CN104153792A - Energy-absorption yield tunnel support system and method suitable for weak broken wall rock - Google Patents

Energy-absorption yield tunnel support system and method suitable for weak broken wall rock Download PDF

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Publication number
CN104153792A
CN104153792A CN201410356142.1A CN201410356142A CN104153792A CN 104153792 A CN104153792 A CN 104153792A CN 201410356142 A CN201410356142 A CN 201410356142A CN 104153792 A CN104153792 A CN 104153792A
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China
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rock
energy
steel
absorbing
tunnel
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CN201410356142.1A
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Chinese (zh)
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CN104153792B (en
Inventor
李术才
徐飞
张乾青
李利平
张骞
王庆瀚
刘洪亮
王健华
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山东大学
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Abstract

The invention discloses an energy-absorption yield tunnel support system and method suitable for weak broken wall rock. The system comprises a plurality of grid steel frames. The grid steel frames are consistent with the section of a tunnel in shape and of a sealed structure. Steel tubes are disposed in the grid steel frames and connected with the same through sealed yield energy-absorption devices. The combined supports formed by the grid steel frames, the steel tubes and the yield energy-absorption devices are disposed in the tunnel in an equal-interval manner. Adjacent combined supports are connected through longitudinal beams. Reserved holes are symmetrically formed in the longitudinal beams at intervals. Anchor rods or anchor cables for applying prestress are anchored into rock stratums through the reserved holes so as to form a three-dimensional integral support from the wall rock. The system has the advantage that the problem of instability and failure, caused by large wall rock deformation due to the fact that the weak broken wall rock is subjected to long-term train dynamic load, earthquake load and faulting load, of the support system is solved.

