CN109375268A - The system and method for underground cavern rock convergence measure under a kind of evaluation dynamic loading - Google Patents
The system and method for underground cavern rock convergence measure under a kind of evaluation dynamic loading Download PDFInfo
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- CN109375268A CN109375268A CN201811552103.3A CN201811552103A CN109375268A CN 109375268 A CN109375268 A CN 109375268A CN 201811552103 A CN201811552103 A CN 201811552103A CN 109375268 A CN109375268 A CN 109375268A
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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
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
- G01V1/48—Processing data
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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
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
- G01V1/48—Processing data
- G01V1/50—Analysing data
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Abstract
The invention discloses a kind of system and methods of underground cavern rock convergence measure under evaluation dynamic loading, the system includes vialog, sseismograph includes tubular anchor bolt, tubular crash sensor concentric with it is arranged in anchor bolt, anchor bolt top is fixed with correction adjusting apparatus, the top of crash sensor is fixed on correction adjusting apparatus lower end surface, correction adjusting apparatus lower end surface is fixed with the cycloid being overlapped with the axial line of crash sensor, cycloid end is fixed with swing ball, and crash sensor is connected to computer by data transmission fiber；The anchor bolt of sseismograph is axially fixed to the borehole wall of silo bottom, several DAS are installed at equal intervals on data transmission fiber and survey shake fibre optical sensor, and Multiphysics COMSOL software is installed in a computer；The present invention is based on the tests of dynamic load coefficient, the solution of theoretical calculation and three-dimensional finite element MS software, have scientific and reliability, different dynamic loads finally can intuitively, be quantitatively visualized in Three-dimensional CAD to the damage and failure influence degree of underground cavern.
Description
Technical field
The present invention relates to underground water seal cave depot earthquake monitoring field, underground cavern under especially a kind of evaluation dynamic loading
The system and method for rock convergence measure.
Background technique
Tunnel/tunnel surrounding safety evaluatio is still rock mechanics and underground engineering difficulty urgently to be resolved under dynamic loading
Topic.The especially earthquake, engineering excavation and the earth's surface construction infection that face of underground water seal oil gas cave depot, understands and grasp underground in real time
Cave depot stability plays a significant role its safe operation of guarantee.Currently, the country has delivered and published, " underground structure antidetonation is set
Meter standard " (Tsinghua University take the lead, Zhang Jianmin academician), but mainly for Urban Underground earthquake-resistant structure problem.It is French to have phase at present
The underground oil and gas cave depot earthquake resistant level of pass, but its design and construction has very big difference with China, and French underground cavern major design exists
Near surface, therefore the underground cavern aseismic criterion standard of France is not suitable for the most of cave depot actual conditions in China.
There are difference, most typical feature is ground for underground water seal oil gas cave depot and railway or vcehicular tunnel, diversion tunnel
Lower cave depot sealing can not learn its internal country rock situation after the completion of construction.China is directed to the monitoring of underground oil and gas cave depot at present, mainly
Using traditional technical monitoring means in such a way that micro seismic monitoring combines, the overwhelming majority only rest on judge underground cavern by
The influence of much degree vibrations, various monitoring technology are by inverting, counter push away come the indirect drawing for judging cave depot and being likely to occur
Extent of the destruction is split, lacks the method that can intuitively, quantitatively reflect underground cavern country rock situation, underground cavern place is difficult to keep away in addition
The meeting exempted from encounters the complicated dynamic loads such as earthquake, engineering excavation and earth's surface construction and influences, and evaluates and judge underground cavern state of surrounding rock
As the technical problem for needing to break through.Meanwhile underground water seal cave depot is influenced by dynamic loading, it may occur that situation have:
The problems such as water seal failure, oil leak and partial collapse, seriously restrict safe and stable operation.
