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Method for increasing thin-sand-layer-filling soft clay foundation vacuum degree

A technology of vacuum degree and soft clay, applied in soil protection, infrastructure engineering, construction, etc., can solve problems affecting the effect of vacuum preloading reinforcement, affecting the effect of vacuum preloading, large pressure loss, etc., to reduce losses, Easy to make, the effect of improving the vacuum degree

Inactive Publication Date: 2008-03-26
SHANGHAI XINGYU CONSTR ENG
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Problems solved by technology

A slight air leakage will reduce the vacuum degree and affect the effect of vacuum preloading
However, when there is a penetrating thin sand layer in the clay foundation, since the permeability coefficient of the sand layer is much larger than that of the clay soil, the vacuum pressure applied through the plastic row plate will cause a large pressure loss due to the air leakage of the sand layer, even Does not work at all locally, affecting the reinforcement effect of vacuum preloading

Method used

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  • Method for increasing thin-sand-layer-filling soft clay foundation vacuum degree
  • Method for increasing thin-sand-layer-filling soft clay foundation vacuum degree

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Embodiment Construction

[0022] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0023] For a foundation that requires vacuum preloading, it is confirmed that the total thickness of the soft clay layer is 23m, and there is a sand layer below it through the on-site pore pressure static sounding (as shown in Figure 1). Among them, the lower part is the initial accumulation of soft clay layer with a thickness of 8m and the elevation of the top surface of the soil layer is -12.0m; A thin sand layer with a thickness of about 2m. The initial water level is on the surface, that is, the groundwater level is +3.0m. The consolidation coefficient of each s...

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Abstract

The present invention relates to building engineering technology, and is especially method of raising the vacuum degree in soft clay foundation with sandwiched sand layer. Probes with pore pressure gauge are mounted to the ends of inserted plate steel pipes to test the pore pressures and determine the clay distribution and property, and sealing plastic sheet is set to the earth work water draining plastic plate in the required height to block air permeating channel. The method can prevent water from leaking to the water draining plastic plate and maintain the vacuum degree in the sand layer. The method is simple, convenient and low in cost.

Description

technical field [0001] The invention relates to a method in the technical field of construction engineering, in particular to a method for increasing the vacuum degree of a soft clay foundation with a thin sand layer. Background technique [0002] Since the Swedish scientist Kjellman proposed the method of using atmospheric pressure (vacuum preloading) to drain and consolidate soft soil foundations in 1952, engineers from many countries in the world have developed various methods for the soft soil foundation conditions of their respective countries. Various technical solutions have formed vacuum preloading technologies with their own characteristics. After entering the 1980s, my country improved the construction technology of vacuum preloading treatment of soft soil foundation. Since then, vacuum preloading technology has developed rapidly in China; from a single vacuum preloading method to vacuum combined surcharge, Vacuum joint precipitation, etc. It has been gradually ap...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/10
Inventor 沈水龙柴锦春洪振舜杜延军
Owner SHANGHAI XINGYU CONSTR ENG
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