In-service highway deterioration base non-darcy flow grouting fullness degree evaluation method and system thereof

Abstract

The application provides a method and system for evaluating the filling degree of non-Darcy flow grouting of a deteriorated base layer of an in-service highway, and belongs to the technical field of road repair. The method comprises the following steps: establishing a non-Darcy flow grouting diffusion model suitable for the deteriorated base layer of the in-service highway; determining the diffusion radius of the grouting liquid by means of the grouting-related parameters and the related parameters of the deteriorated base layer of the in-service highway; and dynamically updating the diffusion radius of the grouting liquid by means of the grouting time, so as to dynamically evaluate the filling degree of non-Darcy flow grouting of the deteriorated base layer of the in-service highway. Based on the non-Darcy flow diffusion model of the grouting liquid of the deteriorated base layer of the road, the diffusion radius of the grouting liquid is determined by means of the grouting-related parameters and the related parameters of the deteriorated base layer of the in-service highway, and the filling degree of non-Darcy flow grouting of the deteriorated base layer of the in-service highway is divided by means of the diffusion radius of the grouting liquid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road repair, in particular to a method and system for evaluating the grouting fullness of non-Darcy flow of a deteriorated base layer of an in-service highway. BACKGROUND

[0002] Grouting technology is an effective trenchless technology for treating deteriorated base layers of operating roads. However, since road base layers are concealed structures, grouting technology has certain blindness in the scenario of trenchless treatment, and the grouting fullness is difficult to accurately grasp, resulting in poor treatment effect of many grouting projects for deteriorated base layers of roads. The grouting liquid diffusion radius is a very critical indicator for controlling the grouting fullness. If the grouting liquid diffusion radius is not determined properly, two situations may occur: 1. The grouting liquid does not completely cover the area to be treated, resulting in low grouting fullness and poor grouting effect; 2. The grouting liquid diffusion range is too large, causing waste of grouting materials. Therefore, the grouting liquid diffusion radius needs to be as accurate as possible. The existing calculation method for the grouting liquid diffusion radius is often obtained by experience, such as "Guidelines for Grouting Reinforcement Technology of Highway Pavement Base Layers" (DBJT45 / T 030-2021), which lacks scientificity. Some other calculation methods for the grouting liquid diffusion radius are obtained by assuming that the grouting liquid is in a Darcy flow state. However, the permeability of road base layers is between soil and rock, which belongs to low-permeability medium, and the diffusion of grouting liquid in the base layer conforms to the non-Darcy flow state. Therefore, the existing grouting liquid diffusion radius determination does not conform to the actual situation of the grouting fullness of deteriorated base layers of in-service highways. Therefore, it is necessary to design a method and system for evaluating the grouting fullness of non-Darcy flow of deteriorated base layers of in-service highways. SUMMARY

[0003] The present application relates to the technical field of road repair, in particular to a method and system for evaluating the grouting fullness of non-Darcy flow of a deteriorated base layer of an in-service highway.

[0004] The method can improve the accuracy and efficiency of evaluation of grouting fullness degree of deteriorated base of in-service highway. The method is realized based on a non-Darcy flow diffusion model of grouting liquid of deteriorated base of in-service highway, the diffusion radius of grouting liquid is determined by the related parameters of grouting and the related parameters of deteriorated base of in-service highway, and the non-Darcy flow grouting fullness degree of deteriorated base of in-service highway is divided by the diffusion radius of grouting liquid. The non-Darcy flow grouting fullness degree of deteriorated base of in-service highway can be dynamically evaluated by dynamically updating the diffusion radius of grouting liquid by grouting time. The system is composed of a data acquisition unit, a data processing unit and an evaluation unit, can monitor the diffusion radius of grouting liquid in real time, and quickly evaluate the non-Darcy flow grouting fullness degree of deteriorated base of in-service highway by data processing and analysis.

