A method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation

Abstract

The present invention provides a method for calculating the suction required for the installation of a single-barrel multi-compartment bucket foundation in sand, comprising: calculating the total friction resistance of the compartment plates and the bucket wall friction resistance F that the single-barrel multi-compartment bucket foundation is subjected to during the suction sinking stage of the installation process. w Calculate the end resistance Q of the barrel wall of a single barrel multi-compartment barrel foundation during the suction sinking stage of installation. w,tip and the total resistance of the partition plate end; according to the single barrel multi-compartment barrel foundation installation process, when the single barrel multi-compartment barrel foundation sinks at a uniform speed, the sum of all the resistances of the installation is equal to the penetration force provided by the suction, and combined with the total friction resistance of the partition plate and the barrel wall friction resistance F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip Calculate the suction required for the installation of a single-bucket multi-compartment bucket foundation; adjust the compartment type of the single-bucket multi-compartment bucket foundation based on the suction required for the installation of the single-bucket multi-compartment bucket foundation. This application realizes the calculation of the suction required during the installation of a single-bucket multi-compartment bucket foundation suitable for sandy soil, which is convenient for calculation.

Description

Technical Field

[0001] The present invention relates to the technical field of bucket foundations, and in particular to a method for calculating suction required for installation of a single-bucket multi-compartment bucket foundation in sandy soil. Background Art

[0002] The single-barrel, multi-compartment bucket foundation is one of the foundation types that has been used in offshore wind power in recent years. Compared to the single-barrel bucket foundation, the single-barrel, multi-compartment bucket foundation can control the foundation inclination by changing the suction of the side and middle compartments. During the suction sinking phase of the single-barrel, multi-compartment bucket foundation, the subdivision plates change the seepage field state within the sinking range. During the suction sinking phase, the seepage changes the original stress state of the soil. As the suction of the middle compartment decreases, the seepage state of the inner wall of the middle compartment plate changes from upward to downward, causing the vertical effective stress of the soil near the inner wall of the subdivision plate in the middle compartment to change from decreasing to increasing, thereby causing the lateral friction resistance to change from decreasing to increasing. Currently, during the leveling process of the single-barrel, multi-compartment bucket foundation, the suction required when the tank pressure is lower than that of the side tanks is inconvenient to calculate. Therefore, calculating the required suction when the tank pressure is lower than that of the side tanks during the leveling process of the bucket foundation is crucial for guiding construction. Summary of the Invention

[0003] The present application provides a method for calculating the suction required for the installation of a bucket foundation in sand, so as to at least solve the problem in the related art of the inconvenience of calculating the suction required when the cabin pressure is lower than the side cabin during the leveling process of the bucket foundation installation.

[0004] The first embodiment of the present application provides a method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation in sandy soil, including:

[0005] Calculate the total friction resistance of the compartment plates and the barrel wall during the suction sinking stage of the single barrel multi-compartment barrel foundation installation process F w ;

[0006] Calculate the end resistance Q of the barrel wall of a single barrel multi-compartment barrel foundation during the suction sinking stage of installation. w,tip and total resistance at the subdivision plate ends;

[0007] According to the total friction resistance of the partition plate and the friction resistance of the barrel wall F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip Calculate the suction required for installation of a single-barrel, multi-compartment barrel foundation;

[0008] According to the suction required for the installation of the single-barrel multi-compartment barrel foundation, the compartment type of the single-barrel multi-compartment barrel foundation is adjusted.

[0009] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0010] The present invention provides a method for calculating the suction required for the installation of a single-barrel multi-compartment bucket foundation in sand, including: calculating the total friction resistance of the compartment plate and the bucket wall friction resistance of the single-barrel multi-compartment bucket foundation during the suction sinking stage of the installation process. F w Calculate the end resistance Q of the barrel wall of a single barrel multi-compartment barrel foundation during the suction sinking stage of installation. w,tip and the total resistance of the partition plate end; according to the single barrel multi-compartment barrel foundation installation process, when the single barrel multi-compartment barrel foundation sinks at a uniform speed, the sum of all the resistances of the installation is equal to the penetration force provided by the suction, and combined with the total friction resistance of the partition plate and the barrel wall friction resistance F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip The static equilibrium equation of a single-barrel multi-compartment bucket foundation during sinking is obtained and the suction force required for installation of the single-barrel multi-compartment bucket foundation is calculated. This application realizes the calculation of the suction force required when the tank pressure is less than the side tank during the leveling process of a single-barrel multi-compartment bucket foundation in sand, which is convenient for calculation.

