CN109371771A - A kind of collapsible loess subgrade processing method based on light-weight soils loss of weight principle - Google Patents
A kind of collapsible loess subgrade processing method based on light-weight soils loss of weight principle Download PDFInfo
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- CN109371771A CN109371771A CN201811280630.3A CN201811280630A CN109371771A CN 109371771 A CN109371771 A CN 109371771A CN 201811280630 A CN201811280630 A CN 201811280630A CN 109371771 A CN109371771 A CN 109371771A
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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
Abstract
The invention discloses a kind of collapsible loess subgrade processing methods based on light-weight soils loss of weight principle: by testing the physics for determining certain place different soil, mechanics parameters；Calculate each layer self-weight collapse settlement and saturated yielding amount and self-collapsibility total amount and total collapse；To change with certain density, compression strength, infiltrative light-weight soils and fill out loss of weight, when changing the self-collapsibility for filling out rear place total amount≤70mm, place is changed into non-gravity wet collapse by self-weight collapsible to get to the replacement thickness of light-weight soils.The present invention solves the problems, such as roadbed Collapsing Deformation using the limited thinking filled out of changing of light-weight soils, avoid excess processes, the capital investment of engineering construction, economizing on resources is of great significance to saving, while changing packing course with certain permeability, meets the water penetration road construction requirement in sponge city.
Description
Technical field
The present invention relates to the sponge urban water-through road constructions of collapsible loess area, and in particular to one kind is suitable for collapsibility
The method for processing foundation of loess area road construction.
Background technique
Collapsible loess is distributed widely in northwest China, North China and middle Yellow River regions.In road project, because of loess
The accident that saturated yielding occurs is commonplace, brings very big difficulty to road construction and maintenance, while causing serious economy
Loss.Collapsible loess is a kind of unsaturated under-compacted soil, and has sensibility to water: under native state, native is aqueous
Rate and compressibility is lower, intensity is higher, but when meeting water-soaked, native intensity is significantly reduced, additonal pressure or soil from
Cause Collapsing Deformation under weight power and additonal pressure collective effect.Collapsing Deformation is the mistake that a kind of deflection is big, subsidence velocity is fast
Stability deformation has biggish harm to road, building etc..Loess subgrade saturated yielding and water, burden pressure have close pass
System, collapsibility are the characteristics that loess itself has, and Practical Project is it is not possible that changing for large area is filled out, on rainfall infiltration, level of ground water
Situations such as rising is difficult to control.
The Collapsing Deformation of loess need to have two conditions, first is that water content, second is that pressure.Town road collapsible loess road
The common processing method of base has Sand-gravel-cushion Technioue, heavy-tamping method, compaction pile method, pile foundation method, presoaking, pile foundation method etc..It is above wet
Property loess subgrade processing method is fallen into due to needing to replace whole yellow soil horizon of collapsibility, needs a large amount of artificial, mechanical, financial resources throwings
Enter, and alternate material has blocked moisture to enter roadbed work area and basis, big, the long in time limit, capital investment that leads to that there are project amounts
It is more, and rainwater resource cannot store the deficiency utilized.
Summary of the invention
The purpose of the present invention is to provide a kind of collapsible loess subgrade processing methods based on light-weight soils loss of weight principle.
In order to achieve the above object, the invention adopts the following technical scheme:
By roadbed place collapsible loess since its top soil layer successively change filling out, the replacing method of collapsible loess
It (changes and fills out as the light-weight soils using the replacement thickness with certain density, compression strength and infiltrative light-weight soils, light-weight soils
Correspondence soil layer overall thickness) be less than roadbed place collapsible loess overall thickness.
Preferably, the self-collapsibility grade in the roadbed place is II grade or more.
Preferably, the light-weight soils are selected from cotton stalk fiber light-weight soils, preferably to meet to infiltration required by replacing method
Replacement thickness is effectively reduced in permeability, lightweight and intensity requirement, improves roadbed water penetration.
