CN104632259B - End-head self-expansion enlarging type anchoring method for soft and weak stratum - Google Patents

End-head self-expansion enlarging type anchoring method for soft and weak stratum Download PDF

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Publication number
CN104632259B
CN104632259B CN201410855488.6A CN201410855488A CN104632259B CN 104632259 B CN104632259 B CN 104632259B CN 201410855488 A CN201410855488 A CN 201410855488A CN 104632259 B CN104632259 B CN 104632259B
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China
Prior art keywords
anchoring
weak
anchoring agent
resin anchoring
expansion
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CN201410855488.6A
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Chinese (zh)
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CN104632259A (en
Inventor
孟庆彬
韩立军
宗义江
王迎超
韩德明
孙景武
孙康
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中国矿业大学
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Priority to CN201410855488.6A priority Critical patent/CN104632259B/en
Publication of CN104632259A publication Critical patent/CN104632259A/en
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Publication of CN104632259B publication Critical patent/CN104632259B/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting
    • E21D20/025Grouting with organic components, e.g. resin

Abstract

The invention discloses an end-head self-expansion enlarging type anchoring method for a soft and weak stratum. The end-head self-expansion enlarging type anchoring method is suitable for supporting mine soft rock roadways, tunnels, side slopes, foundation pits and other geotechnical engineering, and especially suitable for reinforcing rock and earth mass in the soft and weak stratum. To solve the problem that it is difficult to form an effective anchoring structure in the soft and weak rock and earth mass, the concept that the self expansion force formed by the expanding feature in the curing reaction process of an expanding type resin anchoring agent forms extrusion force on surrounding rocks of the soft and weak stratum is proposed, so that an anchoring segment body of the diameter larger than the original drilling diameter is formed at the anchoring segment, an end-head expanding type anchoring structure is formed, and the reliability and anchoring force of the anchoring structure are improved. The end-head self-expansion enlarging type anchoring structure for the soft and weak stratum is simple and convenient in process, lower in construction cost and better in reinforcing effect of the soft and weak rock and earth mass and has the advantages of being self expandable, capable of conducting anchorage, high in anchorage force, high in reliability and the like, and the method is an anchor rod supporting technology which is easy and convenient to construct, feasible and economical.

