CN109781962A - Based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method - Google Patents
Based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method Download PDFInfo
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Abstract
Based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method, scientifically and rationally to determine the design of high-speed railway Salty Soil Subgrade bedding insulating course, and implement convenient, clear process, Practical Project construction needs can be well adapted for.The following steps are included: determining that duration is no less than the temperature difference t of 1 year following different depth h in Salty Soil Subgrade top surface by live in-situ monitoring, and draw Δ t-h figure；Take in Δ t-h figure the corresponding depth of Δ t=[Δ T] as Salty Soil Subgrade environment temperature sensitivity layer depth ht；By the swollen test of salt marsh earth salt, the salt expansive force F of the following different depth h in roadbed top surface is determined, and draw F-h figure；Take in F-h figure the corresponding depth of F=W as salt expansive force critical balance depth hF；Determine that depth [h] is arranged in high-speed railway Coarse Saline embankment insulating course minimum；It is designed in conjunction with the structure of saline soil area Subgrade Bed of High-speed Railway, the final reasonable buried depth h for determining high-speed railway Salty Soil Subgrade insulating course.
Description
Technical field
The present invention relates to Geotechnical Engineering fields, in particular to the design side of high-speed railway Salty Soil Subgrade insulating course
Method.
Background technique
Salinized soil has the swollen and molten sunken characteristic of salt, and there is also the risks of frost heave, therefore build high-speed iron in saline soil area
Lu Shi, code requirement cannot cause saline soil area to build the filler of high-speed railway using salinized soil as roadbed filling at present
Problem is very prominent.
By scientific research, when controlling fine particle content and solvable salt content, Coarse Saline can be used for high speed
Subgrade Packing, but need to improve on road structure, the design of insulating course also needs to improve.Insulating course it is reasonable
Effect of depth is set to the migration path and mode of moisture and salinity within the scope of entire roadbed, and then it is high to influence saline soil area
Long-term salt-frost-heaving deformation of railway base and destruction.
" railway Special Subgrade Design specification " provides Salty Soil Subgrade filler soluble salt content at present, and to partition
The applicable elements of layer have carried out simple regulation, design insulating course position at present and rely on experience more, there is not yet specific high-speed railway
The relevant design of Salty Soil Subgrade insulating course is theoretical.Therefore, salinized soil region high-speed rail roadbed design is a kind of high there is an urgent need to propose
Fast railway Salty Soil Subgrade insulating course design method.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of based on salt-frost heave dual control high-speed railway Salty Soil Subgrade
Insulating course design method scientifically and rationally to determine the design of high-speed railway Salty Soil Subgrade bedding insulating course, and is implemented just
Victory, clear process can be well adapted for Practical Project construction needs.
It is as follows that the present invention solves technical solution used by above-mentioned technology:
The present invention is based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design methods, comprising the following steps:
(1) by live in-situ monitoring, determine that duration is no less than 1 year following different depth h's in Salty Soil Subgrade top surface
Temperature difference t, and draw the Δ t-h figure that abscissa is temperature difference t, ordinate is depth h；
(2) take in step (1) Δ t-h figure the corresponding depth of Δ t=[Δ T] as Salty Soil Subgrade environment temperature sensitive layer
Depth ht；
(3) by the swollen test of salt marsh earth salt, the salt expansive force F of the following different depth h in roadbed top surface is determined, and draw abscissa
For salt expansive force F, the F-h figure that ordinate is depth h；
(4) take in step (3) F-h figure the corresponding depth of F=W as salt expansive force critical balance depth hF；
(5) high-speed railway Coarse Saline embankment insulating course minimum setting depth [h] is determined as follows:
[h]=max { hF, ht}
In formula, [h] is that depth, h is arranged in high-speed railway Coarse Saline embankment insulating course minimumtFor Salty Soil Subgrade ring
Border temperature sensitive depth, hFFor salt expansive force critical balance depth；
(6) it according to the calculated result of step (5), is designed in conjunction with the structure of saline soil area Subgrade Bed of High-speed Railway,
Easy implementation, reasonability and economic analysis are carried out, the final reasonable embedding depth for determining high-speed railway Salty Soil Subgrade insulating course
Spend h.
In the step (1), temperature difference t is that the following different depth salinized soil soil layer in roadbed top surface occurs most in 1 year
Low temperature tminWith highest temperature tmaxThe temperature difference, according to region scene temperature in-situ monitoring data determine.
In the step (2), [Δ T] is determined according to regional temperature observation data combination indoor freezing and thawing cyclic test, works as nothing
When regional experience, [Δ T] takes 6~9 DEG C.
In the step (4), W is above to cover pressure of banketing, W=γ × h1, and wherein γ is above to cover salinized soil bulk density, and h1 is upper
Cover salt marsh soil thickness.
