A stress-monitored classified segment grouting device and a method of using the same

Abstract

The application discloses a stress-monitoring classified segmented grouting device and a use method thereof, and belongs to the field of grouting and ground stress measurement of tunnels and underground engineering of subways. The stress-monitoring classified segmented grouting device comprises a sleeve with three independent chambers, and a classified grouting controller is arranged in the sleeve and can inject different slurries into the three independent chambers in the sleeve by moving; the classified grouting controller is connected with a slurry preparation device through pipelines; the slurry preparation device comprises a plurality of independent grouting pools and a plurality of stirring pools; mixed slurries are formed by stirring in different stirring pools according to requirements; and the slurries stirred in the different stirring pools are extracted by high-low pressure grouting pumps and then connected with grouting pipe interfaces at the tail of the classified grouting controller through different pipelines. The stress-monitoring classified segmented grouting device has the advantages of simple structure, the ability to meet the requirements of super-deep ground stress measurement and segmented classified grouting, and multiple functions, accurate data and reasonable structure.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of stress classification segment grouting device and its using method of monitoring, belong to lane (tunnel) and subway underground engineering grouting and ground stress measurement field. BACKGROUND

[0002] Grouting reinforcement is a geotechnical engineering modification technology, its main principle is to inject certain solidifiable slurry into the fissures in the underground engineering such as roadway, tunnel, tunnel, etc., to improve the physical and mechanical properties by replacement, filling, extrusion and other methods, form grouting stone body with certain strength and anti-seepage effect, so as to enhance the stability and strength of soft and broken surrounding rock mass, achieve the purpose of reinforcement and anti-seepage. This reinforcement method is widely used in mine, subway, tunnel and water conservancy engineering fields, and its construction is convenient, time is short, effect is remarkable and other advantages are very important to improve the stability and safety of underground engineering.

[0003] At present, the reinforcement of soft surrounding rock mainly adopts sleeve valve pipe grouting and grouting pipe grouting method, although it can achieve certain reinforcement effect, but also has some defects. First of all, in actual engineering, the type of grouting material is often selected according to the size of crack, but the size of crack is different in different surrounding rock area, only using single grouting material will lead to unobvious grouting effect, leading to the expansion of grouting area, waste of grouting material and increase of construction cost, and even safety accidents, so classification grouting is needed; secondly, for the surrounding rock with near-end broken and far-end hard, only using permeation grouting, the far-end hard rock is difficult to penetrate, leading to slurry blockage; only using splitting grouting, the near-end rock mass may be intensified, increasing the safety hidden danger and construction cost, so the method of segment grouting is needed; thirdly, at present, the slurry is pre-mixed outdoors and then injected, but premature mixing will reduce the fluidity of slurry, affecting the reinforcement effect, so mixing and grouting are needed simultaneously; finally, the grouting and ground stress monitoring cannot be carried out simultaneously at present, and there are few instruments in this aspect, so further innovation is needed to solve this problem. SUMMARY

[0004] Technical problem: in view of the deficiencies of the prior art, a classification segment grouting device and its using method capable of monitoring ground stress can realize classification grouting, segment grouting and monitoring functions simultaneously to reinforce surrounding rock with different broken degrees. The device should have the ability to mix slurry on site in real time to ensure its good fluidity, and can simplify the process to realize monitoring and grouting simultaneously; this device integrates classification grouting, segment grouting, monitoring and instant mixing functions to solve the technical problems in underground engineering and realize the integrated operation process of "mixing-grouting-ground pressure monitoring".

[0005] Technical solution: To achieve the above technical purposes, the application discloses a kind of stress classification segmented grouting device that can be monitored, including sleeve that is divided into three independent chambers, classification grouting controller is arranged in sleeve, and different slurries can be injected into three independent chambers in sleeve respectively by moving;Three independent chambers in sleeve are respectively split grouting section, water pressure fracturing section and permeation grouting section from right to left, split grouting section end is closed, and multiple split grouting holes are arranged on the side wall with interval, split grouting hole is arranged on the side wall of water pressure fracturing section, and permeation grouting hole is arranged on the side wall of permeation grouting section;Permeation grouting is carried out on the near-end broken surrounding rock close to borehole orifice using permeation grouting section, ground stress monitoring is carried out using water pressure fracturing section, and split grouting is carried out on the far-end surrounding rock using split grouting section.

[0006] Wherein, classification grouting controller is telescopic rod structure inserted into sleeve, and sectional grouting controller is arranged at the end of classification grouting controller, so as to control sectional grouting controller to inject grout into three independent chambers respectively according to the depth of classification grouting controller pushed into sleeve, so as to realize sectional control of split grouting and water pressure fracturing grouting;Multiple grouting pipe interfaces and grouting pipe line selector are arranged at the tail of classification grouting controller.

[0007] Stopper matched with classification grouting controller is arranged at the front and rear ends of water pressure fracturing section in sleeve, so as to prevent grout injected into permeation grouting section, water pressure fracturing section and split grouting section from flowing.

