CN106643649A - Method and device for measuring deep soil settlement and pore water pressure - Google Patents
Method and device for measuring deep soil settlement and pore water pressure Download PDFInfo
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- CN106643649A CN106643649A CN201611177185.9A CN201611177185A CN106643649A CN 106643649 A CN106643649 A CN 106643649A CN 201611177185 A CN201611177185 A CN 201611177185A CN 106643649 A CN106643649 A CN 106643649A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
- G01C5/04—Hydrostatic levelling, i.e. by flexibly interconnected liquid containers at separated points
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
Disclosed are a method and a device for measuring deep soil settlement and pore water pressure. The device comprises a water permeable head positioned at a measurement point, liquid tubes and pressure sensors for measuring the pressure at the measurement ends of the liquid tubes, wherein the liquid tubes include a first liquid tube and a second liquid tube. The method includes the steps of 1), disposing the water permeable head at the measurement position, and connecting the first liquid tube and the second liquid tube with the pressure sensors respectively; 2), using the pressure sensors for reading pressure values PA and PB at the measurement ends of the first liquid tube and the second liquid tube respectively, or a pressure difference Pdifference between the two tubes and a pressure value Pc of another liquid tube; 3), computing a measurement point height and the pore water pressure at the measurement point.
Description
Technical field
The invention belongs to ground monitoring field, more particularly, to a kind of soil body deep settlement and pore water pressure measurement device
And measuring method.
Background technology
One of concern point, is also to apply during foundation deformation is process of construction under building load effect in civil engineering construction
One of key index of industry control, especially on the soft soil foundation during the Traffic Engineering Construction such as highway, high-speed railway, sinks
Drop problem usually directly controls the service level of the construction speed of engineering and operation phase road.Therefore, it is the sedimentation of control roadbed,
Instruct the construction of building on roadbed, it is necessary to carry out dynamic monitoring to architecture construction and using the settlement of foundation of process, instruct
Work progress.
Mainly deep settlement of foundation deformation observation is carried out using magnet ring type laminated settlement meter in construction process at present.Often
Delaminating deposition system is made up of magnet ring, protection pipe, detecting head, indicator etc..Generally, should set in every layer soil body
A magnet ring is put, during the soil body deforms, soil layer and magnet ring synchronously sink or resilience；During measurement, work as detection
Head reaches magnet ring position, and the sounder of reception system will send continuously buzzer, now read and write out steel ruler cable and exist
Depth dimensions at the mouth of pipe, by detecting head and indicator magnet ring position is measured, and then obtains the shift value of magnet ring, most
Sedimentation, the bounce situations on stratum are obtained eventually.When laminated settlement meter is installed, need first to drill in soil, then magnet ring is imbedded in hole
The position for pre-setting, and inject between delaminating deposition test tube and hole wall in hole by caulking compounds such as bentonite, fine sand, cement
Space tamp.There are problems that using the measurement ground deep layer deformation of magnet ring type laminated settlement meter following：
1) usually can not be slidably due to the obstruction of sand grains etc. between magnet ring and conduit, it is impossible to real reflection ground
The deep layer deformation of base, causes to measure failure；
2) accuracy of reading and the precision of measurement are decided by the original position for how judging to pronounce or indicating, this and operation
The proficiency level of person is relevant；
3) in the pavement construction phase in later stage and after being open to traffic carry out that the measurement of deep settlement cannot be carried out in traffic engineering；
4) layered cylinderses for measurement must vertically upward stretch out earth's surface, be easily damaged in construction；
5) measurement tasks cannot be carried out during poor weather, and test job is affected larger by external environment.
At present construction Pore Pressure is typically adopted and directly reads pressure value in the embedded pressure transducer of point position
Mode.Shortcoming is：
1) cannot reclaim after pressure transducer embedment；
2) pressure transducer and cable are chronically in subsoil water easily because sensor or cable are intake and cannot be used；
3) cannot repair substantially after damaging, it is difficult in maintenance.
The content of the invention
In order to overcome the shortcomings of that existing soil body deep settlement and pore water pressure e measurement technology are present, the present invention provides a kind of
It is with low cost, be easy to a kind of soil body deep settlement and pore water pressure measurement device and the measuring method constructing and safeguard.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of soil body deep settlement and pore water pressure measurement device, including the permeable head at the measuring point, liquid line and
For measuring the pressure transducer of the pressure of the measurement end of liquid line, the liquid line includes first liquid pipe and second liquid
Pipe, the liquid unit weight in the first liquid pipe is different from the liquid unit weight in the second liquid pipe, the first liquid pipe
Measuring point end fluid pressure in the permeable head, in the first liquid pipe is respectively positioned on the measuring point end of the second liquid pipe
Fluid pressure balanced surface in balanced surface, the second liquid pipe is on same position with measuring point, the first liquid pipe
Measurement end be connected with the pressure transducer respectively with the measurement end of the second liquid pipe.
Further, the pressure transducer is provided with two, respectively the first pressure transducer and the second pressure transducer,
The measurement end of the first liquid pipe is connected with first pressure transducer, the measurement end of the second liquid pipe and described
Two pressure transducers connect.