Description

A kind of energy-absorbing that is applicable to weak broken wall rock allows presses tunnel support system and method
Technical field
The present invention relates to a kind of energy-absorbing and allow and press novel tunnel supporting and protection structure and implementation method thereof, relate in particular to a kind of tunnel support structure system and implementation method thereof that is applicable to bear for a long time the weak broken wall rock under DYNAMIC LOADING OF DRIVING TRAIN ON BRIDGES, seismic load and faulting load action.
Background technology
For keeping the sound development at full speed of China's economy, realize smoothly the conversion of economic structure system, get through blood vessel---speedway, railway, the subway of the economic lifeline that connects each department, extremely urgent.Get rich and first repair the roads, country has strengthened the construction to each department traffic route.No matter be for strengthening the dynamics to development of the West Regions, still alleviating urban traffic pressure and the city underground of building just like a raging fire in recent years, as many Underground Transportation Engineering all will be in the face of the supporting problem to country rock after tunnel excavation; Especially area, the western China Wei Duo mountain ridge, often need to excavate the Karst Tunnel of easily sending out the prominent mud of gushing water of overlength, such tunnel surrounding weak broken, geological conditions extreme difference, under long-term dynamic loading, country rock easily has the large deformation of the obvious rheological equationm of state, how effective surrounding rock supporting is implemented in such tunnel under long-term train dynamic pressure or seismic loading, also face many new challenges.For the tunnel of self stability extreme difference, its supporting and protection structure is more common is that i iron bow member, grid steel frame, the cooperation anchor net spray techniques such as U-shaped support that can contract carry out combined supporting at present.
Present economic situation and tunnel development trend require supporting should ensure that tunnel safety accomplishes economical rationality again, and surrouding rock stress concentration phenomenon can be alleviated or avoid to simple concrete spraying support, but can not effectively stop tunnel deformation; Although shaped steel arch has the distortion that good support rigidity suppresses tunnel surrounding, because its coefficient of expansion is different from concrete, easily produces the crack of hoop, and very difficult closely knit to support behind concrete filling, have a strong impact on supporting effect.
Summary of the invention
Be subject to for a long time country rock large deformation under DYNAMIC LOADING OF DRIVING TRAIN ON BRIDGES, seismic load and faulting load action to cause the problem of support system unstable failure in order to solve such tunnel surrounding, the present invention proposes a kind of weak broken wall rock tunnel under DYNAMIC LOADING OF DRIVING TRAIN ON BRIDGES, seismic load and faulting load action of being applicable to be subject to for a long time, have energy-absorbing allow press feature form supporting and protection structure by Core Walls Structure and steel grating; Specifically introduce the implementation method of this kind of structure simultaneously,
For achieving the above object, the present invention adopts technical scheme as follows:
A kind of energy-absorbing that is applicable to weak broken wall rock allows the tunnel support system of pressing, comprise some, grid steel frames that structure be enclosed construction consistent with tunnel cross-section shape, in described barrier steelframe, be installed on steel pipe, between described steel pipe and barrier steelframe, press energy absorption device to be connected by allowing of a kind of sealing, described grid steel frame, steel pipe and the sectional shelf-unit that allows pressure energy absorption device form, its interval in tunnel moderate distance arranges, and between adjacent sectional shelf-unit, connects by longitudinal beam; On longitudinal beam, every an intersegmental preformed hole that is provided with apart from symmetry, apply prestressed anchor pole or anchor cable and joist and anchor in rock stratum by preformed hole, country rock is formed to three-dimensional integer support.
Anchor pole (rope) is by longitudinal beam and the acting in conjunction of constraint concrete bow member, it has with country rock contact area large to form a three-dimensional support system, bond effect is good, can jointly be out of shape jointly stressed, there will not be shrinkage crack, because its bow member gap is not prone to thereafter greatly the advantage of cavitation; Under extreme difference wall rock condition, consider the shortcoming of grid steel frame support rigidity deficiency, install steel pipe therein, to steel pipe the inside concrete perfusion, improve its entire compression and bending resistance by preformed hole.
The described energy-absorbing ring of pressing energy absorption device to be made up of high strength steel flat spring that allows, has to allow and presses the characteristic of energy-absorbing.
Described high strength steel disc is the silicon-manganese spring steel sheet that yield strength is greater than 1000Mpa.
Described steel pipe is provided with preformed hole, to steel pipe the inside concrete perfusion, improves its entire compression and bending resistance by preformed hole.
Between barrier steelframe described in every section, be connected with bolt by barrier junction plate, and between connected barrier junction plate, be provided with the rubber pad of different-thickness and intensity.
Between steel pipe described in every section by be furnished with different-thickness and intensity rubber pad steel sleeve connect.
