Method for determining liquid water contents at different temperatures in soil
A technology of liquid water content and water content, which can be used in soil material testing, calculation, design optimization/simulation, etc., and can solve problems such as experimental acquisition.
Active Publication Date: 2021-04-20
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
Most of the current studies on unfrozen water content in soil are based on soil moisture characteristic curves, and these parameters are difficult to obtain through experiments
Method used
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[0066] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.
[0067] Such as figure 1 As shown, a method for determining the liquid water content in soil at different temperatures includes the following steps:
[0068] S1. Determine the unfrozen moisture content n w Variation with test temperature:
[0069]
[0070] In the formula, w s is the initial volumetric water content in the soil, that is, the temperature is T 0 The volumetric water content in the soil at time, w r is the residual volume water content, T 0 is the initial freezing point of water, for pure water under normal pressure, its value is 0°C, and T is the test temperature; J het is the nucleation rate, that is, the formation rate of ice nuclei in supercooled pore water in soil;
[0071] Said step S1 comprises:
[0072] S101. ...
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The invention discloses a method for determining liquid water contents at different temperatures in soil. The method comprises the following steps: S1, determining a change rule of an unfrozen water content nw along with a test temperature; S2, for the soil sample, determining the unfrozen water content nw '2jeemaa2' T of the soil at minus 25 DEG C to be equal to 25 DEG C, and taking the unfrozen water content nw '2jamaa2' T as the residual water content wr; S3, for the soil sample, giving the change rule of the ratio of the unfrozen water content to the initial volume water content in the soil at minus 25 DEG C and minus 2 DEG C and the ratio of the unfrozen water content in the soil at minus 25 DEG C and minus 24 DEG C; S4, determining the rule that the nucleation rate Jhet changes along with the temperature between 0 DEG C and minus 25 DEG C; and S5, determining the unfrozen water content of the to-be-detected soil at different temperatures. According to the method, the calculation mode of the unfrozen water content is provided, the change rule of the nucleation rate of the moisture in the soil along with the temperature is determined, the unfrozen water content of the soil at different temperatures can be calculated only by measuring the initial volume water content of the soil to be measured, and a data basis is provided for related research of the silty clay.
Description
technical field [0001] The invention relates to soil water content testing, in particular to a method for determining liquid water content at different temperatures in soil. Background technique [0002] Saline soil is widely distributed in my country, and the sum of permafrost and seasonal permafrost areas accounts for more than 70% of the total area. The engineering properties of permafrost are closely related to temperature. As the ambient temperature changes, the moisture / ice crystals in permafrost freeze / thaw repeatedly, which affects the stability of engineering foundations. Engineering construction in cold regions is faced with frost heaving and thawing caused by the interaction of water and heat, which seriously restricts the construction of infrastructure such as roads, railways and structures. Moisture is the material basis for freezing and thawing of soil, and the change of unfrozen water content directly affects the thermodynamics and deformation characteristics...
Claims
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IPC IPC(8): G06F30/20G01N33/24G06F119/08
Inventor 万旭升邓世磊路建国邱恩喜晏忠瑞尼玛·帕哈迪刘风云
Owner SOUTHWEST PETROLEUM UNIV