CN115613410A - Horizontal reinforced drainage technology of composite geotechnical material-broken stone cushion layer and construction process thereof - Google Patents
Horizontal reinforced drainage technology of composite geotechnical material-broken stone cushion layer and construction process thereof Download PDFInfo
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- CN115613410A CN115613410A CN202211032701.4A CN202211032701A CN115613410A CN 115613410 A CN115613410 A CN 115613410A CN 202211032701 A CN202211032701 A CN 202211032701A CN 115613410 A CN115613410 A CN 115613410A
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- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 3
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- 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
- E01C3/003—Foundations for pavings characterised by material or composition used, e.g. waste or recycled material
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- 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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a composite geotechnical material-broken stone cushion horizontal enhanced drainage technology and a construction process thereof, which are suitable for draining a high-groundwater-level pavement structure in the south, wherein the composite geotechnical material consists of polypropylene fiber non-woven fabrics and a drainage net, the broken stone cushion, a hydraulic conduction layer, a geotechnical drainage layer and an isolation layer are sequentially arranged from top to bottom, and the broken stone cushion eliminates a capillary blocking effect, so that the rapid drainage of seepage and capillary rising water of a pavement structure layer is realized in an unsaturated state, the damage of the seepage and the capillary rising water on the pavement structure is reduced, meanwhile, the water is prevented from further infiltrating a soil body in a roadbed to reduce the strength of the roadbed, the bearing performance of the pavement structure and the soil body of the roadbed is improved, and a high-efficiency, energy-saving, environment-friendly and sustainable countermeasure is provided for the water disaster disposal of the pavement structure.
Description
Technical Field
The invention relates to a horizontal reinforced drainage technology of a composite geotechnical material-broken stone cushion layer and a construction process thereof.
Background
The sources of the water accumulated in the pavement structure layer mainly include two types: the first type is capillary rising water, for example, when underground water is buried deeply, the water infiltrates into the pavement structure layer due to capillary rising effect, and when the content of fine particles in the base layer exceeds 4%, the water content of the pavement structure layer is easily increased due to capillary rising effect; and secondly, water seepage is caused, rainfall penetrates into the pavement structure layer through pavement cracks and road shoulders, and the water content of the pavement structure layer is easily increased. The water content of the pavement structure layer is increased, so that the modulus and the strength of the pavement structure layer are reduced, and the deformation of the pavement structure under the action of traffic circulating load is increased. Meanwhile, the strength of the roadbed soil body can be reduced by further infiltration of water into the roadbed soil body, the layered water of the pavement structure and the softening of the roadbed soil body in the presence of water are main causes of performance degradation caused by water disasters of road engineering, and the performance degradation caused by the water disasters of the road engineering comprises but is not limited to ruts, pits, namely mud, expansive soil roadbed edge cracks and frost heaving influences in cold areas.
At present, the water disaster disposal technology of the pavement structure is mainly divided into three types: gutter drainage, graded gravel layer drainage and geosynthetic drainage. Gutter drainage is used to collect and remove water penetrating pavement structures, but is limited in its application to base materials having a low fine particle content. The graded broken stone layer can successfully eliminate the infiltration water, but the manufacture of a large amount of graded broken stone materials is not an environment-friendly and sustainable approach, and the manufacturing cost is higher than that of common base materials. Geosynthetic drainage materials are often used to prevent groundwater from wicking up to the base layer, but tend to form a capillary blocking effect between the pavement structure layer and the geotextile, resulting in water accumulation in the overlying pavement structure layer, an increase in the water content of the pavement structure layer, and a reduction in the modulus and strength of the pavement structure layer. In addition, the existing pavement structure drainage design is based on saturated soil bodies, the unsaturated condition is not considered, the pavement structure is often in the unsaturated state during operation, and the traditional pavement structure drainage can only drain gravity water under the saturated condition and cannot drain capillary water under the unsaturated condition. Stormont proposes that a glass fiber geotextile conducting layer is arranged to remove the seepage water under the unsaturated condition, but the glass fiber geotextile has high manufacturing cost and is difficult to apply and popularize in engineering practice. In these years, the novel Wicking Geotextile (Wicking geotex) is applied in the united states and can be used for draining accumulated water of a pavement structure under a non-saturated state, but the novel Wicking Geotextile as an innovative material cannot be produced domestically.
To sum up, no measure can well solve the water disaster of the road engineering so far, technical innovation is still needed, more efficient, energy-saving, environment-friendly and sustainable measures for disposing the water disaster of the road engineering are provided, particularly, under the unsaturated condition, the seepage water and the capillary rising water of the road surface structure layer are timely discharged, the performance degradation of the seepage water and the capillary rising water to the road surface structure layer is reduced, meanwhile, the water is prevented from further infiltrating the roadbed soil body to reduce the strength of the roadbed soil body, and the bearing performance of the road surface structure and the roadbed soil body is improved.