On steel pipe described in every section, two ends are provided with an exhaust opening, and lower end is provided with grout hole, and described exhaust opening and grout hole are all furnished with and the seal cover coordinating separately.
The longitudinal beam that each Pin sectional shelf-unit is formed by i iron or U-shaped channel-section steel, grid steel frame connects; Between described i iron or U-shaped channel-section steel and grid steel frame, adopt outer joint form, by U-shaped clamp or weld together.
The energy-absorbing that is applicable to weak broken wall rock allows presses the implementation method of tunnel support system, comprises the following steps:
1) integrating tunnel sequence of excavation, first, along the local sectional shelf-unit that the steel grating+concrete steel pipe having assembled is installed of excavation face, is fixed on country rock by the prestressed anchor (rope) of being furnished with joist;
2) then immediately newly excavate part, by sleeve pipe and high-strength bolt link remainder sectional shelf-unit, and prestressed anchor pole (rope) and joist be fixed on country rock, ensures that every section of sectional shelf-unit is on same section loop wire simultaneously;
3) after a Pin support installs, segmentation is to steel pipe concrete perfusion, and grout hole is in bottom, and exhaust opening, on top, is sealed grout hole and exhaust opening by seal cover after this section of perfusion finishes, until all steel pipe grouting is complete;
4) by coupling beam, every Pin sectional shelf-unit is connected, simultaneously at coupling beam hole to be provided injection prestressed anchor (rope) and joist, form three-dimensional high strength support system.
The present invention has the following advantages compared with at present conventional tunnel support support and method thereof:
1) by assembled grating steelframe and core concrete steel pipe, overcome and utilized merely grid steel frame to carry out supporting, support rigidity is lower, in the shortcoming of the long-term unfavorable adjoining rock stability of large deformation and Deformation control;
2) by sealing energy-absorbing being installed between steel grating and concrete steel pipe by pressure device, buffer memory and the absorption of the impact energy to the long-term train load in country rock inside or seismic load have been realized; Also realize simultaneously long-term Rheological Deformation dynamically allowed to pressure;
3) by every section of steel grating junction and concrete steel pipe junction install the speciality rubber pad of suitable intensity, thickness, alleviated bump and seismic load the moment of supporting and protection structure destroyed;
4) utilize longitudinal coupling beam that each Pin support is coupled together, form the support system of stereoscopic three-dimensional, be conducive to bring into play the bulk strength of support system;
5) by applying prestressed anchor (rope) and joist, support system and country rock encryption are pressed together, form support circle together with country rock, the plastic flow that suppresses country rock relax zone worsens, and the triaxiality state of having realized country rock maximizes and recovers.
Brief description of the drawings
Fig. 1 is that the main body of apparatus of the present invention embodiment mono-is faced structural representation-1;
Fig. 2 is that the main body of apparatus of the present invention embodiment mono-is faced structural representation-2;
Fig. 3 is that the grid of the corresponding diagram 1 of apparatus of the present invention connects and sleeve pipe detail drawing;
Fig. 4 a is that the energy-absorbing of corresponding diagram 1 of apparatus of the present invention is by pressure device overall diagram;
Fig. 4 b is that the energy-absorbing of corresponding diagram 1 of apparatus of the present invention is by pressure device sectional view;
Fig. 5 is the grid drawing of the corresponding diagram 1 of apparatus of the present invention;
Fig. 6 is the a-a sectional drawing of the corresponding diagram 4 of apparatus of the present invention;
Fig. 7 is the grid expanded view of the corresponding diagram 4 of apparatus of the present invention;
Fig. 8 is the three dimensions schematic diagram of the support system of apparatus of the present invention;
In figure: 1-grid steel frame, 2-concrete steel pipe, 3-sleeve pipe, 4-longitudinal beam, 5-rubber pad a, 6-high-strength bolt, 7-grid junction plate, 8-energy-absorbing is by pressure ring, 9-grout hole, 10-exhaust opening, 11-rubber pad b, 12-prestressed anchor (rope).
Detailed description of the invention
Describe the present invention below in conjunction with accompanying drawing and embodiment mono-.
Apparatus of the present invention mainly comprise grid steel frame 1, concrete steel pipe 2, sleeve pipe 3, longitudinally coupling beam 4, rubber pad a5, high-strength bolt 6, grid junction plate 7, energy-absorbing is by pressure ring 8, grout hole 9, exhaust opening 10, rubber pad b11, prestressed anchor (rope) 12 and joist; Grid steel frame 1 is consistent with tunnel cross-section shape, structure is enclosed construction, barrier steelframe 1 in be installed on concrete steel pipe 2, energy-absorbing by a kind of sealing between concrete steel pipe 2 and barrier steelframe 1 is connected by pressure ring 8, the sectional shelf-unit that grid steel frame 1, concrete steel pipe 2 and energy-absorbing form by pressure ring 8, its interval in tunnel moderate distance arranges, and between adjacent sectional shelf-unit, connects by longitudinal beam; On longitudinal beam, every an intersegmental preformed hole that is provided with apart from symmetry, apply prestressed anchor pole or anchor cable and joist and anchor in rock stratum by preformed hole, country rock is formed to three-dimensional integer support.
