CN106442937B - A kind of novel sea shallow-layer soil strength variation detection system and its appraisal procedure - Google Patents
A kind of novel sea shallow-layer soil strength variation detection system and its appraisal procedure Download PDFInfo
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Abstract
The invention discloses provide a kind of novel sea shallow-layer soil strength variation detection system and its appraisal procedure, including a sounding rod, the lower end of sounding rod is cone structure, and sounding rod is connect with driver, vertical load is applied to sounding rod with driver, is pierced into foundation soil body for sounding rod and power is provided；Multiple dynamometer links are distributed with around sounding rod, dynamometer link is inserted vertically into foundation soil body, multiple pressure sensors is disposed on the dynamometer link, the soil compaction power generated during burying to the periphery soil body to detect sounding rod.Pass through the soil-squeezing action power generated during measurement sounding rod injection foundation soil body to the periphery soil body, assess the Shear Strength Index of the ocean shallow-layer soil body, illustrate the mechanical characteristic of ocean shallow soil, it is embedded in the earth resistance model generated after the soil body under Gravitative Loads to establish pipeline, analyzes the On-bottom stability of submarine pipeline under high temperature and pressure synergy.
Description
Technical field
The present invention relates to the in-situ tests of ocean shallow soil and inspection of the scene of a crime field, relate in particular to a kind of novel sea
Shallow-layer soil strength variation detection system and its appraisal procedure.
Background technique
21 century is the century of ocean.Currently, the sharply expansion of population, environment is asked with the excessive exploitation of land resources
The sight of investment has been transferred to ocean one after another by the worsening of topic, coastal various countries, the world, accelerates exploitation and benefit to ocean
With, and using it to the development ability of ocean as the major criterion for measuring state's Integrate technologies ability.The exploitation of ocean is main
Refer to the exploitation to marine resources and the comprehensive utilization to ocean and its space.For guarantee ocean development engineering it is smooth into
It goes, offshore exploration must be carried out before constructing, the geology composition and soil strength variation in seabed are verified by various exploration means, is opened for ocean
It sends out engineering and the basic data of design is provided, seabed is mainly verified using marine in-situ testing technique in ocean geotechnical engineering field
Soil strength variation.
Currently, submarine pipeline becomes the main means of offshore oil and gas conveying with the rise of Marine oil and gas resource, for
The deeper pipeline of operating depth (is greater than 300m), due to the limitation of sea bottom complex geological conditions and project cost, usually by pipeline
It directly is layed in seabed, under the construction conditions, the sea-bottom shallow soil body is to cause pipeline that whole bend occurs to the effect of contraction of pipeline
Song, the principal element of threat tube On-bottom stability.The naked pipeline for being placed in seabed first under the action of self-weight, generates certain
Sedimentation, is embedded into the soil body, when pipeline is runed, issues heat expansion in the synergy of high temperature and pressure and generates additional stress, by
In the effect of thermal expansion and poisson effect, inner wall of the pipe generates biggish axial compressive force, but since around foundation soil body is to pipeline
Effect of contraction limit pipeline Free Transform, discharge the axial compressive force in pipeline can not because of deformation, with temperature-pressure load
Raising, the axial compressive force in pipeline is built up, when accumulative axial compressive force is greater than pipeline Critical Buckling Loads, pipeline hair
Raw complete buckling, the On-bottom stability of threat tube.Therefore, it in the effectively complete buckling problem of control submarine pipeline, determines
Foundation soil body is of great significance to the restraining force of pipeline.In view of ocean shallow soil to the significance of pipeline On-bottom stability,
Submarine pipeline be laid with early period need to carry out on-site land survey, determine the engineering characteristic of the ocean shallow-layer soil body, it is ensured that the safety of pipeline with
Stability.
Currently, more common marine in-situ testing technique mainly includes static sounding technology (Cone Penetration
Testing-CPT injection technology (mainly including T-bar injection technology and ball-bar injection system etc.)) and is entirely flowed.Static(al)
The sand engineering characteristic that feeler inspection detects is more accurate, but when detecting the engineering characteristic of clay, due to by pore water pressure
Influence, detection result needs be modified, correction result show, detection generation error be sometimes true value obtain several times it
It is more, therefore static sounding is not suitable for the detection of sticky soil strength variation；Although it is strong can to carry out clay shearing resistance for flowing injection system entirely
The determination of degree, but due to being influenced by end effect, its detection result is missed during determining ocean shallow-layer soil strength variation
Difference is larger.
