CN107035406A - A kind of three-soft seam is faced upward, underhand stopes support anti-plug bottom method - Google Patents
A kind of three-soft seam is faced upward, underhand stopes support anti-plug bottom method Download PDFInfo
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- CN107035406A CN107035406A CN201710383847.6A CN201710383847A CN107035406A CN 107035406 A CN107035406 A CN 107035406A CN 201710383847 A CN201710383847 A CN 201710383847A CN 107035406 A CN107035406 A CN 107035406A
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- bracket base
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
Faced upward the invention discloses a kind of three-soft seam, underhand stopes support anti-plug bottom method, using the analysis method of shallow square foundation ultimate bearing capacity, it is assumed that bottom plate deadweight is when being zero, according to cohesive strength c, internal friction angle, bracket base width a and support insert bottom depth d and calculate bottom plate limiting pressure q'u；It is assumed that bottom plate is without cohesive strength, overloading free calculates overloading free situation lower shoe limiting pressure q "u；Bottom plate actual conditions are integrated again, i.e., when bottom plate deadweight, cohesive strength and overload etc. are not zero, calculate bottom plate limiting pressure qu；Then statistical work face calculates mean specific pressure P of the bracket base to bottom plate, judges that support inserts bottom, bottom plate mean specific pressure is reduced by increasing bracket base area come support maximum operation resistance F during pressing, comprehensive support deadweight G and bracket base length b；Support is reduced with this and inserts bottom phenomenon, it is ensured that " three is soft " coal seam pitches mining face and normally produced.
Description
Technical field
It is especially a kind of to be applied to determine " three is soft " coal seam the present invention relates to a kind of coal-face support anti-plug bottom method
Face upward, the method at underhand stopes anti-plug bottom.
Background technology
Hydraulic support is the main support apparatus of fully-mechanized mining working, is worked for top " three is soft " coal seam that soft, coal is soft, bottom is soft
The slotting bottom problem of face hydraulic support, always is restriction working surface production efficiency principal element.It is main that hydraulic support foundation inserts bottom
It is that the compression strength of floor undulation is caused less than hydraulic support foundation to the mean specific pressure of bottom plate, the phase is pressed in working face
Between, bottom plate bears pressure and reaches maximum, inserts bottom phenomenon frequency now, causes support reach difficult.
At present, solve the problems, such as that support inserts bottom and relies primarily on floor grouting reinforcement technique to change the cohesive strength c of bottom plate, so that
Improving bottom plate bearing capacity prevents support from inserting bottom, but floor grouting reinforcement technique requires higher to grouting process, and economic effect
Benefit is poor.Therefore, a kind of method convenient to carry out, good in economic efficiency is sought, solving the slotting bottom of hydraulic support foundation causes before support
It is the big problem of anxious to be resolved one to move difficult situation.
The content of the invention
Technical problem：The invention aims to overcome weak point of the prior art, there is provided a kind of " three is soft " coal seam
Face upward, underhand stopes support inserts bottom method, bottom plate mean specific pressure reduced to prevent support from inserting bottom by increasing bracket base area,
Optimization increase bracket base length so that realize " three is soft " coal seam face upward, the safe and efficient production in underhand stopes.
Technical scheme：" three is soft " coal seam of the present invention is faced upward, underhand stopes support anti-plug bottom method, is comprised the following steps：
A, first, using the analysis method of shallow square foundation ultimate bearing capacity, it is assumed that bottom plate deadweight is zero, during coal seam floor failure
For indeformable rigid-plastic material, the frictional force and bracket base both sides bottom plate of bracket base both sides and bottom plate coal and rock are disregarded
The influence of shearing strength, according to cohesive strength c, internal friction angleBracket base width a and support insert bottom depth d and calculate bottom
Plate electrode limits pressure q'u；
B, hypothesis bottom plate are without cohesive strength, and overloading free calculates overloading free situation lower shoe limiting pressure q "u, in addition, comprehensive
Close under bottom plate actual conditions, i.e., when bottom plate deadweight, cohesive strength and overload are not zero, calculate plate electrode limits pressure q on earthu；
Support maximum operation resistance F during c, the propulsion with working face, writing task face first weighting and periodic weighting,
Comprehensive support deadweight G and bracket base length b, calculates mean specific pressure P of the bracket base to bottom plate；
D, make support insert bottom depth d=0, compare P and quSize；
If P<qu, i.e. the mean specific pressure of support bottom plate is less than bottom plate ultimate bearing pressure, and support does not insert bottom；
If P>qu, i.e. the mean specific pressure of support bottom plate is more than bottom plate ultimate bearing pressure, and judgement support can insert bottom, now,
Reduce bottom plate mean specific pressure by increasing bracket base area to prevent support from inserting bottom；
E, prevent support insert bottom way be：In the case where bracket base width a can not be changed, by increasing support bottom
Seat length b is to increase the base area of support, and calculating prevents support from inserting bracket base length b' needed for bottom, and this length is anti-
Only support inserts the minimum bracket base length at bottom；
F, according to minimum bracket base length b', increase length b'-b needed for support is obtained, in the front portion weldering of bracket base
Increase length b'-b lengthened plate needed for connecing bracket base, so as to prevent support from inserting the generation of bottom phenomenon.
