CN109001808A - The recognition methods of the potential seepage channel of underground formula powerhouse of hydropower station based on micro seismic monitoring - Google Patents
The recognition methods of the potential seepage channel of underground formula powerhouse of hydropower station based on micro seismic monitoring Download PDFInfo
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- CN109001808A CN109001808A CN201810799280.5A CN201810799280A CN109001808A CN 109001808 A CN109001808 A CN 109001808A CN 201810799280 A CN201810799280 A CN 201810799280A CN 109001808 A CN109001808 A CN 109001808A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/30—Analysis
- G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/64—Geostructures, e.g. in 3D data cubes
- G01V2210/642—Faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/64—Geostructures, e.g. in 3D data cubes
- G01V2210/646—Fractures
Abstract
The latent seepage channel recognition methods of the underground formula powerhouse of hydropower station based on micro seismic monitoring that the present invention provides a kind of, steps are as follows: 1. delineation monitoring region, placement sensor and blast hole；2. carrying out explosion in each blast hole respectively in different time points, the take-off moment for the elastic wave that each separate explosion generates is recorded, calculates rock mass average equivalent velocity of wave；3. being monitored by Microseismic monitoring system to monitoring region, moment occurs for the hypocentral location for the microseismic event that measurement monitoring region generates and microseism, make hypocentral location spatial distribution map, when the hypocentral location of microseismic event is when the aggregation of a certain or certain regional area and presentation ribbon or planar for monitoring region are distributed, then i.e. there are potential seepage channels in corresponding regional area.Method of the invention can more accurately identify the potential seepage channel that underground formula powerhouse of hydropower station occurs during construction and operation, be conducive to the Security Construction and safe operation that preferably instruct rock underground formula powerhouse of hydropower station.
Description
Technical field
The invention belongs to geotechnical engineering fields, and it is potential to be related to a kind of underground formula powerhouse of hydropower station based on micro seismic monitoring
The recognition methods of seepage channel.
Background technique
Many large hydropower stations are all disposed in high mountain gorge, and ground space is limited, effectively utilize the underground space not only
It can solve project playout problem, head difference can also be made full use of to improve water power calculation efficiency.China is at present in the double rivers built
Saliva power station, white crane beach power station, two river mouth power stations and black East Germany power station, Xiangjiabahydropower project, two beaches built up
Power station all uses underground type to arrange, and develops towards the ultra-large types cavern direction such as large span, heavy excavation scale.Due to underground cloth
The reason of setting, the natural water level line that power station multidigit is formed in rainfall is hereinafter, in digging process, and powerhouse of hydropower station country rock is easily
There is Problems of Seepage Flow, threatens engineering safety.Therefore, whether underground formula powerhouse of hydropower station digging process safety, no
It only to solve the problems, such as stability of tunnel, also to accurately identify potential rock seepage flow crack, to build safely power station early period
If stablizing operation with the later period provides good guarantee.
Currently, powerhouse of hydropower station Seepage problems are based on saturation-unsaturated flow theory more, in conjunction with the basic of crack rock
Property establishes main building Physical Experiment model or analytical mathematical models, provides solution for the Seepage problems of workshop.Physics is real
Testing model includes Fracture Networks model, double medium model and porous media model etc., and mathematics computing model is in infiltration in recent years
There has also been rapid progresses in stream calculation development, but these models are based on field geological investigation more and survey for the purpose of locating hydrogeological resources obtains data
As the firsthand information of model, physico-mechanical properties, tomography joint attitude and groundwater occurrence state including rock etc.,
Do not consider that powerhouse of hydropower station excavates the crack to be formed, accuracy need to be improved.Also, underground formula powerhouse of hydropower station is most
Preservation is in certain groundwater environment, and multi-pass crosses drainage hole, draining curtain in underground formula powerhouse of hydropower station digging process
Curtain and seepage proof curtain solve Problems of Seepage Flow in main building, these are gained through experience mostly, and take comprehensive, more
Scale is constructed to solve Seepage problems.It can be seen that if solving ground on the basis of cannot accurately identify rock seepage channel
The Seepage problems of lower arrangement formula powerhouse of hydropower station, it will wasting manpower and material resources, and delay the duration.
