The Research Of Micropiles' Designment And Method Based On Emergency Treatment Of Slope

The micro pile has the advantages of easy construction,flexible and convenient,small site disturbance,and its own stiffness to meet the needs of the emergency reinforcement of the slope.On the foundation of analysis of the mechanism of micro pile reinforced slope,by the method of analysing theory,modeling numerical simulation and so on.The systematic and deep research have been done on how to determine the pile spacing when the slope is reinforced by micro piles is studied.The results of this paper are as follows:(1)Combined with the research status at home and abroad about micro pile,using finite element numerical simulation software FLAC3 D is established on the micro pile reinforced slope model,the numerical simulation and analysis of,taking the analysis of the soil arch effect in the micro pile in variation,studing on soil arching effect formation mechanism.It is concluded that the influence of pile spacing on soil arch effect is greatest.(2)By the analysis of the formation mechanism of the micro pile and soil arch between piles spacing,concluding the calculation method of reasonable pile spacing of micro pile.Combinded with control conditions for the formation of soil arch,The calculating formula of the reasonable pile spacing of micro piles is deduced.(3)In the micro pile reinforcement layout of the slope,reinforcement mechanism and the stress distribution and failure modes were discussed based on the in-depth analysis of the,based on elastic foundation coefficient method of p-y curve method.And at the same time,considering the influence of axial force are derived from the micro pile reinforcement of slope calculation internal force and displacement of the finite difference formula.(4)Proposing the method of pile position selection,calculation of anti slide force,pile length and pile spacing,and the design method of micro pile reinforcement slope.