The invention has the advantages that proposing a kind of high-speed railway Coarse Saline embankment insulating course setting depth
It determines method, can determine high speed by salinized soil region environment temperature sensitivity layer depth and salt expansive force with depth change curve
The rational design position of railway Salty Soil Subgrade insulating course, the design for saline soil area high-speed railway subgrade provide foundation, should
Method implementing procedure is clear, easy operation, strong operability, can meet the needs of Practical Project well.
Detailed description of the invention
Fig. 1 is that high speed of the embodiment of the present invention railway Salty Soil Subgrade temperature difference is schemed with depth change curve Δ t-h.
Fig. 2 is that high speed railway Salty Soil Subgrade salt expansive force of the embodiment of the present invention is schemed with depth change curve F-h.
Fig. 3 is that position is arranged based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course in the embodiment of the present invention
Figure.Label 1 is surface layer of subgrade bed in diagram, and 2 be bottom on bedding, and 3 be bottom under bedding, and 4 be the following roadbed of bedding, and 5 be partition
Layer.
Specific embodiment
The present invention is further illustrated below by specific embodiment and in conjunction with attached drawing.
It is of the invention based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method, including following step
It is rapid:
(1) by live in-situ monitoring, determine that duration is no less than the 1 year following different depth h in Salty Soil Subgrade top surface (list
Position: temperature difference t (unit: DEG C) m), and draw the Δ t-h figure that abscissa is temperature difference t, ordinate is depth h；
(2) take in step (1) Δ t-h figure the corresponding depth of Δ t=[Δ T] as Salty Soil Subgrade environment temperature sensitive layer
Depth ht (unit: m)；
(3) by the swollen test of salt marsh earth salt, determine that the salt expansive force F of the following different depth h in roadbed top surface (unit: m) is (single
Position: DEG C), and draw the F-h figure that abscissa is salt expansive force F, ordinate is depth h；
(4) take in step (3) F-h figure the corresponding depth of F=W as salt expansive force critical balance depth hF(unit: m)；
(5) high-speed railway Coarse Saline embankment insulating course minimum setting depth [h] is determined as follows:
[h]=max { hF, ht}
In formula, [h] is that depth (unit: m) is arranged in high-speed railway Coarse Saline embankment insulating course minimum, htFor salt marsh
Dirt road basic ring border temperature sensitive depth (unit: m), hFFor salt expansive force critical balance depth (unit: m)；
(6) it according to the calculated result of step (5), is designed in conjunction with the structure of saline soil area Subgrade Bed of High-speed Railway,
Easy implementation, reasonability and economic analysis are carried out, the final reasonable embedding depth for determining high-speed railway Salty Soil Subgrade insulating course
It spends h (unit: m).
In the step (1), temperature difference t is that the following different depth salinized soil soil layer in roadbed top surface occurs most in 1 year
Low temperature tminWith highest temperature tmaxThe temperature difference, according to region scene temperature in-situ monitoring data determine.
In the step (2), [Δ T] is determined according to regional temperature observation data combination indoor freezing and thawing cyclic test, works as nothing
When regional experience, [Δ T] is 6~9 DEG C desirable.
In the step (4), W is above to cover pressure of banketing, i.e. W=γ × h1, and wherein γ is above to cover salinized soil bulk density (list
Position: kN/m3), h1 is above to cover salt marsh soil thickness (unit: m).
Embodiment:
A certain saline soil area ballastless track of high-speed railway railway bed, raising 5m, top surface width 13.6m, side slope is than 1:
1.5, avoid roadbed from swollen salt, frost heave and roadbed salination disease occur in the roadbed design, it need to be to the high-speed railway road
Insulating course is arranged in base bedding, and should carry out special insulating course design, effectively to prevent salt-frost-heaving deformation and salination disease
Evil.Determine that position is arranged in the insulating course of the coarse grain salinized soil high-speed railway subgrade using the method for the present invention, the specific steps are as follows:
(1) by live in-situ monitoring, determine that duration is no less than 1 year following different depth h's in Salty Soil Subgrade top surface
Temperature difference t, and draw the Δ t-h figure that abscissa is temperature difference t, ordinate is depth h；
(2) take in step (1) Δ t-h figure the corresponding depth of Δ t=[Δ T] as Salty Soil Subgrade environment temperature sensitive layer
Depth ht takes [Δ T]=9 DEG C, ht=1.18m, as shown in Figure 1；
(3) by the swollen test of salt marsh earth salt, determine that the salt expansive force F of the following different depth h in roadbed top surface (unit: m) is (single
Position: DEG C), and draw the F-h figure that abscissa is salt expansive force F, ordinate is depth h；
(4) take in step (3) F-h figure the corresponding depth of F=W as the swollen critical balance depth h of saltF, wherein γ takes
2100kg/cm3, hF=1.36m, as shown in Figure 2；
(5) [h]=max { h is pressedF, ht}=max { 1.56,1.18 }=1.36m can obtain the high-speed railway coarse granule salt marsh
Depth [h]=1.36m is arranged in dirt road dike insulating course minimum.
