The 3D Geomechanical Model Test For Combined Anti-slide Pile

China is a mountainous country,with the vigorous development and construction in southwest China,more and more economic activities done in the mountains and involves a lot of predominantly landslide geological hazards problems,anti-slide pile is increasingly plays an important role.Now,the geological disasters such as landslide problems tend to be large and complex,common anti-slide pile is difficult to meet the requirements of landslide.In order to governance landslide better,new combined anti-slide pile concept is put forward.Compared with common anti-slide pile,combined anti-slide pile has more superior support performance,h anti-slide pile has been applied to engineering practice,practice shows that it has good supporting effect,can effectively overcome the shortcomings of common anti-slide pile.So far,new combined anti-slide pile to mechanical characteristics and design theory research also is not very perfect,the anti-sliding mechanism of the new type of combined anti-slide pile research needs more and more attention.Represented by h anti-slide pile and portal double row anti-slide piles,The structure calculation methods of the combined piles and soil are summarized.To analyze the mechanical characteristics of combined anti-slide pile and its engineering application value.Three dimensional geo mechanical model test platform are established to monitor the strain of pile,displacement of pile top and soil pressure in all directions.Master stress and strain state of the combined anti-slide pile under the landslide thrust,and analyze the test data.Reveals the mechanism of the pressure distribution of anti-slide piles,pile body displacement,internal force of pile with the landslide thrust increase.Found the "covered" effect between anti-slide pile front row,namely under the low landslide thrust,back row pile to undertake the bulk of the thrust load.Using flac3d to simulate retaining effect of combined anti-slide and analyze combined anti-slide pile soil interaction effect,combined anti-slide pile internal force distribution is concluded,and compares with three dimensional geomechanics model test results,a relatively complete reveals the combined mechanical characteristics and working mechanism of the anti-slide pile.In the practical engineering application,and through the technical and economical comparison analysis of large cross-section piles and h anti-slide pile,provide theoretical basis for the application of combined anti-slide pile.