CN111101413A - Device applied to salinized soil subgrade in seasonal frozen soil area and construction method - Google Patents
Device applied to salinized soil subgrade in seasonal frozen soil area and construction method Download PDFInfo
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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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- 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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Abstract
The invention discloses a device and a construction method applied to a salinized soil subgrade in a seasonal frozen soil area, belongs to the technical field of subgrade foundations, and aims to solve the problems that the salinized soil subgrade in the seasonal frozen soil area is easy to frost heaving, salt heaving and solution sink and the problem that a cushion layer is thick and is not easy to compact when the traditional subgrade gravel soil is used as a water-permeable partition layer. The device comprises an earthwork roadbed, a heat stabilizing facility and a partition facility, wherein the partition facility comprises a middle coarse sand lower protective layer, a modified desert sand partition layer and a middle coarse sand upper protective layer which are sequentially arranged from bottom to top; the heat-stabilizing facility comprises a bottom roadbed stabilizing facility and an upper layer heat-insulating facility, wherein the bottom roadbed stabilizing facility comprises an lime soil compaction pile and a lime soil cushion layer which are sequentially arranged from bottom to top. The method comprises the following steps of constructing a bottom roadbed stabilizing facility, constructing a partition facility, constructing an earthwork roadbed and an upper layer heat insulation facility, and constructing a peripheral water-stop wall. The invention can maintain the stability of water, heat and salt of the roadbed for a long time through the combination of the structure and the construction method; the cost is low, and the construction process is few, and it is simple to maintain.
Description
Technical Field
The invention belongs to the technical field of roadbed foundations, and particularly relates to a device and a construction method applied to a salinized soil roadbed in a seasonal frozen soil area.
Background
(1) The mechanism of saline soil subgrade settlement and salt expansion and frost heaving in the seasonal frozen soil area is as follows:
the cause of the saline soil can be summarized as follows: the method has the advantages that the method is arid in climate, rare in precipitation, strong in evaporation, and more salt is contained in the parent rock of the formed soil, the distribution of the parent rock is particularly wide in northwest provinces of China, the northwest provinces are mostly located in seasonal frozen soil regions, and the thickness of the movable layer is about 1.5-2.0 m; soil in the range of a salinized soil subgrade active layer in a seasonal frozen soil area is accompanied with various physical and chemical processes in the freezing and thawing cycle process, such as: water salt migration, salt phase change, energy transmission and the like; after the warm season is finished and the soil enters the cold season, the ground surface begins to freeze in the whole range of the movable layer, the freezing surface develops downwards, water moves from bottom to top towards the freezing surface, and simultaneously along with salt migration, when groundwater is active, the dissolving and moving effects on soluble salts such as sodium chloride, sodium sulfate and the like in the soil body are obvious, and the dissolving and moving diseases are easily induced; after the soil enters a warm season, the ground surface begins to melt, the frozen surface is transferred downwards, water moves towards the frozen surface from top to bottom, simultaneously, along with salt migration, in a seasonal frozen soil area, when the local temperature rises, the solubility of a salt solution is gradually improved, and precipitated crystals begin to melt; along with the alternate change of the air temperature of the seasonal frozen soil area, the roadbed soil undergoes repeated salt swelling, frost swelling and settlement processes, and soil body is repeatedly swelled and loosened to cause loose and swollen surface, unstable side slope or deformation and damage of highway roadbed and road surface; years of construction experience shows that the content of salts such as sulfate is higher, the loosening and swelling diseases are more serious, and the salt swelling and the solution collapse deformation of the soil body are irreversible.
In order to relieve and prevent the diseases of frost heaving, salt heaving and collapse of the salinized soil earthwork roadbed in the freezing region of the season, the effective way is to control the processes of water and salt migration, salt phase change, energy transmission and the like in the soil body.
