CN103291328A - Swelling rock roadway bottom plate treatment method - Google Patents
Swelling rock roadway bottom plate treatment method Download PDFInfo
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- CN103291328A CN103291328A CN2013102666686A CN201310266668A CN103291328A CN 103291328 A CN103291328 A CN 103291328A CN 2013102666686 A CN2013102666686 A CN 2013102666686A CN 201310266668 A CN201310266668 A CN 201310266668A CN 103291328 A CN103291328 A CN 103291328A
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Abstract
The invention discloses a swelling rock roadway bottom plate treatment method. The swelling rock roadway bottom plate treatment method comprises the steps of: sequentially paving a steel wire mesh, a reinforcing steel bar ladder beam, a bottom plate supporting angle anchor rod, a support plate compressing reinforcing steel bar ladder beam, and a reinforcing steel ladder beam compressing steel wire mesh on the roadway bottom plate after the roadway construction; then paving a sand and gravel layer on the reinforcing steel bar ladder beam, pouring a steel wire mesh concrete layer on the sand and gravel layer, pre-burying a short grouting pipe in the steel wire mesh concrete layer while the pouring, and enabling the bottom of the grouting pipe to enter into the sand and gravel layer; and finally, arranging a sidewall supporting angle anchor rod above the steel wire mesh concrete layer so as to realize the treatment on the swelling rock roadway bottom plate. The swelling rock roadway bottom plate treatment method provides a certain pressing stress for the swelling rock on the bottom plate, removes a swelling deformation amount during the roadway swelling rock bottom plate treatment period, and avoids parietal fissure of the steel wire mesh concrete layer.
Description
Technical field
The present invention relates to a kind of expansive rock roadway floor improvement method.
Background technology
Along with the increase of the coal mining degree of depth, the part mine working presents that large deformation, the earth are pressed, the remarkable plastic strain destructive characteristics of difficult supporting, and the floor lift in gallery phenomenon often takes place roadway floor, and that roadway floor is the situation of expansive rock is especially outstanding.At present, the control device of floor lift in gallery mainly contains two kinds, and a kind of is to improve the country rock bearing strength, comprises floor grouting, base plate anchor pole, closed supports and concrete anti-arch etc.; Another kind is to reduce surrouding rock stress, comprises base plate grooving, tunnel grooving etc.But because expansive rock has water-swellable, along with the aggravation of roadway floor distortion, the crack is to the base plate depth development, the same water-swellable of deep expansive rock, as long as there is the crack passage, the expansion of expansive rock is just more than.All distortion of uncontrollable expansive rock base plate of major technique means of existing control floor lift in gallery.Therefore, design a kind of drift section utilization rate that can guarantee and to reduce the expansive rock roadway floor improvement method of expansive rock roadway floor treatment cost again, can improve expansive rock roadway floor supporting efficient greatly, guarantee colliery highly effective and safe production.
Summary of the invention
For solving above-mentioned defective of the prior art, the invention provides a kind of method of effective improvement expansive rock roadway floor.
For the technical scheme that solves the problems of the technologies described above is: a kind of expansive rock roadway floor improvement method the steps include:
1) determines sand pebble layer thickness, steel-wire-net reinforced concrete layer thickness according to design section parameter and the country rock mechanics parameter in tunnel, determine the driving height then, begin driving; Described driving is highly added 0.05m ~ 0.2m for the design clear height in tunnel and sand pebble layer thickness and steel-wire-net reinforced concrete layer thickness sum.
2) after the tunnelling, roadway floor is cleared up smooth, laid gauze wire cloth, press the reinforcing bar ladder beam at gauze wire cloth, bore bottom bolthole and a base corner anchor pole at roadway floor, press supporting plate and fix with nut at the reinforcing bar ladder beam.
3) above the reinforcing bar ladder beam set by step 1) the sand pebble layer thickness determined is real with the sand pebble layer shop, and help to bore portion of group bolthole, portion of a group angle anchor pole two; The boring length of exposing of portion of described group angle anchor pole is added 0.05m ~ 0.2m length afterwards greater than the determined steel-wire-net reinforced concrete layer thickness of step 1).
4) build the steel-wire-net reinforced concrete layer above the described sand pebble layer of step 3), building thickness is determined steel-wire-net reinforced concrete layer thickness in the step 1); When building, pre-buried Grouting Pipe in the steel-wire-net reinforced concrete layer, sand pebble layer is inserted in the Grouting Pipe bottom; After treating that the steel-wire-net reinforced concrete layer reaches 7 days age strengths, press supporting plate and fix with nut at steel-wire-net reinforced concrete layer upper surface.
