CN114108407A - Construction method of strong-alkali saline soil subgrade in plateau cold and arid region - Google Patents
Construction method of strong-alkali saline soil subgrade in plateau cold and arid region Download PDFInfo
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- 239000011780 sodium chloride Substances 0.000 title claims abstract description 51
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 49
- 238000010276 construction Methods 0.000 title claims abstract description 38
- 239000003513 alkali Substances 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000945 filler Substances 0.000 claims abstract description 26
- 150000003839 salts Chemical class 0.000 claims abstract description 16
- 238000005192 partition Methods 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 4
- 238000011049 filling Methods 0.000 claims description 61
- 238000005056 compaction Methods 0.000 claims description 40
- 238000005096 rolling process Methods 0.000 claims description 40
- 239000010410 layer Substances 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 29
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- 230000003628 erosive effect Effects 0.000 claims description 4
- 239000013505 freshwater Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000005536 corrosion prevention Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
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- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
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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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- 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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- Structural Engineering (AREA)
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Abstract
The invention discloses a construction method of a strong alkali saline soil roadbed in a plateau cold drought region, which strengthens the utilization rate of an earth excavation space, reduces ecological environmental protection damage, improves construction quality, has obvious effects of cost reduction and efficiency improvement, greatly reduces the occurrence probability of related diseases and effectively reduces the later maintenance investment cost by the construction quality measures of roadbed filler selection, original ground treatment, arrangement of a geomembrane (cloth) partition layer, water content control, compactness control, structure anticorrosion, special roadbed treatment and the like. The invention effectively solves the problems of salt expansion, solution, slurry turning, corrosion, secondary salinization and the like caused by strong alkaline salinized soil in the plateau cold and arid region on roadbed engineering, provides a more advanced construction method for similar engineering construction, and has wide popularization and application prospects.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a construction method of a strong alkali saline soil subgrade in a plateau cold arid region.
Background
The peripheral area of the abdominal land of the firewood wood basin belongs to the arid climate of the plateau desert in the warm temperature zone, and has large day and night temperature difference, strong illumination, cold, dry and anoxic. The average annual temperature is 4.14 ℃, the lowest temperature is-29.5 ℃, the maximum frozen soil depth is 229 cm, and the frost-free period is about 90 days; the annual average precipitation is 41.3 mm, and the annual average precipitation of the old cliff is less than 15 mm; the average annual evaporation amount reaches 2692.1 mm. The saline soil in the construction area is widely distributed, and the total length of the saline soil road sections is 7786.7m/14, which accounts for 59.9% of the total length of the road.
The roadbed engineering construction difficulty in the environments of cold, drought, desert, wide distribution of saline soil and the like in the western and sea areas of Qinghai province is higher, diseases such as salt expansion, solution, slurry turning, corrosion, secondary salinization and the like caused by the strong-base saline soil in the cold and arid plateau areas can be caused to the roadbed engineering, meanwhile, the utilization rate of an earthwork is lower, ecological environment protection damage is easily caused, the construction quality is difficult to guarantee, the probability of occurrence of related diseases is higher, the later-period maintenance investment cost is higher, and the like.
Disclosure of Invention
The invention aims to provide a construction method of a strong alkali saline soil subgrade in a plateau cold drought area, which can greatly reduce the occurrence probability of related diseases and effectively reduce the later-stage maintenance investment cost by controlling the quality in the aspects of arranging a partition layer, strengthening the compactness of a filler, controlling the water content of the filler, preventing corrosion of a structure and the like.
The method for constructing the strong alkali saline soil subgrade in the plateau cold arid region comprises the following steps:
s1, original ground processing: the removal of the saline soil and the saline soil on the surface layer of the roadbed base is enhanced, the removal thickness is strictly executed according to the designed thickness, and the depth can be locally increased so as to prevent the secondary salinization of the roadbed;
s2, roadbed filling water: performing a water quality analysis test before filling, and spraying fresh water when the roadbed is filled with non-saline soil; sprinkling brine when the roadbed is filled with weak saline soil, and sealing the roadbed to ensure that the water content of the roadbed filler is uniform and feasible;
s3, roadbed filling: before loading a roadbed, construction lofting is carried out, the center line and side line of the roadbed are lofted, a filler square grid is determined according to the specification of a transport vehicle, meanwhile, the elevation before filling is measured, the filler is paved and roughly leveled by a bulldozer, a grader is finely leveled, the filler is measured, the virtual pavement thickness is determined, and the filling thickness is ensured;
s4, laying an insulating layer: laying a partition layer at the bottom of the roadbed to prevent moisture and salt from entering the roadbed layer and avoid eroding the roadbed surface layer;
s5, compaction construction: rolling the roadbed by using a 26T vibratory roller;
s6, corrosion prevention of a structure: and (4) painting the surface of the structure by adopting an insulating material.