(2) Measures for controlling water and salt migration in the prior art:
the traditional method for preventing and controlling the salt swelling and the sinking diseases of the salinized soil subgrade is to arrange a partition layer, wherein the partition layer is divided into an impermeable partition layer and a permeable partition layer. The traditional impervious partition layer is mainly made of geotextiles such as waterproof geotextile and waterproof boards, and the geotextiles such as waterproof geotextile are easy to be punctured by granular fillers under the action of external load, temperature load and the like in a construction rolling stage or an operation stage, so that the service life is influenced, and the like; the permeable partition layer is generally filled with gravel, aeolian sand, river sand or desert sand and the like with good permeability, and the basic principle of partition is that the thickness of the partition layer is larger than or equal to the rising height of capillary water containing salt, so that the partition effect is achieved.
But gravel or river sand is used as a water permeability partition layer, so as to play a role of partition, the paving thickness is larger, the capillary water of gravel soil and sand is increased to a height of between 40 and 110cm, more fillers are needed, and the method is suitable for road sections with the roadbed filling height of more than 1.8m and the fillers are available; the capillary water of the aeolian sand is increased to a strong height of 80-90cm, and when the aeolian sand is used as a water permeable partition layer, the laying thickness is at least 90cm, so that the problems that the compactness is difficult to control, the filler demand is large and the like exist; when the silty soil and the clay soil are used as water-permeable partition layers, the capillary water rises strongly to a height of 200-400cm, and if the silty soil and the clay soil contain more powder and clay particles, and thin film water exists between the powder and the clay particles, salt migration can occur along with the existence of the thin film water, secondary salinization is caused, and the partition layers gradually lose efficacy; therefore, the content of powder and clay should be strictly controlled during construction, which makes construction difficult.
(3) The current situation about roadbed thermal insulation and stability in the prior art:
in road engineering in permafrost regions or seasonal frozen soil regions, a heat preservation method is generally used in frost heaving prevention roadbed, and a heat preservation layer is laid in the roadbed, so that the variation range of a roadbed soil temperature field in an active layer range can be effectively reduced, and the positive effects of frost heaving prevention, water seepage prevention and thaw settlement prevention are achieved.
The existing heat insulation materials for the roadbed mainly comprise a Polyurethane (PU) plate, a polystyrene foam (EPS) plate, an extruded polystyrene foam plastic (XPS) plate and the like, the performance indexes of the heat insulation materials for the road engineering require that the thermal resistance, the strength and the rigidity need to reach certain standards, the thermal resistance rate and the compressive strength of the XPS plate are superior to those of the PU plate and the EPS plate, but the mechanical property of the XPS heat insulation plate material is greatly different from the roadbed filling, the thickness of the XPS heat insulation plate is in positive correlation with the heat insulation effect, but the excessive thickness of the XPS heat insulation plate can influence the overall rigidity of the roadbed, the problem that the deflection value exceeds the standard and the like can occur possibly, and the heat insulation plates such as the XPS and the like.
The application of the side slope heat preservation in road engineering of permafrost regions has proved that the side slope heat preservation can play a role in reaction, and when the side slope heat preservation material is applied in construction of seasonal frozen regions, the blocky heat preservation material is found to be easy to slide downwards, and bulge or slab staggering and local deformation are caused; the heat conductivity coefficients of the asphalt expanded perlite, the fine granular soil and the live turf soil are larger, and the heat insulation performance is poorer when the asphalt expanded perlite, the fine granular soil and the live turf soil are used as a slope heat insulation material.
The saline soil subgrade in the seasonal frozen soil region is required to solve the problem of the settlement caused by double reasons of frost heaving and salt heaving, the requirement of subgrade basement stability is considered in the basement treatment, and the soaking pre-dissolving method, the filling and replacing method, the dynamic compaction method, the compaction pile method and the like in the prior art are obviously limited.
The soaking pre-dissolving method is suitable for soil layers with small thickness and large permeability coefficient; the effect of treating the saline soil foundation by the dynamic compaction method is not ideal; the pile foundation construction process has various pile foundation types, in a saline soil area, soil body pore water is rich in salt solution, the specific gravity is high, the viscosity is high, the discharging is very difficult and slow, the drainage period is long, the construction period is long, and the compaction effect of the gravel pile is not ideal; chloride ions and sulfate which are rich in the saline soil have certain corrosion effect on metal materials and concrete, so that the driven steel sheet pile, the prefabricated square pile, the immersed tube cast-in-place pile, the CFG pile and the cast-in-place pile are not suitable for being applied to the treatment of the roadbed of the saline soil area.