[0011] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0013] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0014] Figure 1 This is a flow chart of a method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation in sandy soil, provided by an embodiment of the present disclosure;

[0015] Figure 2 This is a structural schematic diagram of a single-bucket multi-compartment bucket foundation in sand provided by an embodiment of the present disclosure, in a method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation;

[0016] Figure 3 yes Figure 2 Split diagram of the single barrel multi-compartment barrel foundation;

[0017] Figure 4 This is a schematic diagram of the installation process of a single-bucket multi-compartment bucket foundation in sand provided by an embodiment of the present disclosure, in a method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation;

[0018] Figure 5 The present invention provides a method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation in sandy soil. L pc Schematic diagram of changes with relative sinking depth;

[0019] Figure 6 The present invention provides a method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation in sandy soil. L pw Schematic diagram of changes with relative sinking depth;

[0020] Figure 7 This is a comparison chart of the required negative pressure and the measured negative pressure in a method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation in sand provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0022] This application proposes a method for calculating the suction required for the installation of a single-bucket multi-compartment bucket foundation in sand, including: calculating the total friction resistance of the compartment plate and the bucket wall friction resistance of the single-bucket multi-compartment bucket foundation during the suction sinking stage of the installation process. F w Calculate the end resistance Q of the barrel wall of a single barrel multi-compartment barrel foundation during the suction sinking stage of installation. w,tip and the total resistance of the partition plate end; according to the single barrel multi-compartment barrel foundation installation process, when the single barrel multi-compartment barrel foundation sinks at a uniform speed, the sum of all the resistances of the installation is equal to the penetration force provided by the suction, and combined with the total friction resistance of the partition plate and the barrel wall friction resistance F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip Calculate the suction required for the installation of a single-barrel, multi-compartment bucket foundation; adjust the compartment type of the single-barrel, multi-compartment bucket foundation based on the suction required for installation. This application implements the calculation of the required suction when the tank pressure is less than the side tank during the leveling process of a single-barrel, multi-compartment bucket foundation in sandy soil, making the calculation convenient.

[0023] See also Figures 1 to 3The single-barrel multi-compartment barrel foundation has a barrel wall, a partition plate and a barrel top cover. The partition plate includes a middle cabin partition plate and a side cabin partition plate. The barrel multi-compartment barrel foundation is provided with seven compartments in total, namely a middle cabin (7# cabin) and multiple side cabins (1# cabin to 6# cabin). The middle cabin is obtained by the middle cabin partition plate and the barrel top, and the multiple side cabins are separated by the side cabin partition plates. The single-barrel multi-compartment barrel foundation structure is an existing technology and will not be described in detail here.

[0024] The following describes, with reference to the accompanying drawings, a method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation in sandy soil according to an embodiment of the present application.

[0025] Example 1

[0026] Figure 1 A flowchart of a method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation in sand provided by an embodiment of the present disclosure is provided. Figure 1 Said method comprises:

[0027] Step 1: Calculate the total friction resistance of the compartment plates and the barrel wall during the suction sinking stage of the single barrel multi-compartment barrel foundation installation process F w .

[0028] In the embodiment of the present disclosure, the total friction resistance of the partition plate includes: the friction resistance of the middle cabin partition plate F c and friction resistance of the side tank partition plate F b ;

[0029] The friction resistance of the mid-cabin partition plate F c Including the friction resistance of the inner wall of the middle cabin partition and the outer wall friction resistance of the middle cabin partition .

