Analysis Of Piles-rock Interaction For Stabilizing Pile In The Slope

Landslide is a common geological disaster in Three Gorges Reservoir Area,there are many methods to treatment landslide.Anti-slide pile is the most common type of retaining structure,it relies on a stable rock offered resistance to resist thrust which the landslide pass to the pile,also known as "passive pile." Because of inaccurately estimating the mechanics and deformation parameters of rocks,unclearly knowing the interaction between anti-slide pile and rocks,resulting in too large displacement of pile top,internal force variation law of pileand rock bearing capacity around pile is far different from the actual.In order to avoid these errors,This paper put forward a reasonable method to estimate the deformation and mechanical parameters of the rock around the pile,Reveal the pile-rock interaction law,it has important significance and engineering guidance value to treatment landslide and rational arrange slide pile in in Three Gorges Reservoir Area.The paper takes standard slope and specific landslide engineering for example,builds a three-dimensional slope model,based on finite element strength reduction,put forward a rock strength and deformation of Socketed rock section estimation method based on site investigation and laboratory tests.Comparing the calculated method of domestic and foreign rock bearing capacity around pile,researching the influence of different geological mechanics classification indexes on the internal force of anti-slide pile and the rock mass resistance around the pile.Analysis of the soil arch effect between anti-slide piles,pile location and rock-socketed depth effect on the stability of the landslide.The main contents and conclusions are as follows:(1)Rock-socketed segment of rock mass strength and deformation parameters estimation Using geomechanical classification,Combining RQD,joint plane Classification and intact rock uniaxial compresive strength to define GSI.Using HoekBrown strength criterion to define weathered rock strength and deformation parameters which applied to three dimensional numerical modeling and pile-rock Interaction analysis.(2)Calculation method of lateral bearing capacity of rock-socketed in rock compared the "specification method" and Hoek-Brown failure criterion about rocklateral allowable bearing capacity calculation.applying Hoek-Brown failure criterion concluded the relationship between same GSI lateral allowable bearing capacity of rock mass and with the depth of rock-socketed changes,variation of rock lateral allowable bearing capacity in different GSI.(3)Three-dimensional numerical analysis of pile-rock interaction Using finite element analysis,obtained in different GSI the change law of internal force of the pile,pile top displacement and rock-socketed segment resistance(4)Anti-slide pile reinforce the slope stability analysis,build three-dimensional slope model,analysis of soil arching in different pile spacing,discuss pile spacing,the optimal pile position and rock-socketed depth influence on slope stability,the optimum design Anti-slide pile is put forward.(5)Analysis of engineering case According to rock surrounding anti-slide piles RQD statistics,uniaxial compressive strength of intact rock and site for the observation of the rock mass structure and weathered degree of discontinuous surface,define GSI,according to Hoek-browm criteria,estimate E?c ?? and lateral allowable bearing capacity.Put these parameters into the finite element analysis model,analysis of deformation and plastic zone distribution change law of slope stability before and after slope reinforced with piles.Mutual verification between numerical simulation and practical monitoring.