CN106761813B - Gob side entry driving unbalanced support design method under the unstable overlying strata in deep - Google Patents

Gob side entry driving unbalanced support design method under the unstable overlying strata in deep Download PDF

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Publication number
CN106761813B
CN106761813B CN201710057753.XA CN201710057753A CN106761813B CN 106761813 B CN106761813 B CN 106761813B CN 201710057753 A CN201710057753 A CN 201710057753A CN 106761813 B CN106761813 B CN 106761813B
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China
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anchor
bar
gob
supporting
anchor cable
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CN201710057753.XA
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Chinese (zh)
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CN106761813A (en
Inventor
樊克恭
王腾飞
龙军波
贾文明
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山东科技大学
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Priority to CN201710057753.XA priority Critical patent/CN106761813B/en
Publication of CN106761813A publication Critical patent/CN106761813A/en
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Publication of CN106761813B publication Critical patent/CN106761813B/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/006Lining anchored in the rock

Abstract

The present invention proposes gob side entry driving unbalanced support design method under a kind of unstable overlying strata in deep, comprises the following steps:Step 1: analysis digging condition;Step 2: selection back supporting construction and roadway's sides unbalanced support structure;Step 3: theoretical calculation primary election supporting parameter;Step 4: numerical simulation;Step 5: choose initial supporting parameter;Step 6: the construction in test section tunnel;Step 7: arrangement monitoring station, draws monitoring curve;Step 8: correcting initial supporting parameter, the supporting parameter for meeting gob side entry driving under the unstable overlying strata in deep is formed.Beneficial effects of the present invention:Gob side entry driving under the unstable overlying strata in deep can be realized safe efficiently, deformation of the surrounding rock in tunnel amount is small.

Description

Gob side entry driving unbalanced support design method under the unstable overlying strata in deep

Technical field

It is unstable more particularly to a kind of deep the present invention relates to deep coalmining gob side entry driving Roadway Support Technology field Determine gob side entry driving unbalanced support design method under overlying strata.

Background technology

The basic termination of overlying rock activity, stress caused by back production divide gob side entry driving again typically after Adjacent Working Face exploitation After cloth tends towards stability, to be stayed along mined out area edge and set thin coal pillar pick lane, tunnel side is to help thin coal pillar along sky, and side is entity coal, Surrounding rock structure has non-symmetrical features, different from general stope drift active workings.With the increase of pit mining depth, gob side entry driving shield lane is narrow Coal column is due to stress concentration, and deformation failure is serious, and deformation of the surrounding rock in tunnel, which destroys, obvious lack of balance phenomenon occurs;Because digging connects Continuous anxiety, part mine faces Adjacent Working Face exploitation, and to terminate rear overlying rock activity not yet stable, and need in advance stay and set narrow coal The problem of post gob side entry driving;Not only surrounding rock structure has a non-symmetrical features to this kind of gob side entry driving, and due to during gob side entry driving, phase Neighbour's work face goaf overlying rock activity is not yet terminated, stresses re-distribution caused by back production is not yet stable, and gob side entry driving will also Bearing the dynamic pressure of Adjacent Working Face overlying rock influences, and roadway support difficulty increases.Due to empty to the unstable overlying strata lower edge in deep The mechanism understanding deficiency of lane supporting is dug, often blindness is larger in supporting practice, and most tunnels are still equal by force using original grade Claim supporting, it is impossible to adapt to the non-symmetrical features of gob side entry driving surrounding rock structure, less adapt to Adjacent Working Face overlying rock dynamic pressure Under the influence of gob side entry driving shield lane thin coal pillar loading characteristic, and the lack of balance that thus caused deformation of the surrounding rock in tunnel destroys shows As, thus the deformation and destruction of deep gob side entry driving can not be controlled well.

The content of the invention

It is an object of the invention to provide gob side entry driving unbalanced support design method under a kind of unstable overlying strata in deep, solution The control problem of certainly existing gob side entry driving deformation of the surrounding rock in tunnel.

