CN107476158B - Areas formerly flooded by the Huanghe River high liquid limit clay embankment Con trolling index determines method and compaction technology - Google Patents
Areas formerly flooded by the Huanghe River high liquid limit clay embankment Con trolling index determines method and compaction technology Download PDFInfo
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- CN107476158B CN107476158B CN201710818086.2A CN201710818086A CN107476158B CN 107476158 B CN107476158 B CN 107476158B CN 201710818086 A CN201710818086 A CN 201710818086A CN 107476158 B CN107476158 B CN 107476158B
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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 areas formerly flooded by the Huanghe River high liquid limit clay embankment Con trolling index to determine method and compaction technology, based on the physical and mechanical property of areas formerly flooded by the Huanghe River high liquid limit clay, propose the soil moisture content and compaction Control index of economical and efficient: the target moisture content range in railway embankment area is [optimum moisture content Wopt- 2%, optimum moisture content Wopt+ 6%], compactness is not less than 88%；To reach the Con trolling index, that organizes Roadbed Soil in reasonable and orderly manner takes soil and sunning, and the compaction technology in face 1 time is received using the smooth-wheeled roller static pressure 1 time-cam road roller for the being suitable for clay roadbed 4 times-pneumatic-tired rollers that shake by force, significantly improve Subgrade Compaction Quality, subgrade compaction intensity is promoted, it is indefinite to solve the problems, such as that high liquid limit clay subgrade construction rolls difficulty, index of banketing.This method economy, quick and consolidation effect significantly have broad application prospects in Use of High Liquid Clay for Subgrade Filling.
Description
Technical field
The present invention relates to Simulation analysis of behavior of stress of high filling culvert fields more particularly to one kind can be applied to the high liquid limit in areas formerly flooded by the Huanghe River
The determination method and construction technology of filler target moisture content during clay embankment and compactness.
Background technique
The middle and lower reaches areas formerly flooded by the Huanghe River lake siltation high liquid limit clay carried and formed over long distances through the Yellow River, is distributed widely in Shandong Shandong
Northwest and Southwestern Shandong, are mainly made of powder and clay, and coarse-grained soil is substantially not present.Wherein, silt content highest accounts for
65.5~72.2%；Clay content takes second place, and accounts for 22~36.3%.Silt content is between areas formerly flooded by the Huanghe River silt and southern high liquid limit clay
Between, although the powder of such soil accounts for the overwhelming majority, the plasticity of the soil body shows viscous soil characteristics: liquid limit 45~60%, modeling
Limit 22~36%, plasticity index 23.5~26.4.According to the diagram of forgeability behaviour of particulate soil classification, it is located at A line or more, near B line,
Most soil sample liquid limits are higher than 50%, and in terms of worst angle, the soil body belongs to the range of high liquid limit clay.But with it is general
High liquid limit clay is compared, and the silt content of such soil is obviously higher, causes its Atterberg Limit relatively low；Moreover, through the microcosmic knot of Electronic Speculum
The powder particle of structure scanning discovery Shandong areas formerly flooded by the Huanghe River does not have the common sheet or acicular texture of silt, has no apparent corner angle,
The psephicity of particle is higher, and this is mainly due to the long-times through the Yellow River water flow to impregnate, particles hit and current scour act on,
Grain surface layer is broken, peels off serious, the embedding structure of not formed mutual mistake between powder particle.Since silt content is higher, pore
Gap is flourishing, has property easy to moisture absorption, meets water sensitive；Clay content less than 0.002mm is higher than 22%, the interfacial effect with water effect
By force, high viscous force and water-retaining property are shown.Therefore, rounding powder and the clay composition of high level, determines that Shandong Huang is general
The distinctive intensity of area's high liquid limit clay and deformation characteristic.
