CN-122021201-A - Method for analyzing bearing performance of prestressed concrete pile based on finite element

CN122021201ACN 122021201 ACN122021201 ACN 122021201ACN-122021201-A

Abstract

The invention relates to the technical field of data processing, in particular to a method for analyzing the bearing performance of a prestressed concrete pile based on finite elements. The method comprises the steps of carrying out iterative correction on first compactness information before pile sinking in a pile sinking area based on sinking orders of a plurality of piles in a pile group to obtain second compactness information after pile sinking, carrying out pile sinking performance prediction according to the second compactness information to obtain prediction performance information indicating bearing performance of the pile group, wherein an ith iteration in iterative correction comprises the steps of determining radial environment stress and radial pile sinking stress corresponding to a target position in the ith iteration based on the soil compactness corresponding to the target position in the ith-1 iteration, and optimizing the soil compactness corresponding to the target position in the ith-1 iteration according to the radial environment stress and the radial pile sinking stress to obtain the soil compactness corresponding to the target position in the ith iteration. The invention can dynamically adapt to the soil layer compactness change in the pile sinking process, and improves the accuracy of the predicted pile foundation bearing performance.

Inventors

CAI CHUANSHENG
AN YONGQIANG
ZHU JINFU
LIU LEI

Assignees

中国港湾工程有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. A method for analyzing the bearing performance of a prestressed concrete pile based on finite elements, which is characterized by comprising the following steps: Iteratively correcting first compactness information of a pile sinking area based on the sinking sequence of a plurality of piles in a pile group to obtain second compactness information, wherein the piles are prestressed concrete pipe piles, the first compactness information is used for indicating the soil layer compactness of each position in the pile sinking area before pile group intervention, and the second compactness information is used for predicting the soil layer compactness of each position in the pile sinking area after pile group pile sinking is completed; predicting pile sinking performance according to the second compactness information to obtain predicted performance information indicating the bearing performance of the pile group; the ith iteration of the iterative correction includes: Determining radial environmental stress and radial pile sinking stress corresponding to a target position in an ith iteration based on soil layer compactness corresponding to the target position in the ith iteration, wherein the target position is one position in a pile sinking area, the radial environmental stress is radial stress naturally generated by the intervention of a corresponding pile in the corresponding iteration due to the intervention of the corresponding pile in a soil layer, the radial pile sinking stress is radial stress formed by pile sinking energy conduction of the corresponding pile in the corresponding iteration, i is a positive integer, and the soil layer compactness corresponding to the target position in the ith iteration when i=1 is derived from the first compactness information; And optimizing the soil compactness corresponding to the target position in the ith iteration according to the radial environmental stress and the radial pile sinking stress corresponding to the target position in the ith iteration, so as to obtain the soil compactness corresponding to the target position in the ith iteration.
2. The method for analyzing the bearing performance of the prestressed concrete pile based on the finite element according to claim 1, wherein the step of acquiring the radial environmental stress corresponding to the target position in the ith iteration comprises the following steps: Determining compaction influence factors corresponding to the target positions in the ith iteration according to the column radius of the pile corresponding to the ith iteration, the interval distance between the target positions and the sinking positions corresponding to the ith iteration and the median particle size of sand of the target positions, wherein the compaction influence factors indicate the degree of influence of the corresponding pile on the corresponding positions; And determining the radial environment stress corresponding to the target position in the ith iteration according to the radial environment stress corresponding to the target position in the ith iteration, the force efficiency value corresponding to the target position in the ith iteration and the compaction influence factor corresponding to the target position in the ith iteration, wherein the force efficiency value indicates the radial environment stress conduction efficiency of the corresponding position in the corresponding iteration, and the radial environment stress corresponding to the target position in the ith iteration is determined based on the first compactness information when i=1.
3. The method for analyzing bearing performance of a prestressed concrete pile based on finite elements according to claim 2, wherein the step of determining the compaction influence factor corresponding to the target position in the ith iteration according to the column radius of the pile corresponding to the ith iteration, the distance between the target position and the sinking position corresponding to the ith iteration, and the median particle diameter of the sand of the target position comprises the steps of: analyzing the difference between the column radius of the pile corresponding to the ith iteration and the median particle diameter of sand at the target position to obtain a pile particle difference value corresponding to the target position in the ith iteration; And determining a compaction influence factor corresponding to the target position in the ith iteration according to the pile grain difference value corresponding to the target position in the ith iteration and the interval distance between the target position and the sinking position corresponding to the ith iteration, wherein the compaction influence factor and the corresponding pile grain difference value are in positive correlation, and the compaction influence factor and the corresponding interval distance are in negative correlation.