The existing appraisal procedure for underground water seal oil gas Surrounding Rock Stability of Underground Cavity, main includes three kinds: first is that passing through
Whether cracking is occurred to water curtain lane supplementing water pressure and rate of water make-up assessment cave depot country rock, is collapsed, this method reliability is low, it is straight to be difficult to
It sees ground and reflects true cave depot country rock situation；Second is that then being obtained by drilling observation method by orienting construction drill in earth's surface
Situation near cave depot country rock, difficulty of construction is big for the method, technical costs is high, and obtaining cave depot country rock information has limitation；Third is that
Microseismic monitoring system is established in underground cavern, reflects that the stability of cave depot, the method are current both at home and abroad by micro seismic monitoring data
In fields such as mining, petroleum and earthquake resistance of a dam, application is mature, but applications in various fields lacks unified standard, including public
Open which type of number of patent application CN 107861157A " a kind of underground water seal cave depot operation phase micro seismic monitoring method " also do not refer to
Under the conditions of underground water seal cave depot be safe.Therefore, cave depot country rock how scientifically, is reasonably evaluated by Microseismic monitoring system
Stability, become technical problem urgently to be resolved.
Summary of the invention
The invention aims to be directed to existing underground cavern STABILITY MONITORING problem, lack scientific and reasonable analysis side
Method and evaluation criterion provide a kind of system and method for evaluating underground cavern rock convergence measure under dynamic loading.
In order to achieve the above objectives, the present invention is implemented according to following technical scheme:
The first purpose of this invention is to provide a kind of system for evaluating underground cavern rock convergence measure under dynamic loading,
Including sseismograph, which includes the tubular anchor bolt for being mounted on shaft wall, is arranged with cylinder concentric with it in anchor bolt
Shape crash sensor, anchor bolt top are fixed with correction adjusting apparatus, and the top of crash sensor is fixed on correction adjusting apparatus lower end surface,
The correction adjusting apparatus lower end surface is fixed with the cycloid being overlapped with the axial line of crash sensor, and cycloid end is fixed with swing ball,
The crash sensor is connected to by data transmission fiber for swinging degree acquisition according to swing ball and dynamic load being calculated
The computer of coefficient.
As the further improvement to technical solution of the present invention, the anchor bolt is made of inoxidizability resin.
Second object of the present invention is to provide a kind of method for evaluating underground cavern rock convergence measure under dynamic loading,
Use the system of underground cavern rock convergence measure under above-mentioned evaluation dynamic loading, comprising the following steps:
Step 1: the anchor bolt of sseismograph to be axially fixed to the borehole wall of silo bottom, data transmission fiber is close to vertical shaft well
Wall is extended to outside vertical shaft and is connect with computer, and is being equipped with several DAS at equal intervals on the data transmission fiber being located in vertical shaft
Shake fibre optical sensor is surveyed, and Multiphysics COMSOL software is installed in a computer；
Step 2: the dynamic load that the stress wave transmitting generated when the ground where vertical shaft is shaken generates influences, draw
The swing ball for playing cycloid traction is swung, and triggering swing ball collides crash sensor, and dynamic load coefficient is calculated in computer, tool
Body calculating process are as follows: the stress value F that crash sensor obtains is calculated according to Newton interpolation algorithm formula F=ma
The acceleration of swing ball designs seismic acceleration peak value 0.2g's about underground cavern according in " seismic design of underground structures standard "
Standard determines the maximum value of the dynamic load coefficient of conductivity；
Step 3: being surveyed by DAS micro- in shake fibre optical sensor acquisition earthquake, engineering excavation and earth's surface construction time section
Event argument, including shear-wave velocity v, shearing wave particle peak velocity speed ppv and acceleration ppa are shaken, then substitutes into data
Calculation formula Δ σmaxThe dynamic load boundary of three-dimensional finite element model is calculated according to this by=± 4vppv；
Step 4: the 3-D geometric model of underground cavern is imported into the Multiphysics COMSOL software in computer,
Using Solid Mechanics module dynamic load is solved to damage several times, uses partial differential program solution cave depot rockmass damage zone and damage
Crackle.
DAS as the further improvement to technical solution of the present invention, on the data transmission fiber positioned in vertical shaft
The spacing surveyed between shake fibre optical sensor is 0.5m.
