CN109281234A - A kind of scoria railway bed and its construction method - Google Patents

Abstract

The invention discloses a kind of scoria railway bed and its construction methods.This kind of railway bed, including bedding, bedding embankment below (2), embankment (2) are located on ground (1)；Wherein, bedding, which by scoria mixes the mixed fillers that fine granules obtain and fills, is constituted, and the embankment (2) is filled by scoria filler to be constituted, and there are also drainings filtering layer (4) between bedding and embankment (2)；And slope protection construction (5) is equipped in the side slope of roadbed.The roadbed is suitable for the widely distributed area of scoria, under the premise of guaranteeing roadbed safety, scoria is utilized to greatest extent, purchase and the transportation cost of filler is greatly decreased, significantly reduce the project cost of railway bed, meanwhile also reduce and avoid dig pit generation scoria digging soil and the problem of influence environment.

Description

A kind of scoria railway bed and its construction method

Technical field

The present invention relates to a kind of railway bed and its construction methods.

Background technique

Roadbed as infrastructure under line important in railway engineering, should have it is firm it is durable, the characteristics such as be unlikely to deform, with The long-term ride comfort of track structure is kept, guarantees the operation of train safety and steady.

The graded broken stone that existing railway bed mostly uses good mechanical performance, meets code requirement, A group gravelly soil and gravel Stone soil, B group gravelly soil and sandy soil, C chunking stone soil, gravelly soil, gravelly soil and sandy soil, four class high quality fillers fill. It is still filling roadbed using graded broken stone or A, B, C group high quality filler in the widely distributed area of scoria for lacking high quality filler, it will It will increase project cost, and excavation spoir cannot be efficiently used, bring environmental problem.

Summary of the invention

First invention purpose of the invention is to provide a kind of scoria railway bed, which is suitable for scoria and divides extensively Cloth area, can be substantially reduced the cost of building of railway, and the influence to environment is small.

The present invention realizes its first invention purpose the technical scheme adopted is that a kind of scoria railway bed, including base Bed, bedding embankment below, embankment is located on ground, it is characterized in that: the bedding is mixed by scoria and obtained with fine granules Composite soil filler fills composition, and the embankment is filled by scoria filler and constituted, and there are also draining filters between bedding and embankment Layer；And it is constructed in the side slope of roadbed equipped with slope protection.

Second goal of the invention of the invention is to provide a kind of construction method of above-mentioned scoria railway bed, uses this method Construct can be substantially reduced railway build cost, be suitable for the widely distributed area of scoria.

The present invention realizes its second goal of the invention the technical scheme adopted is that a kind of scoria described in claim 1 The construction method of railway bed, the steps include:

A, the processing of ground

Rammed subgrade makes the buckling safety factor of ground not less than 1.25；

B, embankment fills

Fill forming embankment using scoria filler on ground, the clearance rate n of embankment_j≤ 32%, coefficient of subgrade reaction K₃₀≥90MPa/m；

C, the laying of filtering layer is drained

Sand gravel layer, non-woven geotextile and medium-sand seam, which are successively laid with, in embankment forms draining filtering layer；

D, bedding fills

The scoria mixed fillers obtained with fine granules are mixed using scoria on embankment to be filled, and bedding is formed；Base Bed is divided into the bottom layer of subgrade of lower part and the surface layer of subgrade bed on top；Thickness=1.9m, the clearance rate n of bottom layer of subgrade_j≤ 30%, ground COEFFICIENT K₃₀≥110MPa/m；Thickness=0.6m, clearance rate nj≤28%, the ground coefficient K30 >=150MPa/m of surface layer of subgrade bed；

E, the building of slope protection construction

Bedding, draining filtering layer, embankment constitute roadbed main body, the two sides of roadbed main body are alternate, lateral embedded concrete row Sink pours the concrete water blocking flange of arch between adjacent row sink stepwise, forms arched concrete skeleton slope protection pattern Slope protection construction；It constructs to form scoria railway bed.

Compared with prior art, the beneficial effects of the present invention are:

One, scoria is that the magma rich in gas is sprayed by volcanic vent, is hit after being rapidly condensed into solid-state in the sky The features such as broken gravel of lava made of the fragmentation of ground has face shaping irregular, internal more cellular porosities.Compared to general gravel Stone type fillers, engineering mechanics property is poor, and granule strength is lower, surface is easily broken, is not easy to be compacted, porosity is big and K30 is relatively low； It is not used as the build filler of railway bed.Embankment of the invention uses scoria filler, clearance rate n_j≤ 32%, coefficient of subgrade reaction K₃₀ ≥90MPa/m；Under the premise of using scoria to greatest extent, and it can be fully achieved and require relatively low embankment Engineering mechanics requirement.To the relatively high bedding of mechanical property, the composite soil filler with fine granules is mixed by multi-level recognition and is filled out It builds, scoria is used as the skeleton in filler, fine grained soil enhances its compaction capacity；Under the premise of meeting bedding mechanical property, Realize the reasonable utilization of scoria.And increase the isolation filtering layer of paving under bedding, it can effectively prevent hanging down for fine grained soil in bedding To loss, the double-deck slope protection construction effectively prevents lateral loss of the fine grained soil under rainwater effect again, so that roadbed Compactness is kept for a long time；And then it ensure that the long-term secured, reliable of roadbed, it is ensured that the safety of train operation.

