Magnesium series grouting reinforcement slurry mix proportion design method

Abstract

The present application relates to the technical field of highway construction, and particularly relates to a magnesium-based grouting reinforcement slurry mix proportion design method, wherein three kinds of slurry with different cement mixing ratios are configured in the slurry mix proportion design process, and 2-4% of active magnesium oxide curing agent is added to each of the three kinds of slurry to carry out a comparative test, and the final design quality mix proportion is determined through comparison of the results after 28d standard curing. The present application has the following advantages: the incorporation of active magnesium oxide promotes the hydration reaction of cement, improves the early strength of the composite foundation, and promotes the construction progress; the active magnesium oxide-cement composite slurry can significantly increase the cohesion and internal friction angle mechanical parameters of the composite foundation soil, improve the roadbed bearing capacity, reduce the overall settlement of the roadbed, and ensure the stability of the composite foundation; the magnesium hydroxide crystals generated by the hydration reaction of active magnesium oxide produce expansion to compensate for the shrinkage caused by the hardening of cement.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of highway construction, in particular to a magnesium-based grouting reinforcement slurry mix proportion design method. BACKGROUND

[0002] The middle and lower reaches of the Yangtze River plain region is densely covered with lakes, and the water system is developed, and the underground water level is high; due to the impact and deposition of the river water, the soft silt layer is widely distributed in the river area, the soft silt layer has the characteristics of high underground water level, large burial depth, thick overburden layer, low bearing capacity and easy liquefaction.

[0003] Generally, the soft soil grouting treatment technology regards the soft soil as a solidified base material, solves the environmental pollution problem, and is a recognized technology which is feasible, environmentally friendly and high in economic benefit. The slurry mix proportion is an important influencing factor for controlling the reinforcement effect and economy of the highway soft foundation, therefore, the purpose of the cement-based grouting reinforcement slurry mix proportion design is to determine the slurry mix proportion which is good in reinforcement effect, strong in economy and environmentally friendly under the premise of meeting the existing specifications and technical parameters. SUMMARY

[0004] The application aims to provide a magnesium-based grouting reinforcement slurry mix proportion design method, and the technical problems solved by the application are that the slurry mix proportion which is good in reinforcement effect, strong in economy and environmentally friendly is determined under the premise of meeting the existing specifications and technical parameters.

[0005] The purpose of the application can be achieved by the following technical scheme:

[0006] A magnesium-based grouting reinforcement slurry mix proportion design method comprises the following steps:

[0007] The silty soil material of the original soil, cement and active magnesium oxide are taken as raw materials, the natural water content of the original silty soil is first determined, then the original soil is dried at a constant temperature of 60-70 DEG C for 6-8h, the dried soil is crushed and passed through a 0.5mm sieve to obtain dried soil, and the water content of the dried soil is measured;

[0008] Three different cement mixing ratios are determined, and the three different cement mixing ratios are 3-9% of the mass of the original soil;

[0009] The active magnesium oxide with a purity of not less than 95% is selected, and the mixing ratio of the active magnesium oxide is 2-4% of the mass of the cement; the slurry with three different cement mixing ratios is configured, and the slurry with the three different cement mixing ratios meets the flowability condition of the slurry;

[0010] In the process of preparing the slurry, the cement and the air-dried soil are uniformly mixed first, then the active magnesium oxide is uniformly stirred with water to prepare the cementing liquid, the cementing liquid is added once or gradually, the stirring is started from the time of adding the cementing liquid and is continued until uniform, the stirring time is not less than 5 min, after uniform stirring, the mixture is loaded into a test mold for molding to prepare the standard test sample;

[0011] The test sample is placed in a standard curing tank water according to the specification, and the slurry test sample with three different cement mixing ratios is subjected to three times of unconfined compression test and triaxial shear test at 7-28d age.

[0012] As a further scheme of the present application: the undisturbed soil, the cement and the active magnesium oxide are in a ratio of 100:3:3.

[0013] As a further scheme of the present application: the water-binder ratio is 1:1.

[0014] As a further scheme of the present application: the unconfined test sample is a cylindrical sample with a diameter of 39.1mm and a height of 80mm, and the triaxial test is a cylindrical sample with a diameter of 39.1mm and a height of 80mm.

