CN110346536A - A kind of a wide range of weak soil soil response continuous parameters measuring device - Google Patents
A kind of a wide range of weak soil soil response continuous parameters measuring device Download PDFInfo
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- G—PHYSICS
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- G01N19/00—Investigating materials by mechanical methods
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- 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- 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
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- 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
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Abstract
The invention belongs to the studying technological domains such as ground, geology and environment, provide a kind of a wide range of weak soil soil response continuous parameters measuring device, including shuffle structure main body I, Soil Parameters measuring system II and dragging system III three parts.The mentioned device of the present invention, which breaches the vertical measuring device of traditional single-point, cannot obtain the limitation of the continuous Soil Parameters in rock stratum direction, the laterally continuous over long distances in-site measurement of the parameters such as soil strength, strain softening and the soil body and the effect of works interface friction can be completed by once drawing test, surveyed parameter can be used for instructing the design and construction of the engineerings such as breakwater engineering, benthal oil-gas pipeline, cable, optical cable.Increasing especially as deep-sea oil gas resource exploitation, the design of the job facilities such as submerged pipeline, submarine cable is measured and be applied to submarine soil parameter for the mentioned method of the support present invention and estimation of stability is of great significance.
Description
Technical field
The invention belongs to the studying technological domains such as ground, geology and environment, are related to a kind of a wide range of weak soil soil response ginseng
Number continuous measuring device, the device are particularly suitable for the Soil Parameters investigation before underwater line design and construction.
Background technique
Accurately measure the basis that Soil Parameters are all engineering constructions.Weak soil generally has as a kind of adverse soil mass
Natural moisture content is high, natural void ratio is big, compressibility is high, shearing strength is low, the coefficient of consolidation is small, consolidation time is long, high sensitivity,
The features such as bad hydraulic permeability.Therefore, weak soil place is designed and construction risk is higher.In engineering practice, it realizes to weak soil
Soil response parameter precise measurement be reduce the important channel of engineering risk and optimizing engineering design, and reach rapidly, continuously, it is quasi-
True measurement is not only the important test to experimental provision, even more the main bugbear that is faced of engineering circles.
The acquisition of traditional Soil Parameters mainly obtains wick-like sample by the methods of live gravity core or drill hole sampling, after
And the measurement of soil body relevant parameter is completed by laboratory test.But disturbance and room of this kind of method due to sampling process to the soil body
Limitation existing for interior test method itself is difficult accurately to estimate the Soil Parameters of actual place, this necessarily causes not engineering
The influence of benefit, or even influence engineering safety.In recent years, test in situ device was developed rapidly, cone penetration test
(CPT, CPTU), original position T-bar test, Ball-bar test in situ etc. are widely applied, and test accuracy is also shown
It writes and is promoted, particularly with weak soil place, these experimental provisions embody incomparable superiority.However, these experimental provisions
Be that Soil Parameters are obtained by the vertical single injection of measuring device or circulation injection for some target point, this for
The Soil Parameters measurement of simple target point has good applicability.For the place of a wide range of long range, such experimental rig
Measurement result cannot react Soil Parameters along the variation in stratum direction.It can be from certain journey by the vertical boring point for being arranged more
Soil Parameters are obtained on degree along the variation relation in stratum direction, but thus caused engineering cost and time-consuming increase, so that real
This kind of scheme also becomes unrealistic in the engineering of border.The problem of in conjunction with encountering in current engineering, urgent need, which finds one kind, can be realized
Along the experimental provision of stratum direction measurement Soil Parameters continuous over long distances, the device to the design for building on weak soil sitework and
Estimation of stability has great importance.
Summary of the invention
Aiming at the problem that existing experimental provision can not achieve along stratum direction long range measurements Soil Parameters, the present invention is proposed
A kind of device that can be achieved continuously to measure along stratum direction Soil Parameters.The device is applicable to lake, marsh, river, sea
The laterally consecutive measurement of the Soil Parameters of the bottoms such as ocean soft layer, finally serve breakwater, benthal oil-gas pipeline, cable,
Optical cable etc. relies on the engineering that lateral long range shallow-layer Soil Parameters are designed and construct.Especially with deep-sea oil gas resource
It develops increasing, relies on the mentioned device of the present invention that submerged pipeline, seabed are measured and be applied to submarine soil parameter electric
The design and estimation of stability of the job facilities such as cable have particularly important meaning.
