CN116291398A - Comprehensive detection method for height of water-guiding fracture zone under condition of shallow foundation rock of shallow buried thick soil layer - Google Patents
Comprehensive detection method for height of water-guiding fracture zone under condition of shallow foundation rock of shallow buried thick soil layer Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 68
- 238000001514 detection method Methods 0.000 title claims abstract description 24
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 158
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- 238000000034 method Methods 0.000 claims abstract description 37
- 238000011161 development Methods 0.000 claims abstract description 36
- 208000010392 Bone Fractures Diseases 0.000 claims description 57
- 206010017076 Fracture Diseases 0.000 claims description 57
- 238000012360 testing method Methods 0.000 claims description 47
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/117—Detecting leaks, e.g. from tubing, by pressure testing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention provides a comprehensive detection method for the height of a water-guiding fracture zone under the condition of a shallow foundation rock of a shallow buried thick soil layer. According to the method, by combining crack observation of the soil layer observation holes and the bedrock layer observation holes, the development position of the water guide crack zone of the thin bedrock of the thick soil layer can be accurately detected, the accuracy of the ground drilling method for observing the height of the water guide crack zone is improved, the utilization rate of ground drilling is improved, and the method has important significance for preventing and controlling water damage of the top plate.
Description
Technical Field
The invention relates to the technical field of water guide crack detection, in particular to a comprehensive detection method for the height of a water guide crack zone under the condition of a shallow foundation rock of a shallow buried thick soil layer.
Background
After the coal seam is mined, the roof overlying strata are destroyed from bottom to top to form a collapse zone and a water guide crack zone, if the water guide crack zone is swept to an overlying aquifer to form a water gushing channel, water in the aquifer can enter a mine to cause water damage accidents, therefore, determining the development height of the water guide crack zone is a key parameter for water damage prevention, control and water retention coal mining scheme design, is an important foundation for solving the contradiction between efficient development of coal resources and safety and water resource protection, and has extremely important significance for coal mine safety production, green mining and water resource protection.
The current common method for measuring the height of the fracture zone by combining the ground drilling comprises the following steps: the direct measurement method of the flushing fluid leakage quantity judges the height of the water guide fracture zone through the remarkable change of the circulating flushing fluid leakage quantity in the drilling process; and (3) a drilling television image method, wherein the height of the water guide crack zone is judged by photographing or video monitoring of the development morphological characteristics of the crack of the hole wall. However, the above method is generally used for detecting the bedrock cracks, and for the thick soil layer thin bedrock, the method for detecting the cracks of the bedrock is not comprehensive enough, the accuracy of the height of the water guiding crack zone cannot be ensured, and an effective roof water damage prevention and control effect is difficult to play, so that the traditional method is not suitable for detecting the development height of the water guiding crack zone of the thick soil layer shallow burial depth.
Disclosure of Invention
The invention provides a comprehensive detection method for the height of a water-guiding fracture zone under the condition of a shallow-buried thick soil layer thin bedrock, which is used for solving the defect that in the prior art, the detection accuracy of the development position of the water-guiding fracture zone is low due to the fact that only the bedrock is subjected to fracture detection, and realizing the accurate detection of the development position of the water-guiding fracture zone of the thick soil layer thin bedrock.
The invention provides a comprehensive detection method for the height of a water-guiding fracture zone under the condition of a shallow foundation rock of a shallow buried thick soil layer, which comprises the following steps:
determining the position of a water guide crack zone observation hole;
obtaining an observation hole, wherein the observation hole is provided with a soil layer and a base stratum;
monitoring the leakage amount of the flushing liquid and observing the pressurized water test on the observation pore soil layer, and acquiring the leakage amount data and the water permeability data of the flushing liquid with different depths of the observation pore soil layer;
monitoring the leakage amount of the flushing fluid and observing the pressurized water test on the observation hole base stratum, and acquiring the leakage amount data and the water permeability data of the flushing fluid with different depths of the observation hole base stratum;
and determining the development position of the water-guiding fracture zone of the thin bedrock of the thick soil layer based on the flushing fluid leakage data and the water permeability data of the observation hole stratum, wherein the rapid change area of the flushing fluid leakage data is regarded as the development position of the water-guiding fracture zone, and the area with the water permeability data larger than the preset water permeability is regarded as the development position of the water-guiding fracture zone.
