CN113049452A - Device and method for measuring and controlling diffusion range of cement-based grout in grouting of covering layer - Google Patents
Device and method for measuring and controlling diffusion range of cement-based grout in grouting of covering layer Download PDFInfo
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Abstract
The invention discloses a device and a method for measuring and controlling the diffusion range of cement-based grout in grouting of a covering layer, which relate to the technical field of grouting engineering, and the device comprises: the multiple groups of pH electrodes are respectively arranged in the corresponding monitoring holes and are used for acquiring the pH values of multiple coordinate positions in each monitoring hole in real time; the pH data acquisition instrument is connected with the plurality of groups of pH electrodes and is used for acquiring the pH value sent by each pH electrode in real time; and the slurry diffusion data management system is connected with the pH data acquisition instrument and is used for processing the pH value sent by the pH data acquisition instrument in real time, determining the slurry diffusion position and drawing a cement-based slurry diffusion range profile map at any moment according to the slurry diffusion position. The invention can realize effective monitoring of the diffusion range of the cement-based grout in the grouting process of various covering layers.
Description
Technical Field
The invention relates to the technical field of grouting engineering, in particular to a device and a method for measuring and controlling the diffusion range of cement-based slurry in grouting of a covering layer.
Background
The covering layer is widely distributed in China, and a plurality of dam foundations are built on the covering layer foundation. Due to special regional conditions and complex cause types, the engineering properties of the fourth-family overlay layer in different regions of China are greatly different. For example, in the southwest region with rich water energy resources in China, the covering layer mainly comprises floating gravel, broken stone, fine sand and the like, has the characteristics of loose structure, large particles, strong water permeability and the like, in the Chinese and western region with relative drought in China, the covering layer mainly comprises new loess which is newly accumulated till the new loess which is later updated, has the characteristics of loose soil texture structure, low strength, large deformation, self-weight collapse and the like, and in the coastal region in the east of China, the covering layer mainly comprises silt clay, silt, silty clay and the like which are deposited as causes by the fourth system of the holonew sea, and has the characteristics of high water content, weak permeability, high compressibility, low strength and the like.
When the bearing capacity, deformation performance or impermeability of the fourth series covering layer foundation cannot meet the requirements of normal use and safety and stability of the engineering structure, technical measures adaptive to the geological conditions of the covering layer and the characteristics of the building need to be taken to treat the covering layer foundation so as to improve the bearing capacity and the deformation and impermeability of the covering layer foundation.
Grouting is applied to anti-seepage reinforcement treatment of the foundation of the covering layer. Compared with other methods, the cement-based grouting has the following advantages: 1. the cement-based slurry has wide source and low price; 2. after the grout is poured and combined with a corresponding foundation, stone body grout veins with certain strength can be formed, so that the mechanical and osmotic properties of the foundation are improved; 3. the construction machinery and the process are simple, the field requirement is low, and the interference to nearby buildings and stratums is small; 4. can be widely applied to covering layers such as gravel, broken stone, sandy soil, plain filling soil, miscellaneous filling soil and the like.
In the cement grouting process, the diffusion process and the diffusion range of grout under the action of grouting pressure show larger difference along with different properties of a covering layer foundation, and the filling condition of cement-based grout in a region to be treated directly determines the grouting treatment effect, so the measurement and control of the diffusion range of the cement-based grout have very important significance for grouting engineering and are mainly embodied in the following three aspects: 1. the reliability and the rationality of grouting parameter design are improved, the design of grouting parameters at the present stage still depends on engineering experience to a great extent, the grouting amount and the grouting pressure are used as the control standard of the grouting process, and sometimes, although the consumption of the grout is large, the grout can be diffused too far to a relatively loose weak area along pores in a stratum and the purpose of covering layer treatment can not be achieved. If the measurement and control of the diffusion range of the cement-based slurry are realized, the reliability and rationality of grouting parameter design can be improved; 2. the evaluation method has certain hysteresis, and cannot quantitatively evaluate the expansion and occurrence conditions of cement-based grout in time, so that grouting parameters can be adjusted and optimized in time; 3. the method has the advantages that the cost and the construction period of the field grouting test are saved, a large number of field tests are required in the actual grouting project, the grouting parameters meeting the project requirements can be finally determined, the project investment can be increased through the field tests, the construction period is prolonged, the field grouting test can be usually cancelled for projects with short construction periods, the grouting construction is directly carried out, and finally, the foundation treatment effect is poor due to unreasonable design of the grouting parameters, or the grout is diffused too far, so that unnecessary waste is caused. Therefore, the measurement and control of the diffusion range of the cement-based grout can improve the reliability and rationality of grouting parameter design, increase the pertinence of grouting effect evaluation, further greatly reduce the workload of field tests, and save the cost and the construction period.
