A method for detecting mixed soil of silty sand and silty clay in earth pressure shield

Abstract

The application provides a kind of to soil pressure shield fine sand and silty clay mixed detection method, and the specific steps of detection method are as follows: the weight of fine sand and silty clay generated by soil pressure shield is weighed by server control weighing module according to different proportions;The weight weighed by weighing module is obtained by information acquisition module, fine sand and silty clay are mixed according to the weighing proportion by mixing module, a certain amount of aqueous solution is injected into the mixture and mixed into thick slurry, and the pollutant information in the thick slurry is obtained;Select the forming cavity, pour the thick slurry into the forming cavity and dry naturally, and take out after complete solidification;The mixed material after solidification is measured by viscosity detection module, and the punching value is obtained;The pollutant information and the punching value obtained are analyzed by data analysis module.The application considers the mixing viscosity and pollution degree based on different mixing proportions of fine sand and silty clay, and selects the most suitable mixing ratio.

Description

Technical Field

[0001] This invention relates to the field of detection technology for mixtures of fine sand and silty clay, and more particularly to a method for detecting mixtures of fine sand and silty clay in earth pressure shield tunneling machines. Background Technology

[0002] Earth pressure balance (EPB) tunnel boring machines (TBMs) are increasingly widely used in rail transit, municipal highway, and other engineering projects due to their safety and high degree of mechanization. Simultaneously, the amount of excavated material from these TBMs is also increasing daily. According to incomplete statistics, my country has over 3,000 TBMs in operation. Assuming a 30% idle rate, each 6m diameter TBM excavates 1.0km annually, and the excavated material density is 2t / m³, this figure is not directly related to the preceding information. 3 Calculations show that the annual volume of tunnel boring machine (TBM) excavation exceeds 119 million tons, and this large amount of waste TBM excavation has become a major obstacle to safe and efficient urban construction. Unlike ordinary excavation, TBM excavation mainly consists of soil and admixtures, containing various materials such as fine sand, clay minerals, modifiers, and foaming agents. Its unique physicochemical characteristics make it difficult to utilize directly. Research indicates that the fine sand and silty clay components in the excavation have reuse potential. For example, fine sand can be used to replace synchronous grouting sand sources, prepare recycled aggregates, and serve as fill materials; silty clay can be used to replace synchronous grouting clay particles, prepare tunneling mud, and prepare non-fired building materials. Therefore, to achieve the resource utilization of TBM excavation, a comprehensive analysis of the mixed components is necessary. Considering that the earth pressure tunneling process mixes fine sand and silty clay in different proportions, resulting in varying mixing viscosities in the excavation, current technologies struggle to determine the optimal mixing ratio of fine sand and silty clay based on these viscosities. Furthermore, fine sand and silty clay may contain a large amount of contaminants. Existing technologies are neither convenient for detecting these contaminants nor can they combine contaminant concentration and mixture viscosity to select a suitable ratio of the two materials. To address these issues, this invention proposes a method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention aims to provide a method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling. This invention measures the mixing viscosity and contaminant concentration of fine sand and silty clay at different mixing ratios, comprehensively considering both the mixing viscosity and the degree of contamination, to select the most suitable mixing ratio and improve the mixing effect of fine sand and silty clay.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: a method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines, the method comprising a weighing module, an information acquisition module, a mixing module, a viscosity detection module, a data analysis module, and a server; the specific steps of the detection method are as follows:

[0005] Step S1: The weighing module is controlled by the server to weigh the fine sand and silty clay generated by the earth pressure shield tunneling machine in different proportions.

[0006] Step S2: Obtain the weight by measuring the weight through the information acquisition module;

[0007] Step S3: The fine sand and silty clay are mixed sequentially according to different weighing ratios using the mixing module. A certain amount of aqueous solution is injected into the mixture to form a thick slurry. Information on pollutants in the thick slurry is obtained. Several molding cavities are selected, the mixture ratio is marked, the thick slurry is poured into the molding cavity and vibrated, and then allowed to air dry naturally until it is completely solidified before being removed.

[0008] Step S4: The solidified mixture is stamped and measured using a viscosity detection module to obtain the stamping value;

[0009] Step S5: Analyze the acquired pollutant information and stamping values ​​through the data analysis module, calculate the pollutant percentage based on the pollutant information, and determine the most suitable mixing ratio of fine sand and silty clay by combining the stamping values.