Further, described expansive rock roadway floor is administered method step 1) in driving highly add 0.1m for the design clear height in tunnel and sand pebble layer thickness and steel-wire-net reinforced concrete layer thickness sum.
Further, the boring length of exposing of portion of group angle anchor pole is added 0.1m length afterwards greater than the determined steel-wire-net reinforced concrete layer thickness of step 1) described expansive rock roadway floor improvement method step 3).
The invention has the beneficial effects as follows: the base corner anchor pole after the tunnelling is modified into the active support design, provide certain compressive stress to the base plate expansive rock, eliminate the dilatancy amount during tunnel expansive rock base plate is administered, and can concentrate by balanced tunnel-surrounding stress the dilatancy amount of control tunnel viability.And the design of sand pebble layer can be eliminated the expansive rock dilatancy, and when the tunnel period of service expanded distortion, dilatancy was eliminated by the hole in the sand pebble layer, has avoided the top of steel-wire-net reinforced concrete layer to split.At last, the design of portion of group angle anchor pole has increased the globality that steel-wire-net reinforced concrete layer and tunnel two are helped, and can partly transfer to tunnel two by the expansion force that portion of group angle anchor pole bears the steel-wire-net reinforced concrete layer and help, and protection steel-wire-net reinforced concrete layer does not ftracture.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is that roadway floor reinforcing bar ladder beam of the present invention is arranged schematic diagram.
Among the figure: 1, tunnel, 2, the base plate expansive rock, 3, the base corner anchor pole, 4, gauze wire cloth, 5 sand pebble layers, 6, the steel-wire-net reinforced concrete layer, 7, the reinforcing bar ladder beam, 8, portion of group angle anchor pole, 9, short Grouting Pipe, 10, supporting plate, 11, nut, 12, supporting plate, 13, nut.
The specific embodiment
The present invention is described in detail below in conjunction with attached Fig. 1 and 2 and embodiment.
As shown in Figure 1, a kind of expansive rock roadway floor improvement method the steps include:
1) determines sand pebble layer, steel-wire-net reinforced concrete layer thickness according to design section parameter and the country rock mechanics parameter in tunnel, determine the driving height then, begin driving; Described driving is highly added 0.1m for the design clear height in tunnel and sand pebble layer thickness and steel-wire-net reinforced concrete layer thickness sum.
2) after the tunnelling, the cleaning of tunnel 1 base plate is smooth, lay gauze wire cloth 4, press reinforcing bar ladder beam 7 at gauze wire cloth 4, bottom bolthole and a base corner anchor pole 3 are bored in 1 base plate both sides in the tunnel, press supporting plate 12 and fixing with nut 13 at reinforcing bar ladder beam 7.Base corner anchor pole 3, gauze wire cloth 4 and reinforcing bar ladder beam 7 constitute the measure of roadway floor active support, above-mentioned active support measure is for 1 driving back provides certain compressive stress to base plate expansive rock 2 in the tunnel, eliminate the dilatancy amount during tunnel 1 expansive rock base plate is administered, and balanced tunnel 1 edge stress is concentrated the dilatancy amount of control tunnel 1 viability.
3) above reinforcing bar ladder beam 7 set by step 1) the sand pebble layer thickness determined is real with the sand pebble layer shop, and help to bore respectively portion of group bolthole, portion of a group angle anchor pole 8 two; Portion of described group angle anchor pole 8 is to prop up in advance when construction steel-wire-net reinforced concrete layer 6, and the boring length of exposing of portion of described group angle anchor pole is added 0.1m length afterwards greater than the determined steel-wire-net reinforced concrete layer thickness of step 1).Above-mentioned steps namely is after the active support measure arranges, above reinforcing bar ladder beam 7 that sand pebble layer 5 shops are real, because sand pebble layer 5 has bigger void ratio, when 1 period of service expanded distortion in the tunnel, hole in the sand pebble layer 5 is at first by densification, it also is the layer of concrete 6 that the expansion force of base plate expansive rock 2 can not be delivered to sand pebble layer 5 tops by sand pebble layer 5, avoid the top of steel-wire-net reinforced concrete layer 6 to split, finally avoided tunnel ponding by steel-wire-net reinforced concrete layer 6 crack, sand pebble layer 5, expansive rock 2 cracks enter expansive rock 2 inside and cause new dilatancy.The effect of portion of group angle anchor pole 8 is to connect two of steel-wire-net reinforced concrete layer 6 and tunnel 1 to help; be convenient to be helped by two of steel-wire-net reinforced concrete layer 6 and tunnel 1 when sand pebble layer 5 can't be eliminated the expansion force of base plate expansive rock 2 the unnecessary expansion force of common weight tray expansive rock 2, protection steel-wire-net reinforced concrete layer 6 does not ftracture.
