Study On The Optimization Of The Slope Support Of A Filled Double-row Piles + Anchor Cable

With the continuous development of our economy and the need of urban infrastructure construction,the requirements for engineering technology and quality are getting higher and higher.In order to satisfy people’s yearning for a better life,slope engineering puts forward higher requirements for support structure.On the basis of double-row piles,this paper studies rigid-framed double-row piles with better integrity,studies the force characteristics and deformation of rigid-framed double-row piles +anchor cables by single-factor analysis method,and the research content includes the deformation,internal force and influence on slope-top structures under conditions of pre-stress of anchor cables,section size of truss,layout form of truss,etc.At the same time,the simulated settlement results are compared with the theoretical calculation results.Draw the following conclusions:（1）Midas GTS NX numerical simulation is used to study the internal force,deformation,settlement and horizontal displacement of the double-row pile structure and the double-row truss pile structure.The results show that the double-row truss pile has better integrity,and the internal force is distributed through self-adjustment.Later,the internal force shared by the front row of piles is significantly increased,and the gap between the maximum negative bending moment of the front and rear rows of piles is small,which is conducive to design and construction.Back row piles 0～8m can appropriately reduce the section size of the pile body or the arrangement of longitudinal steel bars,and there is a reverse bending point 5.32 m away from the end of the back row piles.It is recommended to shorten the length of the longitudinal steel bars in the design or appropriately reduce the back row piles.The length of the body has achieved economic results.At the same time,compared with the double-row pile + anchor cable support method,the length of the third anchor cable can also be reduced.Compared with cantilever truss double-row piles + anchor cables,the buttress truss double-row piles + anchor cables are more excellent in controlling pile deformation.The difference between the maximum positive and negative bending moments of the front and rear piles of the two support methods is small.Therefore,buttressed truss double-row piles +anchor cable is an effective support method.（2）Under different anchor cable prestress,with the increase of anchor cable prestress,the horizontal displacement of the pile top of the buttressed truss double-row piles shows a decreasing trend.Similarly,the pile displacement is also decreasing,but the pile is horizontal.The magnitude of the displacement reduction is getting smaller and smaller.The maximum positive bending moment of the front row piles gradually decreases,the maximum negative bending moment becomes larger and larger,and the maximum positive and negative bending moments of the rear row piles are both larger and larger,and the increase is larger,indicating that the rear row piles are more sensitive to the anchor cable prestress,And the axial force of the transverse truss at 8m is also increasing.Therefore,it is recommended to increase the anchor cable prestress appropriately while ensuring that the supporting structure meets the conditions of anti-overturning and anti-slip safety.（3）Under the different truss layout forms of the truss double-row piles,the truss double-row piles only horizontally arranged are better than the other two layouts in controlling the horizontal displacement and settlement of the pile body,but the effect is smaller,and the effect is less than 4～ The bending moment of the front piles of the truss double-row piles at 8m is greater than the other two support methods.Similarly,the bending moment of the rear piles is 0～8m,where the transverse truss is subjected to the largest axial force and bending moment.The bending moment of the truss is also increased,and the engineering materials and cost are increased.Therefore,from the actual engineering point of view,the choice of truss double-row piles（A）with only horizontal arrangement is convenient for construction,but from the perspective of internal force and material saving,it is better to choose truss double-row piles（C）.The specific choice depends on engineering technology and Depends on requirements.（4）In the case of different cross-sectional area of the transverse truss,the maximum horizontal displacement of the front and rear rows of piles decreases with the increase of the cross section,while the displacement of the pile top shows an increasing trend,but its effect is not obvious.The maximum negative bending moment of the front row piles keeps increasing,but the maximum negative bending moment of the rear row piles does not change much,indicating that the increase of the transverse truss section has a greater impact on the internal force of the front row piles and is more sensitive.Under the conditions of convenient construction,it is enough to ensure that the cross-sectional area is the same as the cross-section of the truss.（5）In the case of increasing the pile length of the slope top structure,as the pile length increases,the horizontal displacement in the horizontal plane of the slope top is less affected,while the maximum settlement of the slope top is greater,but when the pile length increases by a certain length At the same time,its effect on the maximum settlement of the slope top is getting smaller and smaller,so in order to reduce the project cost,the length of the structure engineering pile should be appropriately increased.