Technical solution of the present invention:
A kind of a wide range of weak soil soil response continuous parameters measuring device, including the measurement of shuffle structure main body I, Soil Parameters
System II and dragging system III three parts；
The shuffle structure bottom main body I is equipped with the groove for installing friction plate, and the top shuffle structure main body I is provided with placement
The space of counterweight lead；The shuffle structure both ends main body I are equipped with support device, make by adjusting support device angle and top counterweight
Shuffle structure main body I sinks to soil layer certain depth；
Soil Parameters measuring system II includes soil strength measuring device, soil body strain softening relation measuring device, friction
Plate, tension-compression sensor and erection support；Soil strength measuring device is fixed on the front end shuffle structure main body I by erection support,
Its installation direction is directed toward the direction of motion；Soil body strain softening relation measuring device is fixed on shuffle structure main body by erection support
The bottom I, installation direction are directed toward the direction of motion；Friction plate is fixed on the recessed of the bottom shuffle structure main body I by tension-compression sensor
In slot and guarantee equal with the shuffle structure bottom main body I；
Dragging system III includes towboat, towing cable terminal device and towing cable；Described towing cable one end and shuffle structure main body I
Front end is connected, and the other end is connected with towing cable terminal device, makes its mobile and transmission measurement in soil layer to actuator
Signal；The towing cable terminal device covers hawser releasing winch and measuring signal acquisition system, to staff to survey
Amount data are constantly analyzed；The towboat should have stable dynamical system, as far as possible with uniform speed in guarantee test
Advance.
The soil strength measuring device is T-bar penetrometer, Ball-bar penetrometer or static penetrometer.
The soil body strain softening relation measuring device is T-bar penetrometer or Ball-bar penetrometer.
The friction plate one side and top surface are connected with the tension-compression sensor of transverse direction and normal direction respectively, other side table
Face is free end.
Apparatus described above can not only obtain the parameters such as soil strength, strain softening and the soil body and structural interface friction,
In embodiment matched sensor data obtained can also be used in other parameters for example overconsolidation ratio, sensitivity, sand phase
To compactness, internal friction angle, the compression modulus of soil, deformation modulus, drainage modulus, foundation bearing capacity, single pile are not held saturation clay
Carry the determination of the parameters such as power and soil liquefaction discrimination.
Beneficial effects of the present invention:
1) the mentioned device of the present invention, which breaches the vertical measuring device of traditional single-point, cannot obtain along the continuous soil body in stratum direction
The limitation of intensive parameter, improve engineering safety and reduce time cost needed for actual measurement of engineering and it is economical at
This.It is laid by the transverse direction of CPT probe 7 and makes its transverse shifting in soil layer, the soil body that can be continuously acquired in trail distance is strong
Spend parameter.
2) the mentioned device of the application present invention is laid by the transverse direction of multiple T-bar probe 9 and moves it laterally in soil layer
It is dynamic, the in-site measurement of strain softening parameter can be completed by once drawing test, it is steady to analysis submarine structure and seabed side slope
It is qualitative that there is important references value.
3) soil body and works interface friction parameter are always the key points and difficulties of marine engineering design and stability analysis,
Using the mentioned device of the present invention, by once pulling test, the in-site measurement of the achievable soil body and works interface friction parameter.
Meanwhile by the horizontal linear laying of multiple friction plates 12, can get friction parameter of the soil body under different level of disruption and its
Attenuation law provides parameter foundation for the research of the Soil-structure interaction model in engineering practice.
4) for mentioned device, it can be achieved that the laterally continuous over long distances of Soil Parameters measures, surveyed parameter is available according to the present invention
In the design and construction for instructing the engineerings such as breakwater, benthal oil-gas pipeline, cable, optical cable.It is opened especially as deep-sea oil gas resource
It sends out increasing, relies on the mentioned device of the present invention that submerged pipeline, submarine cable are measured and be applied to submarine soil parameter
The design and estimation of stability of equal job facilities are of great significance.
