阅读说明：本技术 一种煤矿井下水平钻孔中直流电超前透视探测装置及方法 (Direct current advanced perspective detection device and method in coal mine underground horizontal drilling ) 是由 刘磊 范涛 张鹏 李博凡 安又新 赵睿 房哲 于 2020-07-17 设计创作，主要内容包括：本发明公开一种煤矿井下水平钻孔中直流电超前透视探测装置及方法,探测装置包括孔中多芯电缆和充气气囊；该方法包括：孔中多芯电缆推送入孔前处理；通过充气管道向充气气囊内充气,充气气囊膨胀挤压孔中电极,以使孔中电极能紧贴钻孔内壁,完成孔中多芯电缆在水平钻孔中的布设；对孔中电极供电并接收数据；进行数据归类与处理；提取两个钻孔对应的四条参考线上的电阻率数值对应作出四条曲线,比较相同的横向位置电阻率值,以异常幅度作为判断标准,得到异常体实际位置。本发明透视探测方法大大提高了巷道掘进轴线旁侧20m范围内的安全保障。(The invention discloses a direct current advanced perspective detection device and a direct current advanced perspective detection method in a horizontal borehole under a coal mine, wherein the detection device comprises a multi-core cable and an inflatable air bag in a hole; the method comprises the following steps: pre-treating the multi-core cable in the hole by pushing the multi-core cable into the hole; inflating the inflatable air bag through an inflation pipeline, and expanding the inflatable air bag to extrude the electrodes in the holes so that the electrodes in the holes can be tightly attached to the inner wall of the drilled hole to complete the arrangement of the multi-core cable in the horizontal drilled hole; supplying power to the electrodes in the holes and receiving data; classifying and processing data; and extracting resistivity values on four reference lines corresponding to the two drill holes to correspondingly make four curves, comparing the same transverse position resistivity values, and obtaining the actual position of the abnormal body by taking the abnormal amplitude as a judgment standard. The perspective detection method greatly improves the safety guarantee within the range of 20m beside the roadway excavation axis.)

1. A direct current advanced perspective detection device in a horizontal borehole under a coal mine is characterized by comprising a multi-core cable (1) and an inflatable air bag (2) in the borehole;

the in-hole multi-core cable (1) comprises a multi-core cable (11) and an in-hole electrode (12); a cable inner core (111) is arranged on the multi-core cable (11) at the position of 4-5m at intervals and is in a drawing-out state, a tap of each cable inner core (111) is provided with the in-hole electrode (12), and each cable inner core (111) in the multi-core cable (11) is correspondingly provided with the in-hole electrode (12) to obtain the in-hole multi-core cable (1); the in-hole electrode (12) comprises a flat columnar copper electrode (121) poured at a tap of the cable inner core (111) and a water-absorbing resin layer (122) wrapped outside the copper electrode (121);

the number of the inflatable air bags (2) is multiple, the adjacent inflatable air bags (2) are communicated through an inflatable pipeline, the number of the inflatable air bags (2) is consistent with that of the electrodes (12) in the holes, and the inflatable air bags (2) are opposite to the electrodes (12) in the holes one by one; after the inflatable air bag (2) is inflated, the corresponding electrode (12) in the hole can be extruded to the inner wall (4) of the drilled hole tightly attached to the drilled hole (3).

2. The direct current advanced perspective detection device in the horizontal borehole of the coal mine well as the claim 1 is characterized in that the bore diameter of the borehole (3) is 50mm-73 mm; the electrode (12) in the hole is of a flat column structure, the long axis of the electrode is 30mm, the short axis of the electrode is 16mm, the length of the electrode is 15cm, and the thickness of the water-absorbent resin layer (122) is 2-3 mm.

3. A direct current advanced perspective detection method in a horizontal borehole in a coal mine, which is characterized in that the method adopts the detection device of claim 1 to detect, and comprises the following steps:

step one, pre-treating a multi-core cable pushed into a hole: placing the electrodes in the holes in high-concentration salt water to be soaked for 3-5 minutes so that the water-absorbent resin layer is filled with enough electrolyte solution;

step two, laying a multi-core cable and an inflatable air bag in the hole: respectively pushing the multi-core cables in the two holes to specified positions in two horizontal drilling holes with an angle, uniformly distributing inflatable air bags which are mutually communicated through an inflatable pipeline in the two drilling holes, inflating the inflatable air bags through the inflatable pipeline, and expanding the inflatable air bags to extrude electrodes in the holes so that the electrodes in the holes can be tightly attached to the inner walls of the drilling holes;