Underground formula powerhouse of hydropower station rock mass is preservation under definitely stress condition, in underground formula power station
In the excavation unloading process of workshop, original crustal stress will lead to stresses re-distribution by excavation disturbance, and cause rock mass germinating micro-
Crack and the expansion for causing initial fissure.The development expansion of initial fissure not only results in wall rock destabilization, the crack of perforation
The potential seepage channel of underground water will be become.Therefore, underground formula powerhouse of hydropower station rock mass excavate unloading process in
And during the subsequent operation in power station, the expansion of initial fissure and the development germinating of microfissure are accurately identified, and then accurately
The potential seepage channel for identifying underground formula powerhouse of hydropower station, for solving underground formula powerhouse of hydropower station Seepage problems,
The operation of stablizing of the Security Construction and later period that ensure underground formula powerhouse of hydropower station will all generate important meaning.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of underground formula water based on micro seismic monitoring
Power Plant is dived seepage channel recognition methods, with more acurrate and efficiently identify underground formula powerhouse of hydropower station and building and transporting
The potential seepage channel occurred during battalion provides foundation to solve underground formula powerhouse of hydropower station stability problem, thus
Preferably instruct the Security Construction and safe operation of rock underground formula powerhouse of hydropower station.
Underground formula powerhouse of hydropower station provided by the invention based on micro seismic monitoring is dived seepage channel recognition methods, step
It is as follows:
1. drawing a circle to approve the powerhouse of hydropower station region rock mass of pending potential seepage channel identification as monitoring region, microseism is supervised
The sensor of examining system is mounted on the rock mass in monitoring region, and sensor is at least 4, and each sensor antarafacial is installed on different height
Each sensor is connected, then by the host of the Acquisition Instrument and Microseismic monitoring system by journey with the Acquisition Instrument of Microseismic monitoring system
Part connects；Three-dimensional cartesian coordinate system is established, the coordinate of each sensor is measured, the coordinate of i-th of sensor is denoted as (xi,yi,
zi)；At least one blast hole is set on the rock mass in tunnel, measures the coordinate at each blast hole bottom hole center, it is quick-fried by j-th
Coordinate at holes bottom hole center is denoted as (Xj,Yj,Zj)；
2. the bottom hole in each blast hole installs explosive, onepull is carried out in each blast hole respectively in different time points,
At the take-off moment that the elastic wave that each separate explosion generates is recorded by sensor, the blowing-up time of j-th of blast hole is denoted as tj, will
The take-off moment that i-th of sensor receives the elastic wave of explosion generation after j-th of blast hole explosion is denoted as tji；
According to the distance between j-th of blast hole and each sensor and the relationship of speed and time, correspond to each
Blast hole lists following equation (1-1)~(1-i) according to two o'clock range formula, and the i in 1-i refers to the total of sensor herein
Number:
…
Respectively by the 1,2nd ..., the coordinate of j blast hole, the blowing-up time of corresponding blast hole explosion and corresponding
The value that i-th of sensor receives the take-off moment of the elastic wave of explosion generation after blast hole explosion substitutes into formula (1-1)~(1-i)
One of, the equivalent velocity of wave of rock mass can be solved respectively, be denoted as v1,v2,…,vj, it so presses and calculates rock mass average equivalent velocity of wave v,
3. being monitored by Microseismic monitoring system to monitoring region, the focus for the microseismic event that measurement monitoring region generates
Moment occurs for position and microseism, and hypocentral location is simultaneously shown in by the hypocentral location for the microseismic event that real-time statistics monitoring region occurs
In three-dimensional cartesian coordinate system, hypocentral location spatial distribution map is obtained, when the hypocentral location of microseismic event is in a certain of monitoring region
Or the aggregation of certain regional areas and it is presented ribbon or when planar is distributed, then it is logical that i.e. there are potential seepage flow in corresponding regional area
Road；If the hypocentral location of microseismic event does not occur clustering phenomena in a certain or certain discrete distribution of regional area in monitoring region,
Then illustrate in corresponding regional area without potential seepage channel；
It is as follows that the method at moment occurs for the hypocentral location for the microseismic event that measurement monitoring region generates and microseism:
Assuming that the coordinate of the focus of microseismic event is (Xk, Yk, Zk), it is t at the time of microseism occursk, define tkiIt is i-th
Sensor receives the take-off moment of the elastic wave of microseismic event generation, according between the focus of microseismic event and each sensor
The relationship of distance and speed and time lists following equation (2-1)~(2-i) according to two o'clock range formula, herein 2-i
In i refer to the sum of sensor:
…
At least four equation in joint type (2-1)~(2-i) substitutes into the seat of rock mass average equivalent velocity of wave v, each sensor
Mark and each sensor receive the value at the take-off moment of the elastic wave of microseismic event generation, can solve the shake of microseismic event
Coordinate (the X in sourcek, Yk, Zk) and microseism occur at the time of tk。
In the technical solution of the latent seepage channel recognition methods of the above-mentioned underground formula powerhouse of hydropower station based on micro seismic monitoring,
ESG Microseismic monitoring system can be used in the Microseismic monitoring system, and other Microseismic monitoring systems can also be used.