Description

Soft stratum termination self-expanding expansion type anchoring process
Technical field:
The present invention relates to the engineering fields such as mine soft-rock tunnel, tunnel, side slope, foundation ditch, particularly to a kind of soft stratum termination Self-expanding expansion type anchoring process.
Background technology:
Suspension roof support is one of common technology of weak rocks soil body supporting, and traditional suspension roof support has simple, quick and easy executing The advantage of work, but for soft stratum Rock And Soil, owing to it anchors limited area, it is difficult to provide enough anchor force, thus Cause anchor pole end tension and slip, cause suspension roof support to lose efficacy.It is said that in general, Rock And Soil intensity is relatively low in soft stratum, anchor Easily it is pulled out after bar anchoring, it is impossible to play the anchor pole active reinforcement effect to Rock And Soil;The especially construction space of underground engineering Limited, heavy construction equipment is difficult with, and causes construction large aperture armature boring the most difficult.
For overcoming the relatively low unfavorable factor of anchor-holding force of anchor bolt in soft stratum, bearing capacity and the anchor force of anchor pole need to be improved, the most Use the anchorage length improving anchor pole and anchor the measures such as contact area.As entirety expands the diameter of armature boring, anchoring can be increased Agent and the contact area of Rock And Soil;Or anchor pole is become full length fastening from termination anchor pole, improve the anchor of anchor pole to a certain extent Gu power, but can cause that efficiency of construction is low, support cost increases, and the anchoring effect of anchor pole is notable, there is anchor pole and its anchor The phenomenon that solid is pulled out jointly;Or use reaming rig that anchoring section is carried out expanding treatment, can be by anchor rod anchored section of certain length In the range of boring enlarged-diameter, so can increase the anchoring contact area of anchor pole, thus improve the withdrawal resistance of anchor pole, but this It is disadvantageous that sample is stablized for the weak rocks soil body, even there will be boring and collapses and the phenomenon such as large deformation destruction, affects engineering and enter Degree;Or use umbrella-type drill bit, and the reaming construction of anchor rod anchored section can be efficiently completed, its construction speed is relatively fast, but it becomes This is higher, and technique is relative complex.Therefore, improve the measure of anchor-holding force of anchor bolt in weak rocks soil layer traditionally, be only from how From the standpoint of increasing anchorage length and the area etc. of anchor pole, produce after not yet recognizing the dilatancy of resin anchoring agent and expanding The expansive force extruding reinforcement effect to the weak rocks soil body, not yet utilizes the self-expanding compression properties of dilatancy resin anchoring agent to improve anchor The reliability of fixing structure and anchor force.Therefore, need to look for a kind of simple, convenient, economical, the termination that can meet again safety requirements is expanded Big bolt support technology is extremely urgent.
Summary of the invention:
The invention aims to the weak point overcome in prior art, it is provided that a kind of technique is simple, safety, economy, effect Significantly soft stratum termination self-expanding expansion type anchor structure.
To achieve these goals, the soft stratum termination self-expanding expansion type anchoring process of the present invention, designs according to bolt diameter Boring aperture, construction drill in the weak rocks soil body, and clear up boring, comprise the steps:
A. different types of resin anchoring agent order is put in boring, first weak dilatancy resin anchoring at the bottom of load hole in boring Agent, puts into high-expansion resin anchoring agent in the middle part of anchoring section afterwards, then places into initial anchoring section weak dilatancy resin anchoring agent;
B. anchor pole is inserted in the boring having installed resin anchoring agent, start jumbolter, control rig and first rotate at a slow speed, treat anchor Bar is each passed through different types of resin anchoring agent until after at the bottom of hole, more quickly Stirring resin anchoring agent 3~5min;
C., after rig stops the rotation stirring, in boring, dissimilar resin anchoring agent is formed flabbily by the size of its expansion rate The extruding space of layer " weak-strong-weak ", weak dilatancy resin anchoring agent at the bottom of hole forms the extruding space to soft stratum after expanding One, the weak dilatancy resin anchoring agent of initial anchoring section forms the extruding space two to soft stratum, in the middle part of anchoring section after expanding High-expansion resin anchoring agent forms the extruding space three to soft stratum after expanding, the expansion extruding scope in extruding space three is more than Extruding space one and extruding space two;
At anchor pole exposed junction, pallet, nut are installed the most according to a conventional method, anchor bar body are applied pretightning force, it is achieved the end of soft stratum Head anchoring.
The total length of described anchoring section is 1.0~2.0m, weak dilatancy resin anchoring agent at the bottom of hole and the weak dilatancy tree of initial anchoring section A length of the 0.3 of fat Anchor Agent~0.6m, a length of 0.4~0.8m of the high-expansion resin anchoring agent in the middle part of anchoring section.
Weak dilatancy resin anchoring agent at the bottom of described hole uses the resin anchoring agent of rapid solidification, the weak dilatancy resin of initial anchoring section Anchor Agent uses middling speed or the resin anchoring agent of slow-set, and the high-expansion resin anchoring agent in the middle part of anchoring section uses at a slow speed or super The flame-retardant polyurethane resin anchoring agent of slow-set, to ensure the weak swollen of weak dilatancy resin anchoring agent at the bottom of hole and initial anchoring section Swollen property resin anchoring agent first solidifies, and the high-expansion resin anchoring agent in the middle part of anchoring section solidifies again, is formed " weak to soft stratum -strong-weak " extruding space.
