CN113152628A - V-shaped gully high-fill temporary drainage system and construction method thereof - Google Patents

V-shaped gully high-fill temporary drainage system and construction method thereof Download PDF

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CN113152628A
CN113152628A CN202110343562.6A CN202110343562A CN113152628A CN 113152628 A CN113152628 A CN 113152628A CN 202110343562 A CN202110343562 A CN 202110343562A CN 113152628 A CN113152628 A CN 113152628A
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ditch
layer
filling
trapezoidal
drainage ditch
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张国发
张玉广
彭小勇
蔺港
吁燃
陈芳平
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Guizhou Transportation Planning Survey and Design Academe Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F3/00—Sewer pipe-line systems
    • E03F3/04—Pipes or fittings specially adapted to sewers
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00—Foundations for pavings
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00—Foundations for pavings
    • E01C3/04—Foundations produced by soil stabilisation
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00—Foundations for pavings
    • E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/18—Making embankments, e.g. dikes, dams
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F3/00—Sewer pipe-line systems
    • E03F3/02—Arrangement of sewer pipe-lines or pipe-line systems
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F3/00—Sewer pipe-line systems
    • E03F3/04—Pipes or fittings specially adapted to sewers
    • E03F3/046—Open sewage channels

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  • Life Sciences & Earth Sciences (AREA)
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  • Road Paving Structures (AREA)

Abstract

The invention discloses a V-shaped gully high-fill temporary drainage system and a construction method thereof, wherein the temporary drainage system comprises a V-shaped natural gully and a filled roadbed filled in the V-shaped natural gully, wherein a broken stone blind ditch is arranged at the bottom of the filled roadbed, the filled roadbed is filled in layers, a trapezoidal drainage ditch is arranged at one side of the filled roadbed filled in layers, and a waterproof geomembrane is laid on the surface of the trapezoidal drainage ditch.

