CN113882901A - Comprehensive early warning system based on dynamic and static load rock burst danger superposition - Google Patents
Comprehensive early warning system based on dynamic and static load rock burst danger superposition Download PDFInfo
- Publication number
- CN113882901A CN113882901A CN202111084258.0A CN202111084258A CN113882901A CN 113882901 A CN113882901 A CN 113882901A CN 202111084258 A CN202111084258 A CN 202111084258A CN 113882901 A CN113882901 A CN 113882901A
- Authority
- CN
- China
- Prior art keywords
- dynamic
- load
- static load
- coal
- mining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003068 static effect Effects 0.000 title claims abstract description 133
- 239000011435 rock Substances 0.000 title claims abstract description 79
- 238000005065 mining Methods 0.000 claims abstract description 153
- 239000003245 coal Substances 0.000 claims abstract description 111
- 238000009412 basement excavation Methods 0.000 claims abstract description 43
- 238000004364 calculation method Methods 0.000 claims abstract description 41
- 238000005422 blasting Methods 0.000 claims description 51
- 238000000034 method Methods 0.000 claims description 48
- 230000033001 locomotion Effects 0.000 claims description 42
- 238000012544 monitoring process Methods 0.000 claims description 15
- 238000005553 drilling Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000011156 evaluation Methods 0.000 abstract description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
- E21F17/185—Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mathematical Physics (AREA)
- General Engineering & Computer Science (AREA)
- Data Mining & Analysis (AREA)
- Databases & Information Systems (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Analysis (AREA)
- Software Systems (AREA)
- Computational Mathematics (AREA)
- Algebra (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
A comprehensive early warning system based on dynamic and static load rock burst danger superposition comprises the following steps: step 1: measuring the medium density U of the coal rock layer in the mining area, wherein the medium densities of the coal rock layers at different positions are different, and step 2: with the advancing of the excavation, after the excavation depth advances for a fixed distance, the static load stress Os of the excavation face at the moment is measured immediately, the possibility of rock burst occurring in the current environment is evaluated by calculating and superposing the static load, the dynamic load and the gas pressure, more comprehensive risk evaluation is provided for underground operation and work, in the calculation of the dynamic and static load risk superposition, a variable F which is continuously changed along with the excavation depth is added to play a role of serving as a safety warning line, the safety of the underground operation is further ensured, and the safety guarantee is provided for the safe and efficient production in the underground.
Description
Technical Field
The invention relates to the technical field of rock burst early warning, in particular to a comprehensive early warning system based on dynamic and static load rock burst danger superposition.
Background
According to the source and loading form of the load, the rock burst can be divided into static rock burst and dynamic rock burst. Dynamic load rock burst is a sudden instability phenomenon which occurs under the superposition of dynamic and static loads. The existing rock burst occurrence monitoring and early warning are mainly developed from the perspective of coal properties or coal-rock structural characteristics, and are rarely monitored and early warned from the aspect that the coal and coal-rock structural characteristics are affected by dynamic and static loads.
The source of the coal rock gas dynamic disaster comprises static load stress Os of the coal rock mass, mining induced dynamic load stress Od and gas pressure Og in coal rock mass cracks, wherein the static load stress Os has close relation with the mining area of a mining area, the depth of a coal rock layer, the volume weight, the lateral pressure coefficient lambda and a supporting stress concentration coefficient k, the dynamic load stress Od has close relation with vibration waves Z1 and blasting shock waves generated by various mechanical movements, the gas pressure Og has close relation with the depth of the coal rock layer, and a comprehensive early warning system for rock burst can be provided by effectively monitoring and calculating variables in the static load stress Os, the dynamic load stress Od and the gas pressure Og.
Disclosure of Invention
The invention aims to provide a comprehensive early warning system based on dynamic and static load rock burst danger superposition, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a comprehensive early warning system based on dynamic and static load rock burst danger superposition comprises the following steps:
step 1: the medium density U of the coal rock stratum of the mining area is measured, because the medium densities of the coal rock strata at different positions are different, in the calculation of the comprehensive early warning in the dynamic and static load superposition mode, the medium density U of the coal rock stratum of the mining area plays a critical role in the calculation of the dynamic and static loads, and the medium density U needs to be measured;
step 2: with the advancement of mining, immediately after the mining depth advances for a fixed distance, the static load stress Os of the mining face at that time is measured, and the static load stress Os is approximately in a static state before the mining area does not spatially change, and can be calculated from the product of the medium density U of the coal and rock strata in the mining area and the sum of the mining area lateral pressure coefficient λ and the support stress concentration coefficient k, that is: UD (K + I), after the production is driven a fixed distance deep, the value of the static stress Os is recalculated to obtain the static stress Os closest to the actual value.
And step 3: the dynamic load of a mining area is monitored in real time, the monitoring method comprises the monitoring of the vibration wave Z1 generated by the movement of the coal mining machine and the impact force OZ2 caused by the blasting of a mining face, because a plurality of vibration waves Z1 generated by the movement of the coal mining machine possibly exist at the same time, all the vibration waves Z1 at the same time need to be measured and estimated to obtain a more accurate dynamic load value, and the impact force OZ2 caused by the blasting can be estimated and calculated by a computer according to the filling amount, the blasting position, the blasting depth and the coal strata medium density U during the blasting.
