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Numerical simulation of support action of systematic anchorage bolts in shallow-buried loess tunnel(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2011年01期
Page:
59-62
Research Field:
Publishing date:
2011-02-28

Info

Title:
Numerical simulation of support action of systematic anchorage bolts in shallow-buried loess tunnel
Author(s):
CHEN Jian-xun1;  XUAN Jun-jie1; 2;  QIAO Xiong1; 3
1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China;
2. School of Civil Engineering, Northwest University for Nationalities, Lanzhou 730030, Gansu, China;
3. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
Keywords:
tunnel engineering;  loess;  shallow-buried;  systematic anchorage bolt;  arch settlement;  numerical simulation
PACS:
U451.2
DOI:
-
Abstract:
In order to study the actional function of systematic anchorage bolts in shallow-buried loess tunnel, this paper taking Liujiaping 5# tunnel of Wubao—Zizhou freeway as an example, two-dimensional plane models with systematic anchorage bolts and without systematic anchorage bolts were established by using the finite element analysis software MIDAS/GTS. In the process of numerical analysis, the displacement amounts were simulated during the six excavation stages and the stage before secondary lining construction, and the numerical simulating results were compared with the ones of measuring. The results show that the displacement of the model with systematic bolts is bigger than that of the model without systematic bolts during the construction of shallow-buried loess tunnel, because the rock bolts are constructed after steel arch.Construct-ing the anchorage blots, not only the stability of soil mass is broke, but also the best time of constructing shotcrete and steel support is delayed. Moreover, both the two modes have almost the same settlement in the tunnel arch crown and horizontal convergence during in-situ test. Through comprehensive analysis, it is found that the role of systematic anchorage bolts is not obvious in shallow-buried loess tunnel and can be eliminated. 4 tabs, 7 figs, 8 refs.

References:

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Last Update: 2011-02-28