A device and method for detecting the grouting strength and compactness of fractured rock masses

Abstract

The invention relates to the technical field of grouting, and aims to provide a method and device for detecting the grouting strength and compactness of a fractured rock mass. The method and device comprise the following steps: step 1: obtaining the fracture state characteristics of a rock mass to be grouted, replacing the drill bit of a drilling device according to the fracture state characteristics, and executing step 2; step 2: preparing grouting liquid according to the characteristics of the rock mass to be grouted, introducing the grouting liquid into the drilling device, starting the drilling device, and grouting the drill bit along the fracture direction, and executing step 3; step 3: during the grouting process, obtaining the solidification characteristics of the grouting liquid in the fracture, calculating the solidification degree through a processor, and comparing the solidification degree with the standard solidification parameter threshold interval pre-stored in the processor, and executing step 4; step 4: until the strength and compactness of the grouting liquid in the fracture reach the pre-stored standard solidification parameter threshold interval, the grouting and detection work is completed, and a rapid evaluation of the grouting strength and compactness of the fractured rock mass can be realized, which is beneficial to the progress of engineering construction.

Description

Technical Field

[0001] The invention relates to the technical field of mine grouting, and in particular to a device and method for detecting the grouting strength and compactness of a fractured rock mass. Background Art

[0002] When carrying out water stopping and reinforcement of fractured rock mass engineering, in order to ensure the smooth progress of the project and meet the quality requirements, grouting reinforcement will be carried out inside and outside the fractured rock mass. However, there is no convenient and effective method for real-time strength detection of fractured rock mass after grouting. The conventional methods are mainly drilling coring and ground penetrating radar scanning. Drilling coring is difficult to carry out during tunnel construction and the cost is huge. The ground penetrating radar method has the advantage of scanning, but it can only qualitatively evaluate whether there are cracks and cavities after grouting, and cannot evaluate the strength of grouting. It will bring certain inconvenience to subsequent projects. If a method and device that is convenient for strength detection can be designed, such problems can be solved.

[0003] At present, there is no complete set of grouting strength and density testing equipment for grouting engineering of fractured rock and soil. In grouting engineering, grouting quality testing usually adopts two methods: on-site testing and indoor testing. On-site testing usually adopts four methods: surface subsidence observation, excavation, drilling and geophysical exploration. Indoor experiments mainly conduct indoor experiments and observations on sampling results. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a novel grouting control method and device, which performs grouting on fractured rock mass through a drill bit and detects the strength and density of the grouting liquid in real time until the grouting liquid reaches a preset standard value.

[0005] The invention is realized by the following technical scheme: on the one hand, a method for detecting the strength and compactness of grouting of fractured rock mass comprises the following steps:

[0006] Step 1: Obtain the fracture state characteristics of the rock mass to be grouted, replace the drill bit of the drilling equipment according to the fracture state characteristics, and execute step 2;

[0007] Step 2: According to the characteristics of the rock mass to be grouted, the grouting liquid is prepared, introduced into the drilling equipment, the drilling equipment is started, and the drill bit is used to perform grouting along the fracture direction, and step 3 is executed;

[0008] Step 3: During the grouting process, the solidification characteristics of the grouting liquid in the cracks are obtained, the solidification degree is calculated by the processor, and compared with the standard solidification parameter threshold range pre-stored in the processor, and step 4 is executed;

[0009] Step 4: The grouting and testing work is completed until the strength and density of the grouting liquid in the cracks reach the pre-stored standard solidification parameter threshold range.

[0010] Preferably, in the step 1, the state characteristics of the fissures include the length and depth of the fissures and the type of rock mass.

[0011] Preferably, in the step 1, the impact surface structures of each drill bit are different, and each drill bit is provided with through holes of different diameters. A cavity is arranged at one end of the drilling equipment close to the drill bit, and the cavity is communicated with the through holes. The grouting length of the drill bit is judged by the amount of filler in the cavity.

[0012] Preferably, in the step 3, the calculation process of the standard solidification parameter threshold range is as follows: through experiments, different grouting liquids with different mixing ratios are measured, and after obtaining different strengths, compressive tests are carried out. When the compressive tests all meet the compressive tests in the industry, the standard solidification parameter threshold range under this mixing ratio is obtained.

[0013] On the other hand, a device for detecting the grouting strength and compactness of fractured rock masses includes a semi-closed drilling equipment. The drilling equipment is used for grouting the fissures to be grouted. The drilling equipment is also provided with a bottom plate with leakage holes and a connecting column arranged at the center of the bottom plate. A core memory is arranged at one end of the connecting column located inside the drilling equipment, and a drill bit is arranged at one end of the connecting column located outside the drilling equipment. A pressure sensor is arranged inside the drill bit.

[0014] A slurry discharge device, a circulating liquid filter and a stirring and conveying pipe are arranged inside the drilling equipment. The slurry discharge device is arranged at one end of the drilling equipment far from the drill bit. The slurry discharge device filters and discharges the slurry in the drilling equipment through the circulating liquid filter, and conveys the slurry to the drill bit through the stirring and conveying pipe.