[0015] As a further scheme of the present application: the test sample should be demolded after standing for 48h, the test piece is placed in a standard curing tank water, the spacing between the test pieces should be not less than 10mm, and the water surface should be not less than 20mm higher than the surface of the test piece.

[0016] As a further scheme of the present application: three kinds of slurry with different cement mixing ratios are configured, and the specific process is as follows:

[0017] The physical property data of the active magnesium oxide are obtained; wherein the physical property data include the particle size of the active magnesium oxide,

[0018] The particle size data of each group of active magnesium oxide samples are analyzed to obtain the total activity influence factor of the active magnesium oxide mixing;

[0019] Based on the total activity influence factor of the active magnesium oxide mixing, the compensation coefficient is calculated;

[0020] The compensation coefficient and the process preset stirring speed are multiplied to obtain the stirring speed increase.

[0021] As a further scheme of the present application: the proportion influence factor of the low-activity target of each group of active magnesium oxide samples is multiplied with the difference influence factor of the low-activity target to obtain the activity influence factor of each group of active magnesium oxide samples; then the activity influence factors of all groups of active magnesium oxide samples are averaged to obtain the activity influence factor of the active magnesium oxide sample; then the total activity influence factor of the active magnesium oxide mixing is calculated through a formula, and the formula is as follows:

[0022]

[0023] Wherein, XZ is the total active magnesium oxide incorporation activity influence factor, mz is the total mass of the incorporation active magnesium oxide, my is the total mass of each group of active magnesium oxide sample, Xy is the active magnesium oxide sample activity influence factor.

[0024] As a further scheme of the present application: the process for obtaining the influence factor of the low-activity target is:

[0025] The particle size data of each group of active magnesium oxide sample is subjected to feature recognition, and the active magnesium oxide target greater than the standard particle size is extracted, which is marked as a low-activity target, the active magnesium oxide target equal to the standard particle size is extracted, which is marked as a normal-activity target, and the active magnesium oxide target smaller than the standard particle size is extracted, which is marked as a high-activity target.

[0026] The particle size of the low-activity target, the normal-activity target and the high-activity target is counted, and the proportion influence factor of the low-activity target is obtained by formula calculation, and the formula is as follows:

[0027]

[0028] Wherein, formula (1), Xd is the influence factor of the low-activity target, a = 1, 2, …, i is the number of low-activity targets, wd i is the particle size of the i th low-activity target; b = 1, 2, …, j is the number of low-activity targets, wd j is the particle size of the j th normal-activity target; c = 1, 2, …, k is the number of low-activity targets, wd k is the particle size of the k th normal-activity target.

[0029] As a further scheme of the present application: the process for obtaining the difference influence factor of the low-activity target is:

[0030] The difference influence factor of the low-activity target is calculated by formula, and the formula is as follows:

[0031]

[0032] Wherein, formula (2), Xc is the difference influence factor of the low-activity target, a = 1, 2, …, i is the number of low-activity targets, wd i is the particle size of the i th low-activity target, and wdb is the standard particle size of the active magnesium oxide target.

[0033] As a further scheme of the present application: the process for obtaining the compensation coefficient is:

[0034] When the total active magnesium oxide incorporation activity factor is obtained, the compensation coefficient is calculated by formula, and the specific formula is as follows:

[0035]

[0036] Wherein, XM is the compensation coefficient, XZ is the total active magnesium oxide incorporation activity factor, mz is the total mass of the incorporated active magnesium oxide, and wdb is the standard particle size of the active magnesium oxide target.

[0037] The beneficial effects of the present application are:

[0038] The incorporation of the active magnesium oxide promotes the hydration reaction of the cement, improves the early strength of the composite foundation, and promotes the next construction process; the active magnesium oxide-cement composite slurry can significantly increase the cohesion and internal friction angle mechanical parameters of the composite foundation soil, improve the roadbed bearing capacity, reduce the overall settlement of the roadbed, and ensure the stability of the composite foundation; the magnesium hydroxide crystals generated by the hydration reaction of the active magnesium oxide compensate for the shrinkage caused by the hardening of the cement, solving the problem of associated voids caused by the cement slurry reinforced soft foundation; the active magnesium oxide-cement composite slurry and the reinforced body can form a high-strength overall composite foundation, which is significantly different from the traditional composite foundation replacement treatment, and has the advantages of environmental protection, no pollution, and saving construction period; the composite slurry has a wide source of raw materials and low price, has good economic benefits, and can save a large amount of engineering funds; the composite foundation formed by the slurry treatment of the soft foundation has high bearing capacity and can eliminate liquefaction, which can meet the requirements of highway foundation bearing capacity;