step three, supplying power to the electrodes in the holes and receiving data: numbering the two drill holes as a 1# drill hole and a 2# drill hole respectively;

step 3.1, successively supplying power to the electrode in each hole in the 1# drilling hole to enable the electrode to serve as a power supply electrode, and meanwhile, receiving potential difference data by taking the electrodes in all the rest other holes as receiving electrodes every time; completing a power supply process until electrodes in all holes in the No. 1 drill hole are all completed; at the moment, the potential difference data received by all receiving electrodes in the 1# drilling hole is 1# drilling hole single-hole depth measurement data; potential difference data received by all receiving electrodes in the No. 2 drill hole are perspective data among the holes;

step 3.2, sequentially supplying power to the electrode in each hole in the 2# drilling hole to enable the electrode to serve as a power supply electrode, and meanwhile, receiving potential difference data by taking the electrodes in all the rest other holes as receiving electrodes every time; until the electrodes in all holes in the 2# drilling hole finish a power supply process; at the moment, the potential difference data received by all receiving electrodes in the 2# drilling hole is 2# drilling hole single-hole sounding data; potential difference data received by all receiving electrodes in the No. 1 drill hole are perspective data among holes;

step four, data classification and processing: respectively processing the 1# drilling hole single-hole sounding data, the 2# drilling hole single-hole sounding data and the inter-hole perspective data obtained in the fourth step to respectively obtain an abnormal resistivity map in the 1# drilling hole radial range, an abnormal resistivity map in the 2# drilling hole radial range and an inter-hole perspective abnormal map;

step five, determining the actual position of the abnormal body:

step 5.1, determining the drilling depth of the abnormal body on the comprehensive result graph of the three graphs obtained in the step five;

step 5.2, predicting the radial distance M of the lowest value of the abnormal body in the drilling depth;

step 5.3, two reference lines which are parallel to the 1# drilling hole and have the distance M with the 1# drilling hole are made on two sides of the 1# drilling hole: 1 line on the left side and 2 lines on the right side of the 1# borehole; two reference lines which are parallel to the 2# drilling hole and are at a distance M from the 2# drilling hole are made on two sides of the 2# drilling hole: 3 lines on the left side and 4 lines on the right side of the No. 2 drill hole; forming four reference lines in total;

and 5.4, extracting resistivity values on the four reference lines, correspondingly making four curves, comparing the same lateral position resistivity values, and obtaining the actual position of the abnormal body by taking the abnormal amplitude as a judgment standard.

4. The direct current advanced perspective detection method for horizontal boreholes in a coal mine well as defined in claim 3, wherein the two horizontal boreholes form an included angle of 60 degrees and the depth of the two horizontal boreholes is 100-120 m.

5. The method for DC advanced perspective detection in a horizontal borehole in a coal mine well according to claim 3, wherein in the 1# borehole and the 2# borehole, the 1# borehole is located on the left side of the roadway axis, and the 2# borehole is located on the right side of the roadway axis.

6. The method for detecting direct current advanced perspective in horizontal drilling holes under coal mines as claimed in claim 5, wherein in step 5.4, four curves are correspondingly made by extracting resistivity values on four reference lines, the same lateral position resistivity values are compared, the abnormal amplitudes are taken as a judgment standard, and the abnormal amplitudes of the four curves corresponding to the 1 line, the 2 line, the 3 line and the 4 line are respectively (i), (ii), (iii) and (iv):

(1) if the first step is greater than the second step, the abnormal body is positioned on the left side of the 1# drilled hole and is matched with the 1# drilled hole single-hole depth measuring position;

(2) if the first step is less than the second step and the third step is less than the fourth step, the abnormal body is positioned on the right side of the 2# drilling hole and is matched with the 2# drilling hole single-hole depth measuring position;

(3) if the first and second drilling holes are equal to each other and larger than the third and fourth drilling holes, the abnormal body is positioned between the 1# drilling hole and the 2# drilling hole and is deviated to the left of the roadway axis; the perspective result is reliable;

(4) if the third and fourth are equal and larger than the first and second, the abnormal body is positioned between the 1# drilling hole and the 2# drilling hole and is inclined to the right of the roadway axis; the perspective result is reliable.

Technical Field

The invention belongs to the technical field of geophysical exploration, and relates to a direct current advanced perspective detection device and method in a horizontal borehole in a coal mine.

