Indoor test device for measuring seepage erosion characteristics of multiple layers of soil samples under in-situ pressure

Abstract

The invention discloses an indoor test device for measuring the seepage erosion characteristics of multiple layers of soil samples under in-situ pressure. The indoor test device comprises an experimental box body, a servo hydraulic loading system, a constant water-head water pressure system, a vertical displacement sensor, a water flow sensor, a fine particle migration quantity metering system, and a computer integrated control system; the experimental box body is used for containing the soil samples; the servo hydraulic loading system is used for providing normal load for simulating the in-situ pressure of the soil samples; the fine particle migration quantity metering system is used for calculating the mass of fine particles which are flushed out from the soil samples by water flow underan seepage erosion effect; and the computer integrated control system is used for controlling the operation of the experimental instrument and collecting, calculating and storing experimental parameters monitored by the sensors. With the device adopted, the conditions of in-situ pressure and constant head water flow seepage erosion can be provided for the plurality of layers of soil samples indoors; the change quantity of the permeability coefficients of the soil samples, the sedimentation quantity of the soil samples and the migration quantity of fine particles in each layer of soil sample can be determined in time; and the seepage erosion characteristics of each layer of soil sample can be analyzed.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to an indoor test device for measuring seepage and erosion characteristics of multilayer soil samples under in-situ pressure. Background technique [0002] With the further development of urbanization, urban land subsidence has attracted more and more attention. Such problems have occurred in many countries and regions around the world, such as Germany, Hong Kong, Spain, Indonesia, etc. The annual economic losses caused by land subsidence serious. In China, there are 7.9×104km areas where the cumulative subsidence exceeds 200mm 2 , and there is still an expanding trend. An important factor leading to land subsidence is the migration and flow of fine particles in the soil pores during the seepage process of the formation, that is, the seepage erosion phenomenon that occurs in the formation. [0003] The seepage of water in soil has a great influence on...

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Problems solved by technology

At present, some studies have used field tests and indoor model tests to simulate the effect of seepage force on seepage and erosion, but the existing devices have not considered the influence of in-situ pressure on soil seepage and erosion, especially for revealing the details of the seepage process. The research on the experimental device and measurement method of particle migration erosion mechanism is still lacking

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