Non-contact Measurement Of Complex Rock Mass And Multi-scale Study Of Discontinuity Characteristics

Rock mass is often used as the main carrier of high and steep slopes.To fully understand the physical and mechanical properties of rock mass is the key to analyze high and steep slopes.Because the strength of the discontinuity is much smaller and the deformation is much larger than that of the rock,the deformation and failure of the rock mainly depends on its internal discontinuity system.Therefore,to understand and master the characteristics of the discontinuity system is the key to improve the precision of rock mass engineering analysis and determine the success of the project.It is the premise of studying the characteristics of discontinuity system to collect the information of discontinuity accurately and quickly.With the development of science and technology,non-contact measurement method is applied to the acquisition of discontinuity information.In this paper,a non-contact measurement scheme is established according to the actual site of the slope at the mouth of daxi Debris flow gully,the global concept of the macroscopic structure surface is established by using uav,and the random structure surface system of the slope surface is interpreted by digital close-up photogrammetry.Among the geometric features of rock mass discontinuity,the most basic are the position,occurrence and trace length of the discontinuity.In this paper,on the basis of four groups of macroscopic structure facing slope sliding surface of slope advantage group division,then using the position MSS concept to the position of the slope surface integral structure system features a quantitative characterization,use occurrence entropy on slope surface integral structure system characterization,to quantify the occurrence distribution characteristics of the stitch length probabilistic distribution histogram of stitch length characteristics of slope and surface integral structure system for quantitative characterization.The geometric characteristics of the discontinuity system of the slope of Da Xi Debris flow gully are described in detail.In addition,the fracture track length of the slope discontinuity system varies from several centimeters to tens of meters.The acquisition,cognition and function of the discontinuity also vary with the scale.Therefore,it is necessary to study the geometric characteristics of fractures at different scales.In this paper,the structural cracks on the slope surface are divided into eight scales according to trace length,and the cracks in each dominant group and all the cracks on the slope surface are taken as the research objects.Then,the geometric characteristics of slope fractures were analyzed by means of MSS,which was used to characterize the fracture location characteristics,and entropy,equilibrium degree and dominance degree,which were used to characterize the fracture occurrence distribution characteristics.Finally,the geometric features of the fractures at different scales and their variation with the scales are summarized.