An intelligent grouting method for overburden separation

Abstract

The present invention discloses an intelligent grouting method for overburden separation layers, comprising the following steps: (1) Survey the overburden separation layer situation on site to determine the range of the overburden separation layer area that needs to be strengthened by grouting; (2) Set multiple grouting holes within the area range and accurately detect the core grouting position of the overburden separation layer; (3) Prepare the first grouting material; (4) Use the first grouting material to perform intelligent grouting of the overburden separation layer through an intelligent grouting device, and set up an automatic monitoring system for real-time dynamic monitoring; (5) After the grouting is completed, remove the intelligent grouting device, seal the grouting holes, and retain the automatic monitoring system to conduct post-grouting strength monitoring of the overburden separation layer; (6) Prepare the second grouting material. If it is detected that the overburden separation layer after grouting needs to be reinforced, set up reinforcement perfusion holes and perfusion the second grouting material to ensure that the strength of the overburden separation layer meets the design requirements. The present invention has a high degree of automation and greatly improves the construction efficiency and quality.

Description

Technical Field

[0001] The present invention relates to the technical field of rock stratum grouting construction control, and in particular to an intelligent grouting method for overburden separation layer. Background Art

[0002] At present, one of the most effective methods to control surface subsidence in coal mining is overburden separation grouting, and overburden separation grouting technology is gaining more and more attention. However, the existing separation grouting method also has the following defects: 1) The grouting concentration cannot be accurately controlled. The grouting concentration control relies entirely on manual experience to first conduct sampling and testing, and then adjust it by controlling the addition ratio of raw materials and water; 2) The grouting pressure parameter is an extremely important parameter in overburden isolation grouting. The original data collection relies on manual inspection and recording, which has a lag in the real-time grouting parameter adjustment and is not conducive to the later data collation and project data analysis; 3) All grouting operations rely on manpower, and the labor intensity of workers is high; 4) Most grouting pipes are high-pressure pipes and are randomly laid on the road surface. The laying length is long. During the grouting process, the grouting pressure is high and they are often crushed by heavy vehicles, resulting in pipe bursts, causing accidental injuries to pedestrians.

[0003] Therefore, it is very necessary to invent an intelligent grouting process for controlling surface subsidence that is easy to operate, highly efficient and highly precise. Summary of the Invention

[0004] To address the shortcomings of the prior art, the present invention provides an intelligent grouting method for overburden delamination. This method is simple to operate, enables intelligent grouting under complex geological conditions, and has a high degree of automation. It can significantly increase the grouting speed for overburden delamination, resulting in high construction efficiency and guaranteed construction quality.

[0005] To achieve the above object, the present invention provides an intelligent grouting method for overburden separation layer, comprising the following steps:

[0006] (1) Survey the overburden separation conditions at the site and determine the area of the overburden separation that requires grouting reinforcement;

[0007] (2) setting a plurality of grouting holes within the area and accurately detecting the grouting core position of the overburden separation layer; injecting water into each grouting hole in turn, and setting a fluid pressure detector in the hole, and determining the main core grouting hole as the grouting core position based on the fluid pressure data detected by the fluid pressure detector;

[0008] (3) preparing a first grouting material; the first grouting material comprises the following components: cement, epoxy acrylic resin, p-xylene, ethanol, tannic acid, 2-hydroxyethyl methacrylate, mineral oil, machine-made sand, polyethylene latex, bentonite, anhydrous aluminum sulfate, and limestone particles;

[0009] (4) Adopt the first grouting material, carry out intelligent grouting for the separated strata in the overlying rock through an intelligent grouting device, and set up an automatic monitoring system for real-time dynamic monitoring; among them, the intelligent grouting ensures that the grouting pressure in the core grouting hole is higher than that in the non-core grouting holes other than the core grouting hole, and adjusts the grouting pressure in each grouting hole at any time;

[0010] (5) After the grouting is completed, remove the intelligent grouting device, seal the grouting holes, and retain the automatic monitoring system to conduct post-grouting strength monitoring on the separated strata in the overlying rock;

[0011] (6) Prepare the second grouting material. If it is detected that the separated strata in the overlying rock after grouting need to be reinforced, set up reinforcement perfusion holes and perfusion the second grouting material to ensure that the strength of the separated strata in the overlying rock meets the design requirements.

