Analysis On The Extent And Influencing Factors Of Typical Dangerous Rock Collapse

Methods of the traditional field survey method in the years of geotechnical engineering investigation play an indispensable role in the engineering, compass production shape measurement, measured in rock mass size, block classification, GPS positioning, mainly through t he scene investigators field visits and completed the study, its characteristics lies in the survey method is convenient, the survey accuracy high, to investigate the usefulness of strong, and in the past engineering survey work is the use of a large number of. But with the development of engineering construction, high steep slope stability and rock along the mountain highway and the railway survey statistics, forecasted more, for the engineering geological conditions of more and more complex, and the disadvantages of traditional methods more obvious and was unable to complete the measurement task. Three dimensional laser technology is known as the second technology revolution in surveying and mapping since the GPS technology ". As to obtain an effective means of spatial data, 3D laser scanning technology to the rapid, accurate and non-contact etc. in various fields play an important role, especially in the high and steep slope rock mass survey, to make up for some shortcomings of the traditional method, the three-dimensional geological model is established, facilitates intuitive understanding to solve the high and steep slope area data acquisition problems.The field difference and 3D laser modeling interpretation method and the synthetical analysis of the ridge collapse of dangerous rock mass deformation signs, joint development and accumulation of accumulation characteristics(according to the size of the block, lithology, shape classification. In the full understanding of the ridge area of rockfall geologic al environment based on, the division of dangerous rock collapse type, the analysis of ridge rockfall stop product of the different factors of the distance. Select Rockfall as numerical calculation software, under the premise of known dangerous rock body has the greatest impact on the scope, using the method of inverse analysis, through repeated coupling calculation and get Rockfall parameter values, select parameter values to predict the Ling landslide and get its greatest impact scope, thus delimits the safety area, divided into the area of human activities.The work done in this paper consists of the following points:(1) the 3D modeling of the whole collapse zone. For a massive point cloud data, to take on each site cloud denoising, overall and grid filtration method to the data thinning processing, and then select the appropriate plane model. Reached to each station data modeling, and select invert target as registration certificate, through the field measured inverted coordinate input to achieve the overall three-dimensional model of stitching;(2) dividing the collapse area according to the particle and the lithology of the collapse accumulation characteristics of the collapse accumulation. Combined with the results of field investigation and three-dimensional geological model of the visual effects, to distinguish the collapse is 5, and the use of poly works large-scale integrated software on each collapse accumulation of body detailed interpretation, so as to understand the accumulation in the body of the rock block accumulation characteristics;(3) statistical characteristics of rock structural plane. By comparing the photographs of the scene, each a collapsing region of the 3D model into poly works large-scale integrated software, respectively, the dangerous rock mass structural plane occurrence, spacing, aperture parameters such as statistics;(4) analysis of unstable rock collapse process of moving distance factors by using Rockfall software. In Rockfall Software Assurance other parameters fixed conditions, change one of the parameters and perform a sensitivity analysis on the main factors that influence the movement of rock body.(5) by using the method of inverse analysis of parameters, the prediction will happen again rockfall far distance movement. The final calculation combined with field investigation and measured the total stay in position, as the parameters of the Rockfall anti analysis reference in the Rockfall software in the repeated input parameters the collapse process of numerical calculat ion until the actual coupling so far. Finally, it is concluded that Rockfall parameters. Back analysis of parameters of the substitution of each slope, and field actual measurement data combined using the maximum collapse of dangerous rock mass quality, in a given development after the steep cliff Yan a prerequisite for a certain level of velocity of the dangerous rock, prediction of dangerous rock mass in the greatest impact range.