Description

V-shaped gully high-fill temporary drainage system and construction method thereof
Technical Field
The invention relates to a V-shaped gully high-fill temporary drainage system and a construction method thereof, belonging to the technical field of V-shaped gully high-fill temporary drainage.
Background
The types of landforms in mountainous areas are mostly erosion structures and river valley terraces, are influenced by structures such as faults and folds, have large relief, obvious peak valley and gully, have vertical and horizontal gully, have very complicated terrain, hydrological and climatic conditions, and have the influence of erosion and scouring of different degrees of water flow on the surface of the earth to form more natural gullies in a V shape. With the advance of the construction of high-grade roads to mountainous areas, the route layout is limited by the conditions of topographic and linear indexes, and more V-shaped gully high-fill sections are inevitably generated.
The V-shaped natural gully is a main drainage corridor for surface water or partial underground water in a mountain area, long-term water flow or seasonal rain source type water flow exists, if rainfall is concentrated in a flood season, the water flow in the gully is large, and the rainfall in winter is small, the water flow in the gully is small. Therefore, the following problems must be avoided in the high fill subgrade provided for crossing the V-shaped natural gully on the road route:
(1) during the filling process, the water content of the filling material plays an important role in improving the compactness. The water flow in the gully is immersed into the filled roadbed, the water content of the filling material is much higher than the optimal water content, and the compaction effect is difficult to meet the requirement when the water content is too large or too small, so that the settlement deformation of the embankment after construction is large, and the driving safety and comfort are seriously influenced;
(2) rainfall is concentrated in the flood season, rainfall intensity is high, water bodies in V-shaped natural gullies are collected quickly, filling of the filled roadbed needs layering compaction and is limited by filler sources, filler transportation and filling rates, the construction period is long, a dammed lake is formed at the rear edge of filling easily in the filling process, a large amount of water permeates into the deep part of the roadbed, seepage easily empties the filled roadbed, and meanwhile shear strength and deformation modulus of roadbed filling are reduced, so that the filled roadbed slips and instability damage are caused.
At present, in the drainage measures of high-fill roadbed which is arranged by crossing V-shaped natural gullies, two types of common gully bottom water seepage blind ditches and culvert pipes are buried at the bottom of the fill, but the drainage capability of the gully bottom water seepage blind ditches is limited, the gully bottom water seepage blind ditches are not suitable for areas with large water quantity, the culvert pipes buried at the bottom of the fill are more used for gully throughout the year, the roadbed is shorter, the problems of culvert pipe crushing, later-stage culvert pipe treatment, economic cost and the like exist in high-fill sections, and the application is less in the actual construction process.
In view of this, in order to solve the temporary drainage problem of the high-fill roadbed in the V-shaped natural gully and reduce the filling difficulty of the high-fill roadbed, the invention of the V-shaped gully high-fill temporary drainage system and the construction method thereof is urgently needed to ensure the construction efficiency, safety and stability of the high-fill roadbed.
Disclosure of Invention
The invention aims to provide a V-shaped gully high-fill temporary drainage system and a construction method thereof, which are suitable for temporary drainage in the filling process of a filling roadbed in a V-shaped natural gully, are easy to arrange and simple and convenient to construct, can especially prevent a large amount of water from infiltrating into the filling roadbed in the construction process, have low construction cost and easy popularization, and can overcome the defects of the prior art.
The technical scheme of the invention is as follows: the temporary drainage system comprises a V-shaped natural gully and a filled roadbed filled in the V-shaped natural gully, wherein a broken stone blind ditch is arranged at the bottom of the filled roadbed, the filled roadbed is filled in layers, a trapezoid drainage ditch is arranged on one side of the filled roadbed filled in layers, and a waterproof geomembrane is laid on the surface of the trapezoid drainage ditch.
The gravel blind ditch consists of a blind ditch top plate, a water filtering geotechnical net, permeable gravel and a blind ditch base; the permeable macadam is filled between the blind ditch top plate and the blind ditch base, and water filtering geotechnical nets are arranged on two sides of the permeable macadam.
The permeable broken stone is built by one or a plurality of broken stones, flaky stones or permeable stones.
The trapezoid drainage ditches are positioned at the tops of the layers of the filling roadbed, and the trapezoid drainage ditches are staggered and shifted to one side of the filling roadbed layer by layer.
The size of the trapezoidal drainage ditch is determined by the following steps:
I. determining the flow rate Q of the storm water and flood of the natural gully0The width b of the bottom of the initial trapezoidal drainage ditch, the height h and the slope ratio m are generally 1-2;
II, determining the minimum water cross section area A of the trapezoidal drainage ditch according to the following formula
Figure RE-GDA0003078455160000031
Figure RE-GDA0003078455160000032
Wherein v is the average flow velocity, R is the hydraulic radius, n is the roughness coefficient, and i is the hydraulic gradient;
