CN-121976847-A - Separation layer grouting system and method capable of preventing deformation failure of grouting pipe pulling, bending, torsion and shearing combination

CN121976847ACN 121976847 ACN121976847 ACN 121976847ACN-121976847-A

Abstract

The invention discloses a separation layer grouting system and a separation layer grouting method capable of preventing deformation failure of a grouting pipe pulling, pressing, bending and shearing combination, wherein the system comprises a grouting pipe assembly and a grouting device, the grouting pipe assembly comprises grouting pipes of a multi-section structure, two adjacent grouting pipes are connected in a sealing mode through a spherical hinge connecting assembly, each grouting pipe comprises an upper telescopic grouting section and a lower telescopic grouting section from top to bottom, the upper telescopic grouting section is connected with the sleeve through a coaxial arrangement in a mounting mode, the sleeve is respectively connected with the upper telescopic grouting section and the lower telescopic grouting section in a damping matching sliding mode, grouting holes penetrating through the pipe walls of the grouting pipes are formed in the sleeve inner parts of the upper telescopic grouting section and the lower telescopic grouting section, the sleeve is in a state of plugging the grouting holes, and a grouting output end of the grouting device is connected with the grouting holes in the sleeve inner part of the top of the grouting pipe through a pipeline. The invention can prevent the failure condition of the grouting pipe caused by the combination deformation of the pulling, pressing, bending and twisting of the bearing stratum to the maximum extent, thereby realizing the effect of ensuring the separation layer grouting.

Inventors

MA ZHANGUO
GUO MIN
WANG KAI
ZHANG HANFENG
WANG MINGHUI
LI CHENGGUO
ZHANG FAN
GONG PENG
Ren Baoheng
TANG FURONG
LI CHUN
LIU YU
LIAN JIE
CHEN KAI

Assignees

中国矿业大学

Dates

Publication Date: 20260505
Application Date: 20260324

Claims (10)

