CN103147770A - Large-span heavy load stress induction type backfilling open cut tunnel lining structure - Google Patents
Large-span heavy load stress induction type backfilling open cut tunnel lining structure Download PDFInfo
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- CN103147770A CN103147770A CN2013100949996A CN201310094999A CN103147770A CN 103147770 A CN103147770 A CN 103147770A CN 2013100949996 A CN2013100949996 A CN 2013100949996A CN 201310094999 A CN201310094999 A CN 201310094999A CN 103147770 A CN103147770 A CN 103147770A
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Abstract
The invention relates to a large-span heavy load stress induction type backfilling open cut tunnel lining structure, which has the advantages that an open cut tunnel has greater span and can bear greater load, the design thickness of the open cut tunnel lining can be effectively controlled, and in addition, the lining construction quality of the open cut tunnel is easy to control. An inverted arch (13), a side wall (12) and an arch part (11) molded by concrete or reinforced concrete form an annular cross section open cut tunnel lining (10), and the outer contour cambered surface of the side wall (12) and the arch part (11) of the open cut tunnel lining (10) is provided with a stress induction protecting arch (20).
Description
Technical field
The present invention relates to tunnel structure, particularly the stressed induction type backfill of a kind of large span heavy load open cut tunnel liner structure.
Background technology
Consider to save the requirements such as construction costs, reservation planned land use, minimizing operations risks, in railway, Road Design in high slope, rockfall location or have planning to need and the paragraph that can't pass round adopts tunnel open cut tunnel scheme to pass through, especially build railway in the mountainous region, be subjected to the station setting requirement, often occur greatly across high backfill open cut tunnel liner structure.Open cut tunnel lining cutting span develops into three lines, four threaded list roads by general single, double line tunnel, multiple track tunnel even more, follow the continuous breakthrough of tunnel span, tunnel open cut tunnel lining cutting backfill thickness and load are in continuous increase, the open cut tunnel liner structure thickness that guarantees structural safety constantly increases, and the above super thick liner structure of 2m even occurs.Be faced with new challenges and new technical barrier at aspects such as distortion, safety, durability across, the super mass concrete liner structure of high backfill load greatly, need to be resolved hurrily about the construction technology problem of the design parameters such as super thick backfill super-span open cut tunnel sectional form, liner structure form and open cut tunnel.
The existing tunnel liner structure has composite lining or the lining cutting of monolithic open cut tunnel, double track tunnel composite lining structural thickness is generally less than 55cm, monolithic open cut tunnel liner structure thickness is generally less than 80cm, common open cut tunnel lining design load is less, especially open cut tunnel lining design load is generally less than 4m backfill load, and lining structure type all adopts solid concrete or solid steel reinforced concrete section.Across being on the increase of, large cross-section tunnel construction, the continuous increase of open cut tunnel lining design load makes open cut tunnel lining cutting tradition build technology and the theoretical problem that faces is more and more along with greatly.
Although China also took much count of the raising of tunnel open cut tunnel construction technique in nearly ten years, so far still without unified prospective design standard, similar engineering difference aspect design and construction is larger.For protecting general falling rocks, collapse, highway tunnel design specifications (JTGD70-2004) clear open cut tunnel bankets thickness must not be less than 1.5m, but does not do requirement for the maximum backfill thickness in top, open cut tunnel lining cutting hole.Top, the hole of the regulation and stipulation thickness that bankets is not less than 1.5m, has only considered to bear the limit, has faced upward caving on a small quantity of slope, and when the limit, face upward the slope disease is arranged, should suitably increase hole top backfill thickness to guarantee the stable and safety of open cut tunnel in the time of might occuring to cave in more greatly future.Often excavate front original landforms for recovering the hole in Practical Project, even increase thickness of earth covering to reach certain building or engineering demand at original landforms.The thickness that bankets is pushed up in the hole to be increased, and will certainly increase top, top, hole load, causes the open cut tunnel liner structure to produce larger internal force.Engineering experience shows after the depth of fill above open cut tunnel is greater than 30 meters, the thickness of conventional section open cut tunnel lining cutting is often greater than 2m, take the research of tunnel, loop wire dragon's cave-stalactite cave fort airport, hinge northeast, Kweiyang high backfill open cut tunnel liner structure as example, adopt traditional arch open cut tunnel liner structure of clear span 25m backfill height 33m, as adopt conventional design, Arch lining thickness need reach 2.6m, and the inverted arch place reaches 2.8m, and adopts and strengthen arrangement of reinforcement and could satisfy requirement for bearing capacity.And this belongs to concrete in mass in Practical Project, the construction casting difficulty is large, construction quality is restive, and the concrete coefficient of thermal conductivity is less, tends to cause thermal cracking, concrete in mass open cut tunnel liner structure is difficult to satisfy safety of structure and life requirement, almost can not implement.
