CN204212018U - A kind of road structure preventing and treating the soft soil roadbed freeze thawing disease of high and cold mountain area cheuch section - Google Patents

Abstract

The utility model relates to a kind of road structure preventing and treating the soft soil roadbed freeze thawing disease of high and cold mountain area cheuch section.Its architectural feature is equipped with Dense Broken Stone Peg at hard soil layer, compacting soil layer is filled with between Dense Broken Stone Peg, Dense Broken Stone Peg top is graded broken stone and sand composite cushion layer, graded broken stone and sand composite cushion layer top are that rubble changes packing course, rubble changes packing course surface and lays Cement Stabilized Sand Gravel and asphalt concrete pavement successively, sewer and gutter have been built in asphalt concrete pavement toe both sides, and bottom sewer, both sides parcel composite geo-membrane, composite geo-membrane is laid in both sides, gutter, the utility model not only significantly improves bearing capacity of foundation soil, reduce sedimentation, strengthen subgrade stability, and there is good cooling-down effect and water proof effect, the generation of the soft soil roadbed freeze thawing disease of high and cold mountain area cheuch section of this structural prevention and cure, ensure that high and cold mountain area is soft soil roadbed to run with security and stability.

Description

A kind of road structure preventing and treating the soft soil roadbed freeze thawing disease of high and cold mountain area cheuch section

Technical field

The utility model relates to a kind of road structure, specifically refers to a kind of road structure preventing and treating the soft soil roadbed freeze thawing disease of high and cold mountain area cheuch section.

Background technology

Weak soil refers to the fine grained soils that natural moisture content is high, natural void ratio is large, shear strength is low, compressibilty is high, generally be distributed in the area of the similar geological conditionss such as northern China rivers, seashore and lakeland loose sediment layer, and these areas are substantially in without freeze thawing impact or affect very faint region, in therefore conventional soft-soil foundation treatment method, do not need the impact considering Frozen-thawed cycled effect.In fact, mud, mucky soil, peat, cumulosol, dredger fill, miscellaneous fill and saturated aqueous cohesive soil etc. are referred to as weak soil by engineering, and these native fine particle contents are high, it is the soil body that heave susceptibility is very strong, very easily frost heave is there is, and in the thawing phase, by the thawing of a large amount of ice in the inner at freezing process, especially having under the condition enriching water recharging, cause the soil body to produce violent depression, thus serious harm is caused to engineering.

The highway construction experience of cold district and result of study show: in Frozen Area, especially dark Frozen Area, under the impact of subzero temperature in season in severe winter, and surface soil layer pore water glaciation on the one hand, volume expansion (coefficient of expansion is 9%); On the other hand, in cooling freezing process, the moisture in the non-frozen soil layer in bottom is continuously to the migration of freezing zone, top, gathering, and glaciation lens, occur significantly grand swollen, its total frost-heaving deformation amount change at 10 ~ 30cm not etc., even can more than 40cm.So large frost-heaving deformation, Hui Dui highway produces and destroys greatly, and this is also the main cause of Frozen Area highway engineering disease.There is frost heave after freezing poly-ice in roadbed in season in severe winter, road surface is uneven, and chaps, but vehicle still can run at a low speed.So in spring in next year in warm season, in the roadbed of top layer, ice crystal starts to melt, and native pore water freezes to discharge rapidly because of substrate, and foundation soil is softened, and bearing capacity reduces greatly, even completely loses.Under Traffic loading effect, produce phenomenon of rising soil, have a strong impact on urban and rural transportation.

Usually, most distinct issues that soft foundation is built highway are " stablizing " and " sedimentation ",

Soft soils in mountainous area is no exception, has the feature that Compression Settlement amount is large, discharging consolidation is slow, foundation stability is poor equally, and the general rich groundwater in weak soil area, mountain valley, and ground is excessively wet, draining is difficult.So, soft soil roadbed " unstability ", " depression " and " freeze injury " triple problem being simultaneously faced with weak soil of high and cold mountain area cheuch section.How to resolve this triple problem that high and cold mountain area cheuch section is soft soil roadbed, ensure the long-term stability of roadbed, guarantee the key scientific problems that highway safety operation just becomes urgently to be resolved hurrily.

China researcher sums up on basis at a large amount of deformation of soft soil study mechanism and engineering practice, proposes multiple soft-soil foundation treatment method.These treatment measures comprise: pass round, structural adjustment, excavate adverse soil mass, basement process.The object of basement process utilizes compacting, displacement, discharging consolidation, reinforcement and the method such as thermodynamics and composite foundation to reinforce foundation soil.But in soft foundation constructing highway process, few people consider " unstability ", " depression " and " freeze injury " triple problem of weak soil and relevant prophylactico-therapeutic measures simultaneously.Therefore, along with the deep propelling of development of the West Regions, the outstanding problem that triple problems of " unstability ", " depression " and " freeze injury " that high and cold mountain area cheuch section is soft soil roadbed are following western parts, west and south highway engineering construction faces, it relates in one aspect to soil stabilization technology, relates to again the research of the anti-freezing-thawing disaster engineering measure of roadbed simultaneously.Therefore urgent need correlative study and engineering solve these problems.

