CN105447229A - Method for checking anti-frost heaving damage of slope concrete lining layer of water conveyance canal in winter - Google Patents
Method for checking anti-frost heaving damage of slope concrete lining layer of water conveyance canal in winter Download PDFInfo
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- CN105447229A CN105447229A CN201510773619.0A CN201510773619A CN105447229A CN 105447229 A CN105447229 A CN 105447229A CN 201510773619 A CN201510773619 A CN 201510773619A CN 105447229 A CN105447229 A CN 105447229A
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Abstract
The present invention relates to a method for checking anti-frost heaving damage of a slope concrete lining layer of a water conveyance canal in winter. The method is applied to the design of an open channel water conveyance canal and to perform a force analysis on a slope concrete lining layer under an 5 of canal base soil frost heaving. The method comprises: by using a canal slope concrete lining layer as a member with a slope foot as a fixed hinge support and a water level surface as a movable hinge support, establishing a mechanical model of checking the anti-frost heaving damage of a canal slope concrete lining layer; and determining, according to a stress generated by a transverse bending effect or/and a stretch-bending combination effect of the member and axial tensile strength of concrete, whether the slope concrete lining layer can resist the damage generated by a frost heaving effect. According to the method for checking anti-frost heaving damage provided by the present invention, influence of interaction between canal slope bidirectional freezing as well as a concrete lining layer and canal base soil deformation is considered; and a deficiency of a checking method of anti-frost heaving damage capacity of a slope concrete lining layer under the circumstance of water conveyance by a concrete canal in a permafrost region is made up.
Description
Technical field
The present invention relates to one conveyance canal side slope concrete lining course frost heaving resistant in winter and destroy Method for Checking, be applied in the design of open channel canal for water conveyance, carry out the force analysis of canal base soil frost heave action slope concrete lining course.
Background technology
Trapezoidal concrete-lined canal is because of its easy construction, maintain and repair is simple and project durability is strong advantage and be widely used in water delivery engineering and improve open channel emptying effectiveness to reach, strengthen the shock-absorbing capacity of channel and improve the object of flow condition.The side slope concrete lining course plagioclase of channel determines according to HYDRODYNAMIC CONDITION RELATING TO, and the thickness of lining cutting layer is empirically determined.This method is applicable for the concrete-lined canal in Fei Han district; The concrete-lined canal in Er Duihan district, had both made the impact of consideration frost heave action and had specially increased lining cutting layer thickness, but also lining cutting layer can be caused to produce the breakoff phenomenons such as crack, protuberance and slump because of the non-uniform freezing expansion displacement of canal base soil.This has had a strong impact on the direct performance of project benefit.
At present, for winter, the thickness of the only central line tunnel concrete lining in south layer of water determines existing corresponding method, namely to the force analysis that concrete lining course hinged between considered as a whole or plate carries out, carry out lining cutting layer strength checking accordingly, Normal frost heave direction in the method under concrete lining course is domatic outer normal direction, and tangent coordinate system points to toe, there is fundamental difference with the frost-heave force action mode of canal for water conveyance side slope lining cutting in winter layer and scope, the strength checking of the concrete lining course of canal for water conveyance in winter can not be used for completely.
Winter, the Method for Checking of freeze proof expansive force of canal for water conveyance side slope concrete lining course was just appeared in the newspapers, the mechanical model that report method has adopted is: by the Normal frost heave that the tangent coordinate system pointing to top, slope is consistent with domatic outer normal direction with direction under side slope concrete lining course, both for being uniformly distributed.Do not consider in this mechanical model conveyance canal side slope two-way freeze and concrete lining course and canal base soil be out of shape interactional impact.
Summary of the invention
The present invention is directed to prior art deficiency, propose a kind of for conveyance canal side slope concrete lining course frost heaving resistant destruction Method for Checking in winter.Considering that canal slope is two-wayly freezed, lining cutting layer sets up the mechanical model that frost heaving resistant damage capability checks under affecting situation with the native compatibility of deformation of canal base etc., carry out frost heaving resistant with the mechanical model of more closing to reality and destroy checking computations, to guarantee that lining cutting layer has adequate thickness, ensure the safe and reliable operation of channel, farthest play project benefit.
