CN-116857011-B - Advanced trend early warning method for rock burst temporary working face

Abstract

The invention discloses an advance trend early warning method for a rock burst temporary empty working face, which is concretely implemented according to the following steps of determining an early warning threshold value selected working face sample, determining an early warning threshold value sample area, a yellow early warning line and a red early warning line according to the selected working face sample, determining a dynamic period increment of the advance area of the working face, determining a static fixed increment coefficient of the advance area of the working face, estimating an advance area microseismic event accumulated energy curve under different extraction speed conditions in the next stage of the working face according to the steps 2-4, and determining whether early warning treatment is carried out according to the microseismic event accumulated energy curve in the step 5. The working face advanced trend early warning method can analyze the working face impact risk key areas in a targeted manner, predicts the impact risk degree of the working face in the next stage, has great significance in guiding the working face to take disposal measures in advance and taking reasonable pushing and collecting speed, and is beneficial to safe and efficient production of the working face.

Inventors

• Jin Junxiao
• XIE JIAHAO
• HAO XIAOQI
• CAO JINGLONG
• SUN MINGMING
• DUAN YUQING
• HAN GANG
• LIU HU
• ZHAO YI
• LI HAO
• WU XIAORU
• LIU YANG
• WANG YUAN
• MOU LIANG

Assignees

• 中煤能源研究院有限责任公司

Dates

Publication Date

20260508

Application Date

20230602

Claims (6)

