CN113652914A - Construction method and application of salinized soil roadbed - Google Patents
Construction method and application of salinized soil roadbed Download PDFInfo
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- CN113652914A CN113652914A CN202110980641.8A CN202110980641A CN113652914A CN 113652914 A CN113652914 A CN 113652914A CN 202110980641 A CN202110980641 A CN 202110980641A CN 113652914 A CN113652914 A CN 113652914A
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- 238000010276 construction Methods 0.000 title claims abstract description 79
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- 238000000034 method Methods 0.000 claims abstract description 37
- 238000005096 rolling process Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000011049 filling Methods 0.000 claims abstract description 31
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 16
- 239000011780 sodium chloride Substances 0.000 claims abstract description 16
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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
-
- 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
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a construction method and application of a saline soil roadbed, and relates to the technical field of construction of saline soil foundations. The construction method of the salinized soil roadbed comprises the following steps: excavating an alkali discharge channel foundation pit on at least one side of the roadbed, paving geotextile at the bottom of the alkali discharge channel foundation pit to serve as a water-resisting layer, filling gravel bound soil on two sides of the alkali discharge channel foundation pit, backfilling aeolian sand to the middle part of the alkali discharge channel foundation pit, and shaping and rolling after paving and leveling. This application is favorable to reducing the groundwater level of road bed along the line through excavating the alkali discharge canal, and gravel is bordured soil and long-pending husky and can effectively block capillary water and rise, guarantees the drying of roadbed to the specific backfill position of gravel is bordured soil and long-pending husky has guaranteed the intensity of road bed, and gravel is bordured soil and long-pending husky reserves are abundant in Xinjiang district, and the low price is easily used materials on the spot. The construction method has the advantages of simple process and operation, and has obvious effect when used for treating the salinized soil subgrade; the construction quality is easy to control, and the method can be widely applied to construction of salinized soil foundations.
Description
Technical Field
The invention relates to the technical field of construction of a saline soil subgrade, in particular to a construction method of a saline soil subgrade and application thereof.
Background
The salinized soil in China is widely distributed and divided into two large areas, namely a coastal salinized soil area and an inland salinized soil area according to geographical areas, the Xinjiang has arid climate, strong evaporation and closed terrain, and the special terrain and climate cause the accumulation of the salt in the regional soil to form an arid and over-dried salinized soil pressure area.
The highway subgrade in the saline soil area of the war group in Xinjiang is damaged by salt expansion, so that the subgrade pavement is expanded and cracked or turned into slurry, the shoulder slope of the road is loosened and peeled off, once the subgrade is immersed in water, the strength and the stability of the subgrade are rapidly reduced, slurry turning, salt expansion, corrosion and settlement deformation are generated, the service life of the highway is shortened, and the quality of the highway is difficult to guarantee. The total length of a second contract section of the first Shiwu-Aralar road project is 56.821Km, the regions of newly-built road sections at the end point along the section of the standard are farmlands and orchards which are not salinized, and other road sections mostly have salinization phenomena of old alkali discharge channel sections and the ground surface, are chlorine salinization, chlorite salinization and sulfite salinization, are mostly non-saline expansive soil, and have relatively high underground water level.
The existing construction method needs a large amount of earth changing and filling, needs a large amount of machinery in the construction process, and has high cost and long construction period.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a construction method of a salinized soil roadbed and application of the construction method of the salinized soil roadbed in treating the salinized soil roadbed.
The invention is realized by the following steps:
in a first aspect, the invention provides a construction method of a saline soil roadbed, which comprises the following steps: excavate in at least one side of road bed and arrange alkali canal foundation ditch, right it lays geotechnological cloth as the water barrier to arrange the bottom of alkali canal foundation ditch, right it bordures soil to arrange the gravel to fill in the both sides of alkali canal foundation ditch, to arrange the wind-laid sand of middle part backfill of alkali canal foundation ditch, the integer rolls after the flattening of paving.
In an optional embodiment, before excavating the foundation pit of the alkali discharge trench, measuring and lofting a roadbed;
preferably, the center line of the roadbed is firstly put out, one pile is arranged every 15-25m, then piles are tied on the two sides of the roadbed, the sidelines of each layer of gravel edge-covered soil and the aeolian sand filling are put out according to the surface height of the top of each layer of filling layer, the sidelines are controlled by bamboo poles, and a measuring flag is inserted on each pile every 15-25 m;
preferably, the alkali discharge channel foundation pit is lofted on at least one side of the roadbed according to a construction design drawing, the central axis, the top opening excavation line and the bottom opening position are lofted, and then excavation is carried out on the alkali discharge channel foundation pit.
