CN113294143B - Method for evaluating investigation treatment effect of advanced ground area of limestone water damage of coal seam floor - Google Patents
Method for evaluating investigation treatment effect of advanced ground area of limestone water damage of coal seam floor Download PDFInfo
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Abstract
The invention discloses a method for evaluating the investigation treatment effect of a coal seam floor limestone water damage ground advanced area, which comprises the following steps: evaluating drilling tracks in the ground long-distance directional drilling construction process, and scoring each secondary index according to evaluation criteria; according to whether the formation is developed or not, correspondingly selecting an evaluation standard of a normal formation or an abnormal formation, evaluating a drilling exploration result, and scoring each secondary index according to the evaluation standard; evaluating grouting treatment effect, and scoring each secondary index according to evaluation criteria; and according to the scoring results of the 3 sub-items and the evaluation index calculation standard, calculating the sum of the weight values corresponding to the evaluation item indexes to obtain a comprehensive score of the treatment effect, and determining the quality grade of the effect of the exploration treatment project of the advanced ground area of the limestone water damage of the bottom plate according to the comprehensive score and the evaluation grade table. The invention has wide application range and can comprehensively reflect the actual treatment engineering effect.
Description
Technical Field
The invention belongs to the field of evaluation of coal seam floor limestone water damage, and particularly relates to a method for evaluating the investigation treatment effect of a ground advanced area of the coal seam floor limestone water damage.
Background
The limestone aquifer with the coal seam floor has the characteristics of high water pressure, large water quantity, rapid water burst and the like. In order to safely mine the coal seam above the bottom plate limestone aquifer, advanced treatment measures are required. The advanced region treatment of limestone water by using the ground directional drilling technology is an effective measure for guaranteeing the safe exploitation of coal mines. However, currently, a public and reliable evaluation method for exploring and treating the ground advanced area of the limestone water damage of the coal seam floor is lacked, the existing evaluation method is mainly qualitative descriptive evaluation aiming at a certain specific section of a certain specific mine, quantitative evaluation indexes are lacked, subjective factors have great influence, the reliability of evaluation results is poor, the application range is narrow, and the actual treatment effect cannot be comprehensively and truly reflected.
Disclosure of Invention
The invention aims to provide an evaluation method which has wide application range, can comprehensively reflect the actual treatment engineering effect and can quantitatively characterize the advanced region exploration treatment effect of the ground surface of the limestone water disaster of the coal bed bottom plate, so as to solve the problem that the advanced region exploration treatment effect of the ground surface of the limestone water disaster of the coal bed bottom plate lacks an effective evaluation method.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for evaluating the investigation and treatment effects of a coal seam floor limestone water damage ground advanced area comprises the following steps:
(1) Evaluating drilling tracks in the ground long-distance directional drilling construction process, and scoring each secondary index according to evaluation criteria;
(2) According to whether the formation is developed or not, correspondingly selecting an evaluation standard of a normal formation or an abnormal formation, evaluating a drilling exploration result, and scoring each secondary index according to the evaluation standard;
(3) Evaluating grouting treatment effect, and scoring each secondary index according to evaluation criteria;
(4) And according to the scoring results of the 3 sub-items and the evaluation index calculation standard, calculating the sum of the weight values corresponding to the evaluation item indexes to obtain a comprehensive score of the treatment effect, and determining the quality grade of the effect of the exploration treatment project of the advanced ground area of the limestone water damage of the bottom plate according to the comprehensive score and the evaluation grade table.
The invention is further improved in that the evaluation of the drilling track comprises 2 first-level evaluation indexes, namely the plane spacing between the drilling holes and the drilling meeting rate of the target layer.