According to one embodiment of the invention, the step of determining the development position of the water-conducting fracture zone of the thin bedrock of the thick soil layer based on the flushing fluid leakage data comprises the following steps:
drawing a curve of the leakage amount of the flushing liquid along with the change of the hole depth, finding out a quick change area of the leakage amount of the flushing liquid, identifying an area with the average leakage amount larger than 0.5L/(s.m) as a micro fracture zone, identifying an area with the average leakage amount larger than 1L/(s.m) as a general fracture zone, and identifying an area with the average leakage amount larger than 1.5L/(s.m) as a serious fracture zone; the micro fracture zone area is considered to be the area where the fracture zone vertex is located.
According to one embodiment of the invention, the step of determining the development position of the water-conducting fracture zone of the thin bedrock of the thick soil layer based on the water permeability data comprises the following steps:
the preset water permeability is set to be 0.5Lu, and the area with the water permeability greater than 0.5Lu is regarded as the development position of the water guide fracture zone.
According to one embodiment of the present invention, the method further comprises a borehole water level observation step, comprising:
respectively observing the water level of the drilled holes in the drilling process of the observation hole soil layer and the observation hole bedrock layer, and obtaining water level and water level measuring time data corresponding to different depths of the observation holes; and (5) identifying the water level rapid change area as a water guide crack zone development position.
According to one embodiment of the present invention, the method further comprises a borehole television observation step for the observation hole soil layer and the observation hole bedrock layer, comprising:
performing crack detection on the observation hole soil layer and the observation hole base rock stratum from top to bottom by using a drilling television probe to obtain lithology, joint and crack positions and characteristics in the hole wall;
for the observation hole soil layer, determining the area with the average width of the cracks reaching 25mm as the vertex of the water guide crack zone, wherein the number of the cracks reaches 3 pieces/m, the cracks with the inclination angle larger than 50 degrees account for 50% of the total amount of the area cracks;
for the observation hole base rock stratum, determining the area with the average crack width of 30mm as the vertex of the water guide crack zone, wherein the number of cracks reaches 6 pieces/m, the cracks with the inclination angle of more than 60 degrees account for 50% of the total area of the cracks.
According to one embodiment of the present invention, the determining the location of the water-guiding fracture zone observation hole includes:
2 observation holes of the water guide crack zone after mining are distributed on the ground surface within the range of the working surface to be detected, the distance between two holes and the initial mining line of the stoping working surface is larger than 30m, the distance between the two holes and the final mining line is larger than 15m, one hole is close to the inner side of the return air lane, and the other hole is close to the inner side of the transport lane.
According to one embodiment of the present invention, further comprising:
and after the observation step is completed on the observation hole soil layer and before the observation hole stratum is drilled, casing pipe setting and pipe fixing sealing are carried out on the soil layer.
According to one embodiment of the invention, the rinse liquid leakage monitoring step comprises:
when the flushing fluid forms circulation after drilling, the water level of the primary water source box is measured, the drilling time and the drilling depth are recorded, the measurement and the recording are carried out once every 0.5m, the actual footage is measured after one time is completed, and the actual footage is measured until the flushing fluid is observed to be lost completely without water return.
According to one embodiment of the present invention, the water pressure test observation step includes:
placing the double plugs at the positions to be tested in the holes, carrying out a water pressing test in the holes from top to bottom by using the double plugs in a segmented mode, wherein the test length of the double plugs is the distance from the top of the lower plug to the bottom of the upper plug, and injecting water into the test section through a drill rod by using a drilling machine water pump to obtain the pressure value and the flow value of the test section.
According to one embodiment of the present invention, the water permeability calculation formula is:
q＝Q/L×P
wherein q is the water permeability (Lu) of the test section; q is the flow value (L/min) of the test section; l is the test section length (m); p is the test section pressure (MPa).