The present invention provides gob side entry driving unbalanced support design method under a kind of unstable overlying strata in deep, including following step Suddenly:

Step 1: the digging condition of analysis gob side entry driving opening position;

Step 2: selection back supporting construction and roadway's sides unbalanced support structure, make the supporting along empty side side Density is more than the support density of entity coal side side, makes the supporting intensity for being more than entity coal side side along the supporting intensity of empty side side;

Step 3: carrying out theoretical calculation determines a variety of of back supporting construction and roadway's sides unbalanced support structure Supporting parameter;

Step 4: some support parameter of back supporting construction and roadway's sides unbalanced support structure is carried out Numerical simulation, based on lateral disrumpent feelings, adjusting stage lateral-supporting pressure the distribution characteristics of operated adjacent face goaf overlying rock, Surrounding rock failure scope and prop force-bearing situation, analyze deformation of the surrounding rock in tunnel amount under different supporting parameters and help thin coal pillar along sky Stability;

Step 5: choosing, rock deformation is smaller, helps the preferable supporting parameter of thin coal pillar stability along sky, is pushed up as tunnel The initial supporting parameter of slab supporting structure and roadway's sides unbalanced support structure;

Step 6: according to back supporting construction and roadway's sides unbalanced support structure, and according to back branch The initial supporting parameter of protection structure and roadway's sides unbalanced support structure, test section tunnel is carried out in gob side entry driving opening position Construction;

Step 7: test section roadway layout lane surface displacement monitoring station, roof delamination monitoring station, rockbolt stress monitoring Stand, anchor cable load-bearing monitor station, entity coal side stress in coal bed monitoring station and thin coal pillar stress in coal bed monitoring station, each monitoring station record prison Survey data, according to Monitoring Data draw lane surface displacement curve, roof delamination amount change curve, rockbolt stress monitoring curve, Anchor cable load-bearing monitor curve and entity coal side and thin coal pillar stress in coal bed distribution curve;

Step 8: according to lane surface displacement curve, roof delamination amount change curve, rockbolt stress monitoring curve, anchor cable Load-bearing monitor curve and entity coal side and the thin coal pillar initial supporting parameter of stress in coal bed distribution curve amendment and formed and meet deep The supporting parameter of gob side entry driving under unstable overlying strata.

Further, in step 1, digging condition includes the geological conditions of gob side entry driving opening position, gob side entry driving opening position Supporting condition, gob side entry driving opening position surrounding rock structure non-symmetrical features condition, Adjacent Working Face exploitation opened with gob side entry driving The still unstabilized movement of time interval condition and gob side entry driving opening position between pick is to gob side entry driving roadway surrounding rock Deformation failure influence degree condition.

Further, in step 2, back supporting construction include bar-mat reinforcement, W steel bands, high-strength prestressed anchor pole, by The anchor cable girder steel assembly of anchor cable and girder steel composition, bar-mat reinforcement are close to back, and W steel bands are arranged in the outside of bar-mat reinforcement, more The high-strength prestressed anchor pole of root passes perpendicularly through W steel bands, bar-mat reinforcement, and the anchored end of high-strength prestressed anchor pole is connected in back, The both ends of girder steel offer anchor cable hole, and anchor cable is connected to back top phase through anchor cable hole, bar-mat reinforcement, the anchored end of anchor cable To in relatively stable rock stratum and anchor cable anchored end to tunnel entity coal help lateral deviation to;Roadway's sides unbalanced support structure can Realization has control to allow pressure, and roadway's sides unbalanced support structure includes helping supporting construction along sky side supporting construction and entity coal;Along sky Supporting construction is helped to include bar-mat reinforcement, W steel bands, high-strength prestressed pressure-relieving achor bar, the grouting cable anchor girder steel being made up of anchor cable and girder steel Assembly, bar-mat reinforcement are close to tunnel and helped along sky, and W steel bands are arranged in the outside of bar-mat reinforcement, and more high-strength prestressed pressure-relieving achor bars hang down Direct puncture crosses W steel bands, bar-mat reinforcement, and the anchored end of high-strength prestressed pressure-relieving achor bar is connected to tunnel along sky side, and the both ends of girder steel are opened Provided with anchor cable hole, grouting cable anchor is connected to tunnel along sky side through anchor cable hole, bar-mat reinforcement, the anchored end of grouting cable anchor;Entity Coal side supporting construction includes bar-mat reinforcement, reinforcing bar beam and steel band pallet component, high-strength prestressed pressure-relieving achor bar, by anchor cable and girder steel group Into anchor cable girder steel assembly, bar-mat reinforcement is close to tunnel entity coal side, and reinforcing bar beam is arranged in bar-mat reinforcement with steel band pallet component Outside, more high-strength prestressed pressure-relieving achor bars pass perpendicularly through reinforcing bar beam and steel band pallet component, bar-mat reinforcement, the high-strength prestressed pressure that allows The anchored end of anchor pole is connected in the entity coal side of tunnel, and the both ends of girder steel offer anchor cable hole, and anchor cable passes through anchor cable hole, reinforcing bar Net, the anchored end of anchor cable are connected in the entity coal side of tunnel.

