| The semi slope pile which is discussed in this paper is a kind of anti slope pile,which is set in the half of slope.Traditionally the anti slope pile is set in the foot of the hill,as we call it the foot-slope pile.The anchorage zone of A foot slope pile is semi infinite space,while the anchorage zone of A semi slope pile is semi triangular space.Generally the concept of Elastic foundation beam and the experiment of horizontal resistance coefficient are based on semi infinite space.The research of Elastic foundation beam,which is anchored in semi triangular space,is few.The same as the theory of plan and calculation is few either.As the plan of The Great Western Development is carried out,so many projects is in mountain region and hilly region.We could find a lot of side slope,for example the side slope of highway engineering,the side slope of railway engineering,the side slope of construction engineering and the side slope of municipal engineering.The plans for controlling these slopes do not use the foot slope piles,while use the semi slope piles for the reasons of topographic features and geological conditions.So a great deal of semi slopes are used for controlling.Through some examples is given in this paper,the finite element simulation method is adopted.The focus of this paper is the depth of the effective anchor line,by the way of searching the plastic zone and high pressure stress bubble in zone,which is under the slip surface.The research method,by the length of piles as a variable,is based on the analysis of pile soil interaction model,under different circumstances.The concept of the effective anchor line is proposed.This paper is based on the hypothesis: that the region which on the effective anchor line could not provide the same horizontal resistance as semi infinite space,while the region which under the effective anchor line could provide the same horizontal resistance as semi infinite space.Meanwhile,setting of the pile position,selection of the pile type and reasonable value of the pile spacing are summed up in this paper.This paper obtains the following conclusion.①By collecting data,sum up the reason why engineers choice the semi slope piles to controlling slopes.According to different geological conditions,analyze different failure modes,and propose different calculation method.②Create many finite element models,and analyze the stress distribution state of the rock in anchorage zone.By the way of changing the length of the pile,distinguish the effective anchorage zone and the invalid anchorage zone,obtain the effective anchor line.③According to the different types of piles,analyze the conditions which meet the effective anchor line,and research the geometry relation of the effective anchor line and the height of pile section,compare with engineering experience. |