And 4, step 4: calculating the dynamic load brought by the vibration wave Z1 generated by the movement of the coal mining machine, and after calculating the dynamic load brought by the vibration wave Z1, estimating the dynamic load value of the mining area;
and 5: superposing the dynamic load brought by the vibration wave Z1 generated by the coal mining mechanical motion at the same moment and the impact OZ2 brought by the mining face blasting to obtain the sum Od of the superposed dynamic loads at the moment, namely;
Od=OZ1+OZ2；
step 6: calculating gas pressure Og of a coal rock stratum of a mining area by a drilling gas emission initial velocity method, recalculating the gas pressure value Og after the mining depth advances for a certain distance along with the advancing of mining, and calculating the gas pressure Og of the mining area in the early warning of impact ground pressure to calculate the integral dynamic and static load value in the current state, wherein the gas pressure has an inseparable relation with the property, density and depth of the coal rock stratum, and the gas pressure and the static load need to be synchronously measured and estimated according to the specific environment and depth;
and 7: after the gas pressure of the current excavation area is obtained, summing the obtained static load, dynamic load and gas pressure load, comparing the sum with the critical load Obmin when a dynamic disaster occurs to analyze whether the possibility of rock burst occurs or not, and summing the static load stress Os, the dynamic load superposition sum Od and the gas pressure Og at the same moment to obtain the total dynamic and static load sum;
i.e., O = Os + Od + Og;
and 8: comparing the superposition sum of dynamic and static loads with the critical load Obmin when a dynamic disaster occurs, and meanwhile, adding a variable F for playing a warning role in the calculation of the superposition sum of the dynamic and static loads, wherein the variable F is continuously increased along with the increase of the mining depth, because the variable factors in the calculation of the dynamic and static loads are increased along with the increase of the mining depth, in order to ensure the effectiveness of early warning, the variable F which is continuously increased along with the depth needs to be added in the comparison with the critical load Obmin, and the specific calculation method comprises the following steps: f =1.2H + C1, C1 is a constant, C1 is a safety value reserved at the initial excavation depth;
and step 9:
when O = Os + Od + Og + F is more than or equal to Obmin, and when the sum of the static load, the dynamic load, the gas pressure and the variable F at the current depth is more than the critical load Obmin, the early warning system can send out an alarm through the underground alarm system.
Further, the method comprises the following steps:
in step 1, the method for measuring the static load stress Os of the excavation region is that the depth D of the excavation face is accurately calculated by the coal mine underground positioning system, and then the static load stress Os = DU (K + I) of the excavation region at that time.
Further, the method comprises the following steps:
in step 3, the dynamic load caused by the vibration wave Z1 generated by the movement of the coal mining machine is monitored in real time by arranging a vibration wave detector at a position two meters away from the coal mining machine, so that the vibration wave Z1 generated by the movement of the coal mining machine is monitored.
Further, the method comprises the following steps:
in step 4, the load caused by the vibration wave Z1 generated by the coal mining machine motion is calculated by the method that the vibration Z1 generated by the coal mining machine motion comprises Y1 and Y2 · Yn, because the vibration of a plurality of moving machines may exist at the same time, and the transmission speed V and the particle peak vibration speed (Vpp) of the coal mining machine vibration wave are calculated by the arranged vibration wave detector, so that the sum of a single dynamic load OYn caused by the coal mining machine vibration and a plurality of dynamic loads caused by a plurality of coal mining machine vibrations is obtained, wherein Yn represents the moving machine at the position, OYn represents the dynamic load caused by the machine at the position, and OZ1 represents the sum of the dynamic loads caused by all the moving machines at the same time;
further, the method comprises the following steps:
in step 4, the dynamic load value OZ2 brought by the blasting is estimated by a computer according to the filling quantity, the blasting position, the blasting depth and the coal stratum medium density U during blasting.
Further, the method comprises the following steps:
in step 5, in the process of recalculating the pressure value of the subsequent gas, the calculation method is as follows: og = (1+ W) (H-Hc) + C2, where C2 is the gas pressure at the initial excavation depth, W is the gas growth rate, i.e., the number of gas pressure increases per meter, and is set to the maximum value of the upper limit of the gas growth rate of 0.005, H is the current excavation depth, and Hc is the initial excavation depth, and thus the gas pressure Og at the current depth is calculated.
Further, the method comprises the following steps of,
respectively calculating the loads brought by the P wave and the S wave in the vibration wave Z1 according to the formula of claim 4, wherein the load values brought by the P wave and the S wave in the vibration wave are different, and in a specific calculation method, the dynamic loads OZ1 brought by the P wave and the S wave are respectively obtained by performing the respective calculation;
respectively calculating the total load under the conditions of P wave and S wave, and respectively comparing the total load with the critical load Obmin when a dynamic disaster occurs;
when the total load under any one condition is larger than the critical load Obmin, an alarm is given through the underground alarm system.
Compared with the prior art, the comprehensive early warning system based on dynamic and static load rock burst danger superposition evaluates the possibility of rock burst generation under the current environment by calculating and superposing the static load, the dynamic load and the gas pressure, provides more comprehensive risk evaluation for underground operation and work, and adds a variable F which is continuously changed along with the excavation depth in the calculation of the dynamic and static load danger superposition to play a role of a safety warning line, further ensures the safety of underground operation, and provides safety guarantee for safe and efficient underground production.