[0030] Figure 4 A schematic diagram of the installation process of a single-bucket multi-compartment bucket foundation in sand provided by an embodiment of the present disclosure, as shown in the suction calculation method required for the installation of a single-bucket multi-compartment bucket foundation in sand. Figure 4As shown in the figure, a single-barrel multi-compartment barrel foundation has multiple excess pore pressure measurement points, namely, A, B, C, D, E, F, G, and H. Specifically, points B and D represent points on the inner wall and outer wall of the subdivision plate end at the penetration depth of the subdivision plate (the end of the subdivision plate), respectively. Points A and C represent points on the inner wall and outer wall of the subdivision plate at the soil surface of the subdivision plate, respectively. Points F and H represent points on the inner wall and outer wall of the barrel wall at the penetration depth of the barrel wall (the end of the barrel wall), respectively. Points E and G represent points on the inner wall and outer wall of the barrel wall at the soil surface of the barrel wall, respectively. The excess pore pressure values ​​of points A to H are obtained by finite element calculation, and then the resistance is calculated.

[0031] The calculation of the total friction resistance of the compartment plate and the barrel wall friction resistance of the single barrel multi-compartment barrel foundation during the suction sinking stage during the installation process F w ,include:

[0032] A1: Based on the floating density of sand , Single bucket multi-chamber bucket foundation burial depth h, 1# cabin suction , the excess pore pressure at point A caused by the suction in the barrel p A ', the excess pore pressure at point B caused by the suction in the barrel p B ', the excess pore pressure at point C caused by the suction in the barrel , the excess pore pressure at point D caused by the suction in the barrel p D ', lateral earth pressure coefficient K , middle cabin-soil external friction angle δ , middle cabin inner diameter d i And the inner diameter of the barrel wall D i Calculate the friction resistance of the inner wall of the middle cabin partition , the friction resistance of the outer wall of the middle cabin partition and friction resistance of the side tank partition plates F b ;

[0033] Furthermore, during the suction sinking stage of the single-barrel multi-compartment bucket foundation, the seepage changes the original stress state of the soil, and as the suction of the middle compartment decreases, the seepage state of the inner wall of the middle compartment partition changes from upward to downward, causing the vertical effective stress of the soil near the inner wall of the middle compartment partition to change from decreasing to increasing, thereby causing the lateral friction resistance to change from decreasing to increasing. The single-barrel multi-compartment bucket foundation in this embodiment is a single-barrel multi-compartment bucket foundation commonly used in engineering. The outer diameter of the middle compartment is d o and barrel wall outer diameter D o The calculation relationship isd o / D o =0.5; Assuming that the excess pore water pressure on the inner and outer walls of the middle cabin subdivision plate varies linearly along the depth direction, the friction resistance of the inner wall of the subdivision plate under the action of seepage is considered. The calculation formula is as follows:

[0034] (1)

[0035] Friction resistance of the outer wall of the subdivision plate under seepage The calculation formula is as follows:

[0036] ; (2)

[0037] Where, is the floating density of sand; h is the depth of single-bucket multi-compartment bucket foundation embedded in the soil; p A ' is the excess pore pressure at point A caused by the suction in the barrel; p B ' is the excess pore pressure at point B caused by the suction in the barrel; is the excess pore pressure at point C caused by the suction in the barrel, p D ' is the excess pore pressure at point D caused by the suction in the barrel; d o is the outer diameter of the middle cabin; is the inner diameter of the middle cabin; δ is the middle cabin-soil external friction angle; It is the suction force in cabin 1#.

[0038] A2: According to the friction resistance of the inner wall of the middle cabin partition plate and the outer wall friction resistance of the middle cabin partition plate Get the friction resistance of the middle cabin partition plate F c The calculation formula of the friction resistance of the middle cabin subdivision plate is as follows:

[0039] F c = + ; (3)

[0040] Since the barrel diameter of the middle tank is much larger than the wall thickness of the middle tank partition, it can be approximately considered that d i ≈ d o ≈ d , d is the radius of the mid-cabin, d =d i / 2+d o / 2, combined with the middle cabin diameter d , put formula (1) and formula (2) into formula (3) to obtain the friction resistance of the middle cabin partition plate F c The calculation formula is as follows:

[0041] ; (4)

[0042] See also Figure 5 , L pc = p B '- p A '+ p D '- p C ', according to the finite element calculation results, different cabin pressure ratios are obtained η Under working conditions L pc With relative sinking depth h / D o The changing rules are as follows Figure 5 As shown, D o is the outer diameter of the barrel wall, and is obtained through data analysis L pc The approximate calculation formula is L pc The approximate calculation formula is as follows:

[0043] . (5)

[0044] A3: Excess pore pressure at point F caused by suction in the barrel p F ', the excess pore pressure at point E caused by the suction in the barrel p E ', Excess pore pressure at point H caused by suction in the barrel p H ', the excess pore pressure at point G caused by the suction in the barrel p G '、Calculate the friction resistance of the barrel wall by the barrel wall diameter D F w .

[0045] Furthermore, it can be approximated that d i ≈ d o ≈ d , d is the middle cabin diameter, d=d i / 2+ d o / 2, and the friction resistance of the barrel wall is obtained F w The calculation formula of the barrel wall friction resistance is F w The calculation formula is as follows:

[0046] ; (6)

[0047] Where D is the barrel wall diameter, D=D i / 2+ D o / 2, D i is the inner diameter of the barrel wall, D o is the outer diameter of the barrel wall.

[0048] See also Figure 6 ,make L pw = p F '- p E '+ p H '- p G ', according to the finite element calculation results, different cabin pressure ratios are obtained η Under working conditions L pw With relative sinking depth h / D o The changing rules are as follows Figure 6 In addition, through data analysis, we can get L pw The approximate calculation formula is L pw The approximate calculation formula is as follows:

[0049] (7)

[0050] The cabin pressure ratio is defined as η The pressure of cabin 7# ( ) and 1# cabin pressure ( ) ratio, that is η= .

[0051] It should be noted that Figure 5 and Figure 6 The points in the figure are the finite element calculation results, and the solid lines are the calculation results of formula (6) and formula (7), which are basically consistent. Lpc and L pw A positive value indicates that the seepage effect caused by suction reduces the vertical effective stress of the soil and the lateral friction resistance is reduced. Figure 5 and Figure 6 It can be seen that with the decrease of cabin pressure ratio, the drag reduction degree of the middle cabin partition plate friction resistance decreases, the drag reduction degree of the barrel wall friction resistance increases, and the middle cabin partition plate friction resistance is affected. η The impact is greater.

[0052] The pressure between the side tanks is the same, that is, the pressure of the 1# tank to the 6# tank is the same, and there is no seepage between the side tanks. Therefore, the side tank partition plate is not affected by the seepage. The friction resistance of the side tank partition plate is F b The calculation formula is as follows:

[0053] . (8)

[0054] Step 2: Calculate the end resistance Q of the barrel wall during the suction sinking stage of the single barrel multi-compartment barrel foundation installation process w,tip and the total resistance at the subdivision plate ends.

[0055] In the embodiment of the present disclosure, the total resistance of the subdivision panel end includes the resistance Q of the middle cabin subdivision panel end. c,tip and side tank subdivision plate end resistance .

[0056] It should be noted that the calculation of the barrel wall end resistance Q of the single barrel multi-compartment barrel foundation during the suction sinking stage of the installation process is w,tip And the total resistance of the subdivision plate end also includes:

[0057] Calculate the total end resistance of a single barrel multi-compartment barrel foundation during the self-weight sinking stage Q tip The total end resistance of the single barrel multi-compartment barrel foundation during the self-weight sinking stage is Q tip The calculation formula is as follows:

[0058] (9)

[0059] Wherein, the first bearing capacity coefficient N q The calculation formula is as follows:

[0060] (10)

[0061] The second bearing capacity coefficient N γ The calculation formula is as follows:

[0062] (11)

[0063] Where, is the internal friction angle of sand.