[0010] Furthermore, in step S1, the specific steps for weighing the silty clay and fine sand are as follows;

[0011] Step S11: Select the total weighing parts of silty clay and fine sand as n, and set the total weighing parts of different mixtures as n and the total weighing weight as S;

[0012] Step S12: Select 1 part of silty clay and n-1 parts of fine sand for weighing. The weight of 1 part of silty clay is: The weight of n-1 parts of fine sand is: The measured weight is transmitted to the information acquisition module;

[0013] Weigh 2 parts of silty clay and n-2 parts of fine sand. The weight of the 2 parts of silty clay is: The weight of n-2 parts of fine sand is: The measured weight is transmitted to the information acquisition module;

[0014] Weigh 3 parts of silty clay and n-3 parts of fine sand. The weight of the 3 parts of silty clay is: The weight of n-3 parts of fine sand is: The measured weight is transmitted to the information acquisition module;

[0015] ...

[0016] Weigh n-1 parts of silty clay and 1 part of fine sand to obtain the weight of n-1 parts of silty clay: The weight of 1 part of fine sand is The measured weight is transmitted to the information acquisition module.

[0017] Furthermore, in step S1, when weighing the silty clay and fine sand, the slag produced by the earth pressure shield tunneling should be collected and crushed first to separate the silty clay and fine sand from the slag.

[0018] Furthermore, in step S2, the information acquisition module arranges the symmetrical quantities of silty clay and fine sand in chronological order.

[0019] Furthermore, in step S3, the mixing module mixes the weighed silty clay and fine sand after the information acquisition module obtains the weighing weight.

[0020] When mixing the concentrated slurry, the volume of the injected aqueous solution is set to Vs; the weight is set to Mgs; and the weight of the concentrated slurry is set to NJMGz. The aqueous solution with a volume of Vs is injected into the mixture of fine sand and silty clay and mixed to form a concentrated slurry. The weight of the mixture is obtained as S from the information acquisition module. The weights of the aqueous solution and the concentrated slurry are calculated respectively.

[0021] When acquiring contaminants in concentrated slurry, the volume of the mixed slurry in the measuring instrument is measured, and the measurement volume is set as Vcltj; contaminant information is obtained based on the calculated weight information and the measured volume.

[0022] Furthermore, the concentrated slurry is extracted through a sampling tube, with the extraction volume set as Vcyg and the weight as Mcczl.

[0023] A concentrated slurry with a weight of Mcczl was spread out, dried, and the emitted gas components were obtained. The concentration of pollutants in the gas was measured. It was set that there were 'a' emitted gas components and 'b' pollutant gas components, with the gas component volume set as Vqt and the gas density as DUQTMDz. The first gas density was DUQTMDz1; the second gas density was DUQTMDz2; the third gas density was DUQTMDz3… the bth gas density was DUQTMDzb… the ath gas density was DUQTMDza.

[0024] The proportion of pollutant gas weight to the total weight of all gas components is calculated, and the mass proportion value is set as: QTZBz; the proportion of pollutants in the concentrated slurry is obtained based on the mass proportion value, and the pollutant proportion value is set as: WRWzb;

[0025] Weigh fine sand and silty clay with different proportions using the weighing module to obtain multiple pollutant percentage values, and then send these pollutant percentage values ​​to the data analysis module.

[0026] Furthermore, after obtaining the information on the contaminants in the slurry, a certain volume of cement is added to the slurry and mixed evenly. The mixed slurry is then injected into the molding cavity.

[0027] When mixing cement, a certain volume of aqueous solution is first added to the cement and stirred to form a cement slurry. The mixed cement slurry is then poured into a thick slurry and stirred to ensure that the cement slurry is fully mixed in the thick slurry.

[0028] Furthermore, in step S3, the number of molding cavities is set to n, and the volume of the cavity is smaller than the volume of the mixture of silty clay and fine sand; the concentrated slurry after mixing is poured into the molding cavity in chronological order to fill the molding cavity.