In the technical solution of the latent seepage channel recognition methods of the above-mentioned underground formula powerhouse of hydropower station based on micro seismic monitoring,
Be arranged 1 blast hole, carry out onepull can measure and be calculated the equivalent velocity of wave of rock mass, in order to increase the equivalent velocity of wave of rock mass
The accuracy of calculating, it is preferred to use more than one blast hole, it is highly preferred that the quantity of blast hole is 2~5.
In the technical solution of the latent seepage channel recognition methods of the above-mentioned underground formula powerhouse of hydropower station based on micro seismic monitoring,
Stop construction when explosion in order to avoid the acquisition of elastic wave signal that interference sensor generates explosion, in the bullet for completing to generate explosion
Property wave signal acquisition after, restore normal construction.
Underground formula powerhouse of hydropower station provided by the invention based on micro seismic monitoring is dived seepage channel recognition methods, is utilized
On Microseismic Monitoring Technique come obtain it is micro- monitoring region in shake event hypocentral location aggregation situation, according to microseismic event focus position
The aggregation situation set judges to monitor the developmental state of microfissure in rock mass in region: if hypocentral location is in a certain of monitoring region
Or certain regional area aggregations, show crack extensive development in these regional areas；When hypocentral location is in a certain of monitoring region
Or certain regional areas are assembled and are presented ribbon or when planar is distributed, then show the crack in corresponding regional area in band
Shape or planar are developed, i.e., i.e. there are potential seepage channels in corresponding regional area, if the regional area preservation is in underground water
In, in other words if there are water cavity in the regional area, the crack of extensive development can be used as the potential seepage channel of underground water, that
The regional area is exactly a potential unstability region, in the construction process either during the operation of power station, is needed in time
It takes measures to protect the potential unstability region, to ensure construction safety and underground formula powerhouse of hydropower station operation peace
Entirely.
Compared with prior art, the invention has the following advantages:
1. the underground formula powerhouse of hydropower station potential seepage channel recognition methods provided by the invention based on micro seismic monitoring,
This method obtains the aggregation situation of the hypocentral location of microseismic event, and the aggregation according to hypocentral location using On Microseismic Monitoring Technique
The developmental state of microfissure in rock mass of the situation to judge to monitor region, and then identify underground formula powerhouse of hydropower station region rock
Potential seepage channel in body.It solves existing physics and mathematical model calculation method is difficult to accurately identify underground formula water power
Stand workshop potential seepage channel the problem of, compared with existing physics and mathematical model calculation method, method of the invention has
Advanced prediction and convenience can accurately and effectively identify potential seepage channel, to preferably instruct and ensure underground
The construction safety and operation security of formula powerhouse of hydropower station.
2. method provided by the invention is non-destructive monitoring method in a kind of spatial dimension, especially can real-time monitoring on ground
The expansion of rock micro rupture and initial fissure as caused by construction disturbance in lower arrangement formula powerhouse of hydropower station work progress, in turn
Judge whether micro rupture aggregation or the expansion of primary joint crack can form potential seepage channel, it also can real-time monitoring underground formula
Powerhouse of hydropower station is to produce potential seepage channel during operation.
