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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2020  >  20(2): 55-65
FENG Zhong-ju, ZHU Yan-ming, GAO Xue-chi, LONG Hou-sheng, WANG Fu-chun, ZHAO Rui-xin, WEN Jun-qiang, WANG Gui-jun, WANG Zheng-bin. Safety evaluation model of excavating rock slope based on entropy-grey correlation method[J]. Journal of Traffic and Transportation Engineering, 2020, 20(2): 55-65. doi: 10.19818/j.cnki.1671-1637.2020.02.005
Citation: FENG Zhong-ju, ZHU Yan-ming, GAO Xue-chi, LONG Hou-sheng, WANG Fu-chun, ZHAO Rui-xin, WEN Jun-qiang, WANG Gui-jun, WANG Zheng-bin. Safety evaluation model of excavating rock slope based on entropy-grey correlation method[J]. Journal of Traffic and Transportation Engineering, 2020, 20(2): 55-65. doi: 10.19818/j.cnki.1671-1637.2020.02.005
shu

Safety evaluation model of excavating rock slope based on entropy-grey correlation method

doi: 10.19818/j.cnki.1671-1637.2020.02.005
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Qilu Transportation Development Group, Jinan 250101, Shandong, China

  • 3.

    Ecole TPE, Université de Lyon, Lyon 69000, Rhȏne, France

Funds:

National Key Research and Development Program of China 2018YFC1504800

Special Foundation for Basic Scientific Research of Central Colleges of China 300102218115

More Information
  • Author Bio:

    FENG Zhong-ju(1965-), male, professor, PhD, E-mail: ysf@gl.chd.edu.cn

  • Corresponding author: FENG Zhong-ju(1965-), male, professor, PhD, E-mail: ysf@gl.chd.edu.cn
  • Received Date: 2019-10-18
  • Publish Date: 2020-04-25
    Abstract
  • According to slope stability evaluation system, five evaluation indexes, such as slope rock mass quality score, excavation method adjustment coefficient, height correction coefficient, structural surface adjustment coefficient, and structural surface adjustment value, were selected to reflect the overall stability of slope, and serve as the safety evaluation model sequence variables. The entropy weight-gray correlation safety evaluation model was established. Taking the target slopes as the system characteristic sequence and the 12 rock slopes as the correlation factor sequence, the safety of the typical rock slopes along the reconstruction and expansion project of Beijing-Shanghai Expressway was evaluated, and the engineering advices were provided. FLAC3 D simulation software was used to analyze the stability variation laws of the slopes under different stages of mechanical excavation and static blasting at different blastholes, and the accuracy of the safety evaluation model was verified. Analysis result shows that the evaluation indexes of the slope stability can well reflect the slope stability characteristics. The entropy weight-grey correlation safety evaluation model full plays the advantages of grey correlation method in the analysis of small sample data, and the index weights calculated by entropy weight method improve the defect of the traditional grey correlation analysis that the indexes are weighted by experts or average method, making the evaluation result more objective. The third-grade and first-grade slope excavations reduce the safety factor of the slope K593+260~K593+555 to 1.01 and 1.00, respectively, with decreases of 34.8% and 9.1% respectively compared with the upper grade slope. It shows that the excavation of rock slope with gently inclined bedding slope will cause rock layer slide along structural plane and makes the slope become unstable. Transients dynamic load and load accumulation effect control the stability of the slope under static blasting condition. The occurrence of transients dynamic load reduces the slope safety factor by 7.7%, and the dissipation of the load accumulation effect rises the safety factor by 3.6%. It shows that the blasting has obvious loosening effect on the slope, and the dissipation of load accumulation improves the slope stability.

     

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