China's " highway subgrade design specification " regulation: liquid limit is greater than high liquid limit soil of the 50%, plasticity index greater than 26 cannot
It is directly used in roadbed filling.In the northwest in Shandong Province and plain areas in southwest Shandong province that topography is flat, it is other banket take soil resource very deficient,
If giving it up, huge economic loss and environmental problem will be caused.Currently, in high liquid limit clay subgrade construction most critical two
A problem are as follows: (1) filler moisture content and compaction Control index；(2) roadbed on-site rolling technique.Ministry of Communications's highway scientific research
It waits and proposes with CBR (California bearing ratio) to propose for strength control target for Fujian high liquid limit clay
When control moisture content range 25~32% (optimum moisture content 25%), virtual resurfacing thickness 20cm and heavy type roll 8~10 times,
It can guarantee that the CRB value of embankment after being compacted meets code requirement.Hohai University is directed to the high liquid limit clay in Guangxi and Guangdong, in soil
Under the premise of body CBR value meets code requirement, propose when controlling moisture content range not higher than optimum moisture content 6%, by 11
Time heavy road roller roll and can guarantee that compactness reaches 90%.But above-mentioned moisture content determines method and rolls accordingly
Technique is only applicable to the higher southern high liquid limit clay of clay content.Since the silt content of areas formerly flooded by the Huanghe River high liquid limit clay is higher,
CBR value is generally unsatisfactory for code requirement, therefore the determination method of the moisture content and corresponding compaction technology are not suitable for areas formerly flooded by the Huanghe River height
The filling construction of liquid limit clay roadbed.
Summary of the invention
The present invention be directed to areas formerly flooded by the Huanghe River roadbed filling during filler there is a serious shortage in the supply, high liquid limit clay initial aqueous rate is very high and
Soil capability index, which is unsatisfactory for filling as defined in specification, requires problem, proposes a kind of areas formerly flooded by the Huanghe River high liquid limit clay embankment filled soil target
The determination method and physics compaction technology of moisture content and compactness are guaranteeing railway embankment intensity, the premise of rigidity and stability
Under, road is pressed using the soil moisture content and compaction Control index of economical and efficient, and using 1 time-cam of smooth-wheeled roller static pressure
The machine 4 times-pneumatic-tired rollers that shake by force receive the compaction technology in face 1 time, rationally using areas formerly flooded by the Huanghe River high liquid limit clay and to solve high liquid limit viscous
The problem of dirt road base construction rolling difficulty, is greatly reduced project cost.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of areas formerly flooded by the Huanghe River high liquid limit clay embankment Con trolling index determines method, which is characterized in that aqueous including target
The determination method of rate and compactness is as follows:
Determine the ingredient of areas formerly flooded by the Huanghe River high liquid limit clay, particle composition and physical characteristic should meet: silt content accounts for 65.5%
~72.2%, clay content accounts for 22%~36.3%, liquid limit 45%~60%, plastic limit 22%~36%；
Areas formerly flooded by the Huanghe River high liquid limit clay soil sample is prepared through wet process, obtains optimum moisture content W according to modified compaction testoptWith it is right
The maximum dry density γ answereddmax；
Determine the lower limit value of areas formerly flooded by the Huanghe River high liquid limit clay embankment filled soil moisture content:
Clearly stipulate that the moisture content of filler should be controlled most when Highway Embankment Compaction is constructed in " Highway Roadbed Construction Technology specification "
Excellent moisture content WoptIn ± 2% range, which is for all types of fillers.The present invention is directed to high liquid limit clay filler, purport
Iing is proposed a kind of water content control range for being able to satisfy high liquid limit clay embankment.Since the natural moisture content of high liquid limit soil generally compares
Optimum moisture content is high by 10% or more, is difficult that the moisture content of high liquid limit soil is down to optimal contain in a short time by the method for sunning
Within ± 2% range of water rate.Therefore, the moisture content of areas formerly flooded by the Huanghe River high liquid limit clay is adjusted mainly for upper limit value, lower limit
Value is still by the optimum moisture content W in " Highway Roadbed Construction Technology specification "opt- 2% is determined.