As the further improvement to technical solution of the present invention, the step 4 is specifically included: in Multiphysics
6 global variable f are set in COMSOL software platformt0、fc0、E0、μ、And n；Then, according to maximum tension stress criterion F1=-
σ3-σt0And Mohr-Column criterionBy stress state function F1With F2Introduce damage
In variable, damaging parameter D and F are defined1、F2Function of state relationship such as following formula:
Secondly, defining local variable:
Straint0=ft0/E0 and strainc0=fc0/E0,
It is maximum to be respectively as follows: with minimum principal strain
Pstr1=max (max (- solid.sp1 ,-solid.sp2) ,-solid.sp3), pstr3=min (min (-
Solid.sp1 ,-solid.sp2) ,-solid.sp3),
Stress state function F1And F2It is respectively as follows:
F1=-pstr3-ft0 and F2=pstr1-pstr3* (1+sin (phi))/(1-sin (phi))-fc0
Therefore damage variable is defined:
D1=0* (F1<0) * (F2<0)+(1- (abs (straint0/strain3)) ^2) * (F1>=0)+(1-abs
(strainc0/strain1)) ^2* (F1<0) * (F2>=0),
It is solved in Multiphysics COMSOL software using the 2nd damage of Solid Mechanics module, linear elastic materials
Elasticity modulus initial value E1=E0* (1-D1)+E0/1e10, the variable and elasticity modulus of different injury stages and so on, finally
It carries out stable state to solve step by step, i.e., shows to visual rationing different dynamic loads to the damage and failure degree of underground cavern.
Compared with prior art, the sseismograph that the present invention designs, structure is simple, and installation is simple, convenient and fast, can directly survey
Examination obtains live load loading system, is conveniently used for the calculating of theoretical formula；In turn, the present invention is based on the tests of dynamic load coefficient, theoretical meter
It calculates and the solution of three-dimensional finite element MS software finally can be intuitive, quantitative in Three-dimensional CAD with scientific and reliability
Ground visualizes different dynamic loads to the damage and failure influence degree of underground cavern.
Detailed description of the invention
Fig. 1 is the sectional view of the sseismograph of the embodiment of the present invention.
Fig. 2 is the top view of the sseismograph of the embodiment of the present invention.
Fig. 3 is that installation when sseismograph to be used to evaluate underground water seal Surrounding Rock Stability of Underground Cavity of the embodiment of the present invention is illustrated
Figure.
Fig. 4 be the embodiment of the present invention a kind of evaluation dynamic loading under underground cavern rock convergence measure method process
Figure.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, right below in conjunction with attached drawing and embodiment
The present invention is described in further detail.Described herein the specific embodiments are only for explaining the present invention, is not used to limit
Fixed invention.
As shown in Figure 1 and Figure 2, under a kind of evaluation dynamic loading of the present embodiment underground cavern rock convergence measure system, packet
Sseismograph is included, which includes the tubular anchor bolt 5 for being mounted on shaft wall, and anchor bolt is preferentially selected excellent with stable antioxygen
The property changed resin is made, and tubular crash sensor 3 concentric with it is arranged in anchor bolt 5,5 top of anchor bolt is fixed with correction adjusting apparatus
4, the top of crash sensor 3 is fixed on correction 4 lower end surface of adjusting apparatus, and 4 lower end surface of correction adjusting apparatus is fixed with and collides
The cycloid 1 that the axial line of sensor 3 is overlapped, 1 end of cycloid are fixed with swing ball 2, and the crash sensor 3 transmits light by data
Fibre is connected to for swinging degree acquisition according to swing ball and the computer of dynamic load coefficient being calculated.The sseismograph of the present embodiment
It is mainly used to survey dynamic load coefficient, principle is that the stress wave transmitting generated when the ground where vertical shaft is shaken generates
Dynamic load influences, and the swing ball 2 for causing cycloid 1 to draw is swung, and triggers swing ball 2 and collides crash sensor 3, computer according to
Determination obtains dynamic load coefficient, specific calculating process to the 2 swing degree of swing ball of acquisition in turn are as follows: what crash sensor 3 obtained answers
Acceleration (the m/s of swing ball 2 can be calculated according to Newton interpolation algorithm formula F=ma in force value F2), according to " underground
Seismic design of structures standard " in standard about underground cavern design seismic acceleration peak value 0.2g, therefore define and work as F/10=
When 0.2, determine that the dynamic load coefficient of conductivity is up to 4.