[0064] The calculation of the barrel wall end resistance Q of the single barrel multi-compartment barrel foundation during the suction sinking stage of the installation process is as follows: w,tip and the total resistance at the subdivision plate end, including:

[0065] F1: Based on the first bearing capacity factor N q , the second bearing capacity coefficient N γ Floating density of sand , wall thickness t, barrel wall inner diameter D i , outer diameter of middle tank d o , Single barrel multi-compartment barrel foundation burying depth to obtain the side tank compartment plate end resistance ;

[0066] The side tanks are not affected by seepage, and the side tank subdivision plate end resistance The calculation formula is as follows:

[0067] ; (12)

[0068] F2: Based on the floating density of sand , the first bearing capacity coefficient N q , the second bearing capacity coefficient N γ , wall thickness t, and the average overburden effective pressure at the end of the middle cabin subdivision plate under seepage Calculate the mid-tank subdivision plate end resistance Q c,tip and the barrel wall end resistance Q under the action of seepage w,tip ;

[0069] G1: During the suction sinking stage, the seepage changes the stress state of the soil at the end of the middle cabin partition plate and the end of the barrel wall. Assuming that the vertical effective stress of the soil at the end of the middle cabin partition plate changes linearly from the inside to the outside, the average overburden effective pressure at the end of the middle cabin partition plate under the action of seepage can be obtained. And considering the effective bulk density of soil γ ' * ;

[0070] The average overlying effective pressure at the end of the middle cabin subdivision plate under the seepage effect The calculation formula is as follows:

[0071] (13)

[0072] The effective bulk density of soil under seepage effect γ ' * The calculation formula is as follows:

[0073] (14)

[0074] Where, = ;

[0075] G2: Average effective pressure on the end of the middle compartment subdivision plate under seepage and seepage effect soil effective density γ ' * Calculation of the end resistance Q of the mid-tank subdivision plate of a single-tank multi-tank barrel foundation c,tip and barrel wall resistance Q w,tip ;

[0076] Combining formula (12), formula (13) and formula (14) we can get the mid-tank subdivision plate end resistance Q c,tip The calculation formula of the middle cabin subdivision plate end resistance Q c,tip The calculation formula is as follows:

[0077] ; (15)

[0078] Where, N q The first bearing capacity coefficient, N γ second bearing capacity coefficient; q is the effective pressure on the barrel end; t is the wall thickness;

[0079] The resistance Q of the barrel wall under the seepage effect of the barrel end w,tip The calculation formula is as follows:

[0080] ; (16)

[0081] Where, L pw = p F '- p E '+ p H '- p G .

[0082] F3: According to the mid-tank subdivision plate end resistance Q c,tip and side tank subdivision plate end resistance The total resistance of the subdivision panel end is obtained, which is equal to the resistance of the middle cabin subdivision panel end Q c,tip and side tank subdivision plate end resistance sum.

[0083] Step 3: According to the installation process of the single barrel multi-compartment barrel foundation, when the single barrel multi-compartment barrel foundation is uniformly sunk, the sum of all the resistances is equal to the penetration force provided by the suction force, and combined with the total friction resistance of the compartment plate and the barrel wall friction resistance F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip Calculate the suction required for installation of a single-bucket, multi-compartment bucket foundation.

[0084] In the embodiment of the present disclosure, according to the single barrel multi-compartment barrel type foundation installation process, when the single barrel multi-compartment barrel type foundation is uniformly sunk, the sum of all the resistances of the installation is equal to the penetration force provided by the suction force, and combined with the total friction resistance of the compartment plate and the barrel wall friction resistance F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip Calculate the suction required for installation of a single-bucket multi-compartment bucket foundation, including:

[0085] Q1: During the installation process of a single-barrel multi-compartment barrel foundation, when it sinks at a uniform speed, the sum of all the resistances during the installation of the single-barrel multi-compartment barrel foundation is equal to the penetration force provided by the suction force, combined with the total friction resistance of the compartment plate and the barrel wall friction resistance. F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip The static equilibrium equation of the single-bucket multi-compartment bucket foundation during sinking was calculated;

[0086] The static equilibrium equation is calculated as follows:

[0087] ; (17)

[0088] Where, The basic underwater weight of a single barrel with multiple compartments. is the cabin pressure ratio, s req Suction is required to sink a single-barrel, multi-compartment barrel foundation;

[0089] Q2: The total friction resistance of the partition plate and the friction resistance of the barrel wall F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip Substitute the calculation formula into the static equilibrium equation to obtain the suction force required for sinking a single-barrel multi-compartment barrel foundation. s req .