Detailed description of the invention
Fig. 1 mentions experimental rig schematic diagram by provided in an embodiment of the present invention.
Fig. 2 is towing gear three-dimensional oblique view provided in an embodiment of the present invention.
Fig. 3 is towing gear side view provided in an embodiment of the present invention.
Fig. 4 is towing gear main view provided in an embodiment of the present invention.
Fig. 5 is device layout figure in towing gear bottom end provided in an embodiment of the present invention.
Fig. 6 is local T-bar penetrometer layout drawing in towing gear bottom end provided in an embodiment of the present invention.
Fig. 7 is local location friction plate measuring principle figure in towing gear bottom end provided in an embodiment of the present invention.
Fig. 8 surveys earth body situation schematic diagram based on CPT probe by provided in an embodiment of the present invention.
Fig. 9 (a) surveys resistance variation schematic diagram based on T-bar probe different location by provided in an embodiment of the present invention.
Fig. 9 (b) is surveyed resistance and is declined relation schematic diagram by provided in an embodiment of the present invention based on the pop one's head in a certain position T-bar.
Figure 10 (a) surveys change in friction force schematic diagram based on friction plate by provided in an embodiment of the present invention.
Figure 10 (b) surveys vertical pressure variation schematic diagram based on friction plate by provided in an embodiment of the present invention.
Figure 10 (c) obtains coefficient of friction variation schematic diagram based on friction plate by provided in an embodiment of the present invention.
Figure 11 (a) obtains shear stress attenuation relation schematic diagram based on friction plate by provided in an embodiment of the present invention.
Figure 11 (b) obtains coefficient of friction attenuation relation schematic diagram based on friction plate by provided in an embodiment of the present invention.
In figure: 1 shuffle structure top plate；2 hollow floors；3 towing cable pull rings；4 counterweight leads；5 dilatory idler wheels；6 fixed screws；
7CPT probe；8CPT erection support；9T-bar probe；10T-bar erection support；11 tension-compression sensors；12 friction plates；13 drag
Ship；14 towing cable terminal devices (cover the equipment such as releasing winch and data acquisition)；15 towing cables (have compared with high-tensile and can pass
Defeated sensor acquires signal).
Specific embodiment
To become apparent from the purposes, technical schemes and advantages of the embodiment of the present invention, below in conjunction with the embodiment of the present invention
In attached drawing technical scheme in the embodiment of the invention is clearly and completely described.Embodiment described herein is this
Invention section embodiment, instead of all the embodiments.Usually the description in attached drawing and the present invention shown are implemented here
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the following drawings is not intended to limit claimed
The scope of the present invention, and be only to indicate selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
It should be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain item exists
It is defined in one attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
The positional relationship of the instructions such as "upper", "lower", "left", "right" in present invention description is side based on the figure
Position and the positional relationship invention product using when the orientation or positional relationship or art technology usually put
The orientation or positional relationship that personnel usually understand, the description being merely for convenience of in the present embodiment, rather than indication or suggestion institute
The equipment and element of finger must have a particular orientation, therefore be not considered as limiting the invention.
In addition, " first ", " second " appeared in the present invention ..., the sequentialities word such as " the tenth ", only convenient for retouching
It states, and should not be understood as indicating or implying relative importance.
