Device and method for preparing cementitious body sample in flowing water environment

Abstract

The invention relates to the technical field of engineering material preparation, and discloses a device and a method for preparing a cementitious body sample in a dynamic water environment. According to the device for preparing the cementing body sample in the flowing water environment, the sensing units are arranged in the to-be-poured rockfill body in a layered manner, so that the filling state data of pores at different depths in the to-be-poured rockfill body can be acquired in real time, the permeation track and the distribution characteristics of a cementing material can be accurately captured, and the visual module is arranged, so that the operation of the cementing body sample preparation in the flowing water environment is facilitated. A visual pore filling thermodynamic diagram can be generated based on data obtained in real time, the permeation path, the filling uniformity and the pore distribution of the cementing material in the rockfill body can be visually presented, and real-time monitoring is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering material preparation, in particular to a cemented body sample preparation device and method under a dynamic water environment. BACKGROUND

[0002] As a new type of mass construction material, the core of rock-filled concrete is to combine aggregate and self-compacting cementing material to form an integral structure. With its core advantages of low hydration heat, high impermeability and strong environmental adaptability, it has broad development prospects in complex engineering fields such as water conservancy and marine engineering.

[0003] As the core load transfer unit of composite materials such as rock-filled concrete, the mechanical properties and interface characteristics of the cemented body directly determine the performance of the overall structure.

[0004] However, the existing cemented body preparation device does not have real-time monitoring capability for filling effect, which makes it impossible to obtain key structural feature information inside the cemented body, such as pore distribution, which directly affects the strength of the cemented rock mass, during the pouring process. It is difficult to accurately control the morphology, size and spatial distribution of the cemented area (i.e. effective cemented body), making the prepared sample insufficient in standardization, and seriously restricting reliable experimental research on cemented rock mass. SUMMARY

[0005] Therefore, the present application provides a cemented body sample preparation device and method under a dynamic water environment to solve the problem that the existing cemented body preparation device does not have real-time monitoring capability for filling effect, which makes it impossible to obtain key structural feature information inside the cemented body in real time during the pouring process.

[0006] In a first aspect, the present application provides a cemented body sample preparation device under a dynamic water environment, comprising a shell, a support plate platform, a to-be-poured rock mass, a pouring component, a plurality of sensing units and a visualization module. The shell is internally provided with a pouring chamber; the support plate platform is fixedly installed in the pouring chamber; the to-be-poured rock mass is located inside the pouring chamber, and the to-be-poured rock mass is arranged on the support plate platform; the pouring component is installed on the shell, and the pouring component is arranged above the to-be-poured rock mass, and the pouring component is used to guide the cementing material to the to-be-poured rock mass; a plurality of sensing units are arranged in layers along the pouring direction inside the to-be-poured rock mass, and at least one sensing unit is arranged in each layer; the visualization module is in communication connection with the sensing unit through a data transmission module, and is used to display the filling image of the pores inside the to-be-poured rock mass in real time based on the data detected by the sensing unit.

[0007] Beneficial effects: By arranging multiple sensing units in layers in the to-be-poured rockfill body, the pore filling state data of different depths in the to-be-poured rockfill body can be collected in real time, and the penetration trajectory and distribution characteristics of the cementing material can be accurately captured. By setting a visualization module, an intuitive pore filling heat map can be generated based on the real-time data, and the penetration path, filling uniformity and pore distribution of the cementing material in the rockfill body can be intuitively presented, and real-time monitoring can be realized. At the same time, based on the real-time display of the pore filling heat map, the operator can determine whether the current pouring state meets the expectation, dynamically adjust the pouring parameters, actively intervene in the filling process, ensure uniform filling of the cementing material in the rockfill body gap, reduce the porosity, reduce the invalid cementing or weak area, and significantly improve the mechanical properties and structural stability of the sample. Again, through visual feedback and data-based adjustment, the cementing body samples prepared by different batches and different operators can be ensured to have consistent key structural characteristics. In addition, multi-parameter independent regulation and full-dimensional data acquisition are realized, which provides experimental data for establishing the correlation model of cementing morphology and mechanical properties, and facilitates the systematic study of the influence law of dynamic hydraulic load and multi-physical field action on the mechanical properties of the cementing body.

[0008] In an alternative embodiment, the shell further comprises a water inlet and a water outlet, both of which communicate with the pouring chamber; along the water flow direction, the to-be-poured rockfill body is arranged between the water inlet and the water outlet; the cementing body sample preparation device in a dynamic water environment further comprises a flowmeter, which is installed inside the pouring chamber and used to detect the flow rate of the water flow inside the pouring chamber.