[0029] When the slurry is poured into the molding cavity, a vibrator is installed on the surface of the molding cavity and a seepage hole is installed at the bottom of the molding cavity. The vibrator makes the slurry fully adhere to the cavity, and the scraper makes the top of the slurry flush with the top of the molding cavity.

[0030] Set the thickness of the molding cavity to 3-10cm and the height to 20-70cm. When the solid mixture inside the molding cavity has completely solidified and dried, remove the solid mixture from the molding cavity. Fix one end of the removed solid mixture at the top and expose the other end at the bottom. Control the distance of exposure of multiple solid mixtures to be the same and perform stamping measurements on each one.

[0031] Furthermore, in step S4, when the mixture solid is stamped, the maximum instantaneous value at each stamping is obtained and defined as the stamping value; the obtained stamping values ​​are arranged in the order of stamping and sent to the data analysis module in sequence.

[0032] During the solid-mixture stamping process, the stamping contact surface is always in the same position. By marking the stamping surface at the same position of the solid-mixture mixture, the stamping surface and the stamping head of the stamping instrument are kept in the same straight line during each stamping.

[0033] Further, in step S5, the data analysis module receives the pollutant percentage value and the stamping value, and establishes a Cartesian coordinate system with time as the x-axis and the value magnitude as the y-axis; the obtained pollutant percentage value and stamping value are marked with corresponding points on the Cartesian coordinate system in chronological order, and defined as marker points; two points of pollutant percentage value are smoothly connected by a curve, which is set as the first curve; two points of stamping value are smoothly connected by a curve, which is set as the second curve; the data analysis module performs analysis based on the first curve and the second curve.

[0034] Furthermore, the specific analysis steps for the first and second curves are as follows:

[0035] Step S51: Observe the rise and fall of the first curve and the second curve, select the positions of the highest and lowest points of the first curve corresponding to the marked points of the second curve, obtain the values ​​of the highest and lowest points of the first curve, obtain the values ​​of the corresponding marked points of the second curve, and calculate the difference between the value of the corresponding marked point of the second curve and the highest and lowest points of the first curve. Set the difference of the highest point of the first curve as: WRCmax, and the difference of the lowest point as: WRCmin.

[0036] Step S52: Observe the rise and fall of the first curve and the second curve, select the positions of the highest and lowest points of the second curve corresponding to the marked points of the first curve, obtain the values ​​of the highest and lowest points of the second curve, obtain the values ​​of the corresponding marked points of the first curve, and calculate the differences between the values ​​of the highest and lowest points of the second curve and the corresponding marked points of the first curve. Set the difference of the highest point of the second curve as CYCmax and the difference of the lowest point as CYCmin.

[0037] Step S53: Observe the farthest distance between the first curve and the second curve, obtain the position of the corresponding mark point, calculate the difference between the corresponding mark point of the second curve and the corresponding mark point of the first curve, and set the difference value as: QXCZmax;

[0038] Step S64: Obtain the calculated difference information, compare the magnitudes of WRCmax, WRCmin, CYCmax, CYCmin, and QXCZmax, arrange them in ascending order, and select the median value; obtain the marker point of the median value on the first and second curves, and determine that the mixing and pressing effect at the marker point is qualified and the pollutant ratio is qualified; obtain the marker point of QXCZmax on the first and second curves, and determine that the mixing and pressing effect at the marker point is the best and the pollutant ratio is the smallest. The mixing and pressing requirements are met between the median value and the QXCZmax value, and the optimal mixing ratio of fine sand and silty clay is determined.

[0039] The beneficial effects of this invention are:

[0040] 1. This invention measures the mixing viscosity and contaminant concentration of fine sand and silty clay at different mixing ratios, comprehensively considers the mixing viscosity of the mixture and the degree of contamination, selects the most suitable mixing ratio, and improves the mixing effect of fine sand and silty clay.

[0041] 2. This invention keeps the total weight of silty clay and fine sand constant, but changes their internal proportions. By mixing and drying different proportions of fine sand and silty clay, the most suitable ratio is selected. Attached Figure Description

[0042] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0043] Figure 1 This is a schematic diagram illustrating the principle of a method for detecting a mixture of fine sand and silty clay in earth pressure shield tunneling machines according to the present invention.