The research on the cement grouting theory in the porous medium of the covering layer is seriously lagged, the grouting theory deduced based on fluid mechanics, solid mechanics and the like is not completely applicable, and the diffusion range parameters of the cement-based grout under the conditions of corresponding stratum and grouting pressure cannot be obtained through theoretical calculation at present. The grouting engineering belongs to concealed engineering, and due to the lack of an effective monitoring method or a testing means for the diffusion range of the cement-based grout, the monitoring of the grouting process is limited to the monitoring of grouting pressure, grouting amount, foundation or building deformation and the like, the diffusion characteristic parameters of the grout after entering a covering layer are not monitored in the actual grouting construction process, and the diffusion range and the filling condition of the cement-based grout cannot be obtained.
According to research literature, the current monitoring of the diffusion range of the slurry is mainly based on monitoring of the temperature and the pressure of the slurry. The diffusion range of the grout is monitored based on the grout temperature monitoring diffusion range, namely, the diffusion range of the grout is monitored by utilizing the seepage and temperature conduction characteristics of the grout, temperature measuring points are arranged on a grouting area and a grouting boundary to test and feed back the diffusion range of the grout, and the problem of measuring the diffusion range of the grout in hidden engineering is solved, for example, the invention patent of China Water conservancy and hydropower science research institute ' is a monitoring device and a method for the diffusion process of the grout in gravel layer cement grouting, and the invention patent of China mining university ' is a measurement and control method for the diffusion range of the grout in rock and soil mass '. The main problems of monitoring the diffusion range based on the slurry temperature are the need of using high-temperature cement-based slurry for grouting and the difference of the temperature conduction characteristics of different types of covering layers. The high-temperature cement-based slurry has the advantages that basic characteristics such as apparent viscosity, fluidity and setting time of the cement-based slurry are greatly different at different temperatures, so that the difference of the diffusion rule of the high-temperature cement-based slurry and the diffusion rule of the conventional cement-based slurry is large, and the representativeness of the diffusion rule of the conventional cement-based slurry is poor on the basis of the monitoring result and the research result of the diffusion rule of the high-temperature cement-based slurry; in addition, the temperature loss is serious in the cement-based slurry diffusion process, and for covering layers with poor permeability, the temperature sensor preset in a grouting area has unobvious change, so that the slurry diffusion range is difficult to effectively monitor.
The grouting pressure-based monitoring is that the grouting pressure conduction characteristic or the damage effect of pressure on surrounding rocks is utilized to monitor the diffusion range of grout, pressure sensors are arranged on a grouting area and a grouting boundary or a high-sensitivity detector of a microseismic technology is utilized to test and feed back the diffusion range of the grouting grout, for example, the microseismic monitoring technology based on the grouting pressure damage effect in the invention patent 'space diffusion range and path description method of grouting grout in Hebei coal science research institute of drilling and grouting'. The monitoring method has the basic principle that high-pressure grout has the effects of flushing, expanding, splitting, breaking rocks and the like in an original fracture of an aquifer, a series of micro-seismic events are induced manually, the time-space change rule of the micro-seismic events is monitored and analyzed, and the diffusion range and the diffusion path of the grouting grout are determined. The method is mainly suitable for monitoring the grouting diffusion range of the surrounding rock cracks, and the measurement and control of the grouting slurry diffusion range of the cement of the covering layer are not suitable due to the fact that the covering layer porous medium and the surrounding rock cracks have large difference in grouting pressure conduction and slurry diffusion mechanisms.
In conclusion, the existing slurry diffusion measurement and control technology is difficult to realize effective monitoring of the diffusion range of cement-based slurry in the grouting process of various covering layers.