[0005] In order to achieve the above object, the technical scheme adopted by the present application is as follows:

[0006] The non-Darcy flow grouting fullness degree evaluation method of deteriorated base of in-service highway establishes a non-Darcy flow grouting diffusion model suitable for deteriorated base of in-service highway, determines the diffusion radius of grouting liquid by the related parameters of grouting and the related parameters of deteriorated base of in-service highway, and dynamically updates the diffusion radius of grouting liquid by grouting time, so as to dynamically evaluate the non-Darcy flow grouting fullness degree of deteriorated base of in-service highway.

[0007] Further, in the non-Darcy flow grouting diffusion model suitable for deteriorated base of in-service highway, the input parameters of the non-Darcy flow grouting diffusion model of deteriorated base of in-service highway first cover the grouting pipe radius r0, the grouting pressure p g , the grouting liquid density ρ g , the dynamic viscosity of grouting liquid μ g , the compression coefficient of grouting liquid c g , the grouting depth of base H, the permeability of base β, the porosity of base The compression coefficient of base c s , the initial water pressure of base p0, the empirical coefficient m related to seepage of base and the grouting diffusion radius R(t) related to grouting time t.

[0008] Further, the specific process of the non-Darcy flow grouting diffusion model suitable for deteriorated base of in-service highway is as follows:

[0009] The control equation of the non-Darcy flow grouting diffusion model of deteriorated base of in-service highway is as follows:

[0010]

[0011] Wherein c t =c s +c g ;

[0012] For the initial time of grouting, i.e. t=0, p(r,t) satisfies the following initial condition:

[0013] p(r,0) = p0 (26)

[0014] The grout is injected into the road base from the grouting pipe, and the grouting pressure is kept constant during the grouting process. For the grouting pipe radius, i.e. r=r0, p(r,t) satisfies the following boundary condition:

[0015] p(r=r0,t) = p g (27)

[0016] During the transmission of the grout in the base, the grouting pressure of the grout front has the following specific relationship:

[0017] p(r=R(t),t) = p0 (28)

[0018]

[0019] The above formulas (1)-(5) jointly constitute the mathematical model of the non-Darcy flow grouting diffusion model of the deteriorated base of the in-service highway.

[0020] Further, by solving the above formulas (1)-(5), the non-Darcy flow grouting diffusion model of the deteriorated base of the in-service highway can be obtained;

[0021] A new function is constructed as follows

[0022]

[0023] Bringing formula (6) into the mathematical model of the non-Darcy flow grouting diffusion model of the deteriorated base of the in-service highway, i.e. formulas (1)-(5), the following four equations can be obtained:

[0024]

[0025] p(η=0) = p0 (32)

[0026] p(η=η0) = p g (33)

[0027] p(η=η R ) = p0 (34)

[0028]

[0029] wherein and

[0030] Set dp / dη=P, and perform order reduction on formula (7) as follows:

[0031]

[0032] The above formula is a Bernoulli equation, and its general solution is:

[0033]

[0034] Substituting the above formula (11) into formula (13) can determine c in formula (13) as:

[0035]

[0036] Therefore, formula (13) is rewritten as follows:

[0037]

[0038] Further processing the above formula (15) is rewritten as follows:

[0039]

[0040] wherein,

[0041] The corresponding rewriting of the above formula (9)-(10) is as follows:

[0042]

[0043] After integrating formula (16) and combining with formula (18), the following equation is obtained:

[0044]

[0045] Further, formula (17) is substituted into formula (19) to obtain:

[0046]

[0047] By rearranging formula (20), the value of η R is obtained as:

[0048]

[0049] By combining formula (6) and formula (21), the grouting liquid diffusion radius R(t) of the non-Darcy flow grouting diffusion model of the deteriorated base of the in-service highway is derived as:

[0050]

[0051] Let t in formula (22) equal the grouting setting time T, and the non-Darcy flow grouting liquid diffusion radius R(T) of the deteriorated base of the in-service highway is obtained as follows.