This shows, banket when higher in large and top when open cut tunnel lining cutting span, even the open cut tunnel section is carried out global optimization, still inevitably can produce larger internal force to the open cut tunnel lining cutting is inner.If increase simply lining thickness, both caused a large amount of bricklaying wastes, can produce larger thermal cracking because the concrete in mass heat of hydration can't effectively eliminate again, cause open cut tunnel lining cutting durability to be protected.
Summary of the invention
Technical problem to be solved by this invention is to provide the stressed induction type backfill of a kind of large span heavy load open cut tunnel liner structure, so that open cut tunnel has larger span and bears larger load, can effectively control the design thickness of open cut tunnel lining cutting, and open cut tunnel lining construction quality is easy to control.
The technical solution adopted for the present invention to solve the technical problems is as follows:
The stressed induction type backfill of large span heavy load of the present invention open cut tunnel liner structure, by arch, abutment wall and the cross section open cut tunnel lining cutting of inverted arch looping that concrete or reinforced concrete clay model are built, it is characterized in that: the outline cambered surface of the arch of described open cut tunnel lining cutting 10, abutment wall arranges stressed inducing and protects arch.
The invention has the beneficial effects as follows, in the arch of open cut tunnel lining cutting, the outline cambered surface of abutment wall arranges stressed inducing and protects arch, the open cut tunnel lining cutting is as main force structure, stressed inducing protected arch and mainly the suffered external force of open cut tunnel lining cutting carried out secondary distribution, the double part backfill load of bearing, namely adopt many materials, MULTILAYER COMPOSITE braced structures, can effectively support open cut longspan tunnel space, only protect by adjusting stressed inducing large span and the high backfill that arch structure shape, material behavior feature can realize open trench tunnel; Open cut tunnel backfill load is redistributed by the stressed stress that protects arch of inducing, the load that acts on the open cut tunnel liner structure is distributed reach optimization, lining cutting is approximate to be positioned on reasonable arch thereby make, can effectively control the design thickness of lining cutting, reduce the liner structure bricklaying, control the liner structure crack developing, improve liner structure impermeability and durability; Open cut tunnel lining construction quality is easy to control, and construction technology is simple, is easy to promote.
Description of drawings
This manual comprises following three width accompanying drawings:
Fig. 1 is the sectional view of the stressed induction type backfill of large span heavy load of the present invention open cut tunnel liner structure;
Fig. 2 is the sectional view along A-A line in Fig. 1;
Fig. 3 is the sectional view along C-C line in Fig. 1.
Member shown in figure and corresponding mark: open cut tunnel lining cutting 10, arch 11, abutment wall 12, inverted arch 13, stressed inducing are protected arch 20, filling tube 30, obturator 40.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
With reference to Fig. 1, Fig. 2 and Fig. 3, the stressed induction type backfill of large span heavy load of the present invention open cut tunnel liner structure, arch 11, abutment wall 12 and the inverted arch 13 looping cross section open cut tunnel lining cutting 10 of being built by concrete or reinforced concrete clay model are in the arch 11 of open cut tunnel lining cutting 10, the outline cambered surface of abutment wall 12 arranges stressed inducing and protect arch 20.Open cut tunnel lining cutting 10 is as main force structure, stressed inducing protected arch and 20 mainly the suffered external force of open cut tunnel lining cutting 10 carried out secondary distribution, the double part backfill load of bearing, change the single lining structure type of bearing load, adopt many materials, MULTILAYER COMPOSITE braced structures, can effectively support open cut longspan tunnel space, only by adjust stressed induce protect arch 20 planforms, the material behavior feature can realize the large span of open trench tunnel, high backfill.
