CN109723052A - Height fills out open cut tunnel Calculating method of earth pressure - Google Patents
Height fills out open cut tunnel Calculating method of earth pressure Download PDFInfo
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- CN109723052A CN109723052A CN201811467088.2A CN201811467088A CN109723052A CN 109723052 A CN109723052 A CN 109723052A CN 201811467088 A CN201811467088 A CN 201811467088A CN 109723052 A CN109723052 A CN 109723052A
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Abstract
High open cut tunnel Calculating method of earth pressure is filled out the invention discloses a kind of, on the basis of existing proper calculation method, fully consider the influence factors such as open cut tunnel width, section form, modulus of banketing, side slope slope angle and groove width ratio, the analysis and research of system are carried out to the changing rule of each influence factor with numerical simulation, by mathematical regression method, proposes height and fill out open cut tunnel hole top vertical earth pressure and hole week horizontal earth pressure coefficient lambda suggestion calculation method.Calculation formula of the present invention error compared with numerical simulation calculation result is smaller, therefore calculation method of the present invention is suitable for height and fills out open cut tunnel soil pressure distribution.
Description
Technical field
It is the invention belongs to iron (public affairs) road technical field of tunnel construction, in particular to a kind of high to fill out open cut tunnel soil pressure distribution side
Method.
Background technique
The calculating of open cut tunnel soil pressure load is filled out for height due to China existing iron (public affairs) road Tunnel Design specification to be also not known
Corresponding calculation method is provided, and during carrying out light cave design, internal force calculating is generally carried out using load-structure model
Analysis and strength checking.This calculation method does not account for side slope, groove and the geometric properties such as hole is wide and filling property to bright
The influence of hole soil pressure size.Shown by numerical simulation study: (1) open cut tunnel hole top vertical earth pressure, specification being filled out for height
In earth pillar law theory the case where being only applicable to light fill (h < 5m), when banketing larger, calculated result and actual conditions have partially
Difference is not suitable for height and fills out open cut tunnel vertical earth pressure load design, there is certain limitation；(2) open cut tunnel lateral earth pressure is filled out for height
Power, the calculation method provided from specification is it is found that the high reasonable computation for filling out open cut tunnel horizontal earth pressure and its lateral earth pressure force coefficient are close
Cut phase is closed.However, further from open-cut tunnel structure safety analysis it is found that within the scope of engineering allowable error, hole week lateral earth pressure
Force coefficient is bigger, is advantageous to open-cut tunnel structure stress, therefore suitable lateral earth pressure force coefficient is selected to design open-cut tunnel structure
It is more important.But it through Simulation, standardizes provided horizontal earth pressure coefficient formulas and is not fully applicable in height
The all situations of open cut tunnel lateral earth pressure force coefficient calculating are filled out, calculated result is bigger than normal or less than normal.In conclusion the open cut tunnel that specification provides
It is uneconomic that Calculating method of earth pressure, which fills out open cut tunnel soil pressure design and construction for height, and may lead hair open-cut tunnel structure
Secondary disaster.
Summary of the invention
To solve above-mentioned technical problem of the existing technology, the present invention, which provides, a kind of high fills out open cut tunnel soil pressure distribution side
Method,
Specific formula for calculation is as follows:
(1) height fills out open cut tunnel hole top vertical earth pressure and calculates formula
Q=k0k1k2k3γh
In formula: q- vertical earth pressure value (kPa)；γ-bankets severe (kN/m3)；Earth pillar height (m) at the top of h- open cut tunnel；
k0Open cut tunnel cross sectional shape influences coefficient；k1Modulus of banketing influences coefficient；k2The wide influence coefficient in open cut tunnel hole；k3Open cut tunnel side
Slope slope angle and groove width are than coupling influence coefficient；
Each influence coefficient difference is as follows:
k0=1
The case where for no ditch slope, that is, take k3=1, at this moment vertical earth pressure q=k is pushed up in open cut tunnel hole0k1k2γh；
In formula: B is groove width (m), and D is open cut tunnel width (m), and θ is side slope slope angle (°)；
(2) height fills out open cut tunnel horizontal earth pressure calculation formula
ei=λIt is recommended thatγhi
Wherein, λIt is recommended that=k0·k1·k2·k3；
In formula: eiThe lateral earth pressure force value (kPa) of arbitrary point i on open-cut tunnel structure；hiArbitrary point i on open-cut tunnel structure
Earth pillar height (m)；
Each influence coefficient difference is as follows:
When open cut tunnel section is arch, k0=1；When section is rectangle, k0As above formula；
Wherein,
The case where for no ditch slope, that is, take k3=1, λ at this timeIt is recommended that=k0·k1·k2；
Wherein, Backfill internal friction angle (°).
The present invention on the basis of existing proper calculation method, fully consider open cut tunnel width, section form, modulus of banketing,
The influence factors such as side slope slope angle and groove width ratio, with numerical simulation to the changing rule of each influence factor carry out system analysis and
Research proposes height and fills out open cut tunnel hole top vertical earth pressure and hole week horizontal earth pressure coefficient lambda suggestion meter by mathematical regression method
Calculation method.Finally, verified by certain railway open cut tunnel, calculation formula of the present invention compared with numerical simulation calculation result error compared with
It is small, therefore calculation method of the present invention is suitable for height and fills out open cut tunnel soil pressure distribution.
Height fills out the reasonable computation of open cut tunnel vertical earth pressure and horizontal earth pressure, can both optimize open-cut tunnel structure, makes design more
Adduction reason, and can guarantee the safe handling after being completed.
