Frost-heaving ratio and thaw-settlement coefficient simultaneous determination tester for soil body

Abstract

The invention discloses a frost-heaving ratio and thaw-settlement coefficient simultaneous determination tester for a soil body. The tester comprises a soil body filling barrel with two run-through ends, wherein a water tank is arranged at the bottom of the soil body filling barrel; the water tank is connected with a water source supplementing device for keeping a water level in the water tank constant; the upper part of the soil body filling barrel is connected with a low-temperature stabilizing system for enabling the soil body to be in a low constant temperature state and a plurality of displacement sensors for detecting displacement of the soil body; a plurality of temperature and humidity sensors for detecting the moisture content and the temperature of the soil body are arranged on the soil body filling barrel in an inserting manner; the displacement sensors and the temperature sensors are respectively connected to a main control computer through a displacement data acquirer and a moisture and temperature recorder. On the premise of guaranteeing a stable water level, the tester can simultaneously measure a frost-heaving ratio and a thaw-settlement coefficient of the soil body under two conditions with water source supplementation and without water source supplementation, and can further measure changes of a temperature field and a moisture field of the soil body in a frost-thaw process, so that a moisture migration rule that the moisture field is changed with the temperature field in a gradient manner can be explained.

Description

technical field [0001] The invention belongs to the field of soil property testing, and in particular relates to a tester for joint determination of soil frost heaving rate and thawing coefficient. Background technique [0002] The muddying of roads is a unique phenomenon in seasonally frozen soil regions. It is also one of the most common diseases in highway engineering, with high frequency, wide range and serious impact. Frost heave is the main cause of mud turning. The frost heave property of soil is mainly characterized by the frost heave rate. [0003] However, there are currently the following defects in the testing of soil freeze-thaw properties: 1. The domestic frost heaving rate and thawing coefficient tests are carried out separately, which is time-consuming and laborious; 2. Conventional methods are suitable for clayey soils with small particle sizes. of sandy soil. For clayey soil and sandy soil with small particle size, the sample box can use a plexiglass cy...

AI Technical Summary

Problems solved by technology

[0003] However, there are currently the following defects in the testing of soil freeze-thaw properties: 1. The domestic frost heaving rate and thawing coefficient tests are carried out separately, which is time-consuming and laborious; 2. Conventional methods are suitable for clayey soils with small particle sizes. sandy soil

For clayey soil and sandy soil with small particle size, the sample box can use a plexiglass cylinder with an outer diameter of 120 mm, a wall thickness of 10 mm, and a height of 100 mm as the side wall, but for soil with a large particle size, the instrument is biased. 3. The conventional frost heaving rate test does not measure the moisture change in the vertical direction of the soil sample, but only measures the temperature change of the soil sample at different heights, which cannot explain the freezing process of the soil. The redistribution of moisture field caused by the change of temperature field

Images