CN113005839A - Treatment process of bad soil roadbed - Google Patents
Treatment process of bad soil roadbed Download PDFInfo
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- CN113005839A CN113005839A CN202110274847.9A CN202110274847A CN113005839A CN 113005839 A CN113005839 A CN 113005839A CN 202110274847 A CN202110274847 A CN 202110274847A CN 113005839 A CN113005839 A CN 113005839A
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
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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
- E01C3/04—Foundations produced by soil stabilisation
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- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Road Paving Structures (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the technical field of road construction, in particular to a treatment process of a bad soil roadbed, which comprises the following steps: the method comprises the following steps of filler selection, substrate treatment, paving and leveling, roadbed renovation, water content control, vibration rolling, detection and identification, roadbed molding and slope renovation, wherein the filler selected comprises the following raw materials in parts by weight: 200-250 parts of expansive soil, 10-20 parts of hydrated lime and 15-25 parts of cement, wherein the water content of the filler is 0-4%, the invention adopts a concentrated premixing road mixing method construction process for improving the bad soil to fill the roadbed by the hydrated lime so as to achieve the purpose of enhancing the strength and the water stability, the mixture is placed for several hours for stewing, so that the optimal water content of the mixture is about 1%, the colors of the mixture are consistent, the engineering cost is greatly reduced, the filling and digging in the roadbed can be balanced, the borrowing and the abandoning are avoided, and the quality of the filling is ensured.
Description
Technical Field
The invention relates to the technical field of road construction, in particular to a treatment process of a bad soil roadbed.
Background
In the road bed work progress, the trans-regional range is great, changes complicacy, often can meet unfavorable geological soil, for example silt, mucky soil, clay class weak soil that does not accord with the condition, collapsible loess, inflation soil, frozen soil etc. all belong to unfavorable geological soil category in addition, and the weak soil mostly appears in the south of china, and frozen soil mostly appears in the north. The material for constructing the roadbed, whether filling or digging, is mainly the earth-rock discrete material, so the roadbed is a geotechnical structure. The roadbed is often attacked and damaged by the change of natural conditions such as geology, water, rainfall, climate, earthquake and the like, so that the resistance is poor. It is therefore required that the foundations should have sufficient robustness, stability and durability. When road engineering meets various poor soil subgrades, construction can be carried out after the treatment is needed to meet the requirement of the subgrade, otherwise, the road is easily damaged in the running process of the road.
Disclosure of Invention
The invention aims to provide a treatment process of a poor soil roadbed so as to solve the problem that the poor soil roadbed is easy to damage a road in the road operation process.
In order to achieve the purpose, the invention provides the following technical scheme:
a treatment process of a bad soil roadbed specifically comprises the following steps: the method comprises the following steps of filler selection, substrate treatment, paving and leveling, roadbed renovation, water content control, vibration rolling, detection and identification, roadbed molding and slope renovation, wherein the filler selected by the filler comprises the following raw materials in parts by weight: 200-250 parts of expansive soil, 10-20 parts of hydrated lime and 15-25 parts of cement, and the water content of the filler is 0-4%.
Preferably, the particle size of the hydrated lime is 0.1 to 0.3 mm.
Preferably, the foundation treatment is carried out by performing construction measurement, lofting and compaction process tests, and then corresponding methods and measures are adopted for treating the foundation according to the soil property of the foundation, the natural state of the foundation ground and the stability requirement of the foundation and the filling height of the embankment by combining design.
Preferably, the construction measurement and lofting is to perform retesting of the line and elevation, check and add leveling points and control piles according to drawings and relevant regulations before start-up, measure and draw the cross section of the line, and record and form data according to the measurement result.
Preferably, before the base is treated and filled, accumulated water on the original ground is drained, sundries, sludge, tree roots and the like on the ground surface within the range of the base are removed, the original ground is leveled, the ground is cleaned, after the field is removed, the base is paved by adopting sand and gravel cushion layers, the width of the cushion layer is larger than that of the base, the two sides of the cushion layer are backfilled by adopting the same material as that of the cushion layer, the bearing capacity of the base is improved, waterproof treatment is well carried out, and then rolling is carried out before filling, so that the base reaches the specified compaction standard.