With reference to Fig. 1, open cut tunnel lining cutting 10 is concrete or steel concrete shape of a saddle structure, is the main supporting body of open cut tunnel load, guarantees the stable of open cut tunnel space under load action externally.Protect 20 pairs of stressed secondary distribution of carrying out of open cut tunnel lining cutting 10 of arch by being positioned at outer field stressed inducing, optimize structure stressed, make and act on the structural load of open cut tunnel lining cutting 10 and distribute and reach optimization, open cut tunnel lining cutting 10 is approximate to be positioned on reasonable arch thereby make, can effectively control 10 design thickness of open cut tunnel lining cutting, reduce the liner structure bricklaying, control the liner structure crack developing, improve liner structure impermeability and durability.
With reference to Fig. 1, described stressed inducing protected arch 20 tops and established filling tube 30 along bearing of trend interval, tunnel, and the upper port of filling tube 30 is extended stressed inducing and protected arch 20 outline, and the lower end extends to open cut tunnel lining cutting 10 and protects the space of encircleing between 20 with stressed inducing.Pour into chance water softening type packing material by filling tube 30 to open cut tunnel lining cutting 10 and the stressed space of protecting between arch 20 of inducing during construction, form obturator 40 in the space, make and stressedly induce that to protect arch 20 inwalls and open cut tunnel lining cutting 10 outer walls closely connected, with guarantee stressed induce to protect encircle 20 and can give full play to the effect of carrying out secondary distribution to stressed.
Stressed inducing protected arch 20 both as improving the stressed inducing layer of open cut tunnel lining cutting 10, doubles as simultaneously the stressed supporting member of open cut tunnel backfill load.By stressed induce protect the arch 20 pairs of backfill loads that are applied on the open cut tunnel liner structure adjust, arch 11, the abutment wall 12 of open cut tunnel lining cutting 10 are on reasonable arch, and what act on vertical pressure P in open cut tunnel lining cutting 10 and horizontal pressure force E and open cut tunnel lining cutting width b and open cut tunnel lining cutting height b closely seemingly satisfies following formula and requires: P/E ≈ h/b.
With reference to Fig. 1, stressed outer contour of inducing the inner outline that protects arch 20 to be open cut tunnel lining cutting 10, stressed inducing protected arch 20 outlines according to open cut tunnel buried depth actual conditions, outwards adopts equal thick section or not equal thick section setting.Stressed inducing protected arch and 20 determined material and label according to the structure design needs, for reducing the dead load load, and being conducive to construction and Cost reduction, stressed inducing protected arch and 20 should preferably be adopted slabstone concreting, mortar flag stone etc. can change the material of open-cut tunnel structure bearing distribution.
With reference to Fig. 1, as a kind of typical structural section, described stressed inducing protected preferred employing of arch 20 and cut the non-equal thick section of end ellipticity, its protect pitch of arch H and width B ratio ratio of rise to span f, protect encircle thickness according to open cut tunnel lining section, backfilling material lateral pressure coefficient, protect the calculative determination such as camber piece material characteristic.
Take the high backfill open cut tunnel of certain V level II type two-wire as example, if adopt conventional open-cut tunnel structure design, be applied to open cut tunnel arch vertical load P=γ
h, arch, abutment wall horizontal earth pressure E=λ γ
h, arch thickness needs 1.8m, sidewall thickness 2m, linear meter(lin.m.) C35 concrete eight 8.85m
3, amount of reinforcement reaches 11.1t.And adopt the stressed induction type backfill of large span heavy load of the present invention open cut tunnel liner structure, by the stressed arch of inducing is set, reduce the arch vertical load to 40%～60% of former design load, horizontal loading has increased 50%～70%, open cut tunnel arch, sidewall thickness reduce to 1.4m, and linear meter(lin.m.) steel using amount only 7.8t can satisfy the structure stress requirement.
