Research On Motion Features And Disaster Prevention For Rockfall Disaster Of Highway Slope

Rockfall disaster is one of the major geological disasters in mountainous areas, due to the multiple, unpredictable and random nature of the characteristics, it often results in serious damages. Along with the construction of highway in mountain area, rockfall disaster becoming increasingly serious; However, it is a lack of evaluation methods on the rockfall motion characteristics and research on disaster-preventive measures. In this paper, base on the investigation and hazard prevention practice of rockfall disaster in southeastern FuJian Province, the research and analysis of the rockfall hazard mechanism, model test about trajectory and impact behavior of rockfall, numerical simulation, disaster prevention and control technology were carried out.The formation mechanism of disaster, motion laws of rockfall, simulation method, disaster prevention were summarized.The main conclusion of this thesis are summarized as follows:1、The rockfall hazard triggers that causes the rolling stones start moving, including the rainfall, power function, excavation disturbance were summarized. The startup mode, movement and disasters manifestation were analyzed. The rockfall hazard characteristics were summarized. Factors that affect the movement of rolling rock, including the launch mode, trigger conditions, slope conditions, blocks conditions and protective measures were discussed.2、The model test of rockfall was carried out. The movement and motion track of the rockfall in the test were analyzed. The offset features of rock movement and the stagnation of platform for the the rolling stones were discussed in different conditions including the terrain of slope, the shapes of rockfall and the covers of slope. The characteristics of the motion track of rockfall in different conditions including the shapes of rockfall and the slope condition were summarized.3、The numerical simulation of rockfall was carried out. According to the characteristic of trajectory and the changes of velocity and energy, the damping factor was identified as the most sensitive parameter. Based on the fitting trajectory between the numerical simulation and the model test, the numerical simulation parameters were determined. It was concluded that there is a high consistency between the simulation of Particle Flow Code and simulation of RocFall, the applicability of the two sets of simulation tools is affirmed, and the reliability of model tests is verified. According to the high consistency between the simulation of Particle Flow Code and simulation of RocFall under the suitable conditions, it was concluded that it is an important method to evaluate the movement rockfall by using the Particle Flow Code and RocFall.4、Based on the research of rockfall movement theory, experimental simulation, and numerical simulation, the factors of rockfall were analyzed, the strategies of rockfall disaster protection were proposed which include the design of slope ratio and platform, the evaluation of rockfall movement, the design of cover conditions and the design of blocking protection. Based on a typical rockfall disaster project, the geological investigation and simulation of rockfall were carried, and a detailed disaster prevention was proposed.