Theoretical Analysis Model For Block Crack Rockmass Slope Stability And Its Application

As economic develops rapidly, the construction of railway and highway becomes faster. There are many artificial slopes along railway and highway, and many slope sliding problems appear. Slope slides are divided into earth slide and rock slide. Many people have studied much about earth sliding slope. Compared to earth slope ,rock slope has its features. The study of stability analysis of Block crack rockmass is always a complicated and concentrated problem. On the base of geology ? survey ,combining newly present Block Theory with Fractal Geometry, Grey Theory, Random Simulation Theory and Numerical Method ,the Author builds theoretical model of stability analysis of Block Crack rockmass.,and applies it in ? stability analyzing of rockmass slope in k300-k3 16 Xiang--Qian Railway. The aim of the Author抯 is to solve stability analyzing problem of Block Crack rockmass in slope. The content of this Thesis contains: 1. Combinating vector analyzing method with equator plane projection of rockmass structure plane in whole space ,the Author determines the limited and unlimited blocks among the blocks that made up of by many joints and cracks in slope, and looks for the potential sliding blocks. According to different sliding planes, the Author puts up forward different calculation formulae of blocks stabilities. 2. On the base of Fractal Geometry ,the Author has studied the features of joints and cracks(Locality, Shape, Scale, Distance or Density, Roughness, plane Strength etc.),and determines mechanics parameters of joints and cracks in rockmass. 3.On the base of studying result of JRC, The Author modifies the calculation formula of mechanics expanding width in joints and cracks i.e JRC a- bm = (0.2 梥-- ?0.1) .When under the condition of perpendicular force ,the 5 JCS calculation formula of expanding width in joints and cracks becomes a b,,, = bm exp(??) . Under the normal force, the fluid in joints and cracks is very km bm sensitive to expanding width of joints and cracks. The connection between force grad and expanding width through joints and cracks is inferred. 4. It is the first time that the Author regards the Length ofjoints and cracks as limited. On the base of probabilistic and statistics results of joints and cracks, the Author modifies Block Theory. The sliding probability of Key Block is I A RSTR A CT F2 (x) ? 5.It is put up forward that GM(l,1) Model to predict Amount of rainfall, and Markov Chain to modifY GM( 1,1 )predicting result, and then a theoretical predicting Model of amount of rainfall is firstly built. This model is applied in a situ example. It is proved that the model is very useful to predict amount of rainfall ,when ordinal array of Amount of rainfall changes in unexact index rule. 6.Finite Element Method is applied in analyzing stability in Block Crack rockmass slope, during the analyzing, joints , cracks, and nonlinear feature are considered. 7.The theoretical analyzing model is applied in analyzing stability of rockmass slope in k300-k3l6 Xiang--Qian Railway, on the base of analyzing results, instructive proposal to engineerin...