CN-121835514-B - Method, device and equipment for calculating dynamic shear strain of deep sea sediment

CN121835514BCN 121835514 BCN121835514 BCN 121835514BCN-121835514-B

Abstract

The application provides a deep sea sediment dynamic shear strain calculation method, device and equipment, which are characterized in that firstly, a test is carried out to collect transient disturbance response data and long-term creep deformation data, a dynamic shear rheological constitutive equation comprising static strain components and dynamic strain components is constructed, each strain component is expressed through structural evolution parameters related to time, then parameters in the constitutive equation are calibrated by using the collected data, and the parameters are substituted into the constitutive equation to obtain a calculation result, so that the structural evolution parameters are innovatively introduced to couple the transient disturbance and the long-term creep characteristics, the high-precision calculation of the dynamic shear strain is realized through dynamic-static separation solution and multi-parameter collaborative prediction, the method is applicable to different shear stress and loading frequency working conditions, and reliable theoretical support is provided for the safe operation design of a deep sea mining vehicle.

Inventors

RAO QIUHUA
WU XIANG
LIU ZELIN
YI WEI
JIN SHAOBO
SHEN KAI
YANG WENTAO

Assignees

中南大学

Dates

Publication Date: 20260508
Application Date: 20260310

Claims (9)

1. A method for calculating dynamic shear strain of deep sea sediment, comprising the steps of: Developing a dynamic shear rheological test of the target deep sea sediment, and collecting transient disturbance response data and long-term creep deformation data; Constructing a dynamic shear rheological constitutive equation based on a Burgers rheological element model, wherein the dynamic shear rheological constitutive equation comprises a static strain component and a dynamic strain component, and the static strain component and the dynamic strain component are expressed through structure evolution parameters related to time; Calibrating parameters in the dynamic shear rheological constitutive equation by using the transient disturbance response data and the long-term creep deformation data, and Obtaining the calculation result of the dynamic shear rheological constitutive equation by using the calibrated parameters, The dynamic shear rheological constitutive equation is as follows: Wherein t is the time of the time, For the total dynamic shear strain of the target deep sea sediment under the corresponding working condition, Is a static shear stress, and is a static shear stress, In order to achieve an instantaneous shear modulus, 、 For the modulus of viscosity, In order to achieve a shear modulus, the polymer is, , In order to load the frequency of the signal, , As a parameter of the evolution of the structure, , In order to be a structural stability characteristic time, In order to stabilize the shear modulus, Is the ratio of instantaneous shear stress to shear strain.
2. The deep sea sediment dynamic shear strain calculation method of claim 1, wherein calibrating parameters in the dynamic shear rheological constitutive equation using the transient disturbance response data and the long-term creep deformation data, specifically comprises: selecting intermediate curves of each loading frequency data set to construct a global data set, and adopting a least square method to fit and determine parameters 、、 And And (C) sum Obtaining structural stability characteristic time by local fitting 。
3. The method for calculating the dynamic shear strain of the deep sea sediment according to claim 2, wherein the fitting process uses a root mean square variation coefficient as an evaluation index.
4. The method for calculating the dynamic shear strain of the deep sea sediment according to claim 1, wherein the calculating result of the dynamic shear rheological constitutive equation is obtained by using the calibrated parameters, and the method specifically comprises the following steps: Separating the static strain component and the dynamic strain component; substituting the calibrated parameters into the static strain component and the dynamic strain component respectively, calculating to obtain a static strain component calculation result and a dynamic strain component calculation result, and And superposing the static strain component calculation result and the dynamic strain component calculation result to obtain the calculation result of the dynamic shear rheological constitutive equation.
5. The method for calculating dynamic shear strain of deep sea sediment according to claim 1, the method is characterized in that the method for calculating the dynamic shear strain of the deep sea sediment further comprises the following steps: and predicting parameters in the dynamic shear rheological constitutive equation under unknown frequency by adopting a piecewise three-time Hermite interpolation and flexibility increment method.
6. The method for calculating the dynamic shear strain of the deep sea sediment according to claim 1, wherein the dynamic shear rheological test of the target deep sea sediment is carried out, specifically: obtaining physical parameters and dynamic shear loading working condition parameters of the target deep sea sediment, and And carrying out a dynamic shear rheological test of the target deep sea sediment based on the physical parameter and the dynamic shear loading working condition parameter.
7. The method for calculating dynamic shear strain of deep sea sediment according to claim 1, the method is characterized in that the method for calculating the dynamic shear strain of the deep sea sediment further comprises the following steps: and verifying the calculation reliability of the calculation result by using the root mean square variation coefficient of the test data.
8. A deep sea sediment dynamic shear strain computing device, comprising: the acquisition unit is used for carrying out a dynamic shear rheological test of the target deep sea sediment and acquiring transient disturbance response data and long-term creep deformation data; the construction unit is used for constructing a dynamic shear rheological constitutive equation based on the Burgers rheological element model, wherein the dynamic shear rheological constitutive equation comprises a static strain component and a dynamic strain component, and the static strain component and the dynamic strain component are expressed through structure evolution parameters related to time; A calibration unit for calibrating parameters in the dynamic shear rheological constitutive equation by using the transient disturbance response data and the long-term creep deformation data, and A calculation unit for obtaining the calculation result of the dynamic shear rheological constitutive equation by using the calibrated parameters, The dynamic shear rheological constitutive equation is as follows: Wherein t is the time of the time, For the total dynamic shear strain of the target deep sea sediment under the corresponding working condition, Is a static shear stress, and is a static shear stress, In order to achieve an instantaneous shear modulus, 、 For the modulus of viscosity, In order to achieve a shear modulus, the polymer is, , In order to load the frequency of the signal, , As a parameter of the evolution of the structure, , In order to be a structural stability characteristic time, In order to stabilize the shear modulus, Is the ratio of instantaneous shear stress to shear strain.
9. An electronic device comprising a processor, and a memory coupled to the processor, The memory is used for storing a computer program; the processor for executing the computer program stored in the memory to cause the electronic device to perform the deep sea sediment dynamic shear strain calculation method as claimed in any one of claims 1-7.