In an alternative embodiment, multiple layers of gravel bound soil are filled in a grading way, the filling compaction thickness of each layer of gravel bound soil is 28-32cm, the loose paving coefficient is 1.1-1.2, and the loose paving thickness is 30.8-38.4 cm.
In an alternative embodiment, when the gravel bound soil is filled in multiple layers and times, the first layer is finished by one layer of paving, the gravel bound soil is firstly paved on two sides of the roadbed in each subsequent layer, and the aeolian sand is filled between the gravel bound soil on the two sides and is filled upwards layer by layer.
In an optional embodiment, after the aeolian sand is paved and leveled, cofferdams are arranged on the roadbed in a segmented mode, water begins to be discharged after the cofferdams are arranged, and rolling is started after the aeolian sand is fully infiltrated and the full thickness meets the requirement of the water content.
In an alternative embodiment, the length of the weir is greater than the height of not less than 30cm and the width of not less than 30 cm.
In an alternative embodiment, the rolling comprises using loader stabilization, vibratory roller static pressure, vibratory roller vibratory rolling and vibratory roller static pressure in sequence.
In an optional embodiment, the alkali discharge channel foundation pit is in an inverted trapezoid shape;
preferably, the length of the bottom edge of the alkali discharge channel foundation pit is 140-160 cm;
preferably, the height of the alkali discharge channel foundation pit is more than 2.5 m;
preferably, the length of the top groove of the alkali discharge channel foundation pit is the sum of the length of the bottom edge and 2.5 times of the height;
preferably, the slope rate of the side slope of the alkali discharge channel foundation pit is 1: 1.2-1.3.
In an optional embodiment, a first arc is arranged between the bottom edge of the alkali discharge channel foundation pit and the side slope, and the radius of the first arc is 95-105 cm;
preferably, two sides of the top groove of the foundation pit of the alkali discharge channel are provided with a retaining ramp, the retaining ramp and the side slope are arranged in a second arc shape, and the radius of the second arc shape is 115-125 cm;
in a second aspect, the present invention provides the use of a method of constructing a salinized soil substrate according to any one of the preceding embodiments for treating a salinized soil substrate.
The invention has the following beneficial effects:
according to the construction method of the salinized soil roadbed, the foundation pit of the alkali discharge channel is excavated, so that the underground water level of the roadbed along the line can be reduced, and the geotextile is laid at the bottom of the foundation pit of the alkali discharge channel in the roadbed construction process to serve as a waterproof layer, so that the saline-alkali diseases caused by the fact that the ground water enters a roadbed structure layer can be effectively isolated; meanwhile, gravel edge-covering soil is filled on two sides of the foundation pit of the alkali discharge channel, and wind-accumulated sand is filled in the middle of the foundation pit of the alkali discharge channel to form a partition layer, so that capillary water can be effectively blocked by the geotextile, the gravel edge-covering soil and the wind-accumulated sand, the drying of a roadbed is ensured, the strength of the roadbed is ensured by the specific filling positions of the geotextile, the gravel edge-covering soil and the wind-accumulated sand, the reserves of the gravel edge-covering soil and the wind-accumulated sand in Xinjiang area are rich, the price is low, and local materials are easy to obtain. The construction method of the salinized soil roadbed provided by the application is simple in process and operation, and has an obvious effect of treating the salinized soil roadbed; the construction quality is easy to control, the detection can be carried out by corresponding conventional detection means such as geotechnical tests, measurement observation and the like, and engineering technicians can easily master the method. The construction is quick, the organization is reasonable, and the method can be widely applied to the construction of the salinized soil roadbed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a process flow chart of a construction method of a salinized soil roadbed provided by the application;
FIG. 2 is a design diagram of an alkali discharge channel of the construction method of the salinized soil roadbed provided by the application;
fig. 3 is a field picture of cleaning the saline soil on the surface of the roadbed in the construction method of the saline soil roadbed provided by the application;
FIG. 4 is a field picture of the method for cleaning the field of the alkali-removing trench field for removing weeds and sludge in the construction method of the salinized soil roadbed provided by the application;
fig. 5 is a field picture of the alkali discharge channel being watered in the construction method of the salinized soil roadbed provided by the application;
fig. 6 is a field picture of cleaning the bottom of an alkali discharge channel in the construction method of the salinized soil roadbed provided by the application;
fig. 7 is a field picture of water sedimentation method construction of aeolian sand in the construction method of the salinized soil roadbed provided by the application;
fig. 8 is a field picture of top-bending bearing detection of the roadbed in the construction method of the salinized soil roadbed provided by the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The invention provides a construction method of a salinized soil roadbed, which comprises the following steps (please refer to figure 1):
and S1, performing measurement lofting on the roadbed.
