Numerical Analysis Of Micro Pile Reinforcement For Landslide

Nowadays,with the expansion of the range of people's activities,the landslide prevention and control have attracted people's attention,whereas because the engineering geological conditions are more complex,For example,the traditional retaining measures have been difficult to meet the needs of delete one space the landslide,In this case,the landslide governance have begun to pay more attention to the light,small,so the grouting micro pile supporting system came into being.Micro pile is a diameter between 100?300mm at the beginning of the pile,root pile is used under vertical loading,with the continuous improvement of the micro pile reinforcement technology,this situation is slowly changing.But because this is a new technology in practical engineering design experience before use that theory is not perfect,which seriously restrict the development and promotion of micro pile.Especially in southern Shanxi,appeared a large part of destruction of the landslide is expansive soil landslide,this is because of the expansive soil slope soil has very special properties,such as expansion,crack and so on,these characteristics make the failure mechanism of the landslide is very complex,it is very difficult to control.This paper summarizes the previous research results.And on this basis,through the FLAC3D software to the micro pile reinforcement of expansive soil slope were simulated.Firstly,by controlling the influence of water content on the parameters of expansive soil,the swelling property of expansive soil is simulated.Then analyze the mechanism of micro pile reinforced expansive soil landslide,and displacement of different factors the micro pile bending moment,shear force and so on,summarize some regular conclusions for engineering design of micro pile provides a very useful basis.Through the simulation of expansive soil landslide:more easily in the water under the condition of the landslide slope,especially the most vulnerable in these areas should focus on strengthening the landslide governance.After treatment,effectively reduce the displacement of slope sliding surface,sliding body of the plastic zone under control,to landslide reinforcement effect.Then,the pile spacing on the micro pile,pile spacing and anchorage depth,shear,moment and displacement were analyzed to determine the optimal pile spacing pile,row spacing and anchorage depth,which is the best micro pile The pile spacing is 8d?10d,row spacing should be the most suitable for 5d?10d,the optimum range of anchorage depth is L/3.At the end of the micro pile spacing limit state are simulated,the micro pile under the ultimate state mechanism.In this paper,the numerical simulation software FLAC3D is used to study the treatment of expansive soil landslide with micro piles,and the conclusion will provide a theoretical basis for practical engineering.