Freeze-thawing circulation detection apparatus for nature saline soil

Abstract

The present invention provides a freeze-thawing circulation detection apparatus for nature saline soil, wherein the apparatus is used for detecting the formation process of saline soil under nature environment conditions and detecting the frost heaving and melt sinking change law of the saline soil during multiple freeze-thawing circulation processes. According to the present invention, the upper portion of a sample tube of the apparatus is connected with a low temperature constant temperature box for detecting the temperature change under a nature state, temperature setting is decided according to the air temperature of a region, the bottom of the sample tube is fixed with a temperature control head, the detected temperature between the soil under the nature conditions is set as +5 DEG C, and the temperature control head on the bottom is connected with a water replenishment device for detecting groundwater and salinity replenishment under the nature conditions; and with the freeze-thawing circulation detection apparatus for nature saline soil, the freeze-thawing circulation mechanism of the saline soil can be well reflected so as to provide reference for engineering construction in the saline oil area.

Description

technical field [0001] The invention relates to the technical field of civil engineering instruments, which simulates the freezing-thawing phenomenon of natural saline soil in a natural environment and conducts fully automatic digital detection, and studies the changing law of natural saline soil in multiple freezing-thawing cycles, providing engineering It provides a basis for the control and treatment of saline soil in construction. Background technique [0002] With the implementation of the country's western development strategy, it is inevitable to increase investment in infrastructure in the western region. Many infrastructures have encountered saline soil layers and roadbeds during construction, such as the Qinghai-Tibet Railway, the Lanzhou-Xinjiang Railway, and the Hami-Lop Nur Railway, etc.; therefore, in-depth research on the formation mechanism and changing laws of saline soil has become the current focus of research on saline soil. an overriding question. [0...

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Problems solved by technology

Although the device simulates the conditions of temperature change and water supply in the natural environment, there are still many problems as follows: (1) The water replenisher cannot constantly provide water to the sample and accurately adjust the water level, which is difficult to be realistic. (2) When the sample is subjected to external heat preservation, the insulation layer cannot be strictly insulated, and even after the heat preservation measures are implemented, it is not conducive to observing the changes of saline soil outside; (3) Measurement During the frost heaving of saline soil, the weight of the cooling head on the upper part of the device substantially restrains part of the frost heaving amount of saline soil, and at the same time causes damage to the internal structure of saline soil. The frost heaving amount of saline soil cannot be accurately simulated; (4) When analyzing the influencing factors such as temperature, moisture and salinity, the device only monitors the temperature, and the salinity and moisture are only monitored after each freeze-thaw cycle. , measured after sampling

On the one hand, the operation is cumbersome. On the other hand, when sampling, the accidental error in selecting the sampling position is very large, and it is difficult to monitor the influencing factors at the same time; (5) The device can only measure the frost heave of saline soil, and the dissolution is also One of the important engineering properties of saline soil, but this device cannot solve

In a word, although the device has simulated the natural environment changes and the influence of water on saline soil, the simulation of the natural environment of saline soil is far from enough, and there is a certain gap between the research results and the actual engineering. Applied in engineering construction tends to be dangerous

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