[0008] Multiple grouting pipe interfaces at the tail of classification grouting controller are connected with grout preparation device through pipe line, grout preparation device includes multiple independent grouting pools and multiple stirring pools, water pump is arranged in each grouting pool, and control console is connected with water pump, so as to control grout filled in different grouting pools to be pumped out by water pump and input into stirring pool through grout conveying pipe to form mixed grout, stirring blade connected with stirring device is arranged in stirring pool, and grout outlet is arranged in stirring pool, wherein, different stirring pools are used for different mixed grout, and grout in different stirring pools after stirring is extracted by high-low pressure grouting pump and connected with grouting pipe interface at the tail of pipe line classification grouting controller through different pipe lines.

[0009] Grout filled in different grouting pools is pumped out by water pump and input into stirring pool through grout conveying pipe according to the need of control console, stirring blade connected with stirring device is arranged in stirring pool, and grout outlet is arranged in stirring pool, grout in stirring pool after stirring is extracted by high-low pressure grouting pump and connected with grouting pipe interface at the tail of pipe line classification grouting controller through pipe line.

[0010] Further, the classified grouting controller comprises two parts, the front part is a slurry delivery pipeline with hollow rod structure, the end of the slurry delivery pipeline is provided with a pipeline grouting outlet, the pipeline grouting outlet controls different slurry to flow out at the position of the permeation grouting section, the hydraulic fracturing section or the splitting grouting section; the rear part comprises a rotary selector arranged at the tail of the slurry delivery pipeline, the rotary selector comprises a circular selector shell, a plurality of grouting outlets are arranged on the circular surface of the selector shell, the grouting outlets are connected with the grouting pipe interfaces, a rotating shaft connecting port is arranged at the center of the circular surface of the selector shell, the grouting pipeline selector is connected with the closed circuit turntable on the inner side of the shell circular surface through the rotating shaft passing through the rotating shaft connecting port, the closed circuit turntable is rotated by rotating the grouting pipeline selector, only one slurry through hole is arranged on the closed circuit turntable, when the slurry through hole of the closed circuit turntable is rotated to any grouting outlet, the grouting outlet is connected with the pipeline through the grouting pipe interface, at this time, the remaining grouting outlets are closed.

[0011] Further, the sleeve is connected in series at the head and tail through threads for the splitting grouting section, the hydraulic fracturing section and the permeation grouting section.

[0012] Further, the hydraulic fracturing section is a double-plugging partition structure with a middle through hole, the hydraulic fracturing section comprises a middle section provided with a splitting water outlet, the upper packer and the lower packer are respectively arranged at the front and rear ends of the middle section, wherein the outer diameters of the upper packer and the lower packer match the drill hole, the outer diameter of the middle section is smaller than the drill hole, so that the slurry flowing out of the splitting water outlet is limited in the position of the drill hole and cannot channel.

[0013] Further, the splitting grouting section comprises a splitting grouting pipe, a plurality of splitting grouting holes are arranged on the splitting grouting pipe at intervals; the permeation grouting section is a permeation grouting pipe for realizing the permeation grouting function.

[0014] A use method of the classified segmented grouting device capable of monitoring ground stress, the steps are as follows:

[0015] Drill a hole at the selected position of the surrounding rock, assemble the permeation grouting pipe, the upper packer, the splitting water outlet, the lower packer and the splitting grouting pipe in sequence through threads to form a sleeve, and place the assembled sleeve into the drill hole.

[0016] Connect the grouting outlets of the slurry preparation device with the grouting outlets of the classified grouting controller through pipelines respectively;

[0017] The water, cement mortar, ultra-fine cement mortar, and water glass liquid slurry are respectively poured into different grouting pools, the ultra-fine cement mortar and the water glass liquid slurry are selected in the electric control table, the water pump is controlled to start the corresponding slurry water valve to pour into the stirring pool through the slurry conveying pipe, the electric control table is used to start the stirring motor to rotate the stirring blade, so that the slurry is prevented from being left in the grouting pool for too long to produce sediment, and meanwhile, the ultra-fine cement and the water glass liquid slurry are fully mixed to form the ultra-fine cement-water glass double liquid slurry with a mass ratio of 1:1, the high-low pressure grouting pump is adjusted after stirring, the slurry is extracted by low pressure and injected into the control conveying section, and the ultra-fine cement-water glass double liquid slurry is prepared to be supplied to carry out permeation grouting; the classified grouting controller is pushed, the pipeline slurry outlet is aligned to the position of the permeation grouting section, the slurry through hole is aligned to the grouting outlet through the rotating control grouting pipeline selector connected to the rotating shaft, the slurry outlet is opened, at this time, the slurry starts to flow to the slurry conveying pipeline through the slurry conveying pipe and the ultra-fine cement mortar is conveyed to the permeation grouting section from the pipeline slurry outlet, the ultra-fine cement mortar starts to permeate the surrounding fractured rock mass, and the permeation grouting body is formed, so that the rock mass is strengthened;