[0012] Preferably, in the step (1), it includes taking rock samples of the strata, determining the lithology, thickness and distribution of soft rock strata of the separated strata in the overlying rock; further detecting the crack distribution of the separated strata in the overlying rock; analyzing based on the sampling results and detection results to determine the range of the area to be grouted; taking borehole samples and jointly using an ultrasonic detection device and a stress induction device for detection.

[0013] Preferably in any of the above solutions, in the step (2), when injecting water into each grouting hole in sequence, the other grouting holes are temporarily sealed. After injecting water into each grouting hole for 12 - 15 minutes, turn on the fluid pressure detector in the hole and continue injecting water; read the pressure reading of the fluid pressure detector every 3 minutes; after 3 - 5 readings, if the change range of the pressure reading during this period does not exceed 10% of the first reading, then this grouting hole is the core grouting hole.

[0014] Preferably in any of the above solutions, in the step (3), the weight parts of the components are: 150 - 170 of cement, 30 - 50 of epoxy acrylate resin, 10 - 12 of p-xylene, 25 - 35 of ethanol, 8 - 10 of tannic acid, 8 - 10 of 2-hydroxyethyl methacrylate, 5 - 6 of mineral oil, 50 - 60 of manufactured sand, 7 - 9 of polyvinyl latex, 3 - 5 of bentonite, 3 - 5 of anhydrous aluminum sulfate, 70 - 80 of limestone particles.

[0015] Preferably in any of the above solutions, in the step (3), the particle size of the manufactured sand is 1 - 1.5 mm, the particle size of the bentonite is 5 - 8 mm, and the particle size of the limestone particles is 15 - 18 mm.

[0016] Preferably, in any of the above solutions, in the step (4), the method of intelligent grouting is as follows: grouting into multiple grouting holes simultaneously, monitoring the grouting pressure in each grouting hole by an automatic monitoring system, and feeding back the collected information to the control module of the intelligent grouting device; the control module adjusts the grouting pressure in each grouting hole at any time according to the monitored information to keep their respective grouting pressures until the grouting ends.

[0017] Preferably, in any of the above solutions, in the step (4), the intelligent grouting device is provided with a flow detection module at the orifice of each grouting hole. After continuously grouting in each grouting hole for 1 - 1.5 h, the flow detection module is turned on to monitor the flow rate of the first grouting material flowing through each grouting hole; if there is no change in the flow rate after monitoring for 10 min, it indicates that the grouting in each grouting hole is full, and then the grouting ends.

[0018] Preferably, in any of the above solutions, in the steps (4) and (5), the automatic monitoring system is arranged around the grouting holes and real - time monitoring is carried out by using a fiber optic sensing device.

[0019] Preferably, in any of the above solutions, in the step (6), the second grouting material includes the following components in parts by weight: 140 - 150 of cement, 50 - 70 of epoxy acrylate resin, 8 - 10 of phenylmethane, 25 - 35 of ethanol, 10 - 12 of stearic acid, 50 - 60 of manufactured sand, 8 - 10 of bentonite, 3 - 5 of anhydrous aluminum sulfate, 70 - 80 of limestone particles.

[0020] Preferably, in any of the above solutions, in the step (6), the particle size of the manufactured sand is 2 - 3 mm, the particle size of the bentonite is 5 - 8 mm, and the particle size of the limestone particles is 20 - 25 mm.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The method of the present invention is simple to operate, realizes intelligent grouting under complex geological conditions, has a high degree of automation, can greatly improve the grouting speed for overlying strata separation, has high construction efficiency, and can ensure the construction efficiency and quality.

[0023] 2. The method of the present invention accurately determines the range of the overlying strata separation area that needs to be strengthened by grouting, so as to be able to carry out effective grouting reinforcement, reasonably arrange the reinforcement form and grouting position, and improve the reinforcement effect and construction efficiency.

[0024] 3. In the present invention, the range of the overlying strata separation area that needs to be strengthened by grouting is first determined, then the grouting core position of the overlying strata separation is accurately detected, and the most reasonable grouting position is judged. The construction quality control is more precise, the unnecessary grouting volume is reduced, the construction cost is greatly reduced, and the construction efficiency is improved.

