Analysis of Existing Tunnels Deformation Induced by New Othogonal Tunneling Using Park Convergence Model
[1]JIN Junwei,FU Boyi,CHEN Yunbin,et al.Analysis of Existing Tunnels Deformation Induced by New Othogonal Tunneling Using Park Convergence Model[J].Journal of Zhengzhou University (Engineering Science),2022,43(01):76-82.[doi:10.13705/j.issn.1671-6833.2022.01.012]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
43卷
Number of periods:
2022 01
Page number:
76-82
Column:
Public date:
2022-01-09
- Title:
- Analysis of Existing Tunnels Deformation Induced by New Othogonal Tunneling Using Park Convergence Model
- Keywords:
- tunnel excavation; displacement controlled method; numerical analysis; convergence model; existing tunnels
- CLC:
- TU454
- DOI:
- 10.13705/j.issn.1671-6833.2022.01.012
- Abstract:
- Due to the complexity of the traditional force controlled method in analyzing the deformation process of the ground and the existing tunnels caused by the orthogonal under-crossing of the tunnel, the displacement controlled method was adopted in this article to analyze the influence of tunnel excavation on the ground settlement and the longitudinal deformation of the arch bottom of the existing tunnels based on Park’s convergence model that described more realistic tunnel boundary deformation. Firstly, through the comparison of the mea-suring data with the calculation results of the method in this paper and the force controlled method, the feasibility of the displacement control method under newly built tunnels under-crossing existing tunnel was verified, and then the four tunnel convergence modes of Park were used as the boundary conditions on the new tunnel for further analysis. The comparison between the calculated results and the actual measurements showed that the results of the displacement control method for natural site settlement were very close to the measured data. The calculation results showed that, given the displacement of the tunnel vault g, there were certain differences in the shape and value of the ground settlement trough and the deformation of tunnel arch bottom caused by Park’s four convergence models. With the same soil loss and g value, the effects of convergence mode on surface settlement and the deformation of tunnel arch bottom were circular non-uniform convergence, elliptical convergence, elliptic non-uniform convergence, and uniform convergence in descending order. Among them, the effect of elliptical convergence and non-uniform convergence of ellipse was relatively close, while the uniform convergence and the actual measurements had the worst fitting effect. Surface settlement caused by tunnel construction and the deformation mode of existing tunnel was different, the surface settlement appeared as a Gaussian curve while the tunnel deformation may appear as a “W” shape when the distance between the tunnels was constant.
- References:
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Last Update:
2022-01-09