Specific embodiment
The invention discloses it is a kind of it is high fill out open cut tunnel Calculating method of earth pressure, specific formula for calculation is as follows:
(1) height fills out open cut tunnel hole top vertical earth pressure and calculates formula
Q=k0k1k2k3γh
In formula: q- vertical earth pressure value (kPa)；γ-bankets severe (kN/m3)；Earth pillar height (m) at the top of h- open cut tunnel；
k0Open cut tunnel cross sectional shape influences coefficient；k1Modulus of banketing influences coefficient；k2The wide influence coefficient in open cut tunnel hole；k3Open cut tunnel side
Slope slope angle and groove width are than coupling influence coefficient.
Each influence coefficient difference is as follows:
k0=1
It is right
In no ditch slope the case where, that is, take k3=1, at this moment vertical earth pressure q=k is pushed up in open cut tunnel hole0k1k2γh。
Situation explanation: B is groove width (m) in calculation formula, and D is open cut tunnel width (m), and θ is side slope slope angle (°).It is bright in specification
Hole vertical earth pressure calculates formula are as follows: q=γ h.
(2) height fills out open cut tunnel horizontal earth pressure calculation formula
ei=λIt is recommended thatγhi
Wherein, λIt is recommended that=k0·k1·k2·k3。
In formula: eiThe lateral earth pressure force value (kPa) of arbitrary point i on open-cut tunnel structure；hiArbitrary point i on open-cut tunnel structure
Earth pillar height (m).
Each influence coefficient difference is as follows:
Note: when open cut tunnel section is arch, k0=1；When section is rectangle, k0As above formula.
Wherein,
The case where for no ditch slope, that is, take k3=1, λ at this timeIt is recommended that=k0·k1·k2。
Situation explanation: open cut tunnel horizontal earth pressure calculation formula in specification are as follows: ei=λ γ hi
Wherein, Backfill internal friction angle (°).
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (1)
1. high open cut tunnel Calculating method of earth pressure is filled out a kind of, it is characterised in that:
Specific formula for calculation is as follows:
(1) height fills out open cut tunnel hole top vertical earth pressure and calculates formula
Q=k0k1k2k3γh
In formula: q- vertical earth pressure value (kPa)；γ-bankets severe (kN/m3)；Earth pillar height (m) at the top of h- open cut tunnel；k0?
Open cut tunnel cross sectional shape influences coefficient；k1Modulus of banketing influences coefficient；k2The wide influence coefficient in open cut tunnel hole；k3Open cut tunnel Slope
Angle and groove width are than coupling influence coefficient；
Each influence coefficient difference is as follows:
k0=1
The case where for no ditch slope, that is, take k3=1, at this moment vertical earth pressure q=k is pushed up in open cut tunnel hole0k1k2γh；
In formula: B is groove width (m), and D is open cut tunnel width (m), and θ is side slope slope angle (°)；
(2) height fills out open cut tunnel horizontal earth pressure calculation formula
ei=λIt is recommended thatγhi
Wherein, λIt is recommended that=k0·k1·k2·k3。
In formula: eiThe lateral earth pressure force value (kPa) of arbitrary point i on open-cut tunnel structure；hiThe earth pillar of arbitrary point i on open-cut tunnel structure
Highly (m)；
Each influence coefficient difference is as follows:
When open cut tunnel section is arch, k0=1；When section is rectangle, k0As above formula；
Wherein,
The case where for no ditch slope, that is, take k3=1, λ at this timeIt is recommended that=k0·k1·k2；
Wherein, Backfill internal friction angle (°).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811467088.2A CN109723052B (en) | 2018-12-03 | 2018-12-03 | High-fill open cut tunnel soil pressure calculation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811467088.2A CN109723052B (en) | 2018-12-03 | 2018-12-03 | High-fill open cut tunnel soil pressure calculation method |
Publications (2)
| Publication Number | Publication Date |
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| CN109723052A true CN109723052A (en) | 2019-05-07 |
| CN109723052B CN109723052B (en) | 2021-01-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6764250B2 (en) * | 2002-05-22 | 2004-07-20 | Hanjin Heavy Industries & Construction Co., Ltd. | Method of load reduction on buried culvert using EPS block and/or geosynthetics |
| KR100625250B1 (en) * | 2004-07-22 | 2006-09-20 | 한국건설기술연구원 | A construction method of cover type tunnel structure for decreasing biased earth pressure on cut and a cover type tunnel structure thereby |
| JP2012031662A (en) * | 2010-07-30 | 2012-02-16 | Shimizu Corp | Ground displacement absorbing base isolation structure |
| CN105571768A (en) * | 2016-01-04 | 2016-05-11 | 安徽理工大学 | Shallow-buried tunnel soil pressure calculating method based on displacement monitoring result |
| CN107038291A (en) * | 2017-04-01 | 2017-08-11 | 长安大学 | High roadbed culvert contains the straight Calculating method of earth pressure of roof pendant |
-
2018
- 2018-12-03 CN CN201811467088.2A patent/CN109723052B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6764250B2 (en) * | 2002-05-22 | 2004-07-20 | Hanjin Heavy Industries & Construction Co., Ltd. | Method of load reduction on buried culvert using EPS block and/or geosynthetics |
| KR100625250B1 (en) * | 2004-07-22 | 2006-09-20 | 한국건설기술연구원 | A construction method of cover type tunnel structure for decreasing biased earth pressure on cut and a cover type tunnel structure thereby |
| JP2012031662A (en) * | 2010-07-30 | 2012-02-16 | Shimizu Corp | Ground displacement absorbing base isolation structure |
| CN105571768A (en) * | 2016-01-04 | 2016-05-11 | 安徽理工大学 | Shallow-buried tunnel soil pressure calculating method based on displacement monitoring result |
| CN107038291A (en) * | 2017-04-01 | 2017-08-11 | 长安大学 | High roadbed culvert contains the straight Calculating method of earth pressure of roof pendant |
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| CN109723052B (en) | 2021-01-29 |
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