CN108038282A - Load transmission method for numerical simulation is exploited under a kind of unconsolidated confined aquifer - Google Patents
Load transmission method for numerical simulation is exploited under a kind of unconsolidated confined aquifer Download PDFInfo
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- CN108038282A CN108038282A CN201711233870.3A CN201711233870A CN108038282A CN 108038282 A CN108038282 A CN 108038282A CN 201711233870 A CN201711233870 A CN 201711233870A CN 108038282 A CN108038282 A CN 108038282A
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Abstract
The invention discloses load transmission method for numerical simulation is exploited under a kind of unconsolidated confined aquifer, the present invention embeds language based on the FISH in Discrete Element software for calculation UDEC4.0 programs, and secondary development is carried out to UDEC4.0.After working face coal seam is excavated, during model calculation, judge that unconsolidated confined aquifer acts on whether the pressure from surrounding rock on the bottom interface of water-bearing layer is less than piezometric head, if so, then applying complementary area power on the bottom interface of water-bearing layer.The present invention passes through FISH sentences, it can realize that artesian aquifer water pressure is uniformly applied on the bottom interface of water-bearing layer, and load is kept constant in digging process, so as to simulate artesian aquifer Stress Transmission, calamity mechanism study is caused to provide method for numerical simulation further to carry out exploitation sand coated iron mold unstability under unconsolidated confined aquifer.
Description
Technical field
The invention belongs to mining engineering numerical simulation technology field, and in particular to exploit and carry under a kind of unconsolidated confined aquifer
Lotus transmits method for numerical simulation.
Background technology
Barrier pillar is reduced, improves upper extraction limit exploitation, the mine first level length of service can be extended, alleviation is taken over tight
, improve coal recovery rate.In recent years, as the continuous improvement of " under three " production technique level, many mines will
Barrier pillar height narrows down to 20~30m by original 80m.But the exploitation of the diminution safety pillar under wa ter bodies of some mines is also paid
Heavy cost, as two Hua Areas mining area improve upper extraction limit exploitation, due to coal rock layer preservation situation, geological structure, coal seam and
The geologic information such as overburden structure feature, Yi Jihan, the physics classroom teaching of water barrier, architectural feature grasps unclear, back production
Period especially in first weighting, periodic weighting and during crossing geologic anomaly area, occur working face " pressure rack ", " pressure rack gushing water " or
" routed sand " accident, forms certain threat to personnel, equipment, constrains the safe working of coal under the conditions of this.
UDEC4.0 discrete element numerical computations instruments are mainly used in ROCK MASS JOINT in subterranean body mining active process, tomography, sink
The influence evaluation to rock mass progressive failure such as product face.UDEC4.0 provides the 7 kinds of material constitutive models and 5 kinds of sections of suitable ground
Constitutive model is managed, can adapt to the needs of the rock movement under the conditions of different lithology and different cutting status, is current simulation rock
The ideal numerical simulation software of motion process after layer is disrumpent feelings.
In numerical simulation, the reasonability of Numerical results depend greatly on model foundation correctness and
The reliability of input parameter.At present, many scholars exploit working face pressure rack under unconsolidated confined aquifer and cause calamity mechanism side
Relevant numerical simulation study has been carried out in face, generally takes under unconsolidated confined aquifer, more than floor undulation (including partial bottom
Plate) rock stratum as analysis object, rock stratum more than artesian aquifer is with Uniform Loads on model.But existing
Numerical simulation study in, do not related to but for the load transmission mechanical characteristic of unconsolidated confined aquifer, this will lead to not
Deeply disclose overlying basement rock-key strata compound breakage under working face mining and unconsolidated confined aquifer coupling and cause calamity mechanism.
Therefore, exploited under unconsolidated confined aquifer in numerical simulation, correct realize of the unconsolidated confined aquifer in numerical simulation is
A vital step.
The content of the invention
It is an object of the invention to make up the deficiencies in the prior art, there is provided load is exploited under a kind of unconsolidated confined aquifer and is passed
Pass method for numerical simulation.
In order to solve the problems existing in background technology, the present invention uses following technical scheme：
Load transmission method for numerical simulation is exploited under a kind of unconsolidated confined aquifer, it comprises the following steps：
(1) numerical simulator is established, sets primary condition；
(2) model initial equilibrium conditions calculating is carried out；
(3) working face is excavated；
(4) judge whether the pressure from surrounding rock acted on artesian aquifer bottom interface is less than piezometric head, if so, then
Apply complementary area power on artesian aquifer bottom interface, simulate artesian aquifer load permanent character；
(5) 500 time step of numerical simulator computing；
(6) whether judgment models computing reaches equilibrium state or sand coated iron mold has occurred and that sliding instability, if so, program is transported
Calculate and terminate, preserved；If not, program returns to step (4).
