Study on the Influence of Pit Excavation on the Stability of Underground Openings Using Different Models

Abstract:

Simplified plane strain model and 3-D model were used to research the influence of pit excavation on the stability of underground openings using the finite element method (FEM). Conclusion from the 3-D FEM study is that the central region of the pit will have a large springback deformation and the openings will also float up at the same time because of large ranges of pit excavation. When using the simplified two-dimensional plane strain model for the analysis of this problem, the size of the excavation region leads directly to two completely inconsistent results. If the excavation region was wider than the openings the springback deformation would be obtained, while the settlement would be obtained if the opening was wider than the excavation region. Therefore the two-dimensional plane strain model is not proper for the analysis of the stability of the openings under this condition.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 1466-1469
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.1466
• Online since: August 2013
• Authors: Ya Xin Yang, Guo Jian Shao, Jing Fu Yu, Guang Yuan Chen
• Keywords: Comparison, Pit Excavation, Plane Strain Model, Stability, Underground Openings

References

[1] O'Reilly M P and New B M. Tunneling induced ground movements: predicting the magnitude and effects[A] in: James D Geddes eds. Proc. 4th Int. Con. On Ground Movements and Structures[C], Pentech Press, London, 1992, 671-697.

[2] Mroueh H and Shahrour I. A full 3D finite element analysis of tunneling-adjacent structures iteraction[J]. Computers and Geotechnics, 2003, 30: 245-253.

DOI: 10.1016/s0266-352x(02)00047-2

[3] Yinren Zheng, Yanmin Zhao and Dongsheng Liu. Treatment on subgrade under ten-story building with shallow underground opening. Chinese Journal of Rock Mechanics and Engineering, 1996, 15(4): 377-384 (In Chinese).

[4] Runqiu Huang, Shangqiao Chen, Jiayu Huang and Ping He. A study on the safety thickness of roof of shallow underground excavation. Journal of Engineering Geology, 1998, 6(2): 120-127 (In Chinese).

[5] Boping Zhang, Yaodong Ye and Yin Wu. Bracing and construction of foundation pit above metro tunnel [J]. Building Technique Development, 2004, 31(4): 63-64 (In Chinese).

[6] Xuhui Li, Qinghua Huang. Stability analysis of the shelter caves under the tall buildings [J]. Guangdong Civil Engineering and Construction, 2001, (9): 12-14 (In Chinese).

[7] Qing Zhang. Correct calculation of excavation released load using finite element method [J]. Journal of Hohai University, 1999, 27(3): 112-115 (In Chinese).