Detailed description of the invention
Fig. 1 is the schematic diagram that the present invention identifies the potential seepage channel of underground formula powerhouse of hydropower station.
Fig. 2 is the sensor arrangement figure in the monitoring region of embodiment, and in figure, S1, S2, S3, S4, S5, S6 are sensor
Number.
Fig. 3 is ESG Microseismic monitoring system network topological diagram in embodiment.
Fig. 4 is the hypocentral location spatial distribution map made in embodiment, wherein (A) figure is top view, (B) figure is side view
Figure, the partial enlarged view that (C) is (B) figure.
Specific embodiment
Below by specific embodiment and in conjunction with attached drawing to the underground formula water of the present invention based on micro seismic monitoring
The potential seepage channel recognition methods of Power Plant is described further.It is important to point out that following embodiment is served only for this
Invention is described further, and should not be understood as limiting the scope of the invention, those skilled in the art is according to above-mentioned
Summary of the invention is made some nonessential modifications and adaptations to the present invention and is embodied, still falls within protection model of the invention
It encloses.
Embodiment 1
The present embodiment is illustrated and is based on by taking the excavation construction process of certain Large Underground arrangement formula power station main building as an example
The potential seepage channel recognition methods of underground formula powerhouse of hydropower station of micro seismic monitoring, the present invention is to underground formula Hydroelectric Plant
The schematic diagram that the potential seepage channel in room is identified is shown in Fig. 1.
The Microseismic monitoring system used in the present embodiment is ESG Microseismic monitoring system (Canadian ESG company), ESG microseism
Monitoring system mainly includes acceleration transducer, Paladin digital signal acquiring system (i.e. Acquisition Instrument) and Hyperion number
Signal processing system (i.e. the host machine part of ESG Microseismic monitoring system).The network topological diagram of ESG Microseismic monitoring system such as Fig. 3 institute
Show, each acceleration transducer is connect by cable with Paladin digital signal acquiring system, Paladin digital signal acquiring
System connect by cable with Hyperion digital information processing system, Hyperion digital information processing system pass through network and
Analysis center is calculated with Chengdu by network after the connection of two river mouth campsite offices to connect.The sensitivity of the sensor is 30V/
The sample frequency of g, frequency response range 50Hz~5kHz, Paladin digital signal acquiring system are 20kHz, and sensor will connect
The stress wave received is changed into electric signal, and is stored in after being converted to digital signal by Paladin digital signal acquiring system
In Hyperion digital information processing system.In the present embodiment, the take-off moment of the elastic wave of sensor acquisition is rising for P wave
Jump the moment.
Specific step is as follows for the present embodiment:
1. drawing a circle to approve large hydropower station main building upstream abutment wall about 200m × 200m × 200m (respectively along water flow side
To, three directions of Transverse to the flow direction and vertical direction) region as monitoring region, by the sensing of ESG Microseismic monitoring system
Device, which is mounted in the main building upstream row water hole and tonifying Qi hole in monitoring region, installs 6 sensors, be S1 by each sensor number,
S2, S3, S4, S4, S6, each number correspond respectively to the 1st, the 2nd, the 3rd, the 4th, the 5th, the 6th sensor.It is each to pass
The elevation of sensor is different and forms space net structure difference, and the arrangement of sensor avoids any three sensors positioned at same
On straight line, any four sensor it is in the same plane, sensor covering include scupper and tonifying Qi hole main building upstream
Abutment wall country rock, as shown in Figure 2.Each sensor is connected with the Acquisition Instrument of Microseismic monitoring system, then by the Acquisition Instrument with it is micro-
Shake the host machine part connection of monitoring system.
