CN102392662A - Bent dynamic and static combined anchor rod - Google Patents

Bent dynamic and static combined anchor rod Download PDF

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Publication number
CN102392662A
CN102392662A CN2011103324757A CN201110332475A CN102392662A CN 102392662 A CN102392662 A CN 102392662A CN 2011103324757 A CN2011103324757 A CN 2011103324757A CN 201110332475 A CN201110332475 A CN 201110332475A CN 102392662 A CN102392662 A CN 102392662A
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CN
China
Prior art keywords
rock
anchor
bent
anchor rod
straight bar
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.)
Pending
Application number
CN2011103324757A
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Chinese (zh)
Inventor
王斌
李夕兵
赵伏军
彭云
龙专
陈玲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henan University of Science and Technology
Hunan University of Science and Technology
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Hunan University of Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hunan University of Science and Technology filed Critical Hunan University of Science and Technology
Priority to CN2011103324757A priority Critical patent/CN102392662A/en
Publication of CN102392662A publication Critical patent/CN102392662A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a bent dynamic and static combined anchor rod which is characterized in that: an anchor rod body needs to be made of high strength materials such as threaded steel and the like, the middle part of the rod body is made into a bent waveform segment which is not bonded and anchored with the surrounding rock, the rest anchor rod body is fully anchored, and the bent segment can be used as an extensible member for providing deformability and is arranged near the boundary between a surrounding rock rupture softening region and an elastic region, thereby providing a certain compensation space for expansion deformation for the surrounding rock in a stress wave boundary effect region; and the tail of the anchor rod is bonded and anchored so as to adapt to lamination debonding failure of a hard rock tunnel wall surface and reinforce the surrounding rock ruptured in the softening region. The anchor rod disclosed by the invention can adapt to complete hard and brittle surrounding rock failure under a higher terrestrial stress condition, can resist the static and dynamic load action of a hard rock tunnel to prevent and control damage of the hard rock tunnel, has the advantage of strong pertinence, is simple and convenient in operation, and is simple in manufacturing and processing.