Compared with the prior art, the comprehensive early warning system based on dynamic and static load rock burst danger superposition increases the accuracy of evaluation and calculation of dynamic loads and improves the effectiveness of safety early warning by calculating and superposing the dynamic loads generated by mechanical motion at different positions at the same time.
Compared with the prior art, the comprehensive early warning system based on dynamic and static load rock burst danger superposition measures the gas pressure at the moment by calculating the gas pressures of different coal qualities and different depths, further increases the accuracy of rock burst danger superposition calculation, and further improves the effectiveness of safety early warning.
Detailed Description
The present invention is further described with reference to the following detailed description, wherein the drawings are for illustrative purposes only and are not intended to be limiting, and all other embodiments within the scope of the present invention will be apparent to those of ordinary skill in the art based on the present detailed description without any inventive step.
Example 1
The invention provides a technical scheme under the condition that the excavation depth needs to be increased when no dynamic load Od and gas pressure Og exist and only static load exists:
a comprehensive early warning system based on dynamic and static load rock burst danger superposition comprises the following steps:
step 1: measuring the medium density U of the coal rock stratum of the mining area, wherein the medium densities of the coal rock stratum at different positions are different, and the medium density U of the coal rock stratum of the mining area plays a critical role in the calculation of dynamic and static loads in the calculation of the comprehensive early warning of the dynamic and static load superposition mode;
step 2: with the advancement of mining, immediately after the mining depth advances for a fixed distance, the static load stress Os of the mining face at that time is measured, and the static load stress Os is approximately in a static state before the mining area does not spatially change, and can be calculated from the product of the medium density U of the coal and rock strata in the mining area and the sum of the mining area lateral pressure coefficient λ and the support stress concentration coefficient k, that is: UD (K + I), after the production is driven a fixed distance deep, the value of the static stress Os is recalculated to obtain the static stress Os closest to the actual value.
And step 3: the dynamic load of a mining area is monitored in real time, the monitoring method comprises the monitoring of the vibration wave Z1 generated by the movement of the coal mining machine and the impact force OZ2 caused by the blasting of a mining face, because a plurality of vibration waves Z1 generated by the movement of the coal mining machine possibly exist at the same time, all the vibration waves Z1 at the same time need to be measured and estimated to obtain a more accurate dynamic load value, and the impact force OZ2 caused by the blasting can be estimated and calculated by a computer according to the filling amount, the blasting position, the blasting depth and the coal strata medium density U during the blasting.
And 4, step 4: calculating the dynamic load brought by the vibration wave Z1 generated by the movement of the coal mining machine, and after calculating the dynamic load brought by the vibration wave Z1, estimating the dynamic load value of the mining area;
and 5: superposing the dynamic load brought by the vibration wave Z1 generated by the coal mining mechanical motion at the same moment and the impact OZ2 brought by the mining face blasting to obtain the sum Od of the superposed dynamic loads at the moment, namely;
Od=0；
step 6: calculating the gas pressure Og of the coal rock stratum of the mining area by a drilling gas emission initial velocity method;
Og=0；
and 7: after the gas pressure of the current excavation area is obtained, summing the obtained static load, dynamic load and gas pressure load, comparing the sum with the critical load Obmin when a dynamic disaster occurs to analyze whether the possibility of rock burst occurs or not, and summing the static load stress Os, the dynamic load superposition sum Od and the gas pressure Og at the same moment to obtain the total dynamic and static load sum;
i.e., O = Os;
and 8: comparing the superposition sum of dynamic and static loads with the critical load Obmin when a dynamic disaster occurs, and meanwhile, adding a variable F for playing a warning role in the calculation of the superposition sum of the dynamic and static loads, wherein the variable F is continuously increased along with the increase of the mining depth, because the variable factors in the calculation of the dynamic and static loads are increased along with the increase of the mining depth, in order to ensure the effectiveness of early warning, the variable F which is continuously increased along with the depth needs to be added in the comparison with the critical load Obmin, and the specific calculation method comprises the following steps: f =1.2H + C1, C1 is a constant, C1 is a safety value reserved at the initial excavation depth;
and step 9:
when O = Os + F is larger than or equal to Obmin, and when the sum of the static load, the dynamic load, the gas pressure and the variable F at the current depth is larger than the critical load Obmin, the early warning system gives an alarm through the underground warning system.
Further, the method comprises the following steps:
in step 1, the method for measuring the static load stress Os of the excavation region is that the depth D of the excavation face is accurately calculated by the coal mine underground positioning system, and then the static load stress Os = DU (K + I) of the excavation region at that time.
Example 2
The invention provides a technical scheme that when gas pressure Og is absent, and static load Os and dynamic load Od exist, and a moving machine needs to be started or blasting is carried out:
a comprehensive early warning system based on dynamic and static load rock burst danger superposition comprises the following steps:
step 1: measuring the medium density U of the coal rock stratum of the mining area, wherein the medium densities of the coal rock stratum at different positions are different, and the medium density U of the coal rock stratum of the mining area plays a critical role in the calculation of dynamic and static loads in the calculation of the comprehensive early warning of the dynamic and static load superposition mode;
step 2: with the advancement of mining, immediately after the mining depth advances for a fixed distance, the static load stress Os of the mining face at that time is measured, and the static load stress Os is approximately in a static state before the mining area does not spatially change, and can be calculated from the product of the medium density U of the coal and rock strata in the mining area and the sum of the mining area lateral pressure coefficient λ and the support stress concentration coefficient k, that is: UD (K + I), after the production is driven a fixed distance deep, the value of the static stress Os is recalculated to obtain the static stress Os closest to the actual value.
