CN210977516U - A scour protection energy release composite support structure for rock burst mine tunnel - Google Patents
A scour protection energy release composite support structure for rock burst mine tunnel Download PDFInfo
- Publication number
- CN210977516U CN210977516U CN201922192991.9U CN201922192991U CN210977516U CN 210977516 U CN210977516 U CN 210977516U CN 201922192991 U CN201922192991 U CN 201922192991U CN 210977516 U CN210977516 U CN 210977516U
- Authority
- CN
- China
- Prior art keywords
- concrete
- grout
- rock
- tunnel
- rock burst
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model relates to an anti-impact energy-release composite supporting structure for rock burst mine tunnel, which adopts the technical proposal that a supporting structure is arranged on the tunnel outline, the supporting structure comprises a concrete primary spraying layer covered on the surface of surrounding rocks, anchor rods, anchor cables and pressure relief holes which are radially arranged and extend towards the surrounding rocks are arranged on the concrete primary spraying layer, the inner surface of the concrete primary spraying layer is covered with a concrete secondary spraying layer, a grouting body is injected in the pressure relief holes close to one end of the concrete secondary spraying layer, the grouting body is provided with a grouting body, a foam grouting body and a fiber cement-based grouting body from the concrete secondary spraying layer outwards in sequence, the structure of the utility model not only allows the surrounding rocks of the tunnel to be deformed to a certain degree, releases partial surrounding rock pressure, but also can provide enough large supporting strength, limits the further deformation of the surrounding rocks of the tunnel, realizes the integrated design of 'strong-weak-strong', the overall stability of the surrounding rock supporting structure is improved.
Description
One, the technical field
The utility model relates to a colliery is support technical field in the pit, especially a scour protection energy release composite support structure for rock burst mine tunnel.
Second, background Art
Along with the increase of the mining depth and the mining intensity of coal resources in China, coal rock dynamic disasters caused by rock burst are gradually aggravated. The rock burst has the characteristics of sudden, instantaneous vibration, huge destructiveness and the like, and releases a large amount of energy to cause the failure and destruction of a roadway supporting structure. When the mining depth of the mine is below 1000m, the hard rock also presents soft rock rheological characteristics. 1, 12 of Fuxin Wulong coal mine causes 36 dead people with negative injuries due to rock burst accidents, the damaged roadway exceeds 300m, and the direct economic loss exceeds hundred million yuan; the collision accidents of 8.6 and 8.11 of the Henan artificial horse jumping into the coal mine respectively cause the deformation and the damage of roadways of 400m and 360m, and a large number of O-shaped sheds are damaged; the '11.3' rock burst accident of the artificial thousand autumn coal mine causes 10 deaths due to serious crushing of the roadway, the 380m roadway is seriously damaged, and the roadway with a section of nearly one hundred meters is basically closed. For deep rock burst roadway maintenance, the single support column can be squeezed down or knocked down by the caving of the coal seam or the throwing of the coal blocks when rock burst occurs; the instantaneous violent loading caused by the violent vibration of the top plate and the bottom plate can crush the support columns and the supports, the deformation of surrounding rocks is large, the damage is serious, an anchor rod (cable) support system is seriously damaged, the anchor rod (cable) is thrown out, the metal mesh is broken, the support columns and the supports are seriously deformed and bent, and the serious casualties and economic loss are caused. The properties of the coal rock mass in the deep part are obviously different from those of the coal rock mass in the shallow part, the mechanical behavior of the coal rock mass is nonlinear, and the deformation of the rock mass shows brittle-ductile transformation characteristics, rheological characteristics and capacity expansion properties. The adopted supporting structure has become an important subject to be solved urgently in the mine roadway support of rock burst.
