CN102943945A - Earthquake-proof protection method for pipeline projects passing through fault zones - Google Patents
Earthquake-proof protection method for pipeline projects passing through fault zones Download PDFInfo
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- CN102943945A CN102943945A CN2012105217186A CN201210521718A CN102943945A CN 102943945 A CN102943945 A CN 102943945A CN 2012105217186 A CN2012105217186 A CN 2012105217186A CN 201210521718 A CN201210521718 A CN 201210521718A CN 102943945 A CN102943945 A CN 102943945A
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Abstract
The invention discloses an earthquake-proof protection method for pipeline projects passing through fault zones. Through a design of a coarse sand cushion layer, a geogrid interlayer and the coarse sand cushion layer, when the faulting occurs, the sand cushion layers are driven to slide with the faulting; then, the lower parts of the sand cushion layers are slide and deformed; and as the sand cushion layers have good transition adjustment capacity, the deformation transferred to the upper parts is smaller and smaller when the lower parts of the sand cushion layers shift. A geogrid is adopted in the middle and makes use of the effect of the sand cushion layers for two times, so the displacement deformation transferred to pipeline places on the earth surface is very small; and meanwhile, spaces for the displacement of the pipelines are kept on both sides of the pipelines so that the pipelines cannot be damaged easily under the action of strike-slip fault. Furthermore, by adopting the structure, the pipelines at the fault zones can be overhauled and maintained conveniently; and the damage of the pipelines can be reduced during faulting, thereby reducing the loss. The method is simple and convenient in construction and low in manufacturing cost.
Description
Technical field
The present invention relates to high earthquake intensity area oil and gas pipeline by the cushion technique field of Earthquake Fault Zone, especially relate to a kind of pipework damping protection method of passing through fracture zone.
Background technique
In the prospective design process of natural gas pipeline projects, the engineering that has many Pipeline Crossing Program high-intensity earthquake fracture zones, in earthquake, the destruction of pipeline is mainly from two aspects: an aspect is the pipeline damage that produces owing to influence of fluctuations, another aspect is because the pipeline damage that large deformation produces, and device for cleaning pipeline to cross the destruction of fracture zone be that typical large deformation destroys example.How to realize the seismatic method for pipeline working design that becomes more meticulous, avoid the pipeline failure, how to adopt effective shock-absorption engineering measure to reduce the problems such as pipeline damage, be the problem that the project planner studies always.
In the world, piping design by the high-intensity earthquake fracture zone is mainly based on Newmark-Hall method or Kennedy method, the latter has considered soil-manage interactional impact, but do not consider the impact of different site conditions, for example pipeline be seated on the basement rock, in thick soil site, deep soil site.Although the enforcement of China's " standard " and " guide rule ", improved the seismatic method for pipeline design level of China, but many new achievements in research also do not have regularization, what for example earthquake engineering circle was new studies show that when the unexpected changing of the relative positions occurs fracture zone, when if surface soil layer has certain thickness, the angle of rupture of surface rupture face, the direction of breaking, displacement amount are different from basement rock.This presentation of results site condition not only affects earthquake response spectrum, and affect surface rupture face and displacement amplitude, if equally for different active fault types (normal fault for example, reversed fault, strike-slip fault etc.), because it is different to have the Ground Ruptures face of certain thickness soil layer, the Seismic Design Method of pipeline will have the huge difference of generation, therefore this achievement in research will directly have influence on the earthquake resistant design method of construction of pipeline and effective earthquake resistant measure of foundation, yet straight at present domesticly also do not have the researcher of pipeline industry similarly to study, can say this be one new, the research that seismatic method for pipeline design and earthquake resistant measure is all had material impact.
In addition " GB50470-2008 standard " also there are the following problems: 1. when earthquake motion peak value during less than 0.3g, the seismatic method for pipeline design method is too simplified, and many important influence factors are consideration not; 2. for the highly seismic region of peak value earthquake motion more than or equal to 0.3g, even used Finite Element Method, but the difference in response of the soil spring model of suggestion and the actual soil body can not reflect the impact of the soil body fully apart from larger.Problem for above-mentioned existence, we will utilize the means such as Large-scale Shaking Table Test method, numerical analysis method that the problems referred to above are conducted a research, on the achievement basis of test and theory analysis, the engineering measure of having set up effective shock-absorbing type for the pipeline that passes through fracture zone is proposed.
The earthquake resistant measure that high-intensity earthquake fracture zone pipeline is passed through in improvement is one of important content of seismatic method for pipeline design.Although the earthquake resistant measure research of surface duct has obtained very much progress, but the earthquake resistant measure research of buried pipeline is but quite backward, for example in China's standard, when speaking of the seismatic method for pipeline measure of passing through the high-intensity earthquake fracture zone, only relate to general principle, and the buried pipeline earthquake resistant measure is not proposed any concrete suggestion.Secondly standard is not considered the impact of site condition in the seismatic method for pipeline design, so that standard same not coming up with concrete proposals for site condition in the seismatic method for pipeline measure.Can see from the development of present structural seismic measure, by improving the earthquake resistant measure of structure, the shock resistance of structure is largely increased.Therefore for the Engineering System of Pipeline Crossing Program high-intensity earthquake fracture zone, the research of carrying out the pipework earthquake resistant measure will be a challenging problem.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of pipework damping protection method of passing through fracture zone.
