On the seismic stability analysis of reinforced rock slope and optimization of prestressed cables

Abstract

The evaluation of the seismic stability of high rock slopes is of vital importance to ensure the safe operation of the hydropower stations. In this paper, an equivalent pseudo-static force analysis based on the finite element method is developed to evaluate the seismic stability of reinforced rock slopes where the prestressed cables are modeled by the bar elements applied with nodal forces and bounded only at the anchored parts. The method is applied to analyze a high rock slope in south-west China and the optimization of cables. The stabilization effects of prestressed cables on the seismic stability of the slope are studied, the simulations of the concrete heading are discussed and the potential failure modes of the shear concrete plug are compared. Based on this, the optimization of cables is studied including the anchor spacing and inclined angles.

Keywords

high rock slope / reinforced system / optimization / prestressed cable / seismicity

References

[1] Janbu N. Slope stability computations. Embankment dam engineering, Casagrand Volume, 1973, 47-86

[2] Sarma S K. Stability analysis of embankments and slopes. Geotechnique, 1973, 23(3): 423-433

[3] Morgenstern N R, Price V E. The analysis of the stability of general slip surfaces. Geotechnique, 1965, 15(1): 79-93

[4] Donald I, Chen Z Y. Slope stability analysis by an upper bound plasticity method. Internal report, Monash university, Clayton, Australia. 1992

[5] Zienkiewicz O C, Humpheson C, Lewis R W. Associated and non-associated visco-plasticity and plasticity in soil mechanics. Geotechnique, 1975, 25(4): 671-689

[6] Zheng Y R, Zhao S Y, Kong W X, Deng C J. Geotechnical engineering limit analysis using finite element method. Rock and Soil Mechanics, 2005, 26: 163-168 (in Chinese)

[7] Celestino T B, Duncan J M. Simplified search for non-circular slip surface. In: Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, Sweden, 1981

[8] Duncan J M. Factors of safety and reliability in geotechnical engineering. Journal of Geotechnical and Geoenvironmental Engineering, 2001, 127(8): 717-721

[9] Michalowski R L. Stability of uniformly reinforced slopes. Journal of Geotechnical and Geoenvironmental Engineering, 1999, 125(1): 84-86

[10] Siad L. Stability analysis of jointed rock slopes reinforced by passive, fully grouted bolts. Computers and Geotechnics, 2001, 28(5): 325-347

[11] Ding X L, Sheng Q, Han J. Numerical simulation testing study on reinforcement mechanism of prestressed anchorage cable. Chinese Journal of Rock Mechanics and Engineering, 2002, 21: 980-988 (in Chinese)

[12] Li N, Zhang P, Li G Y. Discussion on design principle and method of prestressed cable for support of rock slopes. Chinese Journal of Rock Mechanics and Engineering, 2004, 23: 2972-2976 (in Chinese)

[13] Zhu J W, Liu J Y, Wu F Q, . Study on reinforcement technology of deep unloaded joints in left bank of jinping first stage hydropower station and its numerical simulation. Chinese Journal of Rock Mechanics and Engineering, 2007, 26: 2541-2548 (in Chinese)

[14] Chehade F H, Sadek M, Shahrour I. Non Linear Global Dynamic Analysis of Reinforced Slopes Stability Under Seismic Loading. 2009 International Conference on Advances in Computational Tools for Engineering Applications, 2009, 46-51

[15] Eskandarinejad A, Shafiee A H. Pseudo-dynamic analysis of seismic stability of reinforced slopes considering non-associated flow rule. Journal of Central South University of Technology, 2011, 18(6): 2091-2099

[16] Bray J D, Travasarou T. Pseudostatic Coefficient for Use in Simplified Seismic Slope Stability Evaluation. Journal of Geotechnical and Geoenvironmental Engineering, 2009, 135(9): 1336-1340

[17] Liu J, Li J L, Zhang Y D, . Stability analysis of dagangshan dam abutment slope under earthquake based on pseudo-static method. Chinese Journal of Rock Mechanics and Engineering, 2009, 28: 1562-1570 (in Chinese)

[18] Luo Q, Li L, Zhao L H. Quasi-static analysis of seismic stability of anchored rock slope under surcharge and water pressure conditions. Chinese Journal of Rock and Soil Mechanics, 2010, 31: 3585-3593 (in Chinese)

RIGHTS & PERMISSIONS

Higher Education Press and Springer-Verlag Berlin Heidelberg