CN109211669A - The often measuring method that lateral extrusion deforms in consolidation batt ground - Google Patents
The often measuring method that lateral extrusion deforms in consolidation batt ground Download PDFInfo
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- CN109211669A CN109211669A CN201811259119.5A CN201811259119A CN109211669A CN 109211669 A CN109211669 A CN 109211669A CN 201811259119 A CN201811259119 A CN 201811259119A CN 109211669 A CN109211669 A CN 109211669A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to the measuring and calculating technical fields of ground lateral extrusion deformation, disclose a kind of measuring method for often consolidating lateral extrusion deformation in batt ground, determine that each depth in-situ soil Poisson's ratio with confining pressure changing rule, determines Poisson's ratio according to embankment load and upper overburden layer load by in-situ sampling and indoor triaxial test；Pass through formulaDetermine that ground lateral extrusion deforms under slope foot at each layer depth,It is deformed for i-th layer of maximum lateral extrusion, wherein hiFor i-th layer of lift height, RSiFor the percentage of the i-th floor soil decrement relative settlement plate observation in road, i.e., i-th layer native delaminating deposition percentage, B1/2It is the 1/2, ν of roadbed bottom side lengthiFor Poisson's ratio of the i-th layer of soil under present load state, S be sedimentation plate observation station obtain at roadbed center basal plane sedimentation value.The more current calculating method of elasticity theory of results of measuring of the present invention is more accurate, and formula is easy, required parameter is few, adapts to actual requirement of engineering.
Description
Technical field
The present invention relates to the measuring and calculating technical field of ground lateral extrusion deformation, in particular to middle equipressure under a kind of embankment load
Contracting often consolidates the measuring method of soil base lateral extrusion deformation.
Background technique
Middle compression soil foundation bearing capacity is higher, and settlement of foundation is smaller with respect to for weak soil, and distributed areas are extensive, more
Belong to normally consolidated soil (i.e. substantially by geological epoch layer, fully consolidated, i.e., the existing self weight under existing gravity pressure
Pressure is equal to the soil of precosolidation pressure.)
Since ground settles under embankment load, the soil body is synchronous to occur lateral extrusion deformation, such deformation is to slope
Skirt piles at foot, building are affected, and particularly evident in weak soil, research data is more at present；And in middle compression soil
In, such deformation is often ignored, easily brings hidden danger in subsoil for subgrade engineering.
Currently, since ground is heterogeneous, the nonlinear characteristic of anisotropy and stress-strain, current calculating means
Accurate Prediction is difficult to lateral extrusion deformation.In the design process, it is more modeled using finite element and finite difference software
It calculates, but nonetheless, since the accurate value of parameter is difficult, the limitation of the practical soil body problem of elastic-plastic model analysis is also deposited
In biggish error.
In analyzing lateral deformation process, the value of Poisson's ratio ν is vital, middle compression involved for invention
Property the soil body, often empirically take 0.3~0.35, lack practical basis, be affected to result.And in fact, for the soil body
For, during compression concretion, Poisson's ratio is not definite value, its changing rule should be accurately determined by triaxial test.
Summary of the invention
Goal of the invention: aiming at the problems existing in the prior art, the present invention provides one kind and often consolidates side in batt ground
To the measuring method of extrusion deformation, by observation sedimentation based on corresponding loading status Poisson's ratio, pass through specific formulation reckoning pair
The lateral extrusion deformation of sedimentation should be observed, the more current calculating method of elasticity theory of results of measuring is more accurate, and formula is easy, required
Parameter is few, adapts to actual requirement of engineering.
The present invention provides a kind of measuring methods of lateral extrusion deformation in often consolidation batt ground, which is characterized in that
Calculate step are as follows: (one) determine that each depth in-situ soil Poisson's ratio (is enclosed with confining pressure by in-situ sampling and indoor triaxial test
The stress state for pressing the corresponding ground Central Plains position soil body tests the circumference stress that middle finger loads sample, similarly hereinafter.) changing rule, root
Poisson's ratio is determined according to embankment load and upper overburden layer load；(2) ground side under slope foot is determined at each layer depth by following formula
To extrusion deformation:In formula,It is deformed for i-th layer of maximum lateral extrusion, wherein hiIt is i-th
Layer lift height, RSiIt is the hundred of the i-th floor soil decrement relative settlement plate observation in road (i.e. sedimentation plate actual measurement gained total settlement)
Divide rate, i.e., i-th layer native layered soil compression percentages, B1/2It is the 1/2, v of roadbed bottom side lengthiIt is i-th layer of soil in present load
Poisson's ratio under state, S be the sedimentation plate observation station determined by step (1) obtain at roadbed center basal plane sedimentation value.