It determines the upper limit value of areas formerly flooded by the Huanghe River high liquid limit clay embankment filled soil moisture content: difference being obtained according to indoor triaxial test and is contained
Water rate and volumetric water content under compactness state and static strength are divided into high-intensitive low-water-content than relation curve
Area, the stable aqueous rate area and low intensive high-moisture percentage area for having some strength, finally choose the upper limit in stable aqueous rate area
Value determination obtains；
Compactness K is determined using following formula:
Wherein, air factor VaTake 6%, GsFor the specific gravity of soil, w is moisture content (%), γdmaxFor the maximum dry density (g/ of soil
cm3)。
Further, the target moisture content range banketed is [optimum moisture content Wopt- 2%, optimum moisture content Wopt+
6%].
Further, the fill compaction degree is not less than 88%.
Further, the compaction subgrade modulus of resilience is not less than 30MPa, and the compressed coefficient is not higher than 0.2MPa-1, cohesive strength
Not less than 100kPa, static strength ratio is not less than 1.0, meets the subgrade stability requirement of maximum filling height 18m.
Further, the static strength is than 1/2 for the ratio between deviator stress and confining pressure.
Further, the high-intensitive low-water-content area refers to static strength than the moisture content area greater than 2；The tool
The stable aqueous rate area of standby some strength refers to static strength than the moisture content area between 1~2；The low intensive height contains
The area Shui Shuai refers to static strength than the moisture content area lower than 0.5.
The present invention also provides a kind of site physical compaction technologies of areas formerly flooded by the Huanghe River high liquid limit clay roadbed, press road using halo
Machine static pressure 1 time；Cam road roller shakes by force 4 times；The compaction technology that pneumatic-tired rollers receipts face is 1 time.
Further, the site physical compaction technology of the areas formerly flooded by the Huanghe River high liquid limit clay roadbed, it is characterised in that: specific
Steps are as follows:
Step 1 measures the initial aqueous rate banketed, if meeting target moisture content range [optimum moisture content Wopt- 2%, it is optimal
Moisture content Wopt+ 6%], it can be directly used for decking and rolling；If initial aqueous rate is more than target moisture content range, needs to pave and turn over
It shines to target moisture content range；
Step 2 is rolled: 1. carry out 20 tonnage smooth-wheeled roller static pressure, round-trip 1 time；2. carrying out 20 tonnage cams pressure road
Machine vibration rolls, and round-trip 4 times；3. last 30 tonnage pneumatic-tired rollers covers；
Step 3 carries out Subgrade Compaction detection in the way of escape that every layer of Roadbed Soil rolls end, and compactness detection is not up to
88% part should carry out 20 tonnage cam road roller ftercompctions.
Further, in the site physical compaction technology of the areas formerly flooded by the Huanghe River high liquid limit clay roadbed, the thickness that paves
Degree is 35cm ± 2cm, first carries out pulverization process with road-mixed machine, guarantees earth material without large-scale grume, and then bull-dozer is flattened, and is protected
It is smooth that card rolls working face.
Further, in the site physical compaction technology of the areas formerly flooded by the Huanghe River high liquid limit clay roadbed, described teds work
Sequence are as follows: 1. excavator ted, slightly put down for the first time, dries 2-3 days；2. excavator is tedded for the second time, slightly put down, 2- is dried
3 days；3. five-furrow plough is tedded, interval time is 1 day/time, carries out moisture content detection to the earth material after sunning, detection cycle is
1 times/day；The worst case meteorological conditions for tedding that the time does not include rainfall and temperature is lower than zero degree that pave.