Description

A kind of bending-type sound assembled bolt
Technical field
The present invention relates to the support apparatus in a kind of hard crisp country rock tunnel, particularly relate to a kind of extending anchor pole of preventing and treating the rock burst disaster, belong to geotechnical engineering anchoring field.
Background technology
In the underground construction of deep solid rock under excavation off-load effect, often peel off, brittle fracture phenomenons such as slabbing, wall caving and rock burst.The characteristics of the hard and compact of hard rock own; Causing the reason of its destruction to relate to the category of dynamic rock mechanics and rock statics two aspects, can be (the seeing work " receiving the catastrophic model of the Dynamic Rock fracture of action of static load " 2004 the 6th phases of coal journal such as left space army) that bears that heavily stressed hard rock body brings out under less exterior power disturbance like rock burst.Dynamic stress when rock burst takes place in the hard rock cavern is very big; Generally can meet or exceed the yield strength of support unit; If letting, support system do not press and surrender character; Just unavoidably destroy, anchor pole can effectively be regulated and control the self-bearing capacity of country rock, so the hard rock support system also adopts extending anchor pole to provide certain distortion to destroy the pressure large deformation that causes to hold rock burst.
Extending anchor pole reduces by operating principle that the body of rod is extending to slide extending two big types with structural member, for the mode of end anchorage is adopted in the elongation that realizes anchor pole usually, i.e. and anchor head and hole bed rock body is fixed and the anchor pole tail is used the pallet pretension.Present extending anchor pole mainly is to propose to the large deformation soft rock; Adopt end anchorage, be with one section pipe and increase the extending anchor pole etc. of resistance pipe of rising like the patent No. 88204483.4 disclosed snakelike extending anchor poles, the patent No. 93203496.9 disclosed zigzag expansion shell type pressure-relieving achor bars, the patent No. 201020632589.4 disclosed anchor pole tails; These anchor poles are applicable to that usually the soft rock distortion keeps the characteristics of country rock integrality continuously; Surperficial rock mass slabbing takes place peel off (like Dali, the buried seepage tunnel of Jinping hydropower station country rock) but the hard rock tunnel is normal under than the high-ground stress effect; Cause the anchor pole pallet unsettled; The anchor pole of end anchorage will lose the effect of reinforcing country rock this moment, thereby the country rock that further brings out this bolt support zone destroys.Thus it is clear that, when the extending anchor pole under the hard rock condition adopts end anchorage, often do not have the effect of anchoring.
For solving the supporting problem in hard rock tunnel; At the extending anchor pole that has proposed a little anti-rock bursts aspect the reply rock burst disaster; Disclosing a kind of prolonging-elastic reactance rock burst anchor pole like patent No. 201020602613.X, though the body of rod is provided with waveform segment and stiffness spring, but still is end anchorage; Patent No. 201020684957.X discloses a kind of water swelling formula elastic reactance rock burst anchor pole; Though can realize full length fastening; Can overcome the influence that wall rock mass slabbing is peeled off, but water swelling formula anchor pole supporting capacity is low, inapplicable during than high-ground stress; Stiffness spring only is the improvement of being extended in the surface, tunnel simultaneously, and the deformability under full length fastening is very weak.The rock burst support technology is different with conventional supporting; Supporting and protection structure under the rock burst condition not only will be able to take the effect of the heavily stressed load under the static conditions, also will resist in the extraneous work progress or stress wave activity that suffered afterwards blasting vibration, mechanical oscillation, earthquake and adjacent rock burst produce.People such as brilliant bodyguard point out that in civilian " the strong and weak powerful model and the applied analysis thereof of the control of impulsion pressure roadway surrounding rock " (2008 the 2nd phases of rock mechanics) rock burst is brought out in the stress wave impact and the roadway surrounding rock structure has close ties; There are some researches show simultaneously at break softened zone and elastic region intersection of country rock and be prone to produce the stress wave boundary effect and bring out rock burst; Therefore, the anchor pole performance also must adapt to the characteristics of hard crisp country rock internal disturbance.Therefore the quiet supporting capacity of extending anchor pole is low under the existing hard rock condition, and can not satisfy hard crisp country rock wall surface layer and split the damage feature with the disturbance of country rock internal motivation.
Summary of the invention
Problem to be solved by this invention provides and a kind ofly overcomes hard crisp country rock wall surface layer and split with the destroying infection of inner country rock energetic disturbance and keep pressure-bearing, continue to let the sound assembled bolt of compressive strain ability.
For high-ground stress hard rock tunnel; Especially having under the rock burst tendentiousness condition, a kind of desirable anchor pole should be before its damage inactivation, to provide image tube seam formula anchor pole the same large deformation ability, to provide the surrounding rock failure dilatation broken bloated space; Again advantages of high bearing capacity can be provided; Have the same high intensity with the regular screw threads anchor pole, adopt the anchorage style of suitable for surrounding rock internal motivation disturbance simultaneously, the anchor pole that meets these conditions promptly is called the sound assembled bolt.
