Multi-parameter dynamic acquisition artificial ground freezing experimental device and method

Abstract

The invention provides a multi-parameter dynamic acquisition artificial ground freezing experimental device and method. The experimental device comprises a soil sample container, a data acquisition system, a hydraulic system and a freezing system. The soil sample container comprises an upper cover, a cylinder and a base plate. The data acquisition system comprises a data acquisition panel, a wateracquisition apparatus and a salt acquisition apparatus. The freezing system comprises a freezing machine, a liquid supply pipe, a liquid return pipe and a freezer. The freezing machine is used for generating and pumping low temperature or high temperature medium, which undergoes heat exchange with the soil sample in the freezer. The experimental device can achieve freezing or forced thawing of the artificial ground soil sample, and can dynamically acquire the soil sample moisture, salinity, temperature, displacement and other parameters in the freezing process. The experimental device can simulate the test environment of offshore saline ground freezing and be used for studying the freezing law of saline frozen soil, and provides a reference for offshore saline ground freezing scheme design and construction.

Description

technical field [0001] The invention relates to the field of artificial strata freezing methods, in particular to an experimental device and an experimental method for multi-parameter dynamic acquisition of artificial stratum freezing. Background technique [0002] Artificial ground freezing method is the main construction method of underground engineering construction in water-rich soft soil layer, and this construction method has been widely used in shaft excavation and tunnel construction in our country. In recent years, during the construction of subway tunnels in the eastern coastal areas of my country, a large number of offshore saline strata have been encountered. This stratum has the characteristics of high salt content and active groundwater. The soil mass in this place is accompanied by water migration and salt migration during the freezing process. Complex physical change processes such as , frost heaving, and salt heaving lead to large differences between the phys...

AI Technical Summary

Problems solved by technology

In recent years, during the construction of subway tunnels in the eastern coastal areas of my country, a large number of offshore saline strata have been encountered. This stratum has the characteristics of high salt content and active groundwater. The soil mass in this place is accompanied by water migration and salt migration during the freezing process. Complex physical change processes such as frost heaving, salt heaving, etc. lead to a large difference between the physical and mechanical parameters of frozen soil and conventional frozen soil. However, there is currently a lack of systematic experimental research on offshore saline frozen soil.

[0003] The frozen soil test block test can accurately reflect the various characteristics of the test block, but there is a big difference with the freezing law of the soil in the actual project, and the data provided by the test block test cannot intuitively provide guidance for the actual project; The similarity model test is an important test method for engineering feasibility analysis. The accuracy of the test results is mainly limited by the similarity ratio between the test model and the actual project. The larger the similarity ratio, the higher the reduction degree of the model to the project. The greater the reference value of the project

Images