| In the construction of sluices in coastal areas,soft soil foundations with low foundation bearing capacity and poor anti-seepage stability are often encountered,which bring many unfavorable factors to the anti-seepage and structural stability of the sluices,and even endanger the safety of the project.In dealing with the problem of soft soil foundation,pile foundation has been widely used because of its high stability,fast construction and easy quality control.For pile foundation sluices,due to the discontinuity of the pile in the foundation and the difference of pile-soil materials,further research is needed on its influence on the seepage field and stress field.Therefore,it is necessary to further study the seepage stability of pile-based sluices.The actual project of the tide gate was cited as an example by the paper,the three-dimensional finite.element software ABAQUS was used to establish the three-dimensional finite element model of the natural foundation and precast pile composite foundation of the tide gate,and analyze and study the seepage field and the stability of the chamber of sluice,and compares with the calculated results analyze,finally,the simulation analysis of the bearing characteristics of the precast pile composite foundation under different pile diameters and pile spacings is carried out.the main work of this paper is as follows.(1)The seepage and stability were calculated,the seepage elements,the anti-sliding stability safety factor and the maximum and minimum ratio of the base stress all meet the requirements of the specification,and the bearing capacity of the foundation under the natural foundation does not meet the requirements.(2)The ABAQUS software was used to establish corresponding calculation model to perform seepage-stress coupling analysis on different layers of natural foundations and Precast pile composite foundation under different working conditions.The results show:for the seepage flow under complex stratum,when only a single stratum is considered and the improved resistance coefficient method is used for calculation,the result has a large error;due to the existence of piles,the composite foundation can reduce the seepage slope at the exit section and play a role in preventing seepage.The seepage slope values under the two working conditions are 0.507 and 0.488 respectively,which meets the requirements of the specification.(3)The ABAQUS software was used for stability of the chamber of sluice analysis of natural foundations and precast pile composite foundation,According to the analysis of the displacement results,the maximum settlement values of the natural foundation under various working conditions are 8.2cm,9.5cm and 8.7cm,and the maximum settlement values of the composite foundation after precast pile reinforcement are 2.1cm,2.3cm and 2.2cm;the horizontal displacement,the anti-sliding stability safety factor and the maximum and minimum base stress ratios all meet the requirements of the specification and are similar to the calculated results.(4)The finite element models for several working conditions with different pile diameters and different pile spacing were built separately based on the tide gate,investigate the effect of pile diameter and pile spacing on the vertical load carrying capacity of group pile foundation by using load-settlement curves of group pile foundation under various working conditions.Research shows that:increasing the pile diameter and reducing the pile spacing can reduce the foundation settlement under the same level of load,increase the pile diameter and reduce the pile spacing can reduce the foundation settlement under the same level of load and improve the group pile foundation bearing capacity,after the pile spacing and pile diameter exceed a certain value,the effect on the group pile bearing capacity improvement and settlement reduction is no longer obvious. |
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