In order to solve the problems of the technologies described above, the solution that bending-type sound assembled bolt of the present invention proposes does, a kind of bending-type sound assembled bolt is made up of anchor tail straight bar section, middle bent section and anchor head straight bar section, is equipped with pallet and nut, wherein:
Anchor tail straight bar section and anchor head straight bar section adopt anchoring agent and hole wall country rock bond-anchorage;
Middle bent Duan Buyu hole wall country rock bonding, but Free Transform elongation after stressed; And install pallet through clamp nut and can form certain prestressing force.
Further, can the middle bent section be arranged in country rock internal rupture softened zone and elastic region boundary vicinity.Like this then can form and better overcome this regional stress wave disturbance.
Further, anchor head straight-bar anchoring section is selected rapid resin anchoring agent for use, and anchor tail straight-bar anchoring section is selected slow resin anchoring agent for use, can pack resin-bonded mastic into to isolate two anchoring sections in the middle bent section 2.
Further, anchor rod body adopts high-strength materials such as screw-thread steel; Body of rod bending section adopts harmless the shaping to handle.
Adopt the bending-type sound assembled bolt of technique scheme; Anchor pole adopts high-strength material that very high quiet supporting capacity can be provided; The deformable bending section of the body of rod can effectively be regulated and control the self-bearing capacity of country rock; With the needed compensation space of suitable for surrounding rock internal sabotage; The surperficial problem that is prone to inefficacy of country rock when the bar stern anchor can be avoided end anchorage admittedly guarantees that hard rock bolt support system yield deformation when disasters such as generation rock burst also still keeps certain drag, has the ability quiet, the dynamic load effect that resists on performance.
In sum; The present invention is that a kind of adaptation is than complete hard crisp surrounding rock failure characteristics under the high-ground stress condition; Can resist hard rock tunnel suffered quiet, dynamic load effect, realize with strong points, easy and simple to handle, the simple sound assembled bolt of fabrication and processing of prevention and control hard rock roadway destruction.
Description of drawings
Fig. 1 is the bending-type sound assembled bolt sketch map of the embodiment of the invention 1.
The specific embodiment
Below with reference to accompanying drawing and specific embodiment the present invention is explained further details.
Bending-type sound assembled bolt provided by the invention; Anchor bar body adopts the high-strength deformed steel bar material to process; The extending member that anchor pole has deformability is a body of rod middle bent section 3, places roadway surrounding rock than the deep, the bending section 3 not anchorings at anchor pole middle part; The anchor bar body of remainder adopts whole anchorings, and installs the certain prestressing force of pallet 4 formation through clamp nut 5.
Embodiment 1: referring to shown in Figure 1, the hard rock roadway surrounding rock can form break softened zone 6 and elastic region 7 under the geostatic stress effect, and the scope of the softened zone 6 that breaks can adopt the relaxation zone testing equipment to measure; According to the surrounding rock failure subregion degree of depth of measuring; Select high-intensity indented bars processing anchor pole for use by the anchor Design standard; Adopt the harmless processing that is shaped to process body of rod bending section 2 at whole anchor pole middle part near near break softened zone 6 and the elastic region 7 border degree of depth; Its crooked size designs by the suitable deflection that country rock allows, and guarantees that anchor tail straight bar section 1 has sufficient length to be used for the anchoring country rock with anchor head straight bar section 3; Adopt the agent of resin anchoring volume; Reserve the bending section 2 not anchorings at anchor pole middle part; The anchor bar body of remainder adopts whole anchorings; Concrete operations are following: at first will directly select the resin anchoring agent of suitable diameter and length to be used for the anchoring at anchor pole two ends, the no curing agent resin clay 2 of the appropriate length of can packing in the bending section 2 according to aperture and bar aTo isolate the effect of two anchoring sections, the resin anchoring agent of two anchoring sections has difference in setting rate, and bar head anchoring section is selected rapid resin anchoring agent 3 for use a, bar tail anchoring section is selected slow resin anchoring agent 1 for use aDuring installation with rapid resin anchoring agent 3 aBe placed on the boring inner end, resin-bonded mastic 2 aAt boring middle part, slow resin anchoring agent 1 aBe placed on the boring outer end, whole anchor pole advances from hell initial line rotation open inward limit under the drive that facility are installed, whole anchor pole is advanced to foot of hole after, the resin anchoring agent in the boring fully mixes the back chemical reaction takes place to be begun to solidify bonding; Rapid resin anchoring agent 3 aAfter arriving setting time, begin to go up clamp nut 5 and carry out pretension, slow resin anchoring agent 1 with 4 pairs of anchor poles of pallet aAfter arriving setting time, can realize the anchoring of anchor tail straight bar section 1.
The present invention is a kind of bending-type sound assembled bolt; This anchor pole can be resisted hard rock tunnel suffered quiet, dynamic load effect; Adaptation is than complete hard crisp surrounding rock failure characteristics under the high-ground stress condition; Can effectively regulate and control the self-bearing capacity of country rock, yield deformation lets press and also still keeps certain drag when disasters such as generation country rock slabbing, rock burst, realizes the effective supporting in hard crisp country rock tunnel.
Above embodiment is the present invention one better embodiment, but is not the whole of content of the present invention, and equivalents and change that all are done in spirit of the present invention all will be in protection domains of the present invention.