Using First machine nest along water (flow) direction as the positive direction of x-axis, with the intersection point of First machine nest Transverse to the flow direction
For 1100 coordinate points of y-axis, using First machine nest to second, the direction of third platform machine nest as positive direction of the y-axis, with absolute elevation
For z-axis positive direction as coordinate basis, establish three-dimensional cartesian coordinate system, measure the coordinate of each sensor, by i-th of sensor
Coordinate be denoted as (xi,yi,zi), i=1,2,3 ..., 6；2 blast holes are set on the abutment wall of main building upstream, measure each explosion
Coordinate at j-th of blast hole bottom hole center is denoted as (X by the coordinate at the bottom hole center of holej,Yj,Zj), j=1,2.Measure each biography
Coordinate at the coordinate of sensor and each blast hole bottom hole center, is recorded in Tables 1 and 2 respectively.
The coordinate of each sensor of table 1
Coordinate at 2 each blast hole bottom hole center of table
| Blast hole | Easting(X)/m | Northing(Y)/m | Depth(Z)/m |
| 1 | -3.00 | 92.35 | 0.58 |
| 2 | 4.50 | 92.35 | 4.23 |
2. the bottom hole in each blast hole installs emulsion, det-cord and high-pressure electrostatic initiator are connected, by each blast hole
The loose grogs in aperture scene block to reduce energy loss when explosion.Respectively in the 1st blast hole to the 2nd explosion
Onepull, two separate explosion intervals 4 days, when recording the take-off for the elastic wave that each separate explosion generates by sensor are carried out in hole
It carves, the blowing-up time of j-th of blast hole is denoted as tj, i-th of sensor after j-th of blast hole explosion is received into explosion and is generated
Take-off moment of elastic wave be denoted as tji；Stop excavation construction when explosion in order to avoid sensor is interfered to believe the elastic wave that explosion generates
Number acquisition restore normal excavation construction after the acquisition of elastic wave signal for completing to generate explosion.
According to the distance between j-th of blast hole and each sensor and the relationship of speed and time, correspond to each
Blast hole lists equation (1-1) according to two o'clock range formula:
Respectively by the coordinate of the 1st blast hole and the 2nd blast hole, corresponding blast hole explosion blowing-up time and
The value that i-th of sensor receives the take-off moment of the elastic wave of explosion generation after corresponding blast hole explosion substitutes into formula (1-1),
The equivalent velocity of wave v of rock mass is solved respectively1=4028m/s, v2Then=4034m/s calculates rock mass average equivalent velocity of wave v,
3. being monitored by ESG Microseismic monitoring system to monitoring region, measurement monitoring in powerhouse of hydropower station construction period
Moment occurs for the hypocentral location for the microseismic event that region generates and microseism.The focus position for the microseismic event that measurement monitoring region generates
It sets and the method at microseism generation moment is as follows:
Assuming that the coordinate of the focus of microseismic event is (Xk, Yk, Zk), it is t at the time of microseism occursk, define tkiIt is i-th
Sensor receives the take-off moment of the elastic wave of microseismic event generation, according between the focus of microseismic event and each sensor
The relationship of distance and speed and time lists following 6 equations according to two o'clock range formula:
Above-mentioned 6 equations of simultaneous substitute into rock mass average equivalent velocity of wave v, the coordinate of each sensor and each sensor and receive
The value at the take-off moment of the elastic wave generated to microseismic event, can solve the coordinate (X of the focus of microseismic eventk, Yk, Zk)
T at the time of generation with microseismk。
During micro seismic monitoring, real-time statistics monitor the hypocentral location for the microseismic event that region occurs, in real time by focus position
It sets and is shown in three-dimensional cartesian coordinate system, obtain hypocentral location spatial distribution map, shaken in the spatial distribution map in conjunction with hypocentral location
The distribution situation of source position is judged that a certain or certain regional area in monitoring region is poly- when the hypocentral location of microseismic event
When collection and presentation ribbon or planar are distributed, then i.e. there are potential seepage channels in corresponding regional area；If microseismic event
Hypocentral location does not occur clustering phenomena, then illustrates corresponding office in a certain or certain discrete distribution of regional area in monitoring region
Without the structural planes such as controlling tomography are verified in portion region, i.e., exist in corresponding regional area without potential seepage channel.