Preferably, in the step S1, the pit with the thickness of 30cm is removed, the pit in the roadbed is filled and tamped for one time, and is rolled to ensure that the compaction degree reaches more than 93%, when the original ground is steeper than 1:5, the step is dug from bottom to top, the width of the step is more than or equal to 2m, the height of the step is 0.3m, and the step is inclined inwards by 4% of slope, so as to ensure the stability of the filled roadbed.
Preferably, the construction lofting in S3 includes the following steps:
s31: preparing before lofting: carefully checking a design drawing, calculating the distance from each section slope foot point to a central line according to the design drawing, calculating the coordinates of a pile and a slope foot pile in each section according to curve parameter programming, using a control point provided by design, using a total station to discharge a control pile in a embankment filling area according to a coordinate method, and marking a pile number and a central filling height;
s32: construction lofting: constructing and setting out each filling layer, and releasing a filling layer center line and a filling sideline; in order to ensure the compaction effect of the edge part of the filling layer, the filling layer is properly widened than the roadbed structure, each edge is widened by 50cm, and after filling, a slope is brushed according to the structural width, wherein the slope brushing method comprises the steps of marking the filling side line of the roadbed by lime, respectively arranging a side pile 30cm outside the two side lines of the roadbed every 20m on the straight line section, and marking the side pile by red paint to determine the cross section.
Preferably, the filler in S3 comprises the following steps:
s33: material distribution: spreading the non-saline soil or weak saline soil in selected stock ground by pulling and conveying the non-saline soil or weak saline soil according to the distribution
Stacking intervals, after square grids are drawn, the filler is layered horizontally, and is discharged from the lower part, the higher part, the two sides and the center; when the embankment is filled, longitudinal full-section horizontal layered filling is adopted according to a designed section, layered filling is started from the lowest position, and layer-by-layer compaction is carried out, wherein the compaction thickness is less than 25 cm;
s34: spreading and roughly flattening: a height control line is set to control the loose thickness which is less than or equal to 30cm,
the filler is roughly leveled by a bulldozer to ensure that the layer surface is smooth and uniform;
s35: sprinkling water and sealing materials: the qualified construction water is adopted to uniformly sprinkle and blank the filler,
the optimal water content is achieved to be +1 percent.
Preferably, the compacting construction in the step S5 includes the following steps:
s51: secondary leveling and compacting: after the roadbed filling is stuffy, stabilizing the pressure once by using a road roller, immediately primarily leveling again by using a land leveler, rapidly and statically pressing once on a section which is just primarily leveled immediately by using the road roller, and finely leveling once by using the land leveler;
the rolling is performed by adopting a vibratory roller to stabilize the pressure firstly, then slowly and quickly, from weak vibration to strong vibration, the rolling wheel traces of the vibratory roller are overlapped by 0.4-0.5m until no obvious wheel traces exist, the rolling is performed according to the principle of firstly lightening and then weighting, firstly carrying out static pressure and then carrying out vibration pressure, and the rolling is performed by overlapping 1/3 wheel width;
s52: and (3) detecting the compactness: the test section adopts a 1-1-N-1 combination mode to carry out rolling, namely a 22t roller is adopted to carry out 1-time static pressure, a 22t roller is adopted to carry out 1-time weak vibration, a 26t roller is adopted to carry out N-time strong vibration and a 22t roller is adopted to carry out 1-time static pressure, in order to determine the relation between the compaction degree and the rolling times, the compaction degree tracking detection is carried out every 1 time of rolling, and the compaction degree can reach more than 93 percent when the roller is vibrated and compacted for 4 times according to the compaction degree detection result; the compaction degree can reach more than 95 percent when the vibration compaction is carried out for 5 times.
Preferably, in the step S4, the partition layer is a composite geomembrane with the density of more than or equal to 360 g/square meter.
Preferably, the loose coefficient in step S3 is 1.23.
Preferably, in the step S51, every 100-150 m is used as a rolling operation surface, the edge of the roadbed is stabilized once before rolling, and the principle that the edge is pressed first and then the middle, the pressing is performed first and then the pressing is performed again, and the principle that the pressing is slow first and then the pressing is fast is followed.