4. The method for analyzing the bearing performance of the prestressed concrete pile based on the finite element according to claim 2, wherein the force efficiency value is determined based on an internal friction angle of a corresponding position in a corresponding iteration, and the internal friction angle of a target position in an ith iteration is determined based on soil compaction corresponding to the target position in the ith-1 th iteration.
5. The method for analyzing bearing performance of a prestressed concrete pile based on finite elements according to claim 4, wherein the step of determining the radial environmental stress corresponding to the target position in the ith iteration according to the radial environmental stress corresponding to the target position in the ith-1 iteration, the force efficiency value corresponding to the target position in the ith iteration, and the compaction influence factor corresponding to the target position in the ith iteration comprises the steps of: according to the force efficiency value corresponding to the target position in the ith iteration, nonlinear modulation is carried out on the compaction influence factor corresponding to the target position in the ith iteration to obtain a stress correction coefficient corresponding to the target position in the ith iteration, wherein the compaction influence factor corresponding to the target position in the ith iteration is greater than 1, and the force efficiency value corresponding to the target position in the ith iteration is also greater than 1; And calculating the product of the stress correction coefficient corresponding to the target position in the ith iteration and the radial environment stress corresponding to the target position in the ith-1 iteration to obtain the radial environment stress corresponding to the target position in the ith iteration.
6. The method for analyzing the bearing performance of the prestressed concrete pile based on the finite element according to claim 1, wherein the step of acquiring the radial pile sinking stress corresponding to the target position in the ith iteration comprises the following steps: Determining the energy conversion rate of the target position in the ith iteration according to the interval distance between the target position and the sinking position corresponding to the ith iteration, the column radius of the pile corresponding to the ith iteration, the shearing resistance parameter of the target position in the ith iteration and the soil layer compactness corresponding to the target position in the ith-1 th iteration, wherein the energy conversion rate indicates the efficiency of converting pile sinking energy under the corresponding iteration into radial stress at the corresponding position, and the shearing resistance parameter indicates the maximum shearing strength of unit effective normal stress of the corresponding position under the corresponding iteration; And determining the radial pile sinking stress corresponding to the target position in the ith iteration according to the energy conversion rate of the target position in the ith iteration and the pile sinking energy corresponding to the ith iteration.
7. The method for analyzing bearing performance of a prestressed concrete pile based on finite elements according to claim 6, wherein the shearing resistance parameter of the target position in the ith iteration is determined based on the tangent value of the internal friction angle of the target position in the ith iteration, and the internal friction angle of the target position in the ith iteration is determined based on the soil compaction degree corresponding to the target position in the ith-1 th iteration.
8. The method for analyzing the bearing performance of the prestressed concrete pile based on the finite element according to claim 6, wherein the energy conversion rate and the corresponding interval distance are in negative correlation, the energy conversion rate and the corresponding column radius are in positive correlation, the energy conversion rate and the corresponding shearing parameter are in positive correlation, and the energy conversion rate and the corresponding soil compaction degree are in positive correlation.
9. The method for analyzing bearing performance of a prestressed concrete pile based on finite elements according to claim 1, wherein the step of optimizing the soil compaction corresponding to the target position in the i-1 th iteration according to the radial environmental stress and the radial pile sinking stress corresponding to the target position in the i-th iteration to obtain the soil compaction corresponding to the target position in the i-th iteration comprises the steps of: According to the radial environmental stress and the radial pile sinking stress corresponding to the target position in the ith iteration, determining the radial comprehensive stress corresponding to the target position in the ith iteration; Analyzing the difference between the radial comprehensive stress corresponding to the target position in the ith iteration and the radial reference stress, and determining the radial stress intensity corresponding to the target position in the ith iteration; and optimizing the soil compactness corresponding to the target position in the ith iteration according to the radial stress intensity corresponding to the target position in the ith iteration, so as to obtain the soil compactness corresponding to the target position in the ith iteration.
10. The method for analyzing bearing performance of a prestressed concrete pile based on finite elements according to claim 9, wherein the step of optimizing the soil layer compactness corresponding to the target position in the i-1 th iteration according to the radial stress intensity corresponding to the target position in the i-th iteration to obtain the soil layer compactness corresponding to the target position in the i-th iteration comprises the steps of: determining a pore ratio change index corresponding to the target position in the ith iteration, wherein the redundant pore ratio corresponding to the target position in the ith iteration indicates the soil layer pore closing difficulty of the target position in the ith iteration; And amplifying the soil layer compactness corresponding to the target position in the ith iteration by using the pore ratio change index corresponding to the target position in the ith iteration to obtain the soil layer compactness corresponding to the target position in the ith iteration.