1. A separation layer grouting system capable of preventing deformation failure of a grouting pipe pulling, pressing, bending and shearing combination comprises a grouting pipe assembly and a grouting device, and is characterized in that the grouting pipe assembly comprises a plurality of grouting pipes (5) of a multi-section structure, each grouting pipe (5) comprises an upper telescopic grouting section and a lower telescopic grouting section which are coaxially arranged from top to bottom, the upper telescopic grouting section and the lower telescopic grouting section are arranged in a disconnected mode, the upper telescopic grouting section and the lower telescopic grouting section are connected through a sleeve (4) which is coaxially arranged, the sleeve (4) is respectively connected with the upper telescopic grouting section and the lower telescopic grouting section in a damping fit sliding mode, a plurality of grouting holes (3) penetrating through the pipe wall of the grouting pipe (5) in the radial direction are formed in the sleeve inner part of the upper telescopic grouting section and the sleeve inner part of the lower telescopic grouting section, the grouting holes (3) are arranged at intervals along the circumferential direction and the axial direction of the grouting pipe (5), in a pre-buried state, the sleeve (4) is in a state of plugging the grouting holes (3), two adjacent grouting pipes (5) are connected with the top end of the grouting pipe (5) through a sealing hinge assembly (6) in a sealing joint mode, and the grouting pipe is connected with the top end of the grouting pipe (1) through the sealing hinge assembly.
2. The system of claim 1, further comprising a monitoring device comprising a server, a digital twin display, and a sensor assembly disposed on the grouting pipe assembly and electrically connected to the server, the sensor assembly comprising a flow meter, a pressure sensor, a displacement sensor, and a piezoelectric sensor.
3. The separation layer grouting system capable of preventing deformation failure of the grouting pipe pulling, bending, twisting and shearing combination according to claim 1 or 2, wherein a plugging end cover is arranged at the bottom end of the grouting pipe (5) positioned at the bottommost part of the grouting pipe assembly in a sealing manner, and an on-off valve which is communicated with the inner cavity of the grouting pipe (5) and can be controlled to open and close is further arranged on the plugging end cover.
4. The separation layer grouting system capable of preventing deformation failure of a grouting pipe pulling, bending and torsion shearing combination according to claim 1 or 2 is characterized in that the bottom end of a lower telescopic grouting section of an upper grouting pipe (5) is axially and fixedly connected with a ball hinge connecting assembly (6), the top end of an upper telescopic grouting section of a lower grouting pipe (5) is axially and fixedly connected with the ball hinge connecting assembly (6), ball structures are coaxially arranged at the bottom end of the lower telescopic grouting section of the upper grouting pipe (5) and the top end of the upper telescopic grouting section of the lower grouting pipe (5), the ball hinge connecting assembly (6) comprises two ball socket structures which are symmetrically arranged up and down, the longitudinal section of each ball socket structure is a major arc structure, the two ball socket structures are vertically communicated through a through channel, and damping friction components are further arranged between the ball structures and the ball socket structures which are cooperatively arranged.
5. The separation layer grouting system capable of preventing deformation failure of a grouting pipe pulling, bending, twisting and shearing combination according to claim 1 or 2 is characterized in that a hemispherical structure is coaxially arranged at the bottom end of a lower telescopic grouting section of an upper grouting pipe (5) and the top end of an upper telescopic grouting section of a lower grouting pipe (5), longitudinal sections of the hemispherical structures are in a minor arc structure, a spherical hinge connecting assembly (6) comprises a kalan I and a kalan II which are symmetrically and fixedly arranged, spherical structures matched with the hemispherical structures of the grouting pipes (5) are formed on the inner surfaces of the kalan I and the kalan II, a pressure spring is further positioned between the hemispherical structures at the bottom end of the lower telescopic grouting section of the upper grouting pipe (5) and the hemispherical structures at the top end of the upper telescopic grouting section of the lower grouting pipe (5), and a damping friction component is further arranged between the hemispherical structures and the spherical structures.
6. The separation layer grouting system capable of preventing deformation failure of the grouting pipe pulling, bending, twisting and shearing combination according to claim 1 or 2, wherein the grouting holes (3) are provided with one-way valves which only allow the slurry to flow outwards.
7. The delamination-grouting system for preventing deformation failure of the grouting pipe pulling, bending, twisting and shearing combination as claimed in claim 1 or 2, wherein the outer surface of the sleeve (4) is provided with a positioning boss extending in the radial direction.
8. A delamination and grouting method based on a delamination and grouting system capable of preventing deformation failure of a grouting pipe by pulling, bending, twisting and shearing combination as claimed in claim 1, which is characterized by comprising the following steps: a. The method comprises the steps of preparing a well to be built, detecting and determining the burial depth, thickness and burial range of a layer to be mined, detecting and determining the number, thickness and lithology of overlying strata of the layer to be mined, then determining a geological mathematical model, based on the geological mathematical model, determining the number of sections of grouting pipes (5), the setting position of each spherical hinge connecting component (6), the length of each grouting pipe (5) and the position of a telescopic grouting section, enabling the telescopic grouting section of each grouting pipe (5) to be positioned in the area of the separation layer, enabling each spherical hinge connecting component (6) to be positioned in the area of the separation layer, simulating goaf caving to form a separation layer by numerical simulation, determining the approximate area, the range and the volume of each separation layer, determining the setting position, the depth and the number of a separation layer grouting vertical shaft according to the approximate area of each separation layer, determining the number of the overlying strata, lithology and the burial depth of each separation layer, determining the setting position of each spherical hinge connecting component (6), the length of each grouting pipe (5) and the position of a telescopic grouting section according to the depth of each grouting pipe (5), enabling the telescopic grouting section of each grouting pipe (5) to be positioned in the area, enabling the telescopic grouting section of each spherical hinge connecting component (6) to be positioned in the separation layer to be positioned in the area, and the large adjacent to be positioned in the separation layer, determining the diameter of each grouting hole (3) and the corresponding separation layer connecting volume according to the size, and each grouting pipe (5) is installed and connected sequentially through a spherical hinge connecting component (6) to form an integral grouting pipe component; b. And (3) well construction, namely according to the determined setting position, diameter and depth of the separation layer grouting vertical shaft, setting a grouting vertical shaft from the ground to the designed separation layer grouting position, then, putting a grouting pipe assembly into the separation layer grouting vertical shaft, enabling a bottom end flowtube of the grouting pipe assembly to lean against the bottom of the well, finally, injecting cement mortar between the well wall of the separation layer grouting vertical shaft and the grouting pipe assembly for well cementation, and connecting the slurry output end of the grouting device with a top grouting hole (1) of the grouting pipe (5) through a pipeline after the cement mortar is solidified. C. And (3) separating layer grouting, namely along with the pushing of a working surface, a goaf is formed after the mining layer is mined, the space displacement of the caving rock mass of the goaf and the supporting effect on overlying strata conduct upwards layer by layer, a proper amount of high-pressure water is continuously injected into a grouting pipe (5) through a grouting device, and after the high-pressure water actively extrudes out of a separating layer space, water injection is stopped and slurry is continuously injected into the grouting pipe (5).
9. The method of claim 8, wherein the system further comprises a monitor device comprising a server, a digital twin display, and a sensor assembly disposed on the grouting pipe assembly and electrically connected to the server, the sensor assembly comprising a flowmeter, a pressure sensor, a displacement sensor, and a piezoelectric sensor; In the step c, the time of the separation layer grouting is controlled in a feedback way through a monitoring device.
10. The method according to claim 8, wherein in the step a, the depth of the separation layer grouting vertical shaft is determined according to the mining process of the layer to be mined.