Disclosure of Invention
The invention aims to provide a device and a method for measuring and controlling the diffusion range of cement-based grout in grouting of a covering layer, which can effectively monitor the diffusion range of the cement-based grout in the grouting process of various covering layers.
In order to achieve the purpose, the invention provides the following scheme:
a cement-based slurry diffusion range measurement and control device in overburden grouting, the device comprising:
the multiple groups of pH electrodes are respectively arranged in the corresponding monitoring holes and are used for acquiring the pH values of multiple coordinate positions in each monitoring hole in real time; each group of pH electrodes comprises a plurality of pH electrodes, and each pH electrode is sequentially and longitudinally arranged in the corresponding coordinate position in the monitoring hole; each pH electrode has a unique coordinate position; all the monitoring holes are uniformly distributed around the grouting holes;
the pH data acquisition instrument is connected with the multiple groups of pH electrodes and is used for acquiring the pH value sent by each pH electrode in real time;
and the slurry diffusion data management system is connected with the pH data acquisition instrument and is used for processing the pH value sent by the pH data acquisition instrument in real time, determining the slurry diffusion position and drawing a cement-based slurry diffusion range profile at any moment according to the slurry diffusion position.
Optionally, the slurry diffusion data management system specifically includes:
the pH electrode information acquisition module is used for acquiring the coordinate position of each pH electrode;
and the data processing and analyzing module is respectively connected with the pH electrode information acquisition module and the pH data acquisition instrument and is used for processing the pH value sent by the pH data acquisition instrument in real time, determining the slurry diffusion position according to the coordinate position sent by the pH electrode information acquisition module and drawing a cement-based slurry diffusion range profile at any moment according to the slurry diffusion position.
Optionally, the slurry diffusion data management system further comprises:
and the graph display module is connected with the data processing and analyzing module and is used for displaying the cement-based slurry diffusion range profile in the covering layer grouting process in real time.
Optionally, each set of said pH electrodes comprises at least 3 of said pH electrodes;
when each group of the pH electrodes comprises 3 pH electrodes, the 3 pH electrodes are respectively arranged at the top of the grouting monitoring section, the middle of the grouting monitoring section and the bottom of the grouting monitoring section; the grouting monitoring section is a section of the monitoring hole; the top of the grouting monitoring section and the top of the grouting section are positioned on the same horizontal line; the bottom of the grout monitoring section is lower than the bottom of the grout section.
Optionally, each pH electrode in each group of pH electrodes is sequentially and longitudinally arranged on a pH electrode fixing rod; the pH electrode fixing rod is fixed in the grouting monitoring section.
Optionally, a sleeve is arranged in each monitoring hole; the pH electrode fixing rod is fixed in the sleeve; the sleeve is used for preventing the hole wall of the monitoring hole from collapsing.
Optionally, the casing is a grouting perforated pipe or a plastic drainage blind pipe.
Optionally, each monitoring hole is uniformly arranged around the grouting hole in a ring shape.
The invention also provides the following scheme:
a method for measuring and controlling the diffusion range of cement-based grout in grouting of an overburden layer, which comprises the following steps:
obtaining a first pH value; the first pH value is the pH value of each coordinate position at the current moment;
obtaining a second pH value; the second pH value is the pH value of each coordinate position at the last moment;
respectively calculating the pH change value of each coordinate position according to each coordinate position; the pH change value is the difference between the second pH value and the first pH value;
judging whether the pH change value is in a mutation range;
if so, determining the coordinate position corresponding to the pH change value as a slurry diffusion position, and drawing a cement-based slurry diffusion range profile map at the current moment according to the slurry diffusion position;
and if not, determining the coordinate position corresponding to the pH change value as the position where the slurry is not diffused.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a device and a method for measuring and controlling the diffusion range of cement-based grout in grouting of a covering layer, which utilize the high pH value characteristic of the conventional cement-based grout and pH electrodes preset at different coordinate positions in the covering layer to judge the diffusion condition of the grout in the covering layer through pH value mutation, realize the effective monitoring of the diffusion range of the cement-based grout in the grouting process of various covering layers, have simple and convenient test method, reliable results and low cost, can directly reflect the diffusion rule of the grout, do not change the characteristic of the grout, have high reliability of the monitoring results, and are suitable for the application of field grouting engineering.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of an embodiment of a device for measuring and controlling the diffusion range of a cement-based slurry in grouting of a covering layer according to the present invention;
FIG. 2 is a schematic view of the arrangement of a diffusion range measurement and control plane of the cement-based slurry according to the present invention;
FIG. 3 is a schematic flow chart of an embodiment of a method for measuring and controlling the diffusion range of a cement-based slurry in grouting of an overburden according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a device and a method for measuring and controlling the diffusion range of cement-based grout in grouting of a covering layer, which can effectively monitor the diffusion range of the cement-based grout in the grouting process of various covering layers.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of an embodiment of a device for measuring and controlling the diffusion range of cement-based slurry in grouting of a covering layer. Referring to fig. 1, the device for measuring and controlling the diffusion range of cement-based grout in grouting of a covering layer comprises a plurality of groups of pH electrodes 5, a pH data acquisition instrument 9 and a grout diffusion data management system 10.