[0052]

[0053] Further, the specific process for determining the grouting liquid diffusion radius by obtaining the grouting related parameters and the in-service highway deteriorated base related parameters in advance is as follows:

[0054] The collected grouting pipe radius r0, grouting pressure p g , grouting liquid density p g , grouting liquid dynamic viscosity m g , grouting liquid compressibility c g , base grouting depth H, base permeability b, and base porosity are brought into formula (23) as follows: The base compressibility c s , and the initial water pressure p0 of the base and the base empirical coefficient m related to seepage are brought into formula (23) at the same time, and the R(T) value can be solved.

[0055] Further, the specific process for dynamically updating the grouting liquid diffusion radius by grouting time, so as to dynamically evaluate the non-Darcy flow grouting fullness degree of the in-service highway deteriorated base is as follows:

[0056] The grouting reinforcement area unit grid is set as a square with a side length of L, and the non-Darcy flow grouting fullness degree index A(T) of the in-service highway deteriorated base is defined as follows:

[0057]

[0058] The non-Darcy flow grouting fullness degree index A(T) of the in-service highway deteriorated base obtained by calculation is used to divide the non-Darcy flow grouting fullness degree evaluation grades of the in-service highway deteriorated base.

[0059] The system of the non-Darcy flow grouting fullness degree evaluation method of the in-service highway deteriorated base comprises a data acquisition unit, a data processing unit, and an evaluation unit, and the data acquisition unit is connected with the data processing unit and the evaluation unit.

[0060] The data acquisition unit is used to collect the grouting pipe radius r0, grouting pressure p g , grouting liquid density p g , grouting liquid dynamic viscosity m g , grouting liquid compressibility c g , base grouting depth H, base permeability b, and base porosity. The base compressibility c s, the initial water pressure of the base layer p0, the empirical coefficient m related to seepage of the base layer, the data processing unit is composed of the analytical solution of the non-Darcy flow grouting diffusion model of the deteriorated base layer of the in-service highway, the development of the grouting liquid diffusion radius R(T) of the non-Darcy flow grouting of the deteriorated base layer of the in-service highway with the grouting time T can be obtained by importing the data in the data acquisition unit into the data processing unit, the evaluation unit is a square unit grid with the side length L of the grouting reinforcement area, including the non-Darcy flow grouting fullness index A(T) of the deteriorated base layer of the in-service highway and the non-Darcy flow grouting fullness grading method of the deteriorated base layer of the in-service highway, the non-Darcy flow grouting fullness index A(T) of the deteriorated base layer of the in-service highway is determined by the grouting liquid diffusion radius R(T) and the square unit grid with the side length L, and the non-Darcy flow grouting fullness grade of the deteriorated base layer of the in-service highway is divided by using the non-Darcy flow grouting fullness grading method.

[0061] Further, the grouting time T in the data processing unit is updated in real time as needed, and the updated data can cause the grouting liquid diffusion radius R(T) to change, so that the non-Darcy flow grouting fullness of the deteriorated base layer of the in-service highway is dynamically evaluated.

[0062] The present application has the following beneficial effects due to the adoption of the above technical scheme:

[0063] The present application is realized based on the non-Darcy flow diffusion model of the grouting liquid of the deteriorated base layer of the in-service highway, the grouting liquid diffusion radius is determined by the grouting related parameters and the related parameters of the deteriorated base layer of the in-service highway, and the non-Darcy flow grouting fullness of the deteriorated base layer of the in-service highway is divided by the grouting liquid diffusion radius. BRIEF DESCRIPTION OF DRAWINGS

[0064] Figure 1 It is the grouting fullness grade evaluation system block diagram of the present application;

[0065] Figure 2 It is the data processing unit output image of the embodiment of the present application;

[0066] Figure 3 It is the evaluation unit output image of the embodiment of the present application. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical scheme and advantages of the present application more clear, the following preferred embodiments are given with reference to the drawings, and the present application is further described in detail. However, it should be pointed out that many details in the description are only used to make the reader have a thorough understanding of one or more aspects of the present application, and the aspects of the present application can be realized without these specific details.