[0015] A display device is arranged on the drilling equipment. The display device includes a display screen, a processor and a signal conversion module. The pressure sensor is used to collect the solidification parameters of the grouting liquid after grouting. The pressure sensor is connected to the processor through the signal conversion module, and the standard solidification range value is pre-stored in the processor.

[0016] Preferably, a cavity is arranged inside the connecting column. The cavity is communicated with the through holes and the core memory. A volume sensor is arranged inside the core memory, and the volume sensor is connected to the signal conversion module.

[0017] Preferably, the cavity is a cylindrical cavity, and the central axis of the cylindrical cavity coincides with the central axis of the drilling equipment.

[0018] Preferably, a plurality of screws are arranged on the bottom plate, and the bottom plate is fixed to the connecting pile through the screws.

[0019] The beneficial effects of the present invention are:

[0020] (1) It can realize the rapid evaluation of the grouting strength and density of fractured rock mass, which is beneficial to the progress of engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a working principle diagram of the present invention;

[0022] Figure 2 The invention discloses a structural simplified method for detecting the grouting strength and compactness of a fractured rock mass.

[0023] Explanation of the accompanying drawings: 1. Drilling equipment; 2. Drill bit; 3. Pressure sensor; 4. Connecting pile; 5. Core storage device; 6. Slurry discharger; 7. Circulating liquid filter; 8. Stirring and conveying pipe; 9. Display device; 10. Cavity; 11. Bottom plate. DETAILED DESCRIPTION

[0024] Below in conjunction with the appended Figures 1 to 2 , clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by ordinary technicians in this field without creative work.

[0025] In the description of the present invention, it should be understood that the terms "counterclockwise", "clockwise", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] Embodiment 1:

[0027] The following steps are involved:

[0028] Step 1: Obtain the fracture state characteristics of the rock mass to be grouted, replace the drill bit of the drilling equipment according to the fracture state characteristics, and execute step 2;

[0029] Step 2: According to the characteristics of the rock mass to be grouted, the grouting liquid is prepared, introduced into the drilling equipment, the drilling equipment is started, and the drill bit is used to perform grouting along the fracture direction, and step 3 is executed;

[0030] Step 3: During the grouting process, obtain the solidification characteristics of the grouting liquid in the crack, calculate the degree of solidification through the processor, and compare it with the standard solidification parameter threshold range stored in the processor, then execute Step 4;

[0031] Step 4: Until the strength and density of the grouting liquid in the crack both reach the standard solidification parameter threshold range stored in advance, complete the grouting and detection work.

[0032] It should be noted that there is a semi-closed drilling device 1. The drilling device 1 is used to perform grouting work on the crack to be grouted. The drilling device is also provided with a bottom plate 11 with leakage holes and a connecting column arranged at the center of the bottom plate 11. One end of the connecting column located inside the drilling device is provided with a core memory 5, and one end of the connecting column located outside the drilling device is provided with a drill bit 2. A pressure sensor 3 is arranged inside the drill bit 2.

[0033] A slurry discharge device 6, a circulating liquid filter 7 and a stirring and conveying pipe 8 are arranged inside the drilling device 1. The slurry discharge device 6 is arranged at one end of the drilling device far from the drill bit 2. The slurry discharge device 6 filters and discharges the slurry inside the drilling device 1 through the circulating liquid filter, and conveys the slurry to the drill bit 2 through the stirring and conveying pipe 8.

[0034] A display device 9 is arranged on the drilling device 1. The display device 9 includes a display screen, a processor and a signal conversion module. The pressure sensor 3 is used to collect the solidification parameters of the grouting liquid after grouting. The pressure sensor 3 is connected to the processor through the signal conversion module. The standard solidification range value is stored in the processor in advance.

[0035] The drilling device 1 is also provided with a motor and a power connector. The output end of the motor is connected to the drill bit 2.

[0036] A cavity 10 is arranged inside the connecting column. The cavity 10 is communicated with the core memory 5. A volume sensor is arranged inside the core memory 5. The volume sensor is connected to the signal conversion module.

[0037] A number of screws are arranged on the bottom plate 11. The bottom plate is fixed to the connecting pile through the screws.

[0038] It should be noted that the display screen, signal conversion module, processor, pressure sensor, etc. adopted in the present invention are all commonly used devices in the prior art and will not be elaborated here.

[0039] It should be noted that in Step 1, the state characteristics of the crack include the length, depth of the crack and the type of rock mass.

[0040] It should be noted that in step 1, the impact surface structures of each drill bit are different, and each drill bit is provided with through holes of different diameters. A cavity is provided at one end of the drilling equipment close to the drill bit, and the cavity is communicated with the through holes. The grouting length of the drill bit is judged by the amount of filler in the cavity.