According to the comprehensive detection method for the height of the water guide fracture zone under the condition of the shallow-buried thick soil layer and the thin bedrock, provided by the invention, the position of the observation hole of the water guide fracture zone is determined, so that the observation hole is obtained, and the observation hole is provided with a soil layer and a bedrock layer; monitoring the leakage amount of the flushing fluid and observing the pressurized water test on the observation pore soil layer, and obtaining the leakage amount data and the water permeability data of the flushing fluid with different depths of the observation pore soil layer; monitoring the leakage amount of the flushing fluid and observing the pressurized water test on the observation hole base stratum, and obtaining the leakage amount data and the water permeability data of the flushing fluid with different depths of the observation hole base stratum; and determining the development height of the water guiding fracture zone of the thin bedrock of the thick soil layer based on the flushing fluid leakage data and the water permeability data, determining a rapid change area of the flushing fluid leakage data as a development position of the water guiding fracture zone, and determining an area with the water permeability data larger than the preset water permeability as the development position of the water guiding fracture zone. According to the method, by combining crack observation of the soil layer observation holes and the bedrock layer observation holes, the development position of the water guide crack zone of the thin bedrock of the thick soil layer can be accurately detected, the accuracy of the ground drilling method for observing the height of the water guide crack zone is improved, the utilization rate of ground drilling is improved, and the method has important significance for preventing and controlling water damage of the top plate.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the steps of the method for comprehensively detecting the height of a water-guiding fracture zone under the condition of shallow bedrock of a shallow buried thick soil layer;
FIG. 2 is a schematic view of a borehole location arrangement provided by the present invention;
FIG. 3 is a schematic illustration of a borehole construction provided by the present invention;
FIG. 4 is a schematic illustration of a pressurized water test provided by the present invention;
fig. 5 is a schematic view of a borehole television observation provided by the present invention.
Reference numerals:
1. drilling holes; 2. a return airway; 3. a line is adopted initially; 4. a transport lane; 5. a final mining line; 6. a drill bit; 7. a drill rod; 8. double-plug capsules; 9. a probe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Specific embodiments of the present invention are described below in conjunction with fig. 1-5.
As shown in fig. 1, the embodiment of the invention provides a comprehensive detection method for the height of a water-guiding fracture zone under the condition of shallow-buried thick soil layer and thin bedrock, which comprises the following steps:
the first step: determining the position of a water guide crack zone observation hole;
specifically, the method comprises the step of drilling position and parameter determination.
Determining the position of the drilling hole 1: as shown in fig. 2, 2 observation holes of the water-guiding crack zone after mining are distributed on the ground surface within the range of the working surface to be detected, the distance between the two holes and the initial mining line 3 of the stoping working surface is larger than 30m, the distance between the two holes and the final mining line 5 is larger than 15m, one hole is close to the inner side of the return air lane 2, and the other hole is close to the inner side of the transportation lane 4, so that the general rule of overburden rock damage is reflected.
Determining drilling 1 parameters: the aperture diameter of the hole is 91-108 mm, the clay layer drilling aperture diameter is 91mm, the bedrock drilling aperture diameter is 91mm, the reaming aperture diameter of the clay layer for the lower casing is 130mm, the drilling inclination angle is less than 3 degrees, and the final hole depth enters the coal seam bottom plate.
And a second step of: drilling a soil layer to obtain a soil layer observation hole, monitoring the leakage amount of flushing fluid and observing a pressurized water test on the soil layer observation hole, and obtaining the leakage amount data and the water permeability data of the flushing fluid with different depths of the soil layer observation hole.
As shown in fig. 3, drilling construction is carried out on the working surface to be measured, the drilling position of the earth surface is determined, a drill bit 6 is drilled from the earth surface, and a water guide crack zone height detection hole is drilled to the earth layer bottom interface. The perforation adopts a twist drill with 91-108 mm, and adopts a core pipe with 91mm to drill after drilling to a clay layer, each footage is controlled to be less than 6m, the core rate of the clay layer is more than or equal to 70%, and the obtained clay samples are numbered according to the hole depth. And synchronously observing the leakage quantity of the flushing fluid and the drilling water level in the soil layer drilling process.
And after the flushing fluid leakage and the borehole water level are observed, monitoring soil layer data, and casing and fixing the pipe to seal the loose layer. And after the soil layer is drilled, carrying out a water pressing test and a drilling television observation according to the sequence. And (5) after the observation is completed, sleeve-setting and pipe-fixing sealing are carried out on the soil layer. And the bottom of the sleeve is required to enter 5-10 m below the bedrock top interface, cement slurry is adopted to fix the pipe, after the cement is solidified, the hole is cleaned until the depth of the cleaned hole exceeds the depth below the sleeve bottom opening by not less than 200mm, then the water stopping effect is checked, and the water level change in the pipe is not more than 40mm after 8h, so that the water stopping is qualified.