In winter, the side slope concrete lining course below canal middle water level face and its lower soil body are because being that the water in a canal of more than 0 DEG C is protected by temperature in channel, and temperature maintains more than 0 DEG C, and the soil body is without freezing, and the concrete lining course of underwater sites is without displacement; And side slope concrete lining course more than water level face is exposed in air, under the effect of air subzero temperature, aquifer freezing expansion under the concrete lining course at above position, water level face, the concrete lining course at this position has just had along domatic domatic to the displacement trend in canal with vertical to top, slope, causes side slope concrete lining course to be the component of a stretch bending.
The Qu Di lower floor soil body does not freeze and the freezing expansion effect of the upper strata soil body makes side slope lining cutting layer have angular displacement around toe, lining cutting layer under water level face and canal base soil local detachment, water level face above canal base penus is freezed in two-way, and frost heave is perpendicular to freezing front, so the normal direction frost heaving amount perpendicular to lining cutting aspect of soil body each point does not wait under side slope lining cutting layer, normal direction frost heaving amount (maximum) near water level face is greater than top, slope place, but the concrete lining course lower surface after angular displacement still keeps plane, namely little compared with top, slope place of the Normal Displacement (minimum) at water level face place, see Fig. 1.Like this, side slope lining cutting layer in canal frozen base soil section and its lower soil body conjugate inharmonious, both will be separated, and the canal base freezing at first to be integrated is native and just create mutual constraint between concrete lining course, side slope concrete lining course receives that freeze soil body effect, that direction is consistent with domatic inter normal direction Normal frost heave.The difference of the Normal Displacement of frost heave position concrete lining course and the normal direction frost heaving amount of canal dike soil is zero in water level face, Po Dingchu is maximum, and thus the Normal frost heave on top, slope is maximum.
Tangential frost heave displacement and the displacement of normal direction frost heave along domatic sensing Po Ding direction are similar, and the tangential frost heave displacement on top, slope is greater than water level face place, and it is little compared with top, slope place at water level face place that concrete lining course is subject to pointing to the tangent coordinate system pushed up on slope.
When Frozen Soil body can retrain the displacement of side slope concrete lining layer, namely both freeze to be integrated, in other words, side slope concrete lining course with freeze the soil body and be not separated, now, the side slope concrete lining course that toe place is hinged-support, water level face place is moveable hinge bearing, except being subject to water pressure and deadweight, also receiving the direction Normal frost heave consistent with domatic inter normal direction and points to the tangent coordinate system pushed up on slope in frost heave district, both are Triangle-Profile, and top, slope place is maximal value.
If freeze the soil body when can not retrain the displacement of side slope concrete slab, namely both are separated, and the side slope concrete lining course that toe place is hinged-support, water level face place is moveable hinge bearing is only by water pressure and deadweight, and now side slope concrete lining course is a flexural member.
Side slope concrete lining course all will have enough thickness in above-mentioned two situations, to avoid strength failure, ensures that channel safety is normal and runs.
Based on above-mentioned, present invention employs following technical scheme:
One conveyance canal side slope concrete lining course frost heaving resistant in winter destroys Method for Checking, for the canal side slope concrete lining course without horizontal joint, the concrete lining course of canal side slope is regarded as the component that toe place is fixed-hinged support, water level face place is moveable hinge bearing, set up the mechanical model that canal side slope concrete lining course frost heaving resistant destroys checking computations, by the transverse curvature effect of component or/and stress that stretch bending compound action produces to compare the destruction judging that can side slope concrete lining course be resisted frost heave action and produce with concrete axial tensile strength.
Described conveyance canal side slope concrete lining course frost heaving resistant in winter destroys Method for Checking, carries out the checking computations of side slope concrete lining course frost heaving resistant destruction by applying described mechanical model under the two kinds of effects considering canal base soil frost heave action under each water level in canal:
The first situation is that side slope concrete lining course is subject to the effect of water pressure in water level face with the upper surface of lower portion, and the lower surface at above position, water level face is by the effect of frost-heave force;
The second situation is that side slope concrete lining course only has the effect of water pressure at channel water plane with the upper surface of lower portion.