Steel grating and concrete surface are long-pending large, bond effect is good, can jointly be out of shape jointly stressedly, there will not be shrinkage crack, because its bow member gap is not prone to greatly thereafter cavitation; But supporting steel grating rigidity is generally less, cannot adapt to heavily stressed surrounding rock tunnel, the design supplements the deficiency of its long-term support rigidity by embedding slip casting round steel pipe therein; Sealing is installed in the two contact position simultaneously and allows pressure device,
Grid steel frame+concrete steel pipe sectional shelf-unit layout that keeps at a certain distance away, between adjacent stent, connected by longitudinal beam, on longitudinal beam, often symmetry leaves anchor pole (rope) hole across a certain distance, apply prestressed anchor (rope) and joist and anchor in rock stratum by preformed hole, country rock is formed to three-dimensional integer support.
Prestressed anchor (rope) 12 is by longitudinal beam and the acting in conjunction of constraint concrete bow member, it has with country rock contact area large to form a three-dimensional support system, bond effect is good, can jointly be out of shape jointly stressed, there will not be shrinkage crack, because its bow member gap is not prone to thereafter greatly the advantage of cavitation; Under extreme difference wall rock condition, consider the shortcoming of grid steel frame support rigidity deficiency, install steel pipe therein, to steel pipe the inside concrete perfusion, improve its entire compression and bending resistance by preformed hole.
The parts that connect between grid steel frame and concrete steel pipe are a kind of sealed device, and the energy-absorbing ring that energy-absorbing is made up of high strength steel flat spring by pressure ring 8 has to allow and presses the characteristic of energy-absorbing.High strength steel disc is the silicon-manganese spring steel sheet that yield strength is greater than 1000Mpa.
Press the excavating sequences sectional in tunnel, between every section of barrier steelframe 1, be connected with original text strength bolts 6 by barrier junction plate 7, and between connected barrier junction plate, be provided with the rubber pad a5 of different-thickness and intensity (depending on country rock by compressive strain requirement).
Concrete steel pipe 2 is provided with preformed hole, to steel pipe the inside concrete perfusion, improves its entire compression and bending resistance by preformed hole.
The steel sleeve 3 of rubber pad b11 by being furnished with different-thickness and intensity (depending on country rock by compressive strain requirement) between every section concrete steel pipe 2 connects.
On steel pipe described in every section, two ends are provided with an exhaust opening 10, and lower end is provided with grout hole 9, and exhaust opening 10 and grout hole 9 be all furnished with and the seal cover coordinating separately, conveniently carry out work post-grouting reinforcing.
Each Pin sectional shelf-unit connects into entirety by longitudinal beam 4, and sectional shelf-unit and longitudinal beam 4 press together supporting structure system and country rock by applying prestressed anchor (rope) and joist 12, forms the three-dimensional support system of three dimensions with country rock.The longitudinal beam being formed by i iron or U-shaped channel-section steel, grid steel frame connects; Between described i iron or U-shaped channel-section steel and grid steel frame, adopt outer joint form, by U-shaped clamp or weld together.Each Pin supporting and protection structure is made up of four parts, between every part, connects by high-strength rubber pad, thus the energy-absorbing yield supporting that is subject to for a long time broken weak tunnel under DYNAMIC LOADING OF DRIVING TRAIN ON BRIDGES or seismic loading of realizing.
The energy-absorbing that is applicable to weak broken wall rock allows presses tunnel support system and implementation method thereof, by reference to the accompanying drawings its method of operating is further set forth:
1) integrating tunnel sequence of excavation, first installs the sectional shelf-unit of the steel grating+concrete steel pipe having assembled along first step excavation face part, be fixed on country rock by prestressed anchor (rope) and joist 12 simultaneously;
2) bottom excavated section immediately then, assemble all the other section of sectional shelf-unit by sleeve pipe 3 and high-strength bolt 6, grid junction plate 7, and injection prestressed anchor (rope) 12 is fixed on country rock, ensure that every section of sectional shelf-unit is on same section loop wire simultaneously;
3) after a Pin support installs, segmentation is to steel pipe concrete perfusion, and grout hole 9 is in bottom, and exhaust opening 10, on top, is sealed grout hole and exhaust opening by supporting seal cover after this section of perfusion finishes, until all steel pipe grouting is complete;
4) by longitudinal coupling beam 4, every Pin sectional shelf-unit is realized longitudinally and being connected, simultaneously at coupling beam hole to be provided injection prestressed anchor (rope) and joist 12, form three-dimensional high strength support system.
Prestressed anchor in the present invention (rope) is at weak surrounding rock smashed to pieces, or crevice water enriches stratum and also can replace with grouted anchor bar or grouting cable anchor etc. in interval, improves the mechanical property of country rock to change the mechanics parameter of country rock.
The present invention only sets forth as an example of example one tunnel support example, but too applicable to the supporting of subway, mine working, karst chamber, dark hole and some special underground constructions.
As known by the technical knowledge, the present invention can realize by other the embodiment that does not depart from its Spirit Essence or essential feature.Therefore, with regard to each side, all just illustrating, is not only.Within the scope of the present invention all or be all included in the invention in the change being equal in scope of the present invention.