iterating until Qi≥Q0And determining the final bottom width b, height h and slope ratio m.
The waterproof geomembrane is paved on the surface of the trapezoidal drainage ditch in sections, the paving width exceeds the top of the trapezoidal drainage ditch, and each section is paved in a lap joint mode.
The method for constructing the V-shaped gully high-fill temporary drainage system comprises the following steps: a, building a broken stone blind ditch at the bottom of the V-shaped natural gully and the filled roadbed; b. filling the A layer of the filled roadbed, calculating the size of the A layer of the filled roadbed, filling a trapezoidal drainage ditch, paving a waterproof geomembrane, and introducing water flow into the trapezoidal drainage ditch after finishing the filling; c. filling the next B layer, filling a trapezoidal drainage ditch on the other side of the trapezoidal drainage ditch of the A layer, paving a waterproof geomembrane, introducing water flow into the trapezoidal drainage ditch of the A layer, cutting off the trapezoidal drainage ditch of the A layer and taking out the waterproof geomembrane in the trapezoidal drainage ditch of the A layer; d, filling the next C layer, filling a trapezoidal drainage ditch on the other side of the B layer of trapezoidal drainage ditch, laying a waterproof geomembrane taken out from the A layer, introducing water flow into the B layer of trapezoidal drainage ditch, cutting off the B layer of trapezoidal drainage ditch and taking out the waterproof geomembrane in the B layer of trapezoidal drainage ditch; f. and c, repeating the steps c and d until the top of the Nth layer of the roadbed is filled, and then building a permanent drainage ditch on the ground surface.
Compared with the prior art, the V-shaped gully high-fill temporary drainage system and the construction method thereof have the beneficial effects that:
(1) before the high fill subgrade is filled, the broken stone blind ditches are firstly constructed to meet basic surface seepage, then the trapezoidal drainage ditches are filled to lay the waterproof geomembrane, and the rear edge ditch runoff is led into the temporary drainage ditches, so that the construction is simple, convenient and quick.
(2) Through two measures of infiltration and infiltration of the rubble blind ditches and runoff in the drainage gullies of the trapezoid drainage ditches, a perfect drainage system is formed, and compared with a conventional high fill drainage mode, the problem of deformation and instability caused by water immersion during the construction of the fill subgrade is effectively solved.
(3) Along with the fill subgrade filling, the two sides of the fill are continuously changed to lift the trapezoidal drainage ditch, the formation of a barrier lake at the rear edge of the fill is avoided, the trapezoidal drainage ditch is directly reserved when the fill is filled to the top of each layer, the excavation is not needed, the filling and tamping construction of the next layer is not influenced, the construction safety is improved, the construction period is greatly saved, the waterproof geomembrane is directly laid after the completion, the trapezoidal drainage ditch is changed according to the construction process, the waterproof geomembrane of the upper layer can be recycled, the temporary drainage measure engineering quantity is reduced, and the construction cost is reduced.
(4) The construction method can be applied to the ditch landform filling roadbed section with large water quantity, is wider in application range and more thorough in drainage, and improves the filling quality and the safety and stability of the high-filling roadbed.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a V-shaped gully high fill temporary drainage system and a construction method thereof.
Fig. 2 is a schematic sectional structure view of the lithotripsy trench.
FIG. 3 is a schematic cross-sectional view of a trapezoidal drain of the present invention.
Figure 4 is a schematic of the flat laying of trapezoidal gutters according to the invention.
FIG. 5 is a schematic view of a ladder drain according to an embodiment of the present invention.
FIG. 6 is a schematic diagram illustrating a construction process of a drainage system according to an embodiment of the present invention.
Wherein, the V-shaped natural gully 1; filling the roadbed 2; a macadam blind ditch 3; a blind ditch top plate 3-1; 3-2 of a water filtering geotechnical net; 3-3 parts of permeable macadam; 3-4 parts of a blind ditch base; a trapezoidal drainage ditch 4; and (5) a waterproof geomembrane.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
Embodiment 1. as shown in fig. 1, a V-shaped gully high fill temporary drainage system comprises a V-shaped natural gully 1 and a fill subgrade 2 filled in the V-shaped natural gully 1, wherein a macadam blind gully 3 is arranged at the bottom of the fill subgrade 2, the fill subgrade 2 is filled in layers, a trapezoid drainage ditch 4 is arranged at one side of the fill subgrade 2 filled in layers, and a waterproof geomembrane 5 is laid on the surface of the trapezoid drainage ditch 4.
FIG. 2 shows that the rubble blind ditch 3 consists of a blind ditch top plate 3-1, a water filtering geotechnical net 3-2, permeable rubbles 3-3 and a blind ditch base 3-4; the water-permeable broken stones 3-3 are filled between the blind ditch top plate 3-1 and the blind ditch base 3-4, and the two sides of the water-permeable broken stones 3-3 are provided with water-filtering geotechnical nets 3-2.
The permeable broken stone 3-3 is built by one or a plurality of broken stones, flaky block stones or permeable block stones.
The trapezoidal drainage ditch 4 is positioned at the top of each layer of the filling roadbed 2, the trapezoidal drainage ditch 4 is changed on one side of the filling roadbed 2 in a staggered mode layer by layer, and the size of the trapezoidal drainage ditch 4 is determined through the following steps:
