吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (5): 1472-1481.doi: 10.13229/j.cnki.jdxbgxb201705019

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Fracture grouting crack growth of collapsible loess based on fracture theory

WANG Teng1, 2, ZHOU Ming-ru1, 2, MA Lian-sheng3, QIAO Hong-xia1, 2   

  1. 1.Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China;
    2.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China;
    3. School of Science,Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2016-06-21 Online:2017-09-20 Published:2017-09-20

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Abstract: In order to study the diffusion mechanism of grout in soil body collapsible loess area, a simulation analysis method of grout flowing diffusion in 2D surface is proposed based on fracture mechanics theory. The formation pattern of crack was described, the failure criterion and judgment method of the crack growth in fracture grouting were established, the problems of crack growth and coupling of seepage and stress were solved. Meanwhile, by setting up the crack growth equation with ABAQUS software, the fracture grouting pressure and the influence of physico-mechanical properties of soil body on the length of crack growth were analyzed. Results show that, to calculate the facture grouting pressure, crack growth length and the soil body strength parameters must be considered. In loess fracture grouting, fracture grouting can not obtained by continuous pressure, which should replaced by segmented pressure to ensure the aggregation of energy in crack growth process. Laboratory model experiments were carried out and the results are in good agreement with that of model analysis, verifying the proposed simulation analysis method.

Key words: civil engineering, collapsible loess, fracture grouting, crack length, fracture mechanics, stress coupling, expansion path

CLC Number: 

  • TU472.6
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