Thirdly, drilling a bedrock layer to obtain a bedrock layer observation hole, monitoring the flushing fluid leakage and observing a pressurized water test on the bedrock layer observation hole, and obtaining the flushing fluid leakage data and the water permeability data of different depths of the bedrock layer observation hole.
The base stratum is drilled by adopting a core pipe with 91mm, each penetration is controlled to be less than 6m, the soil layer coring rate is more than or equal to 70%, and the obtained rock samples are numbered according to the hole depth. And synchronously observing the leakage quantity of the flushing fluid and the drilling water level in the drilling process of the bedrock layer.
And after the drilling of the bedrock layer is finished, carrying out a water pressing test, a drilling television observation and monitoring the layer data of the bedrock layer.
In this embodiment, the step of monitoring the leakage of the rinse liquid specifically includes: after the drill was started, the water level in the water source tank was measured once as the flushing fluid was circulated, and the drill time, drill depth, and 0.5m each time the drill was started were measured and recorded. When the leakage becomes large, it can be measured and recorded once in a size of 0.3 m. After one round is completed, the actual footage is measured for <6m until the situation that all flushing liquid is lost and water is not returned is observed.
Analyzing the monitoring result of the leakage of the flushing liquid: drawing a curve of the leakage amount of the flushing liquid along with the change of the hole depth, finding out a region with rapid change of the leakage amount of the flushing liquid, identifying the region as a micro fracture zone if the average leakage amount of the region is larger than 0.5L/(s.m), identifying a general fracture zone of the fracture if the average leakage amount of the region is larger than 1L/(s.m), and identifying a serious fracture zone if the average leakage amount of the region is larger than 1.5L/(s.m). And judging the micro fracture zone area as the area where the fracture zone vertex is located.
In this embodiment, the drilling water level observation steps are: in the drilling process, the water level in the drill hole is measured after the drill hole is started and before the drill hole is drilled down. When the drilling stop time is long, the water level should be observed every 5-10 min. The water level is required to be observed, the hole depth, the water level and the water level measuring time are simultaneously recorded, and the water level value is required to be accurate to two decimal places (in meters).
The observation procedure for the pressurized water test in this example is as follows:
as shown in fig. 4, the test procedure: preliminarily determining a rough range of the development height of the water guide fracture zone through leakage and water level change; the method comprises the steps of performing a water pressure test on the range, firstly connecting the top of an upper plug with a drill rod 7, placing a double-plug capsule 8 into a hole to be tested by using the drill rod 7, and after the double-plug capsule 8 is fixed in position, inflating (water) to press the double-plug capsule 8 until the double-plug capsule 8 is tightly attached to the hole wall to form a seal, wherein the pressure of the double-plug capsule 8 is 0.2-0.3 MPa higher than the test pressure, and the test process pressure is kept unchanged; carrying out a water pressing test in the hole from top to bottom by using a double-plug section, wherein the double-plug test length L is the distance from the top of the lower plug to the bottom of the upper plug and is generally 3m, and the water pressing test can be actually adjusted according to the water leakage of the rock stratum; water is injected into the test section through the drill rod by using the drilling machine water pump, and a five-point pressurizing method is adopted:
p 1 -p 2 -p 3 -p 4 (＝p 2 )-p 5 (＝p 1 )，
p 1 <p 2 <p 3
p 1 、p 2 、p 3 the tertiary pressures are typically 0.3mpa, 0.6mpa, 1mpa, respectively. And regulating the backwater valve to enable the pressure to be as close to the design pressure of each stage as possible, recording one flow every 3min, recording at least 5 data of each pressure stage, and performing the test of the next stage of pressure when the relative flow difference between the continuous four flows reaching 5 counts is not more than 10% or the absolute difference is not more than 1L/min. Meanwhile, filling a water pressure test record table, calculating the water permeability of the rock mass, and analyzing the water permeability distribution characteristics of the stratum with different depths after being affected by mining.
And (3) calculating the water permeability: the water permeability of the test section adopts the pressure value (P 3 ) And flow value (Q) 3 ) And (3) calculating:
q＝Q 3 /L×P 3
wherein q is the water permeability (Lu) of the test section; q3 is the third stage calculated flow (L/min); l is the test section length (m); p3 is the third stage test section pressure (MPa).