[0018] The grouting pool containing water is controlled to pour water into another stirring pool, the classified grouting controller is pushed, the pipeline slurry outlet is aligned to the position of the water pressure fracturing section, the slurry through hole is converted to be aligned to the grouting outlet of the stirring pool containing water through the rotating control grouting pipeline selector connected to the rotating shaft, the water pump is controlled to start to convey water to the water pressure fracturing section from the pipeline slurry outlet through the slurry conveying pipe, the water pressure starts to increase from 0, the electric control table monitors the water injection pressure in real time, at this time, the pipeline slurry outlet is aligned to the position to be fractured by water pressure, the upper packer and the lower packer prevent water from flowing in other directions of the borehole, at this time, the water injection water pressure is monitored by using the electric control table, and a pressure-time curve is drawn; when the water pressure exceeds the sum of the tensile strength of the rock and three times the original rock stress, the hole wall will crack, the water pressure in the electric control table will have a large fluctuation, at this time, the water pressure value P when the hole wall initially cracks is recorded; the water pressure is continuously increased, when the crack depth reaches three times the diameter of the borehole, the water pressure in the electric control table will have a second large fluctuation, at this time, the original rock stress state is reached, the water pressure is stopped to be increased, the pressure is kept constant, and the pressure value P1 is recorded, at this time, P1 is the horizontal stress, the vertical stress is calculated, the measurement work is completed, and the water pressure fracture is formed in the borehole;

[0019] In the electric console, select ordinary cement and water glass liquid slurry, according to the mass ratio of 1:1, control the water pump to open the corresponding water valve, through the slurry pipe, put the ordinary cement and water glass liquid slurry in the grouting pool into the third stirring pool, use the electric console to start the stirring motor to rotate the stirring blade, make the cement and water glass liquid slurry fully blend, form the cement-water glass double liquid slurry; push the classified grouting controller to align the pipeline slurry outlet to the splitting grouting section, adjust the rotating control grouting pipeline selector connected to the shaft to make the slurry through hole and the grouting port of the stirring pool matched with the cement-water glass double liquid slurry, adjust the high-low pressure grouting pump, through the high pressure from the pipeline slurry outlet to the splitting grouting section, the high pressure slurry will expand and fill the cracks after being injected into the stratum, produce the splitting effect, form the splitting grouting body, increase the stability and strength of the stratum, when carrying out the high pressure grouting operation, control the grouting pressure and grouting speed, the electric console displays the grouting pressure in real time, according to the grouting pressure, the grouting parameters can be adjusted to ensure that the expected splitting effect is achieved.

[0020] Further, the water pressure cracking vertical stress σ1 calculation formula is:

[0021] σ1=3σ2-P+T-P0

[0022] Wherein σ2 is the horizontal ground stress; P is the water pressure when the first crack; T is the tensile strength of rock; P0 is the fracture water pressure.

[0023] Further, the pressure calculation formula of the ultra-fine cement-water glass double liquid slurry permeation grouting is:

[0024]

[0025] Wherein p e is the allowable grouting pressure; p1 is the underground water pressure; λ is the resistance along the way; γ1 is the slurry specific weight; l is the grouting pipe length; v is the slurry flow rate; d is the grouting pipe diameter; C is the tolerance.

[0026] Further, the pressure calculation formula of the cement-water glass double liquid slurry splitting grouting is:

[0027]

[0028] Wherein p min is the minimum grouting pressure; h is the depth from the ground to the grouting section; γ is the natural specific gravity; σ t is the tensile strength of rock.

[0029] Beneficial effects: due to the adoption of the above technical scheme, the application has the functions of classified grouting, sectional grouting and simultaneous ground stress monitoring. The grout mixing device realizes the immediate mixing of grout. The closed-loop rotary table controls the grout to enter the grouting device according to the classification. The movable grout conveying pipeline realizes sectional grouting. The water pressure fracturing section realizes grouting and ground stress monitoring at the same time. The grouting device has multiple functions, solves the problem of integrated grouting and monitoring, and proposes a new method of classified sectional grouting. The application has simple structure, accurate data and stable function, can mix grout immediately to ensure good fluidity, and can simplify the process to realize simultaneous monitoring and grouting.

[0030] The application can realize the purpose of existing sectional grouting to ensure that the grouting process does not cause hole collapse, and realizes grouting from inside to outside instead of grouting different segments with different types of grout for different rock properties. Through the form of multiple grout pools, not only the grouting capacity of multiple types of grout can be realized, but also the ground stress monitoring capacity can be realized through the packer in the middle section. The ground stress measurement, high and low pressure grouting of different types of grout and immediate mixing of grout are reasonably combined together, and the structure is simple and has high feasibility. The functions of "mixing-grouting-ground pressure monitoring" are integrated BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure diagram of the classified sectional grouting device for monitoring ground stress in the embodiment of the application.

[0032] Figure 2 It is a structure diagram of the grout mixing device in the embodiment of the application.

[0033] Figure 3 It is a structure diagram of the high and low pressure grouting pump in the embodiment of the application.

[0034] Figure 4 It is a structure diagram of the classified grouting controller in the embodiment of the application.

[0035] Figure 5 It is a structure diagram of the sleeve in the embodiment of the application.

[0036] Figure 6 It is a diagram of permeation grouting in the embodiment of the application.