The invention has the following advantages:
The present invention takes soil and sunning by tissue Roadbed Soil in reasonable and orderly manner, carries out to filler moisture content and compactness
It cost-effectively controls, is conducive to improve construction efficiency, shorten the construction period；Using the smooth-wheeled roller static pressure 1 for being suitable for clay roadbed
The construction technology in face 1 time is received all over-cam road roller 4 times-the pneumatic-tired rollers that shake by force, Subgrade Compaction Quality can be significantly improved,
Promote subgrade compaction intensity.A whole set of new high liquid limit roadbed compaction technology can be in large-scale application in high liquid limit clay roadbed
It fills, solves the problems, such as the filling roadbed uncontrollable consolidation effect of high liquid limit clay, have broad application prospects.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
The partial size distribution curve of the areas formerly flooded by the Huanghe River Fig. 1 high liquid limit clay；
The areas formerly flooded by the Huanghe River Fig. 2 high liquid limit clay tamping curve；
The static strength of the areas formerly flooded by the Huanghe River Fig. 3 lake siltation high liquid limit clay is than the relationship with volumetric water content；
The relationship of the areas formerly flooded by the Huanghe River Fig. 4 the high liquid limit clay compressed coefficient and moisture content.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Below in conjunction with embodiment, clear, complete description is carried out to the technical solution in the present invention.
Embodiment background: moral quotient's highway Xiajin to Liaocheng section is North gets green silver-colored highway Xiajin Interchange Terminal, through moral
State city, west, Xiajin County, Liaocheng Linqing City east, main track mileage are K40+900~K61+800, main track overall length 20.9km.Wherein road and bridge
It is that Xisha river takes Tu Chang that one mark engineering design, which takes Tu Chang, and design takes native 1,400,000 sides, and it is the Yellow River erosion and deposition product lacustrine soil that this, which takes Tu Chang,
Take native field 2m the following are typical areas formerly flooded by the Huanghe River high liquid limit clay, in as a form of gel, natural moisture content is between 30%~40%, Bu Nengyong
It is filled in the continuity of roadbed.Experiment Road chooses K49+550-K49+750 sections, and test segment length is 200m.
High liquid limit clay Roadbed Soil moisture control technique and the detailed process of physics compaction technology are as follows:
1, areas formerly flooded by the Huanghe River high liquid limit clay is [optimum moisture content W for the target moisture content range in railway embankment areaopt- 2%,
Optimum moisture content Wopt+ 6%], compactness is not less than 88%, and premenstruum (premenstrua) a large amount of indoor and outdoor tests research and calculating are analyzed, the shape
The compaction subgrade modulus of resilience under state is not less than 30MPa, and the compressed coefficient is not higher than 0.2MPa-1, cohesive strength is not less than 100kPa, full
The subgrade stability requirement of foot maximum filling height 18m；
2, areas formerly flooded by the Huanghe River high liquid limit clay described in 1 is the Yellow River middle and lower reaches lake warp, and particle composition and physical characteristic are full
Foot: silt content accounts for 65.5%~72.2%, and clay content accounts for 22%~36.3%, liquid limit 45%~60%, and plastic limit 22%~
36%；
Enchashment field embankment carries out grain size analysis in laboratory with soil, shown in the following chart of test result.
1 areas formerly flooded by the Huanghe River high liquid limit clay particle of table composition
Areas formerly flooded by the Huanghe River lake siltation high liquid limit clay contains a small amount of flour sand, based on powder, there is a higher clay content, clay with
The content of powder accounts for 90% or more.Wherein, the silt content of 0.075-0.002mm is 65.5%, and the clay less than 0.002mm contains
Amount accounts for 28.7%.
Enchashment field embankment carries out combined measurement method of liquid and plastic limits test with soil, measures liquid limit 58.1%, plastic limit 27.1%.
3, optimum moisture content W described in 1optWith corresponding maximum dry density γdmaxBe through wet process preparation soil sample according to
Modified compaction test obtains；
Tamping curve as shown in Figure 2 is it is found that soil sample optimum moisture content WoptIt is 16.9%, maximum dry density γdmaxFor
1.802g·cm-3。
4, (the optimum moisture content W of the target moisture content upper limit described in 1optIt+6%) is obtained not according to indoor triaxial test
With under moisture content and compactness state volumetric water content and static strength than relation curve, and then be divided into high-intensitive (static strength
It is (more quiet than being greater than low-water-content area 2), the stable aqueous rate area (static strength ratio is between 1~2) for having some strength and low-intensity
Lower than high-moisture percentage area 0.5), the upper limit value determination for finally choosing stable aqueous rate area obtains intensity ratio.
