Abstract
Researches on the energy evolution of the key blocks is helpful to reveal the failure process of locked-segment type slope, whose stability is governed by the locked segment along the potential slip surface. In order to study the failure mechanism of the locked segment in the process of slope progressive failure due to strength attenuation, a series of stability analysis on the numerical models of locked-segment type slope were implemented to record the relationship curve between energy and strength reduction coefficient. Then, according to the variation law and characteristic of energy evolution, the failure process of the locked segment was divided into four stages: elastic stage, initial damage stage, extensive damage stage and failure stage. And the reduction coefficient corresponding to the peak of the energy evolution curve was employed to achieve landslide warning. In addition, the method to determine the safety factor of locked-segment type slope was given, and its reliability was verified by comparing with other traditional methods. Finally, the formula for calculating the initial sliding velocity was presented based on the residual strain energy which is defined as the elastic strain energy of the locked segment when the slope is unstable.
Highlights
Locked-segment type slope generally refers to the large rock slope controlled by one or more key blocks and containing huge potential energy
Where, Ug is the increment of gravitational potential energy, Ue is the increment of elastic strain energy, Ud is the increment of plastic dissipative energy, and Uk is the increment of kinetic energy of the slope body
This paper proposes the residual strain energy, which is defined as the elastic strain energy before a sudden drop in energy occurs, and the initial sliding velocity can be calculated by the following formula: vini
Summary
Locked-segment type slope generally refers to the large rock slope controlled by one or more key blocks and containing huge potential energy. It is characterized by high-speed sliding after its failure, sometimes accompanied by luminescence and heating. The locked segment is the key block controlling the stability of slope(Chen et al 2017, Gehle and Kutter 2003), and can be regarded as a geological structure with high strength and stress concentration existing in the potential sliding surface (Chen et al 2019, Zhang et al 2020, Zhao et al 2019). The research results of this paper have good theoretical significance and application value in the early warning of failure, stability evaluation and reinforcement treatment of such slope
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