Further, in step (1), the engineering geological condition is the unconsolidated confined aquifer thin bedrock of we selected typical
Working face condition, numerical simulator is built according to working face log sheet；The setting primary condition comprises the following steps：
1. taking coal petrography sample at the scene, by laboratory test, coal petrography physical and mechanical parameter is obtained；
2. assignment is carried out to numerical model coal rock layer attribute；
3. model boundary condition and primary condition are set according to working face buried depth and stress of primary rock size.
Further, described that working face is excavated in step (3), working face open-off cut is located at the left side of model
40m, direction of propulsion are by left-to-right, since in actual production, working face about promotes 5m daily, therefore in numerical simulation every time
5m is excavated, after model calculation balances, then carries out excavation next time.
Further, in step (4), the simulation artesian aquifer load permanent character, comprises the following steps：
1. travel through artesian aquifer bottom interface pressure from surrounding rock q；
2. judge that unconsolidated confined aquifer acts on whether the pressure from surrounding rock q on artesian aquifer bottom interface is more than water-bearing layer
Water pressure q0；
3. two kinds of processing methods are had according to judging result：
If the pressure from surrounding rock q a. acted on artesian aquifer bottom interface is less than piezometric head q0, then inside is passed through
Stress boundary order applies complementary area power △ q=q on artesian aquifer bottom interface0- q, then into step (5)；
If the pressure from surrounding rock q b. acted on artesian aquifer bottom interface is more than piezometric head q0, then it is directly entered
To step (5).
Further, in step (5), 500 time step of numerical simulator computing, step number can root during concrete operation
It is adjusted according to model calculation speed and test accuracy requirement.
Further, in step (6), the sand coated iron mold has occurred and that sliding instability, is selected in face roof
Select characteristic point to be monitored, when the vertical displacement of characteristic point is more than 1.5m, it is believed that face roof has occurred and that landing is lost
Surely, sequential operation terminates.
Further, in step (6), the sequential operation terminates, and comprises the following steps：
1. extraction model maximal unbalanced force and face roof characteristic point vertical displacement；
2. judge whether maximal unbalanced force is less than setting value or whether the vertical displacement of top plate characteristic point is more than 1.5m；
3. two kinds of processing methods are had according to judging result：
If a. maximal unbalanced force is less than setting value or the vertical displacement of top plate characteristic point is more than 1.5m, sequential operation is whole
Only, preserved；
If b. maximal unbalanced force is more than setting value and the vertical displacement of top plate characteristic point is less than 1.5m, program comes back to
Step (4).
The present invention contrast prior art, there is following beneficial effect：
1. exploiting load transmission method for numerical simulation under unconsolidated confined aquifer of the present invention, can be very good to reproduce
Artesian aquifer Stress Transmission.Model is before each computing, it is necessary to artesian aquifer water pressure size be judged, if acting on
Pressure from surrounding rock on artesian aquifer bottom interface is less than piezometric head, then aqueous in pressure-bearing by the order of internal stress border
Apply complementary area power on layer bottom interface, so that it is permanent to ensure that artesian aquifer acts on the pressure on artesian aquifer bottom interface
It is fixed.
2. exploiting load transmission method for numerical simulation under unconsolidated confined aquifer of the present invention, overlying strata knot can be simulated
The influence of structure, aquifer water pressure, key stratum intensity, working resistance of support and bedrock thickness to key strata compound breakage, is deep
Disclose and sand coated iron mold unstability pressure rack cause calamity mechanism is exploited under artesian aquifer, barrier pillar rationally determines to wait research to provide experiment
Method.
Brief description of the drawings
The attached drawing for being used for illustrating herein is for further explanation of the present invention, is the part of the application,
But the present invention can not be limited.
Fig. 1 is that load transmission method for numerical simulation flow chart is exploited under unconsolidated confined aquifer of the present invention.
Fig. 2 is present example numerical simulator figure.
Fig. 3 is that present example aquifer water pressure is 4.0Mpa sand coated iron mold buckling forms.
Fig. 4 is that present example aquifer water pressure is 4.0Mpa Roof Monitors point subsidence curve.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings：
Fig. 1 is that load transmission method for numerical simulation flow chart is exploited under unconsolidated confined aquifer of the present invention, as shown in Figure 1,
This method comprises the following steps：
(1) according to engineering geological condition, numerical simulator is established, sets primary condition；
(2) model initial equilibrium conditions calculating is carried out；
(3) working face is excavated；
(4) judge whether the pressure from surrounding rock acted on artesian aquifer bottom interface is less than piezometric head, if so, then
Apply complementary area power on artesian aquifer bottom interface, simulate artesian aquifer load permanent character；
(5) 500 time step of numerical simulator computing；
(6) whether judgment models computing reaches equilibrium state or sand coated iron mold has occurred and that sliding instability, if so, program is transported
Calculate and terminate, preserved；If not, program returns to step (4).
