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Design manufacturing and application of triaxial penetration tester

A geotechnical test, permeability coefficient technology, applied in permeability/surface area analysis, scientific instruments, measuring devices, etc., can solve problems such as rough permeability coefficient

Inactive Publication Date: 2012-01-18
申坤 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The permeability coefficient measured by various methods currently used indoors and on site is still a relatively rough value. In fact, the measurement method of the permeability coefficient is still under research and improvement.

Method used

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  • Design manufacturing and application of triaxial penetration tester
  • Design manufacturing and application of triaxial penetration tester
  • Design manufacturing and application of triaxial penetration tester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0081] 1. Experimental steps

[0082] 1. The permeability of the soil is the ability of water to flow through the pores of the soil. Obviously, the pore size of the soil determines the size of the permeability coefficient. Therefore, when measuring the permeability coefficient, it is necessary to explain the density state of the soil that is compatible with the permeability coefficient or the void ratio of the soil. According to the standard method of the triaxial test, use the molding cylinder to make the original soil sample (or disturbed soil sample). If the soil sample needs to be saturated, the saturation method includes vacuum pumping and water immersion saturation method. The soil sample with better permeability can be The water head saturation is used in the infiltration container, and the soil sample with high viscosity can be saturated by increasing the osmotic pressure. For undisturbed soil samples, samples can be taken on site with a soil sampler and ring cutter, a...

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Abstract

Design manufacturing and application of a triaxial penetration tester of the invention breaks through the limitation of permeability coefficient testing in Standard for soil test method GB / T50123-1999 and Specification of soil test SL237-014-1999. According to the invention, the tester is designed based on a varying-head principle; with water head with a height of up to 47 m provided by an air compressor, a constant head can be used to process the test results. Coarse grained soil and fine grained soil can be calculated both by a constant head and by a varying head, and the results are of the same order of magnitude and are quite close to each other. The tester of the invention comprises an air compressor, a penetration tester frame, a triaxial penetration pressure chamber, a liquid level sensor, a test data collector and a receiver, a data processing software, and a computer. Data are read on-line, are stored automatically, and samples of 10-9 cm / s or lower can be tested. The tester of the invention can test permeability coefficients of undisturbed soil, disturbed soil, and additive mixtures of soil and cement. The sample preparation method is simple and practical; the test is rapid and convenient, and covers the application fields which require permeability coefficient testing in soil mechanics or materials science.

Description

technical field [0001] The present invention relates to the design and manufacture for testing low permeability coefficient (10 -9 cm / s order) sample triaxial penetration testing instrument. The sample to be tested can be pure soil material, or a mixture of soil and cement, fly ash, fine powder slag, volcanic ash or coal gangue; but other materials such as soil and dolomite, montmorillonite, illite, kaolinite, Non-metallic minerals such as zeolite and diatomaceous earth; various combinations of all the above products can also be used to form samples containing calcium silicate or hydrated calcium silicate mineral components. As long as the final test sample forms a certain density, has a certain strength, hardness, cohesiveness, fluidity and water retention, it can be tested on the triaxial permeability tester for permeability coefficient. Background technique [0002] Because the factors affecting the permeability coefficient are very complicated, such as the particle com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 申坤杨熙章宋云
Owner 申坤
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