Summary of the invention

For triple problems of high and cold mountain area cheuch section soft soil roadbed " unstability ", " depression " and " freeze injury " that face, the utility model provides a kind of road structure preventing and treating the soft soil roadbed freeze thawing disease of high and cold mountain area cheuch section.This road structure utilize rubble to change method that packing course, graded broken stone and sand composite cushion layer Dense Broken Stone Peg, gutter, sewer and composite geo-membrane be combined effectively increase roadbed resistance to overturning, improve subgrade rating and reduce subgrade settlement, accelerate subgrade soils discharging consolidation, reduce the soft soil roadbed depth of frost penetration of high and cold mountain area cheuch section, cut off surface water to subgrade seepage flow, thus reduce depression and the frost-heaving deformation of roadbed.

The purpose of this utility model can be achieved through the following technical solutions:

Preventing and treating a road structure for the soft soil roadbed freeze thawing disease of high and cold mountain area cheuch section, is changed packing course, graded broken stone and sand composite cushion layer, Dense Broken Stone Peg, compacting soil layer, hard soil layer, sewer, gutter and composite geo-membrane formed by asphalt concrete pavement, Cement Stabilized Sand Gravel, rubble.Dense Broken Stone Peg is equipped with at hard soil layer, compacting soil layer is filled with between Dense Broken Stone Peg, Dense Broken Stone Peg top is rubble and sand composite cushion layer, rubble and sand composite cushion layer top are that rubble changes packing course, rubble changes packing course surface and lays Cement Stabilized Sand Gravel and asphalt concrete pavement successively, sewer and gutter have been built in asphalt concrete pavement toe both sides, and bottom sewer, both sides parcel composite geo-membrane, composite geo-membrane is laid in both sides, gutter, establish soakaway trench bottom sewer, sewer and gutter ponding drain in little mileage place culvert.

The beneficial effect of advantage of the present utility model and generation is:

1, owing to have employed, compressive strength is high, good cooling effect and the obvious rubble of discharging consolidation effect changes packing course, rubble and sand composite cushion layer and Dense Broken Stone Peg for the utility model, increase subgrade stability significantly, improve bearing capacity of foundation soil, reduce settlement of subgrade, reduce the depth of frost penetration of roadbed simultaneously, reduce frost-heaving deformation.Avoid because the reflection crack that larger distortion causes roadbed, road surface occurs vehicle loading, avoid the Frost Hazard of Road that Frozen-thawed cycled effect causes, ensure the safety and stability of road, for the operation and maintenance of high and cold mountain area cheuch Duan Ruanji highway saves a large amount of manpower and materials.

2, the utility model designing and arranging ditch and sewer, has discharged the surface water such as roadbed toe ponding, has prevented surface water to roadbed internal migration, reduces the possibility of roadbed frost damage distortion, ensure that the safety and stability of roadbed.

3, the main material used in the utility model is tunnel waste, along with building on a large scale of mountain highway, inevitably produces a large amount of tunnels waste, if these tunnel wastes arbitrarily abandon will cause a large amount of soil erosions and ecological disruption.Tunnel waste as road materials, is not only made material its use to the greatest extent by the utility model, and cost-saving, accomplishes recycling and the reasonably optimizing configuration of tunnel waste, reaches the coordinating and unifying of economic benefit, social benefit and environmental benefit.

4, the utility model structure is simple, and transport, construction are all very convenient, are conducive to extensively promoting the use of, have good application prospect.

Accompanying drawing explanation

Fig. 1 is the utility model horizontal section schematic diagram,

Fig. 2 is the direction earthwork grille schematic diagram laid in the graded broken stone of Fig. 1 and sand composite cushion layer medium sand.

