Research on strengthening technology of existing building foundation under complex geological conditions
In order to prevent secondary deformation of a brick-concrete residential building when reinforcing a brick-concrete residential building with uneven settlement,the reinforcement method of reinforcing the strip foundation with miniature steel pipe piles,then adding a new raft slab,and finally grouting the foundation soil was adopted.On the basis of on-site static load test,ABAQUS was used to carry out simulation calculations of the reinforcement scheme,and on-site settlement monitoring was carried out for the reinforced building.The results show that the simulation results are basically consistent with the measured results of the stat-ic load test,and the uneven settlement of the reinforced building is obviously reduced,and the distribution of the pile top reaction force presents the characteristic of small middle and large surrounding;the load borne by the miniature steel pipe pile accounts for 19.43%.The settlement rate in the last 100 d of actual on-site monitoring was less than 0.01～0.04 mm/d,and the deformation of the foundation was in accordance with the requirements of the specification,which made the reinforcement programme feasible.
reinforcement of existing buildingsuneven settlementreinforcement planfinite element analysisreinforcement effect
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