CN116479859A - Soft foundation treatment structure with composite drainage pad replacing sand cushion layer and design method - Google Patents
Soft foundation treatment structure with composite drainage pad replacing sand cushion layer and design method Download PDFInfo
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- CN116479859A CN116479859A CN202310316649.3A CN202310316649A CN116479859A CN 116479859 A CN116479859 A CN 116479859A CN 202310316649 A CN202310316649 A CN 202310316649A CN 116479859 A CN116479859 A CN 116479859A
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- drainage
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- composite drainage
- soft foundation
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- 239000002131 composite material Substances 0.000 title claims abstract description 79
- 239000004576 sand Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000013461 design Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000002689 soil Substances 0.000 claims abstract description 31
- 239000004033 plastic Substances 0.000 claims abstract description 15
- 229920003023 plastic Polymers 0.000 claims abstract description 15
- 239000012528 membrane Substances 0.000 claims abstract description 12
- 238000007596 consolidation process Methods 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 239000004744 fabric Substances 0.000 claims abstract description 4
- 239000011162 core material Substances 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 8
- 239000004746 geotextile Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 229920001821 foam rubber Polymers 0.000 claims description 3
- 230000007774 longterm Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 description 6
- -1 polypropylene Polymers 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 239000000758 substrate Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Agronomy & Crop Science (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a soft foundation treatment structure with a sand cushion replaced by a composite drainage cushion and a design method. The structure comprises: the soft soil layer is paved with transverse filter pipes connected to water-vapor separation tanks and a centralized control room on two sides of the roadbed, array plastic drain plates which are vertically and deeply distributed at equal intervals on the soft soil layer are paved below the transverse filter pipes, a composite drain pad is paved on the plastic drain plates, the composite drain pad is paved to membrane pressing grooves on two sides of the roadbed, geotechnical cloth and a vacuum membrane are paved on the composite drain pad, a embankment filling layer is filled above the vacuum membrane, and a pavement structure layer is paved above the embankment filling layer. The design method comprises the following steps: measuring the compressive strength and the water flow of the composite drainage pad; and after reaching the standard, the soft foundation treatment structure of the sand cushion layer is replaced by the composite drainage cushion. The scheme can improve drainage consolidation efficiency and greatly reduce the workload and economic cost of soft foundation treatment.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a soft foundation treatment structure with a composite drainage mat replacing a sand mat and a design method.
Background
Soft soil foundation is a common special foundation in engineering implementation process, and needs to be subjected to foundation reinforcement treatment before building or road and other infrastructure is constructed. The existing soft foundation treatment methods mainly comprise two types: 1. and (3) treating the composite soft soil foundation by adopting granular piles, powder spraying piles, cement piles and the like. 2. The drainage consolidation method is divided into preloading, vacuum preloading and vacuum-preloading treatment.
The method 1 has higher manufacturing cost, and can not be widely used because the method is evaluated according to engineering cost and necessity before implementation. The method 2 has good economy, is a more common soft foundation treatment means, but the drainage consolidation process causes a longer construction period, and meanwhile, the drainage-dependent sand cushion layer increases the construction cost and the filling height of the structures on the soft foundation.
From the economical and practical point of view, based on the drainage consolidation method, the soft foundation treatment structure and method for improving the drainage consolidation efficiency are provided, so that the workload and the economic cost of soft foundation treatment can be greatly reduced, and the soft foundation treatment structure and method are basically suitable for the treatment of various soft foundations.
Disclosure of Invention
The invention provides a soft foundation treatment structure with a composite drainage mat replacing a sand mat layer and a design method. The method provides a system, reasonable screening of the composite drainage pad and a design flow of the soft foundation treatment structure of the composite drainage pad instead of the sand cushion, effectively improves the consolidation drainage efficiency of the soft foundation, and solves the problems of high use cost and overlarge layer thickness of the sand cushion.