Based on the problems in the background art, the technical personnel in the field research and develop a device and a construction method applied to the salinized soil subgrade in the seasonal frozen soil area in the construction of highway engineering with the thickness of the movable layer of the seasonal frozen soil area of more than northwest of 1.5m-2.0 m.
Disclosure of Invention
The invention aims to provide a device applied to a salinized soil subgrade in a seasonal frozen soil area, and aims to solve the problems that the salinized soil area and the subgrade in the salinized soil area are easy to frost heaving, salt heaving, sinking and the like.
The invention also aims to provide a construction method of the device applied to the salinized soil roadbed in the seasonal frozen soil area, so as to solve the problem that the cushion layer is thick and not easy to compact when the traditional roadbed gravel soil is used as a water-permeable partition layer.
In order to solve the problems, the technical scheme of the invention is as follows:
a device applied to a salinized soil subgrade in a seasonal frozen soil area comprises an earthwork subgrade, a heat-stabilizing facility and a partition facility, wherein the partition facility comprises a middle coarse sand lower protective layer, a modified desert sand partition layer and a middle coarse sand upper protective layer which are sequentially arranged from bottom to top; the heat-stabilizing facility comprises a bottom roadbed stabilizing facility and an upper heat-insulating facility, the bottom roadbed stabilizing facility comprises an ash soil compaction pile and a lime soil cushion layer which are sequentially arranged from bottom to top, the lime soil cushion layer is positioned below a middle coarse sand lower protective layer, and an earthwork roadbed and a road surface are sequentially paved above a middle coarse sand upper protective layer.
The system further comprises hydrothermal monitoring facilities, wherein the hydrothermal monitoring facilities are distributed in a group at intervals of 10-50 Km kilometers, each group of hydrothermal monitoring facilities is 1.5-2.5 m in length, and the hydrothermal monitoring facilities are laid in an upper protective layer of the earthwork roadbed and the medium coarse sand along the roadbed in a half width mode.
Furthermore, the horizontal arrangement interval of the hydrothermal probes is 1m, the vertical arrangement interval of the hydrothermal probes is 0.5m, one group of the hydrothermal probes is paved to a depth which exceeds the bottom end of the lime-soil compaction pile by 0.5m, and the rest groups of the hydrothermal probes are only paved in the earth roadbed and the upper protective layer of the medium coarse sand.
Furthermore, the hydrothermal monitoring facility comprises a thermistor cable and a hydrothermal probe which are connected with each other, the thermistor cable is connected with a monitoring device, the monitoring device comprises an information collector and a power supply device which are connected with each other, and the power supply device is connected with the thermistor cable.
Furthermore, modified desert sand water-proof walls are arranged on the outer sides of the lime-soil compaction piles.
Furthermore, the upper-layer heat-insulating facility comprises a bubble mixed light soil base layer and heat-insulating protective roads, wherein the bubble mixed light soil base layer is positioned above the earthwork roadbed and below the road surface, and the heat-insulating protective roads are positioned at two sides of the earthwork roadbed.
Furthermore, sand and soil surrounding areas with trapezoidal sections are arranged on two sides of the partition facility, and the sand and soil surrounding areas encapsulate the peripheries of the middle coarse sand lower protective layer, the modified desert sand partition layer and the middle coarse sand upper protective layer.
Furthermore, the lime-soil compaction pile is a quincuncial pile.
Furthermore, power supply unit includes solar battery and solar panel interconnect, connects through the dc-to-ac converter between solar battery and the solar panel.