Referring to Fig. 3, Fig. 4, as another embodiment of the invention, underground cavern country rock under a kind of evaluation dynamic loading
The method of damage uses above-mentioned sseismograph, comprising the following steps:
Step 1: the anchor bolt 5 of sseismograph is axially fixed on the borehole wall of 7 bottom of vertical shaft (such as with rivet), as shown in Fig. 2,
This process does not influence vertical shaft and takes out the operation of trapped fuel gas, 6 top of water seal cave depot located underground of vertical shaft 7, the water located underground of water curtain tunnel 11
6 top of cave depot is sealed, abutting 7 borehole wall of vertical shaft of data transmission fiber 8 extends to outside vertical shaft 7 to be connect with computer 9, and is being located at vertical shaft
One DAS is installed every 0.5m on data transmission fiber in 7 and surveys shake fibre optical sensor 10, DAS surveys shake fibre optical sensor 10 and selects
With the high sensitive sensor of KB12 (VB) model, sensitivity (± 10%) 10000mV/g, range ± 0.6g, and in the computer 9
Multiphysics COMSOL software is installed；
Step 2: the dynamic load that the stress wave transmitting generated when the ground where vertical shaft 7 is shaken generates influences, draw
It plays the swing ball 2 that cycloid 1 is drawn to swing, triggering swing ball 2 collides crash sensor 3, and dynamic load system is calculated in computer 9
Number, specific calculating process are as follows: the stress value F that crash sensor 3 obtains can according to Newton interpolation algorithm formula F=ma
Acceleration (the m/s of swing ball 2 is calculated2), earthquake is designed about underground cavern according in " seismic design of underground structures standard "
The standard of acceleration peak value 0.2g, therefore define as F/10=0.2, determine that the dynamic load coefficient of conductivity is up to 4；
It is obtained in earthquake, engineering excavation and earth's surface construction time section Step 3: surveying shake fibre optical sensor 10 by DAS
Microseismic event parameter, including shear-wave velocity v, shearing wave particle peak velocity speed ppv and acceleration ppa, then by data generation
Enter calculation formula Δ σmaxThe dynamic load boundary of three-dimensional finite element model is calculated according to this by=± 4vppv；
Step 4: the 3-D geometric model of underground cavern is imported the Multiphysics COMSOL (MC) in computer 9
Dynamic load is solved damage using Solid Mechanics module by software several times, uses partial differential program solution cave depot rockmass damage zone
With crack damage.Detailed step is such as: firstly, 6 global variable f are arranged in MC software platformt0、fc0、E0、μ、And n；So
Afterwards, according to maximum tension stress criterion F1=-σ3-σt0And Mohr-Column criterionIt will
Stress state function F1With F2It is introduced into damage variable, defines damaging parameter D and F1、F2Function of state relationship such as following formula:
Secondly, defining local variable:
Straint0=ft0/E0 and strainc0=fc0/E0,
It is maximum to be respectively as follows: with minimum principal strain
Pstr1=max (max (- solid.sp1 ,-solid.sp2) ,-solid.sp3), pstr3=min (min (-
Solid.sp1 ,-solid.sp2) ,-solid.sp3),
Stress state function F1And F2It is respectively as follows:
F1=-pstr3-ft0 and F2=pstr1-pstr3* (1+sin (phi))/(1-sin (phi))-fc0
Therefore damage variable is defined
D1=0* (F1<0) * (F2<0)+(1- (abs (straint0/strain3)) ^2) * (F1>=0)+(1-abs
(strainc0/strain1)) ^2* (F1<0) * (F2>=0)
It is worth noting that being solved in MC software using the 2nd damage of Solid Mechanics module, the elasticity of linear elastic materials
Modulus initial value E1=E0* (1-D1)+E0/1e10, the variable and elasticity modulus of different injury stages and so on, it is final to carry out
Stable state solves step by step, can show to visual rationing different dynamic loads to the damage and failure degree of underground cavern.
Based on the above method, technical staff is the concrete condition of evaluable underground cavern country rock, and determines whether to be repaired
It is multiple.
The limitation that technical solution of the present invention is not limited to the above specific embodiments, it is all to do according to the technique and scheme of the present invention
Technology deformation out, falls within the scope of protection of the present invention.
Claims (5)
1. the system of underground cavern rock convergence measure under a kind of evaluation dynamic loading, which is characterized in that including vialog, the survey
Vibration Meter includes the tubular anchor bolt for being mounted on shaft wall, and tubular crash sensor concentric with it, anchor are arranged in anchor bolt
Bolt top is fixed with correction adjusting apparatus, and the top of crash sensor is fixed on correction adjusting apparatus lower end surface, the correction adjusting apparatus
Lower end surface is fixed with the cycloid being overlapped with the axial line of crash sensor, and cycloid end is fixed with swing ball, the crash sensor
It is connected to by data transmission fiber for swinging degree acquisition according to swing ball and the computer of dynamic load coefficient being calculated.