Embodiment 1
A kind of a wide range of weak soil soil response continuous parameters measuring device, including the measurement of shuffle structure main body I, Soil Parameters
System II and dragging system III three parts；
Shuffle structure main body I includes shuffle structure top plate 1, hollow floor 2, towing cable pull ring 3, counterweight lead 4, dilatory idler wheel
5 and fixed screw 6；The shuffle structure top plate 1 and hollow floor 2 form shuffle structure main body I external frame, hollow floor
2 front end face is arcwall face, and the bottom surface of hollow floor 2 has multiple grooves, and the two is all made of stainless steel structure；The towing
1 top of structure roof is equipped with hollow structure to apply counterweight lead 4, can arrange in hollow floor 2 and set cable；The dilatory rolling
Totally 2, wheel 5, is laid in 1 two sides of shuffle structure top plate by fixed screw 6, and drawing idler wheel 5 can occur to turn around fixed screw 6
It is dynamic, to control the depth of penetration of hollow floor 2；After dilatory idler wheel 5 is adjusted to specified angle, fixed screw 6 is tightened；It is described
Counterweight lead 4 to change shuffle structure main body I self weight guarantee shuffle structure main body I sink to soil layer certain depth；Described
Towing cable pull ring 3 is laid in 1 front end of shuffle structure top plate, to be connected with external dragging system III, makes shuffle structure main body I
It is at the uniform velocity moved in soil layer；
Soil Parameters measuring system II includes CPT probe 7, CPT erection support 8, T-bar probe 9, T-bar erection support
10, tension-compression sensor 11 and friction plate 12；
The CPT probe 7 is fixed on hollow 2 front end of floor by CPT erection support 8, and installation direction is directed toward movement
Direction；Voltage signal of the CPT probe 7 in transverse movement is acquired in test, is visited according to surveyed voltage signal and intensity CPT
The transformational relation of resistance suffered by first 7 determines resistance suffered by CPT probe 7；Pass through the pass between gained resistance and soil strength again
System obtains the soil strength along direction of motion consecutive variations；
The T-bar erection support 10 is fixed on hollow 2 bottom surface of floor of shuffle structure and lays along same straight line,
For fixing tension-compression sensor 11, it is connected with T-bar on tension-compression sensor 11 and pops one's head in 9, T-bar probe, the 9 direction direction of motion simultaneously
Guarantee that T-bar probe 9 is located along the same line；During device is advanced in the soil body, the same position soil body is by towing gear
The disturbance of the multiple T-bar probes 9 in bottom end；By measuring the survey voltage signal for the tension-compression sensor 11 that T-bar probe 9 is connected,
Obtain the resistance in 9 traveling of T-bar probe；To the same position soil body, i.e. resistance suffered by acquisition T-bar probe 9 is corresponding
Relationship between T-bar 9 numbers of probe of disturbed soil；The accumulation occurred in conjunction with 9 numbers of disturbed soil T-bar probe and the soil body
Relationship between plastic strain then obtains the relationship between resistance and accumulated plastic strain；It is obstructed in conjunction with T-bar probe 9
Relationship between power and soil strength, the final relationship determined between soil strength and accumulated plastic strain, the i.e. soil body should soften
Change relationship；
The friction plate 12 is installed in hollow 2 bottom groove of floor, lower surface and hollow 2 bottom surface phase of floor
It is flat；One side end face of friction plate 12 and upper surface are passed with the tension and compression for laterally and being vertically laid in hollow 2 bottom groove of floor respectively
Sensor 11 is connected, and guarantees that friction plate 12 is not connected with the side end face freedom of tension-compression sensor 11；The towing gear exists
During advancing in the soil body, 11 voltage signal of tension-compression sensor is directly measured and by its transforming relationship between power, acquisition
The frictional force and vertical pressure of the soil body suffered by friction plate 12；For clay, in conjunction with by the same position soil body frictional resistance and
What 12 numbers of relationship and disturbed soil friction plate and the soil body between 12 numbers of friction plate of its corresponding disturbed soil occurred
Relationship between relative displacement, the relationship between the final frictional resistance for obtaining friction plate 12 and accumulation relative displacement；For sand
Property soil, by frictional resistance suffered by same position friction plate 12 and its suffered by vertical pressure relationship, i.e., acquisition friction plate 12 with
Coefficient of friction between the soil body, in conjunction with by 12 numbers of same position disturbed soil friction plate and the soil body generation relative displacement it
Between relationship, it is final to obtain 12 coefficient of friction of friction plate and accumulate the relationship between relative displacement；
Dragging system III includes towboat 13, towing cable terminal device 14 and towing cable 15；Described 15 one end of towing cable and towing cable is drawn
Ring 3 is connected, and the other end is connected with towing cable terminal device 14, moves it in soil layer to actuator and transmits CPT
The measuring signal of probe 7 and sensor 11；The towing cable terminal device 14 covers hawser releasing winch and CPT 7 Hes of probe
The measuring signal acquisition system of tension-compression sensor 11 constantly analyzes measurement data to staff；The towboat
13 should have stable dynamical system, be advanced as far as possible in guarantee test with uniform speed.