The invention mainly adopts the following technical scheme:
the utility model provides a soft foundation treatment structure of compound drainage mat replacement sand bed course, roadbed structure includes soft soil layer, soft soil layer upper berth has the horizontal filter tube that connects to roadbed both sides vapor separation jar and centralized control room, vertical array plastics drain bar that deep soft soil layer equidistantly distributes is laid to horizontal filter tube below, compound drainage mat has been laid on the plastics drain bar, compound drainage mat spreads to roadbed both sides pressure membrane ditch, compound drainage mat upper berth has geotechnique's cloth and vacuum membrane, the embankment is filled to vacuum membrane top, the road surface structural layer is laid to embankment filled to the soil top.
Further, the transverse filter tube is a horizontal tubular structure parallel to the road cross section.
Further, the plastic drainage plates are arranged in a square array plane, the spacing is S, and the vertical inserting range is a range extending 1-2m outside the toe lines on two sides of the road.
Further, the composite drainage mat is formed by bonding a three-dimensional polypropylene drainage net mat and an upper layer of polypropylene filament spun-bonded geotextile and a lower layer of polypropylene filament spun-bonded geotextile.
Further, the film pressing groove is at least 1m away from the slope foot line of the embankment, the groove is a strip-shaped groove with an inverted trapezoid cross section and extends along the direction of the central line of the road, and the depth is at least 2m.
Furthermore, the plastic drainage plate combines with a preloading mode, under the action of the pressure of the water in the gap, water is rapidly discharged from the soft soil base, the composite drainage pad is used as a drainage layer, and the water discharged from the base is collected in the filter pipe and horizontally discharged to the water-vapor separation tanks at two sides of the road, so that the soft foundation achieves the rapid consolidation effect, and the bearing capacity and stability of the soft soil base are improved.
In addition, the invention also provides a design method of the soft foundation treatment structure of the composite drainage mat instead of the sand mat, which comprises the following steps: the method comprises the following steps:
(1) Selecting the specification of the composite drainage pad;
(2) Measuring the compressive strength and the water flow of the composite drainage pad; if the measurement does not reach the standard, repeating the steps (1) - (2) until the design standard is reached;
(3) And determining the specification of the composite drainage pad, and using the composite drainage pad to replace a soft foundation treatment structure of the sand cushion layer, and carrying out drainage consolidation based on the soft foundation structure of the composite drainage pad.
Further, the compressive strength is measured specifically as: the embankment filling layer and the pavement structure layer are simplified into homogeneous soil bodies, additional load above the pavement structure is applied to the composite drainage pad together, and whether the ultimate compressive strength of the drainage pad material is larger than the structural load is measured.
Further, the strength conditions in the design meet the following conditions:
intensity conditions: r is R s ≥γ·H+q
Wherein said R is s The compressive strength of the composite drainage mat is shown, gamma is the volume weight of the simplified homogeneous soil mass, H is the height of the covering soil mass on the composite drainage mat, and q is the additional load on the pavement structure.
Further, the specific process for measuring the water flow of the composite drainage pad is as follows:
the composite drainage mat (13) is placed between the base plate (14) and the closed-cell foam rubber (12) and a constant uniform load sigma is applied to the composite drainage mat, and the load is equal to the sum of the loads on the soft foundation calculated in claim 7. Adjusting and stabilizing the head height difference between the upstream water tank and the downstream water tank to be a fixed value delta h, wherein the hydraulic gradient isMeasuring the water storage quantity Q in the water storage tank in t=120, and calculating to obtain the short-term plane water flow quantity +.>
Further, the drainage conditions in the design meet the following conditions:
wherein Q is a For the long-term water flow capacity of the composite drainage pad, Q L Representing laboratory measured composite rowsShort-term planar water flow of water pad, F lr An empirical parameter (in the test, rigid-rigid contact, and in the test, flexible-flexible contact, the value here being 1) indicating when the contact surface condition differs from the actual contact condition when the measured short-term planar water flow is taken to be RF in Represents the reduction coefficient (value range 1-1.5) of the filter nonwoven geotechnical intrusion drainage core material, RF cr Represents the compressive creep reduction coefficient (the value range is 1.0-6.0) of the composite drainage pad, RF cc Represents the chemical clogging reduction coefficient (the value range is 1.0-3.0) of the drainage core material, RF bc The biological clogging reduction coefficient (the value range is 1.0-3.0) of the drainage core material is shown. FS (FS) G As a safety factor, Q S Is the water flow of the sand cushion.