In short, scoria is utilized under the premise of guaranteeing roadbed safety by the above measure in the present invention to greatest extent Come the roadbed that constructs a railway.The area widely distributed suitable for volcanic slag, can gather materials on the spot, and the purchase and fortune of filler is greatly decreased Defeated cost, hence it is evident that reduce the project cost of railway bed, meanwhile, also reduce and avoid dig pit generation scoria digging soil and The problem of influencing environment.

Further, scoria filler used in the step B of the method for the present invention is by maximum particle diameter d_maxIt is≤100mm, uneven Coefficient C_U>=6, Los Angeles rate of wear A_ALL≤ 50% scoria composition；

Further, the bedding in the step D of the method for the present invention is that the bottom layer of subgrade of lower part and the surface layer of subgrade bed on top are constituted；

The scoria mixed fillers that the bottom layer of subgrade uses when filling mix 1 part of volume by the scoria of 3 parts of volumes Fine granules composition；And its maximum particle diameter d_max≤ 75mm, nonuniformity coefficient C_U>=10, Los Angeles rate of wear A_ALL≤ 50%；

The scoria mixed fillers that the surface layer of subgrade bed uses when filling mix 1 part of volume by the scoria of 2 parts of volumes Fine granules composition；And its maximum particle diameter d_max≤ 60mm, nonuniformity coefficient C_U>=15,1≤coefficient of curvature C_C≤ 3, Los Angeles is worn away Rate A_ALL≤ 50%；

The fine granules are the fine grained soil of gravelly sand, coarse sand, middle sand or liquid limit less than 40%.

Both composite soil fillers of multi-level recognition, and hierarchical control filler norm controlling, can either utilize to greatest extent Volcanic slag, and can guarantee that the mechanical property of the bedding of build is met the requirements.

The present invention is described in further detail with reference to the accompanying drawings and detailed description.

Detailed description of the invention

Fig. 1 is the cross-sectional configuration schematic diagram of scoria railway bed of the invention.

Fig. 2 is the enlarged drawing of the local A of Fig. 1.

Fig. 3 is the side B of Fig. 1 to enlarged structure schematic diagram.

Specific embodiment

Embodiment

Fig. 1-3 is shown, and a kind of specific embodiment of the invention is a kind of scoria railway bed, including bedding, bedding Embankment 2 below, embankment 2 is located on ground 1, it is characterized in that: the bedding is mixed the mixing that fine granules obtain by scoria Filler fills composition, and the embankment 2 is filled by scoria filler to be constituted, and there are also draining filtering layers 4 between bedding and embankment 2； And slope protection construction 5 is equipped in the side slope of roadbed.

The construction method of the scoria railway bed of this example, the steps include:

A, the processing of ground

Rammed subgrade 1 makes the buckling safety factor of ground 1 not less than 1.25；

B, embankment fills

Fill forming embankment 2, the clearance rate n of embankment 2 using scoria filler on ground 1_j≤ 32%, base system Number K₃₀≥90MPa/m；

C, the laying of filtering layer is drained

Sand gravel layer 4a, non-woven geotextile 4b are successively laid in embankment 2 and medium-sand seam 4c forms draining filtering layer 4；

D, bedding fills

The scoria mixed fillers obtained with fine granules are mixed using scoria on embankment 2 to be filled, and bedding is formed；Base Bed is divided into the bottom layer of subgrade 3a of lower part and the surface layer of subgrade bed 3b on top；Thickness=1.9m, the clearance rate n of bottom layer of subgrade 3a_j≤ 30%, coefficient of subgrade reaction K₃₀≥110MPa/m；Thickness=0.6m, the clearance rate n of surface layer of subgrade bed 3b_j≤ 28%, coefficient of subgrade reaction K₃₀≥ 150MPa/m；

E, the building of slope protection construction

Bedding, draining filtering layer 4, embankment 2 constitute roadbed main body, the two sides of roadbed main body are alternate, lateral embedded concrete The concrete water blocking flange 5a of arch is poured between rhone 5b, adjacent row sink 5b stepwise, forms arched concrete skeleton shield The slope protection construction 5 of shelving formula；It constructs to form scoria railway bed.