Fig. 3 show the static strength of areas formerly flooded by the Huanghe River lake siltation high liquid limit clay than the relationship with volumetric water content, is most preferably containing
Static strength ratio is up to 4.0 or more when water rate.With the increase of moisture content, static strength, which compares, to be significantly reduced, when test specimen approaches saturation,
Static strength ratio no longer changes.Under same moisture content, with the increase of compactness, static strength ratio is in increase tendency.On the whole,
Moisture content is greater than the influence of compactness to the influence of static strength ratio.Due to the soil body strain-stress relation and soil moisture content and
Compactness is closely related.According to the difference of moisture content, static strength can be divided into three typical cases than the variation with volumetric water content
Region: (1) high-intensitive low-water-content region, moisture content is near optimum moisture content 17%, due to the raising of compactness, soil
Body intensity increases sharply with the raising of volumetric water content, and reaches extreme value；(2) has the stable aqueous rate area of some strength
Domain, moisture content increases to 20%~23% at this time, and soil strength is drastically reduced by the extreme value of low-water-content, although in this moisture content
In range, the increase of compactness can cause the raising of soil strength, but amplification is little, and soil strength is with volumetric water content
Increase is not in increaseing or decreasing sharply, but in a stable surge area；(3) low intensive high-moisture percentage
Region, when moisture content is further increased to 26%~29%, soil strength is further decreased as saturated soil intensity, although the soil body is strong
Degree fluctuates less with the raising of volumetric water content, but soil strength is too low.It follows that the tool determined according to indoor triaxial test
The upper limit value in the stable aqueous rate region of standby some strength is 23%, is higher than 6 percentage points of optimum moisture content, and then determine target
The moisture content upper limit is optimum moisture content Wopt+ 6%.
5, the lower limit value of compactness K described in 1 determines according to the following formula (1),
Wherein air factor Va takes 6%；Gs is the specific gravity of soil, and taking 2.72, w is moisture content (%), bankets and rolls after drying
Preceding testing result is 23%, γdmaxFor the maximum dry density (g/cm of soil3), the 1.802gcm known to compaction test results
-3.Above data is substituted into above-mentioned formula, can obtain compactness is 87.3%, takes target compaction degree K=88%.
Modulus of resilience value in table Room 2
Table 2 show the relationship of the areas formerly flooded by the Huanghe River high liquid limit clay modulus of resilience and moisture content, when moisture content 23%, compactness
When 85%, soil body compression modulus is 29.1MPa, 90% soil body compressed coefficient 115.1MPa of compactness, it is seen then that selection K=88%
When spending for target compaction, the compressed coefficient of the soil body is not less than 30MPa.
Fig. 4 show the relationship of the areas formerly flooded by the Huanghe River high liquid limit clay compressed coefficient and moisture content, when moisture content 23%, compactness
When 85%, soil body compressed coefficient 0.18MPa-1, 90% soil body compressed coefficient 0.16MPa of compactness-1, it is seen then that selection K=88%
When spending for target compaction, the compressed coefficient of the soil body is not higher than 0.2MPa-1。
Wherein, the relationship of areas formerly flooded by the Huanghe River high liquid limit clay cohesive strength and volumetric water content, when in stable aqueous rate 20~
23%, when 88% or more compactness, soil body cohesive strength is not less than 100kPa, is such as not less than according to the filling roadbed coefficient of stability
1.3 calculate, and the roadbed raising of operation can reach 18m.
