A Determination Method of Optimum Cohesion Freeze Moisture Content of Cohesionless Soil

A non-cohesive soil and measurement method technology, which is applied in the field of soil mechanical performance testing of geotechnical engineering, can solve the problems of easy tilting, inability to make and form, and triaxial samples are easy to scatter, so as to achieve the reduction of cohesion, Solve the effect of easy scattering and tilting

Active Publication Date: 2017-08-22
SHAOXING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for measuring the optimum cohesive frozen water content of cohesive soil, so as to solve the defects in the prior art that the triaxial sample is easy to scatter and tilt after forming, and even cannot be formed.

Method used

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  • A Determination Method of Optimum Cohesion Freeze Moisture Content of Cohesionless Soil
  • A Determination Method of Optimum Cohesion Freeze Moisture Content of Cohesionless Soil
  • A Determination Method of Optimum Cohesion Freeze Moisture Content of Cohesionless Soil

Examples

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Embodiment 1

[0047] In the k5+150~k6+200 section of a high-speed railway, the roadbed has local sandy soil, which is a typical cohesive soil. Since the subgrade will be subjected to cyclic dynamic loads from trains, it is necessary to carry out triaxial mechanical properties testing of the reshaped sand. In order to prepare high-quality triaxial samples, the optimum cohesive freezing moisture content of the cohesive soil should be determined by direct shear test first.

[0048] For above-mentioned example, adopt the assay method of a kind of cohesive-free soil optimum cohesive freezing moisture content of the present invention, measure, comprise the steps:

[0049] (1), dry soil preparation:

[0050] According to the number N and dry density R of the designed direct shear samples, calculate the mass M of the dry state of the cohesive soil required for the direct shear test 2 .

[0051] N 2 =2*n 1 *n 2

[0052] m 2 =N 2 *3.14*(D / 2) 2 *h*R

[0053] Among them, n 1 is the number o...

Embodiment 2

[0084] Embodiment 2: application embodiment.

[0085] The optimal cohesion freezing water content that embodiment 1 measures is used for the sample preparation of cohesionless soil triaxial sample, specifically as follows:

[0086] 1. Preparation of mixed soil materials:

[0087] According to the design sample dry density R, the number of triaxial samples N 1 and the number of auxiliary direct shear samples N 2 , to calculate the mass M of the cohesionless soil in the dry state required for the triaxial specimen and the auxiliary direct shear test 1 and M 2 .

[0088] According to the optimum coagulation freezing water content W measured in Example 1, calculate the mixing water quality M added 3 = M 1 *W, for mixing to prepare cohesion-free soil mixture.

[0089] 2. Freezing of mixed soil materials:

[0090] Freezing the mixed non-cohesive soil material after mixing, preferably, the freezing temperature is -10°C, and the freezing time is 24 hours.

[0091] 3. Single s...

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Abstract

The invention discloses a method for measuring the optimal cohesive frozen water content of cohesive soil, which belongs to the technical field of soil mechanical performance testing and comprises the following steps: (1), dry soil preparation; (2), mixed soil material preparation; (3), making direct shear samples in frozen state; (4), direct shear test in frozen state; (5), direct shear test in normal temperature state; (6), calculation of friction angle and cohesion force; (7), comprehensive evaluation . The present invention determines the optimum cohesive freezing moisture content of the cohesive soil through the cohesion and friction angle of the cohesive soil measured by the normal temperature state and the frozen state direct shear test, which is to increase the cohesion-free soil in the sample preparation process by the freezing process. The premise of a triaxial sample preparation method that reduces the cohesive force and reduces its friction angle can solve the defects in the prior art that the triaxial sample is easy to scatter and tilt after forming, and it is difficult to make a standard cylindrical shape. .

Description

[0001] Technical field: [0002] The invention relates to a method for measuring the optimal cohesive frozen water content of non-cohesive soil, which belongs to the field of soil mechanical performance testing in the discipline of geotechnical engineering. [0003] Background technique: [0004] Cohesionless soil represented by sandy soil is one of the main components of the foundation of buildings and structures. At present, the testing of the mechanical properties of cohesionless soils is usually done through conventional triaxial tests, in which the soil is made into a cylindrical standard triaxial specimen for loading testing. Therefore, making high-quality remodeled cohesion-free soil samples is a prerequisite for this test. [0005] However, since the cohesive soil has no cohesive force and the friction angle is large, the triaxial sample is easy to scatter and tilt after being formed by the traditional sample preparation method, and it is even impossible to make a shap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/10
Inventor 李娜王伟张芳吴刚张陈雷璐璐张旻玉
Owner SHAOXING UNIVERSITY
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