Described conveyance canal side slope concrete lining course frost heaving resistant in winter destroys Method for Checking, if the side slope concrete lining course at above position, water level face can retrain the canal base soil expansion displacement freezed, then canal base soil to the tangent coordinate system of side slope concrete lining layer and Normal frost heave be all with the value at water in a canal plane place be zero, the Qu Ding slope place linear distribution that is maximal value;
If the side slope concrete lining course at above position, water level face can not retrain the canal base soil expansion displacement freezed, then canal base soil acts on side slope concrete lining course without frost-heave force, only make side slope concrete lining course, in canal, angular displacement occur, the lower surface of lining cutting layer subrange is separated with its lower soil body.
Described conveyance canal side slope concrete lining course frost heaving resistant in winter destroys Method for Checking, and canal base soil is the lower surface acting on channel water plane above position lining cutting layer with the form of the normal direction frost heave stress consistent with domatic inter normal direction with direction of the frost heaving pressure along top, domatic sensing slope to the frost-heave force of side slope concrete lining layer.
The beneficial effect that the present invention produces:
1, winter of the present invention, conveyance canal side slope concrete lining course frost heaving resistant destroyed Method for Checking, consider that canal slope is two-way freezes and concrete lining course and canal base soil are out of shape to interact and affect, establish the mechanical model of canal for water conveyance side slope concrete lining course frost heaving resistant destruction checking computations in winter, compensate for the deficiency that current Frozen Area concrete canal water delivery in winter situation slope concrete lining course frost heaving resistant damage capability Method for Checking exists.
2, winter of the present invention, conveyance canal side slope concrete lining course frost heaving resistant destroyed Method for Checking, considering that canal slope is two-wayly freezed, lining cutting layer sets up the mechanical model that frost heaving resistant damage capability checks under affecting situation with the native compatibility of deformation of canal base etc., carry out frost heaving resistant with the mechanical model of more closing to reality and destroy checking computations, to guarantee that lining cutting layer has adequate thickness, ensure the safe and reliable operation of channel, farthest play project benefit.
Accompanying drawing explanation
Fig. 1: plan of transposition during canal for water conveyance side slope concrete lining course frost heave in winter;
In figure,
canal dike soil is positive temperature, and namely in this region, the soil body does not freeze,
canal dike soil is subzero temperature, and namely in this region, the soil body is frozen, 1 canal base soil frost heave real surface line; The non-frost heave surface line of 2 canal base soil; 3 freeze front forward line; Lining cutting layer position before 4 non-frost heaves; 5 water in a canal positions; 6 frost heave backsight course positions;
Fig. 2: side slope concrete lining course force diagram when winter, canal for water conveyance frozen soil was not separated with lining cutting layer;
Fig. 3: side slope concrete lining course force diagram when winter, canal for water conveyance frozen soil was separated with lining cutting layer;
In figure, q is Normal frost heave; τ is tangent coordinate system; G is the value of making a concerted effort of equally distributed concrete lining course deadweight; p
wfor toe place water pressure intensity; α is the angle between plate and surface level; A is moveable hinge bearing; B is fixed-hinged support.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1
The present invention proposes conveyance canal side slope concrete lining course frost heaving resistant destruction Method for Checking in winter, for the canal side slope concrete lining course without horizontal joint, the concrete lining course of canal side slope is regarded as the component that toe place is fixed-hinged support, water level face place is moveable hinge bearing, set up the mechanical model that canal side slope concrete lining course frost heaving resistant destroys checking computations, the stress produced by the transverse curvature effect of component or stretch bending compound action compares the destruction judging that can side slope concrete lining course be resisted frost heave action and produce with concrete axial tensile strength.
Embodiment 2
Conveyance canal side slope concrete lining course frost heaving resistant in winter described in the present embodiment destroys Method for Checking, and the difference of itself and embodiment 1 is: the mechanical model needed for constitution and implementation example 1 so that the frost heaving resistant carrying out concrete lining course destroys checks,
When side slope concrete lining course can retrain canal base soil frost-heaving deformation, both compatibilities of deformation, freeze to be integrated between side slope concrete lining course and frozen soil, now frost-heave force only in above region, water level face, acts on side slope concrete lining course with the direction Normal frost heave consistent with domatic inter normal direction and the form of pointing to the tangent coordinate system that slope is pushed up, and both be all with the value at water in a canal plane place be zero, the Qu Ding slope place linear distribution that is maximal value; Be the first situation, the mechanical model of side slope concrete lining course is the effect being subject to water pressure in meter water level face with the upper surface of lower portion, and the lower surface at above position, water level face is by the stretch bending component of frost-heave force effect.