Preferably, the step S52 tests: in order to prevent the transfer of salt and ensure the stability of the roadbed, the compactness of the roadbed is improved by 1-2%.
The invention has the beneficial effects that:
(1) the method comprises the steps of treating the original ground, removing saline-alkali soil on the surface layer, leveling and rolling after airing; meanwhile, a drainage system around the roadbed is preferably perfected, so that rainwater is prevented from entering the roadbed to cause salt dissolution, the roadbed is unstable and compact under the action of load, and the strength index of soil is obviously reduced to cause roadbed subsidence and sinking;
(2) the invention summarizes that the fresh water is sprayed when the non-saline soil is used as the roadbed filling material by strictly controlling the water quality and the water content of the roadbed filling material; when the saline soil is adopted as the roadbed filling material, a brine sprinkling mode is adopted;
(3) according to the invention, the rolling process is adopted to strictly execute the multiple rolling of the result of the test section, the principle of firstly rolling the edge and then rolling the middle, firstly lightly pressing and then heavily pressing, and firstly slowly pressing and then quickly pressing is followed, the rolling is longitudinally parallel, 1/2 rolling is staggered, the phenomenon that the rolling cannot reach the edge is avoided, the salt transfer is prevented, the stability of the roadbed is ensured, and the compactness of the roadbed is properly improved compared with the normal roadbed compactness standard;
(4) according to the invention, the highway subgrade is constructed in medium, strong or over-saline soil areas, a geomembrane (cloth) partition layer needs to be laid, and the soil laying position is suitable to be arranged at the bottom of the subgrade, so that on one hand, moisture and salt entering the upper part of the subgrade are reduced, and salt expansion is effectively prevented; on the other hand, the water and salt are prevented from entering the pavement, so that the salinization of the pavement is prevented; the geomembrane (cloth) used as the partition layer has impermeability, corrosion resistance, ageing resistance, freezing resistance and certain strength, and meanwhile, the roadbed filling material is filled by non-saline soil or weak saline soil.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a process flow chart of the construction method of the strong alkali saline soil subgrade in the plateau cold arid region.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Referring to fig. 1, the salinized soil road section is widely distributed, the stratum is mainly gravel soil, white saline-alkali substances are separated out on the surface, and the substance components are mainly sulfate and chloride; the process comprises the following specific steps:
s1: treating the original ground: the removal of the saline soil and the saline soil on the surface layer of the roadbed base is enhanced, the removal thickness is strictly executed according to the designed thickness, and the depth can be locally increased so as to prevent the secondary salinization of the roadbed; when the water content of the original foundation soil layer exceeds the liquid limit, all the filling materials with strong water permeability are replaced, and when the water content of the original foundation soil layer is between the liquid limit and the plastic limit, coarse-grained soil with strong water permeability and more than 10cm is paved;
s2: and (3) roadbed filling water use: and performing a water quality analysis test before filling, sprinkling fresh water when the roadbed is filled with non-saline soil, sprinkling brine when the roadbed is filled with weak saline soil, and sealing the materials to ensure that the water content of the roadbed filler is uniform and feasible.
S3: roadbed filling: before the roadbed is fed with materials, the center line and the side line of the roadbed are lofted, the filler square grid is determined according to the specification of a transport vehicle, the elevation before filling is measured, the filler is paved roughly by a bulldozer, the leveler is finely leveled, the filler is measured, the virtual paving thickness (the loose paving coefficient is 1.23) is determined, and the filling thickness is ensured.
The excavated soil is used for filling, and the construction problems of long material source design, no spoil area, damage to the original ecological environment and the like are successfully solved. The problems of soil sampling field, the transportation of the abandoned earthwork and the ecological environment protection are greatly reduced, the investment of transportation machinery and temporary land utilization and the fuel consumption are effectively reduced, and the project construction cost is greatly saved.
S4: lay two cloth a membrane separation layer at the bottom of the roadbed and prevent moisture and salinity from getting into the roadbed layer and avoid eroding the roadbed surface layer.
S5: the compaction construction process comprises the following steps: and (3) rolling by using a 26T vibratory roller, wherein every 100-150 m of the vibratory roller is a rolling operation surface, the edge of the roadbed is stabilized once before rolling, and the principle of firstly pressing the edge and then the middle, firstly pressing lightly and then pressing heavily, and firstly slowing and then speeding is followed. Testing and detecting: in order to prevent the transfer of salt and ensure the stability of the roadbed, the compaction degree of the roadbed is properly improved by 1-2%.
