Expansive-soil permeameter with different overlying loads and variable water pressure of high-speed rail and use method thereof

Abstract

The invention discloses an expansive-soil permeameter with different overlying loads and variable water pressure of a high-speed rail and a use method of the expansive-soil permeameter with differentoverlying loads and the variable water pressure of the high-speed rail. The expansive-soil permeameter comprises a laterally confined constrained uniform permeation module, a vertical loading module,a variable water-pressure water adding module and a supporting module; the laterally confined constrained uniform permeation module comprises a base, a permeation cylinder, a permeable stone layer, and a cover plate; the vertical loading module comprises a force applicator, a stress meter, and a force transmitting spring; the variable water-pressure water adding module comprises a water supply container, a variable pressure head pipe, a pipe clamp, a capacity adjustment clamp, a water inlet pipe clamp, and a connecting hose; the support module comprises an upright column, an upper beam, a lower beam, a support platform, and a support clamp. The expansive-soil permeameter disclosed by the invention has the beneficial effects of solving the permeability coefficient determination test of theoriginal expansive soil under different overlying loads and the variable water pressure, and being suitable for study on permeability of any cohesive soil, fast in assembly and reliable and stable.

Description

technical field [0001] The invention belongs to a device for measuring the permeability coefficient of expansive soil roadbed, in particular to measuring the permeability coefficient of expansive soil under different overlying loads and variable water pressure. Background technique [0002] Expansive soil is an unsaturated soil that absorbs water, expands, shrinks when it loses water, and contains more expansive clay minerals. In the construction and operation of expansive soil areas, the disease of subgrade arching deformation is ubiquitous and is a technical problem that needs to be solved urgently. Rainfall infiltration and excavation of road cuttings cause the groundwater table to rise and enter the expansive soil, which are the main reasons for the expansion of the subgrade. Expansive soils are widely distributed in more than 40 countries on six continents in the world. Expansive soils are widely distributed in my country, and expansive soils have been found in more t...

AI Technical Summary

Problems solved by technology

[0006] Prior Art 1 has the following disadvantages: it is mainly used for the permeability measurement of sandy soil and non-cohesive soil containing a small amount of gravel under constant water head, and is not suitable for cohesive soil, such as expansive soil

[0008] The second existing technology has the following disadvantages: although the permeability of the soil under the applied load can be measured, the test operation is complicated and time-consuming, requires skilled personnel to operate, and the cost is high

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