Method for constructing soil freezing temperature prediction model
A freezing temperature and prediction model technology, applied in the fields of geotechnical engineering and frozen soil engineering, can solve the problems of freezing temperature error, inconvenient freezing temperature value, and low efficiency.
Pending Publication Date: 2022-08-05
SHENYANG ZHONGJIAN DONGSHE GEOTECHN ENG +1
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Problems solved by technology
[0003] For a specific soil, its freezing temperature is affected by dry density and water content; Influenced by many factors such as category and content, if the freezing temperature of pure water is used as the freezing temperature of soil, it will cause a large error
The method of continuous testing is used to determine the freezing temperature. On the one hand, it needs to be equipped with precise sensors and data acquisition equipment. On the other hand, the test is time-consuming, laborious, inefficient and expensive, and it is not convenient to quickly obtain the freezing temperature value.
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[0039] When there is no knowledge of the freezing temperature of a soil, a few data points can be obtained through a small amount of cooling and freezing monitoring, and then the freezing temperature of other physical states can be predicted based on this known freezing temperature state. The test objects used include a small-volume high-precision temperature sensor (usually a small-volume thermistor, with an accuracy of 0.01°C and above, and a mercury thermometer of level 2 or above is required for calibration), a collector that can automatically record according to a certain frequency (which can be realized). Known equipment that automatically records according to a certain frequency can be), tested items and computers, etc. The specific process is as follows:
[0040] 1. Prepare 3 groups of soil samples with different quality water content, denoted as ω1, ω2, ω3, and prepare test soil samples according to the target dry density. The three groups of test dry densities are ρ1...
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The invention discloses a method for constructing a soil body freezing temperature prediction model, belongs to the technical field of geotechnical engineering, and provides the soil body freezing temperature prediction model which comprehensively considers the influence of two factors of water content and dry density. The two factors are engineering conventional macroscopic parameters and are convenient to obtain. The prediction model does not need to analyze factors such as particle size content and mineral composition of the soil body, can perform prediction only through two conventional physical parameters, and has the advantages of high efficiency and convenience. Freezing temperatures of different physical states of a soil body can be obtained based on monitoring of a freezing process temperature time history chart of a measured soil sample.
Description
technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to the field of frozen soil engineering, and particularly relates to a method for constructing a soil freezing temperature prediction model for predicting the freezing temperature of soil. Background technique [0002] The freezing temperature of the soil is a key index to determine whether the soil is in a frozen state, and it is also the basis for determining the freezing depth and the thickness of the artificial frozen wall. In addition, the freezing temperature is also an important parameter in the soil freezing characteristic model (unfrozen water content, matrix suction), frozen soil mechanical properties and frozen soil permeability characteristics. In cold area engineering construction, artificial freezing technology and freezing test process, it is necessary to judge the freezing process of the site (or sample). The real-time monitoring of temperature senso...
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IPC IPC(8): G01N25/12G01N25/14G06F30/20
CPCG01N25/12G01N25/14G06F30/20Y02A90/10
Inventor 辛全明佘小康赵忠亮孙明涛梁海秦培峰曹洋李慧吴艳彬马晓川
Owner SHENYANG ZHONGJIAN DONGSHE GEOTECHN ENG