The invention is further improved in that aiming at the evaluation of the drilling track, the main secondary indexes have 6 indexes, and in the construction process, the actual construction parameters of each index are acquired and analyzed;
(1) branch hole spacing: the distance between branch holes is determined according to actual measurement data of a grouting diffusion radius test of a bottom plate, so that the slurry diffusion range can cover the whole treatment area, the distance between the branch holes is measured, an MWD wireless inclinometry while drilling system is adopted, the space three-dimensional coordinates of drilling tracks of the drill holes are recorded, the recorded space coordinates of the drill holes are projected onto an actual coordinate network of the treatment area, and the distance between the branch drill holes is measured in the figure;
(2) track while drilling monitoring point spacing: the interval index of the drilling track monitoring points is used for indicating the control precision of the drilling track, namely three-dimensional coordinate data is taken for the drilling track every certain interval, the interval of the drilling track monitoring points adopts an MWD wireless inclinometry while drilling system, the three-dimensional coordinate of the record space of the drilling track is recorded, then the recorded space coordinate of the drilling track is projected onto the actual coordinate network of the treatment area, and the interval of the monitoring points is measured in the figure;
(3) deviation of horizontal projection and design track in treatment area: recording the space three-dimensional coordinates of the drilling track of the drill hole by adopting an MWD wireless inclinometry while drilling system for deviation between the actual track of the drill hole and the designed route, then projecting the recorded space coordinates of the drill hole onto the actual coordinate network of the treatment area, projecting the designed drill hole track onto the actual coordinate network, measuring a deviation value along the drill hole track, adding the lengths of the drill hole tracks with the deviation of the drill hole track being larger than a standard value, and then comparing the calculated length with the projected length of the horizontal section of the drill hole, wherein the ratio is larger than 75 percent, namely the drill hole is unqualified;
(4) construction final hole point coordinates and design target point position deviation: the construction final hole point refers to three-dimensional coordinates of the final hole position of each branch drilling hole, an MWD wireless inclinometry while drilling system is adopted, the spatial three-dimensional coordinates of the final hole position of the drilling hole are recorded, then the three-dimensional coordinates are compared with the final hole position of the designed drilling hole, and the distance between the final hole position of the designed drilling hole and the position of the designed target point is calculated by utilizing the three-dimensional coordinates;
(5) gamma value while drilling: judging the drilling horizon by utilizing the difference of the drilling target horizon and the drilling gamma values of other horizons, wherein the MWD wireless drilling inclinometry system can directly read and record the drilling gamma values, and the drilling gamma values are exported by the system after drilling construction is completed;
(6) actual drilling rate of target horizon: and determining the length of the target horizon section in the horizontal branch drilling track by combining the rock debris logging data, the while-drilling gamma value and the logging data during drilling, and then calculating the ratio of the target horizon section to the total length of the branch drilling track to obtain the actual drilling meeting rate of the target horizon.
The invention is further improved in that for evaluation of the exploration result, firstly, whether the target interval is a normal stratum is distinguished, and then, corresponding evaluation indexes are selected according to whether the target interval is the normal stratum;
the evaluation index for normal stratum has 4 items:
(1) logging rate of change while drilling: calculating the logging change rate during drilling according to the logging curve during drilling; when drilling is performed, recording logging while drilling data by using a logging while drilling instrument, then deriving a logging while drilling curve, determining standard logging while drilling data of a target layer according to the logging while drilling data while drilling in the target layer, counting drilling distances deviating from a standard logging while drilling value, and calculating a ratio of a drilling section deviating from the standard logging while drilling value to the total length of a branch hole, namely, a logging while drilling change rate;
(2) drilling fluid consumption: drilling fluid consumption refers to the leakage of mud during drilling; the drilling fluid leakage is calculated through the statistics of the reduction amount of the mud in the mud pit, and the ratio of the reduction amount of the mud to the time in the statistical period is calculated, namely the drilling fluid consumption;
(3) water permeability in pressurized water test: according to the elevation of the position of the target layer, calculating the water pressure of water injected into the position of the target layer, selecting a water pressure test section, measuring the length of the test section, then enabling the water pressure from the ground to enter a drilling test section, recording the water quantity injected into the test section in unit time, and calculating the water permeability of the water pressure test at the position according to a permeability formula;
(4) hole separation/sectional grouting single-meter grouting amount: counting the cement slurry injection quantity of a branch drilling hole or a certain section, and comparing the quantity of injected cement slurry with the length of the branch drilling hole section or the length of a certain injection section, wherein the obtained data is the single-meter grouting quantity of the branch drilling hole/sectional grouting;
the evaluation index for normal stratum has 5 items:
(1) drilling anomalies: drilling abnormality refers to an abnormal condition occurring during drilling of a borehole; the drilling abnormality comprises drill dropping, drilling clamping and drilling, the drilling abnormality is judged by on-site constructors, records are made in time, the coordinate position of a drilling abnormal section is determined by combining an MWD wireless inclinometry while drilling system, and the index of the drilling abnormality in the drilling process is judged to be unqualified;
(2) drilling fluid consumption: the parameter acquisition method is the same as that of a normal stratum;
(3) average temperature difference of drilling mud inlet and outlet: monitoring the slurry temperature of the branch drilling holes by using an electronic thermometer, drawing a temperature change curve by taking the advancing direction of the horizontal projection direction of the branch drilling holes as a horizontal axis and taking temperature observation data as a vertical axis, and determining that the average temperature difference is more than 3 ℃ and is unqualified;
(4) and (3) observing the water level in the hole: the water level is measured by a wire electric sounding method or by a sounding rope and a buoy, and is unqualified when the water level is suddenly not measured or abnormally increased;
(5) water permeability in pressurized water test: the parameter acquisition method is the same as that of the normal stratum.
