Supporting Conditions Within The Bottom Row Pile Soil Effect Analysis And Optimization Research

With accelerating modernization construction in China,Urban high-rise buildingshave sprung up, and construction land increasingly nervous.Foundation pit supportingengineering are more and more restricted by environment factors.The requirement offoundation pit deformation control is becoming more and more strict.Pile bracesupport has a strong adaptability, small construction impact on the environment andthe advantages of good ability to control the deformation of foundation pit.It is widelyused in foundation pit supporting engineering.Design method of foundation pitsupporting project often USES the conservative method.If we can make reasonabledetail parameters optimization, it has great economic benefits.Engineering designwork need to meet the constraint conditions, and at the same time to save materials,reduce cost containment.So it is necessary to strengthen the inner supportingconditions of bottom of pile of research on the theory and the numerical simulation ofthe deformation calculation.It accumulated certain experience for engineering.Combining with maanshan Yin Long building foundation pit supporting designof underground garage engineering instance,this article detailed introduces the designprinciple of row piles-braced retaining systerm and earth pressure theory,make thetheory of design calculation and stability analysis for the engineering example.Afterusing the ABAQUS finite element software,the excavation and supporting offoundation pit are analyzed in numerical simulation.this article detailed analysis of thefoundation pile and soil interaction.The pile spacing, pile length, pile diameter, innersupport setting the parameters of the position adjustment, compare to each other. It isconcluded that the following rules:(1)Support within the settings for the current a little effects on the deformation ofthe excavation after, support only for subsequent excavation work.Because beforesupport excavation of soil stress is released in full.This project effectively limit thehorizontal displacement of the pile body with the support of applying.The next stepexcavation deformation and stress state are obviously constraints.(2)Soil pile after the maximum horizontal displacement occurred in8to10meter,and the underground foundation pit edge1.52meter,,the Value decreases withincreasing distance.Maximum pile vertical subsidence of soil displacement occurredat the top edge away from the pile tip2-3m, and then decreases with increasingdistance.Pile soil before the maximum horizontal displacement occurred in3-4meter pile position.(3)Through the selection of parameters for different pile diameter, pile diameterincreased in a certain range will reduce soil horizontal displacement regularly.Butmore than a certain degree, pile diameter horizontal displacement increase slowly.And pile diameter after hours, it can make the horizontal displacement increaserapidly, the security of foundation pit instability.(4)This engineering design work safe and reliable,but the safety of the reservedreserve also is very big.In this paper, under the premise that guarantees the stability offoundation pit, pile diameter pile long size appropriately, improve the pilespacing.Make new plan within the controllable changes in displacement reducednearly56%of the raw materials, greatly improving the ratio of foundation pitengineering.Based on the simulation analysis of maanshan Yin Long building foundation pitengineering, underground garage is pointed out that the engineering design isreasonable and conservative.In this paper, the conclusion and rule is likely toaccumulate experience for the forecast of deformation in the region, and also providehelp for the construction of the foundation pit engineering.