CN202325548U - Secondary yielding uniform pressure supporting structure of roadway surrounding rock under high ground stress - Google Patents

Secondary yielding uniform pressure supporting structure of roadway surrounding rock under high ground stress Download PDF

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Publication number
CN202325548U
CN202325548U CN2011204901865U CN201120490186U CN202325548U CN 202325548 U CN202325548 U CN 202325548U CN 2011204901865 U CN2011204901865 U CN 2011204901865U CN 201120490186 U CN201120490186 U CN 201120490186U CN 202325548 U CN202325548 U CN 202325548U
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China
Prior art keywords
roadway
supporting
surrounding rock
section
plurality
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CN2011204901865U
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Chinese (zh)
Inventor
于远祥
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西安科技大学
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Priority to CN2011204901865U priority Critical patent/CN202325548U/en
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Publication of CN202325548U publication Critical patent/CN202325548U/en

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Abstract

The utility model discloses a secondary yielding uniform pressure supporting structure of roadway surrounding rock under high ground stress. The supporting structure comprises a steel gantry which is arranged in a dug roadway in the extending direction of the roadway and used for full-section supporting of the dug roadway, a soft backfilling layer consisting of an elastic material filled between the steel gantry and the dug interface of the roadway, and a plurality of full-section supporting mechanisms which are arranged on the section of the dug roadway in the extending direction of the roadway, wherein each full-section supporting mechanism comprises a full-section anchor rod supporting system which is arranged on the section of the dug roadway and consists of a plurality of anchor rods and a full-section anchor cable supporting system which is arranged on the section of the dug roadway and consists of a plurality of anchor cables; and a reserved clearance for arranging the soft backfilling layer is arranged between the steel gantry and the dug interface of the roadway. The secondary yielding uniform pressure supporting structure has the advantages of reasonable structural design, convenience in construction, low input cost and good using effect, and can realize uniform pressure yielding and avoid integral instability due to yielding deformation produced by the stress concentration part of a secondary supporting member.

Description

The roadway surrounding rock secondary lets and all presses supporting and protection structure under the high-ground stress

Technical field

The utility model relates to a kind of supporting and protection structure of all pressing, and especially relates under a kind of high-ground stress the roadway surrounding rock secondary and lets and all press supporting and protection structure.

Background technology

Under high-ground stress; Behind the roadway excavation; There are characteristics such as big, the certainly steady time length of rock deformation, the support technology that needs employing " to soften the back earlier just " usually, promptly carrying out the lower anchor of early stage resistance earlier sprays the associating preliminary bracing; Allow country rock to produce certain radial displacement distortion, make surrouding rock stress obtain release to a certain degree; Treat the tunnel unload compressive strain basicly stable after, carry out the secondary yield supporting again, destroy with the excessive deformation that prevents country rock, its concrete measure comprises contractibility steel bow member and reserves the gentle layer supporting of firm crack.But the engineering practice of a large amount of deep tunnel surrounding rock supportings shows; At the connecting bolt place of contractibility steel bow member or the connector position between rigid layer and the flexible layer very easily produce contact stress and concentrate; Can not realize evenly letting pressure; Make steel bow member or reserve firm gap structure and very easily produce and non-ly all claim yield deformation, thereby cause the integral body of secondary supporting system to be destroyed.

Thereby; In the actual use, existing secondary yield supporting structure exists that the support unit installation workload is big, maintenance cost is high, under high-ground stress, receive technology and economic restriction can not realize evenly letting multiple practical problems such as pressures, relatively poor, the unsuitable large tracts of land popularization of supporting effect employing.

The utility model content

The utility model technical problem to be solved is to above-mentioned deficiency of the prior art; Provide under a kind of high-ground stress the roadway surrounding rock secondary let and all press supporting and protection structure; Its reasonable in design, easy construction, input cost is low and result of use good; Can realize evenly letting pressure, effectively avoid concentrating the position and produced the secondary supporting structural entity unstable phenomenon that yield deformation causes because of the secondary supporting component stress.

For solving the problems of the technologies described above; The technical scheme that the utility model adopts is: the roadway surrounding rock secondary lets and all presses supporting and protection structure under a kind of high-ground stress; It is characterized in that: comprise along the tunnel bearing of trend be laid in excavate in the tunnel and to the excavation tunnel carry out the steel bow member of full section supporting, the soft backfill layer formed by the elastomeric material that is filled between steel bow member and the roadway excavation interface and along the tunnel bearing of trend be laid in excavate a plurality of full section supporting mechanism on the drift section; Said full section supporting and protection structure comprise be laid in excavate on the drift section and the full section bolt support system formed by a plurality of anchor poles be laid in excavate on the drift section and, be provided with the preset clearance that is used to lay soft backfill layer between said steel bow member and the roadway excavation interface by the full section cable bolting system that a plurality of anchor cables are formed.

