Method, device and medium for calculating degree of consolidation of soft clay foundation with high water content

Abstract

The present invention relates to a method, device and medium for calculating the degree of consolidation of a soft clay foundation with high water content. The method comprises: obtaining basic parameters of a constitutive relationship of a target soil body; obtaining design parameters of a drainage board; obtaining load conditions of a target soil body; calculating a multiplication coefficient; and calculating the degree of consolidation based on an improved Barron algorithm, wherein in the improved Barron algorithm, the smearing effect design value in the Barron algorithm is corrected by a multiplication coefficient. The present invention takes into account the decrease in the unit body permeability coefficient caused by various factors during the consolidation process, and uses a multiplication coefficient to adjust the smearing effect constant to correct the degree of consolidation, thereby effectively reducing the error between the design estimated value and the actual value, being able to more accurately predict the degree of consolidation of the soil body, thereby improving the control preloading effect, and being conducive to the advancement of the project progress.

Description

Technical Field

[0001] The invention relates to a method, equipment and medium for calculating the degree of consolidation of a soft clay foundation with high water content. Background Art

[0002] Soft clay foundation has low bearing capacity and slow strength growth; it is easy to deform unevenly after loading; the deformation rate is large and the stability time is long; it has the characteristics of low permeability, thixotropy and rheology. In the eastern and southern regions of my country, soft clay foundations with high water content are widely distributed. Dredged fill is a fill formed by hydraulic flushing of mud and sand. It is one of the common artificial fills in my country's coastal areas. Its properties are similar to those of soft clay foundations.

[0003] Soft clay foundation cannot be used directly and needs to be treated to accelerate soil drainage and consolidation. Common foundation treatment methods include preloading, replacement, mixing and other methods. For example, the method of setting up prefabricated vertical drainage pipes (also called plastic drainage boards) combined with vacuum / loading preloading is widely used because it is economical and effective.

[0004] In engineering, the degree of consolidation is usually used to indicate the degree of consolidation of foundation soil after the external load is applied. The degree of consolidation is an important parameter for controlling the preloading and unloading time, and has a huge impact on the project duration.

[0005] In the design stage, it is particularly important to accurately predict the degree of consolidation of soft clay foundation. The Barron radial consolidation algorithm is simple in form and has clear physical meanings of parameters. This algorithm is adopted by the Chinese building foundation and fill foundation treatment specifications.

[0006] However, in actual engineering practice, the degree of consolidation of high-water content hydraulic fill mud (especially hydraulic fill soil) predicted by the Barron radial consolidation algorithm is quite different from the actual degree of consolidation, which has a great impact on the control of preloading effect and project progress. Summary of the invention

[0007] The present invention aims to provide a method, a device and a medium for calculating the degree of consolidation of a soft clay foundation with a high water content, so as to solve the problem that the results of calculating the degree of consolidation in the prior art are inaccurate.

[0008] A method for calculating the degree of consolidation of a high-water content soft clay foundation, the method comprising: obtaining basic parameters of a constitutive relationship of a target soil body; obtaining design parameters of a drainage plate; obtaining load conditions of the target soil body; calculating a multiplication coefficient; and calculating the degree of consolidation based on an improved Barron algorithm, wherein in the improved Barron algorithm, the smear effect design value in the Barron algorithm is corrected by the multiplication coefficient.

[0009] In one embodiment, the basic parameters of the constitutive relationship of the target soil are determined by indoor consolidation experiments and permeability tests. The substrate parameters include: initial porosity e1, compression index C c , Rebound Index C s , horizontal permeability coefficient k x , permeability coefficient k of the coating area t , Permeability constant C k .

[0010] In one embodiment, the design parameters of the drainage board include: drainage unit diameter D, drainage board diameter d1, and coating area diameter d2.

[0011] In one embodiment, the load conditions of the soil body, including the initial stress σ1 and the final stress σ2 of the soil body, are determined by investigating the geological survey report and the engineering design plan.

[0012] In one embodiment, the multiplication factor B=W·S; wherein W=k x / k t ; The S value is obtained by the following formula:

[0013]

[0014] n=D / d1,m=d2 / d1;

[0015]

[0016]

[0017] In one embodiment, the smearing effect design value in the Barron algorithm is modified by the multiplication coefficient, including: considering the comprehensive smearing effect constant μ of the multiplication coefficient = ln(n)-0.75+(Ba-1)ln(m), where

[0018] In one embodiment, the degree of consolidation The time factor T r Determined by the following formula: Radial consolidation coefficient c r The following formula determines:

[0019] where t is the consolidation time.