The invention has the following beneficial effects:
the structure utilizes the plastic drainage plate to combine with the method of stacking or vacuum preloading, the composite drainage pad provides enough strength and water-through capacity, and the drainage consolidation of soft soil is ensured. The composite drainage pad is superior to the drainage capability of the traditional sand pad layer, separates the filled soil foundation from the original foundation, and improves the bearing capacity of the base layer while improving the drainage speed. Compared with the traditional consolidation drainage soft foundation treatment method, the sand cushion problem with higher cost can be solved, sand and stone transportation can be reduced, and the method meets the existing green low-carbon theme. Provides a stable, economical and widely applicable soft foundation treatment technical means for soft foundation treatment.
Drawings
FIG. 1 is a flow chart of a design method of the present invention;
FIG. 2 is a schematic view of a soft foundation treatment structure according to the present invention;
FIG. 3 is a schematic diagram showing the water flow test of the composite drainage mat according to the present invention.
The numbers in the figure are as follows:
1 is a soft soil layer; 2 is a water-vapor separating tank at two sides of the roadbed; 3 is a transverse filter tube; a transverse filter tube; 4 is a plastic drainage plate; 5 is a composite drainage pad; 6 is a film pressing groove; 7 is geotextile; 8 is a vacuum film; 9 embankment filling layers; 10 is a pavement structure layer; 11 is an upstream water tank; 12 is a closed cell foam rubber; 13 is a composite drainage pad; 14 is a substrate; 15 is a downstream tank; 16 is a reservoir.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Taking a soft soil roadbed section as an example, the soft foundation treatment structure design of replacing the sand cushion layer with the composite drainage cushion is carried out, and the specific design flow is shown in figure 1.
1. Calculating the embankment, the road surface and the additional load on the soft foundation to obtain the minimum compressive strength of the composite drainage mat;
2. and calculating the allowable water flow of the composite drainage pad by considering various reduction factors in actual use, and checking the composite drainage pad according to the safety coefficient in the drainage pad specification.
3. And (3) replacing the traditional sand cushion with the composite drainage cushion meeting the use requirement as a drainage layer, and carrying out soft foundation treatment structural design of replacing the sand cushion with the composite drainage cushion.
As shown in fig. 2, the roadbed structure comprises a soft soil layer 1, transverse filter pipes 3 connected to water vapor separation tanks 2 on two sides of the roadbed and a centralized control room are paved on the soft soil layer, array plastic drain plates 4 which are vertically and deeply distributed in equidistance of the soft soil layer 1 are paved below the transverse filter pipes 3, a composite drain pad 5 is paved on the plastic drain plates 4, the composite drain pad 5 is paved on membrane grooves 6 on two sides of the roadbed, geotechnical cloth 7 and a vacuum membrane 8 are paved on the composite drain pad 5, a embankment filler layer 9 is filled above the vacuum membrane 8, and a pavement structure layer 10 is paved above the embankment filler layer. The transverse filter tube 3 is a horizontal tubular structure parallel to the road cross section. The plastic drain boards 4 are arranged in a square array plane, the distance is 1-1.5m, and the vertical inserting range is within 1m of the extension of the toe lines at two sides of the road. The composite drainage mat 5 is formed by bonding a three-dimensional polypropylene drainage net mat and an upper layer of polypropylene filament spun-bonded geotextile and a lower layer of polypropylene filament spun-bonded geotextile. The film pressing groove 6 is at least 1m away from the slope foot line of the embankment, the groove is a strip-shaped groove with an inverted trapezoid cross section and extends along the direction of the central line of the road, and the depth is 2m.