[0039] The present application controls the stirring speed by detecting the activity of the active magnesium oxide, judging the proportion of the effective active magnesium oxide mass, and the activity proportion of the active magnesium oxide, so that the adjusted stirring speed can increase the shear force on the active magnesium oxide, thereby improving the particle size of the active magnesium oxide, improving the activity of the active magnesium oxide, and finally meeting the requirements of cement fluidity for the mass and activity of the incorporated active magnesium oxide. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 It is a flow framework structure diagram of the present application;

[0042] Figure 2 This is a table of unconfined compressive strength of samples with an active magnesium oxide doping ratio of 2%;

[0043] Figure 3 This is a table of unconfined compressive strength of samples with an active magnesium oxide doping ratio of 3%;

[0044] Figure 4 This is a table of unconfined compressive strength of samples with an active magnesium oxide doping ratio of 4%;

[0045] Figure 5 This is a table of internal friction angle and cohesion values ​​after fitting the triaxial test. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0047] Example 1

[0048] like Figure 1 As shown in the figure, an embodiment of the present invention provides a method for designing the mix proportion of magnesium-based grouting reinforcement slurry, which includes the following steps:

[0049] A. Take the original silty soil material, cement, and active magnesium oxide as raw materials. First, determine the natural moisture content of the original silty soil. Then, dry the original soil at a constant temperature of 60-70℃ for 6-8 hours. After drying, crush the dried soil and pass it through a 0.5mm sieve to obtain air-dried soil. Measure the moisture content of the air-dried soil.

[0050] B. Determine three different cement admixture ratios, each of which is 3% of the original soil mass;

[0051] C. Select active magnesium oxide with a water-cement ratio of 1:1 and a purity of not less than 95% and an admixture ratio of 2% of the cement mass;

[0052] D. Prepare three different cement admixture ratios of slurry, all of which meet the condition of good slurry fluidity. In the slurry preparation process, first, mix cement and air-dried soil evenly. Then, stir active magnesium oxide and water evenly to prepare a gelling agent. The gelling agent can be added all at once or gradually. Stirring should begin from the time the gelling agent is added until it is uniform, with a stirring time of no less than 5 minutes. After uniform stirring, the mixture is poured into molds to form standard samples.

[0053] E. The sample is placed in the standard curing box water according to the specification requirements, and the slurry sample with three different cement mixing ratios is subjected to three unconfined compression tests and triaxial shear tests at 7d, 14d and 28d ages respectively;

[0054] F. According to the test results of the unconfined compression test and the triaxial shear test, the active magnesium oxide effectively improves the strength of the cement solidified soil, and effectively improves the cohesion and internal friction angle mechanical parameters of the cement solidified soil. Similarly, as the cement mixing ratio increases, the unconfined compressive strength of the sample increases, and the unconfined compressive strength of the sample (including the cohesion and internal friction angle mechanical parameters) increases with the extension of the age; with the increase of the active magnesium oxide mixing ratio, the unconfined compressive strength of the sample with the same cement mixing ratio first increases and then decreases, especially the change of 28d age is more obvious, the cohesion of the active magnesium oxide mixing ratio of 3% is 37.4% higher than that of the active magnesium oxide mixing ratio of 2%, and the results of the test design meet the strength requirements of the foundation design. Therefore, according to the test results and the engineering economy requirements, the scheme of cement mixing ratio of 3% and active magnesium oxide mixing ratio of 3% is adopted, that is, the final design quality mixing ratio is selected as: undisturbed soil: cement: active magnesium oxide = 100:3:3, and the water-binder ratio is 1:1.

[0055] The diameter and height of the unconfined test sample are 39.1mm and 80mm respectively, the triaxial test is a cylindrical sample with a diameter of 39.1mm and a height of 80mm, all the samples should be demolded after 48h, the test pieces are placed in the standard curing box water, the spacing between the test pieces should not be less than 10mm, and the water surface should not be less than 20mm higher than the surface of the test piece.

[0056] Example Two

[0057] The difference from Example One is that:

[0058] B. Three different cement mixing ratios are determined, and the three different cement mixing ratios are 3%-9% of the mass of the undisturbed soil respectively;

[0059] C. The water-binder ratio is 1:1, and the active magnesium oxide mixing ratio of the purity not less than 95% is 2%-4% of the mass of the cement.