[0041] It should be noted that in step 3, the calculation process of the standard solidification parameter threshold range is as follows: through experiments, different grouting liquids with different mixing ratios are measured, and after obtaining different strengths, compressive tests are carried out. When the compressive tests all meet the industry's compressive tests, the standard solidification parameter threshold range under this mixing ratio is obtained.

[0042] It should be noted that compared with the prior art such as radar and acoustic wave methods for detecting the diffusion range, strength and density of the grout, the present invention has lower costs, and can detect the solidification parameters of the grout in real time during the real-time grouting process. In addition, through the through holes, some particulate matter will enter the cavity 10. Through the sensor capable of detecting the volume provided in the cavity 10, the density of the grout is obtained according to the distance that the particulate grout material enters the cavity 10.

[0043] In summary, drill holes at the place where the grout is poured. During the drilling process, replenish the grout in the stirring and conveying pipe 8 through the grout outer discharger 6, and transport the grout to the drill bit 2 for grouting the fractured rock mass. The density of the grout is obtained through the pressure sensor and the display device, and thus the strength and density of the grout can be obtained simultaneously, and the state during the grouting process can be determined comprehensively.

Claims

1. A method for detecting the grouting strength and compactness of fractured rock masses, characterized in that, The following steps are involved: Step 1: Obtain the fracture state characteristics of the rock mass to be grouted, replace the drill bit of the drilling equipment according to the fracture state characteristics, and execute step 2; Step 2: According to the characteristics of the rock mass to be grouted, the grouting liquid is prepared, introduced into the drilling equipment, the drilling equipment is started, and the drill bit is used to perform grouting along the fracture direction, and step 3 is executed; Step 3: During the grouting process, the solidification characteristics of the grouting liquid in the cracks are obtained, the solidification degree is calculated by the processor, and compared with the standard solidification parameter threshold range pre-stored in the processor, and step 4 is executed; Step 4: until the strength and density of the grouting liquid in the cracks reach the pre-stored standard solidification parameter threshold range, the grouting and testing work is completed; In step 1, the impact surface structure of each drill bit is different, and each drill bit has a corresponding through hole of different diameters. A cavity is provided at one end of the drilling equipment close to the drill bit, and the cavity is connected to the through hole. The grouting length of the drill bit is determined by the amount of filler in the cavity.

2. The grouting strength and compactness detection method for fractured rock masses according to claim 1, characterized in that In step 1, the state characteristics of the fracture include the length, depth and type of rock mass of the fracture.

3. The method for detecting the grouting strength and compactness of fractured rock masses according to claim 1, characterized in that, In step 3, the calculation process of the standard solidification parameter threshold range is to measure and calculate through experiments, and perform compression tests on different grouting liquids at different mixing ratios to obtain different strengths. When the compression tests meet the compression tests within the industry, the standard solidification parameter threshold range under the mixing ratio is obtained.

4. A device for detecting the grouting strength and compactness of fractured rock masses, characterized in that, A method for detecting the grouting strength and compactness of a fractured rock mass applied to any one of claims 1 to 3, comprising a semi-enclosed drilling device (1), wherein grouting is performed on the fracture to be grouted through the drilling device (1), wherein the drilling device is further provided with a bottom plate (11) with a leak hole and a connecting column arranged at the center of the bottom plate (11), wherein a core storage device (5) is arranged at one end of the connecting column located inside the drilling device, and a drill bit (2) is arranged at one end of the connecting column located outside the drilling device, wherein a pressure sensor (3) is arranged inside the drill bit (2), The drilling equipment (1) is provided with a slurry discharger (6), a circulating fluid filter (7) and a stirring and conveying pipe (8). The end of the drilling equipment away from the drill bit (2) is provided with a slurry discharger (6). The slurry discharger (6) filters and discharges the slurry in the drilling equipment (1) through the circulating fluid filter, and conveys the slurry to the drill bit (2) through the stirring and conveying pipe (8). The drilling equipment (1) is provided with a display device (9), the display device (9) comprising a display screen, a processor and a signal conversion module, the pressure sensor (3) is used to collect solidification parameters of the grouting liquid after grouting, the pressure sensor (3) is connected to the processor via the signal conversion module, and the processor has a standard solidification range value pre-stored therein.

5. The grouting strength and compactness detection device for fractured rock masses according to claim 4, characterized in that, A cavity (10) is provided in the connection column, the cavity (10) is communicated with the through hole, the cavity (10) is communicated with the core storage (5), a volume sensor is provided in the core storage (5), and the volume sensor is connected to the signal conversion module.

6. The grouting strength and compactness detection device for fractured rock masses according to claim 5, characterized in that, The cavity (10) is a cylindrical cavity, and the central axis of the cylindrical cavity coincides with the central axis of the drilling equipment (1).

7. A device for detecting the grouting strength and compactness of fractured rock masses according to claim 4, characterized in that, A number of screws are provided on the bottom plate (11), and the bottom plate (11) is fixed to the connecting pile (4) by the screws.

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