Preferably, the cotton stalk fiber light-weight soils include raw material native (for example, being made of loess, conveniently gathering materials on the spot) and
Mix material, incorporation material include 0.4%~0.8% cotton stalk fiber of raw material soil weight, 2%~4% cement, 6%~
12% sand, 1%~1.5% EPS particle and 30%~50% water.
Preferably, the replacement thickness (number of plies) be with reference to roadbed place on the spot sampling result be computed it is determining.
Preferably, the replacement thickness calculation method specifically includes the following steps:
1) by geological exploration and test, physics, the mechanical characteristic ginseng of roadbed place difference collapsible loess soil layer are determined
Number；
2) self-weight collapse coefficient of each collapsible loess soil layer is calculated according to the soil properties parameter that step 1) determines；
3) loss of weight is filled out as target to use light-weight soils to change, foundation changes the accumulative gravity pressure for filling out rear soil layer and self-collapsibility system
Number relationship calculates separately the self-weight collapse settlement for respectively changing packing course (i.e. the light weight soil layer that certain layer of collapsible loess is formed after replacing), so
It calculates afterwards and changes the self-collapsibility total amount after filling out；
4) according to the self-collapsibility total amount after filling out is changed, referring to the saturated yielding grade classification of collapsible loess foundation, judgement, which is changed, is filled out
Effect, it is corresponding when changing the self-collapsibility total amount after filling out and meeting roadbed place and be changed into non-gravity wet collapse by self-weight collapsible
The overall thickness for respectively changing packing course be that actual needs is carried out changing the soil thickness filled out with light-weight soils.
Preferably, the initial depth for changing packing course is the earth's surface in the roadbed place.
Preferably, the physics, mechanics parameters include specific gravity, moisture content, density, dry density, natural void ratio, satisfy
With the coefficient of collapsibility under degree and different depth, pressure.
Preferably, described to change the judgment basis for filling out effect specifically: (place is the self-collapsibility total amount≤70mm changed after filling out
Slight saturated yielding belongs to non-gravity wet collapse place).
The beneficial effects of the present invention are embodied in:
The present invention is using light-weight soils loss of weight to reduce lower layer's yellow soil horizon of collapsibility burden pressure as thinking, to collapsible loess
It changes and fills out using lightweight, light-weight soils that are permeable, having some strength progress local finite layer depth, to reduce loess self-collapsibility
Amount, eliminates the self-weight collapsible of roadbed.The present invention can not only eliminate the self-weight collapsible of loess subgrade, while can satisfy road
Rheobase requirement, and roadbed is made to have certain water penetration, rainwash, while nourishment source can be effectively reduced, sea is met
The water penetration road construction requirement in continuous city, is effectively improved urban ecology bad border and living environment.The present invention passes through roadbed place
Limited change of collapsible loess is filled out, and project amount is effectively reduced, and the capital investment to engineering construction is saved economizes on resources with important
Realistic meaning.
Detailed description of the invention
Fig. 1 is different depth (3-10m) coefficient of collapsibility and pressure relationship plot figure in embodiment 1,2.
Fig. 2 is different depth coefficient of collapsibility (1-10m) and pressure relationship plot figure in embodiment 3.
Fig. 3 is different depth (11-20m) coefficient of collapsibility and pressure relationship plot figure in embodiment 3.
Fig. 4 is different depth (21-30m) coefficient of collapsibility and pressure relationship plot figure in embodiment 3.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
(1) cotton stalk fiber light-weight soils and its preparation
The present invention is filled out by changing roadbed place upper layer loess as light-weight soils, using light-weight soils loss of weight to reduce lower layer's loess
Burden pressure, to reduce Loess Collapsibility amount.For this purpose, present invention firstly provides a kind of cotton stalk fiber light-weight soils, the cotton stalk fiber
Light-weight soils include raw material soil and incorporation material, and incorporation material includes the cotton stalk fiber of raw material soil weight 0.4%~0.8%, original
Expect the native cement of weight 2%~4%, the sand of raw material soil weight 6%~12%, raw material soil weight 1%~1.5% EPS particle
And the water of raw material soil weight 30%~50%.
The cotton stalk fiber light-weight soils be using EPS particle as light material component, with raw material soil, water, cotton stalk fiber, sand and
Cement be cementing material component, and by light material with cementing material through mixing and a kind of manufactured stabilized light soil material.