A construction method of a device applied to a salinized soil subgrade in a seasonal frozen soil area is characterized by comprising the following steps: the method comprises the following steps:
step A, constructing a bottom roadbed stabilizing facility:
firstly, cleaning the surface by using an excavator, wherein the treatment depth is not less than 0.3m, and the humus soil is guaranteed to be excavated;
the pipe sinking method is adopted to form the lime-soil compaction pile, and the pile forming process comprises the following steps: the pile driver is put in place, the steel pipe is driven to the design requirement, the material is added, the pipe is pulled out, the pile is formed, the pile top is compacted, the heavy hammer is tamped and sealed, the base is fully compacted and leveled by a road roller and a leveler after the pile is formed, and the flatness meets the standard requirement;
adopting a marker post method to control the paving thickness, paving a 5% lime soil cushion layer with the thickness of 30-50cm, and layering and compacting;
after the pile is formed, a group of hydrothermal monitoring facilities are buried in a drilled hole, the lowest hydrothermal probe is ensured to be positioned at the position of 0.5m of the bottom end of the lime-soil compaction pile, and then the pile is fully compacted and leveled;
step B, partition facility construction:
filling sand soil edge-covered areas in a layered mode;
sequentially laying a middle coarse sand lower protective layer with the thickness of 5 cm;
a modified desert sand partition layer with the thickness of 3cm-5 cm;
a 5 cm-thick medium coarse sand upper protective layer, and embedding a hydrothermal monitoring facility with a corresponding depth when the layer is filled;
layering and primarily pressing, leveling and secondarily pressing, and finally rolling the surface layer;
step C, construction of an earthwork roadbed and an upper layer heat preservation facility:
filling an upper earthwork roadbed and a heat-insulating protective road of the partition facility in layers, constructing in full scale, and ensuring that the thickness of a road pavement is not more than 0.3 m; ensuring that the compactness meets the requirements of construction specifications after each layer of filling, and burying a hydrothermal monitoring facility with a corresponding depth during each layer of filling;
paving a bubble mixed light soil base layer, and curing for 7 days according to the standard;
d, constructing a peripheral water-stop wall:
building the modified desert sand water-proof wall, and fully compacting by adopting a rammer;
step E, pavement construction:
the standard requires the construction of a pavement.
The invention has the following beneficial effects:
(1) according to the invention, the partition facilities are arranged below the earthwork roadbed, and the modified desert sand is used as the impervious partition layer, so that the paving thickness is small, the compaction is easy, and the construction is convenient; its self has the characteristics of flexible selfreparing, belongs to flexible selfreparing impervious barrier, replaces traditional aeolian sand large thickness partition layer that permeates water, lays the data display of on-the-spot monitoring at the experimental section: the modified desert sand partition layer can directly partition capillary water, and soluble salts dissolved in the capillary water can be simultaneously partitioned, so that the water-resisting and salt-separating effects are remarkable, and the problems of settlement and secondary salinization are fundamentally solved.
(2) The heat-stabilizing facility comprises a bottom roadbed stabilizing facility and an upper-layer heat-insulating facility, wherein the upper-layer heat-insulating facility is arranged above and around the earthwork roadbed, and in a seasonal frozen soil area, the thickness of a movable layer is about 1.5-2.0 m in the northwest direction, so that the good heat-insulating facility can ensure that the movable layer is not completely frozen below the earthwork roadbed when the earthwork roadbed comes in severe winter, and the problems of frost heaving of the lower roadbed and wet sinking after salt heaving are fundamentally solved; the foam mixed light soil is selected as the heat insulation layer paved above the earthwork roadbed, and the foam mixed light soil is characterized in that the density is smaller than that of common concrete, the strength and the rigidity even exceed those of a soil body with good performance, the heat conductivity coefficient, the strength and the density can be adjusted, and the heat conductivity coefficient can be reduced by adjusting the density under the condition of meeting the requirements of the strength and the durability, so that the heat insulation performance is improved; the bubble mixed light soil has high porosity, small heat conductivity coefficient, good shock resistance, heat insulation and freeze-thaw resistance; after the bubble mixed light soil is mixed according to a certain mixing proportion, the fluidity, the water retention property and the workability are good, the construction is convenient, and the initial strength of curing for 7 days after solidification is high; the bubble mixed light soil belongs to cement stable granules, can be used for construction of a base layer subbase layer, has good shock resistance, heat insulation and freeze-thaw resistance, and meets the requirement of strength and rigidity.