4) above the described sand pebble layer of step 3), build steel-wire-net reinforced concrete layer 6, when building, pre-buried short Grouting Pipe 9 in the steel-wire-net reinforced concrete layer 6, sand pebble layer 5 is inserted in short Grouting Pipe 9 bottoms, after treating that steel-wire-net reinforced concrete layer 6 reaches 7 days age strengths, press supporting plate 10 and fixing with nut 11 at steel-wire-net reinforced concrete layer 6 upper surface.
Described short Grouting Pipe 9 is passages of 1 floor grouting to the tunnel, when steel-wire-net reinforced concrete layer 6 cracking take place when, for the generation that prevents distension at the bottom of the later stage needs toward tunnel 1 floor grouting, when can avoiding the later stage to floor grouting, the existence of short Grouting Pipe 9 holes, simplify the operation of later stage roadway maintenance, reduced maintenance cost.
Claims (3)
1. an expansive rock roadway floor improvement method the steps include:
1) determines sand pebble layer thickness, steel-wire-net reinforced concrete layer thickness according to design section parameter and the country rock mechanics parameter in tunnel, determine the driving height then, begin driving; Described driving is highly added 0.05m ~ 0.2m for the design clear height in tunnel and sand pebble layer thickness and steel-wire-net reinforced concrete layer thickness sum;
2) after the tunnelling, roadway floor is cleared up smooth, laid gauze wire cloth, press the reinforcing bar ladder beam at gauze wire cloth, bore bottom bolthole and a base corner anchor pole at roadway floor, press supporting plate and fix with nut at the reinforcing bar ladder beam;
3) above the reinforcing bar ladder beam set by step 1) the sand pebble layer thickness determined is real with the sand pebble layer shop, and help to bore portion of group bolthole, portion of a group angle anchor pole two; The boring length of exposing of portion of described group angle anchor pole is added 0.05m ~ 0.2m length afterwards greater than the determined steel-wire-net reinforced concrete layer thickness of step 1);
4) build the steel-wire-net reinforced concrete layer above the described sand pebble layer of step 3), building thickness is determined steel-wire-net reinforced concrete layer thickness in the step 1); When building, pre-buried Grouting Pipe in the steel-wire-net reinforced concrete layer, sand pebble layer is inserted in the Grouting Pipe bottom; After treating that the steel-wire-net reinforced concrete layer reaches 7 days age strengths, press supporting plate and fix with nut at steel-wire-net reinforced concrete layer upper surface.
2. expansive rock roadway floor improvement method as claimed in claim 1 is characterized in that: the driving in the step 1) is highly added 0.1m for the design clear height in tunnel and sand pebble layer thickness and steel-wire-net reinforced concrete layer thickness sum.
3. expansive rock roadway floor improvement method as claimed in claim 1 is characterized in that: the boring length of exposing of portion of group angle anchor pole is added length after the 0.1m greater than the determined steel-wire-net reinforced concrete layer thickness of step 1) in the step 3).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103527221A (en) * | 2013-10-24 | 2014-01-22 | 中南大学 | Bottom plate steel tube beam for mine deep portion supporting project and application method thereof |
| CN104500099A (en) * | 2014-11-25 | 2015-04-08 | 安徽理工大学 | Treatment method for colliery roadway floor heaves |
| CN105201525A (en) * | 2015-10-19 | 2015-12-30 | 河南理工大学 | Repairable bottom heave control method |
| CN109139057A (en) * | 2018-10-29 | 2019-01-04 | 六盘水师范学院 | A kind of coal cutting roadway bottom plate water suction pucking administering method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103527221A (en) * | 2013-10-24 | 2014-01-22 | 中南大学 | Bottom plate steel tube beam for mine deep portion supporting project and application method thereof |
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| CN105201525A (en) * | 2015-10-19 | 2015-12-30 | 河南理工大学 | Repairable bottom heave control method |
| CN105201525B (en) * | 2015-10-19 | 2017-09-12 | 河南理工大学 | A kind of recoverable preventing and treating pucking method |
| CN109139057A (en) * | 2018-10-29 | 2019-01-04 | 六盘水师范学院 | A kind of coal cutting roadway bottom plate water suction pucking administering method |
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| CN103291328B (en) | 2015-05-13 |
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