S6: corrosion prevention of a structure: the requirements of relevant anticorrosion construction processes are strictly executed, the anticorrosion process is complicated, and field technical guidance is required during operation so as to ensure reliable implementation of anticorrosion measures.
The preparation before construction comprises the following steps:
(1) raw floor and substrate treatment
And removing saline soil which is 30cm below the original surface. Rolling the embankment base after clearing the surface, performing super-digging, airing or watering wetting if necessary, uniformly stirring and then rolling, wherein the compaction quality of the embankment base after treatment is the same as the requirement of the corresponding part of the embankment, and a temporary roadbed drainage facility is made. And (3) filling and tamping pits in the roadbed range, and rolling to ensure that the compaction degree reaches 93%. When the original ground is steeper than 1:5, the steps are dug from bottom to top, the width of the steps is not less than 2m, the height of the steps is about 0.3m, and the steps are inclined inwards by 4% of slope, so that the stability of the filled roadbed is ensured.
(2) Construction lofting
Checking design drawings seriously, calculating the distance from each section slope foot point to a central line according to the design drawings, calculating the coordinates of piles and slope foot piles in each section according to curve parameter programming, using a total station to play control piles in a embankment filling area according to a coordinate method by using control points provided by design, and marking a pile number and a central filling height.
And secondly, construction setting-out is carried out on each filling layer, and filling layer center lines and filling sidelines are discharged. In order to ensure the compaction effect of the edge part of the filling layer, the filling layer is properly widened (each side is widened by 50cm) compared with the roadbed structure, and the slope is brushed according to the structure width after filling. And marking out filling side lines of the roadbed by lime, respectively arranging side piles 30cm outside the side lines of the two sides of the roadbed every 20m on the straight line section, and marking by red paint to determine a cross section. And (3) actually measuring the elevation of the rolled layer surface of each point according to a measuring point plane layout diagram, calculating the loose paving thickness, and starting a measuring and laying process before the static pressure surface collection process is finished for facilitating parallel operation after entering a formal operation cycle, wherein the measuring and laying process and the compaction detection process are simultaneously carried out.
(3) Cloth material
Firstly, non-saline soil or weak saline soil is hauled to be spread according to a selected stock ground, the fillers are layered according to the horizontal level under the command of a specially-assigned person after squares are drawn according to the stacking distance of the cloth, and the materials are unloaded from the lower part, the higher part, the two sides and the center. When the embankment is filled, longitudinal full-section horizontal layered filling is adopted according to a designed section, and the layered filling and the layer-by-layer compaction from the lowest position should not exceed 25 cm. The filling material is spread by a bulldozer or a loader, the filling material is uniformly spread on a preset width, the surface is required to be smooth, and soil blocks, particles with the size of more than 10cm and other impurities are removed during spreading.
(4) Spreading and leveling
And a height control line is set to control the loose paving thickness (not more than 30 cm), and the filler is roughly leveled by a bulldozer to ensure that the layer surface is level and uniform.
(5) Watering stuffy material
Uniformly sprinkling and sealing the filler by using qualified construction water to reach the optimal water content of + 1%;
(6) secondary levelling and compacting
After the roadbed filling is tight, a 26T road roller is adopted for stabilizing the pressure once, and then the roadbed is primarily leveled again by a grader. And then quickly performing static pressure once on the section just leveled by using a road roller, and then finely leveling once by using a land leveler. The rolling adopts a vibratory roller to stabilize the pressure firstly, then slowly and quickly, from weak vibration to strong vibration, and the rolling wheel traces of the vibratory roller are overlapped by 0.4-0.5m until no obvious wheel traces exist. And (3) rolling is carried out according to the principle of firstly lightening and then weighting, and firstly carrying out static pressure and then vibrating pressure, and 1/3 wheel width is overlapped during rolling.
(7) Compaction detection
And in the test section, rolling is carried out in a combined mode of 1-1-N-1, namely 1 time of static pressure (22 t roller), 1 time of weak vibration (22 t roller), N times of strong vibration (26 t roller) and 1 time of static pressure (22 t roller), and in order to determine the relation between the compaction degree and the rolling times, the compaction degree tracking detection is carried out every time the roller is rolled for 1 time. According to the compaction degree detection result, the compaction degree can reach more than 93% when the vibration compaction is carried out for 4 times, and the compaction requirement of a 92 area is met; the compaction degree can reach more than 95% when the vibration compaction is carried out for 5 times, and the compaction requirement of a 94 area is met.
