Finite element correction method for improving the calculation accuracy of bearing capacity of long-short pile composite foundation

CN122655462BActive Publication Date: 2026-10-16CHINA POWER CONSTR FOURTEENTH BUREAU URBAN CONSTR INVESTMENT CO LTD +1
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Patent Information

Application Number
CN202611104189.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-07-24
Publication Date
2026-10-16
Estimated Expiration
2046-07-24

AI Technical Summary

Technical Problem

[0003]然而，现有的长短桩复合地基承载力计算方法，大多基于理想化的桩土完全接触和同步受力假定，没有结合施工实测数据（如桩顶标高）来反映各桩在加载初期存在的起承时序差异

Benefits of technology

[0007] Based on the embodiments provided in this application, by receiving construction records, measured data of pile top elevation, and measured data of cushion layer thickness, the actual thickness distribution and initial contact gap of the cushion layer at each pile location can be reconstructed. This allows for the quantitative acquisition of pile top contact timing determination data, thereby incorporating construction discrete characteristics into the calculation model. On this basis, a dual-model comparison calculation is performed using a synchronous load-bearing benchmark finite element model and a non-synchronous bearing correction finite element model. Based on the comparison data of the bearing response output by both models, sections that deviate from the ideal synchronous load-bearing assumption during the actual bearing evolution process, as well as sections where feature points may be misjudged, can be accurately identified, thus generating targeted bearing capacity correction results. This method effectively compensates for the prediction bias caused by neglecting non-synchronous pile top bearing in existing calculation methods, improves the accuracy of bearing capacity calculation for composite foundations with long and short piles, and better meets the bearing capacity analysis needs under actual engineering conditions such as fluctuating pile top elevation and uneven cushion layer thickness.

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Abstract

The application discloses a finite element correction method for improving the calculation accuracy of the bearing capacity of long-short pile composite foundation, and relates to the technical field of foundation engineering. The method comprises the following steps: forming discrete characteristic data in a completed construction state; obtaining pile top contact time sequence judgment data according to the discrete characteristic data in the completed construction state; inputting design parameters, pile body material parameters, pile surrounding soil material parameters and the pile top contact time sequence judgment data into a synchronous stress reference finite element model and a non-synchronous starting bearing correction finite element model, and outputting double-model calculation task data; performing hierarchical loading finite element calculation based on the double-model calculation task data, and obtaining synchronous stress bearing response comparison data and non-synchronous starting bearing bearing response comparison data; determining a bearing evolution deviation section and a characteristic point misjudgment section according to the synchronous stress bearing response comparison data and the non-synchronous starting bearing bearing response comparison data, and generating bearing capacity correction result data. The application improves the calculation accuracy of the bearing capacity of long-short pile composite foundation.
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