Further, in step 3, carry out theoretical calculation and determine back supporting construction and the non-title branch of roadway's sides The supporting parameter of anchor pole, anchor cable in protection structure, the supporting parameter of anchor pole include the diameter of anchor pole, the length of anchor pole, anchor pole it is strong Degree, the support density of anchor pole, the pretightning force of anchor pole, the supporting parameter of anchor cable include the diameter of anchor cable, the length of anchor cable, anchor cable Intensity, the support density of anchor cable, the pretightning force of anchor cable, anchor cable anchoring section position.

Further, back supporting construction, in addition to side angle anchor pole, the anchored end of side angle anchor pole are arranged in tunnel top In plate and roadway floor.

Further, in back supporting construction, more high-strength prestressed anchor pole shape high-strength prestressed anchor poles in a row, An anchor cable is arranged every the high-strength prestressed anchor pole of a row.

Further, anchor cable alternately helps side close to the middle part in tunnel and tunnel along sky, and anchor cable girder steel assembly prolongs along tunnel The direction arrangement stretched.

Further, helped along sky along supporting construction, more high-strength prestressed pressure-relieving achor bar shapes are in a row high-strength prestressed to be allowed Anchor pole is pressed, every the high-strength prestressed pressure-relieving achor bar arrangement grouting cable anchor girder steel assembly of two rows;It is more in entity coal side supporting construction The high-strength prestressed pressure-relieving achor bar shape of root high-strength prestressed pressure-relieving achor bar in a row, every the high-strength prestressed pressure-relieving achor bar arrangement of two rows Anchor cable girder steel assembly.

Further, helped along sky in supporting construction, the length of grouting cable anchor is the 3/5 of coal pillar width.

Further, in entity coal side supporting construction, anchor end of anchorage cable will be located at Adjacent Working Face lateral-supporting pressure spike Value is nearby or on the outside of peak value.

Compared with prior art, gob side entry driving unbalanced support design method and applied under the unstable overlying strata in deep of the invention Work method has the characteristics that and advantage:

Gob side entry driving unbalanced support design method under the unstable overlying strata in deep of the present invention, can be realized safe efficiently Gob side entry driving under the unstable overlying strata in deep, deformation of the surrounding rock in tunnel amount are small.

After the embodiment of the present invention is read in conjunction with the figure, the features and advantages of the invention will become clearer.

Brief description of the drawings

In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are some embodiments of the present invention, for this area For those of ordinary skill, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is the flow of gob side entry driving unbalanced support design method under the unstable overlying strata of medium and deep of the embodiment of the present invention Figure;

Fig. 2 is tunnel roof support structure and roadway's sides unbalanced support structure section figure in the embodiment of the present invention;

Fig. 3 is tunnel roof support structure schematic diagram in the embodiment of the present invention;

Fig. 4 is to help supporting construction schematic diagram along sky in the embodiment of the present invention;

Fig. 5 is that entity coal helps supporting construction schematic diagram in the embodiment of the present invention;

Wherein, 1, bar-mat reinforcement, 21, W steel bands, 22, reinforcing bar beam and steel band pallet component, 31, high-strength prestressed anchor pole, 32, High-strength prestressed pressure-relieving achor bar, 33, side angle anchor pole, 4, girder steel, 51, anchor cable, 52, grouting cable anchor, 61, back, 62, more steady Determine rock stratum, 63, tunnel helped along sky, 631, thin coal pillar, 64, tunnel entity coal side, 65, roadway floor, 66, goaf.

