Measurement system for unsaturated infiltration coefficient of subgrade soil and related measurement method of system

Abstract

The invention relates to the field of road engineering, in particular to a measurement system for an unsaturated infiltration coefficient of subgrade soil and a related measurement method of the system. The measurement system for the unsaturated infiltration coefficient of the subgrade soil comprises a test sample containing device and a water supply device, the test sample containing device comprises a test sample containing part, a temperature measurement device and a medium suction measurement device are further arranged in a test sample containing cavity, the system further comprises a topcover which covers an opening in the test sample containing part, and the top cover is detachably connected with the test sample containing part; the test sample containing part further comprises anair guide channel, a water inlet channel and a drainage channel. The measurement system for the unsaturated infiltration coefficient of the subgrade soil and the related measurement method of the system have the advantages of integrated functions, convenient operation, precise control and the like, dynamic data can be collected in real time in the whole testing process, the measurement precision is greatly improved through internal checking, and the unsaturated infiltration coefficient under change of the moisture content of a soil sample is automatically measured.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a measurement system for the unsaturated permeability coefficient of roadbed soil and a related measurement method. Background technique [0002] In road engineering, groundwater seeps into the upper soil foundation due to the capillary action of the pores between soil particles. The rise of groundwater, precipitation infiltration and film water migration will lead to fluctuations in moisture content in the soil foundation and a decrease in the dry density of the soil, often resulting in Problems such as subgrade strength attenuation, deformation instability, freeze-thaw muddying, etc., endanger the safety, stability and long-term durability of transportation infrastructure. The permeability coefficient is an important index to characterize the strength and stability of the subgrade soil against water changes. The "Highway Soil Test Regulations" has proposed a corresponding test m...

AI Technical Summary

Problems solved by technology

At present, relevant scholars and scientific research institutions have developed corresponding measurement devices for the unsaturated permeability coefficient of subgrade soil, but the existing test methods and devices have the following key problems that need to be solved urgently: (1) It is difficult to accurately control the soil permeability during the sample preparation process. The initial state of the sample, such as moisture content, compaction, void ratio, etc.; (2) The size of the soil sample is small, which is greatly affected by soil variability and scale effect; (3) The structure is complex and the operation is cumbersome. The accuracy of the test results depends on the proficiency of the operator; (4) only the moisture content and permeability coefficient of the soil sample at a specific moment can be obtained, and the relationship between the permeability coefficient and the moisture content or saturation throughout the test cannot be obtained. law of change

Images