[0044] Figure 2 This is a flowchart illustrating the steps of a method for detecting a mixture of fine sand and silty clay in earth pressure shield tunneling machines according to the present invention. Detailed Implementation

[0045] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0046] In this invention, please refer to Figure 1 and Figure 2 A method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines. The detection method includes a weighing module, an information acquisition module, a mixing module, a viscosity detection module, a data analysis module, and a server. The weighing module, information acquisition module, mixing module, viscosity detection module, and data analysis module are respectively connected to the server.

[0047] The specific steps of the detection method are as follows:

[0048] Step S1: The weighing module is controlled by the server to weigh the fine sand and silty clay generated by the earth pressure shield tunneling machine in different proportions.

[0049] When weighing silty clay and fine sand, the earth pressure shield tunneling excavated soil is first collected and crushed to separate the silty clay and fine sand from the excavated soil.

[0050] The specific steps for weighing silty clay and fine sand are as follows;

[0051] The total weighing fraction of silty clay and fine sand is n, and the total weighing fraction of different mixtures is n and the total weighing weight is S;

[0052] Weigh 1 part of silty clay and n-1 parts of fine sand. The weight of 1 part of silty clay is: The weight of n-1 parts of fine sand is: The measured weight is transmitted to the information acquisition module;

[0053] Weigh 2 parts of silty clay and n-2 parts of fine sand. The weight of the 2 parts of silty clay is: The weight of n-2 parts of fine sand is: The measured weight is transmitted to the information acquisition module;

[0054] Weigh 3 parts of silty clay and n-3 parts of fine sand. The weight of the 3 parts of silty clay is: The weight of n-3 parts of fine sand is: The measured weight is transmitted to the information acquisition module;

[0055] ...

[0056] Weigh n-1 parts of silty clay and 1 part of fine sand to obtain the weight of n-1 parts of silty clay: The weight of 1 part of fine sand is The measured weight is transmitted to the information acquisition module.

[0057] Step S2: The information acquisition module obtains the weight measured by the weighing module and arranges the silty clay and fine sand measured by the weighing module in chronological order;

[0058] Step S3: The fine sand and silty clay are mixed sequentially according to different weighing ratios using the mixing module. A certain amount of aqueous solution is injected into the current mixture to form a concentrated slurry. Information on contaminants in the concentrated slurry is acquired. During the concentrated slurry mixing, the volume of the injected aqueous solution is set to Vs; the weight is Mgs; and the weight of the concentrated slurry is NJMGz. The aqueous solution with a volume of Vs is injected into the mixture of fine sand and silty clay and mixed to form a concentrated slurry. The weight of the mixture is obtained as S from the information acquisition module. The weights of the aqueous solution and the concentrated slurry are then calculated using the following formula:

[0059] Mgs = Vs × 10 3 ;

[0060] The weight of the concentrated slurry is: NJMGz=Mgs+S;

[0061] When acquiring contaminants in concentrated slurry, the volume of the mixed slurry in the measuring instrument is measured, and the measurement volume is set as Vcltj; contaminant information is obtained based on the calculated weight information and the measurement volume.

[0062] The concentrated slurry is obtained through a sampling tube, with the sampling volume set as Vcyg and the weight as Mcczl; please refer to the following formula for specific calculation:

[0063]

[0064] A concentrated slurry with a weight of Mcczl was spread out, dried, and the emitted gas components were obtained. The concentration of pollutants in the gas was measured. It was set that there were 'a' emitted gas components and 'b' pollutant gas components. The volume of each gas component was set as Vqt, and the gas density was set as DUQTMDz. The first gas density was DUQTMDz1; the second gas density was DUQTMDz2; the third gas density was DUQTMDz3; ... the density of the bth gas was DUQTMDzb; ... the density of the ath gas was DUQTMDza.

[0065] The proportion of pollutant gas weight to the total weight of all gas components is calculated, and the mass proportion value is set as QTZBz; please refer to the following formula for specific calculation:

[0066]

[0067] The percentage of contaminants in the concentrated slurry is calculated based on the obtained mass percentage value. The contaminant percentage is set as WRWzb. Please refer to the following formula for specific calculation:

[0068] WRWzb=NJMGz×QTZBz;

[0069] Weigh fine sand and silty clay with different proportions according to the weighing module, obtain multiple pollutant percentage values, and send the pollutant percentage values ​​to the data analysis module.