The multiple groups of pH electrodes 5 are respectively arranged in the corresponding monitoring holes 3, and the multiple groups of pH electrodes 5 are used for acquiring the pH values of multiple coordinate positions in each monitoring hole 3 in real time; each group of pH electrodes 5 comprises a plurality of pH electrodes 5, and each pH electrode 5 is longitudinally arranged in the corresponding coordinate position in the monitoring hole 3 in sequence; each pH electrode 5 has a unique coordinate position; all monitoring holes 3 are uniformly distributed around the grouting hole 2, and covering layer same-sequence advanced holes can be used as the monitoring holes 3. The monitoring holes 3 are uniformly arranged around the grouting hole 2 in a ring shape, as shown in fig. 2. The pH electrode 5 can be a wired or wireless pH electrode, such as PhG-21D in Reye industry.
Each set of pH electrodes 5 comprises at least 3 pH electrodes 5; when each group of pH electrodes 5 comprises 3 pH electrodes 5, the 3 pH electrodes 5 are respectively arranged at the top of the grouting monitoring section, the middle of the grouting monitoring section and the bottom of the grouting monitoring section; the grouting monitoring section is a section of the monitoring hole 3; the top of the grouting monitoring section and the top of the grouting section 8 are positioned on the same horizontal line; the bottom of the grout monitoring section is lower than the bottom of the grout section 8. The grouting section 8 is a section of the grouting hole 2.
Each pH electrode 5 in each group of pH electrodes 5 is sequentially and longitudinally arranged on a pH electrode fixing rod 6; the pH electrode fixing rod 6 is fixed in the grouting monitoring section.
A sleeve 4 is arranged in each monitoring hole 3; the pH electrode fixing rod 6 is fixed in the sleeve 4; the sleeve 4 is used to prevent the wall of the monitoring hole 3 from collapsing. The casing 4 is a grouting perforated pipe or a plastic drainage blind pipe, so that the cement-based slurry filtrate can smoothly enter the monitoring hole 3.
The pH data acquisition instrument 9 is connected with the plurality of groups of pH electrodes 5, and the pH data acquisition instrument 9 is used for acquiring the pH value sent by each pH electrode 5 in real time. The pH data collector 9 is also used for storing the pH value sent by each pH electrode 5.
The slurry diffusion data management system 10 is connected with the pH data acquisition instrument 9, and the slurry diffusion data management system 10 is used for processing the pH value sent by the pH data acquisition instrument 9 in real time, determining the slurry diffusion position and drawing a cement-based slurry diffusion range profile at any moment according to the slurry diffusion position.
The slurry diffusion data management system 10 specifically comprises a pH electrode information acquisition module, a data processing and analyzing module, and a graph display module.
The pH electrode information acquisition module is used for acquiring the coordinate position of each pH electrode 5.
The data processing and analyzing module is respectively connected with the pH electrode information acquisition module and the pH data acquisition instrument 9, and is used for processing the pH value sent by the pH data acquisition instrument 9 in real time, determining the slurry diffusion position according to the coordinate position sent by the pH electrode information acquisition module, and drawing a cement-based slurry diffusion range profile at any moment according to the slurry diffusion position.
The graph display module is connected with the data processing and analyzing module and used for displaying a cement-based slurry diffusion range profile diagram in the grouting process of the covering layer 1 in real time.