When the water permeability is less than or equal to 0.5Lu, judging that the crack in the test section does not develop, and when the water permeability is more than 0.5Lu, judging that the mining crack of the test section develops. And when the water permeability is obviously changed, the position where the vertex of the water guide crack belt exists is the position where the vertex of the water guide crack belt exists.
In this embodiment, the borehole television observation steps are as follows:
as shown in fig. 5, the observation procedure: and (3) carrying out crack detection on the hole section to be detected at a constant speed from top to bottom by using the drilling television probe 9, and recording the lithology, joint and accurate position and characteristics of the crack in the hole wall in a video recording or photographing mode.
Analysis of the observed results:
and analyzing soil layer observation results, and determining the positions of the cracks, the number of which reaches 3 cracks/m, the inclination angle of which is larger than 50 degrees, accounting for 50% of the total area of the cracks, and the average width of the cracks reaches 25mm as the vertexes of the water guide crack zone.
Analyzing the observation result of the bedrock, and enabling the number of cracks to reach 6 cracks/m; the cracks with the inclination angle larger than 60 degrees account for 50% of the total amount of the regional cracks, and the position where the average width of the cracks reaches 30mm is determined as the vertex of the water guide crack zone.
Fourth step: water-conducting fracture zone comprehensive determination
And determining the development position of the water guiding fracture zone of the thin bedrock of the thick soil layer based on the flushing fluid leakage data and the water permeability data, wherein the rapid change area of the flushing fluid leakage data is regarded as the development position of the water guiding fracture zone, and the area with the water permeability data larger than the preset water permeability is regarded as the development position of the water guiding fracture zone.
Firstly, determining a poor range of the development height of a fracture zone through the leakage quantity of flushing fluid and the change of the water level of a drilling hole, judging the leakage quantity and the rapid change area of the water level as the development position of the vertex of the water guiding fracture zone, and generally judging the development range of the height of the water guiding fracture zone to be about 12m of two footage lengths;
the position with the water permeability greater than 0.5Lu is judged as the development position of the water guide crack zone through the accurate detection of a drilling water pressure test, and the development position can be shortened to 3m generally;
and directly verifying the crack development characteristics in the test section through a drilling television.
According to the comprehensive detection method for the height of the water guide crack zone under the condition of the shallow-buried thick soil layer thin bedrock, provided by the embodiment of the invention, the development position of the water guide crack zone of the thick soil layer thin bedrock can be accurately detected by combining the crack observation of the soil layer observation hole and the bedrock layer observation hole, the accuracy of observing the height of the water guide crack zone by a ground drilling method is improved, the utilization rate of ground drilling is improved, and the method has important significance for preventing and controlling water damage of a top plate.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The comprehensive detection method for the height of the water-guiding fracture zone under the condition of a shallow foundation rock of a shallow buried thick soil layer is characterized by comprising the following steps:
determining the position of a water guide crack zone observation hole;
obtaining an observation hole, wherein the observation hole is provided with a soil layer and a base stratum;
monitoring the leakage amount of the flushing liquid and observing the pressurized water test on the observation pore soil layer, and acquiring the leakage amount data and the water permeability data of the flushing liquid with different depths of the observation pore soil layer;
monitoring the leakage amount of the flushing fluid and observing the pressurized water test on the observation hole base stratum, and acquiring the leakage amount data and the water permeability data of the flushing fluid with different depths of the observation hole base stratum;
and determining the development position of the water-guiding fracture zone of the thin bedrock of the thick soil layer based on the flushing fluid leakage data and the water permeability data of the observation hole stratum, wherein the rapid change area of the flushing fluid leakage data is regarded as the development position of the water-guiding fracture zone, and the area with the water permeability data larger than the preset water permeability is regarded as the development position of the water-guiding fracture zone.
2. The method for the comprehensive detection of the height of the water-conducting fracture zone under the condition of the shallow-buried thick soil layer thin bedrock according to claim 1, wherein the step of determining the development position of the water-conducting fracture zone of the thick soil layer thin bedrock based on the flushing fluid leakage data comprises the following steps:
drawing a curve of the leakage amount of the flushing liquid along with the change of the hole depth, finding out a quick change area of the leakage amount of the flushing liquid, identifying an area with the average leakage amount larger than 0.5L/(s.m) as a micro fracture zone, identifying an area with the average leakage amount larger than 1L/(s.m) as a general fracture zone, and identifying an area with the average leakage amount larger than 1.5L/(s.m) as a serious fracture zone; the micro fracture zone area is considered to be the area where the fracture zone vertex is located.