Referring to fig. 3, the saline soil on the ground surface is removed, the center line of the roadbed is discharged, one pile is arranged every 15-25m (specifically, one pile is 20m in the embodiment), then piles are bolted on two sides of the roadbed, the sidelines of each gravel edge-covered soil layer and the wind-accumulated sand filling are discharged according to the height of the top of each filling layer, the sidelines are controlled by bamboo poles, one pile is arranged every 15-25m (specifically, one pile is 20m in the embodiment), and a measuring flag (including but not limited to a red triangular measuring flag) is inserted into each pile; the length of the bamboo pole is about 60cm generally, and red paint or white paint is coated on the bamboo pole at intervals of 30 cm.
And (3) lofting the foundation pit of the alkali removal channel on at least one side of the roadbed according to a construction design drawing, lofting the central axis, the top opening excavation line and the bottom opening position, excavating the foundation pit of the alkali removal channel, and performing construction once for rechecking.
And S2, excavating a foundation pit for the alkali discharge channel on at least one side of the roadbed.
Referring to fig. 4, the alkali discharge ditch site is cleaned to remove weeds and sludge, and then excavated. The foundation pit excavation of the alkali discharge canal adopts machinery as a main part, two excavators are arranged in a construction section according to the specific field condition of the standard section by manual cooperation, and the left side and the right side of each excavator are respectively provided with one excavator. And (4) paying attention to the soil condition during excavation, and abandoning earthwork meeting design requirements to the right slope protection way of the roadbed. And are stacked orderly so as to reduce the work load of slope brushing. The construction key points are as follows:
excavating according to the range shown by a channel excavation design drawing;
(1) the channel excavation is firstly carried out by using machinery, the soil body within 30cm of the designed elevation of the channel bottom can not be excavated by using machinery so as to avoid disturbing the undisturbed soil of the channel bottom, the part of the soil body needs to be manually cleaned, and the manual cleaning needs to be carried out strictly according to the designed section and elevation requirements.
(2) When the channels and the foundation pit are excavated, the backfill soil and the waste soil are separately stacked, so that the backfill soil and the waste soil cannot be mixed, and a soil stacking area has a certain position, so that traffic cannot be hindered and construction cannot be influenced.
(3) Over-digging and under-digging are strictly forbidden.
In the present application, please refer to fig. 2, the foundation pit of the alkali discharge channel is an inverted trapezoid; preferably, the length of the bottom side of the alkali discharge channel foundation pit is 140-160cm (specifically, the length of the bottom side can be selected to be 150cm in the embodiment); the height is more than 2.5 m; the length of the top slot is the sum of the length of the bottom edge and 2.5 times of the height; the slope ratio of the side slope is 1:1.2-1.3 (specifically, the slope ratio of the side slope can be selected to be 1:1.25 in the embodiment).
Preferably, the bottom edge of the alkali discharge channel foundation pit and the side slope are arranged in a first arc shape, and the radius of the first arc shape is 95-105cm (specifically, the radius of the first arc shape can be selected to be 100cm in the embodiment); two sides of the top groove of the alkali discharge channel foundation pit are provided with retaining ramps, the retaining ramps and the side slopes are arranged in a second arc shape, and the radius of the second arc shape is 115-125cm (specifically, the radius of the second arc shape can be selected to be 120cm in the embodiment); better transition in the alkali drain foundation pit has been realized through the arc setting in this application.
In this application, through at least one side excavation alkali discharge channel foundation ditch at the road bed, alkali discharge channel digs more than 2.5m deeply usually, can not only effectual reduction ground water level to below 2.5m, can also cut and hinder the farming and irritate the running water and collect the rainwater. When the highway in the saline land area is constructed, alkali discharge channels can be dug deeply on the two sides of the highway so as to reduce the underground water of the roadbed. Referring to fig. 5, the groundwater in the roadbed is lowered by using the water from the alkali discharge canal. Referring to fig. 6, the bottom of the alkali discharge channel is cleaned, so that gravel-filled edge-covered soil and wind-laid sand can be conveniently filled in the subsequent process.