[0025] 4. The intelligent grouting method of the present invention achieves intelligent grouting effects by real-time monitoring and control of each grouting hole, and greatly improves the construction safety. At the same time, through various means of monitoring and control, the grouting accuracy is improved, and the same set of automatic monitoring system is used for real-time monitoring during and after grouting, greatly reducing the construction cost and complexity. Such a setting is not recorded in the prior art. In addition, different grouting materials are used for grouting or reinforcement, which is more targeted and accurate, and can significantly improve the construction quality. Detailed implementation manners

[0026] The technical solutions of the present application will be described in detail below in combination with the specific implementation manners of the present application. However, the following embodiments are only used to understand the present invention. The embodiments in the present application and the features in the embodiments can be combined with each other. The present application can be implemented in many different ways defined and covered by the claims.

[0027] Embodiment 1

[0028] An intelligent grouting method for overlying strata separation includes the following steps:

[0029] (1) Survey the overlying strata separation situation on site to determine the range of the overlying strata separation area that needs to be strengthened by grouting;

[0030] (2) Set multiple grouting holes within the said area, and accurately detect the core grouting position of the overlying strata separation; Inject water into each grouting hole in turn, and set a fluid pressure detector in the hole. Determine the main core grouting holes based on the fluid pressure data detected by the fluid pressure detector as the said core grouting position;

[0031] (3) Prepare the first grouting material; The first grouting material includes the following components: cement, epoxy acrylate resin, p-xylene, ethanol, tannic acid, 2-hydroxyethyl methacrylate, mineral oil, manufactured sand, polyvinyl latex, bentonite, anhydrous aluminum sulfate, limestone particles;

[0032] (4) Use the first grouting material to carry out intelligent grouting of the overlying strata separation through an intelligent grouting device, and set up an automatic monitoring system for real-time dynamic monitoring; Among them, intelligent grouting ensures that the grouting pressure in the said core grouting hole is higher than the pressure in the non-core grouting holes other than the core grouting hole, and adjusts the grouting pressure in each grouting hole at any time;

[0033] (5) After the grouting is completed, remove the intelligent grouting device, seal the grouting holes, and retain the automatic monitoring system to conduct post-grouting strength monitoring on the overlying strata separation;

[0034] (6) Configure the second grouting material. When it is necessary to reinforce the separated strata in the overlying rock after grouting is monitored, set up reinforcement grouting holes and grout the second grouting material to ensure that the strength of the separated strata in the overlying rock meets the design requirements.

[0035] In the step (1), it includes taking samples of the rock strata to determine the lithology, thickness of the separated strata in the overlying rock, and the distribution of soft rock strata; further detecting the crack distribution of the separated strata in the overlying rock; analyzing based on the sampling results and detection results to determine the scope of the area to be grouted; taking borehole samples and using an ultrasonic detection device and a stress induction device in cooperation for detection.

[0036] In the step (2), when injecting water into each grouting hole in sequence, other grouting holes are temporarily sealed. After injecting water into each grouting hole for 15 minutes, turn on the fluid pressure detector in the hole and continue injecting water; read the pressure reading of the fluid pressure detector every 3 minutes; after three readings, if the change range of the pressure reading during this period does not exceed 10% of the first reading, it indicates that the grouting pressure has not increased significantly, and the first grouting material has been flowing into the cracks, that is, there are more cracks involved in this place, and more cracks can be affected during grouting, then this grouting hole is the core grouting hole.

[0037] In the step (3), the weight parts of the components are: 170 of cement, 30 of epoxy acrylate resin, 12 of p-xylene, 25 of ethanol, 10 of tannic acid, 8 of 2-hydroxyethyl methacrylate, 6 of mineral oil, 50 of manufactured sand, 9 of polyvinyl latex, 3 of bentonite, 5 of anhydrous aluminum sulfate, and 70 of limestone particles.

[0038] In the step (3), the particle size of the manufactured sand is 1.5 mm, the particle size of the bentonite is 5 mm, and the particle size of the limestone particles is 18 mm.

[0039] In the step (4), the intelligent grouting method is: grout multiple grouting holes simultaneously, and the automatic monitoring system monitors the grouting pressure in each grouting hole and feeds back the collected information to the control module of the intelligent grouting device; the control module adjusts the grouting pressure in each grouting hole at any time according to the monitored information to keep their respective grouting pressures until the grouting ends.