And when the thickness of the slope heat-preservation protecting channel is larger than the thickness of the movable layer, the ground temperature of the roadbed outside the widening section is always at the normal temperature, the range of the movable layer outside the widening section can be reduced, the occurrence and development of frost heaving, salt heaving and thawing damage of the roadbed are controlled, and the problem of soil body bulking caused by salt phase change is avoided.
As the upper heat preservation facility of the seasonal frozen soil area, the combination of the bubble mixed light soil and the heat preservation guard way, the data monitored on the laying site in the test section are displayed as follows: good heat-stabilizing effect can be achieved; and confirming the data of the field detection of the test section in the construction.
A bottom layer roadbed stabilizing facility is laid below the middle coarse sand lower protective layer, the bottom layer roadbed stabilizing facility selects the combination of a lime soil compaction pile and a lime soil cushion layer, the combination is specially specific to the characteristics of saline soil in a seasonal frozen soil area, and various factors such as compaction effect, water consumption, heat supply and the like are considered, the lime soil compaction pile can react to consume water and release heat and expand in volume in construction, a quincunx pile group reacts with the lower foundation soil, water absorption, expansion and compaction are realized, the bearing capacity of the foundation can be remarkably improved, and a large amount of reaction heat is emitted, so that the bottom layer roadbed stabilizing facility has a positive effect on the thermal stability of the upper roadbed; the combined lime soil cushion layer can ensure that the excessive capillary water below the lime soil cushion layer can be absorbed in later use, and the application effect is good.
(3) The hydrothermal probe in the hydrothermal monitoring facility can timely detect the hydrothermal current situation of the earthwork roadbed and the corresponding position below the earthwork roadbed, and can collect data, so that the monitoring is convenient, the whole solar energy is adopted for power supply, and the hydrothermal monitoring facility is more suitable for the current situation of the salinized soil road section in the northwest seasonal frozen soil area; the paving mode adopts half-width road width, the half-width road width is generally arranged at one end of a negative slope in consideration of freezing depth, one group of the half-width road width is arranged at intervals of 10-50 Km kilometers, the half-width road width is flexibly adjusted according to the geological condition of a construction field road section, when the geological structure similarity of the construction field road section is higher, the arrangement interval is widened, and when the geological structure similarity of the construction field road section is low and the condition above a road surface is complex, the arrangement interval is shortened; the hydrothermal monitoring facility can monitor the hydrothermal condition inside the roadbed in real time, monitor abnormality in time and ensure long-term healthy operation of the roads in the salinized land area in the seasonal frozen area; and a module with a function of forecasting hydrothermal abnormal conditions can be additionally arranged according to the requirement, so that intelligent monitoring is realized.
(4) The method of the invention highlights that the middle coarse sand lower protective layer, the modified desert sand partition layer and the middle coarse sand upper protective layer are wrapped by using layered filling sand granule soil, and meanwhile, the lower protective layer, the modified desert sand partition layer and the middle coarse sand upper protective layer are paved and compacted in a layered manner, thus ensuring the stability of the middle coarse sand lower protective layer, the modified desert sand partition layer and the middle coarse sand upper; meanwhile, the earthwork roadbed and the heat-preservation guard way are integrally paved, so that the stability of the heat-preservation guard way is ensured, the integrated construction process is less, and the cost is low; and finally, constructing the modified desert sand water-stop wall, further preventing the migration of water and salt on two sides of the roadbed, and comprehensively ensuring the stability of the roadbed.
(5) According to the invention, by combining the structure and the construction method, the upward migration of underground capillary water and soluble salt can be effectively isolated, and the processes of salt phase change, energy transmission and the like can be effectively controlled; the effects of water absorption, heat supplement and expansion compaction on the lower substrate are achieved, and the long-term water, heat and salt stability of the roadbed soil is maintained; and timely monitoring the water and heat conditions of the roadbed; the related part materials are common geotechnical materials, so that the construction cost is low, the construction procedures are few, and the later maintenance is simple; the whole facility construction and the roadbed construction are carried out simultaneously, and the long-term healthy operation effect of the constructed highway is obvious.
Drawings
FIG. 1 is a schematic view of a device applied to a salinized soil subgrade in a seasonal frozen soil area;
fig. 2 is a top view of fig. 1.