And S3, laying geotextile at the bottom of the alkali discharge channel foundation pit as a waterproof layer, and filling gravel edge-covering soil at two sides.
The geotextile is laid at the bottom of the alkali discharge channel foundation pit to serve as a water-proof layer, so that the saline-alkali disease caused by the fact that water enters the foundation road structure layer on the ground can be effectively isolated.
The gravel bound soil is filled in multiple layers in a grading manner, the filling compaction thickness of each layer of gravel bound soil is 28-32cm (specifically, 30cm can be selected in the embodiment), the loose paving coefficient is 1.1-1.2 (specifically, 1.25cm can be selected in the embodiment), and the loose paving thickness is 30.8-38.4cm (specifically, 34.5cm can be selected in the embodiment). In the roadbed construction process, the loose paving thickness can be specifically adjusted to determine the optimal loose paving coefficient. And paving the gravel edge-covered soil by adopting a loader matched with a grader.
The gravel edge-covered soil is rolled by a vibratory roller, and is firstly statically rolled, then lightly vibrated and finally statically rolled and leveled.
And determining the rolling pass, the loose paving coefficient and the loose paving thickness of the gravel soil according to a method in the aeolian sand backfilling. And the method is used for controlling the subsequent construction engineering. (gravel soil compactness detection is measured by a sand filling method.)
When gravel edge-covered soil is filled in multiple layers in a grading way, the first layer is paved by one layer, and the gravel edge-covered soil is paved on two sides of the roadbed in each subsequent layer, namely, the second layer of gravel soil is paved and rolled after being leveled from one side, and the method is the same as the above. And (3) immediately performing the material preparation of the aeolian sand and the material preparation, the paving, the leveling, the rolling and other constructions of the edge-covered gravel soil on the other side while rolling.
And S4, backfilling aeolian sand to the middle part of the foundation pit of the alkali discharge channel, and paving and leveling.
Before the aeolian sand filling construction, representative aeolian sand is sampled and tested, and the maximum dry density of the aeolian sand in a dry vibration and water saturation state is determined. And (4) setting out a base center line and a side line according to the cross section. And (4) pushing the filler, and longitudinally filling and transporting the aeolian sand to a filling road section from two sides of the roadbed or a short distance by a bulldozer.
The thickness of the aeolian sand filled virtual pavement is controlled to be 30-40 cm. The control of the virtual pavement thickness adopts a line hanging mode, the control is about 33cm according to design requirements, the roadbed filling adopts full-width construction, the construction of the gravel soil with edges covered at the two sides of the roadbed is firstly carried out during the filling, then the filling of the aeolian sand in the middle road groove is carried out, after the construction of the gravel edge-covered soil is completed, an automatic unloading vehicle conveys the aeolian sand filler along an auxiliary road, and the aeolian sand filler is paved and leveled, and the full-width layered layer-by-layer upward filling is carried out according to the cross section.
The application selects a water drop rolling compaction process. The process is suitable for the road sections with sufficient water source and convenient water supply at the edges of deserts. After the aeolian sand is paved and leveled, cofferdams are arranged on the roadbed in a segmented mode, segments are properly divided according to the sizes of a longitudinal slope and a transverse slope when the cofferdams are arranged, the length is not less than 10m, and the width is not less than 5 m. The height of the length of the arranged cofferdam is not less than 30cm, and the width of the cofferdam is not less than 30 cm. And after the cofferdam is arranged, water drainage is started, and water irrigation is continuously carried out. Referring to fig. 7, after the aeolian sand is fully infiltrated and the total thickness reaches the requirement of water content, rolling is started.