The source of the raw material soil is loess.
The cement is selected from ordinary portland cement, and the sand is selected from building sand (partial size≤1.6mm).
The partial size of the EPS particle is 1~3mm, and EPS particle packing volume density is 0.0087g/cm3, pure grain density is
0.0137g/cm3。
The preparation method of above-mentioned cotton stalk fiber light-weight soils, comprising the following steps:
Cotton stalk is successively crushed first, takes skin, plays fine, washing and dry, obtained cotton stalk fiber；Then add water to
Raw material soil, cotton stalk fiber, cement and sand mixture in, cementing material is made；Finally EPS particle is mixed with cementing material,
Be made cotton stalk fiber light-weight soils, the cotton stalk fiber, cement, sand, EPS particle and water dosage be followed successively by raw material soil weight
0.4%~0.8%, 2%~4%, 6%~12%, 1%~1.5% and 30%~50%.
The preparation method of the cotton stalk fiber specifically includes the following steps:
1.1) cotton stalk is crushed in pulverizer, obtains being cut to 50mm~300mm long cotton stalk；
1.2) by by step 1.1) cutting cotton stalk it is successively soaking and remove marrow, obtain cotton stalk skins；
1.3) cotton stalk skins are beaten repeatedly, until being changed into threadiness；
1.4) after step 1.3), cotton stalk skins is washed and retain fiber part, then by fiber part naturally dry.
The preparation method of the cementing material is specifically includes the following steps: by raw material soil and raw material soil weight 6%~12%
Building sand, the cotton stalk fiber of raw material soil weight 0.4%~0.8% and the normal silicate water of raw material soil weight 2%~4%
Mud mixes to obtain mixture, and the water of raw material soil weight 30%~50% is sprayed into mixture.
The preparation method of the raw material soil the following steps are included: take a certain amount of loess, by drying (100~105 DEG C,
It is 12 hours dry or more) 0.5mm sieve is crossed afterwards, obtain evengranular raw material soil.
The cotton stalk fiber light-weight soils introduce cotton stalk fiber as light on the basis of EPS particle (for light material component)
Local soil type point is measured, the pressure banketed can be not only mitigated, intensity of banketing is improved, and there is preferable permeability, meets sponge city
The water penetration road construction requirement in city.Compared with existing Technique of Light-weight Soil, the cotton stalk fiber light-weight soils are particularly advantageous in that
Lightness, high epistasis, preferable water penetration.
The present invention using raw material soil and incorporation material prepare light-weight soils, mix material in containing cotton stalk fiber, cement,
Sand, EPS particle and water, it is Lightness, high that the weight ratio that each incorporation material accounts for raw material soil determines that prepared light-weight soils have
Epistasis, preferable water penetration, and can according to need the ratio of the components such as adjustment cement, acquisition individual features are strengthened light
Amount soil, is more in line with the practical application needs of light-weight soils.
Above-mentioned cotton stalk fiber light-weight soils density range are as follows: 1.025~1.215g/cm3, it is based on light-weight soils loss of weight for convenience
The collapsible loess subgrade of principle is handled, and being specifically prepared for density is about 1.10g/cm3And 1.20g/cm3Two kinds of cotton stalk fibers
Light-weight soils.Wherein, density is about 1.10g/cm3Cotton stalk fiber light-weight soils mix material mixture ratio are as follows: cotton stalk fiber volume
0.6%, cement mixing content 3.0%, sand volume 7.5%, EPS particle volume 1.2%, water volume 40%, the light-weight soils without lateral confinement
Compression strength is 114.59kPa, and infiltration coefficient is 6.84 × 10-5cm/s；Density is about 1.20g/cm3Cotton stalk fiber light-weight soils
Mix material mixture ratio are as follows: cotton stalk fiber volume 0.7%, cement mixing content 4.0%, sand volume 10.5%, EPS particle volume 1.0%,
Water volume 40%, the unconfined compressive strength of the light-weight soils are 191.68kPa, and infiltration coefficient is 4.1 × 10-7cm/s。
(2) the collapsible loess subgrade processing method based on light-weight soils loss of weight principle
Embodiment 1
The first step surveys acquisition place one (Guanzhong area collapsible loess area) soil sample by ground, and determines field by testing
The physical parameter of one different soil of ground, for example, specific gravity, moisture content, density, dry density, natural void ratio, saturation degree, according to
" SL237-1999 earthwork test rule " method calculates the saturation degree of each layer collapsible loess under different pressures using the above parameter
85% moisture content (for calculating the wet density of saturation degree 85%), the wet density of saturation degree 85%, gravity pressure are (according to saturation
Wet density when spending 85% calculates), collapse initial compression, coefficient of collapsibility, referring to table 1-1 (n=8).Wherein, coefficient of collapsibility is to sentence
Determine the parameter of place saturated yielding degree, different depth coefficient of collapsibility and pressure relationship plot are as shown in Figure 1.
