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This thesis is focused on the development of Henan Building drilling pile group pile foundation variable rigidity design combined pile cushion pile side of the joint grouting the patented process engineering instance , a summary and analysis of the optimization of the design and construction process , the main contents are as follows: first , combined with the characteristics of the Henan development Building , the use of variable rigidity design theory , adjust the foundation pile soil stiffness distribution , the original program of pile foundation design optimization , variable stiffness of pile group foundation , satisfied with the technical and economic effects . Then , in order to improve the bearing capacity of the pile and reliability to meet the design requirements, the bottom of the pile , the pile side of the joint grouting patented technology ; and described the test pile , pile construction , the detection process after grouting technology process principles , construction methods , means of control, the test for detection of the economic effects analysis and research . Finally, Henan Building, the main settlement of the geological survey predicted values ??are calculated empirical formula predicted and measured values ??of the comparison, analysis , and further validate the effect of pile group variable rigidity control to optimize the design of high-rise buildings settling differences .
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