Preferably, lift height is determined by similar soil thickness, and when similar soil thickness is greater than 2m, then lift height is no more than
2m。
Further, pass through layered soil compression percentages RSiTheoretical correction coefficient delta βR=+3.12%, to determine formula
Middle RSiValue, and then determine that this area often consolidates in stiff clay ground lateral extrusion and deforms.
The utility model has the advantages that the present invention relates in normal consolidation batt ground, the Vertical Settlement measured by settling plate, same to pacing
Calculate the method that ground lateral extrusion deforms under roadbed slope foot.For existing normal consolidation soil base lateral extrusion meter under vertical load
The formula of calculation method is cumbersome, the larger observation together of error many deficiencies such as cost input is higher, use with observe sedimentation with it is corresponding
Based on loading status Poisson's ratio, by specific formulation survey calculation method, the Poisson's ratio obtained with triaxial test is with confining pressure point
Cloth rule, in conjunction with layered soil compression percentages in the normally consolidated soil ground by long-term observation gained Linyi, Qufu area
Experiential modification parameter, the total settlement measured by settling plate, accurately calculates roadbed with the means that empirical theory combines
Each depth maximum lateral deformation under slope foot.The more current calculating method of elasticity theory of results of measuring is more accurate, calculating simplicity,
Required parameter is few, adapts to actual requirement of engineering.
The present invention improves measuring method by a whole set of, in practice of construction observation, is extrapolated by settlement observation result
Ground lateral extrusion amplitude under slope foot；On the one hand rationally determine that lateral extrusion is deformed to instruct to set in the area for having observation experience
Meter calculates monitoring often consolidation foundation soil lateral extrusion amplitude on the other hand by settlement observation in construction in real time.
Detailed description of the invention
Fig. 1 is roadbed-foundation structure and lateral deformation hierarchical solving schematic diagram；
For under roadbed basal plane settles version observation schematic diagram to Fig. 2；
Fig. 3 is foundation soil with Poisson's ratio changing rule exemplary diagram；
Fig. 4 is that foundation soil changes with Poisson's ratio along depth distribution test result；
Fig. 5 is the calculating of compressed in layers percentage and correction result；
Fig. 6 is that measuring method of the present invention and inclinometer measured value compare (DK182+750 section)；
Fig. 7 is that measuring method of the present invention and inclinometer measured value compare (DK183+210 section).
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
Embodiment 1:
1. case project profile
Present case is located in the LQTJ-2 bid section of southern Shandong high-speed rail Linyi to Qufu, LQTJ-2 bid section construction mileage range are as follows:
DK170+061~DK195+438, case calculate section and choose DK182+750, DK183+210 section, regional key horizon are as follows:
Surface layer is mostly clay, silty clay, and hard plastic~hard shape, 2~8m of thickness, part is boulder and cobble soil.The following are impact soil layers on surface layer:
Cohesive soil and sand, gravel, based on land pebble, alluviation thickness is generally 5~30m, and local thickness is more than 50m.Roadbed filling uses A, B
Group filler fills, and roadbed design raising 6.4m, roadbed bottom width B=46m, gradient 1:1.5, phreatic line 4.0m, ground are positive
Often consolidation soil.Road structure signal such as Fig. 1.
2. Poisson's ratio laboratory test measures
Situation is squeezed out to combine settlement observation result to calculate foundation soil body under two sides slope foots, first by obtaining in situ
Undisturbed sample (the following saturated sample of water level line) carries out indoor triaxial test (according to " People's Republic of China's professional standard: soil
Work testing regulations (SL237-1999) ").Depth selection is preferably taken by foundation soil property and represents sample herein, for homogeneity
Desirable 1 group of the every 4m depth of matter soil layer represents sample.According to indoor continuous load triaxial consolidation test result, in this operating condition load
Under state, DK182+750, DK183+210 two can be obtained and test section foundation soil body Poisson's ratio along depth distribution such as Fig. 4.