Calculate in conjunction with several high backfill open cut tunnel lining styles, stressed arch sidewall thickness d1 ≈ 0.1b～0.15b and the thickness of inducing should not be less than 1.2m; Stressedly induce arch sidewall thickness d1 and arch height d2 to be similar to satisfy the following formula requirement: d1:d2 ≈ (2.5～3.5) b:h.
Some principles of the above the stressed induction type backfill of large span heavy load of the present invention open cut tunnel liner structure that just explains through diagrams, be not be the present invention to be confined to shown in and in described concrete structure and the scope of application, therefore every corresponding modify that might be utilized and equivalent all belong to the scope of the claims that the present invention applies for.
Claims (5)
1. the stressed induction type backfill of large span heavy load open cut tunnel liner structure, arch (11), abutment wall (12) and inverted arch (13) looping cross section open cut tunnel lining cutting (10) by concrete or reinforced concrete clay model are built is characterized in that: the arch (11) of described open cut tunnel lining cutting (10), the outline cambered surface of abutment wall (12) arrange stressed inducing and protect arch (20).
2. the stressed induction type backfill of large span heavy load as claimed in claim 1 open cut tunnel liner structure, it is characterized in that: described stressed inducing protected arch (20) top and established filling tube (30) along bearing of trend interval, tunnel, the upper port of filling tube (30) is extended the stressed outline that protects arch (20) of inducing, and the lower end extends to open cut tunnel lining cutting (10) and the stressed space of protecting between arch (20) of inducing.
3. the stressed induction type backfill of large span heavy load as claimed in claim 1 open cut tunnel liner structure is characterized in that: described stressed inducing protected arch (20) and adopted equal thick section.
4. the stressed induction type backfill of large span heavy load as claimed in claim 1 open cut tunnel liner structure is characterized in that: described stressed inducing protected arch (20) and adopted and cut the non-equal thick section of end ellipticity.
5. the stressed induction type backfill of large span heavy load as described in claim 1 to 4 any one open cut tunnel liner structure is characterized in that: described stressed inducing protected arch (20) and adopted sheet stone concrete or mortar flag stone to build by laying bricks or stones.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306248A (en) * | 2013-07-01 | 2013-09-18 | 中国水电顾问集团中南勘测设计研究院 | High dam spillway foundation drainage system and excavation method |
| CN109882205A (en) * | 2019-03-28 | 2019-06-14 | 中铁二院工程集团有限责任公司 | It is a kind of to pass through large-scale suspention backfill structure and construction method without filling solution cavity tunnel |
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| JPH0913872A (en) * | 1995-06-26 | 1997-01-14 | Jdc Corp | Excavating construction method for tunnel with large cross section of arch type |
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| CN202402040U (en) * | 2011-12-30 | 2012-08-29 | 中铁二院工程集团有限责任公司 | Large-volume hollow-concrete tunnel lining structure |
| CN203230437U (en) * | 2013-03-24 | 2013-10-09 | 中铁二院工程集团有限责任公司 | Large-span heavy-load stress induced type backfill open cut tunnel lining structure |
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2013
- 2013-03-24 CN CN201310094999.6A patent/CN103147770B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0913872A (en) * | 1995-06-26 | 1997-01-14 | Jdc Corp | Excavating construction method for tunnel with large cross section of arch type |
| JP2010001633A (en) * | 2008-06-19 | 2010-01-07 | Maeda Corp | Tunnel, tunnel construction method, and device for suppressing cracking of lining concrete |
| CN101598026A (en) * | 2009-06-29 | 2009-12-09 | 中铁二院工程集团有限责任公司 | Wear the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306248A (en) * | 2013-07-01 | 2013-09-18 | 中国水电顾问集团中南勘测设计研究院 | High dam spillway foundation drainage system and excavation method |
| CN109882205A (en) * | 2019-03-28 | 2019-06-14 | 中铁二院工程集团有限责任公司 | It is a kind of to pass through large-scale suspention backfill structure and construction method without filling solution cavity tunnel |
| CN109882205B (en) * | 2019-03-28 | 2024-01-19 | 中铁二院工程集团有限责任公司 | Suspension backfill structure penetrating through large filling-free karst cave tunnel and construction method |
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| CN103147770B (en) | 2016-09-21 |
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