The technical solution adopted for the present invention to solve the technical problems is: a kind of pipework damping protection method of passing through fracture zone comprises the steps:
(1) at first at crossover fault place excavation groove:
The depth bounds of groove is 1.5～2.0 times of pipe outer diameters, and width range is 1.6～2.2 times of pipe outer diameters;
(2) sidewall at groove arranges barricade;
(3) at the channel bottom laying depth be the coarse sand bed course of 30 ~ 50cm;
(4) on the coarse sand bed course of (3) step laying, lay the GSZ interlayer;
(5) on the GSZ interlayer, re-lay one deck coarse sand bed course by the described method of step (3) again;
(6) oil and gas pipeline is put on the coarse sand bed course of (5) step laying, and makes oil and gas pipeline be positioned at the groove center;
(7) the groove top covers with top cover.
Compared with prior art, good effect of the present invention is: when fault movement, will drive sand bedding course and slide thereupon, sand bedding course thereupon bottom is walked sliding distortion excessively regulating power self is arranged well, when causing the bottom displacement by sand bedding course, the amount of deformation that passes to top is more and more less; The middle GSZ that adopts, role is twice effect that utilizes sand bedding course, the displacement deformation amount that finally is delivered to pipeline place, earth's surface is just very little, and the space is left to the piping displacement amount in the pipeline both sides simultaneously, has so just again guaranteed that pipeline is difficult under strike-slip faulting destroyed; This structure also can make things convenient for the inspection and maintenance of tomography place pipeline simultaneously; Reduce the destruction of pipeline in fault movement, thus cut loss; The inventive method construction is simple and convenient, and cost is low.
Embodiment
A kind of pipework damping protection method of passing through fracture zone comprises the steps:
(1) at first at crossover fault place excavation groove:
The depth bounds of groove is 1.5～2.0 times of pipe outer diameters, and optimum depth is 1.8 times of pipe diameters, and width range is 1.6～2.2 times of pipe outer diameters, and optimum width is 2.0 times of pipe outer diameters.Leave enough width and the degree of depth, when fault movement, pipeline has enough displacement space variables, effectively prevents pipeline damage.
(2) sidewall at groove arranges barricade:
The sidewall of groove is done barricade with concrete, and the effective thickness that concrete is done barricade designs according to common urban water supply and sewerage pipeline construction code requirement.The barricade Main Function is to reinforce pipe trench, guarantees that the pipe trench structure is not subjected to earth pressure or external environment condition and destroys.
(3) lay the coarse sand bed course at channel bottom:
Lay the thick coarse sand bed course of 30 ~ 50cm in the ditch, optimum thickness is 40cm, the size of the coarse sand grains of sand is 3 to 5mm, the coarse sand role of replacement is, when fault movement, the layer of sand particle can be according to the alternate displacement self-control, is delivered to displacement and energy on the pipeline thereby consume the changing of the relative positions, effectively prevents pipeline damage.
(4) on the coarse sand bed course of (3) step laying, lay the GSZ interlayer:
The effect of GSZ interlayer is with blocked up layer of sand separately, the layer of sand displacement to be transmitted can not lose efficacy because layer of sand is blocked up, the energy that the fault movement transmission that can effectively dissipate simultaneously comes up.
(5) on the GSZ interlayer, lay one deck coarse sand bed course by the described method of step (3) again;
(6) oil and gas pipeline is put on the coarse sand bed course of (5) step laying, and make oil and gas pipeline be positioned at the groove center, guarantee that there is certain space in pipeline apart from the both sides barricade, this space need not be filled, effect is to walk sliding the time when tomography, small displacement may occur in pipeline, and this space is reserved to piping displacement.
(7) the groove top covers as top cover with precast concrete plank.
Working principle of the present invention is: when the fault movement of bottom, behind the GSZ sand bedding course, be delivered to the displacement deformation amount of superstructure very little or do not have, i.e. lower moving motionless effect.
Claims (5)
1. a pipework damping protection method of passing through fracture zone is characterized in that: comprise the steps:
(1) at first at crossover fault place excavation groove:
The depth bounds of groove is 1.5～2.0 times of pipe outer diameters, and width range is 1.6～2.2 times of pipe outer diameters;
(2) sidewall at groove arranges barricade;
(3) at the channel bottom laying depth be the coarse sand bed course of 30～50cm;
(4) on the coarse sand bed course of (3) step laying, lay the GSZ interlayer;
(5) on the GSZ interlayer, re-lay one deck coarse sand bed course by the described method of step (3) again;
(6) oil and gas pipeline is put on the coarse sand bed course of (5) step laying, and makes oil and gas pipeline be positioned at the groove center;
(7) the groove top covers with top cover.