1. 1. The advanced trend early warning method for the rock burst temporary working face is characterized by comprising the following steps of: Step 1, determining a working face sample selected by an early warning threshold value; step 2, determining an early warning threshold sample area, a yellow early warning line and a red early warning line according to a selected working face sample, wherein the method is implemented according to the following steps: 2.1, establishing microseismic event plane coordinates, namely taking the intersection point of the positive side and the cut hole of the working face facing the empty roadway as an origin 0, taking the pushing and picking direction of the working face as an X-axis direction, and taking the direction of the facing the empty roadway towards the solid coal roadway as a Y-axis direction; 2.2, projecting a historical microseismic event onto a Y axis along the X axis in the working face sample selected in the step 1, dividing the Y axis by taking S Y as a space, analyzing the accumulated distribution condition of microseismic energy in each section, and determining an important research area A Y （Y 1 ,Y 2 in the Y axis direction under the influence of a goaf on the working face, wherein S Y represents a dividing space in the Y axis direction, and A Y represents an important research area in the Y axis direction; 2.3, projecting the microseismic events in the key research area A Y （Y 1 ,Y 2 to an X axis along the Y axis, dividing the X axis by taking S X as a space, analyzing the accumulated distribution condition of the microseismic energy in each section, and forming a historical microseismic event accumulated energy curve C 0 in the key research area A X （X 1 ,X 2 along the X axis direction, wherein S X represents the dividing space in the X axis direction, and A X represents the key research area in the X axis direction; Step 2.4, identifying an area A XY where the impact appearing event is located, namely an early warning threshold sample area AT, wherein the area is located in an A X （X 1 ,X 2 direction along an X axis and is located in an A Y （Y 1 ,Y 2 direction along a Y axis, wherein A XY represents the area where the impact appearing event is located, and AT represents the early warning threshold sample area; Step 2.5, analyzing the accumulated energy E AT of the microseismic event in the early warning threshold sample area AT to be E AT1 ,E AT2 ,……,E ATn respectively, wherein E AT represents the accumulated energy of the microseismic event; Step 2.6, taking MIN (E AT1 ,E AT2 ,……,E ATn ) as a yellow early warning line for early warning of the advance trend, and taking AVE (E AT1 ,E AT2 ,……,E ATn ) as a red early warning line for early warning of the advance trend; step 3, determining dynamic period increment of the working face lead area; step 4, determining static fixed increment coefficients of the working surface lead area; Step 5, estimating a cumulative energy curve of the microseismic event of the advance region under different stoping speed conditions at the next stage of the working surface according to the steps 2-4; And 6, determining whether to perform early warning treatment according to the microseismic event accumulated energy curve in the step 5.
2. 2. The method for early warning of advanced trends of rock burst face in the air according to claim 1, wherein the step 1 is specifically to collect historical impact development events of mines, determine a working face sample selected by an early warning threshold, and refer to the impact development event of the nearby similar mine if the mine has no impact development event.
3. 3. The method for early warning of advanced trends of rock burst working face according to claim 1, wherein the step 3 is specifically implemented according to the following steps: Step 3.1, selecting a similar impact appearing event as a period increment basis of the advance area according to the current condition of the working face based on the accumulated energy E AT of the microseismic event in the early warning threshold value sample area AT in step 2.5; Step 3.2, expanding the range of two sides of an impact display event early warning threshold value sample area AT to be a sensitivity analysis area SA, recording the current pushing and sampling speed as V 0 , and macroscopically analyzing the microearthquake accumulated energy increment delta E DF in fixed areas with different periods in the range by adopting a fixed area method; step 3.3, analyzing sensitivity of the microseismic accumulated energy increment delta E DF in the early warning threshold sample area AT compared with the peripheral area by comparing the microseismic accumulated energy increment delta E DF , and selecting an optimal early warning period BWP; Step 3.4, analyzing the microseismic accumulated energy increment delta E n of the microseismic event in the early warning threshold sample area AT in the working face advance area delta X n by adopting a fixed working face method, wherein delta X n represents the working face advance area (delta X 1 ,△X 2 ,……,△X n ）,△E n represents the microseismic accumulated energy increment (delta E 1 ,△E 2 ,……,△E n ); And 3.5, carrying out statistical analysis on the microseismic events of the working face, macroscopically analyzing a microseismic increment proportionality coefficient lambda 1 between different pushing and extracting speeds, and analogizing that the dynamic period increment of the working face advance area under the condition of different pushing and extracting speeds is lambda 1 （△E 1 ,△E 2 ,……,△E n .
4. 4. The method for early warning of the advance trend of the rock burst face in the empty working face according to claim 3, wherein the step 4 specifically comprises screening influence factors F i according to geological occurrence and mining technical conditions of the working face, analyzing static influence degree lambda Fi through historical data, and identifying static fixed increment coefficients lambda 2 =Πλ Fi in a working face advance area delta X n in the step 3.4, wherein lambda Fi represents static influence degree parameters, and lambda 2 represents static fixed increment coefficients.
5. 5. The method for early warning of an advance trend of an impact ground pressure to air working surface according to claim 4, wherein the step 5 is specifically to record accumulated energy C of microseismic events from working surface recovery in real time based on a current working surface 0 The dynamic period increment and static fixed increment coefficient delta E=lambda 1 λ 2 （△E 1 ,△E 2 ,……,△E n of the advance region of the working surface are overlapped, and the microseismic accumulated energy curve C of the advance region under different recovery speeds of the next stage of the working surface is estimated i =C 0 And (3) delta E, wherein i represents the pushing speed, i=1, 2, n, C i represents the advance region microseismic accumulated energy curve, and C 0 Representing a microseismic event cumulative energy curve, and ΔE represents a microseismic cumulative energy delta curve.
6. 6. The method for early warning of advanced trends of rock burst working face according to claim 5, wherein the step 6 is specifically implemented according to the following steps: step 6.1, if the microseismic event accumulated energy curve C 0 If the pre-warning line area is exceeded, the pre-warning treatment is directly carried out without pre-warning trend estimation; if the microseismic event is accumulated with the energy curve C 0 If the early warning line area is not exceeded, estimating an accumulated energy curve C i 、C i+1 、C i+2 of the microseismic event of the advanced area under the condition that the working surface is at a constant speed or accelerated in a next period on the basis of the existing pushing speed i; if the microseismic event accumulated energy curve C i has a situation of exceeding the area of the early warning line, early warning treatment is carried out on the basis of the pushing speed i; If the microseismic event accumulated energy curve C i does not exist in the area exceeding the early warning line, but the microseismic event accumulated energy curve C i+1 exists in the area exceeding the early warning line, suggesting that the pushing speed of the working face is not greater than i and the pushing speed is uniform, and enhancing the monitoring strength; if the microseismic event accumulated energy curve C i+1 does not exist in the area exceeding the early warning line, but the microseismic event accumulated energy curve C i+2 exists in the area exceeding the early warning line, suggesting that the pushing speed of the working face is not greater than i+1 and the pushing speed is uniform, enhancing the monitoring strength, and the like; and 6.2, if the accumulated energy of the microseismic events in the working face advanced region exceeds the red early warning line, the working face directly stops working, a professional technician performs comprehensive analysis, after all the investigation and release of the risk points in the working face advanced region, the pushing and picking speed is adjusted by 1-2 cutters to continue working, and if the accumulated energy of the microseismic events in the working face advanced region exceeds the yellow early warning line, after all the investigation and release of the risk points in the working face advanced region, the pushing and picking speed cannot exceed the current pushing and picking speed to continue working, and meanwhile, the monitoring strength is required to be enhanced.

