A method for monitoring parameters of a goaf filling body under a roof breaking condition

Abstract

The application discloses a kind of roof broken condition under goaf filling body parameter monitoring method, it is related to mineral exploitation technical field, comprising: along the horizontal direction working face of roof, the monitoring interval corresponding to each roof stability grade is designed on roof;According to the monitoring interval corresponding to the roof stability grade of roof, carry out drilling, drill to direct roof in pseudo roof, set drilling embedding layer in direct roof, and drill to basic roof in direct roof, set drilling embedding layer in basic roof;The inductive ring of split displacement sensor is embedded in drilling embedding layer to measure filling body compression deformation;Cavity groove is set on the ground below inductive ring embedding position, and stress meter is set in cavity groove to measure filling body stress.The application can accurately monitor goaf filling body parameter with adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mineral exploitation, in particular to a method for monitoring parameters of a goaf filling body under a broken roof condition. BACKGROUND

[0002] Solid backfilling coal mining technology is a revolutionary technology of backfilling mining technology, which uses goaf filling body to control the movement of goaf roof, has the advantages of improving resource recovery rate, solid waste disposal and environmental protection, and is the preferred technology for liberating "three below" pressure coal and other stagnant coal resources. The parameters of the goaf filling body of the solid backfilling coal mining technology are important factors to ensure the filling effect and control the filling cost.

[0003] When encountering a broken roof condition, the existing technology for monitoring the parameters of the goaf filling body cannot adapt to the roof of the goaf under the broken roof condition, and when the roof is broken and falls, the monitored filling body parameters will have errors. How to design a filling body parameter monitoring method to adapt to the roof under the broken roof condition is an important problem to be solved. SUMMARY

[0004] The embodiment of the present application provides a method for monitoring parameters of a goaf filling body under a broken roof condition, which can solve the problem of how to design a filling body parameter monitoring method to adapt to the roof under the broken roof condition in the prior art.

[0005] The embodiment of the present application provides a method for monitoring parameters of a goaf filling body under a broken roof condition, which comprises the following steps:

[0006] Under the broken roof condition, the roof of the goaf is divided into multiple roof stability grades and classified; wherein, the classification includes a pseudo roof, a direct roof located above the pseudo roof, and a basic roof located above the direct roof; along the horizontal direction of the roof, a working face is designed on the roof corresponding to the monitoring interval of each roof stability grade; according to the monitoring interval corresponding to the roof stability grade of the roof, a hole is drilled through the pseudo roof into the direct roof, a drilling embedding layer is arranged in the direct roof, and a hole is drilled through the direct roof into the basic roof, and a drilling embedding layer is arranged in the basic roof; after the drilling embedding layer is arranged in the roof, the inductive ring of the split displacement sensor is embedded in the drilling embedding layer to measure the compression deformation of the filling body; a nest groove is arranged on the ground below the inductive ring embedding position, and a stress meter is arranged in the nest groove to measure the stress of the filling body; the split sensor and the stress meter are connected through an armored cable; the split sensor and the stress meter are used to continuously monitor the parameters of the goaf filling body.

[0007] Further, the step of designing the monitoring interval corresponding to each roof stability grade on the roof comprises the following steps:

[0008] According to the hardness of the roof, the roof is divided into hard roof, stable roof, medium stable roof and unstable roof; on the hard roof, the monitoring interval is set to be half of the length of the working face; on the stable roof, the monitoring interval is set to be one fourth of the length of the working face; on the medium stable roof, the monitoring interval is set to be one sixth of the length of the working face; on the unstable roof, the monitoring interval is set to be one eighth of the length of the working face.

[0009] Further, the size of the nest is 800mm*800mm.

[0010] Further, before continuously monitoring the parameters of the goaf filling body, the split type sensor and the stress meter need to be sealed, reinforced and protective filling.

[0011] Further, the sealing, reinforcement and protective filling of the split type sensor and the stress meter include the following specific steps: sealing the connection port of the armored cable by using waterproof foaming agent, and sealing the split type sensor and the stress meter by using waterproof foaming agent; and reinforcing the split type sensor by grouting in the hole.

[0012] Compared with the prior art, the embodiment of the present application has the following beneficial effects:

[0013] Under the condition of roof breaking, along the horizontal direction of the roof, the working face is designed on the roof of the goaf, and the monitoring interval corresponding to each roof stability level is set; according to the monitoring interval corresponding to the roof stability level of the roof, the hole is drilled through the pseudo roof to the immediate roof, the drilling embedding layer is set in the immediate roof, and the hole is drilled through the immediate roof to the basic roof, and the drilling embedding layer is set in the basic roof; the inductive ring of the split type displacement sensor is embedded in the drilling embedding layer in the roof after the drilling embedding layer is set, so as to measure the compression deformation of the filling body; the nest is set on the ground below the inductive ring embedding position, and the stress meter is set in the nest to measure the stress of the filling body; the split type sensor and the stress meter are connected through the armored cable; the split type sensor and the stress meter are used to continuously monitor the parameters of the goaf filling body.