Embodiment

As shown in Figures 1 to 5, the present embodiment provides gob side entry driving unbalanced support under a kind of unstable overlying strata in deep and designed Method, comprise the following steps:

Step 1: the digging condition of analysis gob side entry driving opening position, digging condition includes the geology of gob side entry driving opening position Condition (coal seam thickness, compression strength, roof and floor lithologic, geological structure and crustal stress etc.), the branch guard strip of gob side entry driving opening position Part (shield lane thin coal pillar size, mining depth, heading sizes etc.), the non-symmetrical features bar of gob side entry driving opening position surrounding rock structure Part, Adjacent Working Face exploitation and gob side entry driving dig between time interval condition and gob side entry driving opening position it is still unstabilized on Rock stratum is moved to gob side entry driving deformation of the surrounding rock in tunnel destroying infection degree condition;

Step 2: for helping the characteristics of stress distribution is unbalanced, and bearing strength difference is big along sky side thin coal pillar and entity coal, Back supporting construction and roadway's sides unbalanced support structure are selected, the support density along empty side side is helped more than entity coal The support density of side, make the supporting intensity for being more than entity coal side side along the supporting intensity of empty side side;

Step 3: carrying out theoretical calculation determines a variety of of back supporting construction and roadway's sides unbalanced support structure Supporting parameter, specifically determines the supporting parameter of a variety of anchor poles, anchor cable, and the supporting parameter of anchor pole includes the diameter of anchor pole, anchor pole Length, the intensity of anchor pole, the support density of anchor pole, the pretightning force of anchor pole, the supporting parameter of anchor cable include diameter, the anchor cable of anchor cable Length, the intensity of anchor cable, the support density of anchor cable, the pretightning force of anchor cable, anchor cable anchoring section position.Such as tunnel top In slab supporting structure, anchor cable length should make anchorage cable anchoring in the relatively stable rock stratum in top plate top, and its length is not less than 7.5m;It should be located at the thin coal pillar region of high stress close to Adjacent Working Face along the anchor cable in empty side supporting construction or grouting cable anchor anchored end Goaf side, length are chosen generally according to thin coal pillar width 1/2 to 3/5;In entity coal side supporting construction, anchor cable length is according to phase Adjacent working face lateral-supporting pressure distribution curve is chosen, and it is attached that anchor end of anchorage cable will be located at Adjacent Working Face lateral-supporting pressure peak On the outside of near or peak value.

Step 4: some support parameter of back supporting construction and roadway's sides unbalanced support structure is carried out Numerical simulation, based on lateral disrumpent feelings, adjusting stage lateral-supporting pressure the distribution characteristics of operated adjacent face goaf overlying rock, Surrounding rock failure scope and prop force-bearing situation, analyze deformation of the surrounding rock in tunnel amount under different supporting parameters and help thin coal pillar along sky Stability;

Step 5: choosing, rock deformation is smaller, helps the preferable supporting parameter of thin coal pillar stability along sky, is pushed up as tunnel The initial supporting parameter of slab supporting structure and roadway's sides unbalanced support structure;

Step 6: according to back supporting construction and roadway's sides unbalanced support structure, and according to back branch The initial supporting parameter of protection structure and roadway's sides unbalanced support structure, test section tunnel is carried out in gob side entry driving opening position Construction;

Step 7: test section roadway layout lane surface displacement monitoring station, roof delamination monitoring station, rockbolt stress monitoring Stand, anchor cable load-bearing monitor station, entity coal side stress in coal bed monitoring station and thin coal pillar stress in coal bed monitoring station, each monitoring station record prison Survey data, according to Monitoring Data draw lane surface displacement curve, roof delamination amount change curve, rockbolt stress monitoring curve, Anchor cable load-bearing monitor curve and entity coal side and thin coal pillar stress in coal bed distribution curve;

