CN-121997667-A - Pile foundation response analysis method, device, equipment and product under vertical load

CN121997667ACN 121997667 ACN121997667 ACN 121997667ACN-121997667-A

Abstract

The invention relates to the technical field of offshore piles and discloses a pile foundation response analysis method, device, equipment, medium and product under vertical load, wherein the method comprises the steps of obtaining parameter values of non-drainage shear strength and initial shear modulus of a target field soil layer, determining a first association relationship among static stress, plastic strain and total strain in the target field soil layer according to a static stress-total strain curve; determining a third association between static stress and elastic strain according to the second association among the total strain, the elastic strain and the plastic strain and the first association; according to a fourth association relation between static stress and friction resistance, a fifth association relation between pile body settlement, plastic strain and elastic strain and a third association relation, a t-z model curve is determined.

Inventors

YU GUANGMING
CHEN CHUAN
LIU ZHONGYUAN
ZHANG YOUHU
WANG CHEN
Wang Diefan
DAI JIALIN
GUO PENG
CHEN MEIHE
ZHAI HANBO
LIU XIANGYIN

Assignees

中国长江三峡集团有限公司
东南大学

Dates

Publication Date: 20260508
Application Date: 20260128

Claims (11)

1. The pile foundation response analysis method under vertical load is characterized by comprising the following steps: Acquiring parameter values of the non-drainage shear strength and the initial shear modulus of a target field soil layer, and a static stress-total strain curve, wherein the static stress-total strain curve is used for representing the relationship among static stress, plastic strain, initial shear modulus, non-drainage shear strength and total strain; determining a first association between static stress, plastic strain and total strain in the target field soil layer by combining parameter values of the non-drainage shear strength and the initial shear modulus of the target field soil layer and the static stress-total strain curve; Determining a third association relationship between the static stress and the elastic strain according to a second association relationship among the total strain, the elastic strain and the plastic strain and a first association relationship among the static stress, the plastic strain and the total strain; determining a t-z model curve representing the mapping relation between the friction resistance and the pile body settlement according to a fourth association relation between the static stress and the friction resistance, a fifth association relation between the pile body settlement and the plastic strain and the elastic strain and a third association relation between the static stress and the elastic strain; and embedding the t-z model curve into a finite element model, and analyzing pile foundation response under vertical load by utilizing the finite element model to the target field soil layer.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises, The first association relation among static stress, plastic strain and total strain in the target field soil layer is as follows: Wherein, the As a result of the total strain, In the event of a stress being applied to the substrate, Is the non-drainage shear strength of the soil body, Is the static stress of the steel plate, and the steel plate is in a static state, For the initial shear modulus of the material, Is plastic strain.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises, The second association relationship among the total strain, the elastic strain and the plastic strain is as follows: Wherein, the As a result of the total strain, In order to be elastically strained, the elastic strain, Is plastic strain.
4. The method of claim 3, wherein the step of, The third association relationship between the static stress and the elastic strain is: Wherein, the In order to be elastically strained, the elastic strain, In the event of a stress being applied to the substrate, Is the non-drainage shear strength of the soil body, Is the static stress of the steel plate, and the steel plate is in a static state, Is the initial shear modulus.
5. The method of claim 4, wherein the step of determining the position of the first electrode is performed, The fourth association relationship between the static stress and the friction resistance is as follows: Wherein, the In order to achieve the effect of side friction resistance, For the maximum of the side friction resistance, In the event of a stress being applied to the substrate, Is the non-drainage shear strength of the soil body, Is static stress.
6. The method of claim 5, wherein the step of determining the position of the probe is performed, The fifth association relation between pile body settlement, plastic strain and elastic strain is as follows: Wherein, the For the relative axial displacement of the pile-soil, Is the diameter of the pile, the diameter of the pile is the diameter of the pile, For the elastic mapping coefficient(s), For the plastic-map coefficient to be a function of the plastic-map coefficient, In order to be elastically strained, the elastic strain, Is plastic strain.
7. The method according to claim 1, wherein the method further comprises: obtaining actual measurement pile load data of the offshore pile in the target site, and actual measurement section axial forces and vertical displacement of the actual measurement seabed at different positions along the depth of the pile; Constructing a finite element beam-spring analysis model by adopting the t-z model curve as a boundary condition; Inputting the actual measurement pile load data into the finite element beam-spring analysis model for pile foundation response analysis under vertical load to obtain section axial forces at different positions along the depth of the pile and vertical displacement at the seabed; determining an actual measurement curve according to the actual measurement section axial force at different positions and the vertical displacement at the actual measurement seabed, wherein the actual measurement curve is used for representing the relationship between the actual measurement section axial force at different positions and the vertical displacement at the actual measurement seabed; Determining an analysis curve according to the section axial forces at different positions and the vertical positions at the seabed, wherein the analysis curve is used for representing the relationship between the section axial forces at different positions and the vertical displacement at the seabed; And determining the accuracy of the t-z model curve according to the correlation between the measured curve and the analysis curve.
8. A pile foundation response analysis device under vertical load, the device comprising: the data acquisition module is used for acquiring parameter values of the non-drainage shear strength and the initial shear modulus of the target field soil layer and a static stress-total strain curve; The first association relation confirming module is used for combining parameter values of the non-drainage shear strength and the initial shear modulus of the target field soil layer and the static stress-total strain curve to determine a first association relation among static stress, plastic strain and total strain in the target field soil layer; The third association confirming module is used for confirming the third association between the static stress and the elastic strain according to the second association between the total strain, the elastic strain and the plastic strain and the first association between the static stress, the plastic strain and the total strain; The model calculation module is used for determining a t-z model curve representing the mapping relation between the friction resistance and the pile body settlement according to a fourth association relation between the static stress and the friction resistance, a fifth association relation between the pile body settlement and the plastic strain and the elastic strain and a third association relation between the static stress and the elastic strain; And the response analysis module is used for embedding the t-z model curve into a finite element model, and carrying out pile foundation response analysis on the target field soil layer under vertical load by utilizing the finite element model.
9. An electronic device, comprising: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method of pile foundation response under vertical load of any one of claims 1 to 6.
10. A computer-readable storage medium having stored thereon computer instructions for causing a computer to perform the method of pile foundation response under vertical load analysis according to any one of claims 1 to 6.
11. A computer program product comprising computer instructions for causing a computer to perform the method of under-vertical load pile foundation response analysis of any one of claims 1 to 6.