Below in conjunction with instantiation, above-mentioned each step is explained.
(1) according to engineering geological condition, numerical simulator is established, sets primary condition；
In present example, using Huainan ore deposit typical case's unconsolidated confined aquifer thin bedrock working face geology condition as the back of the body
Scape, with reference to the working face log sheet, corresponding numerical simulator (Fig. 2) is established by UDEC4.0 softwares.Working face coal
3~7 ° of inclination layer, is flat seam, so being reduced to horizontal seam in numerical simulation.Model long 200m, high 150m.Number
Sillar uses Mohr-Coulomb model in value simulation, and joint plane uses coulomb-sliding model.Conditions setting and primary condition
Comprise the following steps：
1. taking coal petrography sample in working face, by laboratory test, coal petrography physical and mechanical parameter is obtained.
2. assignment (table 1) is carried out to numerical model coal rock layer block mechanical attribute, to numerical model coal rock layer contact traction
Learn attribute and carry out assignment (table 2).
3. model boundary condition and primary condition are set according to working face buried depth and stress of primary rock size.Bury in working face coal seam
Deep 515m.The displacement in model right boundary limit levels direction, lower limits limit the displacement of vertical direction, more than upper bound
Unconsolidated formation be applied to as external applied load 9.75MPa on the coboundary of model.
1 coal rock layer block physical and mechanical parameter of table
2 coal rock layer contact face mechanical parameter of table
(2) model initial equilibrium conditions calculating is carried out；
After model initialization equilibrium state is ready, setting maximal unbalanced force is 2e3N, model in calculating process,
Once maximal unbalanced force is less than this value, then solution procedure terminates.
(3) working face is excavated；
Working face is excavated, working face open-off cut is located at the left side 40m of model, and direction of propulsion is work from left to right
The coal column of 40m is stayed as left side of face；Since in actual production, working face about promotes 5m daily, therefore is opened every time in numerical simulation
5m is dug, after model calculation balances, then excavation next time is carried out, excavates 20 steps, advance of the face 100m altogether.
(4) judge whether the pressure from surrounding rock acted on artesian aquifer bottom interface is less than piezometric head, if so, then
Apply complementary area power on artesian aquifer bottom interface, simulate artesian aquifer load permanent character；
Simulate artesian aquifer load permanent character, including following implementation steps：
1. travel through artesian aquifer bottom interface pressure from surrounding rock q；
2. judge that unconsolidated confined aquifer acts on whether the pressure from surrounding rock q on artesian aquifer bottom interface is more than water-bearing layer
Water pressure q0；Huainan Mining Area coal measures stratum is covered by thickness by Cenozoic's unconsolidated formation of 120~484m, its underpart granule gravel aquifer
Directly contacted with coal measures, cause the exploitation under the conditions of high water head, as Pan one, three colliery artesian aquifer hydraulic pressure of Pan for 2.7~
4.5Mpa；Therefore, in present example, artesian aquifer water pressure q0=4.0Mpa；
3. two kinds of processing methods are had according to judging result：
If the pressure from surrounding rock q a. acted on artesian aquifer bottom interface is less than piezometric head q0, then inside is passed through
Stress boundary order applies complementary area power △ q=q on artesian aquifer bottom interface0- q, then into step (5)；
If the pressure from surrounding rock q b. acted on artesian aquifer bottom interface is more than piezometric head q0, then it is directly entered
To step (5).
(5) 500 time step of numerical simulator computing；
Step number can be adjusted according to model calculation speed and test accuracy requirement during concrete operation.
(6) whether judgment models computing reaches equilibrium state or sand coated iron mold has occurred and that sliding instability (Fig. 3), if so,
Sequential operation terminates, and is preserved；If not, program returns to step (4).
Since in actual production, when face roof deflection is more than 1.5m, bracket upright post is destroked, inevitably results in
Pressure rack accident；Therefore, judge whether sand coated iron mold has occurred and that sliding instability, supervised in face roof selection characteristic point
Survey, when the vertical displacement of characteristic point is more than 1.5m (Fig. 4), it is believed that face roof has occurred and that sliding instability, program fortune
Calculate and terminate.
Program returns to step (4), including following implementation steps：
1. extraction model maximal unbalanced force and face roof characteristic point vertical displacement；
2. setting maximal unbalanced force is 2e3N, judge whether maximal unbalanced force is less than setting value；Extract set cap
The end amount of crushing, judges whether the amount of crushing is more than 1.5m；
3. two kinds of processing methods are had according to judging result：
If a. maximal unbalanced force is less than setting value 2e3N or top plate characteristic point deflection is more than 1.5m, sequential operation is whole
Only, preserved；
If b. maximal unbalanced force is more than setting value 2e3N and top plate characteristic point deflection is less than 1.5m, program returns to step
Suddenly (4).