Claims (9)

1. an energy-absorbing that is applicable to weak broken wall rock allows the tunnel support system of pressing, it is characterized in that: comprise some, grid steel frames that structure be enclosed construction consistent with tunnel cross-section shape, in described barrier steelframe, be installed on steel pipe, between described steel pipe and barrier steelframe, press energy absorption device to be connected by allowing of a kind of sealing, described grid steel frame, steel pipe and the sectional shelf-unit that allows pressure energy absorption device form, its interval in tunnel moderate distance arranges, and between adjacent sectional shelf-unit, connects by longitudinal beam; On longitudinal beam, every an intersegmental preformed hole that is provided with apart from symmetry, apply prestressed anchor pole or anchor cable and joist and anchor in rock stratum by preformed hole, country rock is formed to three-dimensional integer support.
2. the energy-absorbing that is applicable to weak broken wall rock as claimed in claim 1 allows and presses tunnel support system, it is characterized in that: the described energy-absorbing ring of pressing energy absorption device to be made up of high strength steel flat spring that allows, has to allow and press the characteristic of energy-absorbing.
3. the energy-absorbing that is applicable to weak broken wall rock as claimed in claim 2 allows and presses tunnel support system, it is characterized in that: described high strength steel disc is the silicon-manganese spring steel sheet that yield strength is greater than 1000Mpa.
4. the energy-absorbing that is applicable to weak broken wall rock as claimed in claim 1 allows and presses tunnel support system, it is characterized in that: described steel pipe is provided with preformed hole, to steel pipe the inside concrete perfusion, improves its entire compression and bending resistance by preformed hole.
5. the energy-absorbing that is applicable to weak broken wall rock as claimed in claim 1 allows the tunnel support system of pressing, it is characterized in that: between the barrier steelframe described in every section, be connected with bolt by barrier junction plate, and between connected barrier junction plate, be provided with the rubber pad of different-thickness and intensity.
6. the energy-absorbing that is applicable to weak broken wall rock as claimed in claim 1 allows and presses tunnel support system, it is characterized in that: the steel sleeve of the rubber pad by being furnished with different-thickness and intensity between the steel pipe described in every section connects.
7. the energy-absorbing that is applicable to weak broken wall rock as claimed in claim 6 allows the tunnel support system of pressing, it is characterized in that: on the steel pipe described in every section, two ends are provided with an exhaust opening, lower end is provided with grout hole, and described exhaust opening and grout hole are all furnished with and the seal cover coordinating separately.
8. the energy-absorbing that is applicable to weak broken wall rock as claimed in claim 1 allows and presses tunnel support system, it is characterized in that: the longitudinal beam that each Pin sectional shelf-unit is formed by i iron or U-shaped channel-section steel, grid steel frame connects; Between described i iron or U-shaped channel-section steel and grid steel frame, adopt outer joint form, by U-shaped clamp or weld together.
9. the energy-absorbing that is applicable to weak broken wall rock as described in as arbitrary in claim 1-8 allows presses the implementation method of tunnel support system, it is characterized in that comprising the following steps:
1) integrating tunnel sequence of excavation, first, along the local sectional shelf-unit that the steel grating+concrete steel pipe having assembled is installed of excavation face, is fixed on country rock by prestressed anchor or the anchor cable of being furnished with joist;
2) then immediately newly excavate part, by sleeve pipe and high-strength bolt link remainder sectional shelf-unit, and prestressed anchor pole or anchor cable and joist be fixed on country rock, ensures that every section of sectional shelf-unit is on same section loop wire simultaneously;
3) after a Pin support installs, segmentation is to steel pipe concrete perfusion, and grout hole is in bottom, and exhaust opening, on top, is sealed grout hole and exhaust opening by seal cover after this section of perfusion finishes, until all steel pipe grouting is complete;
4) by coupling beam, every Pin sectional shelf-unit is connected, simultaneously at coupling beam hole to be provided injection prestressed anchor or anchor cable and joist, form three-dimensional high strength support system.
CN201410356142.1A 2014-07-24 2014-07-24 A kind of energy-absorbing being applicable to weak broken wall rock allows presses tunnel support system and method CN104153792B (en)

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Cited By (5)

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CN104675412A (en) * 2015-02-12 2015-06-03 湖南省煤炭地质勘查院 Closed integral bearing supporting structure for coal-mine coal-pillar bottom plate crushed surrounding rock roadway
CN105545322A (en) * 2016-02-26 2016-05-04 山东大学 Protective structure and supporting and protecting systems for controlling tunnel surrounding rock deformation and failure and construction method thereof
CN106194209A (en) * 2016-07-07 2016-12-07 中国石油天然气集团公司 A kind of steel pipe concrete bracket and construction method thereof
CN106321123A (en) * 2016-09-14 2017-01-11 安徽理工大学 Mining support with supporting stiffness capable of being automatically adjusted
CN109386297A (en) * 2018-10-15 2019-02-26 兰州理工大学 A kind of fluid pressure type tunnel classification yield supporting structure and construction method

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CN104675412A (en) * 2015-02-12 2015-06-03 湖南省煤炭地质勘查院 Closed integral bearing supporting structure for coal-mine coal-pillar bottom plate crushed surrounding rock roadway
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CN106194209A (en) * 2016-07-07 2016-12-07 中国石油天然气集团公司 A kind of steel pipe concrete bracket and construction method thereof
CN106194209B (en) * 2016-07-07 2020-02-14 中国石油天然气集团公司 Concrete-filled steel tube support and construction method thereof
CN106321123A (en) * 2016-09-14 2017-01-11 安徽理工大学 Mining support with supporting stiffness capable of being automatically adjusted
CN106321123B (en) * 2016-09-14 2018-06-19 安徽理工大学 A kind of self-adjustable mining bracket of support stiffness
CN109386297A (en) * 2018-10-15 2019-02-26 兰州理工大学 A kind of fluid pressure type tunnel classification yield supporting structure and construction method

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