Background

In the process of coal mine tunnel/tunnel excavation, the exploration of an unknown disaster in front of the excavation head-on is always a relatively difficult engineering problem. The current general method is to carry out geophysical prospecting work behind the tunnel face, and the biggest problem of the current method is that: construction detection is performed behind the tunnel face, due to the problem of observation angle or the problem of instrument power, excitation signals are difficult to cover a large area in front of the head, and abnormal body signals received by instrument equipment are very weak and almost submerged in background noise.

With the improvement of the mechanized coal mining degree, rapid tunneling and accurate detection become urgent requirements of coal mine production, and a coal mine roadway/tunnel advanced detection method which is relatively rapid in construction and reliable in detection result is urgently needed.

Disclosure of Invention

Aiming at the defects and shortcomings in the prior art, the invention provides a direct current advanced perspective detection device and method in a horizontal drilling hole under a coal mine, and aims to solve the problems in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

a direct current advanced perspective detection device in a horizontal drilling hole under a coal mine comprises a multi-core cable and an inflatable air bag in the hole;

the in-hole multi-core cable comprises a multi-core cable and an in-hole electrode; a cable inner core is in a drawing-out state at the position of 4-5m away from the multi-core cable, the tapping position of each cable inner core is provided with the in-hole electrode, and each cable inner core in the multi-core cable is correspondingly provided with one in-hole electrode to obtain the in-hole multi-core cable; the electrodes in the holes comprise flat-column-shaped copper electrodes poured at taps of the cable inner core and water-absorbing resin layers wrapped outside the copper electrodes;

the number of the inflatable air bags is multiple, the adjacent inflatable air bags are communicated through an inflatable pipeline, the number of the inflatable air bags is consistent with that of the electrodes in the holes, and the inflatable air bags are opposite to the electrodes in the holes one by one; after the inflatable air bag is inflated, the corresponding electrodes in the holes can be extruded to the inner wall of the drilled hole, which is tightly attached to the drilled hole.

The invention also comprises the following technical characteristics:

specifically, the aperture of the drilling hole is 50mm-73 mm; the electrodes in the holes are of a flat columnar structure, the long axis of the electrodes is 30mm, the short axis of the electrodes is 16mm, the length of the electrodes is 15cm, and the thickness of the water-absorbent resin layer is 2-3 mm.

The invention also provides a direct current advanced perspective detection method in the underground horizontal drilling of the coal mine, which adopts the detection device for detection and comprises the following steps:

step one, pre-treating a multi-core cable pushed into a hole: placing the electrodes in the holes in high-concentration salt water to be soaked for 3-5 minutes so that the water-absorbent resin layer is filled with enough electrolyte solution;

step two, laying a multi-core cable and an inflatable air bag in the hole: respectively pushing the multi-core cables in the two holes to specified positions in two horizontal drilling holes with an angle, uniformly distributing inflatable air bags which are mutually communicated through an inflatable pipeline in the two drilling holes, inflating the inflatable air bags through the inflatable pipeline, and expanding the inflatable air bags to extrude electrodes in the holes so that the electrodes in the holes can be tightly attached to the inner walls of the drilling holes;

step three, supplying power to the electrodes in the holes and receiving data: numbering the two drill holes as a 1# drill hole and a 2# drill hole respectively;

step 3.1, successively supplying power to the electrode in each hole in the 1# drilling hole to enable the electrode to serve as a power supply electrode, and meanwhile, receiving potential difference data by taking the electrodes in all the rest other holes as receiving electrodes every time; completing a power supply process until electrodes in all holes in the No. 1 drill hole are all completed; at the moment, the potential difference data received by all receiving electrodes in the 1# drilling hole is 1# drilling hole single-hole depth measurement data; potential difference data received by all receiving electrodes in the No. 2 drill hole are perspective data among the holes;

step 3.2, sequentially supplying power to the electrode in each hole in the 2# drilling hole to enable the electrode to serve as a power supply electrode, and meanwhile, receiving potential difference data by taking the electrodes in all the rest other holes as receiving electrodes every time; until the electrodes in all holes in the 2# drilling hole finish a power supply process; at the moment, the potential difference data received by all receiving electrodes in the 2# drilling hole is 2# drilling hole single-hole sounding data; potential difference data received by all receiving electrodes in the No. 1 drill hole are perspective data among holes;

