Testing method of soil mass triaxial breaking stress path based on negative confining pressure condition

A technology of failure stress and test method, which is used in soil material testing, testing material strength using stable tension/pressure, material inspection products, etc., and can solve problems such as difficult technical methods

Active Publication Date: 2017-12-15
XIAN UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a test method based on the triaxial failure stress path of the soil under the negative confining pressure con

Method used

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  • Testing method of soil mass triaxial breaking stress path based on negative confining pressure condition
  • Testing method of soil mass triaxial breaking stress path based on negative confining pressure condition
  • Testing method of soil mass triaxial breaking stress path based on negative confining pressure condition

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Embodiment

[0070] Q 3 The loess is used as the sample soil, the depth of the soil is 5.5m ~ 6.5m, the color is yellow to brownish yellow, and the pores are relatively developed. The natural water content of the loess is 18.55%, and the relative density is 2.71. The specific steps are as follows:

[0071] Step 1. Adopt the method of layered compaction sample preparation to prepare a cylindrical sample 8 with a diameter of Φ39.1mm and a height of 80mm, and the moisture content of the sample 8 is 15%;

[0072] Step 2: Spray 75 environmentally friendly self-spraying self-adhesive evenly on the surface of the 8 sides of the sample obtained in Step 1, let it stand for 15-20 minutes, then apply a layer of Triangle tire glue evenly, and let it stand for 5-10 minutes Then put the rubber film 15 on the film-supporting tube, use ear washing ball to suck air from the air nozzle of the film-supporting tube, so that the rubber film 15 is close to the wall of the film-bearing tube, and then cover the f...

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Abstract

The invention discloses a testing method of a soil mass triaxial breaking stress path based on a negative confining pressure condition. The testing method is based on a uniform section loading axis triaxial instrument. The testing method comprises the following specific steps: preparing a cylindrical sample; applying chemical glue on the side surface of the sample, and putting the sample into a rubber membrane; gluing the sample with a pressure chamber sample base and the end part of a loading axis through super glue after the rubber membrane is glued with the sample; finally performing two types of testing on the sample: performing soil mass triaxial tensile stress route testing in a negative confining pressure condition (NP-TTSP): ensuring that the sample is under isotropic equal tensile stress and the negative confining pressure is not changed, and gradually increasing the axial tensile stress till the sample is broken; performing soil mass triaxial compression stress route testing in a negative confining pressure condition (NP-TCSP): ensuring that the sample is under isotropic equal tensile stress and the negative confining pressure is not changed, and gradually applying axial tensile stress when the axial tensile stress is reduced to zero till the sample is broken. The testing method lays a foundation for the development of strength characteristic research on loess in a tension and shear stress route condition.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering test methods, and relates to a test method based on the triaxial failure stress path of soil under the condition of negative confining pressure. Background technique [0002] Due to the low tensile capacity of soil, the influence of soil tensile strength on geotechnical structures is often neglected. However, the failure of many geotechnical structures is related to the tensile properties of soil. In recent years, with the rapid development of the economy and the vigorous construction of highways, airports, and high earth dam slopes, the problem of cracks in geotechnical structures has always existed, which shows that the impact of the tensile strength of soil on geotechnical structures cannot be ignored. Therefore, it is very important to have a correct understanding of the tensile properties of soil and an accurate measurement of the tensile strength index. [0003] Using a uni...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N33/24
CPCG01N3/08G01N33/24
Inventor 李荣建孙萍慕焕东骆晗刘恩龙霍旭挺王刚张真
Owner XIAN UNIV OF TECH
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