[0014] Among them, considering that the roof will fall under the condition of roof breaking, according to the roof stability level of the roof of the goaf, the drilling position and the drilling embedding layer are adaptively set to install the monitoring equipment; when the hole is drilled into the immediate roof, even if the pseudo roof part falls, it does not affect the monitoring equipment; when the hole is drilled into the basic roof, even if the immediate roof part falls, it does not affect the monitoring equipment; the monitoring of the monitoring equipment is affected by the falling of the roof, and finally the equipment installation position is adaptively selected according to the roof of the goaf under the condition of roof breaking to monitor the parameters of the goaf filling body. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A flow chart provided for the embodiment of the present application;

[0016] Figure 2 A goaf filling body monitoring device layout plan provided for the embodiment of the present application;

[0017] Figure 3 A goaf filling body monitoring device layout A-A sectional view provided for the embodiment of the present application;

[0018] Figure 4 A goaf filling body monitoring device connection mode diagram provided for the embodiment of the present application.

[0019] Reference signs:

[0020] 5-arched goaf, 2-split displacement sensor, 3-stress meter, 4-induction ring, 5-grouting hole, 6-armored cable containing magnetic induction wire, 7-measuring rod, 8-probe, 9-mortar, 10-pressure-resistant waterproof box, 11-base, 12-displacement sensor armored cable, 13-stress sensor armored cable, 14-data acquisition instrument, 15-junction box. DETAILED DESCRIPTION

[0021] In order to make the above objectives, characteristics and advantages of the present application more apparent, obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a sufficient understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0022] Reference Figure 1 The embodiment of the present application provides a goaf filling body parameter monitoring method under roof crushing conditions, comprising the following steps:

[0023] Step one: obtaining the roof occurrence conditions of the goaf under the roof crushing conditions, and dividing the roof into a plurality of roof stability grades and classifying the roof according to the roof occurrence conditions. The occurrence conditions represent the geological features and state of the overburden layer above the goaf as the roof, and the classification includes the pseudo roof, the immediate roof above the pseudo roof and the basic roof above the immediate roof.

[0024] Step two: along the horizontal direction of the roof, designing a monitoring interval corresponding to each roof stability grade on the roof; according to the monitoring interval corresponding to the roof stability grade of the roof, drilling, drilling through the pseudo roof into the immediate roof, setting a drilling embedding layer in the immediate roof, and drilling through the immediate roof into the basic roof, setting a drilling embedding layer in the basic roof.

[0025] Step three: bury the inductive ring of the split displacement sensor in the punching and burying layer in the top plate of the punching and burying layer to measure the compression deformation of the filling body; below the top plate where the inductive ring is buried, set the nest groove on the ground and set the stress meter in the nest groove to measure the stress of the filling body; the split sensor and the stress meter are connected through the armored cable. The split sensor and the stress meter are sealed, reinforced and protected, specifically including: sealing the connection port of the armored cable through the waterproof foaming agent, and sealing the split sensor and the stress meter with the waterproof foaming agent; reinforcing the split sensor by grouting in the hole. The goaf is filled, and the split sensor and the stress meter are used to continuously monitor the parameters of the filling body in the goaf.

[0026] In the formula, the roof is divided into hard roof, stable roof, medium stable roof and unstable roof according to the hardness of the roof; on the hard roof, the monitoring interval is set to be one half of the length of the working face; on the stable roof, the monitoring interval is set to be one fourth of the length of the working face; on the medium stable roof, the monitoring interval is set to be one sixth of the length of the working face; on the unstable roof, the monitoring interval is set to be one eighth of the length of the working face.

[0027] The specific execution steps are explained as follows:

[0028] (1) Field investigation, analyze the occurrence conditions and integrity of the roof in the goaf behind the support, and obtain the direct caving height of the roof in different regions.

[0029] (2) Design of monitoring scheme: according to the roof stability grade, design the monitoring interval; according to the direct caving height of the roof, design the inductive ring burying layer of the split displacement sensor. Specifically, when the direct caving height of the roof is in the pseudo roof, the punching and burying layer is designed in the immediate roof; when the direct caving height of the roof is in the immediate roof, the punching and burying layer is designed in the basic roof.