The gravel edge-covered soil in the application can realize strengthening the strength of the foundation pit of the alkali discharge channel, and meanwhile, the geotechnical cloth, the gravel edge-covered soil and the aeolian sand are combined to form a partition layer, wherein the gravel edge-covered soil partition layer needs to ensure the thickness of 30 cm-40 cm, the gravel particle size is not larger than 5cm, the soil content of the particle size smaller than 0.5mm cannot be larger than 5%, the gravel partition layer can effectively block capillary water from rising, and the roadbed strength can be increased. The minimum thickness of the aeolian sand needs to be ensured to be 60cm, the maximum thickness of the aeolian sand is not more than 1m (the construction quality is difficult to ensure after the aeolian sand exceeds the minimum thickness), the content of powder sticky particles in the sand is less than 5%, and the two slopes of the aeolian sand are subjected to 30cm thick gravel soil edge covering (or clay edge covering). The aeolian sand roadbed can block capillary water and ensure the roadbed to be dry, and simultaneously can achieve higher strength, and aeolian sand is common in Xinjiang areas, abundant in reserve and low in price.
When the roadbed filling height is limited, the minimum height of the water-permeable partition layer can not be reached, a water-impermeable partition layer (composite geotextile) can be adopted, and the partition layer is arranged at a certain depth in the embankment to partition the upward migration water and salt, so that the salt expansion and slurry turning of the roadbed can be effectively prevented.
And S5, shaping and rolling.
1. Compacting machine selection
The combination of the compacting machine and the rolling mode are formulated as the following table 1:
TABLE 1 combination of compacting machines and compaction mode
The rolling process can be properly adjusted according to the compaction effect: the loader presses once for the first time, the grader presses once for the fine time, the road roller presses once for the static time, the grader presses for the second time for the fine time, the road roller strongly shakes and rolls (the times are determined according to the detection that the compaction degree of each time meets the requirement), and finally the road roller presses once for the static time.
When the land leveler shapes for about 100m, the road roller rolls immediately afterwards. And the materials are sequentially pushed forwards to form the flow process.
When rolling, the rolling is carried out according to the principle that the rolling is carried out from outside to inside, from low to high, firstly light and then heavy, and firstly static pressure, then vibration pressure and then static pressure. And 1/3 wheels are overlapped for wide rolling during rolling, the longitudinal overlapping of the front and the rear adjacent sections is not less than 2m, no pressure leakage and no dead angle are required to be achieved, and the uniform rolling is ensured.
Specifically, the requirements for the loader to stabilize (initial pressure) include: the loader is used for stabilizing the pressure once before the grader is finely leveled, and the tracks of the loader are overlapped 1/2 during the pressure stabilization, so that the tracks are fully distributed on the whole operation surface once. After the land leveler is finely leveled for one time, the land leveler is used for carrying out static pressure for one time and leaking potential unevenness, and the land leveler is finely leveled for the second time.
The requirements for vibratory compaction (re-compaction) of a vibratory roller include: (1) rolling by a 22T vibratory roller driven front and back, wherein the vibration frequency is 30-45Hz, the amplitude is 0.4-0.1mm, the rolling is performed slowly and quickly, and the vibration rolling is performed by strong vibration. (2) The rolling running speed of the road roller is controlled within 4km/h at the beginning, and the rolling is carried out in a longitudinal advancing and retreating mode from two sides to the middle. The front and the rear adjacent sections are longitudinally overlapped for more than 2m, so that no pressure leakage and dead angle are realized, and the uniform rolling is ensured. The overlapping width of the wheel tracks 1/3 is the wheel width during rolling, and the wheel tracks are distributed on one working surface for one time. In the rolling process, if bulge or hollow phenomenon occurs, constructors should be organized in time to level, and if slurry is turned over, filling is replaced in time to roll. (3) When the vibratory roller rolls, a tester performs compaction degree detection for each time, the compaction degree detection adopts a cutting ring method, and simultaneously fills the rolling times and a corresponding compaction degree statistical table, so as to collect the rolling times of each compaction degree standard. And stopping rolling when the compaction standard is reached.
The requirements for the final compaction of the roller include: and (3) carrying out rolling from outside to inside by adopting static pressure during final pressing, wherein the overlapping width of the wheel tracks is not less than the width of 1/2 single wheels during rolling, and the wheel tracks of the single wheels are fully distributed on a working surface for one time, so that the pressure is stabilized until no obvious wheel tracks exist.
The aeolian sand is used as a special roadbed filler, a test department performs sampling test on a filler material source before construction to obtain corresponding compaction standard parameters, and a common ring cutter method is adopted in the construction process to detect the roadbed compaction degree.
After the construction is completed, project technicians and testers can follow up the roadbed quality detection in time. Such as the top bend test shown in fig. 8.