Scoria filler used in above-mentioned steps B, by maximum particle diameter d_max≤ 100mm, nonuniformity coefficient C_U>=6, Lip river China fir Rock rate of wear A_ALL≤ 50% scoria composition；

Bedding in above-mentioned steps D is the bottom layer of subgrade 3a of lower part and the surface layer of subgrade bed 3b on top is constituted；

The scoria mixed fillers that the bottom layer of subgrade 3a is used when filling mix 1 part of body by the scoria of 3 parts of volumes Long-pending fine granules composition；And its maximum particle diameter d_max≤ 75mm, nonuniformity coefficient C_U>=10, Los Angeles rate of wear A_ALL≤ 50%；

The scoria mixed fillers that the surface layer of subgrade bed 3b is used when filling mix 1 part of volume by the scoria of 2 parts of volumes Fine granules composition；And its maximum particle diameter d_max≤ 60mm, nonuniformity coefficient C_U>=15,1≤coefficient of curvature C_C≤ 3, Los Angeles is ground Consumption rate A_ALL≤ 50%；

The fine granules are the fine grained soil of gravelly sand, coarse sand, middle sand or liquid limit less than 40%.

Claims (4)

1. a kind of scoria railway bed, including bedding, bedding embankment below (2), embankment (2) are located on ground (1), special Sign is: the bedding, which by scoria mixes the mixed fillers that fine granules obtain and fills, to be constituted, and the embankment (2) is by scoria Filler fills composition, and there are also drainings filtering layer (4) between bedding and embankment (2)；And slope protection structure is equipped in the side slope of roadbed Make (5).

2. a kind of construction method of scoria railway bed described in claim 1, the steps include:

A, the processing of ground

Rammed subgrade (1) makes the buckling safety factor of ground (1) not less than 1.25；

B, embankment fills

Fill being formed embankment (2) using scoria filler on ground (1), the clearance rate n of embankment (2)_j≤ 32%, ground COEFFICIENT K₃₀≥90MPa/m；

C, the laying of filtering layer is drained

Sand gravel layer (4a), non-woven geotextile (4b) and medium-sand seam (4c), which are successively laid with, in embankment (2) forms draining filtering layer (4)；

D, bedding fills

The scoria mixed fillers obtained with fine granules are mixed using scoria on embankment (2) to be filled, and bedding is formed；Bedding It is divided into the bottom layer of subgrade (3a) of lower part and the surface layer of subgrade bed (3b) on top；Thickness=1.9m, the clearance rate n of bottom layer of subgrade (3a)_j ≤ 30%, coefficient of subgrade reaction K₃₀≥110MPa/m；Thickness=0.6m, the clearance rate n of surface layer of subgrade bed (3b)_j≤ 28%, coefficient of subgrade reaction K₃₀≥150MPa/m；

E, the building of slope protection construction

Bedding, draining filtering layer (4), embankment (2) constitute roadbed main body, the two sides of roadbed main body are alternate, lateral embedded concrete Rhone (5b) pours the concrete water blocking flange (5a) of arch between adjacent row sink (5b) stepwise, forms arched concrete The slope protection of skeleton slope protection pattern constructs (5)；It constructs to form scoria railway bed.

3. the construction method of scoria railway bed as claimed in claim 2, it is characterized in that:

Scoria filler used in the step B, by maximum particle diameter d_max≤ 100mm, nonuniformity coefficient C_U>=6, Los Angeles is ground Consumption rate A_ALL≤ 50% scoria composition；

4. the construction method of scoria railway bed as claimed in claim 2, it is characterized in that:

Bedding in the step D is that the bottom layer of subgrade (3a) of lower part and the surface layer of subgrade bed (3b) on top are constituted；

The scoria mixed fillers that the bottom layer of subgrade (3a) uses when filling mix 1 part of volume by the scoria of 3 parts of volumes Fine granules composition；And its maximum particle diameter d_max≤ 75mm, nonuniformity coefficient C_U>=10, Los Angeles rate of wear A_ALL≤ 50%；

The scoria mixed fillers that the surface layer of subgrade bed (3b) uses when filling mix 1 part of volume by the scoria of 2 parts of volumes Fine granules composition；And its maximum particle diameter d_max≤ 60mm, nonuniformity coefficient C_U>=15,1≤coefficient of curvature C_C≤ 3, Los Angeles is worn away Rate A_ALL≤ 50%；

The fine granules are the fine grained soil of gravelly sand, coarse sand, middle sand or liquid limit less than 40%.