Description

Method for analyzing bearing performance of prestressed concrete pile based on finite element Technical Field The invention relates to the technical field of data processing, in particular to a method for analyzing the bearing performance of a prestressed concrete pile based on finite elements. Background The prestressed concrete pipe pile is used as a main bearing member in building foundation treatment and pile foundation engineering, and the stress performance of the prestressed concrete pipe pile is directly related to the safety and stability of an upper structure. When pile foundation setting is carried out in a sandy soil area based on a static pressure method, the conventional pile foundation bearing capacity evaluation is mostly dependent on static load tests and empirical formulas, and soil layer change in a pile sinking process is difficult to adapt, so that the follow-up predicted pile foundation bearing performance is inaccurate. Disclosure of Invention The invention aims to provide a method for analyzing the bearing performance of a prestressed concrete pile based on finite elements, which is used for solving the technical problem that the prediction accuracy of the bearing performance of a pile foundation is insufficient in the prior art. In a first aspect, an embodiment of the present invention provides a method for analyzing bearing performance of a prestressed concrete pile based on finite elements, the method comprising: Iteratively correcting first compactness information of a pile sinking area based on the sinking sequence of a plurality of piles in a pile group to obtain second compactness information, wherein the piles are prestressed concrete pipe piles, the first compactness information is used for indicating the soil layer compactness of each position in the pile sinking area before pile group intervention, and the second compactness information is used for predicting the soil layer compactness of each position in the pile sinking area after pile group pile sinking is completed; predicting pile sinking performance according to the second compactness information to obtain predicted performance information indicating the bearing performance of the pile group; the ith iteration of the iterative correction includes: Determining radial environmental stress and radial pile sinking stress corresponding to a target position in an ith iteration based on soil layer compactness corresponding to the target position in the ith iteration, wherein the target position is one position in a pile sinking area, the radial environmental stress is radial stress naturally generated by the intervention of a corresponding pile in the corresponding iteration due to the intervention of the corresponding pile in a soil layer, the radial pile sinking stress is radial stress formed by pile sinking energy conduction of the corresponding pile in the corresponding iteration, i is a positive integer, and the soil layer compactness corresponding to the target position in the ith iteration when i=1 is derived from the first compactness information; And optimizing the soil compactness corresponding to the target position in the ith iteration according to the radial environmental stress and the radial pile sinking stress corresponding to the target position in the ith iteration, so as to obtain the soil compactness corresponding to the target position in the ith iteration. In some embodiments, the step of obtaining the radial environmental stress corresponding to the target position in the ith iteration includes: Determining compaction influence factors corresponding to the target positions in the ith iteration according to the column radius of the pile corresponding to the ith iteration, the interval distance between the target positions and the sinking positions corresponding to the ith iteration and the median particle size of sand of the target positions, wherein the compaction influence factors indicate the degree of influence of the corresponding pile on the corresponding positions; And determining the radial environment stress corresponding to the target position in the ith iteration according to the radial environment stress corresponding to the target position in the ith iteration, the force efficiency value corresponding to the target position in the ith iteration and the compaction influence factor corresponding to the target position in the ith iteration, wherein the force efficiency value indicates the radial environment stress conduction efficiency of the corresponding position in the corresponding iteration, and the radial environment stress corresponding to the target position in the ith iteration is determined based on the first compactness information when i=1. In some embodiments, the step of determining the compaction impact factor corresponding to the target position in the ith iteration according to the column radius of the pile corresponding to the ith iteration, the distance between the target p