[0090] Furthermore, by substituting formula (4), formula (6), formula (8), formula (12), formula (15), and formula (16) into formula (17) and simplifying formula (17), the suction force required for sinking a single-bucket multi-compartment bucket foundation is obtained. s req ;

[0091] The sinking of the single-barrel multi-chamber barrel foundation requires suction s req The calculation formula is as follows:

[0092] ; (18)

[0093] Where, ; ; .

[0094] It should be noted that, when using formula (18) to calculate d o / D o = 0.5 single barrel multi-compartment barrel foundation requires suction, the only parameters that need to be determined are K tan δ , sinking depth h , barrel foundation diameter D , wall thickness t and cabin pressure ratio η , that is, the parameters used in the calculation are relatively easy to determine and have strong practicality. In addition, for any d o / D o The single-bucket multi-compartment bucket foundation can use this application method to deduce the required suction value.

[0095] In particular, the above calculation method needs to be verified. Based on the above established method for calculating the required negative pressure, the required negative pressure calculation was carried out on the existing single barrel multi-compartment barrel foundation leveling and sinking case and compared with the measured results to verify the applicability of this method. For example, in the calculation of the barrel foundation diameter D o =3.5m, barrel wall height H =0.9m, thickness of barrel wall and compartment plate t =8mm, the installation of a single barrel multi-compartment barrel foundation with a barrel weight of 28kN requires suction. During the sinking process of the single barrel multi-compartment barrel foundation, the pressure changes in the tank and side tank are as follows: Figure 7 As shown, Figure 7 As shown in the figure, it can be seen that during the foundation sinking depth of 0~0.5m, the tank pressure changes from 0~-2kPa, the average tank pressure of the side tank is 0~-6kPa, and the tank pressure ratio η =0.2~0.5, the pressure of each side tank is slightly different, here the side tank pressure is calculated by taking the average value. η Take 0.3, the calculated results and the measured results are as follows Figure 7 As shown, verification is performed.

[0096] Step 4: According to the suction required for the installation of the single-barrel multi-compartment barrel foundation, control the compartment type of the single-barrel multi-compartment barrel foundation.

[0097] In summary, the present invention provides a method for calculating the suction required for the installation of a single-bucket multi-compartment bucket foundation in sand, including: calculating the total friction resistance of the compartment plate and the bucket wall friction resistance of the single-bucket multi-compartment bucket foundation during the suction sinking stage of the installation process. F w Calculate the end resistance Q of the barrel wall of a single barrel multi-compartment barrel foundation during the suction sinking stage of installation. w,tip and the total resistance of the partition plate end; according to the total friction resistance of the partition plate, the friction resistance of the barrel wall F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip The static equilibrium equation of a single-bucket multi-compartment bucket foundation during sinking is obtained and the suction required for installation of the single-bucket multi-compartment bucket foundation is calculated. This application realizes the calculation of the suction required when the tank pressure is less than the side tank during the leveling process of a single-bucket multi-compartment bucket foundation in sand, which is convenient for calculation.