Material therefor is identical as 12 material therefor of friction plate between adjacent friction plate 12, and requires between adjacent friction plate 12
Distance is identical as 12 length of friction plate.
Embodiment 2
The present embodiment is a kind of a wide range of weak soil soil response continuous parameters measuring device, experiment dress provided in this embodiment
It sets simple and can be realized the continuous measurement along stratum direction long range Soil Parameters, can be used to serve underwater line, cable
Isostructural design and construction.
Refering to fig. 1,2, the experimental provision provided in this embodiment for continuously measuring weak soil site parameter along stratum direction can lead to
The primary towing gear that laterally pulls is crossed to complete.Towing gear includes shuffle structure top plate 1, hollow floor 2, towing cable pull ring 3, counterweight
Lead 4, fixed screw 6, CPT probe 7, CPT erection support 8, T-bar probe 9, T-bar erection support 10, is drawn dilatory idler wheel 5
Pressure sensor 11 and friction plate 12；Tension-compression sensor 11 respectively with T-bar pop one's head in 9 and T-bar hold-down support 10；CPT probe 7 with
Its erection support 8 is connected；Friction plate 12 is connected with the tension-compression sensor 11 laterally and vertically laid respectively.
In conjunction with attached drawing and technical solution, the present embodiment key step is as follows:
First, assemble towing gear
Refering to Fig. 2 and Fig. 3, shuffle structure top plate 1 and hollow floor 2 are all made of stainless steel structure, can pass through control in test
Preparing weight 4 makes sky floor 2 sink to soil layer certain depth.Towing cable pull ring 3 is installed on 1 front end of shuffle structure top plate, in testing
Towing gear is pulled by towing cable 15.Before 2 CPT probes 7 are connected with its erection support 8 and are fixed on hollow floor 2
End.CPT probe 5 select international standards probe, i.e., probe apex angle be 60 °, floor space 10cm2。
Refering to Fig. 3, Fig. 4 and Fig. 5, T-bar support 10 is laid in hollow 2 bottom end of floor of towing gear and along same straight line cloth
If 8, tension-compression sensor 11 is connected with T-bar support 10 and T-bar probe 9 respectively and is directed toward the towing gear direction of motion.
T-bar 9 sizes of probe select diameter 4cm, the stainless steel cylinder production of length 10cm.
Refering to Fig. 3, Fig. 4, Fig. 5 and Fig. 7,15 friction plates 12 are along the longitudinal uniform cloth in hollow 2 bottom end of floor of towing gear
If 8 friction plates 12 are connected with the tension-compression sensor 11 laterally and vertically laid respectively.It is connected with the friction of tension-compression sensor 11
The friction plate 12 of same size is installed between plate 12 is adjacent, and requires 12 one end of wiping board for freely.12 length of friction plate is 10cm,
Width is 5cm.
Second, equipment performance detects and debugging
After towing gear assembles, by tension and compression CPT probe 7, T-bar probe 9 and friction plate 12 come verificating sensor
The sensitivity and validity of the auxiliary facilities such as signal, towing cable 15 and acquisition equipment 14 are transmitted, passes through towing cable terminal device in test
14 carry out the pilot production of data.After equipment detects complete no problem, prepare to test in next step.
Third, towing gear are thrown to soil layer surface to be measured
By assembled towing gear by gantry crane or other hanging devices it is slow under be put in soil body surface, decentralization process
Middle control lowering velocity, avoids biggish inertia force from damaging equipment.Towing gear is transferred to designated position, under continuing
Put towing cable 15 and make 13 low-speed forward of towboat, control 15 length of towing cable make its angle between mud face it is sufficiently small (general 30 ° with
It is interior).After towing cable 15 reaches specified angle, 14 operating condition of towing cable terminal device is checked, after equipment inspection is errorless, data acquisition
Opening of device.
4th, towing gear laterally to dragging
After test preparation is ready, towing gear, strict control in dragging are dragged along assigned direction using towboat 13
Towboat speed 13 degree and direction, as far as possible guarantee towboat 13 are constantly observed, analyzed and are saved to acquisition data at the uniform velocity to advance.
