|Table of Contents|

Influence of Quartz on Mechanical Property of Modified Loess with Consolid System(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年02期
Page:
60-68
Research Field:
Publishing date:

Info

Title:
Influence of Quartz on Mechanical Property of Modified Loess with Consolid System
Author(s):
TIAN Wei1 ZHANG Xu-dong1 JIA Neng1 LI Teng1 XU Shang-jie2
1. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. Xigaze Municipal Water Resources Bureau, Xigaze 875000, Xizang, China
Keywords:
geotechnical engineering consolid system improved loess uniaxial compressive strength quartz powder
PACS:
TU411.3
DOI:
10.19815/j.jace.2020.07087
Abstract:
In order to further improve the strength of the existing loess and solve the problem of high cost of loess improvement, based on the performance of modified loess with consolid system and its improvement mechanism, it was proposed for the first time that quartz powder with different fineness and content(the quartz powder used in the experiment comes from the waste sand of 40, 200 and 1 000 mesh)was added to improve the consolid system to improve the performance. Through uniaxial compression test, the optimal ratio of quartz powder in the modified loess with consolid system was determined, and the influences of the fineness and content of quartz powder on the compressive strength, stress-strain curve, failure pattern and internal friction angle of the improved loess were discussed. Combined with scanning electron microscope, the improvement mechanism was discussed, and the Mohr-Coulomb strength theory was further used to analyze the change rule of cohesive force and internal friction angle under the condition of double mixing. The study results show that the strength of loess can be improved by adding quartz powder and consolid system alone, and the compressive strength of loess can be significantly improved by adding 10%(mass fraction)and 200 mesh of quartz powder in the process of modified loess with 2% consolid system. Through scanning electron microscope test, it is concluded that the consolid system mainly adopts the skeleton particles in the original part of the cohesive loess formed by agglomerating 200 mesh of quartz powder to improve the loess strength. The addition of consolid system and quartz powder also affects the stiffness and deformation performance of the modified loess. In addition, quartz powder with different particle size also has different effects on the internal friction angle of loess.

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Last Update: 2021-03-20