[0070] After obtaining the information on the contaminants in the slurry, a certain volume of cement is added to the slurry and mixed evenly. The mixed slurry is then injected into the molding cavity.

[0071] When mixing cement, first add a certain volume of aqueous solution to the cement and stir to form cement slurry. Then pour the mixed cement slurry into the thick slurry and stir to mix, so that the cement slurry is fully mixed in the thick slurry.

[0072] Select multiple molding cavities, mark the mixing ratio on the molding cavities, pour the concentrated slurry into the molding cavities and vibrate, let it air dry naturally, and remove it after it has completely solidified.

[0073] The number of molding cavities is set to n, and the volume of each cavity is smaller than the volume of the mixture of silty clay and fine sand.

[0074] Pour the mixed slurry into the molding cavity in chronological order to fill the cavity.

[0075] When the slurry is poured into the molding cavity, a vibrator is installed on the surface of the molding cavity and a seepage hole is installed at the bottom of the molding cavity. The vibrator makes the slurry fully adhere to the cavity, and the scraper removes the excess slurry so that the top of the slurry is flush with the top of the molding cavity.

[0076] Set the thickness of the molding cavity to 3-10cm and the height to 20-70cm. When the solid mixture inside the molding cavity has completely solidified and dried, remove the solid mixture from the molding cavity. Fix one end of the removed solid mixture at the top and expose the other end at the bottom. Control the distance of exposure of multiple solid mixtures to be the same and perform stamping measurements on each one.

[0077] Step S4: The solidified mixture is subjected to stamping measurement using a viscosity detection module to obtain the stamping value;

[0078] When stamping the mixture solid, the maximum instantaneous value at each stamping is obtained and defined as the stamping value. The obtained stamping values ​​are arranged in the order of stamping and sent to the data analysis module in sequence.

[0079] During the solid-mixture stamping process, the stamping contact surface is always in the same position. By marking the stamping surface at the same position in the solid-mixture mixture, the stamping surface and the stamping head of the stamping instrument are kept on the same straight line during each stamping.

[0080] Step S5: Analyze the obtained pollutant information and stamping values ​​through the data analysis module to determine the mixing ratio of fine sand and silty clay.

[0081] The data analysis module receives pollutant percentage values ​​and stamping values. It establishes a Cartesian coordinate system with time as the x-axis and numerical magnitude as the y-axis. The acquired pollutant percentage and stamping values ​​are marked with corresponding points on the Cartesian coordinate system in chronological order; these points are defined as marker points. A smooth curve connects two points representing the pollutant percentage values, designated as the first curve, and a smooth curve connects two points representing the stamping values, designated as the second curve. The data analysis module performs analysis based on the first and second curves. The specific analysis steps are as follows:

[0082] Step S51: Observe the rise and fall of the first curve and the second curve, select the positions of the highest and lowest points of the first curve corresponding to the marked points of the second curve, obtain the values ​​of the highest and lowest points of the first curve, obtain the values ​​of the corresponding marked points of the second curve, and calculate the difference between the value of the corresponding marked point of the second curve and the highest and lowest points of the first curve. Set the difference of the highest point of the first curve as: WRCmax, and the difference of the lowest point as: WRCmin.

[0083] Step S52: Observe the rise and fall of the first curve and the second curve, select the positions of the highest and lowest points of the second curve corresponding to the marked points of the first curve, obtain the values ​​of the highest and lowest points of the second curve, obtain the values ​​of the corresponding marked points of the first curve, and calculate the differences between the values ​​of the highest and lowest points of the second curve and the corresponding marked points of the first curve. Set the difference of the highest point of the second curve as CYCmax and the difference of the lowest point as CYCmin.

[0084] Step S53: Observe the farthest distance between the first curve and the second curve, obtain the position of the corresponding mark point, calculate the difference between the corresponding mark point of the second curve and the corresponding mark point of the first curve, and set the difference value as: QXCZmax;

[0085] Step S64: Obtain the calculated difference information, compare the values ​​of WRCmax, WRCmin, CYCmax, CYCmin, and QXCZmax, arrange them in ascending order, and select the median value; obtain the marker point of the median value on the first and second curves, and determine that the mixing and pressing effect at the marker point is qualified and the pollutant ratio is qualified; obtain the marker point of QXCZmax on the first and second curves, and determine that the mixing and pressing effect at the marker point is the best and the pollutant ratio is the smallest. The mixing and pressing requirements are met between the median value and the QXCZmax value, and the optimal mixing ratio of fine sand and silty clay is determined.