The plastic drainage plate combines with a preloading mode, under the action of the pressure of the water in the gap, water is rapidly discharged out of the soft soil substrate, the composite drainage pad 5 is used as a drainage layer, and the water discharged out of the substrate is collected in the filtering pipe 3 and horizontally discharged into drainage ditches at two sides of a road, so that the soft soil substrate achieves the effect of rapid solidification.
In the measuring step, the design of the soft foundation treatment structure of the composite drainage mat instead of the sand mat layer meets the following conditions:
intensity conditions:
R s ≥γ·H+q (1)
drainage conditions:
as shown in fig. 2, the embankment filling layer 9 and the pavement structure layer 10 are simplified into homogeneous soil bodies, and additional load 11 above the pavement structure is added to act on the composite drainage mat 5 together, so that the compressive strength of the drainage mat 5 material needs to be larger than the structural acting load 11.
Furthermore, under different application conditions, the allowable water flow of the composite drainage pad is based on the water flow measured in a laboratory, and the water flow obtained by considering various reduction coefficients is shown in a schematic view in fig. 3. According to the related specification requirements of the drainage pad, the use requirement of the composite drainage pad meets the safety coefficient requirement.
Further, the R s Representing the compressive strength of the composite drainage mat, gamma representing the volume weight of the simplified homogeneous soil mass, H representing the height of the casing soil mass on the composite drainage mat, Q representing the additional load on the pavement structure, Q a Representing the allowable water flow rate, Q of the long-term design of the composite drainage pad taking the reduction factor into consideration L Representing the short-term planar water flow of the composite drainage mat measured in the laboratory,F lr empirical parameters indicating when the measured short term planar water flow differs from the actual contact conditions, RF in Represents the reduction coefficient, RF, of the filtration nonwoven geotechnical intrusion drain core cr Representing the compressive creep reduction coefficient, RF, of a composite drainage mat cc Indicating the coefficient of chemical clogging and reduction, RF, of the drainage core bc The biological clogging reduction coefficient of the drainage core material is shown. FS (FS) G As a safety factor, Q S Is the water flow of the sand cushion. All of the above parameters can be obtained by experiment or consulting a drainage core materials manual.
Claims (10)
1. The utility model provides a soft foundation treatment structure of compound drainage mat replacement sand bed course, roadbed structure includes soft soil layer (1), its characterized in that, soft soil layer (1) upper berth has transverse filter tube (3) that connect to roadbed both sides vapor separation jar (2) and centralized control room, plastic drainage board (4) that vertical deep soft soil layer and array distribute are laid to transverse filter tube (3) below, compound drainage mat (5) have been laid on plastic drainage board (4), compound drainage mat (5) are spread to roadbed both sides pressure membrane ditch (6), compound drainage mat (5) upper berth has geotechnique's cloth (7) and vacuum membrane (8), embankment filling layer (9) are filled to vacuum membrane (8) top, pavement structure layer (10) are laid to embankment filling layer (9) top.
2. The soft foundation treatment structure of a composite drainage mat instead of a sand mat according to claim 1, characterized in that the transversal filter tubes (3) are of a horizontal tubular structure parallel to the road cross section.
3. The soft foundation treatment structure for replacing sand cushion with composite drainage cushion according to claim 1, wherein the plastic drainage plates (4) are arranged in square or quincuncial array planes, the spacing is S, and the vertical inserting range is within 1-2m of the outer extension of the toe lines of two sides of the road.
4. The soft foundation treatment structure of the composite drainage mat instead of the sand mat according to claim 1, wherein the composite drainage mat (5) is formed by bonding a drainage net mat and an upper geotextile and a lower geotextile.
