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High-salinity salinized soil salinity-frost heaving force determining method

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

Active Publication Date: 2019-03-19
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 engineering popularization and application, 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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  • High-salinity salinized soil salinity-frost heaving force determining method

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Embodiment

[0037]A high-speed railway embankment project is built on the saline soil foundation. During the railway survey period, it is necessary to determine the salt-frost heave force at different depths of the saline soil foundation, which is determined by the method of the present invention. Specific steps are as follows:

[0038] (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℃ 0 , the results are shown in Table 1 and Table 2.

[0039] It can be known from Table 2 that s / ω=0.641>0.072, so the saline soil foundation is high-salt saline soil.

[0040] (2) Determine the minimum temperature T of the high-salt ...

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Abstract

Disclosed is a high-salinity salinized soil salinity-frost heaving force determining method. The high-salinity salinized soil salinity-frost heaving force determining method achieves determination ofthe salinity-frost heaving force of the high-salinity salinized soil in salinized soil areas through scientific and reasonable investigation to meet the demands of practical engineering. The high-salinity salinized soil salinity-frost heaving force determining method comprises the following steps of, through field sampling and indoor geo-technical testing, determining the natural moisture contentw, the porosity n, the Poisson ratio u, the salinity s and the compressive strength Ec of the high-salinity salinized soil; determining the initial precipitation temperature Tm of the high-salinity salinized soil, and determining the moisture content w0 of the high-salinity salinized soil when T=Tf=0 DEG C; through field in situ testing, determining the minimum temperature T of the high-salinity salinized soil during cool-down; determining the phase-unchanged moisture ratio wu1 of the high-salinity salinized water during precipitation of crystalized salt; determining the unfrozen moisture ratio wu2 of the high-salinity salinized water during ice-water phase change; calculating the salinity-frost heaving force sigma e of the high-salinity salinized water through the following formula.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for determining the salt-frost heave force of high-salt saline soil. technical background [0002] Saline soil refers to the general designation 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 temperature ...

Claims

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Application Information

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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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