Disclosure of Invention
At present, the problem of water accumulation of a pavement structure under unsaturated conditions is difficult to solve by traditional drainage of the pavement structure, and a pavement structure water disaster caused by the water accumulation of the pavement structure is eliminated.
Geotextiles are commonly used for road surface drainage, the drainage of conventional geosynthetics only drains under the saturated condition of upper soil covering bodies, but most of road surface structure layers are in unsaturated states, and the seepage of the road surface structure layers cannot be timely drained under the unsaturated states.
Foreign scholars have developed GCBD with glass fiber geotextile as a conductive layer and H2Ri type geotextile with wick fiber as horizontal enhanced drainage for pavement structure drainage, and indoor model experiments, numerical analysis and field test researches show that accumulated water in a pavement structure layer can be drained in time in an unsaturated state, the modulus and strength of a base layer are improved, uneven settlement is reduced, and the long-term performance of traffic infrastructure is improved. But the material cost is high, the construction requirement is high, and the popularization and the application are difficult.
Based on the unsaturated seepage theory, a new technology of composite geotechnical material-broken stone bedding course horizontal reinforced drainage suitable for draining the pavement structure of high groundwater level in south is developed, wherein the composite geotechnical material consists of polypropylene fiber non-woven fabric and a drainage net, and the broken stone bedding course, a hydraulic conduction layer, a geotechnical drainage layer and an isolation layer are sequentially arranged from top to bottom. The distribution of the water content and the pore water pressure of the pavement structure layer provided with the gravel cushion layer is shown in figure 1, and figure 1 shows that the gravel cushion layer is arranged to eliminate the capillary blocking effect, reduce the accumulated water accumulated in the pavement structure layer due to the capillary blocking effect, timely remove the accumulated water in the pavement structure layer, reduce the water content and the pore water pressure of the pavement structure layer and reduce the damage of the infiltration water to the pavement structure. Meanwhile, the roadbed soil body is prevented from further infiltrating, and the bearing performance of the roadbed soil body is improved. Scientific research and technical application summarization form a set of systematic composite geotechnical material-broken stone cushion layer horizontal direction enhanced drainage new technology and a construction process thereof.
The horizontally enhanced drainage of the pavement structure composite geotechnical material-gravel cushion layer aims to eliminate the capillary blocking effect through the gravel cushion layer, realize timely drainage of accumulated water of a pavement structure layer under the unsaturated condition and ensure the pavement structure performance. The horizontal reinforced drainage profile of the composite geotechnical material-broken stone cushion layer of the pavement structure is shown in figure 2, the horizontal reinforced drainage profile of the composite geotechnical material-broken stone cushion layer comprises a broken stone cushion layer, a hydraulic conduction layer, a geotechnical drainage layer and an isolation layer from top to bottom, the composite geotechnical material-broken stone cushion layer is generally arranged between a roadbed and a base layer, an originally designed graded broken stone layer can be eliminated or partially eliminated, the thickness of the broken stone cushion layer is 10cm, the particle size is not more than 10mm, the grading is good, and the compactness is not less than 0.80. The horizontally enhanced drainage of the composite geotechnical material-gravel cushion layer can also be arranged between the surface layer and the base layer to replace a common inverted structure layer, and the arrangement mode is shown in figure 3. The composite geotechnical material-broken stone cushion layer of the pavement structure is horizontally arranged towards a reinforcing drainage plane, as shown in figure 4, the geotechnical drainage layer in the longitudinal direction of the road can be arranged in a full section or in a strip shape, and the distance can be 10m.
The section of the composite geotechnical material used for horizontally enhancing drainage of the pavement structure composite geotechnical material-broken stone cushion layer is shown in figure 5, the performance index of the drainage net material meets the requirement of table 1, and the performance index of the geotextile used for horizontally enhancing drainage of the pavement structure composite geotechnical material-broken stone cushion layer meets the requirement of table 2. The composite geotechnical material of the pavement structure-broken stone cushion layer horizontally used for enhancing drainage has the advantages of 10cm thickness, grain size not greater than 10mm, good gradation and compactness not less than 0.80.
Table 1 composite geosynthetic drainage network performance
Table 2 properties of wrapped geotextile materials
Drawings
FIG. 1 is a mechanism diagram of the present invention, namely, a distribution diagram of water content and pore water pressure of a pavement structure layer with a gravel cushion.
Fig. 2 is a sectional view showing a horizontal reinforcing drainage arrangement of a composite geotextile material-gravel cushion layer of a pavement structure according to an embodiment of the present invention.