5th, the recycling of equipment
It is completed wait test, towboat 13 slowly falls back and tightens towing cable 15 simultaneously, is lifted up towing gear, is recycled to towboat
Behind 13 decks, the inspection and storage of equipment are carried out.
6th, the processing of measurement data
After the completion of primary dilatory test, the main Soil Parameters and data analysis process of the mentioned device measurement of the present invention are such as
Under.
1) determination of soil shear strength
The shearing strength of the soil body is as important one of Soil Parameters, the main measurement according to static sounding (CPT) probe 7
As a result it is determined, soil strength calculating process is as follows:
Wherein: QcFor the static point resistance of probe, N；A is the cone floor space of probe, m2；NktFor the coefficient of bearing caoacity of probe,
Between 11~19, general value is 15.0.Mentioned experimental rig and above-mentioned strength calculation method according to the present invention, test
Earth body relationship is as shown in Figure 8 afterwards.
2) determination of soil body strain softening parameter
The calculating of strain softening parameter is mainly popped one's head in 9 pairs according to the T-bar of the hollow 2 bottom end different location of floor of towing gear
11 measurement data of tension-compression sensor answered carries out analysis acquisition, and the resistance in towing gear dragging process of T-bar probe 9 changes feelings
Shown in condition such as Fig. 9 (a).
The strain softening model of the soil body are as follows:
Wherein: su0For the initial strength of the soil body, kPa；δremFor the sensitivity (S of the soil bodyt) inverse；ξ95For soil strength
Accumulated plastic strain value corresponding to reducing by 95%.
Initial strength (the s of the soil bodyu0) using first T-bar probe 9 of the hollow 2 bottom end direction of motion of floor of towing gear
Measurement result is determined, and calculating process is as follows:
Wherein: qT-barFor resistance of the T-bar probe 9 in the soil body in transverse movement；NT-barFor the carrying of T-bar
Force coefficient, between 9.14~11.94, general value is 10.5；D is the diameter for selecting T-bar, m；L is to select in T-bar
The length of T connector, m.
The same position soil body, after 9 disturbance of multiple T-bar probe, resistance attenuation relation is as follows:
Wherein, n is T-bar 9 numbers of probe passed through along direction of motion same position, considers the strain in penetration process
Mean value is generally started counting by 0.25 and is gradually added up according to T-bar 9 numbers of popping one's head in 0.5, i.e., n value be sequentially 0.25,
0.75,1.25 incremental variations are carried out；qnTo start counting resistance suffered by corresponding n-th of T-bar probe 9 along the direction of motion
Value, qinFor the Resistance Value of the T-bar probe 9 of direction of motion front end, qremFor the Resistance Value (resistance of rearmost end T-bar probe 9
Corresponding numerical value, the measurement Resistance Value of generally the last one T-bar when stablizing), N95It is corresponding when for strength reduction 95%
T-bar pop one's head in 9 numbers.After disturbance of a certain position soil body by different number T-bar probe 9, surveyed resistance attenuation is such as
Shown in Fig. 9 (b), N95It can be analyzed and be obtained by the resistance attenuation relation of such as Fig. 9 (b).
Sensitivity (the S of the soil bodyt) can be estimated according to following formula:
ξ95It can be calculate by the following formula,
ξ95=2N95ξT-bar
Wherein ξT-barIt can be calculated according to the following formula,
ξT-bar=0.83log (St)+3.09
3) determination of soil and structural interface friction parameter
Interfacial friction factor between soil and structure by pressure suffered by measurement towing gear bottom end friction plate 12 and rubs
Resistance is wiped to obtain.Soil body friction parameter obtaining step is as follows:
3.1) cohesive soil friction parameter
Since the same position soil body can be by the multiple frictions of its bottom of the device along the dragging process of stratum direction in towing gear
The rubbing action of plate 12, and differentiated friction plate 12 is different to soil disturbance situation, therefore frictional resistance suffered by friction plate 12 can exist
It is apparent different.Frictional resistance suffered by friction plate 12 is obtained by vertical tension-compression sensor 11, along stratum direction in test
Shown in frictional force such as Figure 10 (a), m-th of friction plate 12 shear stress suffered by same position in the soil body is
In formula: Ff,mFor frictional force suffered by analysis m-th of position friction plate 12, N；W is the width of single friction plate 12,
m；L is the length of single friction plate 12, m.