The concrete process flow for measuring and controlling the diffusion range of the cement-based grout in the grouting of the covering layer 1 by using the device for measuring and controlling the diffusion range of the cement-based grout in the grouting of the covering layer comprises the following steps:
(1) according to the engineering property, the corresponding specification and the engineering experience of the covering layer 1 to be processed, grouting parameters such as grouting pressure, grouting amount, the length of the grouting section 8, the row spacing of the grouting holes 2, the hole depth of the grouting holes 2, the aperture of the grouting holes 2, the length of the grouting section 8 and the like are preliminarily determined.
(2) And (2) constructing grouting holes 2 in the area to be grouted according to the grouting parameters designed in the step (1), arranging and constructing a plurality of monitoring holes 3 around the grouting holes 2 in an annular mode, and protecting the wall by using a sleeve 4.
The aperture of the monitoring hole 3 is smaller than that of the grouting hole 2, and the depth of the monitoring hole 3 is the same as that of the grouting hole 2; the arrangement distance, the row spacing and the number of the monitoring holes 3 are determined by the precision of slurry diffusion range monitoring and construction requirements; in the embodiment, the pitch of the monitoring holes 3 is 0.5 m-1.5 m, and the row pitch is more than 0.5 m.
During construction, the steel sleeve is firstly adopted to follow the pipe protection wall, after the construction is finished, the sleeve 4 is placed in the steel sleeve, then the steel sleeve is pulled out, and the sleeve 4 is used for protecting the wall. The external diameter of sleeve pipe 4 is less than the internal diameter of steel sleeve pipe, guarantees that sleeve pipe 4 can transfer smoothly to the bottom of monitoring hole 3, and the internal diameter of sleeve pipe 4 satisfies pH electrode 5 and transfers smoothly to the requirement of monitoring the degree of depth.
(3) Lay pH electrode 5 along the depth direction in the sleeve pipe 4 in monitoring hole 3, adopt pH electrode dead lever 6 to fix and transfer pH electrode 5 to the design depth, pH electrode 5 can adopt wired or wireless transmission pH value, can transmit pH value in real time, the quantity of the pH electrode 5 that the length that corresponds grout section 8 in every monitoring hole 3 was laid can be confirmed according to precision and the construction needs that the thick liquid diffusion scope was monitored, but at least need 3, lay respectively at the top of grout section 8, the middle part of grout section 8 and be less than the corresponding depth position in bottom of grout section 8.
The pH electrode 5 can be bound on the corresponding position of the pH electrode fixing rod 6 through an iron wire, a binding belt and the like; the pH electrode fixing rod 6 is a thin steel bar with threads at two ends, each section is 1.5-2.0 m in length, and can be connected through a connecting screw cap 7 to be extended to a required length; the pH electrode 5 is lowered to the designed position, and the top of the pH electrode fixing rod 6 is fixed at the central position of the monitoring hole 3, so that the pH electrode 5 is prevented from swinging.
(4) And establishing a space Cartesian rectangular coordinate system by taking the bottom center of the grouting hole 2 as the origin of coordinates, determining the coordinate position of each pH electrode 5 and numbering the pH electrodes respectively. The coordinate position of each pH electrode 5 corresponds to a unique number.
(5) And inputting the number information into a pH data acquisition instrument 9, and measuring and storing the pH value of the corresponding coordinate position of each monitoring hole 3 in real time. The sampling frequency of the pH electrode 5 is set to be more than or equal to 10 Hz.
(6) And inputting the serial number and the coordinate position information into the slurry diffusion data management system 10, wherein the slurry diffusion data management system 10 comprises a pH electrode information acquisition module, a data processing and analyzing module and a graph display module. The information of the coordinate position, the serial number and the like of the pH electrode 5 is recorded into the slurry diffusion data management system 10 through the pH electrode information acquisition module, the pH data acquisition instrument 9 is connected to the slurry diffusion data management system 10 in a wired or wireless mode, the acquired pH data is read through the data processing and analyzing module of the slurry diffusion data management system 10, the acquired pH data is analyzed on line, the slurry diffusion range is judged through the pH value mutation of the corresponding coordinate position, the diffusion range outline drawing of the cement-based slurry in the covering layer 1 at the corresponding moment is drawn, and the cement-based slurry is displayed in real time through the graph display module of the slurry diffusion data management system 10, so that the visualization of the diffusion range of the cement-based slurry in the concealed grouting engineering is realized.
