Indoor model test method for vacuum-membrane-free vacuum pre-compression
An indoor model and test method technology, applied in the hydraulic model, foundation structure test, construction, etc., can solve the problem of low permeability of dredged silt soft soil, unharmonious environment, failure to comprehensively consider silt clay soft soil Project characteristics and other issues, to achieve the effect of saving money and harmonious environment
Inactive Publication Date: 2017-08-18
TIANJIN UNIV
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Problems solved by technology
[0008] 1. Unable to achieve energy saving, environmental protection, efficient and fast construction technology
During the construction process of vacuum preloading, the vacuum membrane often leaks air, blocking the air and replenishing the membrane, which requires a lot of manpower and material resources. In the production process, a large amount of plastic needs to be produced. After the construction, the vacuum membrane cannot be reused, which is not harmonious with the environment.
[0009] 2. Failure to comprehensively consider the soft soil engineering characteristics of dredged silt clay
Dredged fill silt soft soil has low permeability, so few experts use this engineering characteristic to study engineering problems
Method used
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[0023] The present invention will be described below in conjunction with the accompanying drawings and embodiments.
[0024] see figure 1 , a kind of vacuum preloading indoor model test method without vacuum film provided by the present invention, concrete test device connection comprises, adds test soil sample 10 in glass model box 2, inserts plastic drainage plate 1 in soil sample, plastic drainage plate and The one-way bow 3 connected with the steel wire hose 4 is connected; a layer of lower layer non-woven geotextile is laid on the top of the test soil sample, and a 500mm thick dredged muddy clay 6 is laid on the lower geotextile 5, and the surface of which is laid The geotextile 8; the steel wire hose 4 is connected with the steel wire hose branch pipe 7 through a tee, and the steel wire hose branch pipe 7 is connected with the steel wire hose main pipe 9, and the main pipe is placed on the top of the geotextile 8; the steel wire hose main pipe 9 and The vacuum pumps are...
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The invention relates to an indoor model test method for vacuum-membrane-free vacuum pre-compression. An adopted indoor model comprises a water drainage plate 1, a glass model box 2, a one-way butterfly knot 3, a steel wire hose 4, a steel wire hose supporting tube 7, a steel wire hose main tube 8 and a test soil sample 10, wherein the water drainage plate 1 is inserted into the test soil sample; the water drainage plate is connected to a main tube through the one-way butterfly knot, the hose and the supporting tube; and lower geotechnical cloth 5, mucky clay 6 and upper geotechnical cloth 8 spread on the upper surface of the test soil sample from bottom to top. The test method comprises the following steps of: putting a water-gas separating tank above an electronic scale; connecting the main tube and a vacuum pump to the water-gas separating tank with a vacuum meter; injecting water into the upper geotechnical cloth; opening the vacuum pump to load, observing reading of vacuum pressure of the water-gas separating tank, and detecting flatness of the surface of blow-filled mucky clay if vacuum pressure is lower than certain numerical value; closing the vacuum pump and unloading; and recording water displacement of the test soil sample according to the reading of the electronic scale.
Description
technical field [0001] The invention relates to a model in a vacuum preloading chamber without a vacuum membrane. Background technique [0002] In recent years, with the rapid development of my country's economy, the tension of land use in coastal areas has become increasingly prominent. Under such circumstances, cities have set off an upsurge of land reclamation. The foundation formed by land reclamation is mainly clay-based deep dredging fill. Most of the coastal cities in my country have a large amount of muddy soil, and land reclamation mostly uses dredging supersoft soil. The clay content of particle size less than 0.005mm is between 30% and 50%, and generally has the characteristics of high water content, large void ratio, low strength, high compressibility, low permeability and rheology, so this super soft Soil cannot meet the basic conditions required for engineering construction, and the consolidation of ultra-soft soil under its own weight will take several years or...
Claims
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IPC IPC(8): E02B1/02E02D33/00
CPCE02B1/02E02D33/00
Inventor 雷华阳冯双喜缪姜燕王磊
Owner TIANJIN UNIV