In the process of deep mine exploitation, geological conditions are complex and variable, and the influence of rock burst dynamic disasters causes serious tunnel deformation and even scrapping (bottom bulging is serious, two side walls and a top plate collapse), a plurality of tunnels need to be maintained for many times, normal production of a mine cannot be guaranteed, and the tunnel management must be in accordance with the principle of combining yielding and pressure resistance. At present, the method is more used in the aspect of roadway support of rock burst mines or is a more original support method. Most of rock burst mines are in the deep mining stage, the stress of the deep part of the mine is large, the geological structure is complex, and the problem of impact is increasingly prominent. Therefore, aiming at the supporting problem of the rock burst roadway, some high-strength roadway hydraulic supports, particularly special hydraulic supports, begin to appear in partial rock burst mines in sequence. Adopt tunnel buttress formula hydraulic support, from moving formula hydraulic support increase tunnel support intensity in a large number if the rock burst mine, improve and strut the system shock resistance ability to deal with the tunnel rock burst problem. In recent years, various portal hydraulic supports are also applied to mine roadways with relatively serious rock burst, and the portal hydraulic supports are very obvious for improving the supporting strength and the impact resistance of the roadways. Because the hydraulic upright post is completely different in static load and impact load properties, the pressure borne by the upright post under the static load can open the safety valve to discharge liquid and release pressure once the pressure exceeds the working resistance of the hydraulic upright post, the hydraulic upright post is flexible, and once the hydraulic upright post is impacted axially, the load is increased instantly, the safety valve cannot open the liquid to discharge liquid immediately, and the upright post is rigid. Therefore, the bracket can still resist smaller impact, and larger impact can cause sudden deformation and damage of the bracket, and the support column is bent, and breaks a cylinder or damages the sealing ring, the safety valve, the guide sleeve and the like, so that the bracket loses the supporting capability. The door type hydraulic support is rigid under impact, does not have the performance of rapid yielding and energy absorption, and is the root cause of damage. Therefore, the portal hydraulic support can fundamentally solve the problem that the rock burst damages the roadway only by improving the support strength and enhancing the impact resistance of the support system, namely avoiding the deformation and the damage of the support under the action of large rock burst, and having the characteristics of dynamic abdication and energy absorption.
Based on this, scientific research personnel have developed the research of the energy-absorbing scour protection component of scour protection hydraulic support: foamed aluminum formula energy-absorbing scour protection component, hole enlargement formula and upset limit formula energy-absorbing scour protection component, have polygonal tubular energy-absorbing scour protection component and the inside novel hydraulic support energy-absorbing scour protection component etc. of arranging the floor of circular thin wall pipe of folded grain in advance, its structure is complicated, and deformation energy-absorbing process will be higher to the precision, and the reliability is relatively poor, is difficult to practical application complicated violent impact condition. When the rock burst happens, the quick unloading capacity of a safety valve installed on an anti-impact hydraulic stand column cannot meet the requirement of impact force, and the unloading capacity is insufficient, so that the pressure in the hydraulic stand column rises sharply, and overload damage is caused, such as support inclination, toppling, pin shaft shearing, top beam falling, stand column bending or breaking and the like.
The disadvantages are that: the prior supporting technology is as follows: the combined supporting technology of anchor nets, anchor ropes and I-shaped steel arched supports, the O-shaped shed closed supporting technology and the anchor rod, metal nets, concrete spraying and O-shaped steel shed composite supporting technology belong to flexible supporting, the compressive strength is insufficient, the absorbed energy is limited, the occurrence of rock burst can cause the serious damage of an anchor rod (cable) supporting system, the anchor rod (cable) is thrown out, and the metal nets are broken; the energy-absorbing impact-proof component of the novel impact-proof hydraulic support has poor adaptability of an energy-absorbing structure and does not have the performance of rapid yielding and energy absorption; once the rock burst occurs, the deformation of the support post and the support cannot be rapidly deformed, so that the supporting structure is bent and broken, and the top plate falls off in a large area. Therefore, improvement and innovation thereof are imperative.
Third, the invention
To the above situation, for overcoming the defect of prior art, the utility model aims at providing a prevent scour protection release can composite support structure for rock burst mine tunnel can effectively solve the problem that rock burst mine tunnel strutted.
The utility model provides a technical scheme is, a scour protection energy release composite support structure for rock burst mine tunnel, including the tunnel, be provided with supporting construction on the tunnel profile, supporting construction just spouts the layer including covering the concrete on country rock surface, has been beaten on the concrete just spouts the layer towards the country rock orientation extension, is radial stock, anchor rope and the release hole of arranging, and the concrete just spouts the layer internal surface and covers and has the concrete to spout the layer again, and the injection has the slip casting body in the release hole that is close to concrete to spout layer one end again, and the slip casting body plays from the concrete to spout the layer outwards be grout slip casting body, foam cement thick liquid slip casting body and fibre cement base thick liquid slip casting body in proper order.
The utility model discloses novel structure is unique, it is simple reasonable, stable in structure, let the pressure through the comprehensive consideration, the resistance to compression characteristics, both let tunnel country rock have the certain degree to warp, release part country rock pressure, can provide enough big support intensity again, restriction tunnel country rock further deformation, realize "strong-weak-strong" integrated design, country rock supporting construction overall stability has been improved, this kind of supporting construction stability is good, reliable degree is high, weak time consuming, and it jointly uses with other support forms in soft rock tunnel, can effectively control tunnel country rock deformation, guarantee tunnel overall stability, reduce rock burst to tunnel supporting construction's destruction, be the innovation on the rock burst mine tunnel supporting construction, good society and economic benefits have.