2nd, a kind of " three is soft " coal seam according to claim 1 face upward, underhand stopes support anti-plug bottom method, its feature
It is：It is described calculate prevent support insert bottom needed for bracket base length b' formula it is as follows：
In formula：Nq- and internal friction angleRelevant coefficient of bearing caoacity；
The severe of γ-coal and rock；
Sγ- Hansen base shape correction factors, take 0.6；
Ny- Hansen coefficient of bearing caoacities.
Beneficial effect：As a result of such scheme, the present invention is based on shallow square foundation analysis of Ultimate bottom plate
Ultimate bearing pressure, it is considered to which working face is come during pressing, bottom plate bears working resistance of support in the case of maximum load, by increasing branch
Frame base area reduces bottom plate mean specific pressure to prevent support from inserting bottom.Because force piece base width fixes immutable, therefore
And increase bracket base length by welding lengthened plate before bracket base, so as to realize that " three is soft " coal seam is faced upward, bows and adopt work
The safe and efficient production in face, reduces " three is soft " coal seam and pitches the slotting bottom phenomenon of mining face support, it is ensured that working face is safe and efficient
Exploitation.
Brief description of the drawings
Fig. 1 acts on lower shoe sliding surface cross-sectional schematic schematic diagram for the bracket base of the present invention.
Contrast schematic diagram before and after Fig. 2 lengthens for the bracket base of the present invention.
In figure：I-active region, II-transition region, III-Rankine passive area, F- support maximum operation resistances, the deadweight of G- supports.
Embodiment
" three is soft " coal seam of the present invention is faced upward, underhand stopes support anti-plug bottom method, is comprised the following steps that：
A, first, using the analysis method of shallow square foundation ultimate bearing capacity, it is assumed that bottom plate deadweight is zero, during coal seam floor failure
For indeformable rigid-plastic material, the frictional force and bracket base both sides bottom plate of bracket base both sides and bottom plate coal and rock are disregarded
The influence of shearing strength, according to cohesive strength c, internal friction angleBracket base width a and support insert bottom depth d and calculate bottom
Plate electrode limits pressure q'u；
B, hypothesis bottom plate are without cohesive strength, and overloading free calculates overloading free situation lower shoe limiting pressure q "u, in addition, comprehensive
Close under bottom plate actual conditions, i.e., when bottom plate deadweight, cohesive strength and overload are not zero, calculate plate electrode limits pressure q on earthu；
Support maximum operation resistance F during c, the propulsion with working face, writing task face first weighting and periodic weighting,
Comprehensive support deadweight G and bracket base length b, calculates mean specific pressure P of the bracket base to bottom plate；
D, make support insert bottom depth d=0, compare mean specific pressure P and bottom plate limiting pressure quSize；
If P<qu, i.e. the mean specific pressure of support bottom plate is less than bottom plate ultimate bearing pressure, and support does not insert bottom；
If P>qu, i.e. the mean specific pressure of support bottom plate is more than bottom plate ultimate bearing pressure, and judgement support can insert bottom, now,
Reduce bottom plate mean specific pressure by increasing bracket base area to prevent support from inserting bottom；
E, prevent support insert bottom way be：In the case where bracket base width a can not be changed, by increasing support bottom
Seat length b increases the base area of support, i.e., reduce bottom plate mean specific pressure by increasing bracket base length to prevent from inserting bottom,
Calculating prevents support from inserting bracket base length b' needed for bottom, and this length is to prevent that the minimum bracket base at the slotting bottom of support is long
Degree；
It is described calculate prevent support insert bottom needed for bracket base length b' formula it is as follows：
In formula：Nq- withRelevant coefficient of bearing caoacity；
The severe of γ-coal and rock；
Sγ- Hansen base shape correction factors, take 0.6；
Ny- Hansen coefficient of bearing caoacities.