[0086] In this invention, a method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines is described in the following specific steps during the mixture detection:

[0087] First, the fine sand and silty clay produced by the earth pressure shield tunneling were weighed.

[0088] During the weighing process, different amounts of silty clay and different amounts of fine sand are weighed separately, so that the total number of silty clay and fine sand weighed is n.

[0089] The weight is obtained by the information acquisition module and the total weight is kept the same when weighing at different ratios. The mixture is mixed according to the weighing ratio by the mixing module, and a certain amount of aqueous solution is injected into the mixture to form a thick slurry. The information of pollutants in the thick slurry is obtained.

[0090] During mixing, the symmetrically weighed silty clay and fine sand are mixed after obtaining the symmetrical weights. The volume of the injected aqueous solution is set as Vs; the weight is set as Mgs; and the weight of the concentrated slurry is set as NJMGz. The aqueous solution with a volume of Vs is injected into the mixture and stirred to form a concentrated slurry. The weight of the mixture is measured, and the information acquisition module obtains the weighed weight as S. The weight of the concentrated slurry is calculated as: NJMGz = Mgs + S.

[0091] When acquiring contaminants in concentrated slurry, the volume of the mixed slurry in the measuring instrument is measured, and the measurement volume is set as Vcltj; contaminant information is obtained based on the calculated weight and the measured volume.

[0092] A concentrated slurry with a volume of Vcyg is obtained through a sampling tube. The weight of the concentrated slurry extracted by the sampling tube is measured based on the volume of the mixed slurry and the weight of the concentrated slurry. The sampling weight is set as Mcczl.

[0093] A concentrated slurry with a weight of Mcczl was spread out, dried, and the emitted gas components were obtained. The concentration of pollutants in the gas was obtained. It was set that there were 'a' emitted gas components and 'b' pollutant gas components. The volume of each gas component was set as Vqt, and the gas density was set as DUQTMDz. The density of the first gas was DUQTMDz1; the density of the second gas was DUQTMDz2; the density of the third gas was DUQTMDz3; ... the density of the bth gas was DUQTMDzb; ... the density of the ath gas was DUQTMDza.

[0094] The proportion of pollutant gas weight to the total gas component weight is calculated; the mass proportion value is set to: QTZBz; the pollutant proportion value in the concentrated slurry is calculated based on the obtained mass proportion value; the pollutant proportion value is set to: WRWzb; different proportions of silty clay and fine sand are weighed by the weighing module to obtain multiple pollutant proportion values, and the pollutant proportion values ​​are sent to the data analysis module.

[0095] Select multiple molding cavities, mark the mixing ratio on the molding cavities, pour the concentrated slurry into the molding cavities and vibrate, let it air dry naturally, and remove it after it has completely solidified.

[0096] Pour the mixed slurry into the molding cavity in chronological order to fill the cavity.

[0097] When the slurry is poured into the molding cavity, a vibrator is installed on the surface of the molding cavity and a seepage hole is installed at the bottom of the molding cavity. The vibrator makes the slurry fully adhere to the cavity, and the scraper makes the top of the slurry flush with the top of the molding cavity.

[0098] Set the thickness of the molding cavity to 6cm and the height to 40cm. Once the mixture inside the molding cavity has completely solidified and dried, remove the mixture from the molding cavity.

[0099] The solidified mixture is subjected to stamping measurement by a viscosity detection module to obtain stamping values; the obtained contaminant information and stamping values ​​are analyzed by a data analysis module to determine the mixing ratio of fine sand and silty clay.