Therefore, it for the mechanical characteristic of the Accurate Determining ocean shallow-layer soil body, is provided effectively for the engineering design of submarine pipeline
A kind of detection system of novel ocean shallow-layer soil strength variation is described in detail in design parameter, this patent.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of detections of novel sea shallow-layer soil strength variation to be
System and its appraisal procedure are commented by the soil-squeezing action power generated during measurement sounding rod injection foundation soil body to the periphery soil body
The Shear Strength Index (consolidation draining intensity) for estimating the ocean shallow-layer soil body, illustrates the mechanical characteristic of ocean shallow soil, to establish pipe
Road is embedded in the earth resistance model generated after the soil body under Gravitative Loads, and submarine pipeline is in place under analysis high temperature and pressure synergy
Stability.
The present invention is achieved by the following technical solutions:
A kind of ocean shallow-layer soil strength variation detection system, including a sounding rod, the lower end of sounding rod are cone structure, feeler inspection
Bar is connect with driver, is applied vertical load to sounding rod with driver, is pierced into foundation soil body for sounding rod and provides power；
Multiple dynamometer links are distributed with around sounding rod, dynamometer link is inserted vertically into foundation soil body, and multiple pressures are disposed on the dynamometer link
Force snesor, the soil compaction power that the periphery soil body is generated during burying to detect sounding rod.
In the above-mentioned technical solutions, the embedding depth of dynamometer link is greater than the depth of penetration of sounding rod.
In the above-mentioned technical solutions, dynamometer link is embedded in estimation range position, rounded distribution, and sounding rod is located in circle
The heart.
In the above-mentioned technical solutions, the dynamometer link connects sound state strain acquirement instrument by data line, moves static strain
Acquisition Instrument is connected to computer, and sound state strain acquirement instrument sends the measurement data of collected dynamometer link to computer, meter
The soil-squeezing action power that the periphery soil body is generated during the sounding rod injection foundation soil body that calculation machine is measured according to dynamometer link, assessment sea
The Shear Strength Index of the foreign shallow-layer soil body, illustrates the mechanical characteristic of ocean shallow soil, is embedded in establishing pipeline under Gravitative Loads
The earth resistance model generated after the soil body analyzes the On-bottom stability of submarine pipeline under high temperature and pressure synergy.
The calculation method of the ocean shallow-layer soil strength variation detection system: foundation soil body is influenced by sounding rod injection
And squeezed, the hole that radius is a is formed, the pressure of hole inner wall is pu, the soil body near hole is by stronger crowded
Pressure acts on and forms plastic zone, and maximum plastic zone radius is R, and the soil body other than maximum plastic zone is to be influenced and formed by sounding rod
Elastic region,
The soil-squeezing action power of dynamometer link measurement, can be calculated, by sounding rod by spherical cavity expansion theory and Quintic system method
Be self-possessed horizontal direction component p of the G with driving load P divided by pressure p obtained by conical side surface areaxAs in the hole after ball expansion
The strong p of wall pressureu；
According to elastic plastic theory, the soil body meets following balance differential equation in ball expansion:
In formula: r is the distance for calculating point and arriving the centre of sphere, σrAnd σθRespectively calculate radial stress a little and circumference stress.
As r=a,
σr=pu (2)
The soil body meets mole-coulomb yield condition in plastic zone:
In formula: c is the cohesive strength of the soil body,For soil body internal friction angle.
Formula (3) are substituted into and solve the differential equation in formula (1), and can be obtained in conjunction with boundary condition formula (2):
Being equal to elastic region volume change using the volume change in hole can obtain plus plastic zone volume change:
In formula: uRFor the displacement of plastic zone boundary radially, R is the radius of soil body maximum plastic zone, and Δ is flat for plastic zone
Equal bulk strain；
Abbreviation formula (5), obtains:
Due to uRHigher order term calculated result is influenced smaller, therefore u is omitted hereR 2、uR 3Equal higher order terms, abbreviation formula (6)
:
It can be obtained by Elasticity knowledge, the displacement components u of plastic zone boundary radiallyRAre as follows:
uR=δ R (8)
In formula:σ0To calculate the first of the point soil body
Beginning stress, μ are the Poisson's ratio of the soil body, and E is elastic modulus of soil body.