Description

Method, device and equipment for calculating dynamic shear strain of deep sea sediment Technical Field The application relates to the technical field of data processing, in particular to a method, a device and equipment for calculating dynamic shear strain of deep sea sediment. Background As global mineral resource demand continues to rise, deep sea mineral resource development has become an important direction to support future economies and energy security. The deep sea mining vehicle is used as core equipment of a deep sea mining system, and the operation stability of the deep sea mining vehicle directly influences the mining efficiency and the safety. However, the deep sea soft sediment has the characteristics of high water content, low shear strength and obvious rheological property, and under the dynamic load effects of starting, accelerating, vibrating disturbance and the like of the mining vehicle, the problems of slipping, sinking and the like of the mining vehicle are caused by transient structural damage and long-term creep deformation easily to occur. Dynamic shear strain is a core parameter for representing deep sea sediment rheological characteristics and structural evolution, and the calculation accuracy directly determines the reliability of mining vehicle traction optimization and starting strategy formulation. The existing sediment rheological model focuses on static load or steady-state working conditions, transient response characteristics from structural failure to steady-state transition under dynamic disturbance cannot be fully considered, and the synergistic effect of uncoupled loading frequency and shear stress is not achieved. The conventional model adopts a normal parameter constitutive relation, so that the mechanical characteristic evolution caused by sediment microstructure rearrangement is difficult to accurately describe, the defect of insufficient precision and limited application range of dynamic shear strain prediction is caused, and reliable theoretical support cannot be provided for the safety design of the deep sea mining vehicle. In view of the foregoing, there is a need for a general method for calculating dynamic shear strain of deep sea sediment, which can be used for conveniently, rapidly and accurately calculating dynamic shear strain of deep sea sediment, and further for analyzing start-up slip dynamics of a mining vehicle. Disclosure of Invention The application provides a method, a device and equipment for calculating dynamic shear strain of deep sea sediment, which can solve one of the problems in the background technology. In order to achieve the above purpose, the application adopts the following technical scheme: in a first aspect, a method for calculating dynamic shear strain of deep sea sediment is provided, including: Developing a dynamic shear rheological test of the target deep sea sediment, and collecting transient disturbance response data and long-term creep deformation data; Constructing a dynamic shear rheological constitutive equation based on a Burgers rheological element model, wherein the dynamic shear rheological constitutive equation comprises a static strain component and a dynamic strain component, and the static strain component and the dynamic strain component are expressed through structure evolution parameters related to time; Calibrating parameters in the dynamic shear rheological constitutive equation by using the transient disturbance response data and the long-term creep deformation data, and And obtaining a calculation result of the dynamic shear rheological constitutive equation by using the calibrated parameters. In one possible design manner of the first aspect, the dynamic shear rheological constitutive equation is: Wherein t is the time of the time, For the total dynamic shear strain of the target deep sea sediment under the corresponding working condition,Is a static shear stress, and is a static shear stress,In order to achieve an instantaneous shear modulus,、For the modulus of viscosity,In order to achieve a shear modulus, the polymer is,,In order to load the frequency of the signal,,As a parameter of the evolution of the structure,,In order to be a structural stability characteristic time,In order to stabilize the shear modulus,Is the ratio of instantaneous shear stress to shear strain. In one possible design manner of the first aspect, the calibrating the parameters in the dynamic shear rheological constitutive equation by using the transient disturbance response data and the long-term creep deformation data specifically includes: selecting intermediate curves of each loading frequency data set to construct a global data set, and adopting a least square method to fit and determine parameters 、、AndAnd (C) sum Obtaining structural stability characteristic time by local fitting。 In one possible design of the first aspect, the fitting process uses a root mean square variation coefficient as the evaluation index. In one possi