(7) Connecting grouting pumps, grouting pipes and accessories in a grouting system 11, grouting into grouting holes 2 to form a grouting section 8, verifying and evaluating the rationality of primarily designed grouting parameters according to a grout diffusion range profile displayed in real time by a grout diffusion data management system 10 in the grouting process, and optimizing and adjusting grouting pressure, grouting amount, row spacing of grouting holes 2, depth of grouting holes 2, grouting time and the like until the grout diffusion range of a to-be-treated covering layer 1 meets the grouting setting requirement. The optimization and adjustment are carried out according to engineering experience and relevant standard regulations, such as grouting pressure, grouting amount, row spacing of grouting holes 2, depth of grouting holes 2, grouting time and the like.
(8) After the slurry diffusion monitoring process for the first grouting section 8 is completed, the pH electrode 5 is recovered and cleaned. The recycling of the pH electrode 5 is realized by disassembling the connecting screw cap 7, and the pH electrode 5 is cleaned by clean water and the water is sucked dry. Combining geological exploration data, repeating the step (3) to the next grouting section 8
(8) And the measurement and control of the diffusion range of the cement-based slurry of the covering layers with different engineering properties are completed.
(9) And after the diffusion monitoring process of all the covering layer cement-based slurry is finished, recovering and cleaning the pH electrode 5, and protecting by adopting a special soaking solution for later use.
FIG. 3 is a flow chart of an embodiment of a method for measuring and controlling the diffusion range of a cement-based slurry in grouting of an overburden according to the present invention. Referring to fig. 3, the method for measuring and controlling the diffusion range of the cement-based grout in the grouting of the covering layer comprises the following steps:
step 301: obtaining a first pH value; the first pH value is the pH value at each coordinate position at the current moment.
Step 302: obtaining a second pH value; the second pH is the pH at each coordinate position at the previous time.
Step 303: respectively calculating the pH change value at each coordinate position according to each coordinate position; the pH change is the difference between the second pH and the first pH.
Step 304: and judging whether the pH change value is in a mutation range.
If the output result of step 304 is yes, step 305 is executed: and determining the coordinate position corresponding to the pH change value as a slurry diffusion position, and drawing a cement-based slurry diffusion range profile at the current moment according to the slurry diffusion position.
If the output result of step 304 is no, go to step 306: and determining the coordinate position corresponding to the pH change value as the position of the slurry which is not diffused.
The invention discloses a device and a method for measuring and controlling the diffusion range of cement-based slurry in grouting of a covering layer, according to corresponding research results, common silicate cement slurry belongs to strong alkaline slurry, the pH value of the cement-based slurry is generally more than 12, and the diffusion range and the diffusion process of the slurry in various covering layers are measured and controlled by utilizing the basic attribute of the high pH value of the conventional cement-based slurry and the pH electrode preset in the covering layer. Determining and numbering the coordinate positions of each preset pH electrode, adopting the pH electrodes to measure the pH values at different coordinate positions in the grouting process in real time, inputting the numbering information of the pH electrodes into a pH data acquisition instrument, adopting the pH data acquisition instrument to receive and store the pH values of the corresponding coordinate positions of each monitoring hole according to a certain frequency, inputting the numbering information of the pH electrodes and the coordinate position information into a slurry diffusion data management system, adopting the slurry diffusion data management system to carry out online analysis on the pH data, judging the slurry diffusion range through the pH value mutation of the corresponding coordinate positions, drawing a diffusion range profile diagram of the slurry in a covering layer at the corresponding moment, realizing the visualization and monitoring of the diffusion process of the cement-based slurry in different covering layers, adjusting grouting control parameters and evaluating grouting effect in real time according to the slurry diffusion radius, and verifying and evaluating the rationality of preliminarily designed grouting parameters, the designed grouting parameters are optimized and adjusted, so that the diffusion range of the grout in the covering layer meets the grouting treatment requirement, and the aims of optimizing the designed grouting parameters and saving the workload of a field grouting test are fulfilled.