Step 8: according to lane surface displacement curve, roof delamination amount change curve, rockbolt stress monitoring curve, anchor cable Load-bearing monitor curve and entity coal side and the thin coal pillar initial supporting parameter of stress in coal bed distribution curve amendment and formed and meet deep The supporting parameter of gob side entry driving under unstable overlying strata.For example coal body (entity coal side, thin coal pillar) distribution curve of stress is mainly used in The damage envelope of analysis entities coal side and the stability along empty side thin coal pillar, and judge entity coal side accordingly, help thin coal pillar along sky The reasonability of the supporting parameters such as anchor pole, anchor cable;Judge whether entity coal side anchor end of anchorage cable is located at Adjacent Working Face lateral-supporting Pressure peak judges whether thin coal pillar side anchor end of anchorage cable is adopted in the region of high stress close to Adjacent Working Face nearby or on the outside of peak value Dead zone side.

Gob side entry driving unbalanced support design method under the unstable overlying strata in deep in the present embodiment, in step 2, lane Road roof support structure includes bar-mat reinforcement 1, W steel bands 21, high-strength prestressed anchor pole 31, girder steel 4 and anchor cable 51.More it is high-strength it is pre- should Power anchor pole 31 and W steel bands 21 form combination supporting unit, to form shallow-layer supporting.Two anchor cables 51 form anchor cable steel with girder steel 4 Beam assembly supporting unit, to form deep support.Bar-mat reinforcement 1 is close to back 61, and W steel bands 21 are arranged in bar-mat reinforcement 1 Outside, more high-strength prestressed anchor poles 31 pass perpendicularly through W steel bands 21, bar-mat reinforcement 1, the anchored end connection of high-strength prestressed anchor pole 31 In back 61, the both ends of girder steel 4 offer anchor cable hole, and anchor cable 51 passes through anchor cable hole, bar-mat reinforcement 1, the anchoring of anchor cable 51 End is connected in the relatively stable rock stratum 62 in the top of back 61.Anchor cable 51 is nest anchor ropes, and end Bird's Nest number is no less than 3, The diameter of anchor cable 51 is not less than 17.8mm, and anchor cable tensile strength is not less than 1860MPa.The anchored end of anchor cable 51 is to tunnel entity coal Help 64 lateral deviations to, preferably can be relative to perpendicular to the direction of back 61, the anchored end of anchor cable 51 is to tunnel entity coal Side 64 is helped to be inclined to 10 degree.In back supporting construction, the more high-strength prestressed shapes of anchor pole 31 are in a row, high-strength every a row Prestressed anchor 31 arranges an anchor cable 51, and anchor cable 51 helps 63 sides close to the middle part in tunnel and tunnel along sky, and girder steel 4 is disposed with two Row, girder steel 4 are alternately arranged along the direction that tunnel extends.Bar-mat reinforcement 1 plays overall package action to back 61, it is high-strength it is pre- should Power anchor pole 31 and W steel bands 21 play shallow-layer supporting, and anchor cable 51 and girder steel 4 play deep support.In back supporting construction, also Including help angle anchor pole 33, side angle anchor pole 33 anchored end be arranged in the rock stratum of back 61 and roadway floor 65 in, preferably The rock stratum face of side angle anchor pole and back 61, the angle of roadway floor 65 be 10 degree.

