Study on the Mechanical Cumulative Damage Model of Slope Fault Fracture Zone under the Cumulative Effect of Blasting Vibration

Authors

  • Tingyao Wu
    Affiliation

    Department of Civil engineering, Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

  • Zhou Chuanbo
    Affiliation

    Department of Civil engineering, Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

  • Jiang Nan
    Affiliation

    Department of Civil engineering, Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

  • Xia Yuqing
    Affiliation

    Department of Civil engineering, Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

  • Bin Zhu
    Affiliation

    Department of Civil engineering, Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

https://doi.org/10.3311/PPci.16030

Abstract

As for the slope with fault fracture zone, the fault fracture zone is the main sliding surface, whose shear strength parameter is the main calculation parameter of landslide occurrence. In this paper, shaking table model tests and damage theory were used to study the change of shear strength and mechanical cumulative damage model of fault fracture zone under the blasting vibration cyclic load. At first, the slope of Daye Iron Mine is selected as a case to study the shear strength weakening law of fault fracture zone by the similarity theory and the principle of the orthogonal test, in which the influence of the characteristics of vibration loading on the shear strength parameters of fault fracture zone with different thicknesses was studied. Secondly, by the assumption of Lemaitre strain equivalence and according to the extreme value characteristics of the normal stress-shear stress curve, the damage theory model of the fault fracture zone was reconstructed, and the microelement of fault was selected for analysis and divided into two parts, including damaged and undamaged materials. Finally, the results of the shaking table model tests were compared with the results of the shear cumulative damage model to verify the rationality of the theoretical model. Moreover, the predicted results of the theoretical model can better reflect the degradation trend of the fault fracture zone with the loading amplitude, normal stress, and loading times. It can be used as a reference for slope stability prediction under the action of cumulative static and dynamic loads.

Keywords:

blasting vibration, cyclic load, fault fracture zone, cumulative damage model

Published Online

2020-06-12

How to Cite

Wu, T., Chuanbo, Z., Nan, J., Yuqing, X., Zhu, B. “Study on the Mechanical Cumulative Damage Model of Slope Fault Fracture Zone under the Cumulative Effect of Blasting Vibration”, Periodica Polytechnica Civil Engineering, 64(3), pp. 845–858, 2020. https://doi.org/10.3311/PPci.16030

Issue

Section

Research Article