The reference numbers are as follows: 1. mixing the bubbles with a light soil base layer; 2. insulating and protecting the road; 3. a lime soil cushion layer; 4. compacting the piles by using lime soil; 5. modifying a desert sand partition layer; 6. a protective layer is arranged on the medium coarse sand; 7. a middle coarse sand lower protective layer; 8. modifying the desert sand water-proof wall; 9. a sand soil edge covering area; 10. a thermistor cable; 11. a hydrothermal probe; 12. a monitoring device; 13. an information collector; 14. a power supply device; 15. a pavement; 16. an earthwork roadbed.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-2, the device applied to the salinized soil subgrade in the seasonal frozen soil area comprises an earthwork subgrade 16, a heat stabilizing facility, a partition facility and a hydrothermal monitoring facility.
Specifically, the method comprises the following steps: the partition facility comprises a middle coarse sand lower protective layer 7, a modified desert sand partition layer 5 and a middle coarse sand upper protective layer 6 which are arranged from bottom to top in sequence; and sand soil surrounding areas 9 with trapezoidal sections are arranged on two sides of the partition facility, and the sand soil surrounding areas 9 encapsulate the peripheries of the middle coarse sand lower protective layer 7, the modified desert sand partition layer 5 and the middle coarse sand upper protective layer 6.
The heat-stabilizing facility comprises a bottom roadbed stabilizing facility and an upper layer heat-insulating facility:
the bottom roadbed stabilizing facility comprises an ash soil compaction pile 4 and a lime soil cushion layer 3 which are sequentially arranged from bottom to top, the lime soil cushion layer 3 is positioned below a middle coarse sand lower protective layer 7, and an earthwork roadbed 16 and a road surface 15 are sequentially paved above a middle coarse sand upper protective layer 6; the lime-soil compaction pile 4 is a quincuncial pile; and modified desert sand water-proof walls 8 are arranged on the outer sides of the lime soil compaction piles 4.
The upper-layer heat preservation facility comprises a bubble mixed light soil base layer 1 and a heat preservation guard way 2, the bubble mixed light soil base layer 1 is located above the earthwork roadbed 16 and below the road surface 15, and the heat preservation guard way 2 is located on two sides of the earthwork roadbed 16.
The hydrothermal monitoring facility comprises a thermistor cable 10 and a hydrothermal probe 11 which are connected with each other, the thermistor cable 10 is connected with a monitoring device 12, the monitoring device 12 comprises an information collector 13 and a power supply device 14 which are connected with each other, and the power supply device 14 is connected with the thermistor cable 10; the power supply device 14 includes a solar battery and a solar panel connected to each other, and the solar battery and the solar panel are connected through an inverter.
The hydrothermal monitoring facilities are arranged in a group at intervals of 10-50 Km, the length of each group of hydrothermal monitoring facilities is 1.5-2.5 m, and the hydrothermal monitoring facilities are laid in an earth roadbed 16 and a medium grit upper protective layer 6 along the roadbed in a half-width mode; the horizontal arrangement interval of the hydrothermal probes 11 is 1m, the vertical arrangement interval of the hydrothermal probes 11 is 0.5m, one group of the hydrothermal probes 11 is paved with a depth which exceeds the bottom end of the lime-soil compaction pile 4 by 0.5m, and the rest groups of the hydrothermal probes 11 are only paved in the earth roadbed 16 and the upper coarse sand protective layer 6.