One centrifugal modeling account of the place table 1-1.
Second step, according to self-weight collapse settlement Δ zs and saturated yielding in " GB50025-2004 Code for building construction in collapsible loess zone "
The calculation formula for measuring Δ s, calculates each layer self-weight collapse settlement and saturated yielding amount and self-collapsibility total amount (is counted from earth's surface until most lower
One layer) and total collapse (being counted from earth's surface until basecoat), it the results are shown in Table 1-2.
(n=8 changes packing course density 1.1g/cm to one self-weight collapse settlement computational chart of the place table 1-2.3)
Note: A1: report provides saturation gravity pressure；A2: the moisture content of saturation degree 85%；A3: wet close when saturation degree 85%
Degree；A4: packing course density is changed；A5: gravity pressure is calculated according to 85% wet density of saturation degree；A6: it changes and fills out rear gravity pressure；A7: from
Weight coefficient of collapsibility；A8: it changes and fills out rear self-weight collapse coefficient；A9: each layer self-weight collapse settlement；A10: the self-collapsibility counted from ground is total
Amount；A11: it changes and fills out rear each layer self-weight collapse settlement；A12: the self-collapsibility total amount counted after filling out from ground is changed；A13: each layer saturated yielding
Amount；A14: the total collapse counted from ground.
Third step, it is assumed that taking density is 1.1g/cm3Cotton stalk fiber light-weight soils to n-layer collapsible loess from top to bottom by
Layer, which changes, fills out loss of weight, calculates the gravity pressure and accumulative gravity pressure for changing packing course, looks into different depth saturated yielding according to accumulative gravity pressure
Coefficient and pressure relationship plot obtain the self-weight collapse coefficient for changing packing course, calculate each layer self-weight collapse settlement and self-collapsibility total amount
(being counted from earth's surface until basecoat), referring to table 1-2.
The accumulative gravity pressure is calculated according to the gravity pressure of corresponding soil layer, the meter of each soil layer gravity pressure
Calculate formula are as follows:
Pzs=ρ hi
Wherein, PzsFor i-th layer of native gravity pressure (kPa)；ρ is i-th layer of native density (g/cm3)；hiIt is native for i-th layer
Thickness (cm), i=1,2 ..., n.
4th step, according to the self-collapsibility total amount after filling out is changed, referring to the saturated yielding grade classification table of collapsible loess foundation
(" GB50025-2004 Code for building construction in collapsible loess zone ") determines: when changing the total amount of the self-collapsibility after filling out≤70mm, field
Ground is changed into non-gravity wet collapse by self-weight collapsible, otherwise, continue calculate change fill out next layer after the corresponding self weight changed after filling out
Saturated yielding total amount.
It is calculated through above step, place one belongs to self-weight collapse loess, with density is 1.1g/cm by the place3Cotton
Stalk fiber light-weight soils change filling out loss of weight, and changing packing course overall thickness is 1m, and place self-collapsibility total amount reduces to 32.4mm by 89.1mm,
The place becomes non-gravity wet collapse from self-weight collapsible.
The practical altering fill of calculated result progress is filled out according to changing.