The invention is further improved in that for evaluation in the exploration process, normal stratum and abnormal stratum are distinguished first, and then corresponding evaluation indexes are selected.
The invention is further improved in that the method is divided into a single-hole grouting end standard and a grouting verification result evaluation 2 primary indexes aiming at the evaluation of grouting treatment effect.
The invention is further improved in that for the evaluation of grouting treatment results, the main secondary indexes have 4 items, and in the construction process, the actual construction parameters of each index are acquired and analyzed;
(1) single hole grouting pressure and flow stabilizing time: observing grouting pressure through a grouting pump pressure meter, observing grouting flow through a flowmeter, observing and recording the stabilization time through a stopwatch or a watch timing tool, comparing the observed grouting pressure, flow and stabilization time with a standard, stabilizing the pressure and the stabilization time for more than 30min to be qualified, otherwise, not to be qualified, stabilizing the pressure to be more than 1.5 times of the static pressure of the Oak water, and stabilizing the flow to be less than 35L/min;
(2) comparison of adjacent branch drilling fluid consumption: the method comprises the steps that a main probing hole is provided with a plurality of branch drilling holes, drilling fluid in each branch drilling hole drilling process is counted, drilling fluid consumption of each branch drilling hole in unit length is calculated, then the drilling fluid consumption is compared with adjacent drilling holes, and the difference of the drilling fluid consumption of the adjacent branch drilling holes is larger than 20%, namely the drilling fluid consumption of the adjacent branch drilling holes is unqualified;
(3) water permeability of pressurized water after grouting: the observation method of the water permeability of the pressurized water is the same as the detection method of the water permeability index of the pressurized water test in the exploration and evaluation, the water permeability of the pressurized water after grouting is less than or equal to 0.01lu, and the pressurized water permeability is qualified, otherwise, the pressurized water permeability is unqualified;
(4) and (3) comparing and verifying grouting quantity of adjacent branch holes: and the main probing hole is provided with a plurality of branch drilling holes, the cement slurry consumption of each branch drilling hole grouting treatment process is counted, the cement slurry consumption of the branch drilling hole in unit length is calculated, then the cement slurry consumption is compared with the adjacent drilling holes, and the difference of the adjacent branch drilling liquid consumption is more than 20%, namely the cement slurry consumption is unqualified.
The invention is further improved in that the evaluation grade classification method comprises the following steps:
(1) comparing and judging item by referring to the listed standards, and obtaining the weight score corresponding to the index when the qualified standard is reached;
(2) for the evaluation items which do not have the monitoring conditions or other reasons and do not acquire the evaluation indexes of the related data, the evaluation range is not included, and the corresponding weight scores are not counted into the total weight scores;
(3) and adding the evaluated index weight scores to obtain a total weight score, and dividing the sum of the qualified item scores by the total weight score to obtain corresponding percentage data W.
The invention is further improved in that the percentage data w=the sum of scores of the evaluation index items/the sum of scores of the evaluation weights is 100%.
Compared with the prior art, the invention has at least the following beneficial technical effects:
(A) Aiming at the treatment and evaluation of the limestone water damage of the bottom plate, the effect of grouting treatment is judged according to the actual production disclosure data and the observation of the water inflow of the mine in the past, and the hysteresis of the evaluation method is obvious, and the final treatment effect can be determined usually in a few months to a few years. The invention can evaluate the evaluation standard in the treatment process, has obvious timeliness and is beneficial to shortening the engineering quality evaluation period.