The minimum bracket base length b' that f, basis are calculated, increase length b'-b needed for obtaining support, as shown in Fig. 2
Increase length b'-b lengthened plate needed for anterior welding support base in bracket base, by increasing bracket base length, subtract
Limited bracket inserts bottom phenomenon, or the generation for preventing support from inserting bottom phenomenon, it is ensured that " three is soft " coal seam pitches mining face and normally produced.
One embodiment of the present of invention is further described below in conjunction with the accompanying drawings：
As shown in figure 1, in the presence of working face is come support maximum operation resistance F during pressing and support deadweight G, working as bottom plate
During generation overall shear failure, its sliding surface extends to layer plane where bottom plate, and sliding surface is by straight line, logarithmic spiral curve
With the part of straight line three composition, the sliding area of the generation of bottom plate is divided into active region I, transition region II and Rankine passive area III 3
Area, active region I is with horizontal sextant angleRankine passive area III is with horizontal sextant angleIt is right in transition region II
Number helical curve and active region I and the straight line of Rankine passive area III are tangent；
A, first, using the analysis method of shallow square foundation ultimate bearing capacity, it is assumed that bottom plate deadweight is zero, during coal seam floor failure
For indeformable rigid-plastic material, the frictional force and bracket base both sides bottom plate of bracket base both sides and bottom plate coal and rock are disregarded
The influence of shearing strength, according to cohesive strength c, internal friction angleBracket base width a, support are inserted each in bottom depth d and accompanying drawing 1
Sliding area angular relationship analyzes active region I, transition region II-and the stressing conditions of Rankine passive area III respectively, draws the bottom plate limit
PressureWherein
B, hypothesis bottom plate are without cohesive strength, and overloading free, i.e. cohesive strength c=0, support insert bottom depth d=0, directly utilize
Hansen base shape correction factor Sγ=0.6, draw overloading free situation lower shoe limiting pressureWhereinIn addition, under comprehensive bottom plate actual conditions, i.e. bottom
When plate deadweight, cohesive strength and overload are not zero, plate electrode limits pressure q on earth is calculatedu, i.e.,
Support maximum operation resistance F during c, the propulsion with working face, writing task face first weighting and periodic weighting,
Comprehensive support deadweight G and bracket base length b, calculates mean specific pressure of the bracket base to bottom plate
D, make support insert bottom depth d=0, compare P and quSize；
If P<qu, i.e. the mean specific pressure of support bottom plate is less than bottom plate ultimate bearing pressure, and support does not insert bottom；
If P>qu, i.e. the mean specific pressure of support bottom plate is more than bottom plate ultimate bearing pressure, and judgement support can insert bottom, now,
Reduce bottom plate mean specific pressure by increasing bracket base area to prevent support from inserting bottom；
E, prevent support insert bottom way be：In the case where bracket base width a can not be changed, by increasing support bottom
Seat length b is to increase the base area of support, and calculating prevents support from inserting bracket base length needed for bottomThis length is the minimum bracket base length for preventing support from inserting bottom；
F, according to minimum bracket base length b', increase length b'-b needed for support is obtained, as shown in Figure 2, in branch
Increase length b'-b lengthened plate needed for the anterior welding support base of frame base, so as to prevent support from inserting the generation of bottom phenomenon.
Nq- represent withRelevant coefficient of bearing caoacity, acts on lower shoe sliding surface by the medium-height trestle base of accompanying drawing 1 and cuts open
Angular relationship is derived in the schematic diagram of face.
