improved technical method adopts a plurality of transform distribution methods. The method has the advantages that the vacuum preloading generates hyperstatic pore water pressure in the soil body of a reinforced zone, and the foundation soil generates consolidation along with gradual dissipation of the hyperstatic pore water pressure. The horizontal drainage and vertical drainage are indispensable in the vacuum preloading technology, but the vertical drainage plays larger role in the foundation treatment effect. The preloading magnitude has different actions on the consolidation degree of the covered foundation soil, and the test shows that the preloading magnitude is in direct proportion with the consolidation degree. The vacuum prepressing has quite obvious effect on new dredger fill.
Description
technical field [0001] The invention belongs to soft soil foundation treatment technology, in particular to a vacuum preloading improvement technology method. Background technique [0002] According to the development planning requirements of Tianjin Binhai New Area, Binhai New Area will be built into a highly open modern economic new area facing the 21st century, and will become the largest economic growth point of Tianjin and the region. Accelerating the development of the Binhai New Area has become an important part of the strategic layout of the development of the Bohai Rim region and even the national development. [0003] Tianjin Binhai New Area is currently developing large-scale (planned about 300Km 2 ) dredging reclamation land reclamation project, how to accelerate the use of dredging reclamation site engineering is an urgent problem to be solved at present. As a special soil, dredger fill soil has a small distribution range. It has dredger fill in some coastal c...
Claims
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IPC IPC(8): E02D3/10
Inventor 杜东菊杨爱武赵瑞斌刘寒鹏刘举卢力强
Owner TIANJIN URBAN CONSTR COLLEGE