[0030] (3) Reserve pipeline laying space, fully tamp the position left and right adjacent to 4 supports behind the support, then move the support 3 rows forward, and only fill the non-installation area during the support moving period.

[0031] (4) Clean the gangue and arrange the nest groove, arrange the nest groove at the bottom of the installation position of the monitoring equipment, the size of the nest groove is 800mmx800mm, the depth requirement is to see the bottom (plate) or can reserve a certain thickness of gangue bottom, and clean the nest groove bottom.

[0032] (5) Installation of monitoring equipment: vertically punch a hole upward in the middle of the adjacent support interval of the installation position, arrange the split displacement sensor in the hole; arrange the stress meter in the nest groove close to the goaf side of the support base; connect the split displacement sensor and the stress meter through the armored cable, and connect them together on the junction box in the pressure-resistant waterproof box.

[0033] (6) Monitoring equipment safety protection, using waterproof foaming agent to seal the junction of cable and monitoring equipment, split displacement sensor, stress meter, pressure-resistant waterproof box, and grouting reinforcement of the arranged borehole.

[0034] (7) Transmission line layout, after the cable of monitoring equipment is integrated via the junction box, the armored cable in the gob behind the support is laid under the top beam of the support, and the armored cable inside the roadway is hung at 2 / 3 of the height of the roadway side.

[0035] (8) Equipment debugging, within 500mm of the monitoring equipment, the protective part is filled; the equipment debugging specifically refers to that after the equipment is installed, the other positions of the working face start normal filling; the 3-5 groups of supports on the left and right of the equipment installation position continue to maintain within 2 step distances, only gangue is placed, the tamping mechanism is not started, and when the monitoring position is at a position about 500mm outside the tamping head full stroke of the tamping machine and the 3-5 groups of supports on the left and right of the equipment installation position are moved twice, the 3-5 groups of supports on the left and right of the equipment installation position can be normally filled.

[0036] (9) Continuous monitoring, normal filling. The filling parameters include filling body stress and filling body compression deformation, and the filling body parameter monitoring equipment includes a stress meter and a split displacement sensor.

[0037] The application takes split measurement as the core, forms a whole time sequence method process design of monitoring preparation, monitoring equipment installation, monitoring debugging, mainly includes 8 steps of field investigation, design of monitoring scheme, monitoring equipment installation preparation, monitoring equipment installation, monitoring equipment safety protection, data transmission safety protection, equipment debugging and continuous monitoring, and finally realizes safe and reliable monitoring of the gob filling body parameters under the condition of broken roof and sustainable transmission of data. The application expands the monitoring scene of filling body parameters of filling mining, provides a scientific, reasonable, safe and reliable method for monitoring of gob filling body parameters under the condition of broken roof, and provides bottom parameters for optimization of efficiency, benefit, effect and engineering design of filling mining, and helps high-quality and wide-range development of filling mining technology.

[0038] A specific implementation is as follows:

[0039] (1) Field investigation, analysis of roof occurrence conditions and integrity of the gob behind the support, and direct roof falling height of different regions.

[0040] (2) Design of monitoring scheme, evenly and intervally arranging filling body parameter monitoring equipment (split displacement sensor 2 and stress meter 3) in the working face of the roof integrity region, the interval is 30m, in the roof broken region, one set of monitoring equipment (split displacement sensor 2 and stress meter 3) is supplemented in the middle close to the broken region, since the falling region only affects the pseudo roof, the split displacement sensor 2 is designed to be buried at the direct roof.

[0041] (3) Installation preparation, reserved pipeline laying space and gangue cleaning arrangement installation nest.

[0042] (4) Monitoring equipment installation, split type displacement sensor 2 is installed in hydraulic support, stress meter 3 is arranged at the rear of hydraulic support, split type displacement sensor and stress meter are connected through displacement sensor armored cable 12 and stress sensor armored cable 13, and are connected to junction box 15 in pressure-proof waterproof box 10.

[0043] (5) Safety protection of monitoring equipment, the intersection of waterproof foaming agent sealed cable (displacement sensor armored cable 12 and stress sensor armored cable 13) and monitoring equipment (split type displacement sensor 2 and stress meter 3), split type displacement sensor 2 and pressure-proof waterproof box 10 are used, and the arranged drill hole 5 is reinforced by mortar 9. The arrangement of monitoring equipment is shown in Figure 2 and Figure 3 , and the connection mode is shown in Figure 4

[0044] (6) Safety protection of data transmission equipment, armored cable in working face is laid in the rear of support, and armored cable in roadway is hung on the roadway side.