And step 3: the dynamic load of a mining area is monitored in real time, the monitoring method comprises the monitoring of the vibration wave Z1 generated by the movement of the coal mining machine and the impact force OZ2 caused by the blasting of a mining face, because a plurality of vibration waves Z1 generated by the movement of the coal mining machine possibly exist at the same time, all the vibration waves Z1 at the same time need to be measured and estimated to obtain a more accurate dynamic load value, and the impact force OZ2 caused by the blasting can be estimated and calculated by a computer according to the filling amount, the blasting position, the blasting depth and the coal strata medium density U during the blasting.
And 4, step 4: calculating the dynamic load brought by the vibration wave Z1 generated by the movement of the coal mining machine, and after calculating the dynamic load brought by the vibration wave Z1, estimating the dynamic load value of the mining area;
and 5: superposing the dynamic load brought by the vibration wave Z1 generated by the coal mining mechanical motion at the same moment and the impact OZ2 brought by the mining face blasting to obtain the sum Od of the superposed dynamic loads at the moment, namely;
Od=OZ1+OZ2；
step 6: calculating the gas pressure Og of the coal rock stratum of the mining area by a drilling gas emission initial velocity method;
Og=0；
and 7: after the gas pressure of the current excavation area is obtained, summing the obtained static load, dynamic load and gas pressure load, comparing the sum with the critical load Obmin when a dynamic disaster occurs to analyze whether the possibility of rock burst occurs or not, and summing the static load stress Os, the dynamic load superposition sum Od and the gas pressure Og at the same moment to obtain the total dynamic and static load sum;
i.e., O = Os + Od;
and 8: comparing the superposition sum of dynamic and static loads with the critical load Obmin when a dynamic disaster occurs, and meanwhile, adding a variable F for playing a warning role in the calculation of the superposition sum of the dynamic and static loads, wherein the variable F is continuously increased along with the increase of the mining depth, because the variable factors in the calculation of the dynamic and static loads are increased along with the increase of the mining depth, in order to ensure the effectiveness of early warning, the variable F which is continuously increased along with the depth needs to be added in the comparison with the critical load Obmin, and the specific calculation method comprises the following steps: f =1.2H + C1, C1 is a constant, C1 is a safety value reserved at the initial excavation depth;
and step 9:
when O = Os + Od + F is larger than or equal to Obmin, and when the sum of the static load, the dynamic load, the gas pressure and the variable F at the current depth is larger than the critical load Obmin, the early warning system can send out an alarm through the underground warning system.
Further, the method comprises the following steps:
in step 1, the method for measuring the static load stress Os of the excavation region is that the depth D of the excavation face is accurately calculated by the coal mine underground positioning system, and then the static load stress Os = DU (K + I) of the excavation region at that time.
Further, the method comprises the following steps:
in step 3, the dynamic load caused by the vibration wave Z1 generated by the movement of the coal mining machine is monitored in real time by arranging a vibration wave detector at a position two meters away from the coal mining machine, so that the vibration wave Z1 generated by the movement of the coal mining machine is monitored.
Further, the method comprises the following steps:
in step 4, the load of the vibration wave Z1 generated by the coal mining machine motion is calculated by the method that the vibration Z1 generated by the coal mining machine motion comprises Y1 and Y2 · Yn, because the vibration of a plurality of moving machines can exist at the same time, the transmission speed V and the particle peak vibration speed (Vpp) of the vibration wave of the coal mining machine are calculated by the vibration wave detector, so as to obtain the sum of a single dynamic load OYn caused by the vibration of the coal mining machine and a plurality of dynamic loads caused by the vibration of the plurality of coal mining machines, wherein Yn represents the moving machine at the position, OYn represents the dynamic load caused by the machine at the position, and OZ1 represents the sum of the dynamic loads caused by all the moving machines at the same time
Further, the method comprises the following steps:
in step 4, the dynamic load value OZ2 brought by the blasting is estimated by a computer according to the filling quantity, the blasting position, the blasting depth and the coal stratum medium density U during blasting.
Example 3
When the dynamic load Od is not available, and the static load Os and the gas pressure Og exist, under the condition that the excavation depth needs to be increased, the invention provides a technical scheme that:
a comprehensive early warning system based on dynamic and static load rock burst danger superposition comprises the following steps:
step 1: measuring the medium density U of the coal rock stratum of the mining area, wherein the medium densities of the coal rock stratum at different positions are different, and the medium density U of the coal rock stratum of the mining area plays a critical role in the calculation of dynamic and static loads in the calculation of the comprehensive early warning of the dynamic and static load superposition mode;
step 2: with the advancement of mining, immediately after the mining depth advances for a fixed distance, the static load stress Os of the mining face at that time is measured, and the static load stress Os is approximately in a static state before the mining area does not spatially change, and can be calculated from the product of the medium density U of the coal and rock strata in the mining area and the sum of the mining area lateral pressure coefficient λ and the support stress concentration coefficient k, that is: UD (K + I), after the production is driven a fixed distance deep, the value of the static stress Os is recalculated to obtain the static stress Os closest to the actual value.