Claims (2)
1. a kind of three-soft seam is faced upward, underhand stopes support anti-plug bottom method, it is characterised in that comprised the following steps：
A, first, using the analysis method of shallow square foundation ultimate bearing capacity, it is assumed that bottom plate deadweight is zero, for not during coal seam floor failure
The rigid-plastic material of deformation, disregards frictional force and the shearing resistance of bracket base both sides bottom plate of the bracket base both sides with bottom plate coal and rock
The influence of intensity, according to cohesive strength c, internal friction angleBracket base width a and support insert bottom depth d and calculate bottom plate pole
Limits pressure q'u；
B, hypothesis bottom plate are without cohesive strength, and overloading free calculates overloading free situation lower shoe limiting pressure q "u, in addition, comprehensive bottom plate
Under actual conditions, i.e., when bottom plate deadweight, cohesive strength and overload are not zero, calculate plate electrode limits pressure q on earthu；
Support maximum operation resistance F during c, the propulsion with working face, writing task face first weighting and periodic weighting, it is comprehensive
Support deadweight G and bracket base length b, calculates mean specific pressure P of the bracket base to bottom plate；
D, make support insert bottom depth d=0, compare P and quSize；
If P<qu, i.e. the mean specific pressure of support bottom plate is less than bottom plate ultimate bearing pressure, and support does not insert bottom；
If P>qu, i.e. the mean specific pressure of support bottom plate is more than bottom plate ultimate bearing pressure, judges that support can insert bottom, now, by increasing
Plus bracket base area to reduce bottom plate mean specific pressure to prevent support from inserting bottom；
E, prevent support insert bottom way be：It is long by increasing bracket base in the case where bracket base width a can not be changed
B is spent to increase the base area of support, calculating prevents support from inserting bracket base length b' needed for bottom, this length is to prevent branch
Frame inserts the minimum bracket base length at bottom；
F, according to minimum bracket base length b', increase length b'-b needed for support is obtained, in the anterior welding branch of bracket base
Increase length b'-b lengthened plate needed for frame base, so as to prevent support from inserting the generation of bottom phenomenon.
2. a kind of three-soft seam according to claim 1 is faced upward, underhand stopes support anti-plug bottom method, it is characterised in that：
It is described calculate prevent support insert bottom needed for bracket base length b' formula it is as follows：
In formula：Nq- and internal friction angleRelevant coefficient of bearing caoacity；
The severe of γ-coal and rock；
Sγ- Hansen base shape correction factors, take 0.6；
Ny- Hansen coefficient of bearing caoacities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710383847.6A CN107035406B (en) | 2017-05-26 | 2017-05-26 | A kind of three-soft seam faces upward, underhand stopes bracket anti-plug bottom method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710383847.6A CN107035406B (en) | 2017-05-26 | 2017-05-26 | A kind of three-soft seam faces upward, underhand stopes bracket anti-plug bottom method |
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| Publication Number | Publication Date |
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| CN107035406A true CN107035406A (en) | 2017-08-11 |
| CN107035406B CN107035406B (en) | 2019-03-19 |
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| CN201710383847.6A Expired - Fee Related CN107035406B (en) | 2017-05-26 | 2017-05-26 | A kind of three-soft seam faces upward, underhand stopes bracket anti-plug bottom method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113449414A (en) * | 2021-06-07 | 2021-09-28 | 西安科技大学 | Three-layer structure-based bottom plate slippage failure depth calculation method |
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| CN203230449U (en) * | 2012-12-28 | 2013-10-09 | 中国神华能源股份有限公司 | Hydraulic support for soft rock working surface |
| CN103410547A (en) * | 2013-08-29 | 2013-11-27 | 郑州煤矿机械集团股份有限公司 | Thin seam hydraulic support for coal mines |
| CN103557023A (en) * | 2013-11-15 | 2014-02-05 | 中煤北京煤矿机械有限责任公司 | Hydraulic bracket for extremely soft coal bed |
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2017
- 2017-05-26 CN CN201710383847.6A patent/CN107035406B/en not_active Expired - Fee Related
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| CN203230449U (en) * | 2012-12-28 | 2013-10-09 | 中国神华能源股份有限公司 | Hydraulic support for soft rock working surface |
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| CN103557023A (en) * | 2013-11-15 | 2014-02-05 | 中煤北京煤矿机械有限责任公司 | Hydraulic bracket for extremely soft coal bed |
| CN204002884U (en) * | 2014-07-17 | 2014-12-10 | 山西平阳重工机械有限责任公司 | Device of the anti-tie end of soft-rock tunnel advance timbering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113449414A (en) * | 2021-06-07 | 2021-09-28 | 西安科技大学 | Three-layer structure-based bottom plate slippage failure depth calculation method |
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Address after: 221116 Research Institute of China University of Mining and Technology,, Jiangsu Applicant after: China University of Mining & Technology Address before: 221116 Research Institute, China University of Mining and Technology, Xuzhou University, Jiangsu, China, Applicant before: China University of Mining & Technology |
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