[0068] As Figure 1The in-service highway deteriorated base non-Darcy flow grouting fullness degree evaluation method system shown, including a data acquisition unit, a data processing unit and an evaluation unit, the data acquisition unit is connected with the evaluation unit through the data processing unit.

[0069] The data acquisition unit is used for collecting grouting pipe radius r0, grouting pressure p g , slurry density p g , dynamic viscosity of slurry m g , compressibility of slurry c g , base grouting depth H, permeability of base b, porosity of base compressibility of base c s , initial water pressure of base p0, empirical coefficient m related to seepage of base, the data processing unit is composed of an analytical solution of the in-service highway deteriorated base non-Darcy flow grouting diffusion model, after the data in the data acquisition unit is imported into the data processing unit, the development of the in-service highway deteriorated base non-Darcy flow grouting liquid diffusion radius R(T) with grouting time T can be obtained, the evaluation unit is a square unit grid with side length L of the grouting reinforcement area, including an in-service highway deteriorated base non-Darcy flow grouting fullness degree index A(T) and an in-service highway deteriorated base non-Darcy flow grouting fullness degree grade division method, the in-service highway deteriorated base non-Darcy flow grouting fullness degree index A(T) is determined by the grouting liquid diffusion radius R(T) and the square unit grid with side length L, and the in-service highway deteriorated base non-Darcy flow grouting fullness degree grade is divided by using the in-service highway deteriorated base non-Darcy flow grouting fullness degree grade division method.

[0070] Based on a practical road deteriorated base grouting project, according to the grouting situation and the road base situation, the following group of measured calculation parameters is given: grouting pipe radius r0=0.019 m, grouting pressure p g =10 6 Pa, slurry density p g =2038.1 kg / m 3 , dynamic viscosity of slurry m g =258.5 Pa·s and compressibility of slurry c g =4.6×10 -10 Pa -1 , base grouting depth H=0.8 m, permeability of base b=2.16×10 -14 m 2 , porosity of base compressibility of base c s =8×10 - 10 Pa -1 , initial water pressure of base p0=0 Pa, empirical coefficient m related to seepage of base=1.65. The side length L of the square unit grid of the grouting reinforcement area is 3 m.

[0071] Running deterioration level evaluation system:

[0072] (1) Click start, enter the data acquisition unit.

[0073] (2) The above r0, p g , p g , mu g , c g , H, beta, c s , p0, m imported into the data acquisition system, click next to enter the data processing unit.

[0074] (3) The data processing unit can automatically output the development of the in-service highway deterioration base non-Darcy flow grouting liquid diffusion radius R(T), as shown below Figure 2 . Click next to enter the evaluation unit.

[0075] (4) Evaluation unit. According to the side length L=3m of the square unit grid of the grouting reinforcement area, the specific form of the in-service highway deterioration base non-Darcy flow grouting fullness index A(T) can be determined, as shown in the following formula

[0076]

[0077] According to the in-service highway deterioration base non-Darcy flow grouting fullness level evaluation grouting fullness shown in Table 1, as Figure 3 can be seen, each grouting fullness stage corresponds to a time interval. In other words, it can be evaluated that the in-service highway deterioration base non-Darcy flow grouting fullness is in which stage during grouting. So when the grouting time T is 80s, it can be known that it is in the moderate fullness stage.

[0078] (5) Manual intervention: according to the example evaluation unit to determine the in-service highway deterioration base non-Darcy flow grouting fullness level, and then refer to Table 1 for manual intervention until the grouting is fully full.