Description

Pile foundation response analysis method, device, equipment and product under vertical load Technical Field The invention relates to the technical field of offshore piles, in particular to a pile foundation response analysis method, device, equipment and product under vertical load. Background The axial load-displacement response of offshore pile foundations is typically analyzed in the beam-column framework, where soil resistance is characterized by t-z springs distributed along the pile shaft and q-z springs concentrated at the pile ends. the calculation methods of t-z and q-z are directly related to the anti-overturning rigidity of the pile foundation as a whole, so that the dynamic characteristics and structural design of the upper structure supported by the pile are affected. Initially single pile jacket foundations were mainly applied to offshore oil and gas platforms, and have been increasingly used in recent years for support of offshore wind turbines. Because offshore wind turbine structures are slim and highly sensitive to dynamic characteristics, for accurate assessment of t-z response, assessment of existing t-z springs typically employs simplified methods or is based on empirical estimation. Although the methods can meet the design requirements to a certain extent, the influence of soil layer characteristics and load characteristics on the pile foundation t-z spring is ignored. Disclosure of Invention The invention provides a pile foundation response analysis method, device, equipment and product under vertical load, which are used for solving the problem that the influence of soil layer characteristics and load characteristics on a pile foundation t-z spring is ignored in the existing evaluation of the t-z spring. In a first aspect, the invention provides a pile foundation response analysis method under vertical load, which is used for obtaining parameter values of non-drainage shear strength and initial shear modulus of a target soil layer and a static stress-total strain curve, wherein the static stress-total strain curve is used for representing the relationship among static stress, plastic strain, initial shear modulus, non-drainage shear strength and total strain; determining a first association relationship among static stress, plastic strain and total strain in the target field soil layer by combining parameter values of non-drainage shear strength and initial shear modulus of the target field soil layer and a static stress-total strain curve; Determining a third association relationship between static stress and elastic strain according to a second association relationship among the total strain, the elastic strain and the plastic strain and a first association relationship among the static stress, the plastic strain and the total strain; Determining a t-z model curve representing the mapping relation between the friction resistance and the pile body settlement according to a fourth association relation between the static stress and the friction resistance, a fifth association relation between the pile body settlement and the plastic strain and the elastic strain and a third association relation between the static stress and the elastic strain; and embedding the t-z model curve into a finite element model, and analyzing pile foundation response under vertical load by utilizing the finite element model to the target field soil layer. The t-z spring model is obtained by obtaining data related to the t-z spring model and obtaining a static stress-total strain curve for mapping and combining an elastic mapping coefficient and a plastic mapping coefficient, and the influence of soil layer characteristics and load characteristics on the pile foundation t-z spring model is considered by the calculation method, so that the t-z spring model is more accurate, and therefore, the t-z model curve is embedded into a finite element model to perform pile foundation response analysis under vertical load on a target field soil layer, and a more accurate analysis result can be obtained. In an alternative embodiment, the first correlation between static stress, plastic strain and total strain in the target site soil layer is: Wherein, the As a result of the total strain,In the event of a stress being applied to the substrate,Is the non-drainage shear strength of the soil body,Is the static stress of the steel plate, and the steel plate is in a static state,For the initial shear modulus of the material,Is plastic strain. In an alternative embodiment, the second correlation between total strain, elastic strain, and plastic strain is: Wherein, the As a result of the total strain,In order to be elastically strained, the elastic strain,Is plastic strain. In an alternative embodiment, the third correlation between static stress and elastic strain is: Wherein, the In order to be elastically strained, the elastic strain,In the event of a stress being applied to the substrate,Is the non-drainage shear strength