After m 12 rubbing action of friction plate, the friction displacement that the soil body is occurred is
S(m)=mL
By calculating above, the decaying of the soil and structural interface friction parameter (shear stress) that can be obtained sticky soil material is advised
Rule, as shown in Figure 11 (a).
3.2) sandy soil friction parameter
The pressure and frictional resistance that coefficient of friction between the soil body and structure passes through measurement towing gear bottom end friction plate 12
It obtains.During towing, vertical pressure suffered by friction plate 12 is obtained by the measurement of vertical tension-compression sensor 11, is rubbed in test
Shown in vertical pressure situation of change such as Figure 10 (b) suffered by wiping board 12；The drawing that 12 friction of friction plate is laterally laid according to it
11 measurement result of pressure sensor obtains, in test shown in frictional force such as Figure 10 (a).According to Coulomb friction criterion, coefficient of friction can
It is calculate by the following formula.
Wherein: FfFor side-friction suffered by friction plate 12 during towing, N；FNIt is friction plate 12 during towing
Suffered vertical pressure, N.During towing shown in coefficient of friction situation of change such as Figure 10 (c) of different location friction plate 12.
The coefficient of friction of the same position soil body is
Wherein: FN,mFor vertical pressure suffered by analysis m-th of position friction plate 12, N；Obtained the friction coefficient after test
It rubs shown in attenuation relation such as Figure 11 (b) of displacement.
The above is only preferred embodiments of the invention, are not intended to restrict the invention, for those skilled in the art
For, the invention may be variously modified and varied.All any modifications within the ideas and principles of the present invention, made, etc.
With replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of a wide range of weak soil soil response continuous parameters measuring device, which is characterized in that a wide range of weak soil place
Soil Parameters continuous measuring device includes shuffle structure main body I, Soil Parameters measuring system II and dragging system III tri-
Point；
The shuffle structure bottom main body I is equipped with the groove for installing friction plate, and the shuffle structure top main body I, which is equipped with, places counterweight lead
The space of block；The shuffle structure both ends main body I are equipped with support device, tie towing by adjusting support device angle and top counterweight
Structure main body I sinks to soil layer certain depth；
Soil Parameters measuring system II includes soil strength measuring device, soil body strain softening relation measuring device, friction plate, drawing
Pressure sensor and erection support；Soil strength measuring device is fixed on the front end shuffle structure main body I by erection support, installation
It is directed toward the direction of motion in direction；Soil body strain softening relation measuring device is fixed on the bottom shuffle structure main body I by erection support,
Its installation direction is directed toward the towing gear direction of motion；Friction plate is sensed with the tension and compression for being fixed on shuffle structure main body I bottom groove
Device is connected and equal with the shuffle structure bottom main body I；
Dragging system III includes towboat, towing cable terminal device and towing cable；Described towing cable one end and the front end shuffle structure main body I
It is connected, the other end is connected with towing cable terminal device, makes its mobile and transmission measurement signal in soil layer to actuator；
The towing cable terminal device covers hawser releasing winch and measuring signal acquisition system, to staff to measurement data
Constantly analyzed；The towboat should have stable dynamical system, be moved as far as possible in guarantee test with uniform speed
It is dynamic.
2. a wide range of weak soil soil response continuous parameters measuring device according to claim 1, which is characterized in that described
Soil strength measuring device is T-bar penetrometer, Ball-bar penetrometer or static penetrometer.
3. a wide range of weak soil soil response continuous parameters measuring device according to claim 1 or 2, which is characterized in that institute
The soil body strain softening relation measuring device stated is T-bar penetrometer or Ball-bar penetrometer.
4. a wide range of weak soil soil response continuous parameters measuring device according to claim 1 or 2, which is characterized in that institute
The friction plate one side stated and top surface are connected with the tension-compression sensor of transverse direction and normal direction respectively, and another side surface is freely
End.
5. a wide range of weak soil soil response continuous parameters measuring device according to claim 3, which is characterized in that described
Friction plate one side and top surface are connected with the tension-compression sensor of transverse direction and normal direction respectively, and another side is free end.
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