2. pipework damping protection method of passing through fracture zone according to claim 1 is characterized in that: the degree of depth of described groove is 1.8 times of pipe outer diameters, and width is 2.0 times of pipe outer diameters.
3. pipework damping protection method of passing through fracture zone according to claim 1 is characterized in that: the size of the coarse sand grains of sand of the described coarse sand bed course of step (3) is 3 to 5mm.
4. pipework damping protection method of passing through fracture zone according to claim 1, it is characterized in that: the thickness of the described coarse sand bed course of step (3) is 40cm.
5. pipework damping protection method of passing through fracture zone according to claim 1, it is characterized in that: the described barricade of step (2) is concrete guard wall.
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| CN2012105217186A CN102943945A (en) | 2012-12-07 | 2012-12-07 | Earthquake-proof protection method for pipeline projects passing through fault zones |
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| CN2012105217186A CN102943945A (en) | 2012-12-07 | 2012-12-07 | Earthquake-proof protection method for pipeline projects passing through fault zones |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574160A (en) * | 2013-11-21 | 2014-02-12 | 中国石油集团工程设计有限责任公司 | Method for designing pipeline passing by strike-slip fault with shock peak value larger than 0.4g |
| CN103593533A (en) * | 2013-11-21 | 2014-02-19 | 中国石油集团工程设计有限责任公司 | Design method for pipeline passing through reverse fault with vibration peak value being more than 0.4g |
| WO2016029318A1 (en) * | 2014-08-27 | 2016-03-03 | Alfa Upgrades Inc. | System and method for improving deformability of buried pipelines |
| CN111046502A (en) * | 2019-11-13 | 2020-04-21 | 长江大学 | Method and device for calculating stiffness of soil spring of pipeline crossing fault |
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| US3952529A (en) * | 1974-04-12 | 1976-04-27 | Lefever Kenneth W | Earthquake fault zone pipeline construction method and arrangement |
| GB1434096A (en) * | 1972-05-31 | 1976-04-28 | Rollmaplast Ag | Method of placing buried plastic pipes |
| JPH0827765A (en) * | 1994-06-29 | 1996-01-30 | Tsutomu Honma | Burial construction method of road occupying object and road occupying object protecting device |
| JP2001032301A (en) * | 1999-07-19 | 2001-02-06 | World Engineering Kk | Construction method for submarine buried structure |
| CN102182866A (en) * | 2011-03-25 | 2011-09-14 | 浙江省火电建设公司 | Backfilling process for large ultra-deep circulating water pipe |
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2012
- 2012-12-07 CN CN2012105217186A patent/CN102943945A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1434096A (en) * | 1972-05-31 | 1976-04-28 | Rollmaplast Ag | Method of placing buried plastic pipes |
| US3952529A (en) * | 1974-04-12 | 1976-04-27 | Lefever Kenneth W | Earthquake fault zone pipeline construction method and arrangement |
| JPH0827765A (en) * | 1994-06-29 | 1996-01-30 | Tsutomu Honma | Burial construction method of road occupying object and road occupying object protecting device |
| JP2001032301A (en) * | 1999-07-19 | 2001-02-06 | World Engineering Kk | Construction method for submarine buried structure |
| CN102182866A (en) * | 2011-03-25 | 2011-09-14 | 浙江省火电建设公司 | Backfilling process for large ultra-deep circulating water pipe |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574160A (en) * | 2013-11-21 | 2014-02-12 | 中国石油集团工程设计有限责任公司 | Method for designing pipeline passing by strike-slip fault with shock peak value larger than 0.4g |
| CN103593533A (en) * | 2013-11-21 | 2014-02-19 | 中国石油集团工程设计有限责任公司 | Design method for pipeline passing through reverse fault with vibration peak value being more than 0.4g |
| CN103574160B (en) * | 2013-11-21 | 2016-06-15 | 中国石油集团工程设计有限责任公司 | Pipeline is by shaking the method for design walking slip fault that peak value is more than 0.4g |
| CN103593533B (en) * | 2013-11-21 | 2016-08-17 | 中国石油集团工程设计有限责任公司 | A kind of pipeline is by shaking the method for designing of the reversed fault that peak value is more than 0.4g |
| WO2016029318A1 (en) * | 2014-08-27 | 2016-03-03 | Alfa Upgrades Inc. | System and method for improving deformability of buried pipelines |
| EP3194826A4 (en) * | 2014-08-27 | 2018-04-11 | Alfa Upgrades Inc. | System and method for improving deformability of buried pipelines |
| US10106948B2 (en) | 2014-08-27 | 2018-10-23 | Alfa Upgrades Inc. | System and method for improving deformability of buried pipelines |
| CN111046502A (en) * | 2019-11-13 | 2020-04-21 | 长江大学 | Method and device for calculating stiffness of soil spring of pipeline crossing fault |
| CN111046502B (en) * | 2019-11-13 | 2023-08-25 | 长江大学 | Soil spring stiffness calculation method and device for pipeline crossing fault |
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Application publication date: 20130227 |