Claims (4)

1. bending-type sound assembled bolt, it is characterized in that: anchor rod body is made up of anchor tail straight bar section (1), middle bent section (2) and anchor head straight bar section (3), is equipped with pallet (4) and nut (5), wherein:
Anchor tail straight bar section (1) and anchor head straight bar section (3) adopt anchoring agent and hole wall country rock bond-anchorage;
Middle bent section (2) does not bond with the hole wall country rock, but Free Transform extends after stressed, and installs pallet (4) through clamp nut (5).
2. bending-type sound assembled bolt according to claim 1 is characterized in that: middle bent section (2) is arranged in country rock internal rupture softened zone (6) and elastic region (7) boundary vicinity.
3. bending-type sound assembled bolt according to claim 1 and 2 is characterized in that: anchor head straight bar section (3) is selected rapid resin anchoring agent (3 for use a), anchor tail straight bar section (1) is selected slow resin anchoring agent (1 for use a), the resin-bonded mastic (2 of can packing in the middle bent section (2) a) to isolate anchor tail straight bar section (1) and anchor head straight bar section (3).
4. bending-type sound assembled bolt according to claim 1 and 2 is characterized in that: anchor rod body adopts high-strength materials such as screw-thread steel; Body of rod bending section (2) adopts harmless the shaping to handle.
CN2011103324757A 2011-10-28 2011-10-28 Bent dynamic and static combined anchor rod Pending CN102392662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011103324757A CN102392662A (en) 2011-10-28 2011-10-28 Bent dynamic and static combined anchor rod

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Application Number Priority Date Filing Date Title
CN2011103324757A CN102392662A (en) 2011-10-28 2011-10-28 Bent dynamic and static combined anchor rod

Publications (1)

Publication Number Publication Date
CN102392662A true CN102392662A (en) 2012-03-28

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102877870A (en) * 2012-10-18 2013-01-16 湖南科技大学 Static and dynamic combined intelligent pre-warning anchor rod
CN103953375A (en) * 2014-04-14 2014-07-30 东北大学 Combined type anchor rod with elastic yielding and great damping characteristics
CN106285747A (en) * 2016-09-27 2017-01-04 中国恩菲工程技术有限公司 Anchor rod component and the anchor with it
CN110735437A (en) * 2019-10-10 2020-01-31 中国人民解放军火箭军工程大学 side slope combined protection structure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101943013A (en) * 2010-09-09 2011-01-12 中南大学 Dynamic/static combined support method for rock burst of roadway
CN102031981A (en) * 2010-11-19 2011-04-27 湖南科技大学 Anchoring method of extensible anchor rod
CN201857612U (en) * 2010-11-11 2011-06-08 中国科学院武汉岩土力学研究所 Extending-elastic rock-burst-resistant anchor rod
CN202284476U (en) * 2011-10-28 2012-06-27 湖南科技大学 Curved anchor rod with static and dynamic combined function

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101943013A (en) * 2010-09-09 2011-01-12 中南大学 Dynamic/static combined support method for rock burst of roadway
CN201857612U (en) * 2010-11-11 2011-06-08 中国科学院武汉岩土力学研究所 Extending-elastic rock-burst-resistant anchor rod
CN102031981A (en) * 2010-11-19 2011-04-27 湖南科技大学 Anchoring method of extensible anchor rod
CN202284476U (en) * 2011-10-28 2012-06-27 湖南科技大学 Curved anchor rod with static and dynamic combined function

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102877870A (en) * 2012-10-18 2013-01-16 湖南科技大学 Static and dynamic combined intelligent pre-warning anchor rod
CN103953375A (en) * 2014-04-14 2014-07-30 东北大学 Combined type anchor rod with elastic yielding and great damping characteristics
CN106285747A (en) * 2016-09-27 2017-01-04 中国恩菲工程技术有限公司 Anchor rod component and the anchor with it
CN110735437A (en) * 2019-10-10 2020-01-31 中国人民解放军火箭军工程大学 side slope combined protection structure

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Application publication date: 20120328