[0040] In the step (4), the intelligent grouting device is provided with a flow rate detection module at the orifice of each grouting hole. After continuously grouting in each grouting hole for 1 hour, turn on the flow rate detection module to monitor the flow rate of the first grouting material flowing through each grouting hole; if there is no change in the flow rate after monitoring for 10 minutes, it indicates that the grouting in each grouting hole is full, and then the grouting ends.

[0041] In the steps (4) and (5), the automatic monitoring system is arranged around the grouting holes and uses a fiber optic induction device for real-time monitoring.

[0042] In the step (6), the second grouting material comprises the following components in parts by weight: 150 parts of cement, 50 parts of epoxy acrylate resin, 10 parts of phenylmethane, 25 parts of ethanol, 12 parts of stearic acid, 50 parts of manufactured sand, 10 parts of bentonite, 3 parts of anhydrous aluminum sulfate, and 80 parts of limestone particles.

[0043] In the step (6), the manufactured sand has a particle size of 2 mm, the bentonite has a particle size of 8 mm, and the limestone particles have a particle size of 20 mm.

[0044] By reducing the dosage of epoxy acrylate resin, optimizing the sizes of manufactured sand, bentonite, and limestone particles, and simultaneously adjusting the dosages of stearic acid, phenylmethane, etc., a grouting material with high strength, low cost, and fast setting is obtained; the use amount of epoxy acrylate resin is not only reduced, but the performance indicators are significantly improved. Introducing ethanol into the grouting material not only reduces the moisture in the grouting material, but also can volatilize and carry away a small amount of moisture generated during the reaction of other components, accelerating the reaction rate and improving the strength of the grouting material. Bentonite can make the grouting material have good expansibility and adhesiveness, greatly enhancing the shear strength and tensile strength of the grouting material; aluminum sulfate can shorten the setting time of the grouting material and increase the strength of the grouting material.

[0045] Example 2

[0046] An intelligent grouting method for overburden separation layers includes the following steps:

[0047] (1) Survey the overburden separation layer situation on site to determine the range of the overburden separation layer area that needs to be strengthened by grouting;

[0048] (2) Set a plurality of grouting holes within the said area, and accurately detect the core grouting position of the overburden separation layer; inject water into each grouting hole in sequence, and set a fluid pressure detector in the hole. Determine the main core grouting holes based on the fluid pressure data detected by the fluid pressure detector as the said core grouting position;

[0049] (3) Prepare the first grouting material; the first grouting material comprises the following components: cement, epoxy acrylate resin, p - xylene, ethanol, tannic acid, 2 - hydroxyethyl methacrylate, mineral oil, manufactured sand, polyvinyl latex, bentonite, anhydrous aluminum sulfate, limestone particles;

[0050] (4) Use the first grouting material to perform intelligent grouting of the overburden separation layer through an intelligent grouting device, and set up an automatic monitoring system for real-time dynamic monitoring; among them, the intelligent grouting ensures that the grouting pressure in the core grouting hole is higher than that in the non-core grouting holes other than the core grouting hole, so as to ensure that the grouting material in the core grouting hole can more fully fill the cracks, further ensure the grouting effect, and strengthen the strength of the overburden separation layer; and adjust the grouting pressure in each grouting hole at any time;

[0051] (5) After the grouting is completed, remove the intelligent grouting device, seal the grouting holes, and retain the automatic monitoring system to conduct post-grouting strength monitoring on the overburden separation layer;

[0052] (6) Configure the second grouting material. If it is monitored that the overburden separation layer after grouting needs to be reinforced, set up reinforcement perfusion holes and perfusion the second grouting material to ensure that the strength of the overburden separation layer meets the design requirements.

[0053] In the step (1), it includes taking rock samples of the rock formation to determine the lithology, thickness and distribution of soft rock layers of the overburden separation layer; further detecting the crack distribution of the overburden separation layer; analyzing based on the sampling results and detection results to determine the range of the area to be grouted; using drill sampling, and jointly using an ultrasonic detection device and a stress induction device for detection.

[0054] In the step (2), when injecting water into each grouting hole in sequence, the other grouting holes are temporarily sealed. After injecting water into each grouting hole for 12 minutes, turn on the fluid pressure detector in the hole and continue to inject water; read the pressure reading of the fluid pressure detector every 3 minutes; after 5 readings, if the change range of the pressure reading during this period does not exceed 10% of the first reading, it indicates that the grouting pressure has not increased significantly, and the first grouting material has been flowing into the cracks, that is, there are more cracks involved in this place, and more cracks can be affected during grouting, then this grouting hole is the core grouting hole.