Roadway's sides unbalanced support structure can realize that control allows pressure, and it is included along sky side supporting construction and entity coal side Supporting construction, different supporting construction and supporting intensity are used along sky side supporting construction, entity coal side supporting construction.Along empty side branch Protection structure includes bar-mat reinforcement 1, W steel bands 21, high-strength prestressed pressure-relieving achor bar 32, girder steel 4 and grouting cable anchor 52.More it is high-strength it is pre- should Power pressure-relieving achor bar 32 and W steel bands 21 form combination supporting unit, to form prestressing force bearing structure.Two grouting cable anchors 52 and steel Beam 4 forms grouting cable anchor girder steel assembly supporting unit, for strengthening integer support effect.The length of grouting cable anchor 52 is tunnel Along the 3/5 of the width of thin coal pillar 631 of empty side 63.Bar-mat reinforcement 1 is close to tunnel and is arranged in the outer of bar-mat reinforcement 1 along empty side 63, W steel bands 21 Side, more high-strength prestressed pressure-relieving achor bars 32 pass perpendicularly through W steel bands 21, bar-mat reinforcement 1, the anchoring of high-strength prestressed pressure-relieving achor bar 32 End is connected to tunnel along sky side 63, and the both ends of girder steel 4 offer anchor cable hole, and grouting cable anchor 52 passes through anchor cable hole, bar-mat reinforcement 1, The anchored end of grouting cable anchor 52 is connected to tunnel along sky side 63.Along along empty side supporting construction, the more high-strength prestressed pressure anchors that allow The shape of bar 32 is in a row, arranges girder steel 4 every the high-strength prestressed pressure-relieving achor bar 32 of two rows, girder steel 4 is vertically arranged to be helped in tunnel along sky 63 middle and upper part.Bar-mat reinforcement 1 plays overall package action, high-strength prestressed pressure-relieving achor bar 32 and W steel bands to tunnel along sky side 63 21 are used to form prestressing force bearing structure, and high-strength prestressed pressure-relieving achor bar 32 is more than in lane in arrangement density of the tunnel along sky side 63 The arrangement density of road entity coal side 64, grouting cable anchor 52 and girder steel 4 are used for Enhanced support group effect.Entity coal helps supporting construction Including bar-mat reinforcement 1, reinforcing bar beam and steel band pallet component 22, high-strength prestressed pressure-relieving achor bar 32, girder steel 4 and anchor cable 51.More height Strength prestressed pressure-relieving achor bar 32 and reinforcing bar beam form combination supporting unit with steel band pallet component 22, to form prestressing force carrying knot Structure.Two anchor cables 51 form anchor cable girder steel assembly supporting unit with girder steel 4, for strengthening integer support effect.Bar-mat reinforcement 1 is tight Tunnel entity coal side 64 is pasted, reinforcing bar beam is arranged in the outside of bar-mat reinforcement 1, the more high-strength prestressed pressures that allow with steel band pallet component 22 Anchor pole 32 passes perpendicularly through reinforcing bar beam and steel band pallet component 22, bar-mat reinforcement 1, the anchored end connection of high-strength prestressed pressure-relieving achor bar 32 In tunnel entity coal side 64, the both ends of girder steel 4 offer anchor cable hole, and anchor cable 51 passes through anchor cable hole, bar-mat reinforcement 1, anchor cable 51 Anchored end is connected in tunnel entity coal side 64, and the anchored end of anchor cable 51 will be located near Adjacent Working Face lateral-supporting pressure peak Or on the outside of peak value.Anchor cable 51 is nest anchor ropes, and end Bird's Nest number is no less than 3, and the diameter of anchor cable 51 is not less than 17.8mm, anchor Rope tensile strength is not less than 1860MPa.In entity coal side supporting construction, the more high-strength prestressed shapes of pressure-relieving achor bar 32 are in a row, Girder steel 4 is arranged every the high-strength prestressed pressure-relieving achor bar 32 of two rows, girder steel 4 is vertically arranged in the middle and upper part of tunnel entity coal side 64. Bar-mat reinforcement 1 plays overall package action, high-strength prestressed pressure-relieving achor bar 32 and reinforcing bar beam and steel band support to tunnel entity coal side 64 Disk component 22 is used to form prestressing force bearing structure, and anchor cable 51 and girder steel 4 are used for Enhanced support group effect.

Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck The variations, modifications, additions or substitutions that the technical staff in domain is made in the essential scope of the present invention, it should also belong to the present invention's Protection domain.