[0098] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0099] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0100] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for calculating the suction required for installation of a single-bucket multi-compartment bucket foundation in sandy soil, characterized in that: The method comprises: Calculate the total friction resistance of the compartment plates and the barrel wall during the suction sinking stage of the single barrel multi-compartment barrel foundation installation process F w ; Calculate the end resistance Q of the barrel wall of a single barrel multi-compartment barrel foundation during the suction sinking stage of installation. w,tip and total resistance at the subdivision plate ends; According to the installation process of the single barrel multi-compartment barrel foundation, when the single barrel multi-compartment barrel foundation is uniformly sunk, the sum of all the resistances is equal to the penetration force provided by the suction force, and combined with the total friction resistance of the compartment plate and the barrel wall friction resistance F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip Calculate the suction required for installation of a single-barrel, multi-compartment barrel foundation; According to the suction required for the installation of a single-barrel multi-compartment barrel foundation, the compartment type of the single-barrel multi-compartment barrel foundation is controlled; During the installation process of the single-barrel multi-compartment barrel foundation, when the single-barrel multi-compartment barrel foundation is installed at a uniform speed, the sum of all the resistances is equal to the penetration force provided by the suction force, combined with the total friction resistance of the compartment plate and the barrel wall friction resistance. F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip The static equilibrium equation of the single-bucket multi-compartment bucket foundation during sinking was calculated; The total friction resistance of the partition plate and the friction resistance of the barrel wall F w , total resistance at the compartment plate end, resistance at the barrel wall end Q w,tip Substitute the calculation formula into the static equilibrium equation to obtain the suction force required for sinking a single-barrel multi-compartment barrel foundation. s req； The static equilibrium equation is calculated as follows: ； Where, The basic underwater weight of a single barrel with multiple compartments. is the cabin pressure ratio, s req Suction is required to sink a single-barrel, multi-compartment barrel foundation; The suction required for sinking the single-bucket multi-compartment bucket foundation is obtained by simplifying the static balance equation. s req The calculation formula is as follows: ； Where, , , , is the floating density of sand, h is the depth of the single-bucket multi-compartment bucket foundation into the soil, d is the diameter of the middle compartment, d o is the outer diameter of the middle cabin, d i is the inner diameter of the middle cabin, K is the lateral earth pressure coefficient, δ is the middle cabin-soil external friction angle, η is the cabin pressure ratio, D i is the inner diameter of the barrel wall, t is the wall thickness, Nγ is the second bearing capacity coefficient, It is the basic underwater weight of a single barrel multi-compartment barrel.

2. The method according to claim 1, wherein The total friction resistance of the partition panels includes: F c and friction resistance of the side tank partition plate F b ; The friction resistance of the middle cabin partition plate F c Including the friction resistance of the inner wall of the middle cabin partition and the outer wall friction resistance of the middle cabin partition ; The total resistance of the subdivision panel end includes the resistance of the middle cabin subdivision panel end Q c,tip and side tank subdivision plate end resistance .

3. The method according to claim 1, wherein Calculate the total friction resistance of the compartment plates and the barrel wall during the suction sinking stage of the single barrel multi-compartment barrel foundation installation process F w ,include: The single-barrel multi-compartment barrel foundation has multiple excess pore pressure measurement points, namely, point A, point B, point C, point D, point E, point F, and point G. Specifically, point B and point D represent points on the inner wall of the end of the subdivision plate and the outer wall of the subdivision plate at the penetration depth of the subdivision plate, respectively. Point A and point C represent points on the inner wall of the subdivision plate and the outer wall of the subdivision plate at the soil surface position of the subdivision plate, respectively. Point F and point H represent points on the inner wall of the barrel wall and the outer wall of the barrel wall at the penetration depth of the barrel wall, respectively. Point E and point G represent points on the inner wall of the barrel wall and the outer wall of the barrel wall at the soil surface position of the barrel wall, respectively. A1: Based on the floating density of sand , Single bucket multi-compartment bucket foundation burial depth h, Side tank internal suction , the excess pore pressure at point A caused by the suction in the barrel p A ', the excess pore pressure at point B caused by the suction in the barrel p B ', the excess pore pressure at point C caused by the suction in the barrel , the excess pore pressure at point D caused by the suction in the barrel p D ', lateral earth pressure coefficient K , middle cabin-soil external friction angle δ , middle cabin inner diameter d i And the inner diameter of the barrel wall D i Calculate the friction resistance of the inner wall of the middle cabin partition , the friction resistance of the outer wall of the middle cabin partition and friction resistance of the side tank partition plates F b ; A2: According to the friction resistance of the inner wall of the middle cabin partition plate and the outer wall friction resistance of the middle cabin partition plate Get the friction resistance of the middle cabin partition plate F c , the friction resistance of the middle cabin partition plate F c = + ; A3: Excess pore pressure at point F caused by suction in the barrel p F ', the excess pore pressure at point E caused by the suction in the barrel p E ', Excess pore pressure at point H caused by suction in the barrel p H ', the excess pore pressure at point G caused by the suction in the barrel p G '、Calculate the friction resistance of the barrel wall by the barrel wall radius D F w .