(B) The grouting effect evaluation is carried out in the treatment process of the ground grouting treatment engineering of the limestone water damage of part of the bottom plate, but the qualitative evaluation is most, the quantitative indexes are few, and the evaluation is more aimed at single engineering measures, and the system is not formed. The invention provides an evaluation system for verifying the whole treatment process from drilling construction to grouting, which is mainly quantitative evaluation indexes, and the evaluation result is easy to quantify.
(C) And grading the evaluation result of the ground grouting treatment effect of the limestone water damage of the bottom plate, and taking the evaluation result as the basis of project quality assessment.
Drawings
FIG. 1 is a schematic flow chart of an implementation of the present invention.
FIG. 2 is a schematic diagram of an evaluation index system according to the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in FIG. 1, the method for evaluating the investigation treatment effect of the coal seam floor limestone water damage ground advanced area provided by the invention comprises the following steps:
(1) The method is aimed at a drilling track evaluation project and comprises 2 first-level evaluation indexes, namely the plane spacing between drilling holes and the drilling meeting rate of a target layer. The 2 primary indexes are subdivided into 6 secondary indexes.
(1) In the evaluation of the drilling plane spacing, the drilling spacing of each branch, the track while drilling monitoring point spacing, the deviation between horizontal projection and design track in a treatment area and the deviation distance between the coordinates of a construction final hole point and the position of a design target point are respectively observed and recorded.
(2) And respectively comparing the observed drilling space of each branch, the distance between monitoring points of the track while drilling, the deviation between horizontal projection and design track in the treatment area, the deviation distance parameter between the coordinates of the construction final hole point and the position of the design target point with the evaluation standard formulated in the attached table 1, and judging whether the test is qualified. And obtaining a corresponding weight score after being qualified, and obtaining a score of 0 after the evaluation index is unqualified.
(3) In the evaluation of the drilling meeting rate of the target layer, the while-drilling gamma value in the drilling process is recorded, whether the actually measured while-drilling gamma value is within a qualified standard (different while-drilling gamma values of different target layers are different, the standard needs to actually measure the while-drilling gamma value range of the target layer in a specific construction site), the qualification is 5 points, and the disqualification is 0 points.
(4) And (3) calculating the ratio of the distance of the drilling hole in the target stratum and the total drilling length of the drilling hole in the horizontal direction in the drilling process, namely, the actual drilling meeting rate of the target stratum, wherein when the drilling is performed in the stratum with the structural development, the actual drilling meeting rate of the target stratum is more than or equal to 85 percent and is qualified, the drilling is performed in the stratum without the structural development, and the actual drilling meeting rate of the target stratum reaches 100 percent and is qualified, namely, the drilling track in the normal stratum must always be positioned in the target stratum. And 5 points are obtained after the product is qualified, and 0 points are obtained after the product is unqualified.
(2) For evaluation in the exploration process, normal stratum and abnormal stratum need to be distinguished, and then corresponding evaluation indexes are selected.
(1) The method drills in a normal stratum, and the indexes to be evaluated are the logging change rate during drilling, the drilling fluid consumption, the water permeability of a pressurized water test and the grouting quantity of single meter grouting in a split hole (section) mode. And (4) counting the indexes in time in the drilling process, comparing the indexes with a standard, obtaining a corresponding weight score if the indexes are qualified, and obtaining a score of 0 if the indexes are unqualified.
(2) The stratum with structural development such as faults, collapse columns and the like is an abnormal stratum, and 5 evaluation indexes are provided in the evaluation of the exploration effect of the abnormal stratum. The method is characterized by respectively drilling abnormality, drilling fluid consumption, average temperature difference of a drilling mud inlet and a drilling mud outlet, observation of water level in a hole and water permeability of a pressurized water test. Wherein, two evaluation indexes of abnormal drilling and water level observation in the hole are qualitative indexes, and the on-site technician is required to judge according to the drilling condition. The abnormal drilling is mainly represented by the phenomena of drill falling, drill sticking and the like, and the abnormal water level observation in the hole is represented by the sudden rise or the sudden drop of the water level, so that the water level data cannot be monitored. The other 4 indexes are quantitative indexes, and are compared with the evaluation standards formulated in table 1 to judge whether the test is qualified. And obtaining a corresponding weight score after being qualified, and obtaining a score of 0 after the evaluation index is unqualified.
