Calculation of Static Safety Coefficient about Loess Cave

Abstract:

For the loess cave characteristics, such as the thin coverage soil layer at the hole top, the poor self-stabilizing capacity, the large disturbance deformation after excavation and the easy collapse, thus in this paper, the loess cave safety factor is obtained by the method of strength reduction. And the stability calculation analysis is much more perfect. The Northwest Area Lishi loess cave is used in this paper, and the idea of strength reduction finite element method is applied, based on the Drucker-Prager yield criterion, the loess cave static stability analysis is made by the software of ANSYS.The results show that the actual situation can be reflected by the method of finite element strength subtraction. And the obtained loess cave stability coefficient is much closer to the actual steady state, thus showing the certain advantages of stability analysis.The method is also adopted in this paper. And its feasibility can be applied to the engineering practice, also a theoretical basis of reference is provided for engineering application.

• Periodical: Advanced Materials Research (Volumes 189-193)
• Pages: 2366-2370
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.2366
• Online since: February 2011
• Authors: Jun Hong Li
• Keywords: Calculation Analysis, Loess Cave, Result, Safety Factor, Strength Reduction Method

References

[1] G.X. Chen, Geotechnicalearthquake engineering, Beijing: Science Press, 2007. (In Chinese).

[2] F. Gao, X. Ren, Seimic responses analysis of a loess cave,. Journal of Lanzhou Railway University (Natural sciences), Vol. 20, No. 3, 12-18, 2001. (In Chinese).

[3] Z.Q. Gu, S.Z. Peng, Z.K. Li, Underground tunel engineering, Tsinghua University Press, 1994. (In Chinese).

[4] Z.D. Liu, Mechanics of loess and engineering, Xi¢an: Shanxi Science and Technology Press, 1997. (In Chinese).

[5] W.B. Luo, China loess and the structure of our cave-homes, Journal of Underground Space and Engineering, Vol. 3, No. 3, 45-51, 1982. (In chinese).

[6] C.Y. Qiu, Y.R. Zheng, Y.K. Song, Exploring the safety factors of unlined Loess tunnel by ANSYS, Journal of Underground Space and Engineering, Vol. 5, No. 2, 291-296, 2009. (In chinese).

[7] L.M. Zhang, Y.R. Zheng, et al., Finite element method of strength subtraction using in the road tunnel, Rock and Soil Mechanics, Vol. 28, No. 1, 97-101, 2007. (In chinese).

[8] Y.R. Zheng, S.Y. Zhao, et al., Finite element analysis development and its applications in engineering , China engineering science, Vol. 8, No. 12, 39-61, 2006. (In chinese).

[9] Y.R. Zheng, C.Y. Qiu, H. Zhang, et al., The exploration About soil tunnels of surrounding stability analysis methods, Rock and Soil Mechanics, Vol. 27, No. 10, 2008. (In chinese).

[10] H. Zhang, Y.R. Zheng, Z. Yang, et al., Exploration of safety factors of the loess tunnel, Chinese Journal of Underground Space and Engineering, Vol. 5, No. 2, 297-306, 2009. (In chinese).

[11] J.B. Zhou, J.P. Xu, Theory and calculation of soil dynamics, China Building Industry Press, 2001. (In chinese).