[0009] Beneficial effects: The setting of the water inlet and the water outlet enables the formation of a stable water flow circulation system inside the pouring chamber, accurately simulates the complex working conditions such as water flow scouring, dilution and seepage pressure that the cementing material faces in actual engineering, is closer to the real application scene, overcomes the limitation that the traditional method is difficult to stably reproduce the dynamic water conditions in the laboratory, and provides a reliable and repeatable experimental platform for studying the influence of dynamic water on the penetration and filling behavior of cementing material. At the same time, by setting the flowmeter, the water flow speed inside the pouring chamber can be monitored in real time to ensure that the flow speed of the dynamic water environment meets the preset conditions, the influence of the pouring process and the water flow on the cementing material can be observed in real time, and the pouring quality and the visualization of the test are ensured.

[0010] In an alternative embodiment, the cementing body sample preparation device in a dynamic water environment further comprises a ring-shaped electromagnet group, which is installed inside the shell and used to heat the temperature inside the pouring chamber to a set target temperature.

[0011] Beneficial effects: The annular electromagnet group rapidly and accurately raises the temperature inside the pouring chamber to the target temperature through electromagnetic induction, which helps to form a uniform temperature field inside the pouring chamber, ensures that the cementitious material synchronously and fully hydrates and solidifies in the gaps between the aggregates, and improves the internal stress, micro-cracks, and uneven strength development of the cementitious body caused by temperature gradient or local low temperature, thereby significantly improving the overall strength, density, and homogeneity of the final cementitious body.

[0012] In an alternative embodiment, the water inlet and the water outlet are connected by a circulating pipe; the dynamic water environment cementitious body sample preparation device further comprises a regulating valve and a circulating water pump, the regulating valve is installed at the water outlet; and the circulating water pump is installed at the circulating pipe.

[0013] In a second aspect, the present application provides a dynamic water environment cementitious body sample preparation method, which is applied to the dynamic water environment cementitious body sample preparation provided in the first aspect. The preparation method comprises the following steps: preparing a cementitious body sample preparation device; stacking blocks on a pouring platform to form a to-be-poured rockfill body; embedding a plurality of sensing units in a spatial array form inside the to-be-poured rockfill body along a pouring direction; arranging a dynamic water environment inside the shell so that the water surface is higher than the rockfill surface; adjusting the discharge port of the pouring element to a specified position, and pouring the mixed concrete into the to-be-poured rockfill body; obtaining resistivity data of a fixed sampling frequency in real time through the sensing units, and forming a pore filling thermal map; completing curing, and measuring and analyzing sample parameters.

[0014] Beneficial effects: By arranging a dynamic water environment inside the shell so that the water surface is higher than the rockfill surface, the key working conditions of the cementitious material pouring, permeating, and solidifying in the flowing water in the actual project are accurately simulated, the experimental results can better reflect the performance of the material under the real service conditions, and the limitations of the traditional static water or water-free environment for preparing the sample are overcome. By embedding a plurality of sensing units in a spatial array form inside the rockfill body and obtaining resistivity data of a fixed sampling frequency in real time, the dynamic, in-situ, and non-destructive monitoring of the filling process of the cementitious material in the rockfill pores is realized. The resistivity data is converted into a visual thermal map, which intuitively and quantitatively shows the three-dimensional spatial distribution state, flow path, filling uniformity, and variation law over time of the slurry inside the rockfill body.

[0015] In an alternative embodiment, the step of obtaining resistivity data of a fixed sampling frequency in real time through the sensing units to form a pore filling thermal map comprises the following steps: generating a preliminary pore filling thermal map based on the resistivity data; achieving spatial registration of the surface flow pattern and the internal sensing data through image feature matching; and generating a pore filling image in real time.

[0016] Beneficial effects: Through the resistivity thermogram, the hidden filling state is converted into a visual spatial image, enabling researchers to observe the three-dimensional penetration path and filling progress of the cementing material inside the rockfill body in real time. At the same time, the abnormally high resistance area appearing in the thermogram can correspond to the unfilled cavity, slurry flow area or segregation zone, enabling the operator to discover filling defects in the pouring process and immediately adjust the pouring parameters, target intervention in the weak filling area, save the amount of cementing material and shorten the curing period, and improve the uniformity and integrity of the sample.

[0017] In an alternative embodiment, the pouring direction is the height direction; wherein the position of one sensing unit serves as the pouring center and is centrally installed on the top of the rockfill body to be poured and located directly below the discharge port of the pouring device.

[0018] Beneficial effects: By controlling the pouring direction to be the height direction, the cementing material can naturally penetrate along the internal pores of the rockfill body under the action of gravity. By positioning one sensing unit at the center of the top of the rockfill body to be poured and accurately aligning it with the discharge port of the pouring device, the cementing material can uniformly spread from the center to the periphery, which helps to uniformly fill the internal pores of the rockfill body and improve the uniformity of the internal cementing structure.

