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Simple investigation method for salt expansion coefficient of coarse grained saline soil considering gradation and salt content

A saline soil and salt content technology, applied in the field of geotechnical engineering, can solve problems such as difficult to adapt to the survey requirements along the railway, complicated test process, time-consuming and labor-intensive, etc., to achieve parameters that are easy to test, simple and fast to operate, and overcome technical deficiencies Effect

Inactive Publication Date: 2019-06-14
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the salt expansion coefficient of coarse-grained saline soil is mainly determined through indoor or field tests with reference to the "Building Code for Saline Soil Areas" (SY / T0317-2012). huge survey needs

Method used

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  • Simple investigation method for salt expansion coefficient of coarse grained saline soil considering gradation and salt content
  • Simple investigation method for salt expansion coefficient of coarse grained saline soil considering gradation and salt content
  • Simple investigation method for salt expansion coefficient of coarse grained saline soil considering gradation and salt content

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Embodiment

[0029] A high-speed railway embankment is built in a saline soil area. Most of the borrow areas in this area are saline soil. Therefore, it is planned to collect coarse-grained saline soil from a certain site to be used as embankment filler. Due to strict requirements on deformation control of high-speed railway embankment , in order to avoid the subgrade arching disease during the operation period, the salt expansion coefficient of the coarse-grained saline soil on the site needs to be surveyed and mastered before subgrade filling.

[0030] Adopt the method of the present invention to survey and determine the salt expansion coefficient of 4 groups of coarse-grained saline soil samples of this borrow field below, concrete steps are as follows:

[0031] (1) Through indoor geotechnical sieving and chemical titration tests, determine the particle grading curve of coarse-grained saline soil, see figure 1 Determine the soluble salt content ζ of coarse-grained saline soil, see Table...

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Abstract

The invention discloses a simple investigation method for salt expansion coefficient of coarse grained saline soil considering gradation and salt content. The salt expansion coefficient of the coarsegrained saline soil is investigated scientifically and reasonably, and implementation is convenient, the process is clear, and the simple investigation method can adapt to requirements of investigation and design of the coarse grained saline soil. The simple investigation method comprises the following steps that (1), through indoor geotechnical screening and a chemical titration test, a gradationcurve of coarse grained saline soil particles is determined, and soluble salt content zeta of the coarse grained saline soil is determined; (2) according to the gradation curve of the coarse grainedsaline soil particles in the step (1), the ratio of the coarse particle size to the fine particle size R5 of the coarse grained saline soil is determined by the following formula: R5=A / B; and (3), a salt expansion coefficient eta of the coarse grained saline soil is determined by the following formula (please see the specifications for the formula).

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a simple investigation method for the salt expansion coefficient of coarse-grained saline soil in consideration of gradation and salt content. technical background [0002] Saline soil is a general term for a class of soils with different degrees of salinization, which has the characteristics of salt expansion, dissolution and corrosion, and is widely distributed in arid, semi-arid and coastal areas of various countries. Coarse-grained saline soil has good mechanical properties. In the construction of high-speed railways and highways, there have been precedents of using coarse-grained saline soil to fill embankments. Salt expansion coefficient can not only be used to judge the salt expansion of coarse-grained saline soil, but also can be used to determine the salt expansion of saline soil, such as "Saline Soil Area Building Code" (SY / T 0317—2012) saline soil foun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N31/16
Inventor 陈伟志李安洪姚裕春吴沛沛刘剑光胡会星张莎莎周川滨龙君滔吴刚
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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