The roadway surrounding rock secondary lets and all presses supporting and protection structure under the above-mentioned high-ground stress, it is characterized in that: said preset clearance is a thickness C p=k pThe gap of a, wherein k pFor reserving coefficient and k p=0.05~0.1, a by the section width in excavation tunnel.

The roadway surrounding rock secondary lets and all presses supporting and protection structure under the above-mentioned high-ground stress, it is characterized in that: comprise that also along tunnel bearing of trend is laid in a plurality of borings of the tunnel bottom central of excavating, said boring is vertically to laying.

The roadway surrounding rock secondary lets and all presses supporting and protection structure under the above-mentioned high-ground stress, it is characterized in that: a plurality of said full section supporting mechanism is even laying, and a plurality of said boring is even laying.

The roadway surrounding rock secondary lets and all presses supporting and protection structure under the above-mentioned high-ground stress, it is characterized in that: the spacing between adjacent two said full section supporting mechanisms is identical with the spacing between adjacent two said borings; And the installation position of a plurality of said borings is corresponding one by one with the installation position of a plurality of said full section supporting mechanism.

The roadway surrounding rock secondary lets and all presses supporting and protection structure under the above-mentioned high-ground stress, it is characterized in that: said soft backfill layer is foam concrete backfill layer, expanded clay backfill layer, slag backfill layer or sand backfill layer.

The roadway surrounding rock secondary lets and all presses supporting and protection structure under the above-mentioned high-ground stress, it is characterized in that: said soft backfill layer comprises by the packed layer that is filled in the said preset clearance and inner a plurality of packaging bags that elastomeric material is housed are formed.

The roadway surrounding rock secondary lets and all presses supporting and protection structure under the above-mentioned high-ground stress, it is characterized in that: said soft backfill layer also comprises the concrete enclosing layer that is formed by the concrete that is injected on the said packed layer external surface.

The roadway surrounding rock secondary lets and all presses supporting and protection structure under the above-mentioned high-ground stress, it is characterized in that: the thickness of said concrete enclosing layer is 5mm~10mm.

The utility model compared with prior art has the following advantages:

1, reasonable in design, construction sequence are simply, realization is convenient and input cost is low.

2, exempt from maintenance, required maintenance cost significantly reduces.

3, easy construction, in view of the rheological behavior of country rock behind the roadway excavation, for guaranteeing the back drift section headroom size that comes into operation, the suitable extension of its outer contour during roadway excavation, its extension size is the size of preset clearance between steel bow member and the surrounding rock consolidation layer.

4, result of use is good and practical value is high; The utility model is based on medium Load Transfer principle; Through consuming energy behind preset clearance and the filling elastomeric material between country rock surface and the steel bow member, form organic bearing structure of steel bow member, soft backfill layer, surrounding rock consolidation layer and deep wall rock, high-ground stress is transferred to deep wall rock; Combine simultaneously, form complete country rock secondary and let and all press supporting and protection structure with the release of holing of anchor pole and cable bolting structure and base plate.With existing contractibility steel bracket with reserve firm crack gentle layer supporting and protection structure and compare, the utlity model has advantages such as being convenient to set up, exempting from maintenance, workload are little, cost, can satisfy the surrounding rock supporting requirement under the coal mine roadway high-ground stress complex conditions of deep.

In sum; The utility model reasonable in design, easy construction, input cost is low and result of use good; The excessive deformation that is mainly used in roadway surrounding rock under the complex conditions that control is principal character with the high-ground stress destroys; Can realize evenly letting pressure, effectively avoid concentrating the position and produced the secondary supporting structural entity unstable phenomenon that yield deformation causes because of the secondary supporting component stress.

Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.

Description of drawings

Fig. 1 by the utility model the power consumption principle schematic of the soft backfill layer of employing.

Fig. 2 by the utility model the installation position sketch map of the soft backfill layer of employing.

Fig. 3 is the structural representation of the utility model.

Description of reference numerals:

1-roadway excavation interface; The soft backfill layer of 2-; 3-steel bow member;

4-boring; The 5-anchor pole; The 6-anchor cable.

The specific embodiment

Like Fig. 2, shown in Figure 3; The utility model comprise along the tunnel bearing of trend be laid in excavate in the tunnel and to the excavation tunnel carry out the steel bow member 3 of full section supporting, the soft backfill layer 2 formed by the elastomeric material that is filled between steel bow member 3 and the roadway excavation interface 1 and along the tunnel bearing of trend be laid in excavate a plurality of full section supporting mechanism on the drift section; Said full section supporting and protection structure comprise be laid in excavate on the drift section and the full section bolt support system formed by a plurality of anchor poles 5 be laid in excavate on the drift section and, be provided with the preset clearance that is used to lay soft backfill layer 2 between said steel bow member 3 and the roadway excavation interface 1 by the full section cable bolting system that a plurality of anchor cables 6 are formed.

