The Study About Factors Analysis And Research Of Anchor Foundation Pit Supporting

Bolt in excavation are applied more widely, because of its simple construction, siteadaptability, strong seismic capacity, large single anchor load capacity, good stability.However, due to the complexity of the construction site and geological conditions ofuncertainty surrounding environment, accidents have occurred Foundation. Pit accidentoccurred mainly due to improper design and construction, so the studying of anchorexcavation factors have important significance in the present study engineering projectanchoring technology.This treatise introduces the development status bolting technology, design principlesbolting, and some of the theoretical basis of the finite element model, and basic researchfoundation pit anchor on the factors put forward their own research methods and ideas.The use of finite element analysis software ANSYS anchor pile excavation dimensionalmodel, using linear elastic-plastic Drucker-Prager yield criterion to study the bolt length, boltinclination, prestressed bolt, bolt where the performance parameters of the soil and othereffects on anchor excavation, the numerical simulation of the resulting data were analyzed,discussed and summarized the influence of these factors.Studies have shown that: First, when the excavation carried out using anchor, anchorinclination should adopt20°, this time the smallest bolt to withstand the loads, and supportingthe best. Second, the bolt length increases, can play a positive role in the stability of the pit,but the bigger the bolt length, the length of exposure to anchor the unit load is reduced, is notconducive to take full advantage of the material, and therefore on bolt length should beconsidered when designing anchor material utilization in ensuring the stability of theexcavation safety. Third, anchor prestressing is applied to reduce the amount of deformationcan make pit, but with the gradual increase of prestressing influence gradually decreased.Fourth, the soil deformation modulus of the bolt where the soil shear strength increases, theexcavation of the bolt has a positive effect, can effectively reduce the pit deformation, therole of soil shear strength to than large deformation modulus role. Fifth, the multi-row anchorfor Foundation Pit, the upper anchor bolt axial force is greater than the lower row of axial force, and therefore in the design, the upper anchor bolt length should be greater than thelength of the bottom row.