The soil body is considered at uniform soil, then
Wherein: Z is the vertical distance for calculating point and arriving the centre of sphere, A1For the primary stress of the soil body at the centre of sphere, γ ', which is that the soil body is floating, to be held
Weight, K0For soil body lateral pressure coefficient；
Formula (8), (9) are substituted into formula (7) and are known:
NoteK3=(1+ Δ) a3, then formula (10) can indicate
Are as follows:
K1R4+K2R3-K3=0 (11)
During being pierced into the soil body, the soil-squeezing action power that dynamometer link is subject to can be measured by dynamometer link and be portalled sounding rod
Cave inner wall pressure puWith the displacement components u of plastic zone boundary radiallyR, according to soil body any point in plastic zone in above-mentioned analytic solutions
The Shear Strength Index c of the land movement value inverse soil body and
The advantages and benefits of the present invention are:
The present invention has filled up the blank of inspection of the scene of a crime ocean shallow-layer soil strength variation, can be effectively applied to naked submarine pipeline of setting and spreads
If the early period of engineering is surveyed, more reliable design parameter is provided for the design of submarine pipeline stability.The present invention is according to measurement soil
The strength characteristics for horizontal soil-squeezing action power (stress and strain) the assessment soil body that body is subject to, effectively reduces soil disturbance to surface layer
The influence of soil strength variation measurement result.
Detailed description of the invention
A kind of detection system schematic diagram of novel ocean shallow-layer soil strength variation of Fig. 1
Fig. 2 sounding rod schematic diagram
Fig. 3 dynamometer link schematic diagram
Fig. 4 is the top view of the computation model of detection system of the invention
Fig. 5 is the side view of the computation model of detection system of the invention
Force diagram during Fig. 6 sounding rod soil compaction
In figure: 1, dynamometer link；2, sounding rod；3, foundation soil body；4, sound state strain acquirement instrument；5, data line；6, it calculates
Machine；7, driver, 8, pressure sensor.
Specific embodiment
Technical solution of the present invention is further illustrated combined with specific embodiments below.
Referring to attached drawing 1, shallow-layer soil strength variation detection system in ocean according to the present invention, including a sounding rod 2, sounding rod
2 lower end is that cone structure (Fig. 2) sounding rod 2 is connect with driver 7, applies vertical load to sounding rod 2 with driver 7,
It is pierced into foundation soil body 3 for sounding rod and power is provided；Multiple dynamometer links 1 are distributed with around sounding rod 2, dynamometer link 1 is inserted vertically into
In foundation soil body 3, the embedding depth of dynamometer link 1 need to be greater than the depth of penetration of sounding rod 2, be disposed on the dynamometer link 1 multiple
Pressure sensor 8 (Fig. 3), the soil compaction power that the periphery soil body is generated during burying to detect sounding rod 2；The dynamometer link
1 connects sound state strain acquirement instrument 4 by data line 5, and sound state strain acquirement instrument 4 is connected to computer 6, and dynamic static strain is adopted
Collect instrument 4 and sends the measurement data of collected dynamometer link 1 to computer 4, the sounding rod that computer 4 is measured according to dynamometer link 1
The soil-squeezing action power generated during injection foundation soil body to the periphery soil body assesses the Shear Strength Index of the ocean shallow-layer soil body
(consolidation draining intensity), illustrates the mechanical characteristic of ocean shallow soil, is generated with establishing after pipeline is embedded in the soil body under Gravitative Loads
Earth resistance model, analyze high temperature and pressure synergy under submarine pipeline On-bottom stability.
The operation principle of the present invention is that:
Referring to attached drawing 4 and attached drawing 5, foundation soil body 3 is influenced by 2 injection of sounding rod and is squeezed, and forming radius is a's
Hole, the pressure of hole inner wall are pu, the soil body near hole is formed plastic zone by stronger squeezing action, maximum
Plastic zone radius is R, and the soil body other than maximum plastic zone is to be influenced by sounding rod and form elastic region, and elastic region and plastic zone are handed over
Pressure size on interface is σ R, and computation model is as shown in Figure 5, wherein l is that dynamometer link is in the length within the scope of plastic zone, A
The point expression dynamometer link point parallel with mud face, B point indicate that dynamometer link is in the borderline point in maximum Plastic flow of soil area, A point and B point
Between dynamometer link be located at ball and expand within the scope of the Plastic flow of soil area to be formed, be that more violent part is influenced by soil compaction effect,
Main level when being also using quasi-static model analysis is to load applying zone.