Preferably, the thickness of the sand and gravel cushion layer is 300-500 mm.
Preferably, the compaction process test specifically comprises: and (3) selecting a whole-width embankment section with the length of not less than 50m of the roadbed to carry out a rolling process test 28 days before embankment filling construction according to different fillers and compacting machines, wherein the fillers adopt native soil dug in situ, and are mixed by hydrated lime in proportion, so that the optimal process parameters are selected according to the above to guide construction and ensure the roadbed filling quality.
Preferably, the optimum process parameters include the optimum moisture content of the filler, the open thickness of the filler, the compactor type, the speed of travel, and the number of compaction passes.
Preferably, the subgrade renovation comprises the following steps:
s1: after filling to the elevation, leveling and measuring, recovering the center line, horizontally measuring, applying roadbed side piles, building road arches, and rolling once by using a smooth wheel road roller;
s2: the thickness of the surface layer of the finished roadbed is within 150mm, and materials with the size larger than 100mm cannot be left in the roadbed;
s3: the roadbed is renovated by adopting a manual or mechanical method to remove the residual soil superfilled on the two sides of the roadbed, and impurities in side ditches are removed completely to ensure smooth drainage when the roadbed is renovated.
Preferably, the slope is trimmed and reserved with a reinforcing position, when the filling is insufficient or the slope is washed by rainwater to form a small gully, the primary slope is dug into steps, and layered filling is carried out.
Compared with the prior art, the invention has the beneficial effects that:
1. the process for treating the poor soil roadbed adopts a concentrated premixing road mixing method construction process for improving the poor soil filling roadbed by using hydrated lime, utilizes the physical and chemical action of the hydrated lime and the poor soil to carry out modification treatment on the poor soil so as to achieve the aim of enhancing the strength and the water stability, places the mixture for hours to stew the material, ensures that the optimal water content of the mixture is about 1 percent, ensures that the mixture has consistent color and luster, has no ash lumps and ash strips, has proper and uniform water content, ensures that the filling compactness meets the design requirement, can reasonably utilize the excavation in the roadbed to make the filling material, greatly reduces the engineering cost, can ensure the filling balance in the roadbed, does not borrow any part, does not abandon any part, and ensures the quality of the filling part.
2. The treatment process of the bad soil subgrade adopts corresponding treatment measures according to local conditions in the technology, changes waste into useful filling materials, technically advanced, economical and reasonable, can ensure that the filling quality of people can meet the design requirements only by mixing indexes of hydrated lime and controlling the filling process well in the construction process, ensures that the arrangement is not influenced in the total construction period for 180 days, can ensure the successful realization of the contract construction period, utilizes the hydrated lime to carry out the modification treatment of the bad soil through the physical and chemical action of the bad soil, uses excavation in the subgrade as the filling materials after the treatment is qualified, greatly reduces the engineering construction cost, is feasible economically, can save 40 percent of the engineering cost, has good economic benefit in the selection and implementation of the scheme, and drives the development of a large number of related matched industries locally, the problem of difficulty in employment in poor regions is solved, the method has important significance for maintaining social stability and local economic development, and the social benefit and the economic benefit are great.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides the following technical scheme:
example 1
A treatment process of a bad soil roadbed specifically comprises the following steps: the method comprises the following steps of filler selection, substrate treatment, paving and leveling, roadbed renovation, water content control, vibration rolling, detection and identification, roadbed molding and slope renovation, wherein the filler selected comprises the following raw materials in parts by weight: 230 parts of expansive soil, 15 parts of hydrated lime and 20 parts of cement, and the water content of the filler is 1%.
In this example, the particle size of the hydrated lime was 0.2 mm.
Further, the foundation treatment is firstly carried out with construction measurement, lofting and compaction process tests, and then corresponding methods and measures are adopted for treatment according to the soil property of the foundation, the natural state of the foundation ground, the stability requirement of the foundation and the embankment filling height by combination of design.