[0037] Figure 7 It is a diagram of water pressure fracturing for ground stress measurement in the embodiment of the application.

[0038] Figure 8 It is a diagram of splitting grouting in the embodiment of the application.

[0039] Figure: 1 - grouting pipeline selector, 2 - classification grouting controller, 3 - permeation grouting section, 4 - hydraulic fracturing section, 5 - sectional grouting controller, 6 - splitting grouting hole, 7 - splitting grouting section, 8 - grouting inlet, 9 - grouting stopper, 10 - splitting water outlet hole, 11 - electric control console, 12 - grouting pool, 13 - water pump, 14 - grouting pipe, 15 - stirring blade, 16 - stirring motor, 17 - grouting outlet, 18 - high-low pressure grouting pump, 19 - rotating shaft, 20 - closed loop rotating disc, 21 - slurry through hole, 22 - grouting port, 23 - rotating shaft connecting port, 24 - slurry conveying pipeline, 25 - pipeline grouting outlet, 26 - permeation grouting pipe, 27 - thread, 28 - upper packer, 29 - lower packer, 30 - splitting grouting pipe, 31 - permeation grouting body, 32 - hydraulic fracture, 33 - splitting grouting body. DETAILED DESCRIPTION

[0040] The application will be further described below in conjunction with the embodiments in the drawings:

[0041] As shown in Figure 1 and Figure 5 , the application discloses a classification sectional grouting device capable of monitoring ground stress, which comprises a sleeve divided into three independent chambers, and the sleeve is composed of a splitting grouting section 7, a hydraulic fracturing section 4 and a permeation grouting section 3 connected end to end through threads 27. The sleeve is provided with a classification grouting controller 2 capable of injecting different slurries into the three independent chambers in the sleeve through movement; wherein the three independent chambers in the sleeve are the splitting grouting section 7, the hydraulic fracturing section 4 and the permeation grouting section 3 from right to left, the end of the splitting grouting section 7 is closed, a plurality of splitting grouting holes 6 are arranged on the side wall at intervals, the side wall of the hydraulic fracturing section 4 is provided with a splitting water outlet hole 10, and the side wall of the permeation grouting section 3 is provided with a permeation grouting hole; the near-end broken surrounding rock near the borehole orifice is subjected to permeation grouting by the permeation grouting section 3, ground stress is monitored by the hydraulic fracturing section 4, and the far-end surrounding rock is subjected to splitting grouting by the splitting grouting section 7.

[0042] The hydraulic fracturing section 4 is a double-plugging partition structure with a middle through hole, and the hydraulic fracturing section 4 comprises a middle section provided with a splitting water outlet hole 10, and an upper packer 28 and a lower packer 29 are arranged on the front and rear ends of the middle section respectively, wherein the outer diameters of the upper packer 28 and the lower packer 29 match the borehole, and the outer diameter of the middle section is smaller than the borehole, so that the slurry discharged from the splitting water outlet hole 10 is limited in the position of the borehole by the upper packer 28 and the lower packer 29 and cannot channel flow. The splitting grouting section 7 comprises a splitting grouting pipe 30, and a plurality of splitting grouting holes 6 are arranged on the splitting grouting pipe 30 at intervals; the permeation grouting section 3 is a permeation grouting pipe 26 for realizing the function of permeation grouting.

[0043] As shown in Figure 4As shown, the classification grouting controller 2 is a telescopic rod structure inserted into the sleeve, the end of the classification grouting controller 2 is provided with a sectional grouting controller 5, according to the depth of the classification grouting controller 2 pushed into the sleeve, thereby controlling the sectional grouting controller 5 to inject grout into three independent chambers respectively, thereby realizing the sectional control of the splitting grouting and the water pressure fracturing grouting; the tail of the classification grouting controller 2 is provided with a plurality of grouting pipe interfaces 8 and a grouting pipe selector 1; the classification grouting controller 2 includes two parts, the front part is a hollow rod-shaped structure of the slurry delivery pipeline 24, the end of the slurry delivery pipeline 24 is provided with a pipeline grout outlet 25, the pipeline grout outlet 25 controls different slurry to flow out at the position of the permeation grouting section 3, the water pressure fracturing section 4 or the splitting grouting section 7; the rear part includes a rotary selector arranged at the tail of the slurry delivery pipeline 24, the rotary selector includes a circular selector housing, a plurality of grouting ports 22 are arranged on the circular surface of the selector housing, the grouting ports 22 are connected with the grouting pipe interfaces 8, a shaft connecting port 23 is arranged at the center of the circular surface of the selector housing, the grouting pipe selector 1 is connected with the closed circuit turntable 20 on the inner side of the housing circular surface through the shaft 19 passing through the shaft connecting port 23, the grouting pipe selector 1 is rotated to drive the closed circuit turntable 20 to rotate, only one slurry through hole 21 is arranged on the closed circuit turntable 20, when the slurry through hole 21 of the closed circuit turntable 20 is rotated to any grouting port 22, the grouting port 22 is connected with the pipeline through the grouting pipe interface 8, at this time, the remaining grouting ports 22 are closed.