And step 3: the dynamic load of a mining area is monitored in real time, the monitoring method comprises the monitoring of the vibration wave Z1 generated by the movement of the coal mining machine and the impact force OZ2 caused by the blasting of a mining face, because a plurality of vibration waves Z1 generated by the movement of the coal mining machine possibly exist at the same time, all the vibration waves Z1 at the same time need to be measured and estimated to obtain a more accurate dynamic load value, and the impact force OZ2 caused by the blasting can be estimated and calculated by a computer according to the filling amount, the blasting position, the blasting depth and the coal strata medium density U during the blasting.
And 4, step 4: calculating the dynamic load brought by the vibration wave Z1 generated by the movement of the coal mining machine, and after calculating the dynamic load brought by the vibration wave Z1, estimating the dynamic load value of the mining area;
and 5: superposing the dynamic load brought by the vibration wave Z1 generated by the coal mining mechanical motion at the same moment and the impact OZ2 brought by the mining face blasting to obtain the sum Od of the superposed dynamic loads at the moment, namely;
Od=0；
step 6: calculating gas pressure Og of a coal rock stratum of a mining area by a drilling gas emission initial velocity method, recalculating the gas pressure value Og after the mining depth advances for a certain distance along with the advancing of mining, and calculating the gas pressure Og of the mining area in the early warning of impact ground pressure to calculate the integral dynamic and static load value in the current state, wherein the gas pressure has an inseparable relation with the property, density and depth of the coal rock stratum, and the gas pressure and the static load need to be synchronously measured and estimated according to the specific environment and depth;
and 7: after the gas pressure of the current excavation area is obtained, summing the obtained static load, dynamic load and gas pressure load, comparing the sum with the critical load Obmin when a dynamic disaster occurs to analyze whether the possibility of rock burst occurs or not, and summing the static load stress Os, the dynamic load superposition sum Od and the gas pressure Og at the same moment to obtain the total dynamic and static load sum;
i.e., O = Os + Og;
and 8: comparing the superposition sum of dynamic and static loads with the critical load Obmin when a dynamic disaster occurs, and meanwhile, adding a variable F for playing a warning role in the calculation of the superposition sum of the dynamic and static loads, wherein the variable F is continuously increased along with the increase of the mining depth, because the variable factors in the calculation of the dynamic and static loads are increased along with the increase of the mining depth, in order to ensure the effectiveness of early warning, the variable F which is continuously increased along with the depth needs to be added in the comparison with the critical load Obmin, and the specific calculation method comprises the following steps: f =1.2H + C1, C1 is a constant, C1 is a safety value reserved at the initial excavation depth;
and step 9:
when O = Os + Og + F is larger than or equal to Obmin, and when the sum of the static load, the dynamic load, the gas pressure and the variable F at the current depth is larger than the critical load Obmin, the early warning system can send out an alarm through the underground warning system.
Further, the method comprises the following steps:
in step 1, the method for measuring the static load stress Os of the excavation region is that the depth D of the excavation face is accurately calculated by the coal mine underground positioning system, and then the static load stress Os = DU (K + I) of the excavation region at that time.
Example 4
When the static load Os and the dynamic load Od gas pressure Og exist simultaneously, under the condition that a moving machine needs to be started or blasting is carried out, the invention provides a technical scheme that:
a comprehensive early warning system based on dynamic and static load rock burst danger superposition comprises the following steps:
step 1: the medium density U of the coal rock stratum of the mining area is measured, because the medium densities of the coal rock strata at different positions are different, in the calculation of the comprehensive early warning in the dynamic and static load superposition mode, the medium density U of the coal rock stratum of the mining area plays a critical role in the calculation of the dynamic and static loads, and the medium density U needs to be measured;
step 2: with the advancement of mining, immediately after the mining depth advances for a fixed distance, the static load stress Os of the mining face at that time is measured, and the static load stress Os is approximately in a static state before the mining area does not spatially change, and can be calculated from the product of the medium density U of the coal and rock strata in the mining area and the sum of the mining area lateral pressure coefficient λ and the support stress concentration coefficient k, that is: UD (K + I), after the production is driven a fixed distance deep, the value of the static stress Os is recalculated to obtain the static stress Os closest to the actual value.
And step 3: the dynamic load of a mining area is monitored in real time, the monitoring method comprises the monitoring of the vibration wave Z1 generated by the movement of the coal mining machine and the impact force OZ2 caused by the blasting of a mining face, because a plurality of vibration waves Z1 generated by the movement of the coal mining machine possibly exist at the same time, all the vibration waves Z1 at the same time need to be measured and estimated to obtain a more accurate dynamic load value, and the impact force OZ2 caused by the blasting can be estimated and calculated by a computer according to the filling amount, the blasting position, the blasting depth and the coal strata medium density U during the blasting.
