Computation method for frost heaving characteristic for deep seasonal frozen ground subgrade

A technology of deep seasonality and calculation methods, applied in calculation, special data processing applications, instruments, etc., can solve problems such as lack of guiding significance and insufficient micro-mechanism research, and achieve the effect of stable quality

Inactive Publication Date: 2009-04-29
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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Problems solved by technology

[0005] The present invention provides a calculation method for the frost heaving characteristics of deep seasonal frozen soil subgrades, so as to overcome the problems in the prior art that the research on the microcosmic mechanism of the freezing process is not deep enough and has no guiding significance

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  • Computation method for frost heaving characteristic for deep seasonal frozen ground subgrade

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Embodiment Construction

[0008] The present invention will be described in detail below in conjunction with examples.

[0009] The frost heave of the soil is caused by the freezing volume expansion of some water in the original pores of the soil when the soil temperature drops below the freezing point, and more importantly, the migration and accumulation of water in the unfrozen area to the freezing front under the action of the soil water potential gradient. And freeze, caused by volume expansion. The ratio of frost heave amount to the thickness of the frozen soil layer is often used as the characteristic value of soil frost heave deformation, that is, the frost heave rate η (or frost heave strength, frost heave coefficient), expressed in percentage.

[0010] η = Δh h × 100 ( % )

[0011] In the formula: h—thickness of frozen soil, mm;

[0012] △h—Incremental va...

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Abstract

The invention relates to the technical field of road construction projects in permafrost regions, in particular to a method for calculating the frost heave characteristics of deep seasonal frozen soil subgrade. The invention is to overcome the defects that in the prior art, the study on the microscopic mechanism of a freezing process is not deep enough and does not have a meaning of guidance. The solution is the method for calculating the frost heave characteristics of the deep seasonal frozen soil subgrade which comprises the calculations based on the following factors, (1) the effect of soil particle size, (2) the effect of soil density, (3) the effect of temperature, and (4) the effect of water.

Description

Technical field: [0001] The invention relates to the technical field of road construction engineering in permafrost regions, in particular to a calculation method for frost heave characteristics of deep seasonally frozen soil subgrades. Background technique: [0002] One of the main factors affecting the stability of subgrades in deep seasonally frozen regions is subgrade frost heave. Subgrade frost heaving includes subgrade filling frost heaving and frost heaving of the soil below the base. The main factors affecting subgrade frost heaving can be divided into two aspects: one is internal factors, that is, the lithological composition, water content, and salt content of frozen soil. The second is the external factors, namely air temperature, freezing rate and precipitation, that is, soil, water and temperature factors that determine the characteristics of the freezing process of the soil. [0003] At present, the research on the characteristics of soil frost heaving mainly ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42G06F19/00
Inventor 葛建军曹元平包黎明王平李金城
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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