Embodiment 2
The first step surveys acquisition place one (Guanzhong area collapsible loess area) soil sample by ground, and determines field by testing
The physical parameter of one different soil of ground, for example, specific gravity, moisture content, density, dry density, natural void ratio, saturation degree, and calculate
Gravity pressure, collapse initial compression, coefficient of collapsibility, referring to table 1-1, different depth coefficient of collapsibility and pressure relationship plot such as Fig. 1
It is shown.
Second step, according to self-weight collapse settlement Δ zs and saturated yielding in " GB50025-2004 Code for building construction in collapsible loess zone "
The calculation formula for measuring Δ s, calculates each layer self-weight collapse settlement and saturated yielding amount and self-collapsibility total amount (is counted from earth's surface until most lower
One layer) and total collapse (being counted from earth's surface until basecoat), it the results are shown in Table 2-1.
(n=8 changes packing course density 1.2g/cm to one self-weight collapse settlement computational chart of the place table 2-1.3)
Note: A1: report provides saturation gravity pressure；A2: the moisture content of saturation degree 85%；A3: wet close when saturation degree 85%
Degree；A4: packing course density is changed；A5: gravity pressure is calculated according to 85% wet density of saturation degree；A6: it changes and fills out rear gravity pressure；A7: from
Weight coefficient of collapsibility；A8: it changes and fills out rear self-weight collapse coefficient；A9: each layer self-weight collapse settlement；A10: the self-collapsibility counted from ground is total
Amount；A11: it changes and fills out rear each layer self-weight collapse settlement；A12: the self-collapsibility total amount counted after filling out from ground is changed；A13: each layer saturated yielding
Amount；A14: the total collapse counted from ground；
Third step, it is assumed that taking density is 1.2g/cm3Cotton stalk fiber light-weight soils to n-layer collapsible loess from top to bottom by
Layer, which changes, fills out loss of weight, calculates the gravity pressure and accumulative gravity pressure for changing packing course, looks into different depth saturated yielding according to accumulative gravity pressure
Coefficient and pressure relationship plot obtain the self-weight collapse coefficient for changing packing course, calculate each layer self-weight collapse settlement and self-collapsibility total amount
(being counted from earth's surface until basecoat), referring to table 2-1.
4th step, according to the self-collapsibility total amount after filling out is changed, referring to the saturated yielding grade classification table of collapsible loess foundation
(" GB50025-2004 Code for building construction in collapsible loess zone ") determines: when changing the total amount of the self-collapsibility after filling out≤70mm, field
Ground is changed into non-gravity wet collapse by self-weight collapsible, otherwise, continue calculate change fill out next layer after the corresponding self weight changed after filling out
Saturated yielding total amount.
It is calculated through above step, is 1.2g/cm with density3Cotton stalk fiber light-weight soils change filling out loss of weight, it is total to change packing course
With a thickness of 4m, place self-collapsibility total amount reduces to 30.6mm by 89.1mm, which becomes non-self-collapsibility from self-weight collapsible
Property.
The practical altering fill of calculated result progress is filled out according to changing.
Embodiment 3
The first step surveys acquisition place two (Guanzhong area collapsible loess area) soil sample by ground, and determines field by testing
The physical parameter of two different soil of ground, for example, specific gravity, moisture content, density, dry density, natural void ratio, saturation degree, and calculate
Gravity pressure, collapse initial compression, coefficient of collapsibility, referring to table 3-1 (n=30), different depth coefficient of collapsibility and pressure dependence are bent
Line is shown as shown in Figure 2, Figure 3 and Figure 4.
Two centrifugal modeling account of the place table 3-1.
Second step, according to the calculating of self-weight collapse settlement Δ zs in " Code for building construction in collapsible loess zone " and saturated yielding amount Δ s
Formula calculates each layer self-weight collapse settlement and saturated yielding amount and self-collapsibility total amount (being counted from earth's surface until basecoat) and always wet
Amount (being counted from earth's surface until basecoat) is fallen into, the results are shown in Table 3-2.