To realize the target moisture content and compactness in 1, propose that the site physical of areas formerly flooded by the Huanghe River high liquid limit clay roadbed rolls
Technique receives the compaction technology in face 1 time, packet using the smooth-wheeled roller static pressure 1 time-cam road roller 4 times-pneumatic-tired rollers that shake by force
Include following steps:
1, the initial aqueous rate banketed is measured, if meeting target moisture content range [optimum moisture content Wopt- 2%, it is optimal to contain
Water rate Wopt+ 6%], it can be directly used for decking and rolling；If initial aqueous rate is more than target moisture content range, needs to pave and turn over
It shines；
2, paving thickness described in 1 is 35cm ± 2cm, and road-mixed machine carries out pulverization process, guarantee earth material without large-scale grume,
Then bull-dozer is flattened, and it is smooth that guarantee rolls working face；
3, process is tedded described in 1 are as follows: 1) excavator ted, slightly put down for the first time, dries 2-3 days；2) excavator
It tedded, slightly put down for the second time, dried 2-3 days；3) five-furrow plough is tedded, and interval time is 1 day/time, to the soil after sunning
Material carries out moisture content detection, and detection cycle is 1 times/day；
4, pave the worst case meteorological conditions for tedding that the time does not include rainfall and temperature is lower than zero degree described in 1；
5, the roller compaction processes to pave after tedding are as follows: 1) progress 20 tonnage smooth-wheeled roller static pressure, round-trip 1 time；2) 20 are carried out
Tonnage cam road roller vibroroller cmpacting, round-trip 4 times；3) finally with 30 tonnage pneumatic-tired rollers covers；
6, Subgrade Compaction detection should be after every layer of Roadbed Soil rolls end, the portion of compactness detection not up to 88%
20 tonnage cam road roller ftercompctions should be carried out by dividing；
7, Subgrade Compaction detects: this bid section is according to T 0111- in " highway earthwork test rule " (JTG E40-2007)
1993 sand replacement methods carry out compactness detection.For the compactness changing rule for being rolled rear subgrade soil every time, often roll one time
The compactness at identical point is detected afterwards, and testing result is summarized as follows.
Gauge pressure solidity and number of rolling relationship
Through testing result it is found that soil compaction degree is up to 92% or more when using above-mentioned compaction technology.Cam road roller
Subgrade soil can be punctured, so that air in soil body escapes, moisture moves up dissipation, and hole compression, soil particle is compacted, and compactness increases
To stable state.Cam road roller meeting disturbed soil surface layer, pneumatic-tired rollers carry out receipts face and roll one time, can effectively promote table
The compactness of layer soil body.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (7)
1. a kind of areas formerly flooded by the Huanghe River high liquid limit clay embankment Con trolling index determines method, which is characterized in that including target moisture content
It is as follows with the determination method of compactness:
Determining the ingredient of areas formerly flooded by the Huanghe River high liquid limit clay, particle composition and physical characteristic meet: silt content accounts for 65.5%~
72.2%, clay content accounts for 22%~36.3%, liquid limit 45%~60%, plastic limit 22%~36%；
Areas formerly flooded by the Huanghe River high liquid limit clay soil sample is prepared through wet process, obtains optimum moisture content W according to modified compaction testoptWith it is corresponding
Maximum dry density γdmax；
Determine the lower limit value of areas formerly flooded by the Huanghe River high liquid limit clay embankment filled soil moisture content:
According to the regulation of " Highway Roadbed Construction Technology specification ", the moisture content lower limit of areas formerly flooded by the Huanghe River high liquid limit clay embankment filled soil is determined
Value is Wopt- 2%；
It determines the upper limit value of areas formerly flooded by the Huanghe River high liquid limit clay embankment filled soil moisture content: different water cut is obtained according to indoor triaxial test
With under compactness state volumetric water content and static strength than relation curve, and then be divided into high-intensitive low-water-content area, tool
The stable aqueous rate area and low intensive high-moisture percentage area of standby some strength, the upper limit value for finally choosing stable aqueous rate area determine
It obtains；
The static strength is than 1/2 for the ratio between deviator stress and confining pressure；The high-intensitive low-water-content area refers to quiet strong
Degree is than the moisture content area greater than 2；The stable aqueous rate area for having some strength refers to static strength ratio between 1~2
Moisture content area；The low intensive high-moisture percentage area refers to static strength than the moisture content area lower than 0.5；
Compactness K is determined using following formula:
Wherein, air factor VaTake 6%, GsFor the specific gravity of soil, w is moisture content, %, γdmaxFor the maximum dry density of soil, g/cm3。
2. determining method as described in claim 1, it is characterised in that: the target moisture content range banketed is [optimal to contain
Water rate Wopt- 2%, optimum moisture content Wopt+ 6%].
