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Considering the repeated action of low temperature, the deep investigation method of the layer affected by severe temperature in saline soil

A technology of repeated action and saline soil, applied in the field of geotechnical engineering, to achieve the effect of strong operability, simple and fast operation, and clear implementation process

Active Publication Date: 2021-06-04
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing norms, scientific journals, patent documents, etc. have not yet involved the severe impact depth of saline soil under repeated cooling conditions, that is, the depth of the severe temperature impact layer

Method used

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  • Considering the repeated action of low temperature, the deep investigation method of the layer affected by severe temperature in saline soil
  • Considering the repeated action of low temperature, the deep investigation method of the layer affected by severe temperature in saline soil
  • Considering the repeated action of low temperature, the deep investigation method of the layer affected by severe temperature in saline soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A high-speed railway coarse-grained saline soil subgrade has a filling height of 6.3m, a top surface width of 13.6m, and a side-slope ratio of 1:1.5. In order to avoid surface salinization in the design of this subgrade, it is necessary to determine the coarse-grained saline soil In order to take effective engineering measures to eliminate the salinization disease, the severe air temperature affects the depth of the layer, and now the method of the present invention is used to determine the depth of the severe air temperature affected layer of the coarse-grained saline soil subgrade after 5 repeated low temperature actions.

[0040] Specific steps are as follows:

[0041] (1) Determine the temperature at different depths below the top surface of the coarse-grained saline soil subgrade through in-situ monitoring for not less than one year, such as figure 1 shown; determine the minimum temperature and critical initial temperature T in one year at different depths h below ...

Embodiment 2

[0056]A low embankment of a high-speed railway has a filling height of 0.5m and a top surface width of 13.6m. Determining the depth of the intense temperature-affected layer of the saline soil foundation, in order to take effective engineering measures to eliminate salinization diseases, the method of the present invention is used to determine the depth of the severe temperature-affected layer of the saline soil foundation after 15 repeated low temperature actions.

[0057] Specific steps are as follows:

[0058] (1) Determine the temperature at different depths below the top surface of the coarse-grained saline soil subgrade through in-situ monitoring for not less than one year, such as figure 1 shown; determine the minimum temperature and critical initial temperature T in one year at different depths h below the top surface of the coarse-grained saline soil embankment 0 (T 0 Take the temperature difference ΔT at 20°C), such as Figure 4 shown;

[0059] (2) Drill holes to...

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Abstract

Considering the repeated action of low temperature, the survey method of the depth of the severe temperature-influenced layer of saline soil can scientifically and reasonably determine the depth of the severe temperature-affected layer of saline soil, and it is convenient to implement, the process is clear, and it can meet the needs of actual engineering construction. It includes the following steps: determine the temperature at different depths below the top surface of saline soil through in-situ monitoring for not less than one year, and determine the minimum temperature and critical initial temperature at different depths h below the top surface of saline soil in one year T 0 The temperature difference ΔT; collect saline soil samples and conduct indoor geotechnical tests to determine the initial void ratio e of saline soil 0 ; Determine parameters α, λ, η: determine the allowable temperature difference [ΔT] of the depth of the severe temperature-influenced layer of saline soil; determine the depth of the severe temperature-affected layer of saline soil [h] considering the repeated action of low temperature by the following formula:

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for investigating the depth of a layer affected by intense temperature in saline soil in consideration of repeated action of low temperature. [0002] technical background [0003] Saline soil refers to the collective name of different degrees of saline-alkali soil, which is widely distributed in arid, semi-arid and coastal areas all over the world. Saline soil is different from general soil, and even more special and complex than permafrost, expansive soil and subsidence loess. Saline soil foundations, especially shallow saline soils, have obvious unfavorable characteristics such as dissolution, salt swelling and corrosion, which pose a serious threat to engineering structures in saline soil areas. [0004] Under the repeated effect of atmospheric cooling on saline soil, water and salt rapidly migrate and accumulate to the cold end of the top surface of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
Inventor 陈伟志李安洪吴沛沛谢毅张莎莎杨晓华李楚根胡超周川滨
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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