Specifically, the construction measurement and lofting comprises the steps of retesting the line and the elevation according to a drawing and relevant regulations before the start of construction, checking and adding a leveling point and a control pile, measuring and drawing the cross section of the line, and recording and forming data according to the measurement result.
Before the foundation is treated and filled, the accumulated water on the original ground is drained, the surface miscellaneous soil, silt, sundries, tree roots and the like in the range of the foundation are removed, the original ground is leveled, the ground is cleaned, after the site is removed, the foundation is paved by adopting a sand cushion and a gravel cushion, the width of the cushion is larger than that of the foundation, the two sides of the cushion are backfilled by adopting the same material as the cushion, the bearing capacity of the foundation is improved, the waterproof treatment is well carried out, and then the rolling is carried out before the filling, so that the foundation reaches the specified compaction standard.
In this embodiment, the thickness of the sand and gravel cushion is 400 mm.
It is worth noting that the compaction process test specifically is: and (3) selecting a whole-width embankment section with the length of not less than 50m of the roadbed to carry out a rolling process test 28 days before embankment filling construction according to different fillers and compacting machines, wherein the fillers adopt native soil dug in situ, and are mixed by hydrated lime in proportion, so that the optimal process parameters are selected according to the above to guide construction and ensure the roadbed filling quality.
In this embodiment, the optimum process parameters include the optimum moisture content of the filler, the open bed thickness of the filler, the compactor type, the travel speed, and the number of compaction passes.
In addition, the subgrade renovation comprises the following steps:
s1: after filling to the elevation, leveling and measuring, recovering the center line, horizontally measuring, applying roadbed side piles, building road arches, and rolling once by using a smooth wheel road roller;
s2: the thickness of the surface layer of the finished roadbed is within 150mm, and materials with the size larger than 100mm cannot be left in the roadbed;
s3: the roadbed is renovated by adopting a manual or mechanical method to remove the residual soil superfilled on the two sides of the roadbed, and impurities in side ditches are removed completely to ensure smooth drainage when the roadbed is renovated.
It is worth to be noted that the slope is trimmed and reserved with a reinforcing position, and when the filling is insufficient or the slope is washed by rainwater to form a small gully, the primary slope is dug into steps and filled in layers.
Example 2
A treatment process of a bad soil roadbed specifically comprises the following steps: the method comprises the following steps of filler selection, substrate treatment, paving and leveling, roadbed renovation, water content control, vibration rolling, detection and identification, roadbed molding and slope renovation, wherein the filler selected comprises the following raw materials in parts by weight: 250 parts of expansive soil, 20 parts of hydrated lime and 25 parts of cement, and the water content of the filler is 2%.
In this example, the particle size of the hydrated lime was 0.3 mm.
Further, the foundation treatment is firstly carried out with construction measurement, lofting and compaction process tests, and then corresponding methods and measures are adopted for treatment according to the soil property of the foundation, the natural state of the foundation ground, the stability requirement of the foundation and the embankment filling height by combination of design.
Specifically, the construction measurement and lofting comprises the steps of retesting the line and the elevation according to a drawing and relevant regulations before the start of construction, checking and adding a leveling point and a control pile, measuring and drawing the cross section of the line, and recording and forming data according to the measurement result.
Before the foundation is treated and filled, the accumulated water on the original ground is drained, the surface miscellaneous soil, silt, sundries, tree roots and the like in the range of the foundation are removed, the original ground is leveled, the ground is cleaned, after the site is removed, the foundation is paved by adopting a sand cushion and a gravel cushion, the width of the cushion is larger than that of the foundation, the two sides of the cushion are backfilled by adopting the same material as the cushion, the bearing capacity of the foundation is improved, the waterproof treatment is well carried out, and then the rolling is carried out before the filling, so that the foundation reaches the specified compaction standard.
In this embodiment, the thickness of the sand and gravel cushion is 450 mm.
It is worth noting that the compaction process test specifically is: and (3) selecting a whole-width embankment section with the length of not less than 50m of the roadbed to carry out a rolling process test 28 days before embankment filling construction according to different fillers and compacting machines, wherein the fillers adopt native soil dug in situ, and are mixed by hydrated lime in proportion, so that the optimal process parameters are selected according to the above to guide construction and ensure the roadbed filling quality.
