Vacuum surcharge preload combined with electroosmosis test device

Abstract

The invention discloses a vacuum preloading combined electric osmosis test apparatus. The vacuum preloading combined electric osmosis test apparatus comprises a test barrel, a pressurizing system, anair-water separation system, an electrode loop and a data acquisition system; the test barrel comprises a barrel body and a barrel cover as well as a sand mat with the top surface covered with a sealing film; the pressurizing system comprises a pressurizing guide pipe, a pressure chamber, an air supply guide pipe and a pneumatic device which are successively connected with one another as well as afirst electronic scale; the air-water separation system comprises a water discharging guide pipe, an air-water separation apparatus, an air exhaust guide pipe and a vacuum pump which are successivelyconnected with one another as well as a second electronic scale and a vacuum gauge; the electrode loop comprises an anode, an ampere meter, a power supply and a cathode flexible water discharging assembly which are serially connected by virtue of a conducting wire, and the cathode flexible water discharging assembly is a two-layer nonwoven geotechnical cloth tubular bag with an inner layer of bagged graphite particles and an outer layer of bagged sand; and the data acquisition system comprises various sensors as well as a data acquirer and a computer. The vacuum preloading combined electric osmosis test apparatus can perform the indoor research test for different soil test samples under the combined or independent action of vacuum prepressing, preloading and electric osmosis water discharging.

Description

technical field [0001] The invention relates to a test device, in particular to a vacuum surcharge preloading combined electroosmosis test device, which belongs to the technical field of test equipment. Background technique [0002] In the southeast coast and some inland areas of my country, the deep and soft cohesive soil layers deposited in marine, lacustrine and river facies are widely distributed. Soft clay has many unfavorable engineering characteristics such as high water content, high compressibility, low permeability, low shear strength, weak bearing capacity, strong thixotropy and poor structure. High compressibility will lead to considerable settlement and settlement difference of the foundation; low permeability will prolong the duration of consolidation settlement and affect the normal use of buildings; low strength will make the bearing capacity and stability of the foundation often unable to meet engineering requirements. [0003] In recent years, with the rap...

AI Technical Summary

Problems solved by technology

However, when encountering soft clay foundations with small particle size and high clay content, vacuum surcharge combined with preloading cannot solve the problem of slow drainage and inconspicuous reinforcement effect.

[0005] Electroosmotic drainage consolidation is a promising foundation reinforcement method, because its drainage rate has nothing to do with the size of soil particles. Even in clay with poor permeability, it can still drain normally, but the electrode corrosion and energy consumption are too high. Restricts the engineering application of the electroosmosis drainage method

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