[0100] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for detecting a mixture of fine sand and silty clay in earth pressure shield tunneling machines, characterized in that, The detection method includes a weighing module, an information acquisition module, a mixing module, a viscosity detection module, a data analysis module, and a server. The specific steps are as follows: Step S1: The weighing module is controlled by the server to weigh the fine sand and silty clay generated by the earth pressure shield tunneling machine in different proportions. Step S2: Obtain the weight by measuring the weight through the information acquisition module; Step S3: The fine sand and silty clay are mixed sequentially according to different weighing ratios using the mixing module. A certain amount of aqueous solution is injected into the mixture to form a thick slurry. Information on pollutants in the thick slurry is obtained. Several molding cavities are selected, the mixing ratio of the mixture is marked, the thick slurry is poured into the molding cavity and vibrated, and then allowed to air dry naturally until it is completely solidified before being removed. Step S4: The solidified mixture is subjected to stamping measurement using a viscosity detection module to obtain the stamping value; Step S5: Analyze the acquired pollutant information and stamping values ​​through the data analysis module, calculate the pollutant percentage based on the pollutant information, and determine the most suitable mixing ratio of fine sand and silty clay based on the stamping values. In step S5, the data analysis module receives the pollutant percentage value and the stamping value, and establishes a Cartesian coordinate system with time as the x-axis and the value magnitude as the y-axis. The acquired pollutant percentage value and stamping value are marked with corresponding points on the Cartesian coordinate system in chronological order, defined as marker points. Two points representing the pollutant percentage value are smoothly connected by a curve, defined as the first curve; two points representing the stamping value are also smoothly connected by a curve, defined as the second curve. The data analysis module performs analysis based on the first and second curves. The specific analysis steps for the first and second curves are as follows: Step S51: Observe the rise and fall of the first curve and the second curve, and select the positions of the highest and lowest points of the first curve corresponding to the marked points of the second curve; obtain the values ​​of the highest and lowest points of the first curve, and obtain the values ​​of the corresponding marked points of the second curve; calculate the difference between the value of the corresponding marked point of the second curve and the highest and lowest points of the first curve, and set the difference of the highest point of the first curve as: WRCmax; the difference of the lowest point of the first curve as: WRCmin; Step S52: Observe the rise and fall of the first curve and the second curve, and select the positions of the highest and lowest points of the second curve corresponding to the marked points of the first curve; obtain the values ​​of the highest and lowest points of the second curve, and obtain the values ​​of the corresponding marked points of the first curve; calculate the differences between the highest and lowest points of the second curve and the corresponding marked points of the first curve, and set the difference of the highest point of the second curve as CYCmax; the difference of the lowest point of the second curve as CYCmin. Step S53: Observe the farthest distance between the first curve and the second curve, and obtain the position of the corresponding marker point; calculate the difference between the corresponding marker point of the second curve and the corresponding marker point of the first curve, and set the difference value as: QXCZmax; Step S54: Obtain the calculated difference information, compare the values ​​of WRCmax, WRCmin, CYCmax, CYCmin, and QXCZmax, arrange them in ascending order, and select the median value; obtain the marker point of the median value on the first and second curves, and determine whether the mixing and pressing effect at the marker point is qualified and whether the pollutant ratio is qualified; obtain the marker point of QXCZmax on the first and second curves, and determine whether the mixing and pressing effect at the marker point is the best and whether the pollutant ratio is the smallest, and whether the mixing and pressing requirements are met between the median value and the QXCZmax value, and determine the optimal mixing ratio of fine sand and silty clay.

2. The method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines according to claim 1, characterized in that, In step S1, the specific steps for weighing fine sand and silty clay are as follows; Step S11: Select the total weighing parts of silty clay and fine sand as n, and the total weighing mass as S. For different proportions of mixtures, keep the total weighing parts n and the total weighing mass S constant. Step S12: Select 1 part of silty clay and n-1 parts of fine sand for weighing. The weight of 1 part of silty clay is: The weight of n-1 parts of fine sand is The measured weight is then transmitted to the information acquisition module; Weigh 2 parts of silty clay and n-2 parts of fine sand. The weight of the 2 parts of silty clay is: The weight of n-2 parts of fine sand is The measured weight is then transmitted to the information acquisition module; Weigh 3 parts of silty clay and n-3 parts of fine sand. The weight of the 3 parts of silty clay is: The weight of n-3 parts of fine sand is The measured weight is then transmitted to the information acquisition module; …… Weigh n-1 parts of silty clay and 1 part of fine sand to obtain the weight of n-1 parts of silty clay: One portion of fine sand weighs as follows: The measured weight is then transmitted to the information acquisition module.