2. the system of underground cavern rock convergence measure under evaluation dynamic loading according to claim 1, it is characterised in that: institute
Anchor bolt is stated to be made of inoxidizability resin.
3. the method for underground cavern rock convergence measure, uses evaluation as claimed in claim 1 or 2 under a kind of evaluation dynamic loading
The system of underground cavern rock convergence measure under dynamic loading, comprising the following steps:
Step 1: the anchor bolt of sseismograph to be axially fixed to the borehole wall of silo bottom, data transmission fiber is close to shaft wall and is prolonged
It extends to and is connect outside vertical shaft with computer, and on the data transmission fiber being located in vertical shaft several DAS are being installed at equal intervals and are surveying shake
Fibre optical sensor, and Multiphysics COMSOL software is installed in a computer；
Step 2: the dynamic load that the stress wave transmitting generated when the ground where vertical shaft is shaken generates influences, cause to put
The swing ball of line traction is swung, and triggering swing ball collides crash sensor, and dynamic load coefficient is calculated in computer, specific to count
Calculation process are as follows: swing ball is calculated according to Newton interpolation algorithm formula F=ma in the stress value F that crash sensor obtains
Acceleration, according in " seismic design of underground structures standard " about underground cavern design seismic acceleration peak value 0.2g standard
Determine the maximum value of the dynamic load coefficient of conductivity；
Step 3: surveying the microseism thing in shake fibre optical sensor acquisition earthquake, engineering excavation and earth's surface construction time section by DAS
Then data are substituted into and are calculated by part parameter, including shear-wave velocity v, shearing wave particle peak velocity speed ppv and acceleration ppa
Formula Δ σmaxThe dynamic load boundary of three-dimensional finite element model is calculated according to this by=± 4vppv；
Step 4: the 3-D geometric model of underground cavern is imported the Multiphysics COMSOL software in computer, use
Dynamic load is solved damage by Solid Mechanics module several times, is split using partial differential program solution cave depot rockmass damage zone with damage
Line.
4. the method for underground cavern rock convergence measure under evaluation dynamic loading according to claim 3, it is characterised in that: institute
Rheme is 0.5m in the spacing that the DAS on the data transmission fiber in vertical shaft is surveyed between shake fibre optical sensor.
5. the method for underground cavern rock convergence measure under evaluation dynamic loading according to claim 3, it is characterised in that: institute
It states step 4 to specifically include: 6 global variable f is set in Multiphysics COMSOL software platformt0、fc0、E0、μ、
And n；Then, according to maximum tension stress criterion F1=-σ3-σt0And Mohr-Column criterion By stress state function F1With F2It is introduced into damage variable, defines damaging parameter D and F1、F2Function of state relationship such as following formula:
Secondly, defining local variable:
Straint0=ft0/E0 and strainc0=fc0/E0,
It is maximum to be respectively as follows: with minimum principal strain
Pstr1=max (max (- solid.sp1 ,-solid.sp2) ,-solid.sp3), pstr3=min (min (-
Solid.sp1 ,-solid.sp2) ,-solid.sp3),
Stress state function F1And F2It is respectively as follows:
F1=-pstr3-ft0 and F2=pstr1-pstr3* (1+sin (phi))/(1-sin (phi))-fc0
Therefore damage variable is defined:
D1=0* (F1<0) * (F2<0)+(1- (abs (straint0/strain3)) ^2) * (F1>=0)+(1-abs
(strainc0/strain1)) ^2* (F1<0) * (F2>=0),
It is solved in Multiphysics COMSOL software using the 2nd damage of Solid Mechanics module, the elasticity of linear elastic materials
Modulus initial value E1=E0* (1-D1)+E0/1e10, the variable and elasticity modulus of different injury stages and so on, it is final to carry out
Stable state solves step by step, i.e., shows to visual rationing different dynamic loads to the damage and failure degree of underground cavern.
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2018
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| US20110292763A1 (en) * | 2010-05-26 | 2011-12-01 | Schlumberger Technology Corporation | Detection of seismic signals using fiber optic distributed sensors |
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| CN106383172A (en) * | 2016-10-10 | 2017-02-08 | 三峡大学 | Surrounding rock damage prediction method based on energy release coefficient |
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