[0020] The present invention further provides a computer device, comprising a memory and a processor, wherein the processor is used to execute a computer program stored in the memory to implement the method described in any one of the above embodiments.

[0021] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, the method described in any one of the above embodiments is implemented.

[0022] The present invention takes into account the decrease in unit body permeability coefficient caused by various factors during the consolidation process of high-water content blown fill mud or blown fill soil, and uses the multiplication coefficient to adjust the smearing effect constant to correct the consolidation degree, thereby effectively reducing the error between the design estimated value and the actual value, and can more accurately predict the soil consolidation degree, thereby improving the control preloading effect, which is conducive to the advancement of engineering progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0024] Figure 1 It is a schematic diagram of the drainage board structure;

[0025] Figure 2 is a flow chart of the method of the present invention;

[0026] Figure 3 It is a schematic diagram comparing the consolidation degree calculation results. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] According to the inventor's research on soft clay foundation with high moisture content, it was found that the permeability coefficient of soft clay foundation with high moisture content decreased seriously during the consolidation process. Compared with the original smear effect design value, the actual smear effect doubled, and the Barron algorithm could not solve this problem, resulting in the inability to accurately estimate the consolidation degree of soft clay foundation with high moisture content.

[0029] Based on this, the basic concept of the present invention is to consider the decrease in unit permeability coefficient caused by various factors during the consolidation process of high-water content blown fill mud or blown fill soil, and use the multiplication factor to adjust the smear effect constant to correct the consolidation degree, thereby effectively reducing the error between the design estimate and the actual value, more accurately predicting the soil consolidation degree, and then improving the control preloading effect, which is conducive to the advancement of project progress.

[0030] The method for calculating the degree of consolidation of the present invention comprises the following steps:

[0031] Step S101, obtaining basic parameters of the constitutive relationship of the target soil;

[0032] Step S102, obtaining drainage board design parameters;

[0033] Step S103, obtaining the load condition of the target soil;

[0034] Step S104, calculating the multiplication coefficient;

[0035] Step S105, calculating the degree of consolidation based on the improved Barron algorithm, wherein in the improved Barron algorithm, the smear effect design value in the Barron algorithm is corrected by a multiplication coefficient.

[0036] Specifically, in step S101, basic parameters of the constitutive relationship of the target soil can be determined by standard geotechnical tests. Standard geotechnical tests belong to the prior art, and can include, for example, indoor consolidation tests and permeability tests.

[0037] In a specific application scenario, the basic parameters include: initial porosity ratio of soil e1 = 2.5, compression index C c =0.9, horizontal permeability coefficient k x =6×10 -3 m / day, permeability constant C k =1.0; permeability coefficient k of the coating area t =6×10 -3 m / day, rebound index C s =0.09.

[0038] In step S102, the design parameters of the drain board can be determined through investigation, including the diameter D of the drain unit, the diameter d1 of the drain board, the diameter d2 of the coating area, and the structure of the drain board. Figure 1 In a specific application scenario, D = 1.0m, d1 = , d2 = 0.25m.

[0039] Step S103, the load conditions of the target soil can be determined by investigating the geological survey report and the engineering design plan. For example, the load conditions of the soil include the initial stress σ1 and the final stress σ2 of the soil, where σ2 = σ1 + Δσ, Δσ is the applied load increment. In a specific application scenario, the load conditions of the soil include: σ0 = 20KPa, Δσ = 100KPa, σ2 = σ1 + Δσ = 120KPa.

[0040] Step S104, the multiplication coefficient is obtained by the following formula:

[0041] B=W·S

[0042] Where W represents the physical smearing effect.

[0043] According to the above specific application scenario, W = k x / k t =1.0; the S value is obtained by the following formula:

[0044]

[0045] Where n = D / d1 = 19, m = d2 / d1 = 4.0, D is the diameter of the drainage unit = 1.0m, d1 is the diameter of the drainage board = 5.3cm, d2 is the diameter of the coating area = 0.25m; the corresponding S0 value is obtained by the following formula:

[0046]

[0047] Where e2 is determined by the following formula:

[0048]

[0049] Finally, in the above specific application scenario, the multiplication coefficient B=2.49 is calculated.

[0050] In step S105, the soil consolidation degree is calculated using the improved Barron consolidation algorithm.

[0051] The radial average consolidation degree U of soil is calculated by the following formula:

[0052]

[0053] Where μ is the comprehensive smearing effect constant taking into account the multiplication factor.