And 4, step 4: calculating the dynamic load brought by the vibration wave Z1 generated by the movement of the coal mining machine, and after calculating the dynamic load brought by the vibration wave Z1, estimating the dynamic load value of the mining area;
and 5: superposing the dynamic load brought by the vibration wave Z1 generated by the coal mining mechanical motion at the same moment and the impact OZ2 brought by the mining face blasting to obtain the sum Od of the superposed dynamic loads at the moment, namely;
Od=OZ1+OZ2；
step 6: calculating gas pressure Og of a coal rock stratum of a mining area by a drilling gas emission initial velocity method, recalculating the gas pressure value Og after the mining depth advances for a certain distance along with the advancing of mining, and calculating the gas pressure Og of the mining area in the early warning of impact ground pressure to calculate the integral dynamic and static load value in the current state, wherein the gas pressure has an inseparable relation with the property, density and depth of the coal rock stratum, and the gas pressure and the static load need to be synchronously measured and estimated according to the specific environment and depth;
and 7: after the gas pressure of the current excavation area is obtained, summing the obtained static load, dynamic load and gas pressure load, comparing the sum with the critical load Obmin when a dynamic disaster occurs to analyze whether the possibility of rock burst occurs or not, and summing the static load stress Os, the dynamic load superposition sum Od and the gas pressure Og at the same moment to obtain the total dynamic and static load sum;
i.e., O = Os + Od + Og;
and 8: comparing the superposition sum of dynamic and static loads with the critical load Obmin when a dynamic disaster occurs, and meanwhile, adding a variable F for playing a warning role in the calculation of the superposition sum of the dynamic and static loads, wherein the variable F is continuously increased along with the increase of the mining depth, because the variable factors in the calculation of the dynamic and static loads are increased along with the increase of the mining depth, in order to ensure the effectiveness of early warning, the variable F which is continuously increased along with the depth needs to be added in the comparison with the critical load Obmin, and the specific calculation method comprises the following steps: f =1.2H + C1, C1 is a constant, C1 is a safety value reserved at the initial excavation depth;
and step 9:
when O = Os + Od + Og + F is more than or equal to Obmin, and when the sum of the static load, the dynamic load, the gas pressure and the variable F at the current depth is more than the critical load Obmin, the early warning system can send out an alarm through the underground alarm system.
Further, the method comprises the following steps:
in step 1, the method for measuring the static load stress Os of the excavation region is that the depth D of the excavation face is accurately calculated by the coal mine underground positioning system, and then the static load stress Os = DU (K + I) of the excavation region at that time.
Further, the method comprises the following steps:
in step 3, the dynamic load caused by the vibration wave Z1 generated by the movement of the coal mining machine is monitored in real time by arranging a vibration wave detector at a position two meters away from the coal mining machine, so that the vibration wave Z1 generated by the movement of the coal mining machine is monitored.
Further, the method comprises the following steps:
in step 4, the load caused by the vibration wave Z1 generated by the coal mining machine motion is calculated by the method that the vibration Z1 generated by the coal mining machine motion comprises Y1 and Y2 · Yn, because the vibration of a plurality of moving machines may exist at the same time, and the transmission speed V and the particle peak vibration speed (Vpp) of the coal mining machine vibration wave are calculated by the arranged vibration wave detector, so that the sum of a single dynamic load OYn caused by the coal mining machine vibration and a plurality of dynamic loads caused by a plurality of coal mining machine vibrations is obtained, wherein Yn represents the moving machine at the position, OYn represents the dynamic load caused by the machine at the position, and OZ1 represents the sum of the dynamic loads caused by all the moving machines at the same time;
further, the method comprises the following steps:
in step 4, the dynamic load value OZ2 brought by the blasting is estimated by a computer according to the filling quantity, the blasting position, the blasting depth and the coal stratum medium density U during blasting.
Further, the method comprises the following steps:
in step 5, in the process of recalculating the pressure value of the subsequent gas, the calculation method is as follows: og = (1+ W) (H-Hc) + C2, where C2 is the gas pressure at the initial excavation depth, W is the gas growth rate, i.e., the number of gas pressure increases per meter, and is set to the maximum value of the upper limit of the gas growth rate of 0.005, H is the current excavation depth, and Hc is the initial excavation depth, and thus the gas pressure Og at the current depth is calculated.
Compared with the prior art, the comprehensive early warning system based on dynamic and static load rock burst danger superposition evaluates the possibility of rock burst generation under the current environment by calculating and superposing the static load, the dynamic load and the gas pressure, provides more comprehensive risk evaluation for underground operation and work, and adds a variable F which is continuously changed along with the excavation depth in the calculation of the dynamic and static load danger superposition to play a role of a safety warning line, further ensures the safety of underground operation, and provides safety guarantee for safe and efficient underground production.
Compared with the prior art, the comprehensive early warning system based on dynamic and static load rock burst danger superposition increases the accuracy of evaluation and calculation of dynamic loads and improves the effectiveness of safety early warning by calculating and superposing the dynamic loads generated by mechanical motion at different positions at the same time.
