|Table of Contents|

Diffusion Characteristics of Grouting Slurry in Sandy Stratum(PDF)

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

Issue:
2020年05期
Page:
182-192
Research Field:
Publishing date:

Info

Title:
Diffusion Characteristics of Grouting Slurry in Sandy Stratum
Author(s):
ZHOU Feng1;  XU Yong1;  ZHU Rui2;  SONG Zhu1;  ZHAI De-zhi3;  MOU Yu-min1
1. School of Transportation Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China; 2. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, Jiangsu, China; 3. China Southwest Geotechnical Investigation &
Keywords:
permeation grouting;  linear regression;  slurry diffusion radius;  strength
PACS:
TU473.1
DOI:
10.19815/j.jace.2019.11083
Abstract:
The river sand in Nanjing area was divided into sand with different particle sizes after sieving through the screens with 5, 2, 0.5 and 0.2 mm mesh holes, respectively. According to the needs of the test and taking the permeability coefficient as the control index, the river sand used was proportioned to simulate four kinds of gravel soil layers. The indoor simulation grouting test was carried outthrough a self-developed infiltration grouting device, and the diffusion characteristics of slurry under the influence factors of different grouting amounts, water cement ratios and grouting pressures of four kinds of sand samples with different particle grading were studied. On this basis, the multiple linear regression analysis was carried out. The results show that the main influencing factors of the slurry diffusion radius are grouting pressure, permeability coefficient and water cement ratio; the main influencing factors of grouting volume are grouting pressure, permeability coefficient and water cement ratio; the main influencing factors of the strength of the nodule are water cement ratio, permeability coefficient and grouting pressure; the slurry diffusion radius, grouting volume and grouting pressure are obtained by combining the experimental results. The quantitative relationship between core strength and permeability coefficient, water cement ratio of slurry and grouting pressure is obtained; the effective radius of slurry diffusion radius in sand formation is about 75%-80% of the initial radius; the slurry diffusion behavior in sand formation has the possibility of coexistence of multiple slurry diffusion modes. The test results can be used for reference in similar projects.

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Last Update: 2020-10-15