In this embodiment, the optimum process parameters include the optimum moisture content of the filler, the open bed thickness of the filler, the compactor type, the travel speed, and the number of compaction passes.
In addition, the subgrade renovation comprises the following steps:
s1: after filling to the elevation, leveling and measuring, recovering the center line, horizontally measuring, applying roadbed side piles, building road arches, and rolling once by using a smooth wheel road roller;
s2: the thickness of the surface layer of the finished roadbed is within 150mm, and materials with the size larger than 100mm cannot be left in the roadbed;
s3: the roadbed is renovated by adopting a manual or mechanical method to remove the residual soil superfilled on the two sides of the roadbed, and impurities in side ditches are removed completely to ensure smooth drainage when the roadbed is renovated.
It is worth to be noted that the slope is trimmed and reserved with a reinforcing position, and when the filling is insufficient or the slope is washed by rainwater to form a small gully, the primary slope is dug into steps and filled in layers.
Example 3
A treatment process of a bad soil roadbed specifically comprises the following steps: the method comprises the following steps of filler selection, substrate treatment, paving and leveling, roadbed renovation, water content control, vibration rolling, detection and identification, roadbed molding and slope renovation, wherein the filler selected comprises the following raw materials in parts by weight: 200 parts of expansive soil, 10 parts of hydrated lime and 15 parts of cement, and the water content of the filler is 1%.
In this example, the particle size of the hydrated lime was 0.1 mm.
Further, the foundation treatment is firstly carried out with construction measurement, lofting and compaction process tests, and then corresponding methods and measures are adopted for treatment according to the soil property of the foundation, the natural state of the foundation ground, the stability requirement of the foundation and the embankment filling height by combination of design.
Specifically, the construction measurement and lofting comprises the steps of retesting the line and the elevation according to a drawing and relevant regulations before the start of construction, checking and adding a leveling point and a control pile, measuring and drawing the cross section of the line, and recording and forming data according to the measurement result.
Before the foundation is treated and filled, the accumulated water on the original ground is drained, the surface miscellaneous soil, silt, sundries, tree roots and the like in the range of the foundation are removed, the original ground is leveled, the ground is cleaned, after the site is removed, the foundation is paved by adopting a sand cushion and a gravel cushion, the width of the cushion is larger than that of the foundation, the two sides of the cushion are backfilled by adopting the same material as the cushion, the bearing capacity of the foundation is improved, the waterproof treatment is well carried out, and then the rolling is carried out before the filling, so that the foundation reaches the specified compaction standard.
In this embodiment, the thickness of the sand and gravel cushion is 320 mm.
It is worth noting that the compaction process test specifically is: and (3) selecting a whole-width embankment section with the length of not less than 50m of the roadbed to carry out a rolling process test 28 days before embankment filling construction according to different fillers and compacting machines, wherein the fillers adopt native soil dug in situ, and are mixed by hydrated lime in proportion, so that the optimal process parameters are selected according to the above to guide construction and ensure the roadbed filling quality.
In this embodiment, the optimum process parameters include the optimum moisture content of the filler, the open bed thickness of the filler, the compactor type, the travel speed, and the number of compaction passes.
In addition, the subgrade renovation comprises the following steps:
s1: after filling to the elevation, leveling and measuring, recovering the center line, horizontally measuring, applying roadbed side piles, building road arches, and rolling once by using a smooth wheel road roller;
s2: the thickness of the surface layer of the finished roadbed is within 150mm, and materials with the size larger than 100mm cannot be left in the roadbed;
s3: the roadbed is renovated by adopting a manual or mechanical method to remove the residual soil superfilled on the two sides of the roadbed, and impurities in side ditches are removed completely to ensure smooth drainage when the roadbed is renovated.
It is worth to be noted that the slope is trimmed and reserved with a reinforcing position, and when the filling is insufficient or the slope is washed by rainwater to form a small gully, the primary slope is dug into steps and filled in layers.