The soil-squeezing action power of dynamometer link measurement, can be calculated, in soil compaction by spherical cavity expansion theory and Quintic system method
Force diagram in the process is as shown in fig. 6, by sounding rod self weight G and driving load P divided by the water of pressure p obtained by conical side surface area
It puts down to component pxAs the hole inner wall pressure p after ball expansionu。
According to elastic plastic theory, the soil body meets following balance differential equation in ball expansion:
In formula: r is the distance for calculating point and arriving the centre of sphere, σrAnd σθRespectively calculate radial stress a little and circumference stress.
When r=a (a is the hole radius that the soil body is formed in sounding rod penetration process),
σr=pu (2)
The soil body meets mole-coulomb yield condition in plastic zone:
In formula: c is the cohesive strength of the soil body,For soil body internal friction angle.
Formula (3) are substituted into and solve the differential equation in formula (1), and can be obtained in conjunction with boundary condition formula (2):
Being equal to elastic region volume change using the volume change in hole can obtain plus plastic zone volume change:
In formula: uRFor the displacement of plastic zone boundary radially, R is the radius of soil body maximum plastic zone, and Δ is flat for plastic zone
Equal bulk strain.
Abbreviation formula (5), obtains:
Due to uRHigher order term calculated result is influenced smaller, therefore u is omitted hereR 2、uR 3Equal higher order terms, abbreviation formula (6)
:
It can be obtained by Elasticity knowledge, the displacement components u of plastic zone boundary radiallyRAre as follows:
uR=δ R (8)
In formula:σ0To calculate the first of the point soil body
Beginning stress, μ are the Poisson's ratio of the soil body, and E is elastic modulus of soil body.
The soil body is considered at uniform soil, then
Wherein: Z is the vertical distance for calculating point and arriving the centre of sphere, A1For the primary stress of the soil body at the centre of sphere, γ ', which is that the soil body is floating, to be held
Weight, K0For soil body lateral pressure coefficient.
Formula (8), (9) are substituted into formula (7) and are known:
NoteK3=(1+ Δ) a3, then formula (10) can indicate
Are as follows:
K1R4+K2R3-K3=0 (11)
During being pierced into the soil body, the soil-squeezing action power that dynamometer link 1 is subject to can be determined sounding rod 2 by dynamometer link
Hole inner wall pressure puWith the displacement components u of plastic zone boundary radiallyR(uRIt is measured, that is, pressed by the pressure sensor 8 on dynamometer link
The dependent variable of force snesor 8), it can be according to the land movement value inverse soil body of any point in plastic zone of the soil body in above-mentioned analytic solutions
Shear Strength Index c and
This item patent mainly passes through detection sounding rod during the injection soil body, the soil-squeezing action generated to the periphery soil body
Power, and thus obtain the engineering parameter of the ocean shallow-layer soil body, the specific steps are as follows:
Pressure sensor is evenly arranged on dynamometer link, and dynamometer link is embedded in estimation range position, rounded point
Cloth；
It will be in sounding rod injection soil: the injection rate and displacement of driver are set, by sounding rod in dynamometer link arrangement
Between position by 1mm/s rate be pierced into the soil body, guarantee during the sounding rod injection soil body, the soil body be in hull-borne, is pierced into depth
Degree is 5m；Sounding rod generates soil-squeezing action power to ocean foundation soil body during this；
Sounding rod is measured during being pierced into the soil body, the soil-squeezing action power that dynamometer link is subject to, and measurement result is carried out whole
Reason analysis；
Pass through the engineering parameter for the soil-squeezing action power analytic solutions inverse foundation soil body being derived by.
Illustrative description has been done to the present invention above, it should explanation, the case where not departing from core of the invention
Under, any simple deformation, modification or other skilled in the art can not spend the equivalent replacement of creative work equal
Fall into protection scope of the present invention.