Description of the drawings
Fig. 1 is a sectional view of the present invention.
Fig. 2 is a partially enlarged view of a portion a in fig. 1 according to the present invention.
Fig. 3 is a schematic structural view of the filling body in the pressure relief hole of the present invention.
Fifth, detailed description of the invention
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.
By figure 1 to 3, the utility model discloses a tunnel 1 is provided with supporting construction in the 1 profile in tunnel, supporting construction is including covering the concrete primary spray layer 2 on country rock 10 surface, has been beaten on the concrete primary spray layer 2 towards the extension of country rock direction, is radial stock 3, anchor rope 9 and the release hole 4 of arranging, and the 2 internal surface covers in concrete primary spray layer has concrete secondary spray layer 8, and it has the grout body to be injected in the release hole 4 of 8 one ends in concrete secondary spray layer, and the grout body outwards is grout body 5, foam cement grout body 6 and fiber cement base thick liquid grout body 7 in proper order from concrete secondary spray layer.
In order to ensure the using effect, the lengths of the cement paste body 5, the foam cement paste body 6 and the fiber cement-based paste body 7 are all 1.5-2.5 m; preferably, the grout slurry 5, the foamed grout slurry 6 and the fiber cement-based slurry 7 are each 2.0m in length.
The axial line of the pressure relief holes 4 is vertical to the inner wall of the roadway, the aperture of each pressure relief hole is smaller than 300mm, the length of each pressure relief hole is 10-30m, the distance between inlets of two adjacent pressure relief holes is 3-5m, and reasonable diameter, length and distance can be selected according to the section size of the roadway and the requirements of the site.
The strength thickness of the concrete primary spraying layer 2 is 50 mm; the thickness of the concrete re-spraying layer 8 is 100 mm.
During construction, the method comprises the following steps:
(1) initial spraying
After the roadway is excavated, spraying concrete with the thickness of 50mm on the surface of the surrounding rock 10 to serve as a concrete primary spraying layer 2, wherein the strength of the concrete can be C20, and leveling the profile of the section of the roadway; the purpose is to seal the surrounding rock, prevent the weathering of the surrounding rock and the collapse of the surface dangerous rock, reduce the irregularity of the roadway surface, improve the close adhesion of the anchor rod tray and the surface of the surrounding rock, and improve the supporting effect of the anchor rod on the surrounding rock.
(2) One-time grouting
Injecting cement slurry into the surrounding rock, and reinforcing and crushing the surrounding rock at the initial stage; the grouting material can mainly be single-liquid cement slurry, the grouting cement adopts 425# ordinary portland cement, and the water cement ratio is 0.7-1.0; if the single-hole grouting pressure is small and the grouting amount is slightly large, 15-20% of fly ash in the amount of cement can be added into the single-liquid cement slurry to be uniformly stirred and injected, so that the material is saved and the cost is reduced.
(3) Combined support with initial anchor net
And (3) arranging anchor rods, wherein the anchor rods can be processed by IV-grade or V-grade left-handed thread steel without longitudinal bars for construction, the strength of rod body materials is not lower than 540MPa, and meanwhile, metal nets with the specifications of phi 6.5@150mm × 150mm are laid on the inner side surfaces of the roadways to form combined support of the initial anchor nets and reinforce the broken surrounding rocks.
(4) Drilling pressure relief holes
And drilling pressure relief holes 4 in the surrounding rock of the roadway, wherein the pressure relief holes are vertical to the wall of the roadway, the aperture of the pressure relief holes with small specifications is generally below 100mm, the aperture of the pressure relief holes with large specifications is 100 mm-300 mm, the drilling depth is 10-30m, the distance between the mouth parts of two adjacent pressure relief holes is 5-10 m, and reasonable diameter, length and distance can be selected according to the section size of the roadway and the field requirement.
(5) Injection of foamed cement slurry and fiber cement-based slurry
The fiber cement-based grout is injected into the pressure relief holes and solidified to form fiber cement-based grout grouting bodies (concretion bodies), then the foam grout is injected into the pressure relief holes and solidified to form foam grout grouting bodies (concretion bodies), the lengths of the fiber cement-based grout grouting bodies and the foam grout grouting bodies are controlled to be 1.5-2.5m, and simultaneously, 1.5-2.5m is reserved; foam cement slurry is injected to realize yielding, and the foam cement slurry is the prior art. Light foam cement slurries, such as those disclosed in the university of forestry science and technology, zhongnan university of forestry, proceedings 2011, 2 months, volume 31, phase 2, pages 82-84; the fiber cement-based slurry can enhance the toughness and the anti-impact performance of the surrounding rock of the roadway, and the fiber cement-based slurry is a publicly grouted fiber cement-based material in the prior art, such as the public grouted fiber cement-based material mentioned in journal of railroad science and engineering, 5.2018, 15 th volume, and 5 th phase, 1187 th page 1195, and preferably a grouted fiber cement-based material with the fiber parameter of 8 percent can be adopted. Not only creates a favorable deformation space for the deformation of the surrounding rock, but also has certain bearing capacity.