[0055] In the step (3), the weight parts of the components are: 150 of cement, 50 of epoxy acrylate resin, 10 of p-xylene, 35 of ethanol, 8 of tannic acid, 10 of 2-hydroxyethyl methacrylate, 5 of mineral oil, 60 of mechanism sand, 7 of polyvinyl latex, 5 of bentonite, 3 of anhydrous aluminum sulfate, 80 of limestone particles.

[0056] In the step (3), the particle size of the mechanism sand is 1 mm, the particle size of the bentonite is 8 mm, and the particle size of the limestone particles is 15 mm.

[0057] In the step (4), the intelligent grouting method is as follows: grout into multiple grouting holes simultaneously, and use an automatic monitoring system to monitor the grouting pressure in each grouting hole, and feed back the collected information to the control module of the intelligent grouting device; the control module adjusts the grouting pressure in each grouting hole at any time according to the monitored information to keep their respective grouting pressures until the grouting is completed.

[0058] In the step (4), the intelligent grouting device is provided with a flow detection module at the orifice of each grouting hole. After continuous grouting in each grouting hole for 1.5 h, start the flow detection module to monitor the flow rate of the first grouting material flowing through each grouting hole; if there is no change in the flow rate after monitoring for 10 min, it indicates that the grouting in each grouting hole is full, and the grouting ends.

[0059] In the steps (4) and (5), the automatic monitoring system is arranged around the grouting holes and uses a fiber optic induction device for real-time monitoring.

[0060] In the step (6), the second grouting material comprises the following components in parts by weight: 140 of cement, 70 of epoxy acrylate resin, 8 of phenylmethane, 35 of ethanol, 10 of stearic acid, 60 of manufactured sand, 8 of bentonite, 5 of anhydrous aluminum sulfate, and 70 of limestone particles.

[0061] In the step (6), the particle size of the manufactured sand is 3 mm, the particle size of the bentonite is 5 mm, and the particle size of the limestone particles is 25 mm.

[0062] In addition, in order to further improve the technical effect of the present invention, in this embodiment, the fiber optic induction device comprises a fiber optic fluid pressure sensor and a transmission line, and the control module of the intelligent grouting device comprises a core controller, a signal processor and a visual operation device; the fiber optic fluid pressure sensor accesses the detection signal into the core controller through the transmission line for demodulation and analysis, the core controller is connected to the signal processor, and can upload the analyzed and processed data to the visual operation device, and the visual operation device monitors the fiber optic fluid pressure data and sends relevant instructions to the intelligent grouting device according to abnormal conditions.

[0063] During the grouting process, the signal processor collects and saves the grouting pressure data of each grouting hole collected by the fiber optic fluid pressure sensor, matches it with the set grouting pressure and sets a warning value. When the monitored data is higher or lower than the warning value, an alarm is given immediately.

[0064] In the present invention, the intelligent grouting device can be connected to a large number of fiber optic sensing devices through transmission lines, with a clearer and simpler structure, good stability, strong compatibility and load-carrying capacity. The fiber optic sensing devices are arranged at the grouting outlets of each grouting hole, and can be reused, reducing the usage cost; the fiber optic sensing devices used have a long measuring distance, with effects such as strong signals, anti-interference, and simple circuits, and can dynamically monitor the change law of overburden separation in real time, accurately predict the location of potential hazard points, which is of great significance for preventing overburden separation disasters and ensuring personnel safety.

[0065] Embodiment 3

[0066] An intelligent grouting method for overburden separation includes the following steps:

[0067] (1) Survey the overburden separation situation on site to determine the range of the overburden separation area that needs to be strengthened by grouting;

[0068] (2) Set multiple grouting holes within the said area, and accurately detect the core grouting position of the overburden separation; Inject water into each grouting hole in sequence, and set a fluid pressure detector in the hole. Determine the main core grouting holes based on the fluid pressure data detected by the fluid pressure detector as the said core grouting position;

[0069] (3) Configure the first grouting material; The first grouting material includes the following components: cement, epoxy acrylate resin, p-xylene, ethanol, tannic acid, 2-hydroxyethyl methacrylate, mineral oil, machine-made sand, polyvinyl latex, bentonite, anhydrous aluminum sulfate, limestone particles;