The construction method of the device applied to the salinized soil subgrade in the seasonal frozen soil area comprises the following steps:
step A, constructing a bottom roadbed stabilizing facility:
firstly, cleaning the surface by using an excavator, wherein the treatment depth is determined according to the geological conditions of the construction site, so that humus is removed, and the treatment depth is not less than 0.3m in the construction;
the lime-soil compaction piles 4 are formed by a pipe sinking method, the lime-soil compaction piles 4 are arranged into quincuncial piles, and the pile forming process comprises the following steps: the pile driver is put in place, the steel pipe is driven to the design requirement, the material is added, the pipe is pulled out, the pile is formed, the pile top is compacted, the heavy hammer is tamped and sealed, the base is fully compacted and leveled by a road roller and a leveler after the pile is formed, and the flatness meets the standard requirement;
the paving thickness is controlled by adopting a marker post method, a 5% lime soil cushion layer 3 is paved, and the lime soil cushion layer is compacted in a layered mode, wherein the paving thickness is determined according to geological conditions of a construction site, and is generally 30cm-50 cm;
after the pile is formed, a group of hydrothermal monitoring facilities are buried in a drilled hole, the lowest hydrothermal probe is ensured to be positioned at the position of 0.5m at the bottom end of the lime-soil compaction pile 4, and then the complete compaction and leveling are carried out;
step B, partition facility construction:
filling a sand soil edge-covered area 6 in a layered manner;
sequentially laying a middle coarse sand lower protective layer 7 with the thickness of 5 cm;
a modified desert sand partition layer 5 with the thickness of 3cm-5 cm;
a 5 cm-thick medium coarse sand upper protective layer 6, wherein a hydrothermal monitoring facility with a corresponding depth is buried when the layer is filled;
the thickness of the modified desert sand partition layer 5 is determined according to geological conditions of a construction site, when the contents of underground capillary water and salt are high, the paving thickness of the modified desert sand partition layer 5 is properly increased, otherwise, the paving thickness is up to 3cm, so that partition can be realized, and the construction cost is lower;
layering and primarily pressing, leveling and secondarily pressing, and finally rolling the surface layer;
step C, construction of an earthwork roadbed and an upper layer heat preservation facility:
filling an upper earthwork roadbed 16 and a heat-insulating protective road 2 of the partition facility in layers, constructing in full scale, and ensuring that the thickness of a ripping layer is not more than 0.3 m; ensuring that the compactness meets the requirements of construction specifications after each layer of filling, and burying a hydrothermal monitoring facility with a corresponding depth during each layer of filling;
paving a bubble mixed light soil base layer 1, and curing for 7 days according to the standard;
d, constructing a peripheral water-stop wall:
building a modified desert sand water-stop wall 8, and fully compacting by adopting a tamper;
step E, pavement construction:
standards require the pavement 15 to be constructed.
Claims (10)
1. The utility model provides a be applied to device of seasonal frozen soil district salt soil road bed, includes earthwork road bed (16), its characterized in that: the sand-based sand separation system further comprises a heat-stabilizing facility and a partition facility, wherein the partition facility comprises a middle coarse sand lower protective layer (7), a modified desert sand partition layer (5) and a middle coarse sand upper protective layer (6) which are sequentially arranged from bottom to top; heat-stabilizing facility includes bottom road bed stabilizing facilities and upper heat preservation facility, bottom road bed stabilizing facilities includes lime-soil compaction stake (4) and lime-soil bed course (3) that set gradually from bottom to top, lime-soil bed course (3) are located protective layer (7) below under the medium coarse sand, earthwork road bed (16) and road surface (15) are laid in proper order to medium coarse sand upper protective layer (6) top.
2. The device of claim 1, applied to a salinized soil subgrade in a seasonal frozen soil area, wherein: the system also comprises hydrothermal monitoring facilities, wherein the hydrothermal monitoring facilities are arranged in a group at intervals of 10-50 Km kilometers, the length of each group of hydrothermal monitoring facilities is 1.5-2.5 m, and the hydrothermal monitoring facilities are laid in the earth roadbed (16) and the medium coarse sand upper protective layer (6) along the roadbed in a half-width mode.
3. The device of claim 2, applied to a salinized soil subgrade in a seasonal frozen soil area, wherein: the horizontal arrangement distance of the hydrothermal probes (11) is 1m, the vertical arrangement distance of the hydrothermal probes (11) is 0.5m, one group of the hydrothermal probes (11) is paved with a depth exceeding the bottom end of the lime-soil compaction pile (4) by 0.5m, and the rest groups of hydrothermal probes (11) are only paved in the earthwork roadbed (16) and the upper protective layer (6) of medium and coarse sand.