[0019] In an alternative embodiment, the cement, aggregate and fly ash are mixed using a mixing device to obtain mixed concrete.

[0020] In an alternative embodiment, the curing process includes: starting the annular electromagnet group to preliminarily cure the rockfill body after pouring at a set target temperature; after preliminary curing, stripping the un-cemented stone parts around and taking out the large block with good cementation in the center for further curing.

[0021] In an alternative embodiment, in the process of generating the pore filling image in real time, the unfilled area, transition area and densely filled area are distinguished.

[0022] Beneficial effects: By distinguishing the unfilled area, transition area and densely filled area, the operator can directly observe the expansion direction, filling rate and filling quality of the filling path, helping the operator to judge whether the process parameters need to be adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the following will briefly introduce the drawings needed in the specific embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0024] Figure 1 A front view structural schematic diagram of a cementing body sample preparation device under a dynamic water environment provided by an embodiment of the present application;

[0025] Figure 2 A front view structural schematic diagram of an induction unit arrangement in a cementing body sample preparation device under a dynamic water environment provided by an embodiment of the present application;

[0026] Figure 3 A top view structural schematic diagram of an induction unit arrangement in a cementing body sample preparation device under a dynamic water environment provided by an embodiment of the present application;

[0027] Figure 4 A side view structural schematic diagram of an induction unit arrangement in a cementing body sample preparation device under a dynamic water environment provided by an embodiment of the present application;

[0028] Figure 5 A flowchart of a cementing body sample preparation method under a dynamic water environment provided by an embodiment of the present application.

[0029] Legend of reference signs:

[0030] 1, shell; 101, pouring chamber; 102, water inlet; 103, water outlet;

[0031] 2, support platform;

[0032] 3, to-be-poured rockfill body;

[0033] 4, pouring member; 401, discharge port;

[0034] 5, induction unit;

[0035] 6, visualization module;

[0036] 7, data transmission module;

[0037] 8, flowmeter;

[0038] 9, annular electromagnet group;

[0039] 10, pouring guide pipe;

[0040] 11, platform hook;

[0041] 12, regulating valve;

[0042] 13, circulating water pump;

[0043] 14, pouring support;

[0044] K, water flow direction; M, pouring direction. DETAILED DESCRIPTION

[0045] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0046] In the description of the present application, it should be understood that the terms “center”, “upper”, “lower”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0047] In the description of the present application, unless otherwise specified, the meaning of “a plurality of” is two or more.

[0048] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms “mounting”, “connection”, “connection” should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] The embodiments of the present application will be described below with reference to Figures 1 to 5 .

[0050] According to the embodiments of the present application, in one aspect, a device for preparing a cemented body sample in a dynamic water environment is provided, as shown in Figure 1 , which comprises a shell 1, a support plate platform 2, a to-be-poured rockfill body 3, a pouring member 4, a plurality of sensing units 5 and a visualization module 6.

[0051] Specifically, the shell 1 is internally provided with a pouring chamber 101; the support plate platform 2 is fixedly installed in the pouring chamber 101; the to-be-poured rockfill body 3 is located inside the pouring chamber 101, and the to-be-poured rockfill body 3 is arranged on the support plate platform 2; the pouring member 4 is installed on the shell 1, and the discharge port 401 of the pouring member 4 is located above the to-be-poured rockfill body 3; the pouring member 4 is used for guiding the cementing material to the to-be-poured rockfill body 3; a plurality of sensing units 5 are arranged in layers along the pouring direction M inside the to-be-poured rockfill body 3, and at least one sensing unit 5 is arranged in each layer; the visualization module 6 is in communication connection with the sensing unit 5 through the data transmission module 7, and is used for displaying the filling image of the internal pore of the to-be-poured rockfill body 3 in real time based on the data detected by the sensing unit 5.

[0052] In this way, by arranging a plurality of sensing units 5 in layers inside the to-be-poured rockfill body 3, the pore filling state data (such as changes in resistivity, pressure, temperature, etc.) of different depths inside the to-be-poured rockfill body 3 can be collected in real time, and the penetration track and distribution characteristics of the cementing material can be accurately captured. In addition, by arranging the visualization module 6, an intuitive pore filling heat map can be generated based on the data acquired in real time, and the penetration path, filling uniformity and pore distribution of the cementing material in the rockfill body can be intuitively presented, thereby realizing real-time monitoring.

