A density-based mix design method for fluidized solidified soil

Abstract

This application discloses a density-based mix design method for fluidized solidified soil, comprising: determining the design density of the fluidized solidified soil; determining the water-to-solid ratio of the fluidized solidified soil based on fluidity requirements; determining the cement admixture ratio and curing agent admixture ratio of the fluidized solidified soil based on strength requirements; and obtaining the corresponding dosages of water, cement, curing agent, and wet soil. This application innovatively designs the mix proportion of fluidized solidified soil from a density perspective, effectively ensuring the rationality and accuracy of the density of the prepared fluidized solidified soil. This results in a density lower than that of the silt on the seabed in marine reclamation projects, thereby guaranteeing the construction quality of fluidized solidified soil reclamation projects.

Description

Technical Field

[0001] This application belongs to the field of marine pile foundation reinforcement engineering technology, and in particular relates to a density-based method for designing the mix proportion of fluidized solidified soil. Background Technology

[0002] Due to the erosive action of water currents, the seabed around offshore wind turbine foundations is subjected to intense scouring, forming scour pits. This significantly reduces the bearing capacity of the foundations, increases the overturning moment, and causes horizontal displacement of the wind turbine, posing a major safety hazard to the turbine foundations. Solidified soil protection technology, due to its abundant resources and low cost, has become the mainstream protection method for scour prevention of single piles and pile groups in offshore wind power projects in recent years.

[0003] Due to the unique nature of offshore wind turbine foundation scour prevention construction, and to avoid excessively high solidified soil density that could cause seabed silt to be stirred up during the backfilling process, the density of the solidified soil has become a key factor in its design. The density of seabed silt is generally between 1500-1800 kg / m³. 3 To ensure the quality of the solidified soil filling construction, the density of the prepared fluidized solidified soil needs to be less than 1500 kg / m³. 3 However, the existing mix design process for solidified soil does not take density into account, resulting in the density of the prepared solidified soil fluctuating within a large range, making it difficult to guarantee the construction quality of solidified soil backfill projects. Summary of the Invention

[0004] In view of the shortcomings or deficiencies of the prior art, the technical problem to be solved by this application is to provide a density-based design method for the mix proportion of fluidized solidified soil.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] This application proposes a density-based mix design method for fluidized solidified soil, including:

[0007] Determine the design density of the fluidized solidified soil;

[0008] Based on fluidity requirements, the water-to-solid ratio of the fluidized solidified soil is determined;

[0009] Based on strength requirements, the cement admixture ratio and curing agent admixture ratio of the fluidized solidified soil are determined;

[0010] Obtain the appropriate amounts of water, cement, curing agent, and wet soil.

[0011] Optionally, in the above-mentioned density-based mix design method for fluidized solidified soil, the design density ρ of the fluidized solidified soil is used as the basis for the mix design. 设Water-to-solid ratio r, cement admixture ratio r 水泥 The amount of cement in each cubic meter of solidified soil is obtained (m). 水泥 .

[0012] Optionally, in the above-mentioned density-based design method for the mix proportioning of fluidized solidified soil, wherein,

[0013] Optionally, in the above-mentioned density-based mix design method for fluidized solidified soil, the design density ρ of the fluidized solidified soil is used as the basis for the mix design. 设 Water-to-solid ratio r, curing agent incorporation ratio r 固化剂 The amount of cement in each cubic meter of solidified soil is obtained (m). 固化剂 .

[0014] Optionally, in the above-mentioned density-based design method for the mix proportioning of fluidized solidified soil, wherein,

[0015] Optionally, in the above-mentioned density-based mix design method for fluidized solidified soil, the design density ρ of the fluidized solidified soil is used as the basis for the mix design. 设 Water-to-solid ratio r, curing agent incorporation ratio r 固化剂 Cement admixture ratio r 水泥 The moisture content r of wet soil 湿土含水 The amount of wet soil in each cubic meter of solidified soil is obtained (m). 水 .

[0016] Optionally, in the above-mentioned density-based design method for the mix proportioning of fluidized solidified soil, wherein,

[0017] Optionally, in the above-mentioned density-based mix design method for fluidized solidified soil, the design density ρ of the fluidized solidified soil is used as the basis for the mix design. 设 Cement admixture content m 水泥 The addition of curing agent m 固化剂 The amount of wet soil added (m) 湿土 The water content (m) in each cubic meter of solidified soil was obtained. 水 .

