Test device for simulating dry-wet cycle and freeze-thaw cycle of roadbed soil body

Abstract

The invention discloses a test device for simulating a dry-wet cycle and a freeze-thaw cycle of a roadbed soil body. The test device comprises a test cylinder main body, a temperature and humidity sensor is hermetically arranged in the test cylinder main body along each detection channel in a penetrating manner, and the temperature and humidity sensor is electrically connected with the input end of a data acquisition instrument, a channel filtering piece is fixed in the outer discharging channel, and a hydraulic jack is fixed to the bottom face of a beam of the portal frame. The device has theadvantages that the hydraulic jack compacts a soil sample in the test cylinder main body, when the dry-wet cycle test is carried out, the low-temperature constant-temperature tank dries the soil sample, the low-temperature constant-temperature tank is removed, water is injected into the temperature control layer, and the dry-wet cycle test is repeatedly carried out to complete the dry-wet cycle test, when a freezing and thawing cycle test is carried out, the low-temperature constant-temperature tank repeatedly circulates the soil sample to carry out cooling freezing and heating thawing, in the dry-wet cycle and freeze-thaw cycle test process, the data monitored by the temperature and humidity sensor is fed back to the data acquisition instrument in real time, and the device is simple to operate, time-saving, labor-saving and low in investment cost.

Description

Technical field: [0001] The invention relates to the technical field of equipment for simulating dry-wet and freeze-thaw phenomena of roadbeds, in particular to a test device for simulating dry-wet cycles and freeze-thaw cycles of roadbed soil. Background technique: [0002] During the use of the road subgrade, it is not only subjected to the repeated action of vehicle loads, but also the comprehensive action of external environmental factors. There are seasonal repeated changes in its internal moisture content. Studies have shown that under the action of dry-wet cycles, the subgrade soil is repeatedly frozen. Under the action of melting and melting, the phenomenon of water migration in the roadbed is obvious. The water migration will change the unsaturated state of the roadbed soil, reduce the strength of the soil, and reduce the stability of the roadbed, which seriously affects the performance and service life of the road. [0003] In order to study the change law of the p...

AI Technical Summary

Problems solved by technology

[0002] During the use of the road subgrade, it is not only subjected to the repeated action of vehicle loads, but also the comprehensive action of external environmental factors. There are seasonal repeated changes in its internal moisture content. Studies have shown that under the action of dry-wet cycles, the subgrade soil is repeatedly frozen. Under the action of melting and melting, the phenomenon of water migration in the roadbed is obvious, and the water migration will change the unsaturated state of the roadbed soil, reduce the strength of the soil, and reduce the stability of the roadbed, seriously affecting the performance and service life of the road

[0003] In order to study the change law of the physical and mechanical properties of the subgrade soil after the dry-wet cycle of the subgrade soil and the freeze-thaw cycle of the subgrade soil, it is usually necessary to carry out the dry-wet cycle test and the freeze-thaw cycle test of the simulated subgrade soil. In order to provide a theoretical basis for the construction of subgrade engineering; at present, the research on the dry-wet cycle and freeze-thaw cycle of subgrade soil mainly focuses on indoor full-scale experiments, that is, to use subgrade soil samples to build large-scale experimental subgrades indoors, and then simulate Conduct dry-wet cycle test and freeze-thaw cycle test to collect relevant data; however, the whole process of completing the indoor full-scale test is cumbersome and requires a lot of work, time-consuming and labor-intensive, and requires high investment costs

Images