[0053] Meanwhile, based on the real-time displayed pore filling heat map, the operator can determine whether the current pouring state meets the expectation, dynamically adjust the pouring parameters (such as the cementing material flow, pressure or pouring height, pipe diameter), and actively intervene in the filling process, so as to ensure that the cementing material uniformly fills the rockfill body gap, reduces the porosity, reduces the invalid cementing or weak area, and significantly improves the mechanical properties (such as compressive strength, elastic modulus) and structural stability of the sample.

[0054] Thirdly, through the visual feedback and data-based adjustment, it can be ensured that the cementing body samples prepared by different batches and different operators are consistent in key structural characteristics (such as porosity distribution and cementing uniformity).

[0055] In addition, the independent regulation of multiple parameters and the full-dimensional data acquisition are realized, experimental data for establishing the correlation model of cementing morphology and mechanical properties are provided, and the influence law of dynamic hydraulic load and multi-physical field on the mechanical properties of the cementing body is facilitated.

[0056] It can be explained that, as shown in Figure 1 the discharge port 401 of the pouring member 4 is installed with a pouring guide pipe 10, and the distal end of the pouring guide pipe 10 extends to above the central area of the top of the to-be-poured rockfill body 3.

[0057] It can be explained that, as shown in Figure 1 a pair of platform hooks 11 are installed above the support plate platform 2.

[0058] It can be explained that, as shown inFigure 1 As shown in the drawings, a pouring support 14 is installed inside the pouring chamber 101 for fixing the pouring member 4, and the discharge port 401 of the pouring member 4 is located on the side of the pouring support 14 close to the rockfill body 3 to be poured.

[0059] It can be explained that in the present application, the inductive unit 5 collects the resistivity in real time, and the position of the flow front is determined based on the resistivity mutation characteristics.

[0060] Among them, the data transmission module 7 selects a wire, adopts IP68 protection level standard, and continuously samples at high frequency when starting, and synchronously records the resistivity baseline value. For example, the dry rock state is about 4010Ω·m.

[0061] It can be explained that in the present application, a flow pattern interpretation module is also provided, which is connected with the in-situ inductive unit 5 through a data line, and the processor executes the determination rule in real time to determine the flow and filling state of the cemented body at the corresponding point.

[0062] Among them, the filling state of the cementing material is determined according to the real-time data of the resistivity of the inductive unit 5: when the resistivity is less than or equal to 2200Ω·m, it is in the completely filled area, that is, the cementing material can completely wrap the inductive unit 5; when the resistivity is in the range of 2200 to 3000Ω·m, it is in the partially filled area, that is, the cementing material contacts but does not completely wrap the inductive unit 5; when the resistivity is greater than or equal to 3000Ω·m, it is in the unfilled area, that is, it does not contact the inductive unit 5.

[0063] The flow direction of the cementing material is determined according to the resistivity drop rate: longitudinal propagation: the response time difference of adjacent two layers of inductive units 5 is less than or equal to 3s; lateral diffusion: the response time difference of inductive units 5 in the same layer is less than or equal to 1.5s.

[0064] It can be explained that in the present application, the pre-embedding scheme of the plurality of inductive units 5 is not specifically limited.

[0065] That is, the number of layers of the plurality of inductive units 5 arranged in the vertical direction is not specifically limited. It can be one layer, two layers, three layers, four layers or more, and the number of inductive units 5 in each layer is determined according to specific needs.

[0066] As one of the embodiments, as shown in the drawings, the plurality of inductive units 5 are divided into three layers in the height direction, forming a three-layer space detection network for real-time monitoring of seepage conditions at different positions. Figure 2

[0067] The following upper, middle and bottom layers are provided with 7 inductive units 5 for illustrative purposes.

[0068] ​Specifically, the upper layer is arranged with 7 sensing units 5, respectively S1, S1, S12-S15, S20, S21; the middle layer is arranged with 7 sensing units 5, respectively S2, S8-S11, S18, S19; the bottom layer is arranged with 7 sensing units 5, respectively S3-S7, S16, S17.

[0069] Further, the layer spacing of the upper layer, the middle layer and the bottom layer is H1, such as 0.3m.

[0070] It can be explained that the horizontal arrangement of the above-mentioned sensing units 5 is not specifically limited.

[0071] As one of the embodiments, as shown in the figure, Figure 3 in the upper layer, the plurality of sensing units 5 are arranged in a cross shape with S1 as the center of the pouring point.

[0072] For example, as shown in the figure, Figure 2 S8, S9, S2, S10, S11 are arranged along the horizontal direction center line, the spacing between S9 and S2, the spacing between S2 and S10 are all H2, such as 0.2m, the spacing between S8 and S9, S10 and S11 are all H3, such as 0.3m.

[0073] Among them, in the upper layer, as shown in the figure, Figure 2 S12 and S15 are arranged on the two sides of the horizontal direction respectively, S13 is arranged between S12 and S1, S14 is arranged between S15 and S1, and S12, S13, S1, S14, S15 are arranged equidistantly.