In the present embodiment, said preset clearance is a thickness C p=k pThe gap of a, wherein k pFor reserving coefficient and k p=0.05~0.1, a by the section width in excavation tunnel.

Simultaneously, the utility model comprises that also along tunnel bearing of trend is laid in a plurality of borings 4 of the tunnel bottom central of excavating, and said boring 4 is vertically to laying.

During practice of construction, a plurality of said full section supporting mechanism is even laying, and a plurality of said boring 4 is even laying.In the present embodiment, the spacing between adjacent two said full section supporting mechanisms is identical with the spacing between adjacent two said borings 4; And the installation position of a plurality of said borings 4 is corresponding one by one with the installation position of a plurality of said full section supporting mechanism.

Said soft backfill layer 2 is foam concrete backfill layer, expanded clay backfill layer, slag backfill layer or sand backfill layer.

In the present embodiment, said soft backfill layer 2 comprises by the packed layer that is filled in the said preset clearance and inner a plurality of packaging bags that elastomeric material is housed are formed.

Simultaneously, said soft backfill layer 2 also comprises the concrete enclosing layer that is formed by the concrete that is injected on the said packed layer external surface.In the present embodiment, the thickness of said concrete enclosing layer is 5mm~10mm.

According to force analysis, pressure from surrounding rock is relevant with stratum media at the value of direction of transfer, and the big force value of rigidity is big, and the little force value of rigidity is also little.In conjunction with Fig. 1; Adopt the medium load transfer mechanism of soft backfill layer 2 to analyze and to know to the utility model; Because the rigidity of surrounding rock consolidation layer and deep wall rock is much larger than the rigidity of soft backfill layer 2; Thereby when pressure from surrounding rock with stress can form when passing soft backfill layer 2, the fillers in the soft backfill layer 2 can produce a large amount of stress of bigger distortion and corresponding consumption can, thereby make the load that is delivered on the steel bow member 3 reduce significantly.Generally speaking, the energy value that soft backfill layer 2 absorbs is the area of dash area among Fig. 1, promptly A represents stretch section among Fig. 1, and b represents the plasticity section, c representative sclerosis section, (E nTotal energy value for soft backfill layer absorption; σ is the unitstress of soft backfill layer material; ε is the unit strain of soft backfill layer material).Simultaneously, the two dimensional stress state after soft backfill layer 2 makes surface, tunnel country rock by excavation reverts to three-dimensional stress state, and the country rock self-bearing capacity is greatly improved, and steel bow member 3 then mainly plays the effect of stablizing soft backfill layer and country rock.

To sum up; The utility model adopts the composite construction system at four media, three interfaces of deep rock mass, surrounding rock consolidation layer, soft backfill layer 2 and 3 formation of steel bow member; Radial load finally is broken down into four major parts, and promptly the steel bow member carries, soft backfill layer carries, the surrounding rock consolidation layer carries and deep wall rock carries.Because being carried on the value much larger than the carrying of soft backfill layer 2 and steel bow member 3 of surrounding rock consolidation layer and deep wall rock, at this moment, the country rock self-bearing capacity is able to give full play to, and soft backfill layer material mainly contains foam concrete, expanded clay, slag and sand etc.As far as a large amount of provisional mine development headings; Slag as soft backfill layer material not only efficiently but also economical; In the concrete work progress; High-intensity polybag capable of using seals in the preset clearance of filling between steel bow member 3 and country rock of back slag, and the concrete that sprays 5~10mm seals.During practice of construction, slag must encapsulate back filling preset clearance, and agents enhance overall property prevents the slag phenomenon, and seals at its jet surface concrete.Simultaneously, during practice of construction, should strengthen preliminary bracing, carry out slip casting in case of necessity and hang net, prevent its excessive deformation and destroy, be the secondary yield supporting construction in the later stage condition that facilitates country rock.

The above; It only is the preferred embodiment of the utility model; Be not that the utility model is done any restriction; Everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of the utility model technical scheme according to the utility model technical spirit.