[0045] (7) Equipment debugging, protective partial filling.

[0046] (8) Normal filling, continuous monitoring.

[0047] In step (4), the split type displacement sensor includes 2, sensing ring 4, armored cable 6 containing magnetic induction wire, measuring rod 7, base 11 and data acquisition instrument 14. The data acquisition instrument 14 of split type displacement sensor 2 is located in pressure-proof waterproof box 10.

[0048] In step (7), the equipment debugging specifically means that after the equipment is installed, the other positions of the working face start normal filling; 3-5 groups of supports on the left and right of the equipment installation position continue to maintain only gangue in 2 step distances, and the tamping mechanism is not started to tamp, so as to avoid that the tamping head extrudes gangue and pushes down or directly pushes to the top plate dynamometer (column). When the 3-5 groups of supports on the left and right of the equipment installation position are moved for 2 times and the position of the dynamometer (column) is ensured to be 500 mm outside the whole stroke of the tamping head of the tamping machine, the 3-5 groups of supports on the left and right of the equipment installation position can be normally filled.

[0049] ​The application effectively solves the problem that the parameters of the goaf filling body under the condition of roof crushing are difficult to be safely, accurately and efficiently monitored, through targeted investigation of the roof collapse condition, design of the corresponding installation arrangement method, and innovative selection of the split type displacement sensor and installation of the split type displacement sensor between the hydraulic supports, the equipment is completely located under the protection of the hydraulic support during the installation process, through the innovation of the process, the monitoring of the goaf filling body parameters under the condition of roof crushing becomes a reality, and the activity range of the overburden strata of the stope is effectively quantified, which is beneficial to the development of the solid filling technology.

[0050] The above-mentioned embodiments only express several embodiments of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A method for monitoring parameters of a backfill body in a goaf under a roof fall condition, characterized in that, The method comprises the following steps: Under the condition of roof breaking, the roof of the goaf is divided into various roof stability grades and classified; wherein, the classification comprises a pseudo roof, a direct roof above the pseudo roof, and a basic roof above the direct roof; Along the horizontal direction of the roof, a monitoring interval corresponding to each roof stability grade is designed on the roof; According to the monitoring interval corresponding to the roof stability grade, a hole is drilled through the pseudo roof to the direct roof, a drilling and embedding layer is arranged in the direct roof, and a hole is drilled through the direct roof to the basic roof, a drilling and embedding layer is arranged in the basic roof; according to the roof stability grade, the monitoring interval is designed; according to the direct roof falling height, the inductive ring embedding layer position of the split displacement sensor is designed; specifically, when the direct roof falling height is in the pseudo roof, the drilling and embedding layer position is designed in the direct roof, and when the direct roof falling height is in the direct roof, the drilling and embedding layer position is designed in the basic roof; In the roof with the drilling and embedding layer arranged, the inductive ring of the split displacement sensor is embedded in the drilling and embedding layer to measure the compression deformation of the filling body; a nest groove is arranged on the ground below the inductive ring embedding position, and a stress meter is arranged in the nest groove to measure the stress of the filling body; the split displacement sensor and the stress meter are connected through an armored cable; The split displacement sensor and the stress meter are used to continuously monitor the goaf filling body parameters.

2. The method for monitoring the parameters of the gob packing body under the roof breaking condition according to claim 1, characterized in that, The monitoring interval corresponding to each roof stability grade is designed on the roof, and the specific steps comprise: According to the hardness of the roof, the roof is divided into hard roof, stable roof, medium stable roof and unstable roof; On the hard roof, the monitoring interval is set to one half of the length of the working face; On the stable roof, the monitoring interval is set to one fourth of the length of the working face; On the medium stable roof, the monitoring interval is set to one sixth of the length of the working face; On the unstable roof, the monitoring interval is set to one eighth of the length of the working face.

3. The method of monitoring the parameters of the backfill in the goaf under the roof breaking condition according to claim 1, characterized in that, The size of the nest groove is 800mm×800mm.

4. The method of monitoring the parameters of the backfill in the goaf under the roof breaking condition according to claim 1, characterized in that, Before continuously monitoring the goaf filling body parameters, the split displacement sensor and the stress meter need to be sealed, reinforced and protective filled.

5. The method of monitoring the parameters of the backfill in the goaf under the roof breaking condition according to claim 4, characterized in that, The specific steps of sealing, reinforcing and protective filling the split displacement sensor and the stress meter comprise: The connection port of the armored cable is sealed by a waterproof foaming agent, and the split displacement sensor and the stress meter are sealed by the waterproof foaming agent; The split displacement sensor is reinforced by hole grouting.

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