FIG. 3 shows a horizontal reinforced drainage arrangement for a composite geotextile material-gravel cushion layer of a pavement structure implemented by the invention
Fig. 4 is a plan view of a horizontal reinforced drainage arrangement of a composite geotextile material-gravel cushion layer of a pavement structure in accordance with an embodiment of the present invention.
Fig. 5 is a cross-section of a composite geotextile material in accordance with an embodiment of the present invention.
FIG. 6 is a flow chart of the construction process of the present invention.
Detailed Description
The new technology construction sequence of the horizontal reinforced drainage of the composite geotechnical material-gravel cushion layer of the pavement structure comprises the following steps: leveling roadbed soil, laying a geomembrane, laying a composite geotechnical material, laying a broken stone cushion layer, arranging a longitudinal drainage and water collecting well and the like. The construction process flow is shown in figure 6.
Before construction, the hydrogeological conditions of site engineering should be verified, and in the construction process, if differences between site actual and original engineering survey reports are found, design units should be fed back in time, and design schemes should be adjusted in time.
In the preparation stage before construction, inspection of main engineering materials entering a field is finished according to design requirements, the used engineering materials meet the requirements of design and relevant standards, and random sampling inspection is carried out according to the entering batch.
Construction of the composite geotechnical material: the width of the composite geotechnical material is 100mm, the thickness of the composite geotechnical material is 40mm, and the composite geotechnical material is arranged in a single layer. And wrapping with geotextile, wherein the lap joint length of the geotextile is not less than 5cm. The main drainage plate is connected by adopting a sleeve joint, the sleeve joint is made of PVC material, and the joint part is wound by geotextile to prevent foreign matters from entering.
The composite geotechnical drainage is connected with the water collecting well, the sleeve joint is made of PVC material, and the joint part is wound by geotechnical cloth to prevent foreign matters from entering.
In the new technology construction process of horizontally enhancing drainage of a pavement structure composite geotechnical material-gravel cushion layer, construction records are required to be made, and detailed character records and necessary image data are required to be provided for the following parts, such as: the record of the construction of the laying area, the arrangement and the connection of the composite geotechnical material, the connection of the composite geotechnical material and the water collecting well, the construction of the gravel cushion and the like is shown in the table 3.
Table 3 construction record of horizontal reinforced drainage of composite geotechnical material-gravel cushion layer of pavement structure
And (4) performing inspection and acceptance on the construction quality of the hidden project by horizontally reinforcing the drainage of the pavement structure composite geotechnical material-gravel cushion layer, and performing recording.
Examples of engineering applications
A project A2 standard section of 370 county roads (fast path Dongshi connecting lines) in Jinjiang city of Fujian province is started and constructed 5 and 25 days in 2018, and the construction period is 30 months. Most of geological structures along the project are silty clay, and partial sections are implemented in areas close to ponds and reservoirs, wherein roadbed construction sections which are greatly influenced by underground water are about 1.5km. During construction, the roadbed soil has high water content all the year round, and is still rubber soil after shallow excavation, replacement and filling treatment, so that the cost is high if large-scale replacement and filling are carried out. Through research in various aspects such as design, owners and colleges, the horizontal reinforced drainage of the composite geotechnical material-gravel cushion layer of the pavement structure is introduced, and the treated roadbed forms an upper-guide lower-discharge efficient drainage body at the position of the roadbed, so that the compaction degree and the resilience modulus of the whole roadbed are remarkably improved, and the design requirements can be met.
1. Preparation for construction
Designing required data: the method is characterized in that site engineering geology, hydrogeological conditions, rainfall condition pavement structure arrangement and the like are mainly used for finding out underground water burying conditions, types, water level change amplitude and rules through hydrogeological survey and determining related technical parameters of seepage analysis.
Before construction, the hydrogeological conditions of site engineering should be verified, and in the construction process, if differences between site actual and original engineering survey reports are found, design units should be fed back in time, and design schemes should be adjusted in time.
In the preparation stage before construction, inspection of main engineering materials entering a field is finished according to design requirements, the used engineering materials meet the requirements of design and relevant standards, and random sampling inspection is carried out according to the entering batch.
And arranging the on-site measurement control points according to the coordinates and the elevation of the measurement control points, and setting permanent measurement control points. The control points provided by owners and design houses are positioned and paid off on the ground, and the control points comprise middle piles, side piles and the like of a pavement structure.
2. Subgrade soil leveling
And excavating or backfilling the roadbed soil body to the elevation of the designed road bed according to the measurement point position and the elevation, and leveling.