[0044] A stop grouting device 9 matched with the classification grouting controller 2 is arranged at the front and rear ends of the water pressure fracturing section 4 in the sleeve respectively, thereby preventing the mutual flow of the slurry injected in the permeation grouting section 3, the water pressure fracturing section 4 and the splitting grouting section 7;

[0045] As shown in Figure 2 and Figure 3 As shown, the plurality of grouting pipe interfaces 8 at the tail of the classification grouting controller 2 are connected with a grout preparation device through a pipeline, the grout preparation device includes a plurality of independent grouting pools 12 and a plurality of stirring pools, each grouting pool 12 is provided with a water pump 13, the water pump 13 is connected with a control console 11, the control console 11 controls the slurry filled in different grouting pools 12 to be pumped out by the water pump 13 and input into a stirring pool to form a mixed slurry, a stirring blade 15 connected with a stirring device 16 is arranged in the stirring pool, the stirring pool is provided with a grout outlet 17, wherein different stirring pools are used for different mixed slurries, the slurry after stirring in different stirring pools is extracted by a high-low pressure grouting pump 18 and connected with the grouting pipe interfaces 8 at the tail of the pipeline classification grouting controller 2 through different pipelines respectively;

[0046] The filled slurry is pumped out by the water pump 13 according to the requirement of the control console 11 and is input into the mixing pool through the slurry conveying pipe 14. The mixing pool is provided with the stirring blade 15 connected by the stirring device 16. The mixing pool is provided with the slurry outlet 17. The slurry in the mixing pool is pumped out by the high-low pressure grouting pump 18 and is connected by the pipe line of the tail part of the classified grouting controller 2 through the grouting pipe interface 8.

[0047] As shown in the figure, a method for using the classified sectional grouting device for stress monitoring is as follows: Figure 6 - Figure 8

[0048] The penetration grouting pipe 26, the upper packer 28, the split water outlet 10, the lower packer 29 and the split grouting pipe 30 are assembled in sequence through the thread 27 to form a sleeve, and the assembled sleeve is placed into the borehole.

[0049] The slurry outlet 17 of the slurry preparation device is connected with the grouting outlet 22 of the classified grouting controller 2 through the pipe line.

[0050] The water, the cement mortar, the ultra-fine cement mortar and the water glass liquid slurry are respectively poured into different grouting pools 13. The ultra-fine cement mortar and the water glass liquid slurry are selected in the electric control console 11. The water pump 13 is started to open the corresponding slurry water valve to put the slurry into the mixing pool through the slurry conveying pipe 14. The electric control console 11 is used to start the stirring motor 16 to rotate the stirring blade 12 to prevent the slurry from being left in the grouting pool 13 for a long time to produce sedimentation. At the same time, the ultra-fine cement and the water glass liquid slurry are fully mixed to form the ultra-fine cement-water glass double liquid slurry with a mass ratio of 1:1. After stirring, the high-low pressure grouting pump 18 is adjusted. The low pressure is used to pump the slurry into the control conveying section to prepare to supply the ultra-fine cement-water glass double liquid slurry for penetration grouting. The classified grouting controller 2 is pushed. The pipe line slurry outlet 25 is aligned to the position of the penetration grouting section 3. The slurry through hole 21 is aligned with the grouting outlet 22 by rotating the shaft 19 of the control grouting pipe line selector 1. The slurry outlet 17 is opened. At this time, the slurry starts to flow to the slurry conveying pipe line 24 through the slurry conveying pipe 14 and is conveyed to the penetration grouting section from the pipe line slurry outlet 25. The ultra-fine cement mortar starts to penetrate into the surrounding broken rock mass to form the penetration grouting body 31 to achieve the effect of strengthening the rock mass.

[0051] ​The control water storage grouting pool 12 to another mixing pool to put water, push classification grouting controller 2, align the pipeline grouting mouth 25 to the water pressure fracturing section 4 position, through the rotation control grouting pipeline selector 1 connected to the shaft 19 grouting pipe liquid through hole 21 conversion to align with the grouting mouth 22 of the mixing pool of water storage, control water pump 13 start to send water through the grouting pipe 14 from the pipeline grouting mouth 25 to the water pressure fracturing section 4, to form water pressure fracture 32 in the borehole wall, the water pressure from 0 to start to rise, the real-time monitoring of water injection pressure of electric control platform 11, at this time the pipeline grouting mouth 25 aligns the position of the water pressure fracturing, the upper packer 28 and the lower packer 29 prevent water from flowing in other directions of the borehole, at this time the water injection pressure is monitored by using the electric control platform 11, and the pressure-time curve is drawn; when the water pressure exceeds the sum of the rock tensile strength and three times the original rock stress, the hole wall will crack, the water pressure in the electric control platform 11 will have a large fluctuation, at this time the water pressure value P of the initial cracking of the hole wall is recorded; continue to increase the water pressure, when the crack depth reaches three times the diameter of the borehole, the water pressure in the electric control platform 11 will have a second large fluctuation, at this time the original rock stress state is reached, the water pressure is stopped to increase, and the pressure value P1 is kept constant, at this time P1 is the horizontal stress, the vertical stress is calculated, and the measurement work is completed;

