Indoor test device for determining seepage erosion characteristics of soil sample under in-situ pressure

Abstract

The present invention discloses an indoor test device for determining seepage erosion characteristics of a soil sample under the in-situ pressure. The indoor test device comprises an experimental boxbody, a servo hydraulic loading system, a constant head water pressure system, a vertical displacement sensor, a water flow sensor, a fine particle migration and metering system, and a computer integrated control system. The experimental box body is configured to hold the soil sample; the servo hydraulic loading system is configured to provide a normal load to simulate the in-situ pressure of thesoil sample; the fine particle migration and metering system is configured to perform mass statistics on the fine particles of the soil sample washed out by the water flow under the action of the seepage erosion; and the computer integrated control system is configured to control the operation of the experimental instrument, and collect, calculate and store experimental parameters monitored by thesensor. According to the indoor test device provided by the present invention, the in-situ pressure and the conditions of the seepage erosion of the constant head water flow are provided for the soilsample, the change of the permeability coefficient of the soil sample, the settlement of the soil sample and the migration of the fine particles in the soil sample can be determined in time, and finally the seepage erosion characteristics of the soil sample can be analyzed.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and relates to an indoor test device for measuring seepage and erosion characteristics of 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., and the economic losses caused by land subsidence are serious every year. . 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 the engin...

AI Technical Summary

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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