Compared with the prior art, the comprehensive early warning system based on dynamic and static load rock burst danger superposition measures the gas pressure at the moment by calculating the gas pressures of different coal qualities and different depths, further increases the accuracy of rock burst danger superposition calculation, and further improves the effectiveness of safety early warning.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. For those skilled in the art, without departing from the principle of the present invention, several modifications, decorations, or changes may be made, and the above technical features may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (7)
1. A comprehensive early warning system based on dynamic and static load rock burst danger superposition is characterized by comprising the following steps:
step 1: measuring the medium density U of the coal rock layer of the mining area;
step 2: with the advancing of the excavation, immediately measuring the static load stress Os of the excavation face at the moment after the excavation depth advances for a fixed distance;
and step 3: monitoring dynamic loads of a mining area in real time, wherein the monitoring method comprises monitoring a vibration wave Z1 generated by the movement of a coal mining machine and impact force OZ2 caused by excavation face blasting;
and 4, step 4: calculating the dynamic load brought by the vibration wave Z1 generated by the movement of the coal mining machine;
and 5: superposing the dynamic load brought by the vibration wave Z1 generated by the coal mining mechanical motion at the same moment and the impact OZ2 brought by the mining face blasting to obtain the sum Od of the superposed dynamic loads at the moment, namely;
Od=OZ1+OZ2；
step 6: calculating the gas pressure Og of the coal rock layer in the mining area by a drilling gas emission initial velocity method, and recalculating the gas pressure value Og after the mining depth advances for a certain distance along with the advancement of the mining;
and 7: summing the static load stress Os, the dynamic load superposition sum Od and the gas pressure Og at the same moment to obtain the total dynamic and static load sum;
i.e., O = Os + Od + Og;
and 8: the sum of dynamic and static load superposition is compared with the critical load Obmin when a dynamic disaster occurs, meanwhile, a variable F used for playing a warning role is added in the calculation of the sum of dynamic and static load superposition, the variable F is continuously increased along with the increase of the mining depth, and the specific calculation method of the variable F is as follows: f =1.2H + C1;
and step 9:
when O = Os + Od + Og + F ≧ Obmin, an alarm is issued by the downhole alarm system.
2. The comprehensive early warning system based on dynamic and static load rock burst danger superposition is characterized in that; the method comprises the following steps:
in step 1, the method for measuring the static load stress Os of the mining area is that the depth D of the mining face is accurately calculated by the coal mine underground positioning system, and then the static load stress Os = UD (K + I) of the mining area at that time.
3. The comprehensive early warning system based on dynamic and static load rock burst danger superposition is characterized in that; the method comprises the following steps:
in step 3, the dynamic load caused by the vibration wave Z1 generated by the movement of the coal mining machine is monitored in real time by arranging a vibration wave detector at a position two meters away from the coal mining machine, so that the vibration wave Z1 generated by the movement of the coal mining machine is monitored.
4. The comprehensive early warning system based on dynamic and static load rock burst danger superposition is characterized in that the method comprises the following steps:
in step 4, the load calculation method brought by the vibration wave Z1 generated by the coal mining mechanical motion is that the vibration Z1 generated by the coal mining mechanical motion comprises Y1 and Y2 · Yn, the transmission speed V and the particle peak vibration speed (Vpp) of the coal mining mechanical vibration wave are calculated by the arranged vibration wave detector, so that the sum of a single dynamic load OYn brought by the coal mining mechanical vibration and a plurality of dynamic loads brought by a plurality of coal mining mechanical vibrations is obtained, and the calculation method is that;
5. the comprehensive early warning system based on dynamic and static load rock burst danger superposition is characterized in that the method comprises the following steps:
in step 4, the dynamic load value OZ2 brought by the blasting is estimated by a computer according to the filling quantity, the blasting position, the blasting depth and the coal stratum medium density U during blasting.
6. The comprehensive early warning system based on dynamic and static load rock burst danger superposition is characterized in that the method comprises the following steps:
in step 5, in the process of recalculating the pressure value of the subsequent gas, the calculation method is as follows: og = (1+ W) (H-Hc) + C2.