[0060] Example Three

[0061] The difference from Example One is that:

[0062] B. Three different cement mixing ratios are determined, and the three different cement mixing ratios are 3%-9% of the mass of the undisturbed soil respectively;

[0063] C. The water-binder ratio is 1:1, and the active magnesium oxide mixing ratio of the purity not less than 95% is 2%-4% of the mass of the cement.

[0064] Embodiment Four

[0065] On the basis of Embodiments One to Three, whether the slurry fluidity meets the requirements is the primary factor for the quality inspection of the standard sample, and the fluidity not meeting the requirements will have a great impact on the quality of the cement. At present, it is also impossible to make the active magnesium oxide have different activity degrees, so if the original standard is still followed, the hydration reaction of the active magnesium oxide cement will be affected.

[0066] Step 1: Obtain the physical property data of the active magnesium oxide.

[0067] The physical property data includes the particle size of the active magnesium oxide.

[0068] Specifically, before being mixed, a plurality of groups of active magnesium oxide samples with the same weight are obtained by random sampling.

[0069] The particle size data of each group of active magnesium oxide samples are obtained, including the particle size of the active magnesium oxide.

[0070] The scanning electron microscope (SEM) is a high-resolution microscope that can be used to observe the morphology and size of particles. Through the SEM, the particle size of the active magnesium oxide particles can be directly observed.

[0071] Step 2: Analyze the particle size data of each group of active magnesium oxide samples to obtain the total activity influence factor of the mixed active magnesium oxide.

[0072] Specifically, for the particle size data of each group of active magnesium oxide samples, feature recognition is performed, and the active magnesium oxide target objects larger than the standard particle size are extracted, which are marked as low-activity target objects. The active magnesium oxide target objects equal to the standard particle size are extracted, which are marked as normal-activity target objects. The active magnesium oxide target objects smaller than the standard particle size are extracted, which are marked as high-activity target objects.

[0073] The particle size of the low-activity target objects, the normal-activity target objects, and the high-activity target objects is counted, and the proportion influence factor of the low-activity target objects is calculated by a formula, which is specifically as follows:

[0074]

[0075] In the formula (1), Xd is the influence factor of the low-activity target objects, a = 1, 2, …, i is the number of low-activity target objects, wd i is the particle size of the i-th low-activity target object, b = 1, 2, …, j is the number of low-activity target objects, wd jDiameter of the jth normal active target; c = 1, 2, …, k, number of low active targets, wd k Diameter of the kth normal active target;

[0076] More specifically, the low active targets continue to be analyzed, and the difference impact factor of the low active targets is calculated by a formula, and the formula is as follows:

[0077]

[0078] In formula (2), Xc is the difference impact factor of the low active targets, a = 1, 2, …, i, number of low active targets, wd i Diameter of the ith low active target, wdb is the standard diameter active magnesium oxide target;

[0079] The proportion impact factor of the low active targets of each group of active magnesium oxide samples is multiplied by the difference impact factor of the low active targets to obtain the activity impact factor of each group of active magnesium oxide samples. The activity impact factor of all groups of active magnesium oxide samples is calculated by averaging to obtain the activity impact factor of the active magnesium oxide sample. The total activity impact factor of the active magnesium oxide incorporated is calculated by a formula, and the formula is as follows:

[0080]

[0081] In formula (3), XZ is the total activity impact factor of the active magnesium oxide incorporated, mz is the total mass of the active magnesium oxide incorporated, my is the total mass of each group of active magnesium oxide samples, and Xy is the activity impact factor of the active magnesium oxide sample.

[0082] Step 3: Based on the total activity impact factor of the active magnesium oxide incorporated, the compensation coefficient is calculated;

[0083] Specifically, when the total activity impact factor of the active magnesium oxide incorporated is obtained, the compensation coefficient is calculated by a formula, and the specific formula is as follows:

[0084]

[0085] In formula (4), XM is the compensation coefficient, XZ is the total activity impact factor of the active magnesium oxide incorporated, mz is the total mass of the active magnesium oxide incorporated, and wdb is the standard diameter active magnesium oxide target.