Furthermore, the invention can judge the diffusion condition of the grout in various covering layers by monitoring the change of the pH value at different coordinate positions in various covering layers, directly reflects the diffusion range of the grout, has simple and convenient monitoring method, intuitive and reliable result and low cost, can accurately judge the diffusion range of the grout, directly reflects the diffusion rule of the grout, does not change the characteristics of the grout, reduces the number of inspection holes, optimizes grouting parameters and is suitable for field grouting engineering application.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. The utility model provides a cement base thick liquid diffusion range measurement and control device in overburden grouting which characterized in that, the device includes:
the multiple groups of pH electrodes are respectively arranged in the corresponding monitoring holes and are used for acquiring the pH values of multiple coordinate positions in each monitoring hole in real time; each group of pH electrodes comprises a plurality of pH electrodes, and each pH electrode is sequentially and longitudinally arranged in the corresponding coordinate position in the monitoring hole; each pH electrode has a unique coordinate position; all the monitoring holes are uniformly distributed around the grouting holes;
the pH data acquisition instrument is connected with the multiple groups of pH electrodes and is used for acquiring the pH value sent by each pH electrode in real time;
and the slurry diffusion data management system is connected with the pH data acquisition instrument and is used for processing the pH value sent by the pH data acquisition instrument in real time, determining the slurry diffusion position and drawing a cement-based slurry diffusion range profile at any moment according to the slurry diffusion position.
2. The device for measuring and controlling the diffusion range of cement-based grout in grouting of a cover layer according to claim 1, wherein the grout diffusion data management system specifically comprises:
the pH electrode information acquisition module is used for acquiring the coordinate position of each pH electrode;
and the data processing and analyzing module is respectively connected with the pH electrode information acquisition module and the pH data acquisition instrument and is used for processing the pH value sent by the pH data acquisition instrument in real time, determining the slurry diffusion position according to the coordinate position sent by the pH electrode information acquisition module and drawing a cement-based slurry diffusion range profile at any moment according to the slurry diffusion position.
3. The apparatus as claimed in claim 2, wherein the system for managing data of grout spread comprises:
and the graph display module is connected with the data processing and analyzing module and is used for displaying the cement-based slurry diffusion range profile in the covering layer grouting process in real time.
4. The apparatus as claimed in claim 1, wherein each group of said pH electrodes comprises at least 3 pH electrodes;
when each group of the pH electrodes comprises 3 pH electrodes, the 3 pH electrodes are respectively arranged at the top of the grouting monitoring section, the middle of the grouting monitoring section and the bottom of the grouting monitoring section; the grouting monitoring section is a section of the monitoring hole; the top of the grouting monitoring section and the top of the grouting section are positioned on the same horizontal line; the bottom of the grout monitoring section is lower than the bottom of the grout section.
5. The apparatus as claimed in claim 4, wherein each of the pH electrodes of each group of pH electrodes is sequentially and longitudinally disposed on a pH electrode fixing rod; the pH electrode fixing rod is fixed in the grouting monitoring section.
6. The apparatus for measuring and controlling the extent of diffusion of a cement-based slurry in grouting of a cover according to claim 5, wherein a sleeve is disposed in each of said monitoring holes; the pH electrode fixing rod is fixed in the sleeve; the sleeve is used for preventing the hole wall of the monitoring hole from collapsing.
7. The device for measuring and controlling the diffusion range of cement-based grout in grouting of an overburden layer as claimed in claim 6, wherein the casing is a grouting perforated pipe or a plastic drainage blind pipe.
8. The apparatus as claimed in claim 1, wherein the monitoring holes are uniformly arranged around the grouting hole in a ring shape.
9. A method for measuring and controlling the diffusion range of a cement-based slurry in grouting of an overburden, the method being applied to the apparatus of any one of claims 1 to 8, the method comprising:
obtaining a first pH value; the first pH value is the pH value of each coordinate position at the current moment;
obtaining a second pH value; the second pH value is the pH value of each coordinate position at the last moment;
respectively calculating the pH change value of each coordinate position according to each coordinate position; the pH change value is the difference between the second pH value and the first pH value;
judging whether the pH change value is in a mutation range;
if so, determining the coordinate position corresponding to the pH change value as a slurry diffusion position, and drawing a cement-based slurry diffusion range profile map at the current moment according to the slurry diffusion position;
and if not, determining the coordinate position corresponding to the pH change value as the position where the slurry is not diffused.
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