3. The method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines according to claim 2, characterized in that, First, the tunnel boring machine's excavated soil needs to be collected and crushed to separate the fine sand and silty clay from the excavated soil, and then the two materials need to be weighed.

4. The method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines according to claim 1, characterized in that, In step S2, the information acquisition module arranges the symmetrical quantities of silty clay and fine sand in chronological order.

5. The method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines according to claim 1, characterized in that, In step S3, the mixing module mixes the weighed silty clay and fine sand after the information acquisition module obtains the weighing weight. When mixing the concentrated slurry, the volume of the injected aqueous solution is set to Vs; the weight is set to Mgs; and the weight of the concentrated slurry is set to NJMGz. The aqueous solution with a volume of Vs is injected into the mixture of fine sand and silty clay and mixed to form a concentrated slurry. The weight of the mixture is obtained as S from the information acquisition module. The weights of the aqueous solution and the concentrated slurry are calculated respectively. When acquiring contaminants in concentrated slurry, the volume of the mixed slurry in the measuring instrument is measured, and the measurement volume is set as Vcltj; contaminant information is obtained based on the calculated weight information and the measurement volume.

6. The method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines according to claim 5, characterized in that, The concentrated slurry was extracted using a sampling tube, with the extraction volume set as Vcyg and the weight as Mcczl. A concentrated slurry with a weight of Mcczl was spread out, dried, and the emitted gas components were obtained. The concentration of pollutants in the gas was measured. It was assumed that there were 'a' emitted gas components and 'b' pollutant gas components. The volume of each gas component was set to Vqt, and the gas density was set to DUQTMDz. The first gas density was DUQTMDz1; the second gas density was DUQTMDz2; the third gas density was DUQTMDz3… the density of the bth gas was DUQTMDzb… the density of the ath gas was DUQTMDza. The proportion of pollutant gas weight to the total weight of all gas components is calculated, and the mass proportion value is set as: QTZBz; the proportion of pollutants in the concentrated slurry is obtained based on the mass proportion value, and the pollutant proportion value is set as: WRWzb; Weigh fine sand and silty clay with different proportions using the weighing module to obtain multiple pollutant percentage values, and then send these pollutant percentage values ​​to the data analysis module.

7. The method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines according to claim 6, characterized in that, After obtaining the information on the contaminants in the slurry, a certain volume of cement is added to the slurry and mixed evenly. The mixed slurry is then injected into the molding cavity. When mixing cement, a certain volume of aqueous solution is first added to the cement and stirred to form a cement slurry. The mixed cement slurry is then poured into a thick slurry and stirred to ensure that the cement slurry is fully mixed in the thick slurry.

8. The method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines according to claim 1, characterized in that, In step S3, the number of molding cavities is set to n, and the volume of the cavity is smaller than the volume of the mixture of silty clay and fine sand. The slurry after mixing is poured into the molding cavity in the order of time so that the molding cavity is filled. When the slurry is poured into the molding cavity, a vibrator is installed on the surface of the molding cavity and a seepage hole is installed at the bottom of the molding cavity. The vibrator makes the slurry fully adhere to the cavity, and the scraper makes the top of the slurry flush with the top of the molding cavity. Set the thickness of the molding cavity to 3-10cm and the height to 20-70cm. When the solid mixture inside the molding cavity has completely solidified and dried, remove the solid mixture from the molding cavity. Fix one end of the removed solid mixture at the top and expose the other end at the bottom. Control the distance of exposure of multiple solid mixtures to be the same and perform stamping measurements on each one.

9. The method for detecting the mixture of fine sand and silty clay in earth pressure shield tunneling machines according to claim 8, characterized in that, In step S4, when the mixture solid is stamped, the maximum instantaneous value at each stamping is obtained and defined as the stamping value; the obtained stamping values ​​are arranged in the order of stamping and sent to the data analysis module in sequence. During the solid-mixture stamping process, the stamping contact surface is always in the same position. By marking the stamping surface at the same position of the solid-mixture mixture, the stamping surface and the stamping head of the stamping instrument are kept in the same straight line during each stamping.

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