The treatment process of the bad soil roadbed specifically comprises the following steps: the filling subgrade has to control the filling elevation according to the parallel lines of the road surface in layers, the filling operation should be paved in layers and in parallel, the layers of the layered filling should be leveled, the requirement of leveling the longitudinal slope is met, the accumulated water is not produced, and the filling and rolling quality is not influenced. Strictly implement the procedures of grid cutting, soil feeding, line hanging construction and leveling by using a grader. After the transport vehicle discharges materials according to the requirement, firstly, the bulldozer roughly levels the materials, then, the grader finely levels the materials, and the transverse slopes and the longitudinal slopes with the design requirements are accurately paved according to the pile positions buried in advance by a measurer to form a road arch. And (5) excavating steps according to design requirements for the half-filled and half-excavated roadbed. When the excavation area is soil, performing over excavation on the soil within the range of 80cm of the road bed of the excavation area, backfilling and rolling by using a material with good water permeability, and paving a geogrid and arranging a blind ditch according to design requirements; when the excavation area is hard rock, a stone filling roadbed is preferably adopted. When the filling embankment is constructed in a plurality of operation sections, if filling is carried out at different time at the junction of the two sections, the filling section is filled layer by layer according to the gradient of 1:1, each layer of rolling must be carried out to the edge, the slope is collected layer by layer, when the filling section is filled in place, the interface is dug into a step with the width of 2m, and the steps are filled and rolled layer by layer; when two sections are constructed simultaneously, the sections are overlapped alternately, and the overlapping length is not less than 2 m. Before rolling, the loose paving thickness and the flatness of the fill layer are checked, and rolling can be performed after the requirements are met. And carrying out static pressure firstly and then vibrating and rolling. And during rolling, the straight-line roadbed is constructed by adopting a method of rolling from two sides to the middle. The rolling running speed of the road roller does not exceed 4Km/h, no pressure leakage and no dead angle are caused by rolling, and the uniform rolling is ensured. And after the rolling times obtained in the test section are reached, the compaction degree is checked by a sand filling method, the next procedure can be carried out after the rolling passes are checked, and the unqualified part is subjected to pressure supplementing and then checked until the rolling passes are qualified. The side slope is protected by planting grass in time by adopting concrete arch lattice slope protection, the grass planting adopts a spray-seeding grass planting technology, and the edge of the road shoulder is provided with a side ditch and a slope protection way.
The invention relates to a treatment process of a bad soil roadbed, which adopts a concentrated premixing road mixing method construction process that hydrated lime is used for improving bad soil to fill the roadbed, utilizes the physical and chemical action of the hydrated lime and the bad soil to carry out modification treatment on the bad soil so as to achieve the purpose of enhancing strength and water stability, places the mixture for hours to stew the material, so that the optimal water content of the mixture is about 1 percent, the mixture achieves the consistent color and luster of the mixture, has no ash lumps and ash bars, has proper and uniform water content, and ensures that the filling compactness meets the design requirement, not only can reasonably utilize the excavation in the roadbed to make the filling material, greatly reduce the engineering cost, but also can ensure the filling balance in the roadbed, does not borrow nor abandon the foundation, and ensures the quality of the filling.
The treatment process of the bad soil subgrade adopts corresponding treatment measures according to local conditions in the technology, changes waste into useful filling materials, technically advanced, economical and reasonable, can ensure that the filling quality of people can meet the design requirements only by mixing indexes of hydrated lime and controlling the filling process well in the construction process, ensures that the arrangement is not influenced in the total construction period for 180 days, can ensure the successful realization of the contract construction period, utilizes the hydrated lime to carry out the modification treatment of the bad soil through the physical and chemical action of the bad soil, uses excavation in the subgrade as the filling materials after the treatment is qualified, greatly reduces the engineering construction cost, is feasible economically, can save 40 percent of the engineering cost, has good economic benefit in the selection and implementation of the scheme, and drives the development of a large number of related matched industries locally, the problem of difficulty in employment in poor regions is solved, the method has important significance for maintaining social stability and local economic development, and the social benefit and the economic benefit are great.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A treatment process of a bad soil roadbed is characterized by comprising the following steps: the method specifically comprises the following steps: the method comprises the following steps of filler selection, substrate treatment, paving and leveling, roadbed renovation, water content control, vibration rolling, detection and identification, roadbed molding and slope renovation, wherein the filler selected by the filler comprises the following raw materials in parts by weight: 200-250 parts of expansive soil, 10-20 parts of hydrated lime and 15-25 parts of cement, and the water content of the filler is 0-4%.
