Large water-level-controllable device and method for determining soil infiltration coefficient

Abstract

The invention relates to a large water-level-controllable device and method for determining a soil infiltration coefficient. Based on the feature that coarse-grained soil and over coarse-grained soilare large in dimension, the dimension of a common 70 type infiltrating instrument can not meet the demands of an infiltrating test for the dimension of the instrument, and therefore experimental equipment suitable for specific infiltrating tests needs to be researched. Based on the feature that a coarse-grained / over coarse-grained soil structure is high in infiltrating performance, the constant head infiltrating test equipment is designed and composed of a water supply system, a pressure gauge, water overflowing openings, a water drainage hole, a comprehensive measurement device, a buffering layer and a boundary latex diaphragm. In the equipment, water head change can be realized through on-off of valves at the water overflowing openings and an adjusting clamp at the water outlet during testing, and research can be conducted on the rule of earth-rock aggregate permeability under the effect of different water heads. The boundary latex diaphragm makes tight contact with a soil sample, sothat the amount of water permeating downwards from a boundary, and the influences of the boundary effect on permeation tests are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to a large water level controllable soil permeability coefficient measuring device and a measuring method. Background technique [0002] In mountainous cities, the topography is relatively complex. During the development of urban infrastructure, it is inevitable that some terrain will be backfilled. However, soil-rock mixtures have become more and more commonly used filling materials due to their low cost and convenient materials. Therefore, the construction of rail transit tunnels in the later stage will inevitably pass through the earth-rock mixture backfill area. Soil-rock mixture not only exists in nature as a common geological body, but also is widely used in various engineering constructions as a geotechnical engineering material because of its unique physical and mechanical properties. Soil-rock mixture is the mixture of soil, gravel, and block stone in the fi...

AI Technical Summary

Problems solved by technology

Researchers have obtained the physical and mechanical properties of soil-rock mixture through a large number of indoor shear tests, but there are relatively few studies on the seepage and permeability characteristics of soil-rock mixture

At present, the research on soil-rock mixtures mostly uses self-made large-scale indoor constant head permeameters for research, but looking at the test instruments of various researchers, they have not been able to well control the "boundary effect" of the instruments, which makes the accuracy of the test results Difficult to guarantee

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