The construction method of the saline soil subgrade can be widely applied to treatment of the saline soil subgrade, for example, construction of embankments of roads in most saline soil areas and areas with higher underground water level in Xinjiang.
The construction method of the salinized soil roadbed provided by the application is simple in process and operation, and has an obvious effect of treating the salinized soil roadbed; the construction quality is easy to control, the detection can be carried out by corresponding conventional detection means such as geotechnical tests, measurement observation and the like, and engineering technicians can easily master the method. The construction is quick, the organization is reasonable, and the method can be widely applied to the construction of the salinized soil roadbed.
The features and properties of the present invention are described in further detail below with reference to examples.
Application example 1
The full length of the project of the second contract section of the first Shiwu-Aralar road project is 56.8Km, the regions of newly-built road sections at the end point along the standard section are farmlands and orchards and are not salinized, other road sections mostly have salinization phenomena of old alkali discharge channel sections and the ground surface, are chlorine salinization, chlorite salinization and sulfite salinization, are mostly non-salt swelling soil, and the underground water level is relatively high. The length of a main line salinization and old alkali discharge channel treatment section of the standard section is 43.054Km, and the length of a fish pond section is 45 m.
In the project construction process, the original design replacement depth of the widening section at the right side of the main line roadbed is 1.5 meters, the width is 6 meters, and the total replacement and filling amount is as follows: 319410m3(ii) a After the underground water level is reduced by excavating the right side alkali discharge channel, the project construction replacement and filling depth is reduced to 1.2 meters and the width is 6 meters, and the actual replacement and filling amount is 255528m3(ii) a The earthwork is saved: 63882m3. Meanwhile, a large amount of mechanical cost for roadbed construction is reduced. And the construction period is shortened, and a foundation is laid for the project to be handed over on time. See table 2 for specific economic benefits.
The construction method of the salinized soil roadbed provided by the application is adopted to construct the road section, firstly, the alkali discharge channel on the right side of the roadbed is excavated, the excavation is deepened by widening the alkali discharge channel, the underground water level of the roadbed along the line is obviously reduced, and in the roadbed construction process, geotextile is laid at the bottom of the roadbed to serve as a waterproof layer, so that the condition that the saline-alkali diseases are caused by the fact that the ground water enters a roadbed structure layer can be effectively isolated; meanwhile, gravel edge-covering soil is filled on two sides of the foundation pit of the alkali discharge channel, and aeolian sand is filled in the middle of the foundation pit of the alkali discharge channel to form a partition layer. The roadbed filling and replacement excavation depth is reduced in the roadbed construction process, and the construction cost and the project construction period of a project are greatly saved. Meanwhile, project technicians and testers follow up the roadbed quality detection in time. And no roadbed settlement occurs after construction is finished.
TABLE 2 comparison of economic benefits
| Construction scheme | Original design | Example 1 | Spare time |
| Pile number changing and filling | K52+910-K88+400 | K52+910-K88+400 | |
| Filling width/m | 6 | 6 | |
| Filling depth/m | 1.5 | 1.2 | |
| Square/m3 | 319410 | 255528 | 63882 |
| Output/ten thousand yuan | 2746.9 | 2197.5 | 549.3 |
K52+910-K88+400 alkali discharge channels are excavated, great economic benefits are brought to farmlands with the circumference of 2 ten thousand mu, and great convenience is brought to the alkali discharge and precipitation of cotton lands on two sides.
In summary, the construction method of the saline soil roadbed provided by the application is beneficial to reducing the underground water level of the roadbed along the line by excavating the alkali discharge channel, and the geotextile is laid at the bottom of the foundation pit of the alkali discharge channel in the roadbed construction process to serve as a waterproof layer, so that the saline-alkali diseases caused by the fact that the ground water enters the roadbed structure layer can be effectively isolated; meanwhile, gravel edge-covering soil is filled on two sides of the foundation pit of the alkali discharge channel, and wind-accumulated sand is filled in the middle of the foundation pit of the alkali discharge channel to form a partition layer, so that capillary water can be effectively blocked by the geotextile, the gravel edge-covering soil and the wind-accumulated sand, the drying of a roadbed is ensured, the strength of the roadbed is ensured by the specific filling positions of the geotextile, the gravel edge-covering soil and the wind-accumulated sand, the reserves of the gravel edge-covering soil and the wind-accumulated sand in Xinjiang area are rich, the price is low, and local materials are easy to obtain. The construction method of the salinized soil roadbed provided by the application is simple in process and operation, and has an obvious effect of treating the salinized soil roadbed; the construction quality is easy to control, the detection can be carried out by corresponding conventional detection means such as geotechnical tests, measurement observation and the like, and engineering technicians can easily master the method. The construction is quick, the organization is reasonable, and the method can be widely applied to the construction of the salinized soil roadbed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A construction method of a salinized soil roadbed is characterized by comprising the following steps: excavate in at least one side of road bed and arrange alkali canal foundation ditch, right it lays geotechnological cloth as the water barrier to arrange the bottom of alkali canal foundation ditch, right it bordures soil to arrange the gravel to fill in the both sides of alkali canal foundation ditch, to arrange the wind-laid sand of middle part backfill of alkali canal foundation ditch, the integer rolls after the flattening of paving.