(3) For evaluation of the exploration effect, only the corresponding evaluation indexes of the normal stratum and the abnormal stratum are selected. If the normal stratum is the normal stratum, the evaluation is carried out according to the evaluation index of the normal stratum, the evaluation index of the abnormal stratum is not counted into an evaluation system, and the corresponding weight score is not counted into the total weight score. And vice versa.
(3) The method is mainly divided into two primary indexes of a single-hole grouting end standard and a grouting verification result evaluation aiming at the evaluation of grouting treatment effect. The method is subdivided into 4 secondary evaluation indexes.
(1) Aiming at the standard requirement of single-hole grouting end, when drilling grouting is finished, stable flow (less than 35L/min) is required to be carried out for more than 30min at the stable pressure (more than 1.5 times of the Oak hydrostatic pressure); otherwise, the test result is disqualified. And if the product is qualified, the product is 10 points, and if the product is not qualified, the product is 0 points.
(2) Grouting verification mainly comprises 3 secondary evaluation indexes. And respectively comparing and verifying the consumption of the drilling fluid of the adjacent branch, the water permeability of the pressurized water after grouting and the grouting quantity of the adjacent branch hole. And comparing with the evaluation standard established in the table 1 to judge whether the test is qualified. And obtaining a corresponding weight score after being qualified, and obtaining a score of 0 after the evaluation index is unqualified.
(4) Evaluation effect grading rule
(1) And (5) comparing and judging item by item according to the listed standards, and obtaining the weight score corresponding to the index when the qualified standard is reached.
(2) If the evaluation item does not have the monitoring condition or the evaluation index for other reasons, which does not acquire the related data, the evaluation range is not included, and the corresponding weight score does not count into the total weight score.
(3) And adding the evaluated index weight scores to obtain a total weight score, and dividing the sum of the qualified item scores by the total weight score to obtain corresponding percentage data W.
W=sum of scores of each evaluation index item/sum of scores of evaluation weights:. 100%
(5) And (5) evaluating the water damage grouting treatment effect of the ground long-distance directional drilling floor limestone.
And comparing the obtained percentage data W with an evaluation grade standard (table 2) to obtain the overall effect of the ground long-distance directional drilling floor limestone water damage treatment. W is less than 75%, and is unqualified; w is 75 percent or more and is less than 90 percent, and is qualified; w is more than or equal to 90% and less than or equal to 100%, which is good.
Table 1 evaluation standard for ground long distance directional drilling floor limestone water damage grouting treatment effect
Table 2 evaluation level of treatment effect
| Percentage of | W<70％ | 70％≤W<85％ | 85％≤W≤100％ |
| Treatment effect grade | Failure to pass | Qualified product | Good quality |
Claims (4)
1. The method for evaluating the investigation treatment effect of the advanced ground area of the limestone water damage of the coal seam floor is characterized by comprising the following steps:
(1) Evaluating drilling tracks in the ground long-distance directional drilling construction process, and scoring each secondary index according to evaluation criteria; the evaluation of the drilling track comprises 2 first-level evaluation indexes, namely the plane spacing between the drilling holes and the drilling meeting rate of the target layer;
aiming at the evaluation of the drilling track, 6 main secondary indexes are provided, and in the construction process, the actual construction parameters of each index are acquired and analyzed;
(1) branch hole spacing: the distance between branch holes is determined according to actual measurement data of a grouting diffusion radius test of a bottom plate, so that the slurry diffusion range can cover the whole treatment area, the distance between the branch holes is measured, an MWD wireless inclinometry while drilling system is adopted, the space three-dimensional coordinates of drilling tracks of the drill holes are recorded, the recorded space coordinates of the drill holes are projected onto an actual coordinate network of the treatment area, and the distance between the branch drill holes is measured in the figure;
(2) track while drilling monitoring point spacing: the interval index of the drilling track monitoring points is used for indicating the control precision of the drilling track, namely three-dimensional coordinate data is taken for the drilling track every certain interval, the interval of the drilling track monitoring points adopts an MWD wireless inclinometry while drilling system, the three-dimensional coordinate of the record space of the drilling track is recorded, then the recorded space coordinate of the drilling track is projected onto the actual coordinate network of the treatment area, and the interval of the monitoring points is measured in the figure;