3. Laying geomembrane
After the roadbed soil body is leveled, impurities such as broken stones which possibly puncture the geomembrane are cleaned, a 5cm sand cushion layer is laid, and the geomembrane has two functions: on one hand, the underground water is prevented from rising to erode and damage a pavement structure layer, and on the other hand, the rainwater on the pavement is prevented from infiltrating and soaking a roadbed soil layer to soften a roadbed soil body. When the sand cushion is laid, the sand cushion layer is pressed to be flat, and the supporting effect of the supporting layer is enhanced. The film material is firstly put into a road bed groove, one end of the film material is vertical to the axis of a road, the film is unfolded from bottom to top, and the film material is bonded one by one.
4. Composite geotextile material laying
After the geomembrane is laid, composite geonets are laid according to the design requirement, and the composite geonets mainly play a role in drainage. The composite geotechnical materials are connected by adopting straight-through joints, tee joints and four-way joints with corresponding specifications and are connected with longitudinal drainage pipes, the connecting parts are wrapped with geotechnical cloth and are tightly adhered by using adhesive tapes, and the longitudinal drainage pipes are connected with a water collecting well or the nearest rainwater port. The sleeve joint is made of PVC materials, and the joint part is wound by geotextile to prevent foreign matters from entering.
5. Laying geotextile and gravel cushion
After the composite geotechnical material is laid, firstly, a layer of geotechnical cloth is laid, and then a broken stone cushion layer is laid, wherein the thickness is 10cm, the particle size is not more than 10mm, the grading is good, and the compactness is not less than 0.80. The gravel cushion layer has the function of eliminating capillary retardation, and the geotextile has the function of protecting the geomembrane and simultaneously enhancing the transverse restraint function.
6. Construction of pavement structure layer
After the installation of the upper bundling drain pipe is finished, geotextile laying is carried out, the geotextile laying should be smooth, the lap joint length meets the construction requirements, and the pavement structure layer construction can be carried out after the laying is finished.
The project application of project A2 standard section of 370 county-level road (fast-path east stone connecting line) in Jinjiang city shows that the original design adopts 400mm × 400mm tubular blind ditches (
The double-wall perforated corrugated pipe is 300g/m & lt 2 & gt of non-woven geotextile), the cost per square meter is 87.5 yuan, if the roadbed is changed and filled, the changing and filling depth needs to be calculated by more than 1m at least, and the cost required by changing and filling is 85 yuan per square cost; the manufacturing cost of the horizontal reinforced drainage per square meter of the composite geotechnical material-broken stone cushion layer with the pavement structure is only 45 yuan, the average construction cost is reduced by 40 yuan per square meter, and the economic benefit is obvious. Meanwhile, the construction speed is high, and the influence on other construction procedures is small.
Claims (2)
1. A composite geotechnical material-gravel cushion layer horizontal enhanced drainage technology and a construction process thereof are characterized in that: the composite geotechnical material consists of polypropylene fiber non-woven fabrics (303) and a drainage network (305), wherein geotechnical cloth (302) and gravels (301) are laid on the upper part of the composite geotechnical material, and a geotechnical film (306) is laid on the lower part of the composite geotechnical material; the pavement structure is divided into an asphalt layer (1), a base layer (2), a composite geotechnical material-broken stone cushion layer horizontal direction reinforced drainage system (3) and a roadbed (4) from top to bottom; the drainage system can transport the moisture horizontally to the water collecting well or the nearest gully (5); the broken stone cushion layer can eliminate capillary blocking effect, realize quick elimination of road surface structure layer infiltration water and capillary rising water under unsaturated state, alleviate the road surface structure damage of infiltration water and capillary rising water, set up impervious geomembrane and also can prevent that water from further infiltrating the road bed soil body and reducing road bed soil body intensity simultaneously, improve road surface structure and road bed soil body bearing capacity.
2. The horizontal reinforced drainage technology of the composite geotechnical material-broken stone cushion layer and the construction process thereof are characterized by comprising the horizontal reinforced drainage technology of the composite geotechnical material-broken stone cushion layer as claimed in claim 1, and the construction process comprises the following steps:
1) Construction preparation and inspection of approach materials;
2) Leveling a roadbed soil body, and paving a 5cm fine sand cushion layer;
3) Laying a geomembrane;
4) Laying a composite geotechnical material;
5) Laying geotextile and a gravel cushion layer;
6) And (5) constructing a pavement structure layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211032701.4A CN115613410A (en) | 2022-08-26 | 2022-08-26 | Horizontal reinforced drainage technology of composite geotechnical material-broken stone cushion layer and construction process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211032701.4A CN115613410A (en) | 2022-08-26 | 2022-08-26 | Horizontal reinforced drainage technology of composite geotechnical material-broken stone cushion layer and construction process thereof |
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