[0086] Step 4: Obtain the compensation coefficient and the process preset stirring speed, and multiply the process preset stirring speed and the compensation coefficient to obtain the stirring speed increase;

[0087] The stirring speed increase amount obtained is sent to a stirrer for controlling stirring of the slurry, so that the stirrer increases the corresponding stirring speed increase amount on the stirring speed preset by the process;

[0088] The technical scheme of the embodiment of the present application: through the activity detection of the active magnesium oxide, the proportion degree of the effective active magnesium oxide quality and the activity proportion degree of the active magnesium oxide are judged to control the stirring speed, so that the adjusted stirring speed can increase the shear force on the active magnesium oxide, and then improve the particle size of the active magnesium oxide to improve the activity of the active magnesium oxide, and then make the quality and activity of the mixed active magnesium oxide meet the requirement of cement fluidity, finally the slurry not only meets the process standard in fluidity, but also improves the activity requirement of the active magnesium oxide, promotes the hydration reaction of the cement, and improves the early strength of the composite foundation.

[0089] The working principle of the present application is as follows: Figures 2-5As shown, the present application forms a composite foundation meeting the bearing capacity requirements of the specification by a series of physical and chemical reactions between the solidified material cement, active magnesium oxide and the reinforced silt soil, and the main solidification effects are as follows: after the cement soil is injected with the slurry, with the growth of the curing period, the grouting material continuously undergoes hydration reaction and carbonation reaction, accompanied by continuous precipitation of cementitious substances, and the chemical reaction of active magnesium oxide produces volume expansion, the flaky crystals generated in the process are formed into an interlocking skeleton through ion exchange chemical reaction with the original crystals, thereby making up for the associated pore problems caused by the hardening of the cement soil, so that the soil structure becomes dense, and the crystal products after chemical reaction combine with the soil to form a composite, thereby enhancing the bearing capacity of the subgrade, and forming a composite foundation with high strength and low compressibility in the silt layer that meets the strength requirements of the subgrade, thereby achieving the effect of reinforcing the soft foundation; the unconfined compression test is the main method for strength testing in engineering, and the test procedure is mature and has strong standardization, through the summary of the test, the influence of the mixing ratio of the composite slurry on the test strength is discussed; the triaxial test is an important method for determining the shear strength index of soil in engineering, through the summary of the test results, the influence of the mixing ratio of the grouting slurry on the shear strength parameters of cohesion and internal friction angle is discussed, according to the analysis of the test results, the active magnesium oxide effectively improves the strength of the cement solidified soil, and effectively improves the cohesion and internal friction angle mechanical parameters of the cement solidified soil; similarly, with the continuous increase of the cement mixing ratio, the unconfined compressive strength of the sample continuously increases, and the unconfined compressive strength of the sample (including the cohesion and internal friction angle mechanical parameters) increases with the extension of the age; and with the increase of the active magnesium oxide mixing ratio, the unconfined compressive strength of the sample with the same cement mixing ratio first increases and then decreases, especially the change of the 28d age is more obvious, the cohesion of the active magnesium oxide mixing ratio of 3% is 37.4% higher than that of the active magnesium oxide mixing ratio of 2%, and the test design results of the cement mixing ratio of 3% to 9% and the active magnesium oxide mixing ratio of 2% to 4% all meet the design strength requirements of the foundation, therefore, according to the test results and the engineering economy requirements, the cement mixing ratio of 3% and the active magnesium oxide mixing ratio of 3% are adopted.