Claims (9)

1. the roadway surrounding rock secondary lets and all presses supporting and protection structure under the high-ground stress; It is characterized in that: comprise along the tunnel bearing of trend be laid in excavate in the tunnel and to the excavation tunnel carry out the steel bow member (3) of full section supporting, the soft backfill layer (2) formed by the elastomeric material that is filled between steel bow member (3) and roadway excavation interface (1) and along the tunnel bearing of trend be laid in excavate a plurality of full section supporting mechanism on the drift section; Said full section supporting and protection structure comprise be laid in excavate on the drift section and the full section bolt support system formed by a plurality of anchor poles (5) be laid in excavate on the drift section and, be provided with the preset clearance that is used to lay soft backfill layer (2) between said steel bow member (3) and roadway excavation interface (1) by the full section cable bolting system that a plurality of anchor cables (6) are formed.
2. let according to roadway surrounding rock secondary under the described high-ground stress of claim 1 and all press supporting and protection structure, it is characterized in that: said preset clearance is a thickness C p=k pThe gap of a, wherein k pFor reserving coefficient and k p=0.05~0.1, a by the section width in excavation tunnel.
3. let according to roadway surrounding rock secondary under claim 1 or the 2 described high-ground stress and all press supporting and protection structure, it is characterized in that: comprise that also along tunnel bearing of trend is laid in a plurality of borings (4) of the tunnel bottom central of excavating, said boring (4) is vertically to laying.
4. let according to roadway surrounding rock secondary under the described high-ground stress of claim 3 and all press supporting and protection structure, it is characterized in that: a plurality of said full section supporting mechanism is even laying, and a plurality of said boring (4) is even laying.
5. let according to roadway surrounding rock secondary under the described high-ground stress of claim 4 and all press supporting and protection structure, it is characterized in that: the spacing between adjacent two said full section supporting mechanisms is identical with the spacing between adjacent two said borings (4); And the installation position of a plurality of said borings (4) is corresponding one by one with the installation position of a plurality of said full section supporting mechanism.
6. let according to roadway surrounding rock secondary under claim 1 or the 2 described high-ground stress and all press supporting and protection structure, it is characterized in that: said soft backfill layer (2) is foam concrete backfill layer, expanded clay backfill layer, slag backfill layer or sand backfill layer.
7. let according to roadway surrounding rock secondary under claim 1 or the 2 described high-ground stress and all press supporting and protection structure, it is characterized in that: said soft backfill layer (2) comprises by the packed layer that is filled in the said preset clearance and inner a plurality of packaging bags that elastomeric material is housed are formed.
8. let according to roadway surrounding rock secondary under the described high-ground stress of claim 7 and all press supporting and protection structure, it is characterized in that: said soft backfill layer (2) also comprises the concrete enclosing layer that is formed by the concrete that is injected on the said packed layer external surface.
9. let according to roadway surrounding rock secondary under the described high-ground stress of claim 8 and all press supporting and protection structure, it is characterized in that: the thickness of said concrete enclosing layer is 5mm~10mm.
CN2011204901865U 2011-11-30 2011-11-30 Secondary yielding uniform pressure supporting structure of roadway surrounding rock under high ground stress CN202325548U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102787849A (en) * 2012-08-28 2012-11-21 江苏建筑职业技术学院 Deep coal mine tunnel with pressure yielding function
CN102852533A (en) * 2012-10-18 2013-01-02 山东大学 High-strength three-dimensional support system of yielding type restriction concrete lagging jack
CN104121025A (en) * 2014-06-11 2014-10-29 华北水利水电大学 Combined supporting method for resisting impact ground pressure
CN105114099A (en) * 2015-09-15 2015-12-02 内蒙古伊泰广联煤化有限责任公司 Poorly consolidated formation roadway support method and system
CN105422130A (en) * 2014-06-08 2016-03-23 衢州市优德工业设计有限公司 Method for regulating supporting pressure to carry out roadway surrounding rock supporting

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102787849A (en) * 2012-08-28 2012-11-21 江苏建筑职业技术学院 Deep coal mine tunnel with pressure yielding function
CN102852533A (en) * 2012-10-18 2013-01-02 山东大学 High-strength three-dimensional support system of yielding type restriction concrete lagging jack
CN105422130A (en) * 2014-06-08 2016-03-23 衢州市优德工业设计有限公司 Method for regulating supporting pressure to carry out roadway surrounding rock supporting
CN105422130B (en) * 2014-06-08 2017-06-13 衢州市优德工业设计有限公司 It is a kind of to adjust the method that supporting pressure carries out supporting roadway surrounding rock
CN104121025A (en) * 2014-06-11 2014-10-29 华北水利水电大学 Combined supporting method for resisting impact ground pressure
CN105114099A (en) * 2015-09-15 2015-12-02 内蒙古伊泰广联煤化有限责任公司 Poorly consolidated formation roadway support method and system
CN105114099B (en) * 2015-09-15 2018-03-27 内蒙古伊泰广联煤化有限责任公司 A kind of weak consolidated formation laneway support method and support system

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C17 Cessation of patent right
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Granted publication date: 20120711

Termination date: 20121130