[0070] (4) Use the first grouting material to carry out intelligent grouting of the overburden separation through the intelligent grouting device, and set up an automatic monitoring system for real-time dynamic monitoring; Among them, intelligent grouting ensures that the grouting pressure in the core grouting holes is higher than the pressure in the non-core grouting holes other than the core grouting holes, and adjusts the grouting pressure in each grouting hole at any time;

[0071] (5) After the grouting is completed, remove the intelligent grouting device, seal the grouting holes, and retain the automatic monitoring system to conduct post-grouting strength monitoring on the overburden separation;

[0072] (6) Configure the second grouting material. If it is monitored that the overburden separation after grouting needs to be strengthened, set up reinforcement perfusion holes and perfusion the second grouting material to ensure that the strength of the overburden separation meets the design requirements.

[0073] In step (1), it includes sampling the rock stratum to determine the lithology, thickness of the overlying strata separation and the distribution of weak rock strata; further detecting the crack distribution of the overlying strata separation; analyzing based on the sampling results and detection results to determine the range of the area to be grouted; taking borehole samples and using an ultrasonic detection device and a stress induction device in cooperation for detection.

[0074] In step (2), when injecting water into each grouting hole in sequence, other grouting holes are temporarily sealed. After injecting water into each grouting hole for 13 minutes, the fluid pressure detector in the hole is turned on and water injection continues; the pressure reading of the fluid pressure detector is read every 3 minutes; after 4 readings, if the change range of the pressure reading during this period does not exceed 10% of the first reading, it indicates that the grouting pressure has not increased significantly, and the first grouting material has been flowing into the cracks, that is, there are more cracks involved in this place and more cracks can be affected during grouting, then this grouting hole is the core grouting hole.

[0075] In step (3), the weight parts of the components are as follows: 160 parts of cement, 40 parts of epoxy acrylate resin, 11 parts of p-xylene, 30 parts of ethanol, 9 parts of tannic acid, 9 parts of 2-hydroxyethyl methacrylate, 5 parts of mineral oil, 55 parts of manufactured sand, 8 parts of polyvinyl latex, 4 parts of bentonite, 4 parts of anhydrous aluminum sulfate, and 75 parts of limestone particles.

[0076] In step (3), the particle size of the manufactured sand is 1.5 mm, the particle size of the bentonite is 7 mm, and the particle size of the limestone particles is 16 mm.

[0077] In step (4), the method of intelligent grouting is as follows: injecting grout into multiple grouting holes simultaneously, and the automatic monitoring system monitors the grouting pressure in each grouting hole and feeds back the collected information to the control module of the intelligent grouting device; the control module adjusts the grouting pressure in each grouting hole at any time according to the monitored information to keep their respective grouting pressures until the grouting ends.

[0078] In step (4), the intelligent grouting device is provided with a flow rate detection module at the orifice of each grouting hole. After continuously grouting in each grouting hole for 1 hour, the flow rate detection module is turned on to monitor the flow rate of the first grouting material flowing through each grouting hole; if there is no change in the flow rate after monitoring for 10 minutes, it indicates that the grouting in each grouting hole is full, and then the grouting ends.

[0079] In steps (4) and (5), the automatic monitoring system is arranged around the grouting holes and uses a fiber optic sensing device for real-time monitoring.

[0080] In the step (6), the second grouting material comprises the following components in parts by weight: 145 parts of cement, 60 parts of epoxy acrylate resin, 9 parts of phenylmethane, 30 parts of ethanol, 11 parts of stearic acid, 55 parts of manufactured sand, 9 parts of bentonite, 4 parts of anhydrous aluminum sulfate, and 75 parts of limestone particles.

[0081] In the step (6), the particle size of the manufactured sand is 3 mm, the particle size of the bentonite is 7 mm, and the particle size of the limestone particles is 24 mm.

[0082] In addition, in order to further improve the technical effect of the present invention, in this embodiment, an electric pressure regulating valve is arranged on the grouting pipe corresponding to each grouting hole of the intelligent grouting device. The intelligent grouting device automatically controls the opening degree of the electric pressure regulating valve according to the pressure value monitored by the automatic monitoring system in real time, so that the grouting material flows in the grouting pipe at a certain flow rate and enters the grouting hole to obtain the expected grouting pressure. In order to further ensure the grouting pressure and safety, a mechanical pressure regulating valve is also arranged on the grouting pipe. When the electric pressure regulating valve cannot meet the pressure regulation, the opening degree of the mechanical pressure regulating valve is further adjusted to assist in pressure control.