Claims (10)

1. gob side entry driving unbalanced support design method under a kind of unstable overlying strata in deep, it is characterised in that comprise the following steps:
Step 1: the digging condition of analysis gob side entry driving opening position;
Step 2: selection back supporting construction and roadway's sides unbalanced support structure, make the support density along empty side side More than the support density of entity coal side side, make the supporting intensity for being more than entity coal side side along the supporting intensity of empty side side;
Step 3: carry out some support that theoretical calculation determines back supporting construction and roadway's sides unbalanced support structure Parameter;
Step 4: numerical value is carried out to some support parameter of back supporting construction and roadway's sides unbalanced support structure Simulation, based on operated adjacent face goaf overlying rock lateral disrumpent feelings, adjusting stage lateral-supporting pressure distribution characteristics, country rock Damage envelope and prop force-bearing situation, analyze deformation of the surrounding rock in tunnel amount and the stabilization along empty side thin coal pillar under different supporting parameters Property;
Step 5: choosing, rock deformation is smaller, helps the preferable supporting parameter of thin coal pillar stability along sky, as back branch The initial supporting parameter of protection structure and roadway's sides unbalanced support structure;
Step 6: according to back supporting construction and roadway's sides unbalanced support structure, and according to back supporting knot The initial supporting parameter of structure and roadway's sides unbalanced support structure, applying for test section tunnel is carried out in gob side entry driving opening position Work;
Step 7: test section roadway layout lane surface displacement monitoring station, roof delamination monitoring station, rockbolt stress monitoring station, anchor Rope load-bearing monitor station, entity coal side stress in coal bed monitoring station and thin coal pillar stress in coal bed monitoring station, each monitoring station record monitoring number According to according to Monitoring Data drafting lane surface displacement curve, roof delamination amount change curve, rockbolt stress monitoring curve, anchor cable Load-bearing monitor curve and entity coal side and thin coal pillar stress in coal bed distribution curve;
Step 8: according to lane surface displacement curve, roof delamination amount change curve, rockbolt stress monitoring curve, anchor cable stress Monitoring curve and entity coal side and the thin coal pillar initial supporting parameter of stress in coal bed distribution curve amendment and being formed meets deep shakiness Determine the supporting parameter of gob side entry driving under overlying strata.
2. gob side entry driving unbalanced support design method under the unstable overlying strata in deep according to claim 1, its feature exist In:In step 1, digging condition includes the geological conditions of gob side entry driving opening position, the supporting condition of gob side entry driving opening position, edge The non-symmetrical features condition of Kong Jue lanes opening position surrounding rock structure, Adjacent Working Face were exploited between the time between gob side entry driving digging Parting bead part and the still unstabilized movement of gob side entry driving opening position are to gob side entry driving deformation of the surrounding rock in tunnel destroying infection journey Degree condition.
3. gob side entry driving unbalanced support design method under the unstable overlying strata in deep according to claim 1, its feature exist In:In step 2, back supporting construction includes bar-mat reinforcement, W steel bands, high-strength prestressed anchor pole, is made up of anchor cable and girder steel Anchor cable girder steel assembly, bar-mat reinforcement is close to back, and W steel bands are arranged in the outside of bar-mat reinforcement, more high-strength prestressed anchors Bar passes perpendicularly through W steel bands, bar-mat reinforcement, and the anchored end of high-strength prestressed anchor pole is connected in back, and the both ends of girder steel open up There is anchor cable hole, anchor cable is connected in the relatively stable rock stratum in back top through anchor cable hole, bar-mat reinforcement, the anchored end of anchor cable And the anchored end of anchor cable to tunnel entity coal help lateral deviation to;Roadway's sides unbalanced support structure can realize that control allows pressure, Roadway's sides unbalanced support structure includes helping supporting construction along sky side supporting construction and entity coal;Include along empty side supporting construction Bar-mat reinforcement, W steel bands, high-strength prestressed pressure-relieving achor bar, the grouting cable anchor girder steel assembly being made up of anchor cable and girder steel, bar-mat reinforcement are tight Paste tunnel to help along sky, W steel bands are arranged in the outside of bar-mat reinforcement, and more high-strength prestressed pressure-relieving achor bars pass perpendicularly