(6) Re-spraying
After the anchor cable 9 is installed, a 100mm concrete re-spraying layer 8 is sprayed on the surface layer of the roadway, the concrete strength can be C20, the sealing effect is achieved, and slurry leakage during secondary grouting is prevented.
(7) Secondary grouting
And grouting the full section of the roadway, injecting cement slurry into the rest part of the pressure relief hole, solidifying to form cement slurry grouting body 5 (a stone body), wherein the cement slurry is plain cement slurry, the grouting parameters comprise the length of a grouting hole of 1500mm, the spacing distance of 2000 × 2000mm, the grouting pressure of 2-3MPa and the grouting amount of 300kg per hole, the grouting effect can be adjusted on site, the anchor rope support forms a combined support, the surrounding rock is reinforced, and the impact resistance of the surrounding rock is enhanced.
The invention can be seen from the situation that the tunnel is initially sprayed on the wall of the tunnel and leveled; grouting once to reinforce and crush surrounding rocks and prevent dangerous rocks from falling; installing an anchor rod and a metal net to form a primary support; the pressure relief hole is formed by drilling the hole in the coal wall, so that the coal body cracks around the drilled hole are continuously expanded, the coal body is continuously damaged, the compression property of the coal body is continuously released, a pressure relief area with lower stress is formed around the pressure relief hole, and the high stress concentration area near the coal wall is transferred to the deep part of the coal body, so that the effect of preventing rock burst is achieved; injecting foam cement slurry and fiber cement-based slurry into the pressure relief holes, injecting the foam cement slurry to realize yielding, and injecting the fiber cement-based slurry to enhance the toughness and the anti-impact performance of the surrounding rock of the roadway; the re-spraying has a sealing effect, so that slurry leakage during grouting is prevented; and grouting the whole section and injecting cement slurry to the rest part of the pressure relief hole close to the roadway to reinforce the surrounding rock and enhance the anti-impact performance of the surrounding rock. The supporting structure perfectly realizes yielding and compression resistance, releases the elastic energy of the rock surrounding of the rock burst roadway, thereby playing a role in preventing and controlling rock burst, improving the overall stability of the supporting structure of the rock surrounding, and has the advantages of good stability, high reliability and short time consumption.
Claims (6)
1. The utility model provides a scour protection energy release composite support structure for rock burst mine tunnel, includes tunnel (1), its characterized in that is provided with supporting construction on tunnel (1) profile, supporting construction is including covering at the concrete primary spray layer (2) on country rock (10) surface, has been beaten on concrete primary spray layer (2) towards the extension of country rock direction, be radial anchor bolt (3), anchor rope (9) and relief pressure hole (4) of arranging, and concrete primary spray layer (2) internal surface covers there is concrete secondary spray layer (8), is close to and has injected into grout body in the relief pressure hole (4) of concrete secondary spray layer (8) one end, and grout body outwards is grout body (5), foam grout body (6) and fiber cement base grout body (7) in proper order from the concrete secondary spray layer.
2. The composite support structure for controlling energy release in mine tunnels against rock burst according to claim 1, characterized in that the length of the grout (5), the foam grout (6) and the fiber cement-based grout (7) is 1.5-2.5 m.
3. An anti-erosion and energy-release composite supporting structure for rock burst mine tunnels according to claim 1 or claim, wherein the grout (5), foam grout (6) and fibre cement based grout (7) are each 2.0m in length.
4. The anti-impact energy-release composite supporting structure for the rock burst mine roadway as claimed in claim 1 or the anti-impact energy-release composite supporting structure is characterized in that the axis of the pressure relief hole (4) is perpendicular to the inner wall of the roadway, the diameter of the pressure relief hole is less than 300mm, the length of the pressure relief hole is 10-30m, and the distance between the inlets of two adjacent pressure relief holes is 3-5 m.
5. The anti-impact energy-release composite supporting structure for rock burst mine roadway according to claim 1 or the claim, characterized in that the thickness of the strength of the concrete primary-spraying layer (2) is 50 mm.