3. The method for the comprehensive detection of the height of the water-conducting fracture zone under the condition of the shallow-buried thick soil layer thin bedrock according to claim 1, wherein the step of determining the development position of the water-conducting fracture zone of the thick soil layer thin bedrock based on the water permeability data comprises the following steps:
the preset water permeability is set to be 0.5Lu, and the area with the water permeability greater than 0.5Lu is regarded as the development position of the water guide fracture zone.
4. The method for comprehensively detecting the height of the water-guiding fracture zone under the condition of the shallow foundation rock of the shallow buried thick soil layer according to claim 1, further comprising a drilling water level observation step, comprising:
respectively observing the water level of the drilled holes in the drilling process of the observation hole soil layer and the observation hole bedrock layer, and obtaining water level and water level measuring time data corresponding to different depths of the observation holes; and (5) identifying the water level rapid change area as a water guide crack zone development position.
5. The method for comprehensive detection of water-conducting fracture zone height under shallow-buried thick soil layer thin bedrock condition of claim 1, further comprising a borehole television observation step for an observation hole soil layer and an observation hole bedrock layer, comprising:
performing crack detection on the observation hole soil layer and the observation hole base rock stratum from top to bottom by using a drilling television probe to obtain lithology, joint and crack positions and characteristics in the hole wall;
for the observation hole soil layer, determining the area with the average width of the cracks reaching 25mm as the vertex of the water guide crack zone, wherein the number of the cracks reaches 3 pieces/m, the cracks with the inclination angle larger than 50 degrees account for 50% of the total amount of the area cracks;
for the observation hole base rock stratum, determining the area with the average crack width of 30mm as the vertex of the water guide crack zone, wherein the number of cracks reaches 6 pieces/m, the cracks with the inclination angle of more than 60 degrees account for 50% of the total area of the cracks.
6. The method for comprehensively detecting the height of the water-guiding fracture zone under the condition of the shallow-buried thick soil layer and the thin bedrock according to any one of claims 1 to 5, wherein the determining the position of the observation hole of the water-guiding fracture zone comprises the following steps:
2 observation holes of the water guide crack zone after mining are distributed on the ground surface within the range of the working surface to be detected, the distance between two holes and the initial mining line of the stoping working surface is larger than 30m, the distance between the two holes and the final mining line is larger than 15m, one hole is close to the inner side of the return air lane, and the other hole is close to the inner side of the transport lane.
7. The method for the comprehensive detection of the height of the water-conducting fracture zone under the condition of the shallow-buried thick soil layer and the thin bedrock according to any one of claims 1 to 5, which is characterized by further comprising:
and after the observation step is completed on the observation hole soil layer and before the observation hole stratum is drilled, casing pipe setting and pipe fixing sealing are carried out on the soil layer.
8. The method for the comprehensive detection of the height of the water-conducting fracture zone under the condition of the thin bedrock of the shallow buried thick soil layer according to any one of claims 1 to 5, wherein the flushing fluid leakage monitoring step comprises the following steps:
when the flushing fluid forms circulation after drilling, the water level of the primary water source box is measured, the drilling time and the drilling depth are recorded, the measurement and the recording are carried out once every 0.5m, the actual footage is measured after one time is completed, and the actual footage is measured until the flushing fluid is observed to be lost completely without water return.
9. The method for comprehensively detecting the height of the water-conducting fracture zone under the condition of the shallow-buried thick soil layer and the thin bedrock according to any one of claims 1 to 5, wherein the step of observing the pressurized water test comprises the following steps:
placing the double plugs at the positions to be tested in the holes, carrying out a water pressing test in the holes from top to bottom by using the double plugs in a segmented mode, wherein the test length of the double plugs is the distance from the top of the lower plug to the bottom of the upper plug, and injecting water into the test section through a drill rod by using a drilling machine water pump to obtain the pressure value and the flow value of the test section.
10. The method for comprehensively detecting the height of the water-guiding fracture zone under the condition of the shallow foundation rock of the shallow buried thick soil layer, according to claim 9, wherein the water permeability calculation formula is as follows:
q＝Q/L×P
wherein q is the water permeability (Lu) of the test section; q is the flow value (L/min) of the test section; l is the test section length (m); p is the test section pressure (MPa).
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