[0074] Similarly, as shown in the figure, Figure 2 in the bottom layer, S4 and S7 are arranged on the two sides of the horizontal direction respectively, S5 is arranged between S4 and S3, S6 is arranged between S7 and S3, S4, S5, S3, S6, S7 are arranged equidistantly, and the spacing is H4, such as 0.325m.

[0075] Further, as shown in the figure, Figure 4 in the width direction, S16 and S17 are also arranged in the bottom layer, S18 and S19 are arranged in the middle layer, and S20 and S21 are arranged in the upper layer, the spacing between S16 and S3, the spacing between S20 and S1 are all H5, such as 0.65m, at this time S17 is located at the midpoint of S16 and S3, S21 is located at the midpoint of S20 and S1, the spacing between S18 and S19 is H6, such as 0.3m, and the spacing between S19 and S2 is H7, such as 0.2m.

[0076] In one embodiment, as shown in the figure, Figure 1As shown, the shell 1 also includes a water inlet 102 and a water outlet 103, both of which communicate with the pouring chamber 101; along the water flow direction K, the rockfill body to be poured 3 is arranged between the water inlet 102 and the water outlet 103; the cemented body sample preparation device in a dynamic water environment also includes a flowmeter 8 installed inside the pouring chamber 101 for detecting the water flow rate inside the pouring chamber 101.

[0077] In this way, the arrangement of the water inlet 102 and the water outlet 103 enables the formation of a stable water flow circulation system inside the pouring chamber 101, accurately simulates the complex working conditions such as water flow scouring, dilution and seepage pressure that the cementing material faces in actual engineering, is closer to the real application scenario, overcomes the limitation that the traditional method is difficult to stably reproduce the dynamic water conditions in the laboratory, and provides a reliable and repeatable experimental platform for studying the influence of dynamic water on the penetration and filling behavior of cementing material.

[0078] At the same time, by arranging the flowmeter 8, the water flow rate inside the pouring chamber 101 is monitored in real time, ensuring that the flow rate of the dynamic water environment meets the preset conditions (such as uniform flow rate or specific flow rate gradient), the influence of the pouring process and the water flow on the cementing material can be observed in real time, and the pouring quality and the visualization of the test are ensured.

[0079] It can be explained that the cemented body sample preparation device in a dynamic water environment also includes an adjusting valve and a circulating water pump, the adjusting valve is installed at the water outlet, the adjusting valve 12 is used to adjust the water outlet flow and flow rate, the water outlet 103 and the water inlet 102 are communicated through a circulating pipe, and the circulating water pump 13 is installed at the circulating pipe and is used to drive the water flow out of the water outlet 103 to flow back to the water inlet 102.

[0080] In one embodiment, as shown in Figure 1 The cemented body sample preparation device in a dynamic water environment also includes a ring-shaped electromagnet group 9 installed inside the shell 1 for heating the temperature inside the pouring chamber 101 to a set target temperature.

[0081] In this way, the ring-shaped electromagnet group 9 heats the internal environment of the pouring chamber 101 through electromagnetic induction principle, quickly and accurately raises the temperature inside the pouring chamber 101 and stabilizes it at the set target temperature, helps to form a uniform temperature field inside the pouring chamber 101, ensures that the cementing material simultaneously and sufficiently performs hydration and solidification reaction in the gap between the aggregates, improves the problems such as internal stress, micro-cracks or uneven strength development of the cemented body caused by temperature gradient or local low temperature, and thus significantly improves the overall strength, density and homogeneity of the final cemented body.

[0082] It can be explained that in the present application, a high-resolution industrial camera and 3D DasEarth modeling software are integrated to perform two-stage real-time analysis and visual presentation, constituting a spatial flow reconstruction system.

[0083] It can be explained that the cemented body sample preparation device under the dynamic water environment further comprises an infrared heating plate for adjusting the temperature of the pouring chamber 101.

[0084] The cemented body sample preparation under the dynamic water environment mentioned in the above embodiment is based on the multi-modal flow monitoring technology of the spatial array of the induction unit 5, that is, high-frequency sampling, to realize high-precision corresponding tracking of the penetration track of the cementing material under the dynamic water environment, and through the composite criterion of the resistivity gradient mutation threshold and the corresponding time difference, the high-precision spatial flow reconstruction mechanism can dynamically present a pore filling thermal map, thereby providing visual data support for the material flow characteristic research.

[0085] Meanwhile, multi-parameter independent regulation and full-dimensional data acquisition can be realized, experimental data for establishing the correlation model of cementation morphology and mechanical properties are provided, and the influence law of dynamic water load and multi-physical field action on the mechanical properties of the cemented body is conveniently studied.