Detailed description of the invention

As shown in Figure 1, preventing and treating a road structure for the soft soil roadbed freeze thawing disease of high and cold mountain area cheuch section, is change the thick graded broken stone of packing course 3,50cm by asphalt concrete pavement 1, Cement Stabilized Sand Gravel 2, rubble and sand composite cushion layer 4, Dense Broken Stone Peg 5, gutter 8, sewer 9 and composite geo-membrane 10 are formed.Be equipped with Dense Broken Stone Peg 5 at hard soil layer 7, stake footpath 0.8 ~ 1.2m, spacing is less than 3m.Compacting soil layer 6 is filled with, grinding compacting between Dense Broken Stone Peg 5.Dense Broken Stone Peg 5 top is graded broken stone and sand composite cushion layer 4, lays direction earthwork grille 11 in sand.Graded broken stone and sand composite cushion layer 4 top are laid rubble and are changed packing course 3, rubble back-filling in layers, compaction in layers, the thickness that rubble changes packing course 3 is 2m, rolls the degree of compaction to regulation and keeps the horizontal wall inscription gradient of regulation to guarantee that roadbed body interior moisture is along the gradient to external migration; Change packing course 3 surface at compacting rubble and lay Cement Stabilized Sand Gravel 2 and asphalt concrete pavement 1 successively, it is identical with road gradient that road aspect keeps rubble to change the packing course surface horizontal wall inscription gradient, rubble changes packing course 3 top and lays Cement Stabilized Sand Gravel 2 and asphalt concrete pavement 1 successively, sewer 8 and gutter 9 have been built in asphalt concrete pavement 1 roadbed toe both sides, and bottom sewer 8, both sides parcel composite geo-membrane 10, composite geo-membrane 10 is laid in both sides, gutter 9, establish soakaway trench bottom sewer 8, sewer 8 and gutter 9 ponding drain in little mileage place culvert.

This roadbed utilizes rubble to change packing course 3, graded broken stone and sand composite cushion layer 4 and the Dense Broken Stone Peg 5 under being placed in mattress layer makes soil strength be improved, improve bearing capacity of foundation soil, weakening to reach or control the differential settlement of roadbed, increase the object of resistance to overturning of weak soil, the reinforcing road bed effect of this road structure is mainly derived from following three kinds of effects: one is metathesis, and namely the former weak soil of ground is made foundation strength produce the effect increased by the macadam of higher-strength and the displacement of Dense Broken Stone Peg body; Two is crowd in-out effects, because of construction formation of pile in, the power of being squeezed of banketing between stake week and make soil around pile intensity produce increase effect; Three is accelerate drainage; sewer 8 and gutter 9 have been built in Cement Stabilized Sand Gravel 2 and asphalt concrete pavement 1 roadbed toe both sides; sewer and gutter ponding drain in little mileage place culvert; protection asphalt concrete pavement 1 is not by the erosion of water; extend the application life of roadbed, thus improve foundation capability.This roadbed first by excavate heave susceptibility weak soil, frost line is controlled to change in packing course 3 at the rubble of frost heave insensitivity, rubble is tunnel waste simultaneously, rubble is again the material of water stability and good water permeability, make the moisture occurring in freezing range remain on a lower number range, the possibility that frost heave and depression occur reduces; Secondly composite cushion layer is except guaranteeing that as regulating course the entirety of composite foundation is stressed, the two-layer direction earthwork grille 11 of its inside plays the effect regulating differential settlement by stretch-draw, simultaneously graded broken stone and sand composite bed is also double does water barrier, the passage that capillary water rises can be cut off, and the depth of frost penetration in winter can be reduced, reduce frost heaving amount; Dense Broken Stone Peg 5 has good water permeability, is beneficial to dissipation of excess pore-water pressure, thus reduces the possibility of frost heave further; Rockfill sewer 8 and gutter 9 is finally utilized contiguous to surface flow, surface pond, side slope rainwater and highway area affect the surface water discharge of subgrade stability, utilize simultaneously and be laid on bottom sewer and both sides, gutter, the composite geo-membrane 10 that is wrapped in sewer both sides ooze impact on bottom roadbed under preventing surface water, and then reduce the frost-heaving deformation of roadbed.So this roadbed is increasing the resistance to overturning of roadbed, is improving subgrade rating and while reducing subgrade settlement, prevent surface water to roadbed migration, prevent freeze injury, the unstability that prevention is soft soil roadbed, depression and freeze injury problem comprehensively.

Claims (1)

1. prevent and treat the road structure of the soft soil roadbed freeze thawing disease of high and cold mountain area cheuch section for one kind, by asphalt concrete pavement (1), Cement Stabilized Sand Gravel (2), rubble changes packing course (3), graded broken stone and sand composite cushion layer (4), Dense Broken Stone Peg (5), compacting soil layer (6), hard soil layer (7), sewer (8), gutter (9) and composite geo-membrane (10) are formed, it is characterized in that being equipped with Dense Broken Stone Peg (5) at hard soil layer (7), compacting soil layer (6) is filled with between Dense Broken Stone Peg (5), Dense Broken Stone Peg (5) top is graded broken stone and sand composite cushion layer (4), direction earthwork grille (11) is added in the middle of sand, graded broken stone and sand composite cushion layer (4) top are that rubble changes packing course (3), rubble changes packing course (3) surface and lays Cement Stabilized Sand Gravel (2) and asphalt concrete pavement (1) successively, sewer (8) and gutter (9) have been built in asphalt concrete pavement (1) toe both sides, and in sewer (8) bottom, both sides parcel composite geo-membrane (10), gutter (9) both sides are laid composite geo-membrane (10) sewer (8) bottom and are established soakaway trench, sewer (8) and gutter (9) ponding drain in culvert.