4. A device for application to a salinized soil subgrade in seasonal frozen soil areas according to claim 2 or 3, wherein: the hydrothermal monitoring facility comprises a thermistor cable (10) and a hydrothermal probe (11) which are connected with each other, the thermistor cable (10) is connected with a monitoring device (12), the monitoring device (12) comprises an information collector (13) and a power supply device (14) which are connected with each other, and the power supply device (14) is connected with the thermistor cable (10).
5. The device of claim 1, applied to a salinized soil subgrade in a seasonal frozen soil area, wherein: and modified desert sand water-stop walls (8) are arranged on the outer sides of the lime soil compaction piles (4).
6. The device of claim 1, applied to a salinized soil subgrade in a seasonal frozen soil area, wherein: the upper heat preservation facility comprises a bubble mixed light soil base layer (1) and a heat preservation guardrail (2), the bubble mixed light soil base layer (1) is located above an earthwork roadbed (16) and below a pavement (15), and the heat preservation guardrail (2) is located on two sides of the earthwork roadbed (16).
7. The device of claim 1, applied to a salinized soil subgrade in a seasonal frozen soil area, wherein: and sand and soil surrounding areas (9) with trapezoidal sections are arranged on two sides of the partition facility, and the sand and soil surrounding areas (9) encapsulate the peripheries of the middle coarse sand lower protective layer (7), the modified desert sand partition layer (5) and the middle coarse sand upper protective layer (6) therein.
8. The device of claim 1, applied to a salinized soil subgrade in a seasonal frozen soil area, wherein: the lime-soil compaction piles (4) adopt quincuncial piles.
9. The device of claim 4, wherein the device is applied to a salinized soil subgrade in a seasonal frozen soil area, and comprises: the power supply device (14) comprises a solar storage battery and a solar panel which are connected with each other, and the solar storage battery and the solar panel are connected through an inverter.
10. A construction method of a device applied to a salinized soil subgrade in a seasonal frozen soil area is characterized by comprising the following steps: the method comprises the following steps:
step A, constructing a bottom roadbed stabilizing facility:
firstly, cleaning the surface by using an excavator, wherein the treatment depth is not less than 0.3m, and the humus soil is guaranteed to be excavated;
the pipe sinking method is adopted to form the lime-soil compaction pile 4, and the pile forming process comprises the following steps: the pile driver is put in place, the steel pipe is driven to the design requirement, the material is added, the pipe is pulled out, the pile is formed, the pile top is compacted, the heavy hammer is tamped and sealed, the base is fully compacted and leveled by a road roller and a leveler after the pile is formed, and the flatness meets the standard requirement;
the paving thickness is controlled by adopting a marker post method, a 5 percent lime soil cushion layer 3 with the thickness of 30-50cm is paved, and the layers are compacted;
after the pile is formed, a group of hydrothermal monitoring facilities are buried in a drilled hole, the lowest hydrothermal probe is ensured to be positioned at the position of 0.5m at the bottom end of the lime-soil compaction pile (4), and then the pile is fully compacted and leveled;
step B, partition facility construction:
filling sand and soil surrounding areas (6) in a layered manner;
sequentially paving middle coarse sand lower protective layers (7) with the thickness of 5 cm;
a modified desert sand partition layer (5) with the thickness of 3cm-5 cm;
a middle coarse sand upper protective layer (6) with the thickness of 5cm, and a hydrothermal monitoring facility with the corresponding depth is buried when the layer is filled;
layering and primarily pressing, leveling and secondarily pressing, and finally rolling the surface layer;
step C, construction of an earthwork roadbed and an upper layer heat preservation facility:
filling an upper earthwork roadbed (16) and a heat-insulating protective road (2) of the partition facility in layers, constructing in full scale, and ensuring that the thickness of the road pavement is not more than 0.3 m; ensuring that the compactness meets the requirements of construction specifications after each layer of filling, and burying a hydrothermal monitoring facility with a corresponding depth during each layer of filling;
paving a bubble mixed light soil base layer (1), and curing for 7 days according to the standard;
d, constructing a peripheral water-stop wall:
building a modified desert sand water-stop wall (8), and fully compacting by adopting a tamper;
step E, pavement construction:
the standard requires the construction of a pavement.
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