[0086] In addition, it can also provide a low-cost pre-research means for offshore wind power pile protection, underwater dam repair and other engineering. That is, laboratory simulation can optimize the cementing material ratio and structure design, and reduce the number of field tests to save engineering cost.

[0087] According to the embodiment of the application, on the other hand, the cemented body sample preparation method under the dynamic water environment is provided and applied to the cemented body sample preparation under the dynamic water environment provided in the previous aspect.

[0088] As shown in Figure 5 The preparation method comprises the following steps: preparing a cemented body sample preparation device; stacking the blocks on the pouring platform to form a to-be-poured rockfill body 3; embedding a plurality of induction units 5 in the form of a spatial array inside the to-be-poured rockfill body 3 along the pouring direction M; arranging a dynamic water environment inside the shell 1, so that the water surface is higher than the rockfill surface; adjusting the discharge port 401 of the pouring element 4 to a specified position, pouring the mixed concrete into the to-be-poured rockfill body 3; acquiring resistivity data of a fixed sampling frequency in real time through the induction unit 5, and forming a pore filling thermal map, and an operator observes the cementation front position and lateral diffusion trend through the visual module 6; completing maintenance, and measuring and analyzing the sample parameters.

[0089] In this way, by arranging a dynamic water environment inside the shell 1, so that the water surface is higher than the rockfill surface, the key working conditions of the cementing material pouring, penetrating and solidifying in the flowing water in the actual engineering are accurately simulated, the experimental results can better reflect the performance of the material under the real service condition, and the limitations of the traditional static water or water-free environment for preparing the sample are overcome.

[0090] By arranging multiple sensing units 5 in the internal space of the rockfill body in an array and acquiring resistivity data at a fixed sampling frequency in real time, dynamic, in-situ and non-destructive monitoring of the filling process of the cementitious material in the rockfill pores is achieved. The resistivity data is converted into a visual thermal map, which intuitively and quantitatively shows the three-dimensional spatial distribution state, flow path, filling uniformity and variation law over time of the slurry in the internal space of the rockfill body.

[0091] It can be explained that when preparing the cementitious body sample preparation device, the rockfill, sand, water, cement, gravel, fly ash, water reducing agent, underwater protective agent and other materials are prepared at the same time.

[0092] It can be explained that each sensing unit 5 is connected to the data transmission module 7 through a waterproof joint.

[0093] It can be explained that when the water surface is higher than the rockfill surface, the circulating water pump 13 is started, the water flow velocity in the pouring chamber 101 is adjusted through the adjusting valve 12, the water flow velocity is stabilized, and the flowmeter 8 is read at the same time.

[0094] In one embodiment, the step of forming a pore filling thermal map by the sensing unit 5 acquiring resistivity data at a fixed sampling frequency in real time includes: generating a preliminary pore filling thermal map based on the resistivity data; achieving surface flow pattern and internal sensing data spatial registration through image feature matching; and generating a pore filling image in real time.

[0095] In this way, by means of the resistivity thermal map, the hidden filling state is converted into a visual spatial image, so that researchers can observe the three-dimensional penetration path and filling progress of the cementitious material in the internal space of the rockfill body in real time.

[0096] At the same time, the abnormally high resistance area appearing in the thermal map can correspond to the unfilled cavity, slurry flow area or segregation zone, so that the operator can immediately find the filling defects during the pouring process, and by combining the real-time image, the pouring parameters (such as moving the pouring point, adjusting the grouting pressure / speed, changing the slurry rheological property) can be immediately adjusted to intervene in the weak filling area, save the amount of cementitious material, shorten the curing period, and improve the uniformity and integrity of the sample.

[0097] In one embodiment, the pouring direction M is the height direction; one of the sensing units 5 is arranged as the pouring center and is centrally installed on the top of the rockfill body 3 to be poured and is located directly below the discharge port 401 of the pouring member 4.

[0098] In this way, by controlling the pouring direction M to be the height direction, the filling process of the cementitious material in the rockfill pores is monitored in the vertical direction, and the filling state of the rockfill body 3 is observed in the vertical direction. Figure 1In the vertical direction shown, the cementing material can be naturally infiltrated along the internal pores of the rockfill body by the action of gravity, and by locating one of the sensing units 5 at the center of the top of the rockfill body 3 to be poured and precisely aligning the discharge port 401 of the pouring member 4, the cementing material can be uniformly spread from the center to the periphery, which helps to uniformly fill the internal pores of the rockfill body and improve the uniformity of the internal cementing structure.

[0099] In one embodiment, the cement, aggregate and fly ash are mixed using a stirring device to obtain mixed concrete.