Beneficial effect: the present invention is directed to be difficult in the weak rocks soil body be formed the problem of effective anchor structure, solid by resin anchoring agent The expansion characteristics formation expansive force changed in course of reaction produces extruding reinforcement effect to soft stratum, utilizes the weak dilatancy of anchored end Formed between the anchor structure formed between resin anchoring agent and anchor bar body and country rock and high-expansion resin anchoring agent and anchor bar body and country rock Anchor structure be combined into compound anchor fixing structure, on the basis of not changing original anchor pole material, construction equipment and technique, use Different types of dilatancy resin anchoring agent, forms swelling stress by expansion characteristics during resin anchoring agent curing reaction, from And soft stratum is produced extruding reinforcement effect, improve anchoring contact and the end face loaded area of anchor pole, provide foot for anchor pole Enough withdrawal resistances and anchor force.On the one hand form larger space and fill resin anchoring agent induration after expansion, expand the anchor of anchor pole Gu contact area and end face loaded area, thus improve the withdrawal resistance of anchor pole, enhance the anchor force of anchor pole, the most logical Cross the extruding weak rocks soil body so that the boring closely knit increase of Rock And Soil medium around, so that its Physical and mechanical properties is changed Kind, it is also beneficial to the formation of anchor structure.By the self-expanding stress of formation in dilatancy resin anchoring agent expansion process to weakness The country rock on stratum forms extruding force, forms one section of anchoring section more than original bore diameter at anchoring section, constitutes reamed end type anchor Fixing structure.Effective anchor structure can be formed in soft stratum, improve reliability and the anchor force of anchor structure, soft rock-soil In Ceng, the anchor force of termination self-expanding expansion type anchor structure is up to 60~80kN, it is achieved the active anchoring support to soft stratum. The expansive force produced after making full use of self-expanding compression properties during the curing reaction of resin anchoring agent and expanding realizes weak rocks The extruding reinforcement effect of the soil body, can reach tradition enlarged footing anchor pole to anchor structure anchor force and the improvement of reliability, it is to avoid Traditional defect improving anchor-holding force of anchor bolt measure, on the basis of ensureing construction safety, it is possible to saving support cost, raising is executed Work efficiency rate.Its technique is simple, safety, economy, effect are notable, has wide applicability.
Accompanying drawing explanation
Fig. 1 is self-expanding expansion type anchor structure in soft stratum termination of the present invention construction schematic diagram.
Fig. 2 is the present invention weak dilatancy resin anchoring agent curing reaction expansion effect schematic diagram.
Fig. 3 is the present invention weak dilatancy resin anchoring agent and high-expansion resin anchoring agent curing reaction expansion effect schematic diagram.
In figure;The 1-weak rocks soil body, 2-holes, 3-anchor bar body, weak dilatancy resin anchoring agent, 5-anchor at the bottom of 4-hole Gu section weak dilatancy resin anchoring agent, high-expansion resin anchoring agent in the middle part of 6-anchoring section, the initial anchoring section of 7-weak dilatancy tree The extruding space that fat Anchor Agent curing reaction is formed after expanding, weak dilatancy resin anchoring agent curing reaction at the bottom of 8-hole is formed after expanding Extruding space, in the middle part of 9-anchoring section high-expansion resin anchoring agent curing reaction expand after formed extruding space, 10-is high-strength Degree anchor rod pallet board, 11-high strength nut.
Detailed description of the invention:
Below in conjunction with the accompanying drawings one embodiment of the present of invention is made the description into upper step:
The soft stratum termination self-expanding expansion type anchoring process of the present invention, specifically comprises the following steps that
A. design boring aperture, construction drill 2 in the weak rocks soil body 1 according to bolt diameter, and clear up boring, lay afterwards Resin anchoring agent: different types of resin anchoring agent order is put in boring 2, first weak expansion at the bottom of load hole in boring 2 Property resin anchoring agent 4, puts into high-expansion resin anchoring agent 6 in the middle part of anchoring section afterwards, then places into the weak expansion of initial anchoring section Property resin anchoring agent 5;The total length of described anchoring section is 1.0~2.0m, weak dilatancy resin anchoring agent 4 at the bottom of hole and initial anchoring A length of the 0.3~0.6m of the weak dilatancy resin anchoring agent 5 of section, the length of the high-expansion resin anchoring agent 6 in the middle part of anchoring section Degree is 0.4~0.8m.
B. with agitator, anchor pole 3 bar tail is coupled with rig head, anchor pole 3 is inserted in the boring 2 installing resin anchoring agent, Start jumbolter, control rig elder generation low speed rotation, be each passed through different types of resin anchoring agent to after at the bottom of hole until anchor pole 3, High speed rotating again, by anchor rod stirring resin anchoring agent 3~5min;
C., after rig stops the rotation stirring, in boring 2, dissimilar resin anchoring agent is formed weakness by the size of its expansion rate The extruding space on stratum " weak-strong-weak ", weak dilatancy resin anchoring agent 4 at the bottom of hole forms the extruding to soft stratum after expanding Space 1, the weak dilatancy resin anchoring agent 5 of initial anchoring section forms the extruding space 27 to soft stratum after expanding, anchoring High-expansion resin anchoring agent 6 in the middle part of Duan forms the extruding space 39 to soft stratum after expanding, extrude the swollen of space 39 Swollen extruding scope is more than extruding space 1 and extruding space 27;At the bottom of described hole, weak dilatancy resin anchoring agent 4 uses fast rapid hardening Solid resin anchoring agent, the weak dilatancy resin anchoring agent 5 of initial anchoring section uses the resin anchoring agent of middling speed or slow-set, High-expansion resin anchoring agent 6 in the middle part of anchoring section uses at a slow speed or the flame-retardant polyurethane resin anchoring agent of super slow-set, with Ensure that at the bottom of hole, the weak dilatancy resin anchoring agent 5 of weak dilatancy resin anchoring agent 4 and initial anchoring section first solidifies, in the middle part of anchoring section High-expansion resin anchoring agent 6 solidify again, form the extruding space to soft stratum " weak-strong-weak ".
D. agitator is changed to erector, starts rig, at anchor pole 3 exposed junction, pallet 10, nut 11 are installed according to a conventional method, Anchor bar body 3 is applied pretightning force and reaches design requirement, it is achieved the end anchorage of soft stratum.
General weak dilatancy resin anchoring agent induration volume free swelling rate is 5~10 times of himself volume, at Rock And Soil about Cubical expansivity under the conditions of bundle is 2~3 times of himself volume, and the self-expanding stress of generation is up to the 1.5~2 of Rock And Soil intensity Times;High-expansion resin anchoring agent induration volume free swelling rate is 25~30 times of himself volume, retrains bar at Rock And Soil Cubical expansivity under part is 5~8 times of himself volume, self-expanding stress is Rock And Soil intensity 2~3 times of generation.Tool The Anchor Agent component parameter of body need to be determined by test with mechanical property and resin material characteristic according to Rock And Soil physics.According to selection Firming agent type and the change of the difference of component ratio and fine aggregate volume control the expansion during the curing reaction of Anchor Agent Rate, thus produce rational swelling stress, is formed and the weak rocks soil body is effectively extruded reinforcement effect.

