Research On The Effect Of Slope Shape In 2-Dimension For Anti-dumping Layered Rock Slope Deformation

Slope effect is an objective reality, generalized slope effects include different forms of different cross-sectional shape and a longitudinal section, that is the three-dimensional shape of the slope effect. Due to the current theory and technology of three-dimensional slope effect is imperfect, the slope effect study of cross-section is more than the study of longitudinal section.So this article will study on the slope effect from the longitudinal section of the slope.The articelmainly study from the case statistics, theoretical analysis, numerical simulation, experimental research and engineering applications. The main achievements made in the following aspects:(1) The slope are separete into the following four categories : linear slope, concavev slope,convex slopeand stepped slope. The relationship between the slope and the layer direction is: linear slope: 0 90°; concave slope: 0°180°; convex slope: 0° 180°.(2) Detailed statistics for 13 different forms of slopedeformation and their failure characteristics, the results showed that: the deformation and failure modes of different shape of slope relative with ther reslut of layer angle plus slope angle. Linear slope toppling deformation main slope starting at the shoulder area, prone to dumping to crack, and continue develop deeply. Concave slope toppling deformation occurs mainly in the upstair of the slope and the mainly deformation is rockfall.The dumping deformation area concentrated in the shallow of the slope.Convex slope toppling focused on protruding parts, and it can produce creep dumping, dumping avalanches and so on; Stepped slope produce stress concentration in bumps site easyly,and may produce dumped creep, multi-level slide.(3)Having analysis of Aydan and Adhikary's anti-dumping calculation method of slope stability and fracture surface defining method(which assumes that the force of the interlayer is concentration force), derived rock layer crack formula and progressive bent empirical formula by consider the inter-layer forces for the distribution force. By way of example calculation analysis, the slope of different anti-dumping partition boundaries and calculate the number of iterations is substantially the value relationship.(4) Application of the above theory analised the stability of linear slope, concave slope and convex slope, the results shows that: if the reslut of strata inclination angle plus the slopeless than 90 °, the rock is difficult to form a cantilever state, slope in a steady state.but it can be formed dumping cantilever state while the value greater than 90°,and toppling deformation can occur, and the lager the value, the longer the length of the cantile beam, the more prone to toppling deformation. According to the bending plane by multiple iterations reslut andcombined Aydan and Adhikari dumping calculation plane,the dumping depth partition distric boundaries of different shape of slope were analyzed.(5) Using the UDEC simulate four categories slope form,by combination of different strata inclination angle and slope angle established 36 model, analised the deformation mode and deformation characteristics of various shape of slope.According to the vairous position of the gradient chaged point of concave slope and convex slope, establishing six discrete element model to compare the deformation and destruction of the slope.(6)According to four different types of slope morphology and defferent height of the gradient changed point of concave slope and convex slope established 18 model by FLAC software and analised the distrubution characteristics of the slope stress.(7)Through the base friction test to verify the analysis some typical deformation which is simulating in UDEC software.The result showes that: when the slope angle and inclination anle of the layer is precipitous in linear slope, it can occur deeply toppling and the breakarea ismultistage break. Concave slope toppling mainly occur in the upstair of the slope, and the break area angle is similar to the slope angle.Convex slope prone to large-scale dumping deformation while the slope angle of upstair and downstair both steply.(8) In order to verify the correctness of the conclusions of this paper, the above calculation and analysis applied to the slope of upper reaches of the Yellow River and the slope of a hydropower station slope in Miaowei Reservoir area, and achieved good results.