The Comprehensive Correcting Method Research Of Existing Building With Anchor Static Pile Combined With Surcharge Preloading

The anchor static pressure pile is a construction reinforcement method by our developed foundation. This paper is that a high-rise building takes the anchor static pressure pile combined with surcharge pressure comprehensive rectification, carrying out anchor jacked pile with load weight comprehensive correcting method research:The anchor static pressure pile under the upper vertical loads, pile on the pile soil compaction effect, assume that the pile of soil constitutive relation as the cavity expansion in plane strain problem, put forward the anchor rod static pressure pile under vertical load in a pile soil calculation model, combined with the elastic-plastic mechanics, deduces the pile week of soil plastic zone displacement and plastic zone radius calculation formula, analysis the soil parameter variations and different soil depth on the pile soil plastic zone radius of influence of anchor jacked pile, compacting effect law, expand the theory of cavity expansion in the scope of application of anchor rod static pressure pile. Combined with the ANSYS software by using plane strain model, considering pile soil elastic-plastic constitutive relation and the pile-soil friction problem, using the pile soil contact analysis, more accord with actual pile pressing situation, a practical formula of pile soil plastic zone radius contrast the numerical analysis results, both results are in good agreement, reflected the soil around pile plastic district radius formulas.Both the construction of pile anchor jacked pile is adopted in combination with heaped load weight method in construction, according to the obtained soil around pile radius of plastic zone, the reasonable arrangement of the anchor rod static pressure pile construction sequence and anchor jacked pile arrangement, reducing pressure pile soil compaction effect on correcting the adverse effects caused by the project, construction at any time settlement inclined monitoring, analysis of settlement observation data of Engineering rectifying tilt, achieved good results.