A Method for Determining Salt-Frost Heave Force of High Salt Saline Soil

A determination method and saline soil technology, applied in the field of geotechnical engineering, can solve the problems of unfavorable engineering promotion and application, heavy test workload, and long test time, and achieve clear implementation process, improved determination speed, and strong operability Effect

Active Publication Date: 2021-02-02
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of indoor salt-frost heave test to determine the salt-frost heave force of saline soil are that the test takes a long time, requires high equipment, and the test workload is large, which is not conducive to the promotion and application of engineering, and there are few existing specifications, documents, and patents. and a simple method for determining the salt-frost heaving force of high-saline saline soil

Method used

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  • A Method for Determining Salt-Frost Heave Force of High Salt Saline Soil
  • A Method for Determining Salt-Frost Heave Force of High Salt Saline Soil
  • A Method for Determining Salt-Frost Heave Force of High Salt Saline Soil

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Embodiment

[0038] A high-speed railway embankment project is built on saline soil foundation. During the railway survey period, it is necessary to determine the salt-frost heaving force at different depths of the saline soil foundation, which is determined by the method of the present invention. Specific steps are as follows:

[0039](1) Determine the natural water content w, porosity n, Poisson's ratio υ, and salt content s of high-salt saline soil through on-site sampling and indoor geotechnical tests; determine the compressive strength E of high-salt saline soil c , unit: kPa; determine the temperature T at the initial precipitation of crystallized salt in high-salt saline soil m , unit: ℃; determine T=T f = Water content of high-salt saline soil at 0°C w 0 , the results are shown in Table 1 and Table 2.

[0040] It can be seen from Table 2 that s / w=0.641>0.072, so the saline soil foundation is high-salt saline soil.

[0041] (2) Determine the minimum temperature T of the high-sal...

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Abstract

A method for determining the salt-frost heave force of high-salinity saline soil is used to determine the salt-frost heave force of high-salt saline soil area through scientific and reasonable investigation, which meets the needs of actual engineering investigation. It includes the following steps: determine the natural water content w, porosity n, Poisson's ratio υ, salt content s, and compressive strength E of high-salt saline soil through on-site sampling and indoor geotechnical tests c ; Determining the initial precipitation temperature T of high-salt saline soil crystallization salt m , T=T f = Water content of high-salt saline soil at 0°C w 0 ; Determine the minimum temperature T of the high-salt saline soil during the cooling period through in-situ testing on the spot; determine the non-phase-transition water content ratio w of the high-salt saline soil when the crystallized salt is precipitated u1 ; Determining the unfrozen water content ratio w of high-salt saline soil when ice-water phase transition u2 ; Determine the salt-frost heaving force σ of high-salt saline soil by the following formula e :

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for determining the salt-frost heaving force of high-salt saline soil. [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 foundations, especially shallow saline soils, have obvious salt-frost heaving deformation characteristics, which can easily lead to uplift and cracking of engineering structures. For high-speed railways, especially high-speed ballastless subgrade projects, salt Soil-salt-frost heaving forces may cause track irregularities to increase, threatening the safe operation of trains at high speeds. High-salt saline soil refers to saline soil with high salt content. During the cooling process, the crystalline salt first precipitates to form the salt heave force. As the temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/14G01L5/00
CPCG01L5/00G01N25/14
Inventor 陈伟志李安洪胡会星谢毅吴沛沛郭在旭张莎莎刘刚张林李楚根姚裕春李宁唐第甲王雨佳叶丹雷洋朱建辉
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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