[0018] Optionally, in the above-mentioned density-based design method for the mix proportioning of fluidized solidified soil, m 水 =ρ 设 ×1-m 水泥 -m 固化剂 -m 湿土 .

[0019] Optionally, in the above-mentioned density-based design method for the mix proportion of fluidized solidified soil, the water-to-solid ratio of the fluidized solidified soil is between 0.5 and 0.7; further, the water-to-solid ratio of the fluidized solidified soil is between 0.5 and 0.6.

[0020] Optionally, in the above-described density-based design method for the mix proportion of fluidized solidified soil, the cement content of the fluidized solidified soil is between 7% and 15%; further, the cement content of the fluidized solidified soil is between 7% and 14%; further, the cement content of the fluidized solidified soil is between 7% and 13%; further, the cement content of the fluidized solidified soil is between 7% and 12%; further, the cement content of the fluidized solidified soil is between 7% and 11%; further, the cement content of the fluidized solidified soil is between 7% and 10%; further, the cement content of the fluidized solidified soil is between 7% and 9%; further, the cement content of the fluidized solidified soil is between 7% and 8%.

[0021] Optionally, in the above-mentioned density-based design method for the mix proportion of fluidized solidified soil, the curing agent incorporation ratio of the fluidized solidified soil is between 2% and 5%; further, the curing agent incorporation ratio of the fluidized solidified soil is between 2% and 4%; further, the curing agent incorporation ratio of the fluidized solidified soil is between 3% and 4%.

[0022] Compared with the prior art, this application has the following technical effects:

[0023] This application innovatively designs the mix proportion of fluidized solidified soil from the perspective of density, which can effectively ensure the rationality and accuracy of the density of the prepared fluidized solidified soil. This results in the density of the prepared fluidized solidified soil being lower than the density of the silt on the seabed surface of the marine reclamation project, thereby ensuring the construction quality of the fluidized solidified soil reclamation project.

[0024] This application calculates the total mass of the solidified soil slurry per cubic meter based on the design density of the fluidized solidified soil, and then calculates the mass of dry material and water per cubic meter of solidified soil based on the water-to-solid ratio. Since the dry material mainly contains cement, curing agent, and dry soil, the dosage of cement, curing agent, and dry soil per cubic meter of solidified soil dry material can be calculated based on the cement and curing agent admixture ratios. However, in the construction process of solidified soil, wet soil is generally used for its preparation. Therefore, based on the calculated dry soil dosage per cubic meter of solidified soil and the moisture content of the wet soil used for preparation, the dosage of wet soil per cubic meter of solidified soil can be calculated. Therefore, subtracting the dosages of cement, curing agent, and wet soil from the total mass of each cubic meter of solidified soil yields the water dosage per cubic meter of solidified soil. Attached Figure Description

[0025] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1This application includes a flowchart of a density-based mix design method for fluidized solidified soil. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Example 1

[0029] A certain offshore pile foundation pit fluidized solidification soil reclamation project has a seabed silt density of 1500 kg / m³. 3 The wet soil used for foundation pit solidification backfill has a moisture content of 60%. To meet the construction requirements of fluidized solidified soil hydraulic filling projects, it needs to be formulated with a slump of not less than 180 mm, a 28-day unconfined compressive strength of not less than 400 kPa, and a density of not more than 1450 kg / m³. 3 fluidized solidified soil

[0030] See also Figure 1 As shown, the specific preparation method is as follows:

[0031] Step 1: Determine the density of the fluidized solidified soil to be prepared. Since the density of the fluidized solidified soil needs to be lower than that of the seabed silt, the designed density of the fluidized solidified soil is 1450 kg / m³. 3 ;

[0032] Step 2: Based on the slump index of the fluidized solidified soil, adapt the fluidized solidified soil under different water-solid ratio conditions. Based on the slump measurement results of the adapted fluidized solidified soil, set the water-solid ratio of the fluidized solidified soil to be 0.6.

[0033] Step 3: Based on the 28-day unconfined compressive strength index of the fluidized solidified soil, the fluidized solidified soil was adapted under different cement and curing agent dosages. Based on the strength test results, the cement content ratio of the fluidized solidified soil was set to 8%, and the curing agent content ratio was set to 2%.