Claims (4)
1. a kind of ocean shallow-layer soil strength variation detection system, it is characterised in that: including a sounding rod, the lower end of sounding rod is the conical surface
Structure, sounding rod are connect with driver, are applied vertical load to sounding rod with driver, are pierced into foundation soil body for sounding rod
Power is provided；Multiple dynamometer links are distributed with around sounding rod, dynamometer link is inserted vertically into foundation soil body, is arranged on the dynamometer link
There are multiple pressure sensors, the soil compaction power generated during burying to the periphery soil body to detect sounding rod；
Foundation soil body is influenced by sounding rod injection and is squeezed, and the hole that radius is a is formed, and the pressure of hole inner wall is pu,
The soil body near hole is formed plastic zone by stronger squeezing action, and maximum plastic zone radius is R, maximum plastic zone
The soil body in addition is to be influenced by sounding rod and form elastic region；
Dynamometer link measurement soil-squeezing action power, be calculated by spherical cavity expansion theory and Quintic system method, by sounding rod self weight G with
Drive load P divided by the horizontal direction component p of pressure p obtained by conical side surface areaxAs the hole inner wall pressure after ball expansion
pu；
According to elastic plastic theory, the soil body meets following balance differential equation in ball expansion:
In formula: r is the distance for calculating point and arriving the centre of sphere, σrAnd σθRespectively calculate radial stress a little and circumference stress；
As r=a,
σr=pu (2)
The soil body meets mole-coulomb yield condition in plastic zone:
In formula: c is the cohesive strength of the soil body,For soil body internal friction angle；
Formula (3) are substituted into and solve the differential equation in formula (1), and boundary condition formula (2) is combined to obtain:
It is equal to elastic region volume change using the volume change in hole to obtain plus plastic zone volume change:
In formula: uRFor the displacement of plastic zone boundary radially, R is the radius of soil body maximum plastic zone, and Δ is plastic zone average external volume
Strain；
Abbreviation formula (5), obtains:
Due to uRHigher order term calculated result is influenced smaller, therefore u is omitted hereR 2、uR 3Equal higher order terms, abbreviation formula (6):
It can be obtained by Elasticity knowledge, the displacement components u of plastic zone boundary radiallyRAre as follows:
uR=δ R (8)
In formula:σ0To calculate initially answering for the point soil body
Power, μ are the Poisson's ratio of the soil body, and E is elastic modulus of soil body；
The soil body is considered at uniform soil, then
Wherein: Z is the vertical distance for calculating point and arriving the centre of sphere, A1For the primary stress of the soil body at the centre of sphere, γ ' is soil body buoyant unit weight, K0
For soil body lateral pressure coefficient；
Formula (8), (9) are substituted into formula (7) and are obtained:
NoteK3=(1+ Δ) a3, then formula (10) indicates are as follows:
K1R4+K2R3-K3=0 (11)
During being pierced into the soil body, the soil-squeezing action power that dynamometer link is subject to can be determined in hole sounding rod by dynamometer link
The strong p of wall pressureuWith the displacement components u of plastic zone boundary radiallyR, according to the soil body of soil body any point in plastic zone in above-mentioned analytic solutions
The Shear Strength Index c of the shift value inverse soil body and
2. shallow-layer soil strength variation detection system in ocean according to claim 1, it is characterised in that: the embedding depth of dynamometer link
Greater than the depth of penetration of sounding rod.
3. shallow-layer soil strength variation detection system in ocean according to claim 1, it is characterised in that: dynamometer link is embedded in prediction
Regional location, rounded distribution, sounding rod are located at circular central.
4. shallow-layer soil strength variation detection system in ocean according to claim 1, it is characterised in that: the dynamometer link passes through number
Sound state strain acquirement instrument is connected according to line, sound state strain acquirement instrument is connected to computer, and sound state strain acquirement instrument will acquire
To the measurement data of dynamometer link send computer to.
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| CN109470580B (en) * | 2018-09-26 | 2021-05-11 | 中国石油天然气集团公司 | Method for evaluating cohesive soil strength parameters of different sea areas in China |
| CN110346535B (en) * | 2019-07-01 | 2024-04-12 | 大连理工大学 | Soft soil site soil body parameter long-distance continuous measurement device |
| CN110346536B (en) * | 2019-07-01 | 2024-08-09 | 大连理工大学 | Soil mass parameter continuous measurement device for large-scale soft soil field |
| CN111177944B (en) * | 2020-01-09 | 2022-04-08 | 暨南大学 | A calculation method for buckling propagation pressure of deep-sea pipelines based on plate and shell theory |
| CN114109404B (en) * | 2021-10-12 | 2023-11-14 | 中铁十一局集团有限公司 | Prediction method and system for three-dimensional displacement of soil body caused by quasi-rectangular shield excavation |
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| CN119202471B (en) * | 2024-11-28 | 2025-04-25 | 中国海洋大学 | Deep sea soil body transverse survey data analysis method |
| CN120337680B (en) * | 2025-06-19 | 2025-09-05 | 上海勘测设计研究院有限公司 | A method for constructing an empirical formula for the ultimate embedment depth of a high-holding force anchor group |
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