3. determining method as described in claim 1, it is characterised in that: the fill compaction degree is not less than 88%.
4. a kind of site physical compaction technology using the areas formerly flooded by the Huanghe River high liquid limit clay embankment for determining method in claim 1,
It is characterized in that: using smooth-wheeled roller static pressure 1 time；Cam road roller shakes by force 4 times；The compaction technology that pneumatic-tired rollers receipts face is 1 time.
5. the site physical compaction technology of high liquid limit clay embankment in areas formerly flooded by the Huanghe River as claimed in claim 4, which is characterized in that specific
Steps are as follows:
Step 1 measures the initial aqueous rate banketed, if meeting target moisture content range [optimum moisture content Wopt- 2%, it is optimal aqueous
Rate Wopt+ 6%], it can be directly used for decking and rolling；If initial aqueous rate be more than target moisture content range, need to pave ted to
Target moisture content range；
Step 2 is rolled: 1. carry out 20 tonnage smooth-wheeled roller static pressure, round-trip 1 time；2. carrying out the vibration of 20 tonnage cam road rollers
It is dynamic to roll, round-trip 4 times；3. last 30 tonnage pneumatic-tired rollers covers；
Step 3 carries out Subgrade Compaction detection after every layer of Roadbed Soil rolls end, compactness detection not up to 88%
Part should carry out 20 tonnage cam road roller ftercompctions.
6. the site physical compaction technology of high liquid limit clay roadbed in areas formerly flooded by the Huanghe River as claimed in claim 5, it is characterised in that:
The paving thickness is 35cm ± 2cm, first carries out pulverization process with road-mixed machine, guarantee earth material is without large-scale grume, then
Bull-dozer is flattened, and it is smooth that guarantee rolls working face.
7. the site physical compaction technology of high liquid limit clay roadbed in areas formerly flooded by the Huanghe River as claimed in claim 5, it is characterised in that:
Described teds process are as follows: 1. excavator ted, slightly put down for the first time, dries 2-3 days；2. excavator carries out second
It teds, slightly put down, dry 2-3 days；3. five-furrow plough is tedded, interval time is 1 day/time, is carried out to the earth material after sunning aqueous
Rate detection, detection cycle are 1 times/day；The unfavorable meteorology for tedding that the time does not include rainfall and temperature is lower than zero degree that paves
Condition.
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| CN108589458B (en) * | 2018-05-05 | 2020-04-21 | 黑龙江省交通科学研究所 | Intensity and stability-based roadbed height control method for highway in seasonal frozen region |
| CN109580420B (en) * | 2018-12-07 | 2021-08-10 | 安徽建工集团控股有限公司 | High liquid limit soil filling water content control method |
| CN110468669A (en) * | 2019-08-21 | 2019-11-19 | 山东大学 | Road high liquid limit clay precipitation and compaction technology |
| CN113215894B (en) * | 2021-04-16 | 2022-02-08 | 中南大学 | Roadbed filler compaction quality control method and system |
| CN113185195B (en) * | 2021-04-28 | 2022-10-18 | 中建五局土木工程有限公司 | Improved composite roadbed filling and preparation method thereof |
| CN114720327B (en) * | 2022-03-08 | 2023-08-29 | 山东高速济青中线公路有限公司 | Evaluation method for evaluating detection reliability of stone-containing roadbed sand filling method |
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| CN102539659B (en) * | 2012-01-09 | 2014-08-06 | 长沙理工大学 | Survey humidification compaction test method for determining swelling soil embankment filling and compaction parameter |
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