(8) Construction of geotechnical partition layer
The project adopts a two-cloth one-film composite geomembrane (more than or equal to 360g per square meter), and has impermeability, corrosion resistance, ageing resistance, freezing resistance and certain strength. The road bed bottom is arranged to prevent moisture and salt from eroding the road bed layer and the pavement structure layer.
(9) Construction of anti-corrosion measures for structures
The structure surface painting material needs to be made of an insulating material, has good performances of waterproofness, fire resistance, ultraviolet resistance, ageing resistance, strong cohesive force, freezing resistance, acid and alkali resistance and the like, and can effectively avoid the physical and chemical damage of the structure.
In conclusion, by adopting the construction method, the highway subgrade is constructed in the middle, strong or over-saline soil areas, the geomembrane (cloth) partition layer needs to be laid, and the soil laying position is preferably arranged at the bottom of the roadbed, so that on one hand, moisture and salt entering the upper part of the subgrade are reduced, and salt expansion is effectively prevented; on the other hand, the water and salt are prevented from entering the pavement, so that the salinization of the pavement is prevented; the geomembrane (cloth) used as the partition layer should have impermeability, corrosion resistance, ageing resistance, freezing resistance and certain strength. And meanwhile, the roadbed filling material is filled by non-saline soil or weak saline soil.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The method for constructing the strong alkali saline soil subgrade in the cold and arid areas of the plateau is characterized by comprising the following steps
The method comprises the following steps:
s1, original ground processing: the removal of the saline soil and the saline soil on the surface layer of the roadbed base is enhanced, the removal thickness is strictly executed according to the designed thickness, and the depth can be locally increased so as to prevent the secondary salinization of the roadbed;
s2, roadbed filling water: performing a water quality analysis test before filling, and spraying fresh water when the roadbed is filled with non-saline soil; sprinkling brine when the roadbed is filled with weak saline soil, and sealing the roadbed to ensure that the water content of the roadbed filler is uniform and feasible;
s3, roadbed filling: before loading a roadbed, construction lofting is carried out, the center line and side line of the roadbed are lofted, a filler square grid is determined according to the specification of a transport vehicle, meanwhile, the elevation before filling is measured, the filler is paved and roughly leveled by a bulldozer, a grader is finely leveled, the filler is measured, the virtual pavement thickness is determined, and the filling thickness is ensured;
s4, laying an insulating layer: laying a partition layer at the bottom of the roadbed to prevent moisture and salt from entering the roadbed layer and avoid eroding the roadbed surface layer;
s5, compaction construction: rolling the roadbed by using a 26T vibratory roller;
s6, corrosion prevention of a structure: and (4) painting the surface of the structure by adopting an insulating material.
2. The method for constructing the soil subgrade of the strongly alkaline saline soil in the plateau cold arid region as claimed in claim 1, wherein the step S1 is removed to a thickness of 30cm, the pits within the range of the subgrade are filled and tamped once and rolled to a degree of compaction of more than 93%, when the original ground is steeper than 1:5, the steps are dug from bottom to top, the width of the steps is more than or equal to 2m, the height of the steps is 0.3m, and the steps are inclined inward by a slope of 4%, so that the stability of the filled subgrade is ensured.
3. The method for constructing the strong alkali saline soil subgrade in the plateau cold arid region as claimed in claim 1, wherein the construction layout in the step S3 comprises the following steps:
s31: preparing before lofting: carefully checking a design drawing, calculating the distance from each section slope foot point to a central line according to the design drawing, calculating the coordinates of a pile and a slope foot pile in each section according to curve parameter programming, using a control point provided by design, using a total station to discharge a control pile in a embankment filling area according to a coordinate method, and marking a pile number and a central filling height;
s32: construction lofting: constructing and setting out each filling layer, and releasing a filling layer center line and a filling sideline; in order to ensure the compaction effect of the edge part of the filling layer, the filling layer is properly widened than the roadbed structure, each edge is widened by 50cm, and after filling, a slope is brushed according to the structural width, wherein the slope brushing method comprises the steps of marking the filling side line of the roadbed by lime, respectively arranging a side pile 30cm outside the two side lines of the roadbed every 20m on the straight line section, and marking the side pile by red paint to determine the cross section.