(3) deviation of horizontal projection and design track in treatment area: recording the space three-dimensional coordinates of the drilling track of the drill hole by adopting an MWD wireless inclinometry while drilling system for deviation between the actual track of the drill hole and the designed route, then projecting the recorded space coordinates of the drill hole onto the actual coordinate network of the treatment area, projecting the designed drill hole track onto the actual coordinate network, measuring a deviation value along the drill hole track, adding the lengths of the drill hole tracks with the deviation of the drill hole track being larger than a standard value, and then comparing the calculated length with the projected length of the horizontal section of the drill hole, wherein the ratio is larger than 75 percent, namely the drill hole is unqualified;
(4) construction final hole point coordinates and design target point position deviation: the construction final hole point refers to three-dimensional coordinates of the final hole position of each branch drilling hole, an MWD wireless inclinometry while drilling system is adopted, the spatial three-dimensional coordinates of the final hole position of the drilling hole are recorded, then the three-dimensional coordinates are compared with the final hole position of the designed drilling hole, and the distance between the final hole position of the designed drilling hole and the position of the designed target point is calculated by utilizing the three-dimensional coordinates;
(5) gamma value while drilling: judging the drilling horizon by utilizing the difference of the drilling target horizon and the drilling gamma values of other horizons, wherein the MWD wireless drilling inclinometry system can directly read and record the drilling gamma values, and the drilling gamma values are exported by the system after drilling construction is completed;
(6) actual drilling rate of target horizon: determining the length of the target horizon section in the horizontal branch drilling track by combining the rock debris logging data, the while-drilling gamma value and the logging data during drilling, and then calculating the ratio of the target horizon section to the total length of the branch drilling track to obtain the actual drilling meeting rate of the target horizon;
(2) According to whether the formation is developed or not, correspondingly selecting an evaluation standard of a normal formation or an abnormal formation, evaluating a drilling exploration result, and scoring each secondary index according to the evaluation standard; for evaluation of the exploration result, firstly distinguishing whether the target interval is a normal stratum or not, and then selecting a corresponding evaluation index according to whether the target interval is the normal stratum or not;
the evaluation index for normal stratum has 4 items:
(1) logging rate of change while drilling: calculating the logging change rate during drilling according to the logging curve during drilling; when drilling is performed, recording logging while drilling data by using a logging while drilling instrument, then deriving a logging while drilling curve, determining standard logging while drilling data of a target layer according to the logging while drilling data while drilling in the target layer, counting drilling distances deviating from a standard logging while drilling value, and calculating a ratio of a drilling section deviating from the standard logging while drilling value to the total length of a branch hole, namely, a logging while drilling change rate;
(2) drilling fluid consumption: drilling fluid consumption refers to the leakage of mud during drilling; the drilling fluid leakage is calculated through the statistics of the reduction amount of the mud in the mud pit, and the ratio of the reduction amount of the mud to the time in the statistical period is calculated, namely the drilling fluid consumption;
(3) water permeability in pressurized water test: according to the elevation of the position of the target layer, calculating the water pressure of water injected into the position of the target layer, selecting a water pressure test section, measuring the length of the test section, then enabling the water pressure from the ground to enter a drilling test section, recording the water quantity injected into the test section in unit time, and calculating the water permeability of the water pressure test at the position according to a permeability formula;
(4) hole separation/sectional grouting single-meter grouting amount: counting the cement slurry injection quantity of a branch drilling hole or a certain section, and comparing the quantity of injected cement slurry with the length of the branch drilling hole section or the length of a certain injection section, wherein the obtained data is the single-meter grouting quantity of the branch drilling hole/sectional grouting;
there are 5 evaluation indexes for abnormal stratum:
(1) drilling anomalies: drilling abnormality refers to an abnormal condition occurring during drilling of a borehole; the drilling abnormality comprises drill dropping, drilling clamping and drilling, the drilling abnormality is judged by on-site constructors, records are made in time, the coordinate position of a drilling abnormal section is determined by combining an MWD wireless inclinometry while drilling system, and the index of the drilling abnormality in the drilling process is judged to be unqualified;
(2) drilling fluid consumption: the parameter acquisition method is the same as that of a normal stratum;
