The Elastoplastic Finite Element Analysis for the Deep Anti-Sliding Stability of Gravity Dam by the Method of Overloading

Abstract:

Combined with engineering requirements of the Qingyu reservoir, the ANSYS finite element software was used to establish an elastoplastic gravity dam calculation model which considered the mechanical properties of weak structural plane of rock in the dam foundation. An analysis based on not only the finite element iteration not converging,the plastic zones in dam foundation rock developing to through the foundation and the mutation in horizontal displacement of feature points, but also the discontinuous variation of the distribution of horizontal displacement of dam foundation rock, the dislocation between the above and below of weak layers and the leap of iterations were took as the criterions to get the deep anti-sliding stability safety factor of gravity dam by gradually increasing the load burdened on the upstream face of the dam. This thesis illustrated the principle of the elastoplastic finite element analysis for the deep stability of gravity dam by the method of overloading, demonstrated the feasibility of this method ,expanded the criterions to determine the safety factor and obtains the safety factor of this practical engineering under the elastoplastic overloading method.

• Periodical: Advanced Materials Research (Volume 1089)
• Pages: 270-276
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1089.270
• Online since: January 2015
• Authors: Jun Rui Pang, Wei Sun, Gang Wang, Long Su
• Keywords: Deep Stability, Finite Element, Gravity Dam, Method of Overloading

References

[1] DING Ze-lin, ZHANG Lin, CHEN Yuan, HU Cheng-qiu, 3D geo-mechanical model failure test on stability against deep sliding of gravity dam. [J], Journal of Hydraulic Engineering, 2011, 42(4): 499-504.

[2] MA Gang, CHANG Xiao-lin, ZHOU Wei, ZHOU Chuang-bing, Deep anti-sliding stability analysis of gravity dam based on Cosserat continuum theory, [J], Rock and Soil Mechanics, 2012, 33(5): 1505-1512.

[3] CHANG Xiao-lin, WANG Hui, ZHOU Wei, ZHOU Chuang-bing, Mechanism of two sliding failure modes in gravity dam and method for safety evaluation, [J], Journal of Hydraulic Engineering, 2009, 40(10): 1189-1195.

[4] SUN Jian-sheng, HOU Ai-min, The calculation method for stability against deep sliding with three sliding planes under the same reliability-surplus of gravity dam based on partial factor, [J], Journal of Hydraulic Engineering, 2013, 44（3): 367-372.

[5] SONG Dong-fang, LIN Hao-yu, SU Tao, CHEN Hai-long, ZHANG Jian-hai, Research on stability of Ganhaizi landslide based on fuzzy information optimization, [J], Yangtze River, 2012, 43(1): 9-11.

[6] SU Pei-fang, Study on stability evaluation method for RCC gravity dam, [J], Yangtze River, 2012, 43(2): 78-82.

[7] GE Xiu-run, REN Jian-xi, LI Chun guang, ZHENG Hong, 3D-FEM analysis of deep sliding stability of 3#dam foundation of left power house of the Three Gorges Project, [J], Chinese Jounal of Geotechnical Engineering, 2003, 25(4): 389-394.

[8] ZHENG Dong-jian, LEI Ting, Instability criteria for high arch dams using catastrophe theory, [J], Chinese Journal of Geotechnical Engineering, 2011, 33(1): 23–27.