4. The method for constructing the strong alkali saline soil roadbed in the plateau cold arid region as claimed in claim 3, wherein the filler in the S3 comprises the following steps:
s33: material distribution: spreading the non-saline soil or weak saline soil in selected stock ground by pulling and conveying the non-saline soil or weak saline soil according to the distribution
Stacking intervals, after square grids are drawn, the filler is layered horizontally, and is discharged from the lower part, the higher part, the two sides and the center; when the embankment is filled, longitudinal full-section horizontal layered filling is adopted according to a designed section, layered filling is started from the lowest position, and layer-by-layer compaction is carried out, wherein the compaction thickness is less than 25 cm;
s34: spreading and roughly flattening: a height control line is set to control the loose thickness which is less than or equal to 30cm,
the filler is roughly leveled by a bulldozer to ensure that the layer surface is smooth and uniform;
s35: sprinkling water and sealing materials: the qualified construction water is adopted to uniformly sprinkle and blank the filler,
the optimal water content is achieved to be +1 percent.
5. The method for constructing the alkaline saline soil subgrade in the plateau cold arid region as claimed in claim 1
Characterized in that the compaction construction in the step S5 comprises the following steps:
s51: secondary leveling and compacting: after the roadbed filling is stuffy, stabilizing the pressure once by using a road roller, immediately primarily leveling again by using a land leveler, rapidly and statically pressing once on a section which is just primarily leveled immediately by using the road roller, and finely leveling once by using the land leveler;
the rolling is performed by adopting a vibratory roller to stabilize the pressure firstly, then slowly and quickly, from weak vibration to strong vibration, the rolling wheel traces of the vibratory roller are overlapped by 0.4-0.5m until no obvious wheel traces exist, the rolling is performed according to the principle of firstly lightening and then weighting, firstly carrying out static pressure and then carrying out vibration pressure, and the rolling is performed by overlapping 1/3 wheel width;
s52: and (3) detecting the compactness: the test section adopts a 1-1-N-1 combination mode to carry out rolling, namely a 22t roller is adopted to carry out 1-time static pressure, a 22t roller is adopted to carry out 1-time weak vibration, a 26t roller is adopted to carry out N-time strong vibration and a 22t roller is adopted to carry out 1-time static pressure, in order to determine the relation between the compaction degree and the rolling times, the compaction degree tracking detection is carried out every 1 time of rolling, and the compaction degree can reach more than 93 percent when the roller is vibrated and compacted for 4 times according to the compaction degree detection result; the compaction degree can reach more than 95 percent when the vibration compaction is carried out for 5 times.
6. The method for constructing the alkaline saline soil subgrade in the plateau cold arid region as claimed in claim 1
Characterized in that in the step S4, the partition layer is a composite geomembrane with the density of more than or equal to 360g per square meter.
7. The method for constructing the alkaline saline soil subgrade in the plateau cold arid region as claimed in claim 1
Characterized in that the loose coefficient in the step S3 is 1.23.
8. The method as claimed in claim 5, wherein the method is applied to construction of the alkaline saline soil subgrade in the plateau cold arid region
The method is characterized in that in the step S51, every 100-150 m is used as a rolling operation surface, the edge of the roadbed is stabilized once before rolling, and the principle that the edge is firstly pressed to the middle, the light pressing is firstly performed to the middle, the heavy pressing is firstly performed to the middle, and the slow pressing is firstly performed to the fast pressing.
9. The method as claimed in claim 5, wherein the method is applied to construction of the alkaline saline soil subgrade in the plateau cold arid region
Characterized in that the step S52 tests: in order to prevent the transfer of salt and ensure the stability of the roadbed, the compactness of the roadbed is improved by 1-2%.
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| CN112593467A (en) * | 2020-12-03 | 2021-04-02 | 中交一公局集团有限公司 | Construction method for roadbed filling in arid region |
| CN113652914A (en) * | 2021-08-25 | 2021-11-16 | 新疆路桥建设集团有限公司 | Construction method and application of salinized soil roadbed |
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| JPH03260201A (en) * | 1990-03-09 | 1991-11-20 | Teruo Mori | Modifier for humid muddy roadbed |
| CN103628375A (en) * | 2012-08-24 | 2014-03-12 | 新疆交通建设（集团）有限责任公司 | Rock salt roadbed construction method |
| CN109137692A (en) * | 2017-06-13 | 2019-01-04 | 新疆北方建设集团有限公司 | A kind of gobi roadbed salt marsh chemical treatment construction |
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