(n=30 changes packing course density 1.1g/cm to two self-weight collapse settlement computational chart of the place table 3-2.3)
Note: A2: the moisture content of saturation degree 85%；A3: wet density when saturation degree 85%；A4: packing course density is changed；A5: according to
85% wet density of saturation degree calculates gravity pressure；A6: it changes and fills out rear gravity pressure；A7: self-weight collapse coefficient；A8: it changes after filling out and is self-possessed
Coefficient of collapsibility；A9: each layer self-weight collapse settlement；A10: the self-collapsibility total amount counted from ground；A11: change that fill out rear each layer self weight wet
Fall into amount；A12: the self-collapsibility total amount counted after filling out from ground is changed；A13: each layer saturated yielding amount；A14: the total saturated yielding counted from ground
Amount.
Third step, it is assumed that taking density is 1.1g/cm3Cotton stalk fiber light-weight soils to n-layer collapsible loess from top to bottom by
Layer, which changes, fills out loss of weight, calculates the gravity pressure and accumulative gravity pressure for changing packing course, looks into different depth saturated yielding according to accumulative gravity pressure
Coefficient and pressure relationship plot obtain the self-weight collapse coefficient for changing packing course, and calculating, which is changed, fills out rear each layer self-weight collapse settlement and be self-possessed wet
Total amount (being counted from earth's surface until basecoat) is fallen into, referring to table 3-2.
4th step, according to the self-collapsibility total amount after filling out is changed, referring to the saturated yielding grade classification table of collapsible loess foundation
(" GB50025-2004 Code for building construction in collapsible loess zone ") determines: when changing the total amount of the self-collapsibility after filling out≤70mm, field
Ground is changed into non-gravity wet collapse by self-weight collapsible, otherwise, continue calculate change fill out next layer after the corresponding self weight changed after filling out
Saturated yielding total amount.
It is calculated through above step, place two belongs to self-weight collapse loess, with density is 1.1g/cm by the place3Cotton
Stalk fiber light-weight soils change filling out loss of weight, change packing course overall thickness be 5m, place self-collapsibility total amount by 169.9mm reduce to
63.5mm, the place become non-gravity wet collapse from self-weight collapsible.
The practical altering fill of calculated result progress is filled out according to changing.
Compared with the prior art, the advantages of the present invention are as follows:
1, the present invention remain down from the certain thickness mode of the limited replacement of earth's surface using to collapsible loess subgrade
The collapsible loess of layer can save the raw material such as a large amount of concrete, water, lime, reduce the wastes such as spoir in work progress
Discharge, reduce construction equipment energy consumption and exhaust gas discharge, achieve the purpose that it is energy saving, water-saving, save material and environmental protection.
2, the cotton stalk fiber light-weight soils that the present invention uses have certain Permeable characteristic and compression strength, solve the problems, such as saturated yielding
While, moreover it is possible to rainwater resource is discharged into underground, prevents surface gathered water, feeds underground water.
In short, the theory that the present invention is fallen into according to loss of weight dehumidification, the method filled out is changed using light-weight soils loss of weight, there is theoretical basis,
Also there is practical application.It changes and fills out rear soil layer without collapsibility, and due to changing (light-weight soils) lighter weight of banketing, reduce subsoil
The gravity pressure of body (collapsible loess) significantly improves place entirety collapsibility, and meets the water penetration road in sponge city
Road construction requirements.
Claims (9)
1. a kind of collapsible loess subgrade processing method, it is characterised in that: the following steps are included:
Roadbed place collapsible loess successively change filling out since the soil layer of top, the replacing method of collapsible loess is using light
The replacement thickness of amount soil, light-weight soils is less than roadbed place collapsible loess overall thickness.
2. a kind of collapsible loess subgrade processing method according to claim 1, it is characterised in that: the roadbed place from
Saturated yielding grade is II grade or more again.
3. a kind of collapsible loess subgrade processing method according to claim 1, it is characterised in that: the light-weight soils are selected from cotton
Stalk fiber light-weight soils.
4. a kind of collapsible loess subgrade processing method according to claim 3, it is characterised in that: the cotton stalk fiber light weight
Soil include raw material soil and incorporation material, incorporation material include the cotton stalk fiber of raw material soil weight 0.4%~0.8%, 2%~
4% cement, 6%~12% sand, 1%~1.5% EPS particle and 30%~50% water.
