Informatics Publishing Limited

Chen Xiaoxue ¹, Xu Peihua ¹, Zhang Wen ¹, Wang Fei ¹

Affiliations
1 College of Construction Engineering, Jilin University, Changchun-130026, CN

Abstract

Based on the water conservancy and hydropower projects of the red rock barrier lake in Ludian County, Yunnan Province, this paper describes the simulation of a B1 rock slope model using the discrete element to test the earthquake damage process, the fracture extension process and the stability of rock slopes. This paper also introduced the modeling process, calibration sequence of a micro structure parameter, the determination of uniaxial-biaxial loading rate of numerical tests and seismic loading method. In order to evaluate the stability of slope under nature and seismic state, the convergence of the time-displacement history curve is regarded as the standard of whether the slope is stable. The results of the trial indicated that earthquakes affect the initiation, acceleration, and progression of rock slope failures. The destruction of rock slopes was mainly attributed to tension and shear, so the parameters of shear strength of slope rock mass materials determined the stability of the deformation. Given the stress concentration along the weak rock stratum, a fracture easily formed and expanded into the plastic penetration area from the top surface of the rock slope.

Keywords

Rocky Slope, Earthquake, Fracture Extension, PFC2D Numerical Simulation.

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Chen Donghui ¹, Xu Peihua ¹, Zhang Wen ¹, Chen Jianping ¹, Song Shengyuan ¹, Wang Yindong ²

Affiliations
1 College of Construction Engineering, Jilin University, Changchun-130026, CN
2 Jilin Team of Geological Survey Center of China Building Materials Industry, Changchun-130026, CN

Abstract

The evaluation of landslide hazard degree is a complicated conversion problem between qualitative and quantitative because the influence factors are uncertainty, randomness and fuzziness. The Xulong reservoir area located at the upper reaches of the Jinsha River is selected as a case. The nine impact factors are chosen from the geological conditions, landslide characteristics and hazard inducing factors aspects and the evaluation system is established according to the selected factors. Furthermore, weight coefficient of each factor is determined by the analytic hierarchy process. The normal cloud model is used to calculate the cloud characteristics of each index in the classification standard of landslide hazard degree, which generates the normal cloud droplets. The method not only achieves the uncertainty mapping between landslide hazard grade and evaluation index, but also considers the randomness and fuzziness of index. The analysis results of the case show that the proposed method provides better accuracy and reliability and is convenient to be applied to the practical engineering.

Keywords

Landslide, Hazard, Cloud Model, Certainty Degree, Analytic Hierarchy Process.

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