2. The process for treating a poor soil roadbed according to claim 1, wherein the process comprises the steps of: the particle size of the hydrated lime is 0.1-0.3 mm.
3. The process for treating a poor soil roadbed as claimed in claim 2, wherein the process comprises the steps of: the foundation treatment is carried out by firstly carrying out construction measurement, lofting and compaction process tests, and then adopting corresponding methods and measures for treatment according to the soil property of the foundation, the natural state of the foundation ground and the stability requirement of the foundation and the filling height of the embankment by combining design.
4. The process for treating a poor soil roadbed as claimed in claim 3, wherein the process comprises the steps of: the construction measurement and lofting specifically comprises the steps of retesting the line and the elevation according to a drawing and relevant regulations before starting operation, checking and adding a leveling point and a control pile, measuring and drawing the cross section of the line, and recording and forming data according to the measurement result.
5. The process for treating a poor soil roadbed as claimed in claim 4, wherein the process comprises the steps of: before the foundation is treated and filled, accumulated water on the original ground is drained, earth surface miscellaneous soil, silt, sundries, tree roots and the like in the range of the foundation are removed, the original ground is leveled, the ground is cleaned after being dismantled, a foundation is paved by adopting a sand cushion and a gravel cushion, the width of the cushion is larger than that of the foundation, the two sides of the foundation are backfilled by adopting the same material as that of the cushion, the bearing capacity of the foundation is improved, waterproof treatment is well carried out, and then rolling is carried out before filling, so that the foundation reaches the specified compactness standard.
6. The process for treating a poor soil roadbed as claimed in claim 5, wherein the process comprises the steps of: the thickness of the sand and gravel cushion layer is 300-500 mm.
7. The process for treating a poor soil roadbed as claimed in claim 6, wherein the process comprises the steps of: the compaction process test specifically comprises the following steps: and (3) selecting a whole-width embankment section with the length of not less than 50m of the roadbed to carry out a rolling process test 28 days before embankment filling construction according to different fillers and compacting machines, wherein the fillers adopt native soil dug in situ, and are mixed by hydrated lime in proportion, so that the optimal process parameters are selected according to the above to guide construction and ensure the roadbed filling quality.
8. The process for treating a poor soil roadbed as claimed in claim 7, wherein the process comprises the steps of: the optimum process parameters include the optimum moisture content of the filler, the open bed thickness of the filler, the compactor type, the speed of travel, and the number of compaction passes.
9. The process for treating a poor soil roadbed according to claim 8, wherein the process comprises the steps of: the roadbed renovation comprises the following steps:
s1: after filling to the elevation, leveling and measuring, recovering the center line, horizontally measuring, applying roadbed side piles, building road arches, and rolling once by using a smooth wheel road roller;
s2: the thickness of the surface layer of the finished roadbed is within 150mm, and materials with the size larger than 100mm cannot be left in the roadbed;
s3: the roadbed is renovated by adopting a manual or mechanical method to remove the residual soil superfilled on the two sides of the roadbed, and impurities in side ditches are removed completely to ensure smooth drainage when the roadbed is renovated.
10. The process for treating a poor soil roadbed according to claim 1, wherein the process comprises the steps of: and (3) reserving a reinforcing position for slope finishing, and when the filling is insufficient or the slope is washed by rainwater to form a small gully, digging the primary slope into steps and filling in layers.
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| CN202110274847.9A CN113005839A (en) | 2021-03-15 | 2021-03-15 | Treatment process of bad soil roadbed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113774893A (en) * | 2021-08-31 | 2021-12-10 | 黑龙江省水利科学研究院 | Cemented soil slope filling construction method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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