When side slope concrete lining course can not retrain canal base soil frost-heaving deformation, both are inharmonious, in other words, when both are separated, frozen soil in frozen region is to the effect of concrete lining course without frost-heave force, be the second situation, the mechanical model of side slope concrete lining course is only have the flexural member of effect of water pressure at channel water plane with the upper surface of lower portion.
Under the two kinds of effects considering canal base soil frost heave action under each water level in canal, the checking computations of side slope concrete lining course frost heaving resistant destruction are carried out by applying described mechanical model.
Winter of the present invention, conveyance canal side slope concrete lining course frost heaving resistant destroyed Method for Checking, canal dike soil is the lower surface acting on channel water plane above position lining cutting layer with the form of the normal direction frost heave stress consistent with domatic inter normal direction with direction of the frost heaving pressure along top, domatic sensing slope to the frost-heave force of side slope concrete lining layer, or side slope concrete lining course is not by the effect of frost-heave force.
Embodiment 3
The present embodiment, for actual conditions, is specifically described the directiveness application of conveyance canal side slope concrete lining course frost heaving resistant destruction Method for Checking in winter of the present invention in conveyance canal engineering:
It's winter the pasting water strength grade of concrete is the lining cutting anti-seepage channel of C20, and canal is dark
=4.5m, channel water is dark
=3.5m, slope coefficient
=1.5, side slope lining cutting layer thickness is 0.2m, frost heaving pressure (Triangle-Profile)
kPa, the unit weight of concrete and water respectively
normal direction frost heave stress p maximal value is
kPa, whether checking computations side slope concrete lining course frost heaving resistant ability meets the demands.
The first situation: see Fig. 2,
1) balance fixed-hinged support counter-force at the bottom of water in a canal plane place moveable hinge end reaction and canal is respectively according to the force and moment of side slope concrete lining course
kN
N
n, so be not pulled out; When
be negative, namely point to bottom, slope, and absolute value is when non-frozen soil is to the friction resistance of lining cutting layer under being no more than plate, lining cutting layer is not pulled out.
2) the greatest axis force value of lining cutting layer
n is apart from top, slope 1.784m, i.e. water level face place
3) Maximum bending moment of lining cutting layer
4) cross-sectional area of lining cutting layer and cross section resistance moment
Cross-sectional area
m
2
Xsect resistance moment
5) maximum tension stress value
Then maximum tension stress
mPa>>
1.10MPa
Side slope concrete lining course cannot resist the destruction of frost-heave force, and namely frost heaving resistant damage capability is not enough.
The second situation: see Fig. 3,
1) obtain fixed-hinged support counter-force at the bottom of water in a canal plane place moveable hinge end reaction and canal according to the balance of the force and moment of side slope concrete lining course to be respectively
N
N
namely N points at the bottom of slope, if this value is when under being no more than plate, non-frozen soil is to the friction resistance of lining cutting layer, channel base plate is by the impact of side slope plate.
2) the greatest axis force value of lining cutting layer
n is in slope bottom end
3) Maximum bending moment of lining cutting layer
4) cross-sectional area of lining cutting layer and cross section resistance moment
Cross-sectional area
m
2
Xsect resistance moment
5) maximum tension stress value
Then
mPa>>
1.10MPa
Side slope concrete lining course can not resist the destruction of frost-heave force.
So when this canal side slope concrete lining layer thickness is 0.2 meter, freeze proof requirement can not be met.
Claims (4)
1. one kind winter conveyance canal side slope concrete lining course frost heaving resistant destroy Method for Checking, it is characterized in that: for the canal side slope concrete lining course without horizontal joint, the concrete lining course of canal side slope is regarded as the component that toe place is fixed-hinged support, water level face place is moveable hinge bearing, set up the mechanical model that canal side slope concrete lining course frost heaving resistant destroys checking computations, by the transverse curvature effect of component or/and stress that stretch bending compound action produces to compare the destruction judging that can side slope concrete lining course be resisted frost heave action and produce with concrete axial tensile strength.