5. a kind of collapsible loess subgrade processing method according to claim 1, it is characterised in that: the replacement thickness is ginseng
Examine roadbed place on the spot sampling result be computed it is determining.
6. according to claim 1 or a kind of 5 collapsible loess subgrade processing methods, it is characterised in that: the replacement thickness
Calculation method specifically includes the following steps:
1) by geological exploration and test, physics, the mechanics parameters of roadbed place difference collapsible loess soil layer are determined；
2) self-weight collapse coefficient of each collapsible loess soil layer is calculated according to the soil properties parameter that step 1) determines；
3) loss of weight is filled out as target to use light-weight soils to change, close according to the accumulative gravity pressure for filling out rear soil layer is changed with self-weight collapse coefficient
System calculates the self-weight collapse settlement for respectively changing packing course, then calculates and changes the self-collapsibility total amount after filling out；
4) according to the self-collapsibility total amount after filling out is changed, referring to the saturated yielding grade classification of collapsible loess foundation, judgement, which is changed, fills out effect,
It is corresponding respectively to change when changing the self-collapsibility total amount after filling out and meeting roadbed place and be changed into non-gravity wet collapse by self-weight collapsible
The overall thickness of packing course is that actual needs is carried out changing the soil thickness filled out with light-weight soils.
7. a kind of collapsible loess subgrade processing method according to claim 6, it is characterised in that: the starting for changing packing course
Depth is the earth's surface in the roadbed place.
8. a kind of collapsible loess subgrade processing method according to claim 6, it is characterised in that: the physics, mechanics are special
Property parameter includes the saturated yielding system under specific gravity, moisture content, density, dry density, natural void ratio, saturation degree and different depth, pressure
Number.
9. a kind of collapsible loess subgrade processing method according to claim 6, it is characterised in that: described change fills out sentencing for effect
Determine foundation specifically: change the total amount of the self-collapsibility after filling out≤70mm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996004426A1 (en) * | 1994-08-02 | 1996-02-15 | Vsevolod Anatolievich Mymrin | Composite material and method of using said material to construct foundations for roads and terrestrial structures |
| CN1385389A (en) * | 2002-06-20 | 2002-12-18 | 同济大学 | Light subgrade material and preparation method thereof |
| CN101187194A (en) * | 2007-12-07 | 2008-05-28 | 东南大学 | Hydraulic fill sand expansion polystyrene mixing light road bank stuffing filling and construction method |
| KR100924133B1 (en) * | 2009-04-21 | 2009-10-29 | 김재원 | Pavement composition for soil road, preparation thereof, and method for paving soli road using it |
| CN102505598B (en) * | 2011-10-09 | 2014-03-19 | 中铁六局集团有限公司 | Method for reinforcement construction of soft soil foundation by exchange-filling with foam lightweight soil |
-
2018
- 2018-10-30 CN CN201811280630.3A patent/CN109371771B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996004426A1 (en) * | 1994-08-02 | 1996-02-15 | Vsevolod Anatolievich Mymrin | Composite material and method of using said material to construct foundations for roads and terrestrial structures |
| CN1385389A (en) * | 2002-06-20 | 2002-12-18 | 同济大学 | Light subgrade material and preparation method thereof |
| CN101187194A (en) * | 2007-12-07 | 2008-05-28 | 东南大学 | Hydraulic fill sand expansion polystyrene mixing light road bank stuffing filling and construction method |
| KR100924133B1 (en) * | 2009-04-21 | 2009-10-29 | 김재원 | Pavement composition for soil road, preparation thereof, and method for paving soli road using it |
| CN102505598B (en) * | 2011-10-09 | 2014-03-19 | 中铁六局集团有限公司 | Method for reinforcement construction of soft soil foundation by exchange-filling with foam lightweight soil |
Non-Patent Citations (1)
| Title |
|---|
| 牛昴懿: "泡沫轻质土用于软基上高速公路扩建工程的受力与变形特性分析", 《中国优秀硕士学位论文全文数据库》 * |
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