2. The construction method of the salinized soil roadbed according to claim 1, further comprising measuring and lofting the roadbed before excavating the base pit of the alkali discharge ditch;
preferably, the center line of the roadbed is firstly put out, one pile is arranged every 15-25m, then piles are tied on the two sides of the roadbed, the sidelines of each layer of gravel edge-covered soil and the aeolian sand filling are put out according to the surface height of the top of each layer of filling layer, the sidelines are controlled by bamboo poles, and a measuring flag is inserted on each pile every 15-25 m;
preferably, the alkali discharge channel foundation pit is lofted on at least one side of the roadbed according to a construction design drawing, the central axis, the top opening excavation line and the bottom opening position are lofted, and then excavation is carried out on the alkali discharge channel foundation pit.
3. The construction method of the salinized soil roadbed as claimed in claim 1, wherein the gravel bound soil is filled in multiple layers in a fractional manner, the filling compaction thickness of each layer of gravel bound soil is 28-32cm, the loose paving coefficient is 1.1-1.2, and the loose paving thickness is 30.8-38.4 cm.
4. The method for constructing a salinized soil roadbed as claimed in claim 3, wherein, when the gravel-covered soil is filled in multiple layers and times, the first layer is finished by one layer of paving, and each subsequent layer is firstly paved on two sides of the roadbed, and the aeolian sand is filled between the gravel-covered soil on two sides and is filled upwards layer by layer.
5. The construction method of the salinized soil roadbed as claimed in claim 4, wherein after the aeolian sand is spread and leveled, cofferdams are arranged on the roadbed in sections, water is discharged after the cofferdams are arranged, and after the aeolian sand is fully infiltrated and the full thickness reaches the requirement of water content, rolling is started.
6. The method for constructing the salinized soil roadbed as recited in claim 5, wherein the length of the cofferdam is larger than the height of not less than 30cm, and the width of the cofferdam is not less than 30 cm.
7. The method for constructing the saline soil subgrade according to the claim 5, wherein the rolling comprises the steps of stabilizing the pressure by a loader, stabilizing the pressure by a vibratory roller, vibrating and rolling by the vibratory roller and stabilizing the pressure by the vibratory roller in sequence.
8. The construction method of the salinized soil roadbed according to claim 1, wherein the alkali discharge channel foundation pit is in an inverted trapezoid shape;
preferably, the length of the bottom edge of the alkali discharge channel foundation pit is 140-160 cm;
preferably, the height of the alkali discharge channel foundation pit is more than 2.5 m;
preferably, the length of the top groove of the alkali discharge channel foundation pit is the sum of the length of the bottom edge and 2.5 times of the height;
preferably, the slope rate of the side slope of the alkali discharge channel foundation pit is 1: 1.2-1.3.
9. The construction method of the salinized soil roadbed as claimed in claim 1, wherein a first arc is arranged between the bottom edge of the alkali discharge channel foundation pit and the side slope, and the radius of the first arc is 95-105 cm;
preferably, two sides of the top groove of the alkali discharge channel foundation pit are provided with a retaining ramp, a second arc is arranged between the retaining ramp and the side slope, and the radius of the second arc is 115-125 cm.
10. Use of a method of constructing a salinized soil substrate as claimed in any one of claims 1 to 9 in the treatment of salinized soil substrates.
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Cited By (1)
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| CN114108407A (en) * | 2021-12-09 | 2022-03-01 | 中铁十局集团第七工程有限公司 | Construction method of strong-alkali saline soil subgrade in plateau cold and arid region |
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Application publication date: 20211116 |