Three-Dimensional Geological Modeling Of TianXinShi Residue Soil Field And The Stability Analysis Under The Effect Of Three-Dimensional Space

Many cities have encountered contradictions between people and land and traffic congestion in the rapid process of urbanization in our country.In order to solve these issues,these cities prompt to upgrade their trunk lines.And generating a large amount of muck in the construction process.It can easily cause many security accident.For instance,the disaster landslide of Shen Zhen Guang Ming New District Residue Soil Field which covered an area of about 380000 square meters,and the content of this landslide reached almost 250000 cubic meters.What's more,about 33 buildings were buried and 91 people missed in this accident.The further study about instability problem of Residue Soil Field slope has become the key problems which need to be solved at present.Generally speaking,the two-dimensional stability evaluation is mainly adopted for the stability evaluation of the muck.The specific evaluation process is to select the typical two-dimensional geological section on the basis of finding out the geological body of the waste soil field,and use the two-dimensional limit equilibrium method to evaluate the stability.However,in the actual engineering practice,the muck is usually stacked in the site with undulating terrain,which generally has a certain "closing" effect,which makes the residue field have a very typical three-dimensional characteristics.The traditional two-dimensional analysis often underestimates the slope stability of the slope,which will lead to the design parameters of the treatment project too large.In order to prompt the above-mentioned problems solved,the Tian Xin Residue Soil Field was chose as an example.By strength reduction method and three-dimensional limit balance method,the stability of slope in the effect of three dimensional was studied.The main work and expected results are as follows.(1)Investigate the basic engineering geological conditions of Tianxin quarry.Understand the topography,lithology,geological structure and hydrogeology of the study area.The basic concept is established for the stability analysis.(2)Based on Kriging interpolation method,using C++ language,VTK graphics library,gstl(the geostatistics Template Library),opencv and opencv?viz,the program of three-dimensional geological model of slope is constructed,and the refined threedimensional geological model of typical slope is established,which provides a reliable premise for improving the analysis of three-dimensional effect.The process of establishing 3D geological model is as follows:obtaining terrain data?building surface?analyzing borehole data?generating stratum model?model assembly.Based on the above method,a 3D geological model of the south side slope of Tianxin is established.(3)Based on the strength reduction method,the deformation of slope under twodimensional and three-dimensional conditions is compared and analyzed,and the threedimensional effect of slope stability evaluation is obtained.The effect of the slope is shown as follows1.There are differences in the deformation value and deformation region in the twodimensional case,the deformation is concentrated in the top of slope,while in the threedimensional case,the deformation is concentrated in the middle;2.There are differences in the shape and position of the slip surface reflected by the maximum shear strain increment: in two dimensions,the slip surface is cylindrical,and in three dimensions,the slip surface is near the edge and is in a drawing arc;3There are differences in quantitative results of slope stability:3D is better than 2D.(4)Based on the two-dimensional Spencer method,combined with the engineering geological characteristics of the slope,the Spencer calculation theory under the condition of three-dimensional model is derived,and design the program,development of the three-dimensional limit equilibrium method are carried out,and the search method of the most dangerous sliding surface in the slag field is constructed.The stability of the slope was evaluated by using the program of three-dimensional slope stability evaluation.(5)Comparing and analyzing the stability of two-dimensional and three-dimensional conditions,the two-dimensional stability coefficient is more safety.The reason is that in two-dimensional case,the slope is assumed to have no lateral constraints,while in the three-dimensional case,each micro soil mass is not only subject to the constraints in the aspect parallel to the slope direction and in the vertical direction,but also affected by the rock and soil mass in the direction perpendicular to the slope direction.The threedimensional spatial effect of the slope is revealed.