step four, data classification and processing: respectively processing the 1# drilling hole single-hole sounding data, the 2# drilling hole single-hole sounding data and the inter-hole perspective data obtained in the fourth step to respectively obtain an abnormal resistivity map in the 1# drilling hole radial range, an abnormal resistivity map in the 2# drilling hole radial range and an inter-hole perspective abnormal map;

step five, determining the actual position of the abnormal body:

step 5.1, determining the drilling depth of the abnormal body on the comprehensive result graph of the three graphs obtained in the step five;

step 5.2, predicting the radial distance M of the lowest value of the abnormal body in the drilling depth;

step 5.3, two reference lines which are parallel to the 1# drilling hole and have the distance M with the 1# drilling hole are made on two sides of the 1# drilling hole: 1 line on the left side and 2 lines on the right side of the 1# borehole; two reference lines which are parallel to the 2# drilling hole and are at a distance M from the 2# drilling hole are made on two sides of the 2# drilling hole: 3 lines on the left side and 4 lines on the right side of the No. 2 drill hole; forming four reference lines in total;

and 5.4, extracting resistivity values on the four reference lines, correspondingly making four curves, comparing the same lateral position resistivity values, and obtaining the actual position of the abnormal body by taking the abnormal amplitude as a judgment standard.

Specifically, the two horizontal drilling holes form an included angle of 60 degrees, and the drilling depth is 100-120 m.

Specifically, in 1# drilling and 2# drilling, 1# drilling is located the tunnel axis left side, and 2# drilling is located the tunnel axis right side.

Specifically, in step 5.4, four curves are drawn corresponding to the resistivity values of the four reference lines, the same lateral position resistivity values are compared, the abnormal amplitudes are used as the judgment standard, and the abnormal amplitudes of the four curves corresponding to the 1 line, the 2 line, the 3 line and the 4 line are (i), (ii), (iii) and (iv):

(1) if the first step is greater than the second step, the abnormal body is positioned on the left side of the 1# drilled hole and is matched with the 1# drilled hole single-hole depth measuring position;

(2) if the first step is less than the second step and the third step is less than the fourth step, the abnormal body is positioned on the right side of the 2# drilling hole and is matched with the 2# drilling hole single-hole depth measuring position;

(3) if the first and second drilling holes are equal to each other and larger than the third and fourth drilling holes, the abnormal body is positioned between the 1# drilling hole and the 2# drilling hole and is deviated to the left of the roadway axis; the perspective result is reliable;

(4) if the third and fourth are equal and larger than the first and second, the abnormal body is positioned between the 1# drilling hole and the 2# drilling hole and is inclined to the right of the roadway axis; the perspective result is reliable.

Compared with the prior art, the invention has the beneficial technical effects that:

the method can improve the grounding condition of the electrode in the hole by combining the pushing of the inflatable air bag with the water-absorbent resin layer, has feasibility in method theory, and can verify the detection results by dividing the detection data into three parts in a saturated measurement mode; the detection result is improved from the traditional one-dimensional interpretation to the two-dimensional plane interpretation, and meanwhile, the interpretation precision is greatly improved.

In the current application, an advanced perspective detection example of the horizontal drilling does not appear, and the simulation example provided by the invention can be used for visually displaying the actual detection construction effect; by adopting the perspective method and further combining the single-hole depth measurement result, the safety guarantee of the tunnel excavation axis within the range of 20m beside the tunnel excavation axis is greatly improved.

Drawings

FIG. 1 is a top view of a look-ahead borehole distribution;

FIG. 2 is a schematic view of an electrode arrangement in a well;

FIG. 3 is a schematic diagram of an electrode in a well;

FIG. 4 is a schematic view of the operation mode of the electrodes in the holes;

FIG. 5 is a schematic diagram of three data control regions under saturation measurement;

fig. 6 is an analysis diagram of inversion analysis and comparison results.

The reference numerals have the meanings given below:

1-multi-core cable in hole, 2-inflatable air bag, 3-drill hole, 4-drill hole inner wall;

11-multi-core cable, 111-cable inner core, 12-hole electrode, 121-copper electrode, 122-water-absorbent resin layer;

the invention is described in detail below with reference to the drawings and the detailed description.

Detailed Description

The direct current electrical method detection technology in the ground vertical drilling is widely applied, the two-hole perspective method is higher in detection result precision and more accurate in positioning of abnormal bodies, and perspective research is carried out by utilizing underground horizontal advanced drilling of a coal mine, so that a powerful means for guaranteeing safe tunneling of a coal mine roadway is provided.

The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention. The present invention will be described in further detail with reference to examples.