[0052] In the electric control platform 11, ordinary cement and water glass liquid slurry are selected, and the mass ratio is 1:1. The water valve of the water pump 13 is controlled to open, and the ordinary cement and water glass liquid slurry in the grouting pool 12 are put into the third mixing pool through the grouting pipe 14. The stirring motor 16 is started to rotate the stirring blade 12 by using the electric control platform 11, so that the cement and the water glass liquid slurry are fully mixed to form cement-water glass double liquid slurry. The pipeline grouting mouth 25 is aligned to the splitting grouting section 7 by pushing the classification grouting controller 2. The shaft 19 connected to the control grouting pipeline selector 1 is adjusted to align the grouting pipe liquid through hole 21 with the grouting mouth 22 of the mixing pool in which the cement-water glass double liquid slurry is mixed. The high-low pressure grouting pump 18 is adjusted, the cement-water glass double liquid slurry is transported from the pipeline grouting mouth 25 to the splitting grouting section 7 through high pressure, the high-pressure slurry expands and fills the cracks after being injected into the stratum, a splitting effect is generated, a splitting grouting body 33 is formed, and the stability and strength of the stratum are increased. When the high-pressure grouting operation is performed, the grouting pressure and the grouting speed are controlled, the grouting pressure is displayed in real time by the electric control platform 11, and the grouting parameters can be adjusted according to the grouting pressure to ensure that the expected splitting effect is achieved.

[0053] The water pressure fracturing vertical stress σ1 calculation formula is:

[0054] σ1=3σ2-P+T-P0

[0055] Wherein σ2 is the horizontal stress; P is the water pressure at the initial cracking; T is the rock tensile strength; P0 is the crack water pressure.

[0056] The pressure calculation formula for the ultrafine cement-water glass double slurry infiltration grouting is:

[0057]

[0058] where p e is the allowable grouting pressure; p1 is the groundwater pressure; λ is the longitudinal resistance; γ1 is the slurry density; l is the grouting pipe length; v is the slurry flow rate; d is the grouting pipe diameter; and C is the tolerance.

[0059] The pressure calculation formula for the cement-water glass dual slurry splitting grouting is:

[0060]

[0061] where p min is the minimum grouting pressure; h is the depth from the ground to the grouting section; γ is the natural gravity; σ t is the tensile strength of rock.

[0062] Example: The present invention's segmented grouting device for monitoring geostress comprises a grouting section, a controlled delivery section, a permeation grouting section, a hydraulic fracturing section, and a splitting grouting section. The grouting section is used for immediate grouting, the delivery section is used to control slurry flow, the permeation grouting section is used for permeation grouting of the proximal fractured surrounding rock, the hydraulic fracturing section is used for geostress monitoring, and the splitting grouting section is used for splitting grouting of the distal surrounding rock.

[0063] like Figure 2 、 3 The figure shows a side view of the slurry preparation device, which includes an electrical control panel 11, a grouting tank 12, a water pump 13, a slurry delivery pipe 14, a stirring blade 15, a stirring motor 16, a slurry outlet 17, and high- and low-pressure grouting pumps 18. The desired slurry type is selected on the electrical control panel 11. The water pump 13 draws the slurry from the corresponding grouting tank 12, places it into the stirring tank through the slurry delivery pipe 14, and after stirring, the high- and low-pressure grouting pumps 18 pump it into the controlled delivery section.

[0064] like Figure 4 As shown, the control and delivery section consists of a rotating shaft 19, a closed-circuit turntable 20, a slurry through-hole 21, a grouting port 22, a rotating shaft connection 23, a slurry delivery pipeline 24, and a pipeline slurry outlet 25. The rotating shaft 19 rotates the closed-circuit turntable 20 to align the slurry through-hole 21 with one of the four grouting ports, allowing slurry from one of the grouting ports to pass through. The four grouting ports correspond one-to-one with the four delivery pipes in the slurrying section, allowing for free selection of slurry type. The closed-circuit turntable 20 is located within the control and delivery section, while the rotating shaft 19 is located outside the device via the rotating shaft connection 23, facilitating rotational control. The pipeline slurry outlet 25 controls the outflow of slurry during the infiltration grouting, hydraulic fracturing, or splitting grouting sections.

[0065] like Figure 5As shown, the permeation grouting section consists of a permeation grouting pipe 26, which performs permeation grouting. The hydraulic fracturing section consists of an upper packer 28, a splitting outlet 10, and a lower packer 29, which measures ground stress. The splitting grouting section consists of a splitting grouting hole 6 and a splitting grouting pipe 30, which performs splitting grouting. The permeation grouting section, hydraulic fracturing section, and splitting grouting section are connected by threads 27.

[0066] like Figure 6 The figure shows the slurry flow direction and the effect of the infiltration grouting during the infiltration grouting stage;

[0067] like Figure 7 The figure shows the slurry flow direction and splitting effect during the ground stress measurement stage;

[0068] like Figure 8 As shown in FIG, this is a schematic diagram of the slurry flow direction and splitting grouting effect during the splitting grouting stage.