[0100] As one of the embodiments, the rockfill body sample is prepared using underwater self-protecting concrete. The flow velocity at the pouring point is 1 m / s. The rockfill is limestone with a particle size of 15-20 cm; the concrete coarse aggregate has a particle size of 5-10 mm; the underwater protective agent has a concentration of 0.01%; the concrete mix ratio is that, per cubic meter, cement: fly ash: sand: stone: water is 220 kg: 343 kg: 781 kg: 740 kg: 181 kg, and the volume water-powder ratio is 0.8; the poured concrete volume is 60 L; the amount of high-efficiency water reducing agent is adjusted so that the concrete slump spread is 400 mm; the height of the formed cementing body after pouring is 60.3 cm; and the bottom surface diameter is 99.5 cm.

[0101] As a second embodiment, the rockfill body sample is prepared using underwater self-protecting concrete. The flow velocity at the pouring point is 1 m / s. The rockfill is limestone with a particle size of 15-20 cm; the concrete coarse aggregate has a particle size of 5-10 mm; the underwater protective agent has a concentration of 0.01%; the concrete mix ratio is that, per cubic meter, cement: fly ash: sand: stone: water is 220 kg: 343 kg: 781 kg: 740 kg: 181 kg, and the volume water-powder ratio is 0.8; the poured concrete volume is 60 L; the amount of high-efficiency water reducing agent is adjusted so that the concrete slump spread is 500 mm; the height of the formed cementing body after pouring is 50.9 cm; and the bottom surface diameter is 100.0 cm.

[0102] As a third embodiment, the rockfill body sample is prepared using underwater self-protecting concrete, and the flow velocity at the pouring point is 1 m / s. The rockfill is limestone with a particle size of 15-20 cm; the concrete coarse aggregate has a particle size of 5-10 mm; the underwater protective agent has a concentration of 0.01%; the concrete mix ratio is that, per cubic meter, cement: fly ash: sand: stone: water is 220 kg: 343 kg: 781 kg: 740 kg: 181 kg, and the volume water-powder ratio is 0.8; the poured concrete volume is 60 L; the amount of high-efficiency water reducing agent is adjusted so that the concrete slump spread is 600 mm; the height of the formed cementing body after pouring is 49.7 cm; and the bottom surface diameter is 94.7 cm.

[0103] As a fourth embodiment, a rockfill sample is prepared using underwater self-protection concrete, a pouring point water flow rate is 1 m / s, and the rockfill is limestone with a particle size of 15-20 cm; the concrete coarse aggregate particle size is 5-10 mm; the underwater protective agent concentration is 0.01%; the concrete mix ratio is that, per cubic meter, cement: fly ash: sand: stone: water is 220 kg: 343 kg: 781 kg: 740 kg: 181 kg, the volume water-powder ratio is 0.8, the pouring concrete volume is 60 L, the amount of superplasticizer is adjusted so that the concrete slump spread is 700 mm, and the formed cementing body after pouring has a height of 58.5 cm and a bottom surface diameter of 107.0 cm.

[0104] After the samples poured and formed in the above four embodiments are placed in 45°C water for 10 days, the cementing morphology and mass volume are measured based on a comprehensive measurement and analysis system for cementing morphology, as shown in Table 1, and numerical simulation methods are combined to provide a reference basis for material selection for structured cementing engineering.

[0105] Table 1 visual measurement results

[0106]

[0107] D1 is the cementing depth of 20 cm, and D2 is the cementing depth of 40 cm.

[0108] In one embodiment, a flat plate ballast test is used to test the bearing capacity of the cemented block under different working conditions, and the strength of the block is obtained.

[0109] In one embodiment, a water-reducing agent is added during the mixing of the concrete, and the target slump spread is ensured by spread measurement.

[0110] In this way, the water-reducing agent is adsorbed on the surface of the cement particles, generating electrostatic repulsion and steric hindrance effects, significantly reducing the viscosity of the concrete, and achieving better fluidity of the mixture without increasing the amount of water. By accurately measuring the slump spread, the amount of water-reducing agent can be dynamically adjusted to achieve the target flow state of the concrete.

[0111] In one embodiment, in the process of generating a pore filling image in real time, the unfilled area, the transition area, and the densely filled area are distinguished.

[0112] In this way, by distinguishing the unfilled area, the transition area, and the densely filled area, the operator can directly observe the expansion direction, the filling rate, and the filling quality of the filling path, helping the operator to judge whether to adjust the process parameters (such as pressure, flow rate, etc.).

[0113] It can be explained that the unfilled area keeps the initial rock skeleton model; the transition area is rendered with a semi-transparent material, and the densely filled area is rendered with a solid model superimposed with flow trajectory lines.