[0034] Step 4: Calculate the cement content in each cubic meter of fluidized solidified soil, according to formula (1). The calculated cement content in each cubic meter of fluidized solidified soil is 72.5 kg;

[0035] Step 5: Calculate the amount of solidifying agent in each cubic meter of fluidized solidified soil, according to formula (2). The calculated amount of solidifying agent in each cubic meter of fluidized solidified soil is 18.1 kg;

[0036] Step 6: Calculate the amount of wet soil in each cubic meter of fluidized solidified soil, according to formula (3). The calculated amount of wet soil in each cubic meter of fluidized solidified soil is 1305 kg;

[0037] Step 7: Calculate the water content in each cubic meter of fluidized solidified soil, according to formula (4) m 水 =ρ 设 ×1-m 水泥 -m 固化剂 -m 湿土 The calculated water content in each cubic meter of fluidized solidified soil is 54.4 kg.

[0038] Therefore, according to the mix design method disclosed in this embodiment, the mix proportion of each cubic meter of fluidized solidified soil is 72.5:18.1:1305:54.4 kg for cement:solidifying agent:wet soil:water.

[0039] Example 2

[0040] A certain offshore pile foundation pit fluidized solidification soil reclamation project has a seabed silt density of 1550 kg / m³. 3 The wet soil used for foundation pit solidification backfill has a moisture content of 80%. To meet the construction requirements of fluidized solidified soil hydraulic filling projects, it needs to be formulated with a slump of not less than 200 mm, a 28-day unconfined compressive strength of not less than 400 kPa, and a density of not more than 1500 kg / m³. 3 Fluidized solidified soil.

[0041] See also Figure 1 As shown, the specific preparation method is as follows:

[0042] Step 1: Determine the density of the fluidized solidified soil to be prepared. Since the density of the fluidized solidified soil needs to be lower than that of the seabed silt, the density of the fluidized solidified soil is designed to be 1500 kg / m³. 3 ;

[0043] Step 2: Based on the slump index of the fluidized solidified soil, adapt the fluidized solidified soil under different water-to-solid ratio conditions. Based on the slump measurement results of the adapted fluidized solidified soil, set the water-to-solid ratio of the fluidized solidified soil to 0.7.

[0044] Step 3: Based on the 28-day unconfined compressive strength index of the fluidized solidified soil, the fluidized solidified soil was adapted under different cement and curing agent dosages. Based on the strength test results, the cement content ratio of the fluidized solidified soil was set to 10%, and the curing agent content ratio was set to 4%.

[0045] Step 4: Calculate the cement content in each cubic meter of fluidized solidified soil, according to formula (1). The calculated cement content in each cubic meter of fluidized solidified soil is 88.2 kg;

[0046] Step 5: Calculate the amount of solidifying agent in each cubic meter of fluidized solidified soil, according to formula (2). The calculated amount of solidifying agent in each cubic meter of fluidized solidified soil is 35.3 kg;

[0047] Step 6: Calculate the amount of wet soil in each cubic meter of fluidized solidified soil, according to formula (3). The calculated content of wet soil in each cubic meter of fluidized solidified soil is 1365.9 kg;

[0048] Step 7: Calculate the water content in each cubic meter of fluidized solidified soil, according to formula (4) m 水 =ρ 设 ×1-m 水泥 -m 固化剂 -m 湿土 The calculated water content in each cubic meter of fluidized solidified soil is 10.6 kg.

[0049] Therefore, according to the mix design method disclosed in this invention, the mix proportion of each cubic meter of fluidized solidified soil is 88.2:35.3:1365.9:10.6 kg for cement:solidifier:wet soil:water.

[0050] Example 3

[0051] A certain offshore pile foundation pit fluidized solidification soil reclamation project has a seabed silt density of 1600 kg / m³. 3 The wet soil used for foundation pit solidification backfill has a moisture content of 40%. To meet the construction requirements of fluidized solidified soil hydraulic filling projects, it needs to be formulated with a slump of not less than 170 mm, a 28-day unconfined compressive strength of not less than 400 kPa, and a density of not more than 1550 kg / m³. 3 Fluidized solidified soil.

[0052] See also Figure 1 As shown, the specific preparation method is as follows:

[0053] Step 1: Determine the density of the fluidized solidified soil to be prepared. Since the density of the fluidized solidified soil needs to be lower than that of the seabed silt, the designed density of the fluidized solidified soil is 1550 kg / m³. 3 ;

[0054] Step 2: Based on the slump index of the fluidized solidified soil, adapt the fluidized solidified soil to different water-solid ratios. Based on the slump measurement results of the adapted fluidized solidified soil, set the water-solid ratio of the fluidized solidified soil to 0.5.

