Experimental Study Of Rolling Stone Motion Based On Stereo Vision Monitoring With Binocular High-speed Camera

Our country is one of the countries in the world with the largest number of people threatened by disasters and the most serious loss of economic property.The disasters are widely distributed,sudden,hidden and destructive,and there are many kinds at the same time,such as collapse,rolling stone,landslide,debris flow and so on.Among them,rolling stone is one of the most common mountain disasters as a shallow destruction method on high and steep slopes.Rolling stone failure forms are complex and diverse,has been the focus and difficulty of slope engineering treatment.How to reduce the damage of transportation facilities caused by rolling stone disaster and the threat to the safety of people's lives and property is the task and goal of researchers.In this paper,three aspects of field test,confirmatory test and numerical calculation are carried out to analyze the motion characteristics of slope rolling stone.The main elements and conclusions are:(1)A rolling stone motion test device has been developed,and a rolling stone motion monitoring system has been established using binocular high speed camera,Rocke TECH calculation system,three-dimensional spatial coordinate system,rolling stone automatic release device,etc.The system can automatically identify the rolling stone motion and calculate the rolling stone motion velocity,acceleration,displacement and other related physical quantities.(2)The field test of rolling stone reduces the number of field experiments by orthogonal test method.Considering the different slope angles and the different starting and falling height,shape and quality of rolling stone,the experimental monitoring results of 9 different working conditions of a slope along the G318 National Road of Tibet Plateau are analyzed,and the evolution relation of the rolling stone motion parameters with time is obtained.(3)By analyzing the extreme difference of velocity,the influence of rolling stone's own characteristics and slope condition on rolling stone's motion is obtained.In the process of rolling stone,the velocity is generally large and accompanied by obvious lateral rotation,and the trajectory of rolling stone shows three-dimensional motion characteristics.Among them,the most influential factors on rolling stone movement are slope angle,followed by rolling stone quality,shape,height and other rolling stone characteristics.(4)The statistical measurement of the speed measured by the on-site rolling stone motion test is carried out,and the empirical regression equation is obtained:Y is the velocity index,the slope is the slope slope,x2 is the starting height,x3 is the rock mass shape,and x4 is the rock shape.Block quality.(5)Using empirical regression formula and RocFall calculation to analyze the dangerous rock mass in Taji Village,Dazi County,Lhasa,the failure trajectory and rolling velocity of the dangerous rock mass are obtained,which provides the basis for guiding and protecting the dangerous rock mass.