Stability Analysis of Neighborhood Tunnels with Large Section Constructed in Steeply Jointed Rock Mass
To investigate the instability of two neighborhood tunnels with large crossing section during the construction, the Tushan subway station was taken as study background, which was built in steeply jointed rock mass. Based on the excavation method called traditional double side drift, numerical simula...
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Hindawi Limited
2020-01-01
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Series: | Mathematical Problems in Engineering |
Online Access: | http://dx.doi.org/10.1155/2020/9641291 |
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doaj-507ae421e75a4bfdadcf5b8188cc03d22020-11-25T03:56:26ZengHindawi LimitedMathematical Problems in Engineering1024-123X1563-51472020-01-01202010.1155/2020/96412919641291Stability Analysis of Neighborhood Tunnels with Large Section Constructed in Steeply Jointed Rock MassAichen Zheng0Feng Huang1Zhengdong Tang2Zhaoyi He3School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaSchool of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaSchool of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaSchool of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaTo investigate the instability of two neighborhood tunnels with large crossing section during the construction, the Tushan subway station was taken as study background, which was built in steeply jointed rock mass. Based on the excavation method called traditional double side drift, numerical simulations of four different face excavation sequences in the two neighborhood tunnels were conducted to optimize construction sequence to improve the stability during tunneling. The results show that first excavation of the right tunnel produced less deformation of the tunnels due to joints dip. The effects of rock mass discontinuities on the stability of the tunnels were studied through comparison between the real condition with joints and the assumed condition without joints. Furthermore, six initial supporting systems with different parameters were compared, and the field observations of deformations along tunnel profile show good agreement with the numerical results. Based on the numerical simulation, the length of rock anchors could be designed asymmetrically, which is more economical than the symmetrical design. The optimized thickness of shot concrete and spacing of steel sets was 35 cm and 60 cm, respectively.http://dx.doi.org/10.1155/2020/9641291 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Aichen Zheng Feng Huang Zhengdong Tang Zhaoyi He |
spellingShingle |
Aichen Zheng Feng Huang Zhengdong Tang Zhaoyi He Stability Analysis of Neighborhood Tunnels with Large Section Constructed in Steeply Jointed Rock Mass Mathematical Problems in Engineering |
author_facet |
Aichen Zheng Feng Huang Zhengdong Tang Zhaoyi He |
author_sort |
Aichen Zheng |
title |
Stability Analysis of Neighborhood Tunnels with Large Section Constructed in Steeply Jointed Rock Mass |
title_short |
Stability Analysis of Neighborhood Tunnels with Large Section Constructed in Steeply Jointed Rock Mass |
title_full |
Stability Analysis of Neighborhood Tunnels with Large Section Constructed in Steeply Jointed Rock Mass |
title_fullStr |
Stability Analysis of Neighborhood Tunnels with Large Section Constructed in Steeply Jointed Rock Mass |
title_full_unstemmed |
Stability Analysis of Neighborhood Tunnels with Large Section Constructed in Steeply Jointed Rock Mass |
title_sort |
stability analysis of neighborhood tunnels with large section constructed in steeply jointed rock mass |
publisher |
Hindawi Limited |
series |
Mathematical Problems in Engineering |
issn |
1024-123X 1563-5147 |
publishDate |
2020-01-01 |
description |
To investigate the instability of two neighborhood tunnels with large crossing section during the construction, the Tushan subway station was taken as study background, which was built in steeply jointed rock mass. Based on the excavation method called traditional double side drift, numerical simulations of four different face excavation sequences in the two neighborhood tunnels were conducted to optimize construction sequence to improve the stability during tunneling. The results show that first excavation of the right tunnel produced less deformation of the tunnels due to joints dip. The effects of rock mass discontinuities on the stability of the tunnels were studied through comparison between the real condition with joints and the assumed condition without joints. Furthermore, six initial supporting systems with different parameters were compared, and the field observations of deformations along tunnel profile show good agreement with the numerical results. Based on the numerical simulation, the length of rock anchors could be designed asymmetrically, which is more economical than the symmetrical design. The optimized thickness of shot concrete and spacing of steel sets was 35 cm and 60 cm, respectively. |
url |
http://dx.doi.org/10.1155/2020/9641291 |
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