6. The anti-impact energy-release composite supporting structure for rock burst mine roadway according to claim 1 or the claim, characterized in that the thickness of the concrete shotcrete layer (8) is 100 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922192991.9U CN210977516U (en) | 2019-12-10 | 2019-12-10 | A scour protection energy release composite support structure for rock burst mine tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922192991.9U CN210977516U (en) | 2019-12-10 | 2019-12-10 | A scour protection energy release composite support structure for rock burst mine tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210977516U true CN210977516U (en) | 2020-07-10 |
Family
ID=71415878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922192991.9U Expired - Fee Related CN210977516U (en) | 2019-12-10 | 2019-12-10 | A scour protection energy release composite support structure for rock burst mine tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210977516U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112554910A (en) * | 2020-12-04 | 2021-03-26 | 中煤科工开采研究院有限公司 | Grouting reinforcement method for roadway impacted by dynamic load |
| CN112922636A (en) * | 2021-03-01 | 2021-06-08 | 天地科技股份有限公司 | Surrounding rock support construction method for roadway |
| CN114738021A (en) * | 2022-03-29 | 2022-07-12 | 盾构及掘进技术国家重点实验室 | Large-deformation short anchor yielding supporting structure and method for high-ground-stress soft rock tunnel |
-
2019
- 2019-12-10 CN CN201922192991.9U patent/CN210977516U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112554910A (en) * | 2020-12-04 | 2021-03-26 | 中煤科工开采研究院有限公司 | Grouting reinforcement method for roadway impacted by dynamic load |
| CN112922636A (en) * | 2021-03-01 | 2021-06-08 | 天地科技股份有限公司 | Surrounding rock support construction method for roadway |
| CN112922636B (en) * | 2021-03-01 | 2023-11-17 | 天地科技股份有限公司 | Surrounding rock supporting construction method for roadway |
| CN114738021A (en) * | 2022-03-29 | 2022-07-12 | 盾构及掘进技术国家重点实验室 | Large-deformation short anchor yielding supporting structure and method for high-ground-stress soft rock tunnel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210977516U (en) | A scour protection energy release composite support structure for rock burst mine tunnel | |
| CN101603431B (en) | Method for reinforcing outburst-prone coal seam cross-cut coal uncovering | |
| CN102002956B (en) | Multi-level fully-closed reinforcement technology of exposed fault zone of excavated side slope | |
| CN103133026A (en) | Novel expansion shell inverted wedge type grouting anchor rod | |
| CN106523003A (en) | Rigid-flexible coupling energy absorbing support technology suitable for deep mining roadway | |
| CN106677804B (en) | A kind of gob side entry retaining roadside support system and its construction method | |
| CN106321113B (en) | A kind of lane space frame structure and its method for protecting support for being used to wear goaf | |
| CN110985079B (en) | Energy-absorbing impact-resistant roadway support method | |
| CN103912292A (en) | Fault-passing roadway waterproof damping and shock-resisting coupling support method | |
| CN203230443U (en) | Novel case expanding reverse wedging type slip casting anchor rod | |
| CN109404007A (en) | A kind of underground engineering support antiknock integration composite construction | |
| KANG et al. | Research progress on support technology and methods for soft rock with large deformation hazards in China | |
| CN110645018B (en) | Mine underground strong dynamic pressure roadway prestress anchor-charging integrated supporting structure and method | |
| CN207229125U (en) | A kind of thrust device for being exclusively used in concrete filled steel tube pier stud | |
| CN111379581B (en) | Deep roadway prestress full-anchor support construction equipment and construction method thereof | |
| CN110552723B (en) | Treatment construction method for continuous collapse roof fall of small-section steep slope tunnel | |
| CN210317324U (en) | Underground works struts antiknock integrated composite construction | |
| CN106761841A (en) | Working face tailgate fractured coal grouting reinforcement method | |
| CN104453914B (en) | The construction method of ingate anti-impact shock-absorbing supporting construction | |
| CN114086982A (en) | High ground stress fragmentation surrounding rock deformation construction control method | |
| Li | Design principles of rock support for underground excavations | |
| CN208010381U (en) | A kind of M types are released can anchor pole | |
| CN112982383A (en) | Gravity type release variable-diameter steel reinforcement cage and anchor rod or pile foundation thereof | |
| CN104929101A (en) | Bottom expanding-multisection side expanding anti-pull prestressed anchoring gravel pile and construction method | |
| Ping et al. | Combined support technology of large section roadway in high-stress fractured surrounding rock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200710 Termination date: 20201210 |