7. The comprehensive early warning system based on dynamic and static load rock burst danger superposition as claimed in any one of claim 4, characterized in that the method comprises,
calculating the loads caused by the P wave and the S wave in the vibration wave Z1 according to the formula of claim 4;
respectively calculating the total load under the conditions of P wave and S wave, and respectively comparing the total load with the critical load Obmin when a dynamic disaster occurs;
when the total load under any one condition is larger than the critical load Obmin, an alarm is given through the underground alarm system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111084258.0A CN113882901A (en) | 2021-09-16 | 2021-09-16 | Comprehensive early warning system based on dynamic and static load rock burst danger superposition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111084258.0A CN113882901A (en) | 2021-09-16 | 2021-09-16 | Comprehensive early warning system based on dynamic and static load rock burst danger superposition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113882901A true CN113882901A (en) | 2022-01-04 |
Family
ID=79009581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111084258.0A Pending CN113882901A (en) | 2021-09-16 | 2021-09-16 | Comprehensive early warning system based on dynamic and static load rock burst danger superposition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113882901A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878051A (en) * | 2022-06-16 | 2022-08-09 | 中国矿业大学 | Roadway side coal impact risk assessment method based on drilling stress distribution |
| CN115392061A (en) * | 2022-10-28 | 2022-11-25 | 北京科技大学 | Method for evaluating static and dynamic coupling of rock burst danger |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194263A (en) * | 2016-08-29 | 2016-12-07 | 中煤科工集团重庆研究院有限公司 | Coal mine gas disaster monitoring early-warning system and method for early warning |
| CN209510394U (en) * | 2018-12-29 | 2019-10-18 | 煤炭科学技术研究院有限公司 | A kind of getting working face coal and gas prominent real-time system for monitoring and pre-warning |
| CN111963243A (en) * | 2020-07-22 | 2020-11-20 | 中国矿业大学 | Rock burst danger monitoring and early warning method based on dynamic and static combined stress analysis |
| CN112594008A (en) * | 2020-12-17 | 2021-04-02 | 中国矿业大学 | Rock burst early warning method based on dynamic and static load disturbance superposition |
| CN113343548A (en) * | 2021-05-08 | 2021-09-03 | 北京科技大学 | Rock burst danger evaluation method based on dynamic and static load simulation |
-
2021
- 2021-09-16 CN CN202111084258.0A patent/CN113882901A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194263A (en) * | 2016-08-29 | 2016-12-07 | 中煤科工集团重庆研究院有限公司 | Coal mine gas disaster monitoring early-warning system and method for early warning |
| CN209510394U (en) * | 2018-12-29 | 2019-10-18 | 煤炭科学技术研究院有限公司 | A kind of getting working face coal and gas prominent real-time system for monitoring and pre-warning |
| CN111963243A (en) * | 2020-07-22 | 2020-11-20 | 中国矿业大学 | Rock burst danger monitoring and early warning method based on dynamic and static combined stress analysis |
| CN112594008A (en) * | 2020-12-17 | 2021-04-02 | 中国矿业大学 | Rock burst early warning method based on dynamic and static load disturbance superposition |
| CN113343548A (en) * | 2021-05-08 | 2021-09-03 | 北京科技大学 | Rock burst danger evaluation method based on dynamic and static load simulation |
Non-Patent Citations (1)
| Title |
|---|
| 窦林名等: "动静载叠加诱发煤岩瓦斯动力灾害原理及防治技术", 《中国矿业大学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878051A (en) * | 2022-06-16 | 2022-08-09 | 中国矿业大学 | Roadway side coal impact risk assessment method based on drilling stress distribution |
| CN114878051B (en) * | 2022-06-16 | 2023-02-03 | 中国矿业大学 | Roadway side coal impact risk assessment method based on drilling stress distribution |
| CN115392061A (en) * | 2022-10-28 | 2022-11-25 | 北京科技大学 | Method for evaluating static and dynamic coupling of rock burst danger |
| CN115392061B (en) * | 2022-10-28 | 2023-01-13 | 北京科技大学 | Method for evaluating static and dynamic coupling of rock burst danger |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113882901A (en) | Comprehensive early warning system based on dynamic and static load rock burst danger superposition | |
| CN105179018B (en) | A kind of coal mine rock burst detection method | |
| Ma et al. | Experimental Study on Vibration Reduction Technology of Hole‐by‐Hole Presplitting Blasting | |
| Huo et al. | Rock damage control for large-diameter-hole lateral blasting excavation based on charge structure optimization | |
| CN109631701B (en) | Numerical simulation method for tunnel blasting | |
| Dey et al. | Prediction of blast-induced overbreak from uncontrolled burn-cut blasting in tunnels driven through medium rock class | |
| CN111608663A (en) | Omnibearing pressure relief method for rock burst dangerous roadway of thick coal seam working face | |
| CN109681180B (en) | Method for pre-evaluating strong mine pressure effect of coal mine ground fracturing hard roof control stope | |
| CN104653226A (en) | Stress-gradient-based method for dividing coal impact ground pressure danger area | |
| Xue et al. | Rockburst prediction and analysis of activity characteristics within surrounding rock based on microseismic monitoring and numerical simulation | |
| CN111101952B (en) | Construction method for tunnel blasting of complex layered rock stratum | |
| CN111460666A (en) | Rock burst danger prediction method for typical rock burst mine | |
| Pengfei et al. | Research on fault activation law in deep mining face and mechanism of rockburst induced by fault activation | |
| Meng et al. | In situ investigation and numerical simulation of the failure depth of an inclined coal seam floor: a case study | |
| Trigueros et al. | A methodology based on geomechanical and geophysical techniques to avoid ornamental stone damage caused by blast-induced ground vibrations | |
| Xiao et al. | A preliminary study on the design method for large-diameter deep-hole presplit blasting and its vibration-isolation effect | |
| CN114547906A (en) | Well wall stable logging interpretation method for stratum with deep weak structural surface | |
| CN115392061A (en) | Method for evaluating static and dynamic coupling of rock burst danger | |
| Hu et al. | Study on evolution characteristics of regenerated roof structure in downward mining of Bifurcated coal seam | |
| CN114033356B (en) | Coal measure stratum ground stress calculation method and device | |
| CN111413734B (en) | Calculation method for testing propagation speed and arrival time of underground vibration wave | |
| CN111255495B (en) | Support model selection method for horizontal sectional mining of steeply inclined extra-thick coal seam | |
| CN115935588A (en) | Stability evaluation method for small-well-spacing twin-well salt cavern gas storage | |
| Yang et al. | Safety evaluation of underground gas pipe under blasting of subway connected aisle: a case study | |
| CN110427688B (en) | Ground stress prediction method based on actual measurement vibration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220104 |
|
| RJ01 | Rejection of invention patent application after publication |