I. determining the storm flood flow Q of the natural gully 10And an initial trapezoidThe width b of the bottom of the drainage ditch 4, the height h and the slope ratio m are generally 1-2;
II, determining the minimum cross-sectional area A of the trapezoidal drainage ditch 4 according to the following formulas 1 and 2
Figure RE-GDA0003078455160000061
Figure RE-GDA0003078455160000062
Wherein v is the average flow velocity, R is the hydraulic radius, n is the roughness coefficient, and i is the hydraulic gradient;
iterating until Qi≥Q0And determining the final bottom width b, height h and slope ratio m.
The waterproof geomembrane 5 is paved on the surface of the trapezoidal drainage ditch 4 in sections, the paving width exceeds the top of the trapezoidal drainage ditch, and each section is paved in a lap joint mode.
The method for constructing the V-shaped gully high-fill temporary drainage system comprises the following steps:
a. building a macadam blind ditch 3 at the bottom of the V-shaped natural gully 1 and the filling roadbed 2;
b. filling the A layer of the filling roadbed 2, calculating the size of the A layer of the filling roadbed 2, filling a trapezoidal drainage ditch 4, paving a waterproof geomembrane 5, and introducing water flow into the trapezoidal drainage ditch 4 after finishing the filling;
c. filling the next B layer, filling a trapezoidal drainage ditch 4 on the other side of the trapezoidal drainage ditch 4 corresponding to the A layer, laying a waterproof geomembrane 5, introducing water flow into the trapezoidal drainage ditch 4 of the layer, cutting off the trapezoidal drainage ditch 4 of the A layer, taking out the waterproof geomembrane 5 in the trapezoidal drainage ditch and filling;
d. filling the next C layer, filling a trapezoidal drainage ditch 4 on the other side of the B layer trapezoidal drainage ditch 4, laying a waterproof geomembrane 5 taken out from the A layer, introducing water flow into the B layer trapezoidal drainage ditch 4, cutting off the B layer trapezoidal drainage ditch 4, taking out the waterproof geomembrane 5 in the B layer trapezoidal drainage ditch and filling;
f. and (d) repeating the steps c and d until the top of the Nth layer of the roadbed 2 is filled, and then building a permanent drainage ditch on the ground surface.
Specifically, the process of constructing the V-shaped gully high fill temporary drainage system is described below with reference to fig. 5 and 6:
in the embodiment, the height of the filling is 20m, and the torrential rain flood flow Q in the natural gully is determined0＝9.9m3S; preliminarily determining the size of the trapezoidal drainage ditch according to the step I, wherein the bottom width b is 2m, the height h is 1.5m, and the slope ratio m is 1, and calculating to obtain the hydraulic radius R which is 1.05m, the roughness coefficient n which is 0.015, and the hydraulic gradient I which is 0.02; formula (2) gives, according to formula (1) in steps II and III, v ═ 9.74m/s and Q ═ 10.2m3/s>Q0＝9.9m3And/s, if the determined trapezoidal drainage ditch size meets the drainage capacity requirement, the size of the trapezoidal drainage ditch is 2m in bottom width b, 1.5m in height h and 1 in slope ratio m, as shown in fig. 4.
After the size of the trapezoid drainage ditch is determined, the length of each waterproof geomembrane is determined to be 15m in sections, the laying width exceeds the top of the trapezoid drainage ditch by 0.5m, the lap length of each section is 0.5m, and the area of each section of the required waterproof geomembrane is 108m2。
The height of the high fill roadbed is 20m, the high fill roadbed is compacted in a layering mode by adopting a dynamic compaction mode, the layering thickness is 5m, the high fill roadbed is divided into 4 layers in total, the high fill temporary drainage system is constructed by adopting the method in the embodiment, and the construction process is as follows:
b, building and filling a broken stone blind ditch at the bottom of the roadbed according to the step a, filling a trapezoidal drainage ditch with a determined size on the left side of the first layer through the step b, introducing water flow in the drainage ditch into the ditch, and filling and tamping the first layer of filling; filling a second layer of filling roadbed according to the step c, reserving a trapezoidal drainage ditch on the other side, laying a waterproof geomembrane, cutting off the trapezoidal drainage ditch of the first layer after the waterproof geomembrane is finished, taking out the waterproof geomembrane, and simultaneously introducing water flow into the water ditch of the layer; d, filling a third layer of filling roadbed according to the step d, repeatedly utilizing the first layer of waterproof geomembrane, cutting off the second layer of ditch after finishing the filling, taking out the waterproof geomembrane, and simultaneously introducing water flow into the ditch; and d, filling a fourth filling roadbed in the step d, recycling the waterproof geomembrane in the second layer, cutting off the ditch of the third layer and taking out the waterproof geomembrane after finishing the filling, simultaneously introducing water flow into the ditch of the layer, and taking out the waterproof geomembrane of the layer after finishing the construction of the permanent drainage ditch, so that the filling of the high filling roadbed is finished.
Therefore, the drainage ditch with corresponding drainage capacity can be determined according to different natural gully flood flows by adopting the method, the position of the temporary drainage ditch is correspondingly changed according to the construction process, and compared with the conventional high-fill drainage mode, the method can be applied to the gully landform filling roadbed section with larger water quantity, has wider application range and more thorough drainage, and improves the filling quality and the safety and the stability of the filling roadbed.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (7)