2. winter according to claim 1, conveyance canal side slope concrete lining course frost heaving resistant destroyed Method for Checking, it is characterized in that: under the two kinds of effects considering canal base soil frost heave action under each water level in canal, carry out side slope concrete lining course frost heaving resistant destroy checking computations by applying described mechanical model:
The first situation is that side slope concrete lining course is subject to the effect of water pressure in water level face with the upper surface of lower portion, and the lower surface at above position, water level face is by the effect of frost-heave force;
The second situation is that side slope concrete lining course only has the effect of water pressure at channel water plane with the upper surface of lower portion.
3. winter according to claim 1 and 2, conveyance canal side slope concrete lining course frost heaving resistant destroyed Method for Checking, it is characterized in that:
If the side slope concrete lining course at above position, water level face can retrain the canal base soil expansion displacement freezed, then canal base soil to the tangent coordinate system of side slope concrete lining layer and Normal frost heave be all with the value at water in a canal plane place be zero, the Qu Ding slope place linear distribution that is maximal value;
If the side slope concrete lining course at above position, water level face can not retrain the canal base soil expansion displacement freezed, then canal base soil acts on side slope concrete lining course without frost-heave force, only make side slope concrete lining course, in canal, angular displacement occur, the lower surface of lining cutting layer subrange is separated with its lower soil body.
4. winter according to claim 3, conveyance canal side slope concrete lining course frost heaving resistant destroyed Method for Checking, it is characterized in that: canal dike soil is the lower surface acting on channel water plane above position lining cutting layer with the form of the normal direction frost heave stress consistent with domatic inter normal direction with direction of the frost heaving pressure along top, domatic sensing slope to the frost-heave force of side slope concrete lining layer; Or side slope concrete lining course is not by the effect of frost-heave force.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106529046A (en) * | 2016-11-16 | 2017-03-22 | 石河子大学 | Frost heaving damage resistance checking method for trapezoidal concrete channel during low water level operation in winter |
| CN107178392A (en) * | 2017-06-28 | 2017-09-19 | 中铁第四勘察设计院集团有限公司 | A kind of method for controlling Tunneling by mining method secondary lining water pressure |
| CN108334713A (en) * | 2018-02-25 | 2018-07-27 | 吉林农业科技学院 | A kind of minimum concrete irrigation canal lining thickness computational methods based on look-up table |
| CN108519477A (en) * | 2018-04-24 | 2018-09-11 | 西南科技大学 | A kind of frozen ground regions roadbed model pilot system |
| CN114485516A (en) * | 2022-01-26 | 2022-05-13 | 重庆交通大学 | Dangerous rock collapse real-time early warning method and system considering frost heaving force effect in fracture |
| CN115146357A (en) * | 2022-07-14 | 2022-10-04 | 郑州大学 | Method for analyzing influence of soil frost heaving on concrete panel |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106529046A (en) * | 2016-11-16 | 2017-03-22 | 石河子大学 | Frost heaving damage resistance checking method for trapezoidal concrete channel during low water level operation in winter |
| CN106529046B (en) * | 2016-11-16 | 2019-09-13 | 石河子大学 | The frost heaving resistant of concrete ladder-shaped canal destroys Method for Checking when winter low water level operation |
| CN107178392A (en) * | 2017-06-28 | 2017-09-19 | 中铁第四勘察设计院集团有限公司 | A kind of method for controlling Tunneling by mining method secondary lining water pressure |
| CN108334713A (en) * | 2018-02-25 | 2018-07-27 | 吉林农业科技学院 | A kind of minimum concrete irrigation canal lining thickness computational methods based on look-up table |
| CN108519477A (en) * | 2018-04-24 | 2018-09-11 | 西南科技大学 | A kind of frozen ground regions roadbed model pilot system |
| CN108519477B (en) * | 2018-04-24 | 2023-10-13 | 西南科技大学 | Seasonal frozen soil area roadbed model test system |
| CN114485516A (en) * | 2022-01-26 | 2022-05-13 | 重庆交通大学 | Dangerous rock collapse real-time early warning method and system considering frost heaving force effect in fracture |
| CN114485516B (en) * | 2022-01-26 | 2023-07-14 | 重庆交通大学 | Dangerous rock collapse real-time early warning method and system considering frost heaving force effect in fracture |
| CN115146357A (en) * | 2022-07-14 | 2022-10-04 | 郑州大学 | Method for analyzing influence of soil frost heaving on concrete panel |
| CN115146357B (en) * | 2022-07-14 | 2024-02-27 | 郑州大学 | Analysis method for influence of frost heaving of soil body on concrete panel |
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