[0079] Table 1 In-service highway deterioration base non-Darcy flow grouting fullness level division data

[0080] Fullness Grouting fullness indicator A (T) Human intervention Micro fullness 0-25％ Normal grouting Mild fullness 25％-50％ Normal grouting Moderate fullness 50％-75％ Slow grouting Severe fullness 75％-100％ Micro grouting Complete fullness 100％ Stop grouting

[0081] The method is based on a non-Darcy flow diffusion model of the road deteriorated base grouting liquid, the grouting liquid diffusion radius is determined by obtaining the grouting related parameters and the in-service road deteriorated base related parameters in advance, and the non-Darcy flow grouting fullness degree of the in-service road deteriorated base is divided by the grouting liquid diffusion radius. The method can dynamically update the grouting liquid diffusion radius by the grouting time, so as to dynamically evaluate the non-Darcy flow grouting fullness degree of the in-service road deteriorated base. The system is composed of a data acquisition unit, a data processing unit and an evaluation unit, can monitor the grouting liquid diffusion radius in real time, and quickly evaluate the non-Darcy flow grouting fullness degree of the in-service road deteriorated base through data processing and analysis.

[0082] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the scope of protection of the present application.

Claims

1. A method for evaluating the grouting saturation degree of non-Darcy flow of in-service highway deteriorated subgrade, characterized in that: The non-Darcy flow grouting diffusion model suitable for the in-service highway deteriorated base is established, the grouting liquid diffusion radius is determined by the grouting related parameters and the in-service highway deteriorated base related parameters, the grouting liquid diffusion radius is dynamically updated through the grouting time, so as to dynamically evaluate the non-Darcy flow grouting fullness degree of the in-service highway deteriorated base; To establish a non-Darcy flow grouting diffusion model suitable for the in-service highway deteriorated base, first, the input parameters of the non-Darcy flow grouting diffusion model of the in-service highway deteriorated base cover the grouting pipe radius r0, the grouting pressure p g , the slurry density ρ g , the dynamic viscosity of the slurry μ g , the compressibility of the slurry c g , the grouting depth of the base H, the permeability of the base β, the porosity of the base The compressibility of the base c s , the initial water pressure of the base p0, the empirical coefficient m related to seepage of the base and the grouting diffusion radius R(t) related to the grouting time t ; The specific process of establishing the non-Darcy flow grouting diffusion model suitable for the in-service highway deteriorated base is as follows: The control equation of the non-Darcy flow grouting diffusion model suitable for the in-service highway deteriorated base is as follows: where c t = c s + c g ; For the initial moment of grouting, that is, t=0, p(r,t) satisfies the following initial condition: p(r,0)=p0 (2) The grouting liquid is injected into the road base from the grouting pipe, the grouting pressure is kept constant during the grouting process, for the grouting pipe radius, that is, r=r0, p(r,t) satisfies the following boundary condition: p(r = ro, t) = p g (3) During the transmission of the grouting liquid in the base, the grouting pressure of the grouting liquid front has the following specific relationship: p(r=R(t),t)=p0 (4) The above formulas (1)-(5) jointly constitute the mathematical model of the non-Darcy flow grouting diffusion model of the in-service highway deteriorated base; The non-Darcy flow grouting diffusion model of the in-service highway deteriorated base can be obtained by solving the above formulas (1)-(5); A new function is constructed as follows Bring formula (6) into the mathematical model of the non-Darcy flow grouting diffusion model of the in-service highway deteriorated base, that is, formulas (1)-(5), to obtain the following five equations: p(η=0)=p0 (8) p (η = η0) = p g (9) p (η = η R ) = p0 (10) wherein and Set dp / dη=P, and perform order reduction processing on formula (7) as follows: The above formula is a Bernoulli equation, and its general solution is: Bring formula (11) into formula (13) to determine c in formula (13) as: Therefore, formula (13) is rewritten as follows: Further process formula (15) and rewrite as follows: wherein The corresponding rewriting of formulas (9)-(10) is as follows: Integrate formula (16) and combine with formula (18) to obtain the following equation: Further bring formula (17) into formula (19) to obtain: Rearranging equation (20) gives η R The value of η is: Through combination of formula (6) and formula (21), the grouting liquid diffusion radius R(t) of the non-Darcy flow grouting diffusion model of the in-service highway deteriorated base is derived as: Let t in formula (22) equal the set grouting time T, and the non-Darcy flow grouting liquid diffusion radius R(T) of the in-service highway deteriorated base can be obtained as follows:

2. The method for evaluating the grouting saturation degree of non-Darcy flow of in-service highway deteriorated subgrade according to claim 1, characterized in that: The specific process of determining the grouting liquid diffusion radius by the grouting related parameters and the in-service highway deteriorated base related parameters in advance is as follows: The collected grouting pipe radius r0, grouting pressure p g , slurry density p g , dynamic viscosity of slurry m g , compressibility of slurry c g , base layer grouting depth H, permeability of base layer b, porosity of base layer Compressibility of base layer c s , initial water pressure of base layer p0, and empirical coefficient m related to seepage of base layer are brought into formula (23) synchronously, and then R(T) value can be solved.

3. The method for evaluating the grouting saturation degree of non-Darcy flow of in-service highway deteriorated subgrade according to claim 2, characterized in that: The specific process of dynamically updating the grouting liquid diffusion radius through the grouting time, so as to dynamically evaluate the non-Darcy flow grouting fullness degree of the in-service highway deteriorated base, is as follows: Set the grouting reinforcement area unit grid as a square with a side length of L, and define the non-Darcy flow grouting fullness degree index A(T) of the in-service highway deteriorated base as follows: The non-Darcy flow grouting fullness degree index A(T) of the in-service highway deteriorated base obtained by calculation is used to divide the non-Darcy flow grouting fullness degree evaluation grades of the in-service highway deteriorated base.

4. The system for evaluating the grouting saturation degree of the non-Darcy flow of the deteriorated subgrade of the in-service highway according to claim 1, characterized in that: The system comprises a data acquisition unit, a data processing unit and an evaluation unit, the data acquisition unit is connected with the data processing unit and the evaluation unit. The data acquisition unit is used to collect the radius r0 of the grouting pipe, the grouting pressure p g , the density p of the grout g , the dynamic viscosity m of the grout g , the compressibility c of the grout g , the grouting depth H of the base layer, the permeability b of the base layer, and the porosity of the base layer The compressibility c of the base layer s , the initial water pressure p0 of the base layer, and the empirical coefficient m related to seepage of the base layer The data processing unit is composed of the analytical solution of the non-Darcy flow grouting diffusion model of the deteriorated base layer of the in-service highway, and the development of the grouting diffusion radius R(T) of the non-Darcy flow grouting liquid of the deteriorated base layer of the in-service highway with the grouting time T can be obtained by importing the data in the data acquisition unit into the data processing unit. The evaluation unit is a square unit grid with the side length L of the grouting reinforcement area, and includes the non-Darcy flow grouting fullness index A(T) of the deteriorated base layer of the in-service highway and the grading method of the non-Darcy flow grouting fullness of the deteriorated base layer of the in-service highway. The non-Darcy flow grouting fullness index A(T) of the deteriorated base layer of the in-service highway is determined by the grouting liquid diffusion radius R(T) and the square unit grid with the side length L, and the non-Darcy flow grouting fullness grade of the deteriorated base layer of the in-service highway is divided by using the grading method of the non-Darcy flow grouting fullness of the deteriorated base layer of the in-service highway.

5. The system for evaluating the grouting saturation degree of the non-Darcy flow of the deteriorated subgrade of the in-service highway according to claim 4, characterized in that: The grouting time T in the data processing unit is updated in real time as required, and the updated data can cause the change of the grouting liquid diffusion radius R(T), so as to achieve dynamic evaluation of the non-Darcy flow grouting fullness degree of the deteriorated base layer of the in-service highway.

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