[0083] When grouting the grouting hole, on the premise that no further crack development occurs in the overburden separation layer, the upper limit of the grouting pressure is set. During the grouting process, if the upper limit of the grouting pressure is reached, the pressure is immediately adjusted and controlled to ensure grouting safety. Among them, the intelligent grouting ensures that the grouting pressure in the core grouting hole is higher than the pressure in the non-core grouting holes other than the core grouting hole. The purpose is to maintain a relatively high grouting pressure in the core grouting hole, so that the rock debris that has not fallen off in the overburden separation layer can fall off when impacted by the grouting, so as to further ensure that the grouting material fully and completely fills the cracks, and further ensure the overall strength of the overburden separation layer, which can greatly enhance the accuracy of grouting and the grouting quality.

[0084] During grouting, when it is monitored that the grouting pressure of a certain grouting hole suddenly increases, it is considered that the slurry in the grouting hole has been fully filled. Therefore, when the phenomenon of sudden pressure increase occurs, the grouting of this grouting hole should be immediately controlled to end to ensure the intelligent grouting quality and safe construction.

[0085] Performance Test of Grouting Materials

[0086] The first grouting material and the second grouting material in the above Examples 1-3 are respectively taken for pouring 5 test blocks for each grouting material. The specifications of the test blocks are (200.0×150.0×200.0) mm3. After demolding, they are cured in a constant temperature curing box. The curing temperature is 25 °C and the humidity is 83%. They are cured for 28 d respectively. After reaching the specified age, the test blocks are demolded, cored and polished. The experimental results are as shown in the following table.

[0087]

[0088] It can be seen therefrom that the grouting material used in the present invention has high strength, quick setting, and the reinforcement effect is significantly better than other similar products in the prior art.

[0089] It can be seen from the above embodiments that the method of the present invention is simple to operate, realizes intelligent grouting under complex geological conditions, has a high degree of automation, can greatly improve the grouting speed for overburden separation, has high construction efficiency, and the construction efficiency and quality can be guaranteed.

[0090] The method of the present invention accurately determines the range of the overburden separation area that needs to be strengthened by grouting, so as to be able to carry out effective grouting reinforcement, reasonably arrange the reinforcement form and grouting position, and improve the reinforcement effect and construction efficiency.

[0091] In the present invention, first determine the range of the overburden separation area that needs to be strengthened by grouting, then accurately detect the grouting core position of the overburden separation, judge the most reasonable grouting position, the construction quality control is more accurate, reduce the unnecessary grouting volume, greatly reduce the construction cost, and improve the construction efficiency.

[0092] The intelligent grouting method of the present invention achieves the intelligent grouting effect by real-time monitoring and control of each grouting hole, and greatly improves the construction safety; at the same time, through a variety of means for monitoring and control, the grouting accuracy is improved, and the same set of automatic monitoring system is used for real-time monitoring during and after grouting, greatly reducing the construction cost and complexity, and such a setting is not recorded in the prior art. In addition, using different grouting materials for grouting or reinforcement is more targeted and accurate, and can significantly improve the construction quality.

[0093] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. An intelligent grouting method for overburden separation, characterized in that, It includes the following steps: (1) Survey the separated strata situation of the overlying rock at the site, and determine the range of the separated strata area of the overlying rock that needs to be strengthened by grouting; (2) Set multiple grouting holes within the said area range, and accurately detect the core grouting position of the separated strata of the overlying rock; Inject water into each grouting hole in sequence, and set a fluid pressure detector in the hole. Determine the main core grouting holes based on the fluid pressure data detected by the fluid pressure detector as the said core grouting position; (3) Prepare the first grouting material; The first grouting material includes the following components: Cement, epoxy acrylate resin, p-xylene, ethanol, tannic acid, 2-hydroxyethyl methacrylate, mineral oil, manufactured sand, polyethylene latex, bentonite, anhydrous aluminum sulfate, limestone particles; (4) Use the first grouting material to conduct intelligent grouting of the separated strata of the overlying rock through an intelligent grouting device, and set up an automatic monitoring system for real-time dynamic monitoring; Among them, intelligent grouting ensures that the grouting pressure in the core grouting hole is higher than the pressure in the non-core grouting holes other than the core grouting hole, and adjusts the grouting pressure in each grouting hole at any time; (5) After the grouting is completed, remove the intelligent grouting device, seal the grouting holes, and retain the automatic monitoring system to conduct post-grouting strength monitoring on the separated strata of the overlying rock; [[ID=८]](6) Prepare the second grouting material. If it is monitored that the separated strata of the overlying rock after grouting needs to be reinforced, set up reinforcement perfusion holes and perfusion the second grouting material to ensure that the strength of the separated strata of the overlying rock meets the design requirements.