[0054] According to the various parameters involved in the above specific application scenarios, μ = ln(n)-0.75+(Ba-1)ln(m) = 4.27

[0055] The design value a of the smearing effect is determined by the following formula:

[0056]

[0057] Time factor T r is a function of the consolidation time t and is determined by the following formula:

[0058]

[0059] Radial consolidation coefficient c r The following formula determines:

[0060]

[0061] In the above step S105, the comprehensive smearing effect constant reflects the improvement of the Barron algorithm. In addition, only easily accessible basic soil parameters, geometric design parameters and load conditions are used in the calculation. This method is easy to implement and has high practical value in engineering.

[0062] Figure 3 The conventional Barron algorithm, the improved Barron algorithm (the present invention) and the degree of consolidation calculated by the data simulation method are shown. In the figure, time is used as the horizontal axis and the degree of consolidation of the soil is used as the vertical axis. The degree of consolidation calculated by the improved Barron algorithm of the present invention is marked with a solid line, the degree of consolidation calculated by the numerical simulation method is marked with a dotted line, and the degree of consolidation calculated by the Barron consolidation theory is marked with a long and short line. By comparison, it is found that the results of the present invention and the numerical simulation are very close, which also shows that the calculation accuracy of the calculation method is very high.

[0063] Therefore, the present invention provides a better method for estimating the radial consolidation degree of high-water content blown fill mud taking into account the multiplied smearing effect, taking into account the multiplication problem of the smearing effect caused by the decrease in the permeability coefficient of the unit body during the consolidation process of high-water content blown fill mud or blown fill soil, effectively reducing the error between the design estimated value and the measured value, thereby improving the design accuracy and more accurately predicting the soil consolidation degree.

[0064] According to the second aspect of the present invention, the present invention also provides a computer device, which may include a processor, a memory, and may also include a communication interface and a communication bus, etc. The processor, the memory and the communication interface communicate with each other through the communication bus. The processor is used to provide computing and control capabilities. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer program instructions. The internal memory provides an environment for the operation of the operating system and computer program instructions in the non-volatile storage medium. The communication interface of the above-mentioned device is used to communicate with an external terminal in a wired or wireless manner, and the wireless method can be implemented through WIFI, an operator network, NFC (near field communication) or other technologies. The memory is used to store computer program instructions, and the computer program instructions enable the processor to execute the above-mentioned Figure 2 method.

[0065] According to the third aspect of the present invention, the present invention further provides a computer-readable storage medium. A person skilled in the art can understand that the implementation of all or part of the process in the above-mentioned embodiment method can be completed by instructing the relevant hardware through computer program instructions, and the computer program instructions can be stored in a non-volatile computer-readable storage medium. When the computer program instructions are executed, the above-mentioned Figure 2Method. Any reference to memory, storage, database or other medium used in the embodiments provided by the present invention may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory.

[0066] Although this specification has shown and described a plurality of embodiments of the present invention, it is apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, modifications and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The attached claims are intended to define the scope of protection of the present invention, and therefore cover the modular composition, equivalent or alternatives within the scope of these claims.

Claims

1. A method for calculating the degree of consolidation of high-water content soft clay foundation, characterized in that: The method comprises: Obtain the basic parameters of the constitutive relationship of the target soil; Get the design parameters of the drainage board; Obtain the loading conditions of the target soil; Calculate the multiplication factor; The degree of consolidation is calculated based on the improved Barron algorithm, wherein the smear effect design value in the Barron algorithm is corrected by a multiplication coefficient, and the basic parameters of the constitutive relationship of the target soil are determined by indoor consolidation experiments and permeability tests, and the basic parameters include: Initial porosity ratio e1, compression index C c , Rebound Index C s , horizontal permeability coefficient k x , permeability coefficient k of the coating area t , Permeability constant C k The design parameters of the drainage board include: drainage unit diameter D, drainage board diameter d1, smear area diameter d2, and the load conditions of the soil body are determined by investigating the geological survey report and the engineering design plan, including the initial stress σ1 and the final stress σ2 of the soil body. The multiplication factor B = W·S; wherein W = k x / k t ; The S value is obtained by the following formula: n=D / d1,m=d2 / d1; The comprehensive smearing effect constant considering the multiplication coefficient μ=ln(n)-0.75+(Ba-1)ln(m), where Consolidation The time factor T r Determined by the following formula: Radial consolidation coefficient c r The following formula determines: where t is the consolidation time, γ w Indicates the weight of water.

2. A computer device, characterized in that: The invention comprises a memory and a processor, wherein the processor is used to execute a computer program stored in the memory to implement the method according to claim 1.

3. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to claim 1 is implemented.

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