Calculation of Underground Tunnels' Safety Factor Based on the Strength Reduction Technique

Abstract:

The safety of underground tunnels is a key problem of large substructure engineering during excavation and design. A new method to calculate the general safety factor of underground multi-tunnel is put forwarded based on the strength reduction theory. By the way of reducing rock material strength parameters (cohesion strength C and friction angle φ) step by step, the general safety of tunnels is got when the calculated result of excavation simulation shows that the equivalent plastic strain of rock wall becomes connection exactly. Engineering application indicates that the method of underground tunnels strength reduction is very useful for analysis quantitatively the general stability of tunnels and design of substructure.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 1206-1209
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.1206
• Online since: November 2012
• Authors: Cun Peng Shi, Xia Ting Feng, Quan Jiang
• Keywords: Rock Mechanics, Safety Factor, Strength Reduction Theory, Underground Tunnels

References

[1] T. Matsui, K. C. San., Finite element slope stability analysis by shear strength reduction technique. Soil and Foundations,1992,32(1):59-70.

DOI: 10.3208/sandf1972.32.59

[2] ZHENG Ying-ren, ZHANG Yufang, ZHAO Shang-yi, et al. Application of strength reduction fem to YuanJiang mohel expressway cut slope stability analysis[J]. Chinese Journal of Rock Mechanics and Engineering, 24(21): 3812-3817. ( In Chinese)

[3] Ming Lu. Finite element analysis of a pilot gas storage in rock tunnel under high pressure [J]. Engineering Geology, 1998, 49(3):353-361.

DOI: 10.1016/s0013-7952(97)00067-7

[4] P. K. Rajmeny, U. K. Singh, B.K.P. Sinha. Predicting rock failure around boreholes and drivers adjacent to stops in Indian mines in high stress regions [J]. International Journal of Rock Mechanics and Mining Sciences, 2002, 39(2): 151-164.

DOI: 10.1016/s1365-1609(01)00082-x

[5] Luan Maotian, Wang Zhongchang, Yang Qiang., Study on damage bifurcation and instability of rock-like materials. Acta Mechanica Solida Sinica, Vol. 19,No.3: 275-282.

DOI: 10.1007/s10338-006-0633-5

[6] Zienkiewicz O C，Humpheson C and Lewis R W．Associated and Non-Associated Visco-Plasticity and Plasticity in Soil Mechanics [J] Geotechnique, 1975, 25(4)：671-689.

DOI: 10.1680/geot.1975.25.4.671

[7] SHAO Guojian, ZHUO Jiashou, ZHANG Qing. Research on analysis method and criterion of rockmass stability [J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(5): 691-690. ( In Chinese)