[0114] It can be explained that the maintenance process includes: starting the annular electromagnet group 9 and the infrared heating plate, and performing preliminary maintenance on the completed rockfill body at a set target temperature, and the maintenance time is preferably 24 hours; after the maintenance is completed, the uncemented block stone part around is stripped, the center well-cemented block body is taken out, and further maintenance is performed.

[0115] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A device for preparing a cement sample in a dynamic water environment, characterized in that: include: A shell (1) is provided with a casting chamber (101) therein; A support plate platform (2) is fixedly mounted on the casting chamber (101); The rockfill body (3) to be cast is located inside the casting chamber (101), and the rockfill body (3) to be cast is arranged on the support plate platform (2); A casting part (4) is mounted on the shell (1), wherein the discharge port (401) of the casting part (4) is located above the rockfill body (3) to be cast, and the casting part (4) is used to guide the cementing material to the rockfill body (3) to be cast; A plurality of sensing units (5) are arranged in layers along a casting direction (M) inside the rockfill body (3) to be cast, with at least one sensing unit (5) being arranged in each layer; The visualization module (6) is connected to the sensing unit (5) through the data transmission module (7) for displaying in real time the filling image of the internal pores of the rockfill body (3) to be cast based on the data detected by the sensing unit (5).

2. The device for preparing cement sample under dynamic water environment according to claim 1, characterized in that: The housing (1) further comprises a water inlet (102) and a water outlet (103), wherein both the water inlet (102) and the water outlet (103) are in communication with the casting chamber (101); Along the water flow direction (K), the rockfill body (3) to be cast is arranged between the water inlet (102) and the water outlet (103); The device for preparing a colloid sample under a dynamic water environment further comprises: The flow meter (8) is installed inside the casting chamber (101) and is used to detect the flow rate of water inside the casting chamber (101).

3. The device for preparing cement sample under dynamic water environment according to claim 2, characterized in that: The water inlet (102) and the water outlet (103) are connected via a circulation pipe; The device for preparing a colloid sample under a dynamic water environment further comprises: a regulating valve (12), the regulating valve being installed at the water outlet (103); A circulating water pump (13) is installed on the circulating pipe.

4. The device for preparing a cement sample under a dynamic water environment according to any one of claims 1 to 3, characterized in that: The device for preparing a colloid sample under a dynamic water environment further comprises: The annular electromagnet group (9) is installed inside the housing (1) and is used to heat the internal temperature of the casting chamber (101) to a set target temperature.

5. A method for preparing a cement sample under a dynamic water environment, which is applied to the preparation of a cement sample under a dynamic water environment according to any one of claims 1 to 4, characterized in that: The preparation method comprises: Prepare the cement sample preparation device; Pile up rocks on the pouring platform to form a rockfill body to be poured (3); Pre-embedding a plurality of sensing units (5) in the form of a spatial array inside the rockfill body (3) to be cast along the casting direction (M); Turn on the circulating water pump to form a dynamic water environment inside the shell (1) so that the water level is higher than the rock pile surface; Adjusting the discharge port (401) of the casting part (4) to a designated position, and pouring the mixed concrete into the rockfill body (3) to be cast; Obtaining resistivity data of a fixed sampling frequency in real time through a sensing unit (5) and forming a pore filling thermal map; Complete curing and perform sample parameter measurement and analysis.

6. The method for preparing a cemented body sample under a dynamic water environment according to claim 5, characterized in that: The steps of acquiring resistivity data of a fixed sampling frequency in real time through the sensing unit (5) and forming a pore filling thermal map include: Generate preliminary pore-fill thermal maps based on resistivity data; The surface flow morphology and internal sensor data are spatially aligned through image feature matching; Generate pore-filling images in real time.

7. The method for preparing a cemented body sample under a dynamic water environment according to claim 5, characterized in that: The pouring direction (M) is the height direction; One of the sensing units (5) is located as the pouring center, centrally installed on the top of the rockfill body (3) to be poured, and is located directly below the discharge port (401) of the pouring piece (4).

8. The method for preparing a cemented body sample under a dynamic water environment according to any one of claims 5 to 7, characterized in that: Cement, aggregate and fly ash are mixed using a mixing device to obtain mixed concrete.

9. The method for preparing a cemented body sample under a dynamic water environment according to any one of claims 5 to 7, characterized in that: The curing process includes: starting the annular electromagnet group (9) to perform preliminary curing on the cast rockfill body at a set target temperature; after completing the preliminary curing, peeling off the unbonded block parts around the periphery, taking out the well-bonded large block in the center, and further curing it.

10. The method for preparing a cemented body sample under a dynamic water environment according to any one of claims 5 to 7, characterized in that: During the real-time generation of pore-filling images, unfilled areas, transition areas, and densely filled areas are distinguished.

Images