In the monitoring process of the present embodiment, after monitoring 45 days, occur 221 microseismic events, the microseism made altogether
The spatial distribution map of position event, as shown in figure 4, as shown in Figure 4, there is the hypocentral location of microseismic event in main building upstream
A regional area (regional area that dotted line outlines in (C) figure of Fig. 4) aggregation and present ribbon distribution the case where, explanation
There are potential seepage channels in the regional area.Prompt, should be to the partial zones in underground power station main building work progress
Safeguard procedures, such as concrete grouting measure are taken to ensure the construction safety of power station main building in domain.
Claims (3)
- The seepage channel recognition methods 1. the underground formula powerhouse of hydropower station based on micro seismic monitoring is dived, it is characterised in that step is such as Under:1. drawing a circle to approve the powerhouse of hydropower station region rock mass of pending potential seepage channel identification as monitoring region, by micro seismic monitoring system The sensor of system is mounted on the rock mass in monitoring region, and sensor is at least 4, and each sensor antarafacial is installed on different elevations, Each sensor is connected with the Acquisition Instrument of Microseismic monitoring system, then by the host machine part of the Acquisition Instrument and Microseismic monitoring system Connection；Three-dimensional cartesian coordinate system is established, the coordinate of each sensor is measured, the coordinate of i-th of sensor is denoted as (xi,yi,zi)； At least one blast hole is set on the rock mass in tunnel, the coordinate at each blast hole bottom hole center is measured, by j-th of blast hole Coordinate at bottom hole center is denoted as (Xj,Yj,Zj)；2. the bottom hole in each blast hole installs explosive, onepull is carried out in each blast hole respectively in different time points, is passed through Sensor records the take-off moment for the elastic wave that each separate explosion generates, and the blowing-up time of j-th of blast hole is denoted as tj, by jth The take-off moment that i-th of sensor receives the elastic wave of explosion generation after a blast hole explosion is denoted as tji；According to the distance between j-th of blast hole and each sensor and the relationship of speed and time, correspond to each explosion Hole following equation (1-1)~(1-i) is listed according to two o'clock range formula:…Respectively by the 1,2nd ..., the coordinate of j blast hole, the blowing-up time of corresponding blast hole explosion and corresponding explosion After the explosion of hole i-th of sensor receive explosion generation elastic wave the take-off moment value substitute into formula (1-1)~(1-i) it One, the equivalent velocity of wave of rock mass can be solved respectively, be denoted as v1,v2,…,vj, rock mass average equivalent velocity of wave v is then calculated,3. being monitored by Microseismic monitoring system to monitoring region, the hypocentral location for the microseismic event that measurement monitoring region generates And the moment occurs for microseism, hypocentral location is simultaneously shown in three-dimensional by the hypocentral location for the microseismic event that real-time statistics monitoring region occurs In rectangular coordinate system, obtain hypocentral location spatial distribution map, when the hypocentral location of microseismic event monitoring region a certain or certain When a little regional area aggregations and presentation ribbon or planar distribution, then i.e. there are potential seepage channels in corresponding regional area；It is as follows that the method at moment occurs for the hypocentral location for the microseismic event that measurement monitoring region generates and microseism:Assuming that the coordinate of the focus of microseismic event is (Xk, Yk, Zk), it is t at the time of microseism occursk, define tkiIt is sensed for i-th Device receives the take-off moment of the elastic wave of microseismic event generation, according between the focus of microseismic event and each sensor away from From and speed and time relationship, following equation (2-1)~(2-i) is listed according to two o'clock range formula:…At least four equation in joint type (2-1)~(2-i), substitute into rock mass average equivalent velocity of wave v, each sensor coordinate, with And each sensor receives the value at the take-off moment of the elastic wave of microseismic event generation, can solve the seat of the focus of microseismic event Mark (Xk, Yk, Zk) and microseism occur at the time of tk。
- 2. the latent seepage channel recognition methods of the underground formula powerhouse of hydropower station based on micro seismic monitoring according to claim 1, It is characterized in that, the Microseismic monitoring system is ESG Microseismic monitoring system.
- The seepage channel identification side 3. the underground formula powerhouse of hydropower station according to claim 1 or claim 2 based on micro seismic monitoring is dived Method, which is characterized in that the quantity of blast hole is 2~5.
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