(3) average temperature difference of drilling mud inlet and outlet: monitoring the slurry temperature of the branch drilling holes by using an electronic thermometer, drawing a temperature change curve by taking the advancing direction of the horizontal projection direction of the branch drilling holes as a horizontal axis and taking temperature observation data as a vertical axis, and determining that the average temperature difference is more than 3 ℃ and is unqualified;
(4) and (3) observing the water level in the hole: the water level is measured by a wire electric sounding method or by a sounding rope and a buoy, and is unqualified when the water level is suddenly not measured or abnormally increased;
(5) water permeability in pressurized water test: the parameter acquisition method is the same as that of a normal stratum;
(3) Evaluating grouting treatment effect, and scoring each secondary index according to evaluation criteria; aiming at the evaluation of grouting treatment effect, the method is divided into a single-hole grouting end standard and 2 primary indexes of grouting verification result evaluation; for evaluation of grouting treatment results, the main secondary indexes are 4, and in the construction process, the actual construction parameters of each index are collected and analyzed;
(1) single hole grouting pressure and flow stabilizing time: observing grouting pressure through a grouting pump pressure meter, observing grouting flow through a flowmeter, observing and recording the stabilization time through a stopwatch or a watch timing tool, comparing the observed grouting pressure, flow and stabilization time with a standard, stabilizing the pressure and the stabilization time for more than 30min to be qualified, otherwise, not to be qualified, stabilizing the pressure to be more than 1.5 times of the static pressure of the Oak water, and stabilizing the flow to be less than 35L/min;
(2) comparison of adjacent branch drilling fluid consumption: the method comprises the steps that a main probing hole is provided with a plurality of branch drilling holes, drilling fluid in each branch drilling hole drilling process is counted, drilling fluid consumption of each branch drilling hole in unit length is calculated, then the drilling fluid consumption is compared with adjacent drilling holes, and the difference of the drilling fluid consumption of the adjacent branch drilling holes is larger than 20%, namely the drilling fluid consumption of the adjacent branch drilling holes is unqualified;
(3) water permeability of pressurized water after grouting: the observation method of the water permeability of the pressurized water is the same as the detection method of the water permeability index of the pressurized water test in the exploration and evaluation, the water permeability of the pressurized water after grouting is less than or equal to 0.01lu, and the pressurized water permeability is qualified, otherwise, the pressurized water permeability is unqualified;
(4) and (3) comparing and verifying grouting quantity of adjacent branch holes: the main probing hole is provided with a plurality of branch drilling holes, the cement slurry consumption of each branch drilling hole grouting treatment process is counted, the cement slurry consumption of the branch drilling hole in unit length is calculated, then the cement slurry consumption is compared with the adjacent drilling holes, and the difference of the adjacent branch drilling liquid consumption is more than 20%, namely the cement slurry consumption is unqualified;
(4) And according to the scoring results of the 3 sub-items and the evaluation index calculation standard, calculating the sum of the weight values corresponding to the evaluation item indexes to obtain a comprehensive score of the treatment effect, and determining the quality grade of the effect of the exploration treatment project of the advanced ground area of the limestone water damage of the bottom plate according to the comprehensive score and the evaluation grade table.
2. The method for evaluating the investigation treatment effect of the coal seam floor limestone water damage ground advanced area according to claim 1, wherein for the evaluation of the investigation process, normal stratum and abnormal stratum are distinguished first, and then corresponding evaluation indexes are selected.
3. The evaluation method for the advanced ground surface exploration treatment effect of the limestone water disaster on the coal seam floor according to claim 1, wherein the evaluation grading method is as follows:
(1) comparing and judging item by referring to the listed standards, and obtaining the weight score corresponding to the index when the qualified standard is reached;
(2) for the evaluation items which do not have the monitoring conditions or other reasons and do not acquire the evaluation indexes of the related data, the evaluation range is not included, and the corresponding weight scores are not counted into the total weight scores;
(3) and adding the evaluated index weight scores to obtain a total weight score, and dividing the sum of the qualified item scores by the total weight score to obtain corresponding percentage data W.
4. A method for evaluating the effect of exploring and controlling a ground lead area of a limestone water disaster on a coal seam floor according to claim 3, wherein the percentage data w=the sum of scores of all evaluation index items/the sum of scores of evaluation weights is 100%.
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