(6) according to high-speed rail design specification, high-speed rail subgrade bed can be divided into surface layer of subgrade bed 1, bottom layer of subgrade, wherein surface layer of subgrade bed
1 thickness 0.4m, bottom layer of subgrade thickness 2.3m.If insulating course 5 is set on surface layer of subgrade bed 1 and bedding between bottom 2, it is unsatisfactory for walking
Suddenly the minimum setting depth that (5) obtain, if being set to 3 lower part of bottom under bedding, not only width is wide, but also within the scope of bedding bottom
Salinity is easy up to migrate, can only salt content strict control to entire bottom layer of subgrade, this filler demand to saline soil area
Higher, economy is also poor.Therefore, in saline soil area, subgrade bed is divided on bedding bottom 3, base under bottom 2 and bedding
2 thickness 1.0m of bottom, the Coarse Saline using soluble salt content less than 1.5% are filled on bed, 3 thickness 1.3m of bottom under bedding,
Coarse Saline using soluble salt content less than 3% is filled, and insulating course 5 is arranged rationally on the high-speed railway Salty Soil Subgrade
Position is at the interface between bottom 3 under bottom 2 on bedding and bedding, i.e., depth is 1.4m, as shown in Figure 3.
Only using illustrating, the present invention is based on the partitions of salt-frost heave dual control high-speed railway Salty Soil Subgrade for the above
Some principles of layer design method are not intended to for the present invention being confined in shown and described specific method and the scope of application,
Therefore all corresponding modifications that may be utilized and equivalent, belong to the applied the scope of the patents of the present invention.
Claims (5)
1. based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method, comprising the following steps:
(1) by live in-situ monitoring, determine that duration is no less than the temperature difference of 1 year following different depth h in Salty Soil Subgrade top surface
Δ t, and draw the Δ t-h figure that abscissa is temperature difference t, ordinate is depth h；
(2) take in step (1) Δ t-h figure the corresponding depth of Δ t=[Δ T] as Salty Soil Subgrade environment temperature sensitivity layer depth
ht；
(3) by the swollen test of salt marsh earth salt, the salt expansive force F of the following different depth h in roadbed top surface is determined, and drawing abscissa is salt
Expansive force F, the F-h that ordinate is depth h scheme；
(4) take in step (3) F-h figure the corresponding depth of F=W as salt expansive force critical balance depth hF；
(5) high-speed railway Coarse Saline embankment insulating course minimum setting depth [h] is determined as follows:
[h]=max { hF, ht}
In formula, [h] is that depth, h is arranged in high-speed railway Coarse Saline embankment insulating course minimumtFor Salty Soil Subgrade environment temperature
Spend sensitive layer depth, hFFor salt expansive force critical balance depth；
(6) it according to the calculated result of step (5), designs, carries out in conjunction with the structure of saline soil area Subgrade Bed of High-speed Railway
Easy implementation, reasonability and economic analysis, the final reasonable buried depth h for determining high-speed railway Salty Soil Subgrade insulating course.
2. it is as described in claim 1 a kind of based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method,
It is characterized by: in step (1)~(5), by determining Salty Soil Subgrade environment temperature sensitivity layer depth htIt is swollen critical flat with salt
Weigh depth hF, to determine that depth [h] is arranged in high-speed railway Coarse Saline roadbed insulating course minimum.
3. it is as described in claim 1 a kind of based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method,
It is characterized by: in step (1), (2), Salty Soil Subgrade environment temperature sensitivity layer depth htFor Δ t=[Δ T] in Δ t-h figure
Corresponding depth, Δ t are the lowest temperature t that roadbed top surface different depth salinized soil soil layer occurs in 1 yearminWith highest temperature tmax
The temperature difference, [Δ T] according to regional temperature observation data combination indoor freezing and thawing cyclic test determine, when no regional experience, [Δ T]
Take 6~9 DEG C.
4. it is as described in claim 1 a kind of based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method,
It is characterized by: in step (3), (4), salt is swollen critical balance depth hFFor the corresponding depth of F=W in F-h figure, W is above to cover to fill out
Soil pressure, W=γ × h1, wherein γ is above to cover salinized soil bulk density, and h1 is above to cover salt marsh soil thickness.
5. it is as described in claim 1 a kind of based on salt-frost heave dual control high-speed railway Salty Soil Subgrade insulating course design method,
It is characterized by: depth [h]=max { h is arranged in step (5), (6) high-speed railway Coarse Saline embankment insulating course minimumF,
ht}。
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