1. The utility model provides a V style of calligraphy gully high fill temporary drainage system, it includes V style of calligraphy nature gully (1) and fills in fill road bed (2) in V style of calligraphy nature gully (1), its characterized in that: the filling roadbed (2) is filled in layers, a broken stone blind ditch (3) is arranged at the bottom of the filling roadbed (2), a trapezoidal drainage ditch (4) is arranged on one side of the filling roadbed (2) filled in layers, and a waterproof geomembrane (5) is laid on the surface of the trapezoidal drainage ditch (4).
2. The V-shaped gully high fill temporary drainage system of claim 1, wherein: the gravel blind ditch (3) consists of a blind ditch top plate (3-1), a water filtering geotechnical net (3-2), permeable gravel (3-3) and a blind ditch base (3-4); the water-permeable broken stones (3-3) are filled between the blind ditch top plate (3-1) and the blind ditch base (3-4), and water-filtering geotechnical nets (3-2) are arranged on two sides of the water-permeable broken stones (3-3).
3. The V-shaped gully high fill temporary drainage system of claim 2, wherein: the permeable broken stone (3-3) is built by one or a combination of a plurality of broken stones, flaky block stones or permeable block stones.
4. The V-shaped gully high fill temporary drainage system of claim 1, wherein: the trapezoid drainage ditches (4) are located at the tops of all layers of the filling roadbed (2), and the trapezoid drainage ditches (4) are staggered and changed on one side of the filling roadbed (2) layer by layer.
5. The V-shaped gully high fill temporary drainage system according to any one of claims 1 to 4, wherein: the size of the trapezoidal drainage ditch (4) is determined by the following steps:
I. determining the storm flood flow Q of the natural gully (1)0And the width b of the bottom of the initial trapezoidal drainage ditch (4), the height h and the slope ratio m, wherein m is generally 1-2;
II, determining the minimum water cross section area A of the trapezoidal drainage ditch (4) according to the following formulas (1) and (2)
Figure RE-FDA0003078455150000021
Figure RE-FDA0003078455150000022
Wherein v is the average flow velocity, R is the hydraulic radius, n is the roughness coefficient, and i is the hydraulic gradient;
iterating until Qi≥Q0And determining the final bottom width b, height h and slope ratio m.
6. The V-shaped gully high fill temporary drainage system of claim 1, wherein: the waterproof geomembrane (5) is paved on the surface of the trapezoidal drainage ditch (4) in sections, the paving width exceeds the top of the trapezoidal drainage ditch, and each section is paved in a lap joint mode.
7. A method for constructing a V-shaped gully high-fill temporary drainage system is characterized by comprising the following steps: the method comprises the following steps:
a. building a macadam blind ditch (3) at the bottom of the V-shaped natural gully (1) and the filling roadbed (2);
b. filling the A-th layer of the filling roadbed (2), calculating the size of the A-th layer of the filling roadbed, filling a trapezoidal drainage ditch (4), paving a waterproof geomembrane (5), and introducing water flow into the trapezoidal drainage ditch (4) after the waterproof geomembrane is finished;
c. filling the next B layer, filling a trapezoidal drainage ditch (4) on the other side of the trapezoidal drainage ditch (4) on the A layer, paving a waterproof geomembrane (5), introducing water flow into the trapezoidal drainage ditch (4) on the layer, cutting off the trapezoidal drainage ditch (4) on the A layer and taking out the waterproof geomembrane (5) in the trapezoidal drainage ditch;
d. filling the next C layer, filling a trapezoidal drainage ditch (4) on the other side of the B layer trapezoidal drainage ditch (4), paving a waterproof geomembrane (5) taken out of the A layer, introducing water flow into the layer trapezoidal drainage ditch (4), cutting off the B layer trapezoidal drainage ditch (4) and taking out the waterproof geomembrane (5) in the B layer trapezoidal drainage ditch;
f. and (d) repeating the steps c and d until the top of the Nth layer of the roadbed (2) is filled, and then building a permanent drainage ditch on the ground surface.
CN202110343562.6A 2021-03-30 2021-03-30 V-shaped gully high-fill temporary drainage system and construction method thereof Pending CN113152628A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114607028A (en) * 2022-04-27 2022-06-10 中铁二院工程集团有限责任公司 Hollow drainage body, drainage blind ditch and construction method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114607028A (en) * 2022-04-27 2022-06-10 中铁二院工程集团有限责任公司 Hollow drainage body, drainage blind ditch and construction method thereof

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