Description

Separation layer grouting system and method capable of preventing deformation failure of grouting pipe pulling, bending, torsion and shearing combination Technical Field The invention relates to a separation layer grouting system and method, in particular to a separation layer grouting system and method capable of preventing deformation failure of a grouting pipe in a pulling, pressing, bending and twisting combination mode, and belongs to the technical field of geotechnical engineering and mining engineering. Background In underground mineral exploitation, mine underground exploitation is still a main exploitation mode, taking coal exploitation as an example, and underground exploitation accounts for 60% of world coal mine exploitation. In the underground mining process of the underground mine layer, a large-area underground goaf is often left after the underground mine layer is mined, an overlying rock layer originally supported by the mine layer loses support and moves, deforms and breaks towards the goaf under the action of self gravity and ground stress, and the process starts from the position right above the goaf, is conducted upwards layer by layer, finally reaches the ground surface, and forms ground surface subsidence. The surface subsidence not only can destroy farmland and ecosystems (lead to farmland ponding, salinization, no cultivation, vegetation death, water and soil loss aggravation and the like), but also can threaten buildings and infrastructure (lead to cracks, inclination, collapse and the like of railways, highways, high-voltage towers, civil houses and the like), and even can cause secondary geological disasters (induce landslide and land cracks, change local hydrogeological conditions, pollute groundwater resources and the like). The separation layer grouting technology is an active subsidence reducing technology aiming at ground surface subsidence, and is realized in a mode of drilling holes in the ground and injecting slurry into a separation layer space formed by mining under high pressure to form a manual 'strut' for supporting an overlying rock layer of a goaf. However, the existing separation layer grouting technology generally adopts a 'three-in-one' rigid structure, namely, after grouting and drilling are completed, a sleeve is put into a hole, and an annular space between the sleeve and surrounding rock wall is completely sealed by cement paste, so that the sleeve, a cement sheath and the rock stratum form a tightly connected whole. When the underground mining activities are started, the overlying strata can move, bend and even break, especially at the strata interfaces with larger lithology differences, the upper strata and the lower strata can slide relatively in opposite directions or at different speeds, and further shear stress can be applied to the casing which is fixedly connected with the strata, when the strata are obviously dislocated along a certain interface (such as the interfaces between the bedrock and the overburden and the interfaces between the bedrock and the lithology strata), the casing can bear huge shear stress near the interface, and once the stress exceeds the shear strength of the casing, the casing can be subjected to shear damage. The consequences of shear failure often lead to direct disruption of the grouting channel (shrinkage or fracture of the casing, blockage of the grouting pipeline due to light weight, abnormal rise of the grouting pump, incapability of normal grouting; complete disruption of the grouting channel due to heavy weight, scrapping of the drilling), and "running out" of slurry (after fracture of the casing, high-pressure slurry can rush into non-target stratum from the fracture, most typically, if the fracture is located near the junction of the bedrock and the overburden, slurry can leak along the thin weak surface, namely "run out", even run to places several kilometers away from the grouting holes, causing huge material waste and environmental pollution), and even aggravate surface subsidence (if the casing failure is not found in time and high-pressure grouting is continued, the pressure cannot be effectively applied to the target delamination area, but instead the critical layer may be pressed to cause premature fracture, resulting in surface subsidence, and complete violation of the primary purpose of grouting subsidence). In order to solve the above problems, in the prior art, a mode of adding an inner pipe with a small primary caliber in a technical sleeve as a grouting pipe is adopted, and the inner pipe also adopts a structure of a multi-layer sleeve with sequentially reduced caliber and sleeved connection, so that the small-caliber pipe is utilized to resist certain stratum movement with stronger flexibility and deformation resistance. Although this approach may enhance the shear resistance of the casing itself to some extent, the above-described problems still occur when the shear stress exceeds the shear strength