3. lateral extrusion deformation calculates
Taking and calculating lift height is 2m, substitutes into following formula and solves:
Sedimentation plate (such as Fig. 3) by being embedded in ground basal plane before roadbed filling can measure total settlement before the cut-off of roadbed center is laid a railway track
S=122mm, the 1/2 of roadbed bottom side length are B1/2=23m, according to by existing " Code for design of building " GB 50007-
Laws for criterion delaminating deposition calculates in 2011, and using the theoretical correction coefficient delta β of layered soil compression percentagesR=+3.12%
Do the calculating of algebra corrected parameter.
By taking DK182+750 section as an example, the compression percentages R of each layering of the sectionsiIt is repaired with the distribution and calculating of depth
As shown in Figure 5.
Lateral extrusion deformation maximum value checkout result at each layer slope foot can be obtained after substituting into formula, the above method is calculated
The actual measurement lateral deformation of result and inclinometer compare, two section result of DK182+750, DK183+210 is respectively such as Fig. 6, figure
7。
The characteristics of by Fig. 6, Fig. 7 it is found that due to the deformation of this method layered method lateral extrusion, it ensure that lateral deformation is calculated
Depth, size under the roadbed slope foot that inclinometer is observed ground lateral extrusion deform, using theory count
The method combined with empirical parameter is calculated, the lateral deformation theoretical value in elastic calculation, Elastoplastic Simulation calculate is effectively prevented
With measured value depth, in terms of gross error.
The technical concepts and features of above embodiment only to illustrate the invention, its object is to allow be familiar with technique
People cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent transformation or modification that Spirit Essence is done, should be covered by the protection scope of the present invention.
Claims (3)
1. the measuring method of lateral extrusion deformation in a kind of often consolidation batt ground, which is characterized in that measuring and calculating step are as follows:
(1) determine each depth in-situ soil Poisson's ratio with confining pressure changing rule, root by in-situ sampling and indoor triaxial test
Poisson's ratio is determined according to embankment load and upper overburden layer load；
(2) determine that ground lateral extrusion deforms under slope foot at each layer depth by following formula:
In formula,It is deformed for i-th layer of maximum lateral extrusion, wherein hiFor i-th layer of lift height, RSiFor the i-th floor soil decrement in road
The percentage of relative settlement plate observation, i.e., i-th layer native layered soil compression percentages, B1/2It is the 1/2 of roadbed bottom side length,
νiFor Poisson's ratio of the i-th layer of soil under present load state, S is that the sedimentation plate observation station determined by step (1) obtains in roadbed
Ground basal plane sedimentation value at the heart.
2. the measuring method of lateral extrusion deformation in normal consolidation batt ground according to claim 1, which is characterized in that
Lift height is determined that when similar soil thickness is greater than 2m, then lift height is no more than 2m by similar soil thickness.
3. the measuring method of lateral extrusion deformation, feature exist in normal consolidation batt ground according to claim 1 or 2
In the layered soil compression percentages RSiTheoretical correction coefficient be Δ βR=+3.12%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811259119.5A CN109211669A (en) | 2018-10-26 | 2018-10-26 | The often measuring method that lateral extrusion deforms in consolidation batt ground |
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| CN201811259119.5A CN109211669A (en) | 2018-10-26 | 2018-10-26 | The often measuring method that lateral extrusion deforms in consolidation batt ground |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110567429A (en) * | 2019-09-25 | 2019-12-13 | 辽宁工程技术大学 | Device and method for measuring actual Poisson ratio of foundation soil body under lateral limit stress condition |
| CN111610094A (en) * | 2020-05-29 | 2020-09-01 | 西南交通大学 | Model test device and test method for high-speed railway roadbed passing karez |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110567429A (en) * | 2019-09-25 | 2019-12-13 | 辽宁工程技术大学 | Device and method for measuring actual Poisson ratio of foundation soil body under lateral limit stress condition |
| CN111610094A (en) * | 2020-05-29 | 2020-09-01 | 西南交通大学 | Model test device and test method for high-speed railway roadbed passing karez |
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Application publication date: 20190115 |