The present invention can be very good simulation artesian aquifer Stress Transmission by FISH sentences.Pass through internal stress
Border order applies complementary area power on artesian aquifer bottom interface, it is achieved thereby that artesian aquifer acts on artesian aquifer
Pressure on bottom interface is constant.Calamity mechanism, waterproof coal are caused to exploit sand coated iron mold unstability pressure rack under deep announcement artesian aquifer
Column rationally determines to wait research to provide method for numerical simulation.
Embodiment described above is only that the preferred embodiment of the present invention is described, not limiting this hair
Bright, all within the spiritual principles of the present invention, those of ordinary skill in the art are to any modification of the invention made, equivalent substitution
Deng should all be included in the protection scope of the present invention.
Claims (7)
1. load transmission method for numerical simulation is exploited under a kind of unconsolidated confined aquifer, it is characterised in that this method includes as follows
Step：
(1) according to engineering geological condition, numerical simulator is established, sets primary condition；
(2) model initial equilibrium conditions calculating is carried out；
(3) working face is excavated；
(4) judge whether the pressure from surrounding rock that acts on artesian aquifer bottom interface is less than piezometric head, if so, then containing
Apply complementary area power on water layer bottom interface, simulate artesian aquifer load permanent character；
(5) 500 time step of numerical simulator computing；
(6) whether judgment models computing reaches equilibrium state or sand coated iron mold has occurred and that sliding instability, if so, sequential operation is whole
Only, preserved；If not, program returns to step (4).
2. load transmission method for numerical simulation, its feature are exploited under a kind of unconsolidated confined aquifer according to claim 1
It is, in step (1), the engineering geological condition is the Moderate and Thick Unconsolidated Formation thin bedrock working face condition of we selected typical, according to work
Make face log sheet structure numerical simulator；The setting primary condition comprises the following steps：
1. taking coal petrography sample at the scene, by laboratory test, coal petrography physical and mechanical parameter is obtained；
2. assignment is carried out to numerical model coal rock layer attribute；
3. model boundary condition and primary condition are set according to working face buried depth and stress of primary rock size.
3. load transmission method for numerical simulation, its feature are exploited under a kind of unconsolidated confined aquifer according to claim 1
It is, described that working face is excavated in step (3), working face open-off cut is located at the left side 40m of model, direction of propulsion
For by left-to-right, since in actual production, working face about promotes 5m daily, therefore excavates 5m, model in numerical simulation every time
After computing balance, then carry out excavation next time.
4. load transmission method for numerical simulation, its feature are exploited under a kind of unconsolidated confined aquifer according to claim 1
It is, in step (4), the simulation artesian aquifer load permanent character, comprises the following steps：
1. travel through artesian aquifer bottom interface pressure from surrounding rock q；
2. judge that unconsolidated confined aquifer acts on whether the pressure from surrounding rock q on artesian aquifer bottom interface is more than aquifer water pressure
Power q0；
3. two kinds of processing methods are had according to judging result：
If the pressure from surrounding rock q a. acted on artesian aquifer bottom interface is less than piezometric head q0, then internal stress side is passed through
Boundary's order applies complementary area power △ q=q on artesian aquifer bottom interface0- q, then into step (5)；
If the pressure from surrounding rock q b. acted on artesian aquifer bottom interface is more than piezometric head q0, then step is entered directly into
(5)。
5. load transmission method for numerical simulation, its feature are exploited under a kind of unconsolidated confined aquifer according to claim 1
It is, in step (5), 500 time step of numerical simulator computing, step number can be according to model calculation speed during concrete operation
Degree and test accuracy requirement are adjusted.
6. load transmission method for numerical simulation, its feature are exploited under a kind of unconsolidated confined aquifer according to claim 1
It is, in step (6), the sand coated iron mold has occurred and that sliding instability, is carried out in face roof selection characteristic point
Monitoring, when the vertical displacement of characteristic point is more than 1.5m, it is believed that face roof has occurred and that sliding instability, and sequential operation is whole
Only.
7. load transmission method for numerical simulation, its feature are exploited under a kind of unconsolidated confined aquifer according to claim 1
It is, in step (6), the sequential operation terminates, and comprises the following steps：
1. extraction model maximal unbalanced force and face roof characteristic point vertical displacement；
2. judge whether maximal unbalanced force is less than setting value or whether the vertical displacement of top plate characteristic point is more than 1.5m；
3. two kinds of processing methods are had according to judging result：
If a. maximal unbalanced force is less than setting value or the vertical displacement of top plate characteristic point is more than 1.5m, sequential operation terminates, into
Row preserves；
If b. maximal unbalanced force is more than setting value and the vertical displacement of top plate characteristic point is less than 1.5m, program returns to step (4).
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