through W steel bands, reinforcing bar Net, the anchored end of high-strength prestressed pressure-relieving achor bar are connected to tunnel along sky side, and the both ends of girder steel offer anchor cable hole, slip casting anchor Rope is connected to tunnel along sky side through anchor cable hole, bar-mat reinforcement, the anchored end of grouting cable anchor;Entity coal side supporting construction includes steel Muscle net, reinforcing bar beam and steel band pallet component, high-strength prestressed pressure-relieving achor bar, the anchor cable girder steel that is made up of anchor cable and girder steel combine Body, bar-mat reinforcement are close to tunnel entity coal side, and reinforcing bar beam is arranged in the outside of bar-mat reinforcement with steel band pallet component, more it is high-strength it is pre- should Power pressure-relieving achor bar passes perpendicularly through reinforcing bar beam and steel band pallet component, bar-mat reinforcement, the anchored end connection of high-strength prestressed pressure-relieving achor bar In tunnel entity coal side, the both ends of girder steel offer anchor cable hole, and anchor cable connects through anchor cable hole, bar-mat reinforcement, the anchored end of anchor cable It is connected in the entity coal side of tunnel.
4. gob side entry driving unbalanced support design method under the unstable overlying strata in deep according to claim 3, its feature exist In:In step 3, carry out theoretical calculation and determine anchor pole, anchor in back supporting construction and roadway's sides unbalanced support structure The supporting parameter of rope, the supporting parameter of anchor pole are close including the diameter of anchor pole, the length of anchor pole, the intensity of anchor pole, the supporting of anchor pole Degree, the pretightning force of anchor pole, the supporting parameter of anchor cable include the supporting of the diameter of anchor cable, the length of anchor cable, the intensity, anchor cable of anchor cable Density, the pretightning force of anchor cable, anchor cable anchoring section position.
5. gob side entry driving unbalanced support design method under the unstable overlying strata in deep according to claim 3, its feature exist In:Back supporting construction, in addition to side angle anchor pole, the anchored end of side angle anchor pole are arranged in back and roadway floor In.
6. gob side entry driving unbalanced support design method under the unstable overlying strata in deep according to claim 3, its feature exist In:In back supporting construction, more high-strength prestressed anchor pole shape high-strength prestressed anchor poles in a row are high-strength pre- every a row Stress anchor pole arranges an anchor cable.
7. gob side entry driving unbalanced support design method under the unstable overlying strata in deep according to claim 6, its feature exist In:Anchor cable alternately helps side close to the middle part in tunnel and tunnel along sky, and the direction that anchor cable girder steel assembly extends along tunnel is arranged.
8. gob side entry driving unbalanced support design method under the unstable overlying strata in deep according to claim 3, its feature exist In:Along along empty side supporting construction, more high-strength prestressed pressure-relieving achor bar shape high-strength prestressed pressure-relieving achor bars in a row, every two rows High-strength prestressed pressure-relieving achor bar arranges grouting cable anchor girder steel assembly;In entity coal side supporting construction, more high-strength prestressed to allow Anchor pole shape high-strength prestressed pressure-relieving achor bar in a row is pressed, every the high-strength prestressed pressure-relieving achor bar arrangement anchor cable girder steel combination of two rows Body.
9. gob side entry driving unbalanced support design method under the unstable overlying strata in deep according to claim 3, its feature exist In:Along along empty side supporting construction, the length of grouting cable anchor is the 3/5 of coal pillar width.
10. gob side entry driving unbalanced support design method under the unstable overlying strata in deep according to claim 3, its feature exist In:In entity coal side supporting construction, anchor end of anchorage cable will be located at Adjacent Working Face lateral-supporting pressure peak nearby or outside peak value Side.
CN201710057753.XA 2017-01-23 2017-01-23 Gob side entry driving unbalanced support design method under the unstable overlying strata in deep CN106761813B (en)

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CN201710057753.XA CN106761813B (en) 2017-01-23 2017-01-23 Gob side entry driving unbalanced support design method under the unstable overlying strata in deep

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Application Number Priority Date Filing Date Title
CN201710057753.XA CN106761813B (en) 2017-01-23 2017-01-23 Gob side entry driving unbalanced support design method under the unstable overlying strata in deep
PCT/CN2017/108718 WO2018133493A1 (en) 2017-01-23 2017-10-31 Unbalanced support design method for gob-side entry driving under deep unstable cover rock

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