Multifunctional unsaturated soil permeameter and testing method thereof

Abstract

The invention discloses a multifunctional unsaturated soil permeameter and a testing method thereof. The permeameter comprises a first bracket, a second bracket, a water supplementing device which is fixed on the first bracket and can perform up-and-down adjustment, and a soil sample permeation device which is fixed on the second bracket and can perform up-and-down adjustment, wherein the water supplementing device and the soil sample permeation device can be combined to form an underground water level rise simulation device, a flooding simulation device or a rainfall simulation device. The testing method comprises the following steps of: 1, performing underground water level rise, flooding and rainfall simulation tests, namely respectively performing the underground water level rise, flooding and rainfall simulation tests on the same tested soil sample by employing the underground water level rise simulation device, the flooding simulation device and the rainfall simulation device; 2, performing test data arrangement, and acquiring a permeation characteristic testing result of the tested soil sample. The multifunctional unsaturated soil permeameter is reasonable in design, low in investment cost, simple in operation, convenient in realization and good in using effect and can simply and rapidly finish the permeation characteristic testing process of unsaturated soil.

Description

technical field [0001] The invention belongs to the technical field of testing permeability characteristics of unsaturated soil, and in particular relates to a multifunctional permeameter for unsaturated soil and a testing method thereof. Background technique [0002] It is generally believed that soil is composed of three phases: solid phase (soil particles), liquid phase (soil water) and gas phase (gas contained in soil). When the voids of soil particles are completely filled by the liquid phase, that is, when the proportion of water to the soil voids is 100%. Soil is called saturated soil. On the contrary, the soil pores are filled with water and air, that is, when the saturation is less than 100 but greater than 0, the soil is unsaturated soil, and loess is unsaturated soil. The revelation of the interaction mechanism between water and loess is the core point to solve the problem of loess landslide disaster reduction under the action of water. The complexity and variabi...

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Problems solved by technology

[0005] Nowadays, in the study of slope stability mechanism, many scholars focus more on the study of water infiltration mode and infiltration mechanism. However, due to the incomplete seepage theory of unsaturated soil, the slope instability mechanism induced by water action is more complicated. It is complex. Under different conditions, the underlying surface, rainfall duration, rainfall intensity, and mode of action will all cause differences in slope deformation and failure characteristics. Therefore, the slope instability system under water action is huge and complex. However, the current experimental research on the seepage characteristics of unsaturated undisturbed The number of instruments is almost zero, and the research on the characteristics and mechanism of water infiltration is limited to computer simulation or the study of a single index (such as the permeability coefficient). A set of unsaturated soil multifunctional permeameter with reasonable design, simple operation, convenient implementation and good use effect and corresponding test methods can fill the gap in the study of undisturbed soil seepage law, and at the same time, it can provide more water infiltration modes and methods in the future. Action characteristics lay the groundwork

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