Claims

1. A classification and segmentation grouting device capable of monitoring ground stress, characterized by: The invention comprises a sleeve divided into three independent chambers, wherein a classification grouting controller (2) is provided in the sleeve and can inject different slurries into the three independent chambers in the sleeve by moving; wherein the three independent chambers in the sleeve are respectively a splitting grouting section (7), a hydraulic fracturing section (4) and a permeation grouting section (3) from right to left; the splitting grouting section (7) is closed at the end, and a plurality of splitting grouting holes (6) are provided at intervals on the side wall; the hydraulic fracturing section (4) is provided with a splitting water outlet hole (10) on the side wall; and the permeation grouting section (3) is provided with a permeation grouting hole on the side wall; the permeation grouting section (3) is used to perform permeation grouting on the proximal broken surrounding rock near the borehole mouth, the hydraulic fracturing section (4) is used to monitor the ground stress, and the splitting grouting section (7) is used to perform splitting grouting on the distal surrounding rock; The classification grouting controller (2) is a telescopic rod structure inserted into the sleeve, and a segmented grouting controller (5) is provided at the end of the classification grouting controller (2). According to the depth of the classification grouting controller (2) pushed into the sleeve, the segmented grouting controller (5) is controlled to grout into three independent chambers respectively, thereby realizing segmented control of splitting grouting and hydraulic fracturing grouting; a plurality of grouting pipe interfaces (8) and a grouting pipeline selector (1) are provided at the tail of the classification grouting controller (2); The inner side of the middle sleeve is provided with grout stoppers (9) matched with the classification grouting controller (2) at the front and rear ends of the hydraulic fracturing section (4), thereby preventing the slurries injected into the penetration grouting section (3), the hydraulic fracturing section (4) and the splitting grouting section (7) from flowing into each other; The multiple grouting pipe interfaces (8) at the tail of the classification grouting controller (2) are connected to a slurry making device through pipelines. The slurry making device includes multiple independent grouting pools (12) and multiple stirring pools. Each grouting pool (12) is provided with a water pump (13). The water pump (13) is connected to an electric control panel (11). The electric control panel (11) controls the slurry filled in different grouting pools (12) to be pumped out by the water pump (13) and input into a stirring pool through a slurry delivery pipe (14) for stirring to form a mixed slurry. The stirring pool is provided with a stirring blade (15) connected through a stirring device (16). The stirring pool is provided with a slurry outlet (17). Each mixed slurry uses a different stirring pool. The slurry after stirring in different stirring pools is pumped out by high and low pressure grouting pumps (18) and connected to the grouting pipe interfaces (8) at the tail of the pipeline classification grouting controller (2) through different pipelines. The slurry filled in the grouting pool (12) is pumped out by the water pump (13) according to the needs of the electric control panel (11) and input into the mixing pool through the slurry delivery pipe (14). The mixing pool is provided with a stirring blade (15) connected through a stirring device (16). The mixing pool is provided with a slurry outlet (17). The slurry after stirring in the mixing pool is pumped out by the high and low pressure grouting pumps (18) and then connected to the grouting pipe interface (8) at the tail of the pipeline classification grouting controller (2); The classification grouting controller (2) includes two parts, the front part is a slurry conveying pipeline (24) with a hollow rod structure, the end of the slurry conveying pipeline (24) is provided with a pipeline slurry outlet (25), and the pipeline slurry outlet (25) controls different slurries to flow out at the infiltration grouting section (3), the hydraulic fracturing section (4) or the splitting grouting section (7); the rear part includes a rotary selector arranged at the tail of the slurry conveying pipeline (24), the rotary selector includes a circular selector shell, and a plurality of grouting ports (22) are provided on the circular surface of the selector shell, and the grouting ports (22) are connected to the grouting pipe interface (8). A rotating shaft connection port (23) is provided at the center of the circular surface of the selector housing. The grouting pipeline selector (1) is connected to the closed-circuit turntable (20) on the inner side of the circular surface of the housing via a rotating shaft (19) passing through the rotating shaft connection port (23). The closed-circuit turntable (20) is driven to rotate by rotating the grouting pipeline selector (1). The closed-circuit turntable (20) is provided with only one slurry through hole (21). When the slurry through hole (21) of the closed-circuit turntable (20) rotates to any grouting port (22), the grouting port (22) is connected to the pipeline connected to the grouting pipe interface (8). At this time, the remaining grouting ports (22) are all closed. The sleeve is a splitting grouting section (7), a hydraulic fracturing section (4) and a permeation grouting section (3) connected end to end by a thread (27); The hydraulic fracturing section (4) is a double-blocking partition structure with a middle through hole. The hydraulic fracturing section (4) includes a middle section provided with a splitting water outlet (10). An upper packer (28) and a lower packer (29) are provided on the front and rear ends of the middle section, respectively. The outer diameters of the upper packer (28) and the lower packer (29) match the borehole, and the outer diameter of the middle section is smaller than the borehole, so that the slurry discharged from the splitting water outlet (10) is restricted by the upper packer (28) and the lower packer (29) to the position of the borehole and does not flow through.