Claims (1)

1. a soft stratum termination self-expanding expansion type anchoring process, completes the construction of boring (2), cleaning boring, it is characterised in that comprise the steps: in the weak rocks soil body (1) according to bolt diameter design aperture
A. different types of resin anchoring agent order is put in boring (2), first weak dilatancy resin anchoring agent (4) at the bottom of load hole in boring (2), put into high-expansion resin anchoring agent (6) in the middle part of anchoring section afterwards, then place into initial anchoring section weak dilatancy resin anchoring agent (5);
B. anchor pole (3) is inserted in the boring (2) having installed resin anchoring agent, start jumbolter, control rig first to rotate at a slow speed, be each passed through different types of resin anchoring agent until after at the bottom of hole until anchor pole (3), more quickly Stirring resin anchoring agent 3 ~ 5 min;
C. after rig stops the rotation and stirs, in boring (2), dissimilar resin anchoring agent forms the extruding space to soft stratum " weak-strong-weak " by the size of its expansion rate, weak dilatancy resin anchoring agent (4) at the bottom of hole forms the extruding space one (8) to soft stratum after expanding, the weak dilatancy resin anchoring agent (5) of initial anchoring section forms the extruding space two (7) to soft stratum after expanding, high-expansion resin anchoring agent (6) in the middle part of anchoring section forms the extruding space three (9) to soft stratum after expanding, the expansion extruding scope in extruding space three (9) is more than extruding space one (8) and extruding space two (7);
At anchor pole (3) exposed junction, pallet (10), nut (11) are installed the most according to a conventional method, anchor bar body (3) are applied pretightning force, it is achieved the end anchorage of soft stratum;
The total length of described anchoring section is 1.0~2.0 m, a length of 0.3~0.6 m of the weak dilatancy resin anchoring agent (5) of weak dilatancy resin anchoring agent (4) at the bottom of hole and initial anchoring section, a length of 0.4~0.8 m of the high-expansion resin anchoring agent (6) in the middle part of anchoring section.
Weak dilatancy resin anchoring agent (4) at the bottom of described hole uses the resin anchoring agent of rapid solidification, the weak dilatancy resin anchoring agent (5) of initial anchoring section uses middling speed or the resin anchoring agent of slow-set, high-expansion resin anchoring agent (6) in the middle part of anchoring section uses at a slow speed or the flame-retardant polyurethane resin anchoring agent of super slow-set, to ensure that at the bottom of hole, the weak dilatancy resin anchoring agent (5) of weak dilatancy resin anchoring agent (4) and initial anchoring section first solidifies, high-expansion resin anchoring agent (6) in the middle part of anchoring section solidifies again, form the extruding space to soft stratum " weak-strong-weak ".
CN201410855488.6A 2014-12-31 2014-12-31 End-head self-expansion enlarging type anchoring method for soft and weak stratum CN104632259B (en)

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CN2161730Y (en) * 1993-01-19 1994-04-13 成恒棠 Multi-section anchoring-bolt fastening device
CN1179901C (en) * 2002-07-05 2004-12-15 刘茂平 Quick-hardening hih-strength cement anchoring agent
CN102031981B (en) * 2010-11-19 2012-12-05 湖南科技大学 Anchoring method of extensible anchor rod
CN102337912A (en) * 2011-10-17 2012-02-01 新汶矿业集团有限责任公司华丰煤矿 Rapid anchoring method for coal mine roadway anchor rod
CN102536278B (en) * 2012-01-15 2015-01-28 山东科技大学 Progressive yielding combined-type extensible anchor rod and construction method thereof
CN103758551B (en) * 2014-01-22 2017-01-04 山东科技大学 Multistage anchoring type resin anchor and anchoring process thereof

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