5. The soft foundation treatment structure of the composite drainage mat instead of the sand mat according to claim 1, characterized in that the film pressing groove (6) is at least 1m away from the road embankment slope foot line, extends along the direction of the road center line, and has a depth of at least 2m.
6. A design method of a soft foundation treatment structure of a composite drainage mat instead of a sand mat layer is based on the soft foundation treatment structure of any one of claims 1-5, and is characterized in that,
selecting the specification of the composite drainage pad;
measuring the compressive strength and the water flow of the composite drainage pad; if the measurement does not reach the standard, the specification is improved, and the composite drainage pad is selected again for measurement;
and determining the specification of the composite drainage pad, and using the composite drainage pad to replace a soft foundation treatment structure of the sand cushion layer, and carrying out drainage consolidation based on the soft foundation structure of the composite drainage pad.
7. The method for designing a soft foundation treatment structure for replacing a sand bedding layer with a composite drainage mat according to claim 6, wherein the compressive strength is determined specifically by:
the embankment filling layer and the pavement structure layer are simplified into homogeneous soil bodies, additional load above the pavement structure is applied to the composite drainage mat together, and whether the compressive strength of the drainage mat material is larger than the structural load is measured.
8. The method for designing a soft foundation treatment structure of a composite drainage mat instead of a sand mat according to claim 6, wherein the strength conditions in the design meet the following conditions:
intensity conditions: r is R s ≥γ·+
Wherein said R is s The compressive strength of the composite drainage mat is shown, gamma is the volume weight of the simplified homogeneous soil mass, H is the height of the covering soil mass on the composite drainage mat, and q is the additional load on the pavement structure.
9. The method for designing a soft foundation treatment structure for replacing a sand cushion with a composite drainage cushion according to claim 6, wherein the water flow measurement is specifically:
placing a composite drainage mat (13) between a base plate (14) and closed-cell foam rubber (12), and applying a constant uniform load sigma to the composite drainage mat, wherein the load is equal to the sum of loads on the soft foundation calculated in claim 7; adjusting and stabilizing the head height difference between the upstream water tank and the downstream water tank to be a fixed value delta h, wherein the hydraulic gradient isMeasuring the water storage quantity Q in the reservoir within the time t, and calculating to obtain the short-term plane water flow quantity +.>
10. The method for designing a soft foundation treatment structure of a composite drainage mat instead of a sand mat according to claim 6, wherein the drainage conditions in the design meet the following conditions:
wherein Q is a For the long-term water flow capacity of the composite drainage pad, Q L Representing short-term planar water flow rate of composite drainage pad measured in laboratory, F lr Empirical parameters indicating when the measured short term planar water flow differs from the actual contact conditions, RF in Represents the reduction coefficient, RF, of the filtration nonwoven geotechnical intrusion drain core cr Representing the compressive creep reduction coefficient, RF, of a composite drainage mat cc Indicating the coefficient of chemical clogging and reduction, RF, of the drainage core bc Representing the biological clogging reduction coefficient of the drainage core material, FS G As a safety factor, Q S Is the water flow of the sand cushion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310316649.3A CN116479859A (en) | 2023-03-28 | 2023-03-28 | Soft foundation treatment structure with composite drainage pad replacing sand cushion layer and design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310316649.3A CN116479859A (en) | 2023-03-28 | 2023-03-28 | Soft foundation treatment structure with composite drainage pad replacing sand cushion layer and design method |
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| Publication Number | Publication Date |
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| CN116479859A true CN116479859A (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310316649.3A Pending CN116479859A (en) | 2023-03-28 | 2023-03-28 | Soft foundation treatment structure with composite drainage pad replacing sand cushion layer and design method |
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| Country | Link |
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| CN (1) | CN116479859A (en) |
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2023
- 2023-03-28 CN CN202310316649.3A patent/CN116479859A/en active Pending
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