4. The method according to claim 3, wherein , the friction resistance of the middle cabin partition plate F c The calculation formula is as follows: ； Where, d is the middle cabin diameter, d=d i / 2+ d o / 2,L pc =p B '-p A '+p D '-p C ', p A '、p B '、p C '、p D ' is the excess pore pressure at points A, B, C, and D caused by the suction in the cylinder; Friction resistance of the side tank subdivision plate F b The calculation formula is as follows: The barrel wall friction F w The calculation formula is as follows: ； Where D is the barrel wall diameter, D=D i / 2+ D o / 2, D i is the inner diameter of the barrel wall, D o is the outer diameter of the barrel wall, L pw =p F '-p E '+p H '-p G ', p F '、p E '、p H '、p G ' is the excess pore pressure at points E, F, G, and H caused by the suction in the cylinder; L pc and L pw A positive value indicates that the seepage effect caused by suction reduces the vertical effective stress of the soil.

5. The method according to claim 1, wherein Middle cabin outer diameter d o and barrel wall outer diameter D o The calculation relationship is as follows: d o / D o =0.5。 6. The method according to claim 1, wherein Calculate the end resistance Q of the barrel wall of a single barrel multi-compartment barrel foundation during the suction sinking stage of installation. w,tip and the total resistance at the subdivision plate end, including: Based on the first bearing capacity factor N q , the second bearing capacity coefficient N γ Floating density of sand , wall thickness t, barrel wall inner diameter D i , outer diameter of the middle cabin d o , Single barrel multi-compartment barrel foundation burying depth to obtain the side tank compartment plate end resistance ; Based on the floating density of sand , the first bearing capacity coefficient N q , the second bearing capacity coefficient N γ , wall thickness t, and the average overburden effective pressure at the end of the middle cabin subdivision plate under seepage Calculate the mid-tank subdivision plate end resistance Q c,tip and the barrel wall resistance Q under seepage w,tip ; According to the mid-tank subdivision plate end resistance Q c,tip and side tank subdivision plate end resistance The total resistance of the subdivision panel end is obtained, which is equal to the resistance of the middle cabin subdivision panel end Q c,tip and side tank subdivision plate end resistance sum.

7. The method according to claim 6, wherein The side tank subdivision plate end resistance The calculation formula is as follows: 。 8. The method according to claim 6, wherein Based on the floating density of sand , the first bearing capacity coefficient N q , the second bearing capacity coefficient N γ , wall thickness t, and the average overburden effective pressure at the end of the middle cabin subdivision plate under seepage Calculate the mid-tank subdivision plate end resistance Q c,tip and the barrel wall resistance Q under seepage w,tip ,include: G1: Calculate the average overburden effective pressure at the end of the middle cabin subdivision plate under seepage and seepage effect soil effective density γ ' * ; The average overlying effective pressure at the end of the middle cabin subdivision plate under the seepage effect The calculation formula is as follows: The effective bulk density of soil under seepage effect γ ' * The calculation formula is as follows: Where, = ; G2: Average effective pressure on the end of the middle compartment subdivision plate under seepage and seepage effect soil effective density γ ' * Calculation of the end resistance Q of the mid-tank subdivision plate of a single-tank multi-tank barrel foundation c,tip and barrel wall resistance Q w,tip ; The mid-tank subdivision plate end resistance Q c,tip The calculation formula is as follows: ； Where, N q The first bearing capacity coefficient, N γ second bearing capacity coefficient; q is the effective pressure on the barrel end; t is the wall thickness; The barrel wall end resistance Q w,tip The calculation formula is as follows: ； Where, L pw = p F '- p E '+ p H '- p G .

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