2. The intelligent grouting method for overlying strata separation according to claim 1, characterized in that, In the said step (1), it includes taking rock samples of the rock formation, determining the lithology, thickness and distribution of soft rock strata of the separated strata of the overlying rock; Further detecting the crack distribution of the separated strata of the overlying rock; Analyze based on the sampling results and detection results to determine the range of the area that needs grouting; Use drilling sampling, and cooperate with an ultrasonic detection device and a stress induction device for detection.

3. The intelligent grouting method for overburden separation layer according to claim 1 or 2, characterized in that, In the said step (2), when injecting water into each grouting hole in sequence, other grouting holes are temporarily sealed. After injecting water into each grouting hole for 12 - 15 minutes, turn on the fluid pressure detector in the hole and continue injecting water; Read the pressure reading of the fluid pressure detector every 3 minutes; After 3 - 5 readings, if the change range of the pressure reading during this period does not exceed 10% of the first reading, then this grouting hole is the core grouting hole.

4. The intelligent grouting method for overburden separation layer according to claim 3, characterized in that, In the said step (3), the weight parts of the components are: cement 150 - 170, epoxy acrylate resin 30 - 50, p-xylene 10 - 12, ethanol 25 - 35, tannic acid 8 - 10, 2-hydroxyethyl methacrylate 8 - 10, mineral oil 5 - 6, manufactured sand 50 - 60, polyethylene latex 7 - ९, bentonite 3 - 5, anhydrous aluminum sulfate 3 - 5, limestone particles 70 - 80.

5. The intelligent grouting method for overburden separation layer according to claim 4, characterized in that, In the said step (3), the particle size of the manufactured sand is 1 - 1.5 mm, the particle size of the bentonite is 5 - 8 mm, and the particle size of the limestone particles is 15 - 18 mm. It should be noted that there is an error in the original text where "८" in step (6) should probably be "8". The above translation is based on the corrected content.

6. The intelligent grouting method for overburden separation layer according to claim 5, characterized in that, In the step (4), the method of intelligent grouting is as follows: grout into multiple grouting holes simultaneously, and monitor the grouting pressure in each grouting hole by an automatic monitoring system, and feed back the collected information to the control module of the intelligent grouting device; the control module adjusts the grouting pressure in each grouting hole at any time according to the monitored information to keep their respective grouting pressures until the grouting ends.

7. The intelligent grouting method for overlying strata separation according to claim 6, characterized in that, In the step (4), the intelligent grouting device is provided with a flow detection module at the orifice of each grouting hole. After continuous grouting in each grouting hole for 1 - 1.5 h, start the flow detection module to monitor the flow rate of the first grouting material flowing through each grouting hole; if there is no change in the flow rate after monitoring for 10 min, it indicates that the grouting in each grouting hole is full, and then the grouting ends.

8. The intelligent grouting method for overburden separation layer according to claim 7, characterized in that, In the steps (4) and (5), the automatic monitoring system is arranged around the grouting holes and uses a fiber optic sensing device for real-time monitoring.

9. The intelligent grouting method for overburden separation layers according to claim 8, characterized in that, In the step (6), the second grouting material comprises the following components in parts by weight: 140 - 150 of cement, 50 - 70 of epoxy acrylate resin, 8 - 10 of phenylmethane, 25 - 35 of ethanol, 10 - 12 of stearic acid, 50 - 60 of manufactured sand, 8 - 10 of bentonite, 3 - 5 of anhydrous aluminum sulfate, and 70 - 80 of limestone particles.

10. The intelligent grouting method for overlying strata separation according to claim 9, characterized in that, In the step (6), the particle size of the manufactured sand is 2 - 3 mm, the particle size of the bentonite is 5 - 8 mm, and the particle size of the limestone particles is 20 - 25 mm.

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