[0090] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the implementation of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. A method for designing a mixture ratio of a magnesium-based grouting reinforcement slurry, characterized by, The method comprises the following steps: The silt material of the undisturbed soil, cement, and active magnesium oxide are taken as raw materials, the natural moisture content of the undisturbed silt is first determined, then the undisturbed soil is dried at a constant temperature of 60-70 DEG C for 6-8 hours, the dried soil is crushed and passed through a 0.5 mm sieve to obtain dried soil, and the moisture content of the dried soil is measured; Three different cement mixing ratios are determined, and the three different cement mixing ratios are 3-9% of the mass of the undisturbed soil; The active magnesium oxide with a purity of not less than 95% is selected, and the mixing ratio of the active magnesium oxide is 2-4% of the mass of the cement; three different cement mixing ratio slurries are prepared, and the three different cement mixing ratio slurries all meet the flowability conditions of the slurry; During the preparation of the slurry, the cement and the dried soil are uniformly mixed, then the active magnesium oxide and water are stirred uniformly to prepare a cementing liquid, the cementing liquid is added once or gradually, stirring is started from the time when the cementing liquid is added and is continued until uniform stirring is achieved, the stirring time is not less than 5 minutes, and after uniform stirring, the mixture is loaded into a test mold to form a standard test sample; The test sample is placed in a standard curing tank according to the requirements of the specification, and the slurry test samples of the three different cement mixing ratios are subjected to three unconfined compression tests and triaxial shear tests at 7-28 d of age; The three different cement mixing ratio slurries are prepared, and the specific process is as follows: The physical property data of the active magnesium oxide are obtained; wherein the physical property data include the particle size of the active magnesium oxide, The particle size data of each group of active magnesium oxide samples are analyzed to obtain the total activity influence factor of the active magnesium oxide mixing; Based on the total activity influence factor of the active magnesium oxide mixing, a compensation coefficient is calculated; The compensation coefficient and the process preset stirring speed are multiplied to obtain the stirring speed increase amount; The proportion influence factor of the low-activity target object of each group of active magnesium oxide samples is multiplied by the difference influence factor of the low-activity target object to obtain the activity influence factor of each group of active magnesium oxide samples; the activity influence factors of all groups of active magnesium oxide samples are averaged to obtain the activity influence factor of the active magnesium oxide sample; and the total activity influence factor of the active magnesium oxide mixing is calculated through a formula, and the formula is as follows: Wherein, XZ is the total activity influence factor of the active magnesium oxide mixing, mz is the total mass of the mixed active magnesium oxide, my is the total mass of each group of active magnesium oxide samples, and Xy is the activity influence factor of the active magnesium oxide sample; The process of obtaining the influence factor of the low-activity target object is as follows: The particle size data of each group of active magnesium oxide samples are analyzed to obtain the total activity influence factor of the active magnesium oxide mixing; The particle size of the low-activity target object, the normal-activity target object, and the high-activity target object is counted, and the proportion influence factor of the low-activity target object is calculated through a formula, and the formula is as follows: （1） wherein formula (1), Xd is the impact factor of low-activity targets, a = 1, 2, …, i, is the number of low-activity targets, wd a is the particle size of the i th low-activity target; b = 1, 2, …, j, is the number of low-activity targets, wz b is the particle size of the j th normal-activity target; c = 1, 2, …, k, is the number of low-activity targets, wg c is the particle size of the k th normal-activity target; The process for obtaining the difference impact factor of the low-activity target is as follows: The difference impact factor of the low-activity target is calculated by a formula, which is as follows: （2） wherein formula (2), Xc is the difference impact factor of low-activity target, a = 1, 2, …, i, is the number of low-activity target, wdb is the standard particle size of active magnesium oxide target; and wda is the particle size of the i th low-activity target. a wherein formula (2), Xc is the difference impact factor of low-activity target, a = 1, 2, …, i, is the number of low-activity target, wdb is the standard particle size of active magnesium oxide target; and wda is the particle size of the i th low-activity target. a The process for obtaining the compensation coefficient is as follows: When the total activity impact factor of the active magnesium oxide incorporated is obtained, the compensation coefficient is calculated by a formula, which is as follows: wherein XM is the compensation coefficient, XZ is the total activity impact factor of the active magnesium oxide incorporated, mz is the total mass of the active magnesium oxide incorporated, and wdb is the standard particle size of the active magnesium oxide target.

2. The method for mix proportion design of magnesium-based grouting reinforcement slurry according to claim 1, characterized in that, The raw soil: cement: active magnesium oxide = 100:3:

3.

3. The method for mix proportion design of magnesium-based grouting reinforcement slurry according to claim 1, characterized in that, The water-binder ratio is 1:

1.

4. The method for mix proportion design of magnesium-based grouting reinforcement slurry according to claim 1, characterized in that, The diameter and height of the unconfined test sample are 39.1 mm and 80 mm respectively, and the diameter and height of the triaxial test sample are 39.1 mm and 80 mm respectively.

5. The method for mix proportion design of magnesium-based grouting reinforcement slurry according to claim 1, characterized in that, The sample should be demolded after being placed for 48 h, and the test piece is placed in a standard curing tank for water curing, the interval between the test pieces should be not less than 10 mm, and the water surface should be higher than the surface of the test piece by not less than 20 mm.

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