[0055] Step 3: Based on the 28-day unconfined compressive strength index of the fluidized solidified soil, the fluidized solidified soil was adapted under different cement and curing agent dosages. Based on the strength test results, the cement content ratio of the fluidized solidified soil was set to 7%, and the curing agent content ratio was set to 3%.

[0056] Step 4: Calculate the cement content in each cubic meter of fluidized solidified soil, according to formula (1). The calculated cement content in each cubic meter of fluidized solidified soil is 72.3 kg;

[0057] Step 5: Calculate the amount of solidifying agent in each cubic meter of fluidized solidified soil, according to formula (2). The calculated amount of solidifying agent in each cubic meter of fluidized solidified soil is 31 kg;

[0058] Step 6: Calculate the amount of wet soil in each cubic meter of fluidized solidified soil, according to formula (3). The calculated amount of wet soil in each cubic meter of fluidized solidified soil is 1302 kg;

[0059] Step 7: Calculate the water content in each cubic meter of fluidized solidified soil, according to formula (4) m 水 =ρ 设 ×1-m 水泥 -m 固化钢 -m 湿土 The calculated water content in each cubic meter of fluidized solidified soil is 144.7 kg.

[0060] Therefore, according to the mix design method disclosed in this invention, the mix proportion of each cubic meter of fluidized solidified soil is 72.3:31:1302:144.7 kg for cement:solidifier:wet soil:water.

[0061] The properties of the fluidized solidified soil prepared in the three examples were measured and are shown in Table 1.

[0062] Table 1 Comparison of the performance of fluidized solidified soil in different embodiments

[0063]

[0064] As shown in Table 1, the density-based mix design method for fluidized solidified soil disclosed in this application has high density design accuracy and small error between the measured density value and the design value, which can fully ensure that the prepared fluidized solidified soil meets the engineering requirements.

[0065] This application innovatively designs the mix proportions of fluidized solidified soil from a density perspective, effectively ensuring the rationality and accuracy of the density of the prepared fluidized solidified soil. This results in a density lower than that of seabed silt in offshore reclamation projects, thereby guaranteeing the construction quality of fluidized solidified soil reclamation projects. Therefore, this application has broad market application prospects.

[0066] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. The preferred embodiments have been described in detail. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the claims of this application.

Claims

1. A method for designing a mixture ratio of a flow state solidified soil based on density design, characterized in that, It is used in offshore reclamation projects, including: Determine the design density of fluidized solidified soil ρ 设 , wherein the design density ρ 设 The density is set to be lower than that of the silt on the seabed surface of marine reclamation projects; Based on fluidity requirements, the water-to-solid ratio of the fluidized solidified soil is determined; Based on strength requirements, the cement admixture ratio and curing agent admixture ratio of the fluidized solidified soil are determined; Design density based on fluidized solidified soil ρ 设 Water-to-solid ratio r Cement admixture ratio r 水泥 To obtain the cement content in each cubic meter of solidified soil. m 水泥 ,in, Specifically, based on the slump index of the fluidized solidified soil, the fluidized solidified soil is adapted under different water-to-solid ratios to determine the water-to-solid ratio. r ; Design density based on fluidized solidified soil ρ 设 Water-to-solid ratio r Curing agent mixing ratio r 固化剂 To obtain the cement content in each cubic meter of solidified soil. m 固化剂 ,in, ; Design density based on fluidized solidified soil ρ 设 Water-to-solid ratio r Curing agent mixing ratio r 固化剂 Cement admixture ratio r 水泥 Moisture content of wet soil r 湿土含水 To obtain the amount of wet soil admixture in each cubic meter of solidified soil. m 湿土 ,in, ; Among them, the design density based on fluidized solidified soil ρ 设 Water-to-solid ratio r Curing agent mixing ratio r 固化剂 Cement admixture ratio r 水泥 Moisture content of wet soil r 湿土含水 To obtain the amount of wet soil admixture in each cubic meter of solidified soil. m 水 To obtain the water content in each cubic meter of solidified soil. m 水 for: 。 2. The method for designing mix proportions of fluidized solidified soil based on density design according to claim 1, characterized in that, The water-to-solid ratio of the fluidized solidified soil is between 0.5 and 0.7; and / or, the cement content of the fluidized solidified soil is between 7% and 15%; and / or, the curing agent content of the fluidized solidified soil is between 2% and 5%.

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