2. A classification and segmented grouting device capable of monitoring ground stress according to claim 1, characterized in that: The splitting grouting section (7) comprises a splitting grouting pipe (30), on which a plurality of splitting grouting holes (6) are arranged at intervals; the infiltration grouting section (3) is a infiltration grouting pipe (26) for realizing the infiltration grouting function.

3. A method for using the classification and segmentation grouting device capable of monitoring ground stress according to claim 1, characterized in that Here are the steps: Drill a hole at a selected location in the surrounding rock, assemble the permeation grouting pipe (26), the upper packer (28), the splitting outlet (10), the lower packer (29), and the splitting grouting pipe (30) in sequence through the thread (27) to form a sleeve, and place the assembled sleeve into the drill hole; The slurry outlets (17) of the slurry making device are respectively connected to the grouting ports (22) of the classification grouting controller (2) through pipelines; Pour water, cement mortar, ultrafine cement mortar and water glass slurry into different grouting pools (13) respectively, select ultrafine cement mortar and water glass slurry in the electric control panel (11), control the water pump (13) to start the corresponding slurry water valve and put it into the mixing pool through the slurry pipe (14), use the electric control panel (11) to start the stirring motor (16) to rotate the stirring blade (12) to prevent the slurry from being retained in the grouting pool (13) for too long and causing precipitation, and at the same time make the ultrafine cement and water glass slurry fully blend to form ultrafine cement-water glass double slurry with a mass ratio of 1:

1. After stirring, adjust the high and low pressure grouting pumps (18) and pump the slurry into the control panel at low pressure. The conveying section is prepared to supply ultrafine cement-water glass double liquid slurry for infiltration grouting; the classification grouting controller (2) is pushed to align the pipeline slurry outlet (25) with the infiltration grouting section (3) position, and the slurry through hole (21) is aligned with the grouting port (22) by controlling the grouting pipeline selector (1) to rotate the shaft (19), and the slurry outlet (17) is opened. At this time, the slurry begins to flow through the slurry delivery pipe (14) to the slurry delivery pipeline (24) and conveys ultrafine cement mortar from the pipeline slurry outlet (25) to the infiltration grouting section. The ultrafine cement mortar begins to penetrate into the surrounding broken rock mass, forming an infiltration grouting body (31), thereby achieving the effect of strengthening the rock mass; The grouting pool (12) containing water is controlled to release water into another mixing pool, the classified grouting controller (2) is pushed, the pipeline slurry outlet (25) is aligned with the hydraulic fracturing section (4), the slurry through hole (21) is converted to align with the grouting port (22) of the mixing pool containing water by rotating the shaft (19) connected to the grouting pipeline selector (1), and the water pump (13) is controlled to start and transport water from the pipeline slurry outlet (25) to the hydraulic fracturing section (4) through the slurry pipe (14) to form hydraulic fractures in the borehole wall. (32), the water pressure starts to increase from 0, and the control panel (11) monitors the injection pressure in real time. At this time, the slurry outlet (25) of the pipeline is aligned with the position where the water pressure is to be fractured, and the upper packer (28) and the lower packer (29) prevent the water from flowing in other directions in the borehole. At this time, the control panel (11) is used to monitor the injection water pressure and draw a pressure-time curve; when the water pressure exceeds the sum of the rock tensile strength and three times the original rock stress, the hole wall will crack, and the water pressure in the control panel (11) will fluctuate greatly. At this time, the water pressure value at the initial cracking of the hole wall is recorded. P ; Continue to increase the water pressure. When the crack depth reaches three times the borehole diameter, the water pressure in the control console (11) will experience a second large fluctuation. At this time, the original rock stress state is reached. Stop increasing the water pressure and keep the pressure constant. The pressure value is recorded as P 1 ,at this time P 1 The horizontal stress is then calculated and the vertical stress is completed. Select ordinary cement and water glass slurry in the electric control panel (11) in a mass ratio of 1:1, control the water pump (13) to open the corresponding water valve, and put the ordinary cement and water glass slurry in the grouting pool (12) into the third mixing pool through the slurry pipe (14). Use the electric control panel (11) to start the stirring motor (16) to rotate the stirring blade (12) to fully blend the cement and water glass slurry to form a cement-water glass double slurry; push the classification grouting controller (2) to align the pipeline slurry outlet (25) with the split grouting section (7), adjust the shaft (19) connected to the grouting pipeline selector (1) to make the slurry through hole (2 1) Align and connect the grouting port (22) of the mixing tank with the cement-water glass dual-liquid slurry, adjust the high and low pressure grouting pumps (18), and transport the cement-water glass dual-liquid slurry from the pipeline outlet (25) to the splitting grouting section (7) through high pressure. After the high-pressure slurry is injected into the formation, it will expand and fill the cracks, produce a splitting effect, form a splitting grouting body (33), and increase the stability and strength of the formation. When performing the high-pressure grouting operation, control the grouting pressure and grouting speed. The electric control console (11) displays the grouting pressure in real time. According to the grouting pressure, the grouting parameters can be adjusted to ensure that the expected splitting effect is achieved.

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