Description

Advanced trend early warning method for rock burst temporary working face Technical Field The invention belongs to the technical field of coal mine dynamic disaster monitoring and early warning, and relates to an advanced trend early warning method for an impact ground pressure temporary working face. Background In recent years, along with the continuous increase of the mining depth, the stress level of the coal and rock mass where the mining activity is located is also continuously increased, the geological condition is more complex, the original exploration degree can not meet the requirement of high-strength mining on the geological condition, and rock burst gradually becomes one of main disasters which restrict the efficient production of the deep mine. The research shows that the rock burst has high concealment and randomness, and the rock burst early warning system does not collect abnormal precursor information before a plurality of rock burst accidents occur. Therefore, the key point of rock burst prevention and control is to effectively monitor and identify the dangerous area and the development trend of dangerous state of the rock burst in time, pertinently perform manual intervention on the rock burst inoculation process of the dangerous area, release the accumulated energy of the coal rock mass in advance, and block the force source for the occurrence of the rock burst, thereby preventing the occurrence of the rock burst. At present, an impact risk monitoring system combining an area with a local area is established in an rock burst mine, the area monitoring covers a mine mining area, a microseismic monitoring method and the like are adopted for dynamic load monitoring, the local area monitoring needs to cover an impact rock burst risk area, and a drilling cutting method, a stress monitoring method, an electromagnetic radiation method and the like are adopted for static load monitoring. The microseismic monitoring can effectively monitor the process of fracture and breakage of the overlying strata of the working face, can determine parameters such as time, position, strength and the like of microseismic events in real time, and provides possibility for realizing structural damage and rule analysis of the overlying strata of the working face. In the actual stoping process of the working face, absolute value and relative value early warning is mainly carried out through microseismic monitoring data, the early warning accuracy is not high, the prediction and forecast has obvious hysteresis, and the impact risk of the working face in the next stage cannot be intuitively predicted. According to the method, geological and mining technical factors are comprehensively considered, and a microseismic monitoring space-time effect is combined, so that an advanced trend early warning method for the rock burst temporary working face is provided, and the method has important significance in guiding the safe and efficient production of the rock burst working face. Disclosure of Invention The invention aims to provide an advanced trend early warning method for an impact ground pressure null working face, which solves the problems of low accuracy and untimely prediction information of the early warning method in the prior art. The technical scheme adopted by the invention is that the advanced trend early warning method for the rock burst face working face is implemented according to the following steps: Step 1, determining a working face sample selected by an early warning threshold value; step 2, determining an early warning threshold sample area, a yellow early warning line and a red early warning line according to the selected working face sample; step 3, determining dynamic period increment of the working face lead area; step 4, determining static fixed increment coefficients of the working surface lead area; Step 5, estimating a cumulative energy curve of the microseismic event of the advance region under different stoping speed conditions at the next stage of the working surface according to the steps 2-4; And 6, determining whether to perform early warning treatment according to the microseismic event accumulated energy curve in the step 5. The invention is also characterized in that: The method specifically comprises the steps of collecting historical mine impact showing events, determining an early warning threshold value, selecting a working face sample, and if the mine does not have the impact showing events, referring to the impact showing events of the similar mine. The step2 is specifically implemented according to the following steps: 2.1, establishing microseismic event plane coordinates, namely taking the intersection point of the positive side and the cut hole of the working face facing the empty roadway as an origin 0, taking the pushing and picking direction of the working face as an X-axis direction, and taking the direction of the facing the empty roadway towards the solid coal roadway as a