Model test and numerical simulation of deformation influencing factors of recoverable pile anchor
In this work,the effects of anchor recovery on foundation pit deformation during excavation and backfilling were explored based on the model test of foundation pit supported by recoverable pile and anchor and MIDAS GTS NX finite element software.By changing the parameters such as anchor angle,vertical spacing,pile length,and pile spacing,the variation laws of horizontal dis-placement,surface settlement,and bending moment of pile body were revealed.The results show that the supporting effect of the recoverable pile-anchor supporting structure is the same as that of the traditional pile-anchor supporting structure,the surface settle-ment curve is groove-shaped,and the horizontal displacement of the supporting structure extends into the pit in the form of arc.In the backfill stage,the failure recovery of anchor is the main factor causing the displacement growth of supporting structure,and the influence of upper anchor is the most prominent.In the foundation pit supported by recoverable piles and anchors,the vertical spac-ing of recoverable anchors is 6D,and the supporting effect is ideal when the angle lies in the range of 10°-30°.The deformation of foundation pit can also be controlled by appropriately increasing the pile length and the number of anchor layers.
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