The measuring method that a kind of soil body deep settlement and pore water pressure measurement device are realized, the measuring method include with
Lower step：
1) permeable head is arranged at measuring point first, and by the measurement end of first liquid pipe and the measurement end of second liquid pipe
It is connected with pressure transducer respectively；
2) pressure transducer reads respectively pressure values P of the measurement end of first liquid pipe and the measurement end of second liquid pipeA
And PB；
3) pore water pressure at measuring point elevation and measuring point is calculated：
3.1) following formula can be obtained according to the pressure balance principle at measuring point：
PA+hThe discrepancy in elevation×γA=PB+hThe discrepancy in elevation×γB； (1)
γ in formulaA、γBRespectively in first liquid pipe in the unit weight and second liquid pipe of liquid liquid unit weight, unit is
N/m3；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between pressure transducer, unit is m；PA、PBUnit is Pa；
Above formula can be converted into hThe discrepancy in elevation=(PA-PB)/(γB-γA)； (2)
The pressure differential of note first liquid pipe and second liquid pipe measurement end is PDifferenceThen have：
PDifference=PA-PB (3)
hThe discrepancy in elevation=PDifference/(γB-γA)； (4)
In known pressure transducer elevation HSensorUnder conditions of can calculate measuring point elevation：
HMeasuring point=HSensor-hThe discrepancy in elevation； (5)
Analysis HMeasuring pointChange in value can just learn the sedimentation situation of measuring point；
3.2) pore water pressure is at measuring point：
PMeasuring point=PA+hThe discrepancy in elevation×γAOr PMeasuring point=PB+hThe discrepancy in elevation×γB； (6)
In formula, γA、γBRespectively in first liquid pipe in the unit weight and second liquid pipe of liquid liquid unit weight, unit
For N/m3；PA、PBRespectively pressure values of the pressure transducer to the measurement end of the measurement end and second liquid pipe of first liquid pipe,
Unit is Pa；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between pressure transducer, unit is m.
A kind of soil body deep settlement and pore water pressure measurement device, including permeable head, first liquid at measuring point
Pipe and second liquid pipe, for measuring between first liquid pipe and second liquid pipe the differential pressure pickup of pressure difference and for measuring
In the pressure transducer of the pressure of the measurement end of liquid line, the liquid unit weight in the first liquid pipe and the second liquid pipe
Liquid unit weight it is different, the measuring point end of the first liquid pipe is respectively positioned on the permeable head with the measuring point end of the second liquid pipe
Interior, the measurement end of the measurement end of the first liquid pipe and the second liquid pipe is connected respectively with the differential pressure pickup, institute
The measurement of the one of liquid line in the 3rd liquid line for state pressure transducer and first liquid pipe, second liquid pipe, separately setting
End connection, it is the fluid pressure balanced surface in fluid pressure balanced surface, the second liquid pipe in the first liquid pipe, described
Fluid pressure balanced surface in 3rd liquid line is on same position with measuring point.
Further, the measuring point end of the 3rd liquid line is located in the permeable head.
The measuring method that a kind of soil body deep settlement and pore water pressure measurement device are realized, the measuring method include with
Lower step：
1) permeable head is arranged at measuring point first, and by the measurement end of first liquid pipe and the measurement end of second liquid pipe
It is connected with differential pressure pickup respectively, while with pressure transducer and first liquid pipe, second liquid pipe, the 3rd liquid line for separately setting
In one of liquid line measurement end connection；
2) differential pressure pickup reads the pressure difference P of the measurement end of the measurement end and second liquid pipe of first liquid pipeDifference, pressure
The measurement end of the one of liquid line in sensor reading first liquid pipe, second liquid pipe, the 3rd liquid line for separately setting
Pressure Pc；
3) pore water pressure at measuring point elevation and measuring point is calculated：
3.1) following formula can be obtained according to the pressure balance principle at measuring point：
PDifference=hThe discrepancy in elevation×γB-hThe discrepancy in elevation×γA； (7)
γ in formulaA、γBRespectively in first liquid pipe in the unit weight and second liquid pipe of liquid liquid unit weight, unit is
N/m3；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between differential pressure pickup, unit is m；PDifferenceUnit is Pa；
Above formula can be converted into hThe discrepancy in elevation=PDifference/(γB-γA)； (4)
In known pressure differential sensor elevation HSensorUnder conditions of can calculate measuring point elevation：
HMeasuring point=HSensor-hThe discrepancy in elevation； (5)
Analysis HMeasuring pointChange in value can just learn the sedimentation situation of measuring point；
3.2) pore water pressure is at measuring point：
PMeasuring point=Pc+hThe discrepancy in elevation×γC (8)
In formula, γCIt is the unit weight of liquid in the liquid line being connected with pressure transducer；PcFor pressure transducer measured value, list
Position is Pa；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between differential pressure pickup, unit is m.
Beneficial effects of the present invention are mainly manifested in：It is with low cost, be easy to construct and safeguard, go for all kinds of complexity
The settlement observation of ground and pore water pressure are observed, and the working strength of site operation personnel can be greatly reduced, in engineering practice
In have larger using value；It is specific as follows：
1) two Monitoring Data are obtained by a kind of method, reduces and install and maintenance workload；
2) the original expensive sedimentation mark for needing to bury, sedimentation be instead of with relatively cheap connection liquid line much
The materials such as pipe, pore pressure cable, can also reduce the embedded workload of drilling, so as to cost-effective；
3) because liquid line is flexible material, compare rigid sedimentation pipe and sedimentation mark is more convenient for drawing and is protected, have
The higher suitability and practicality；
4) the soil layer layered settlement observation for carrying out that the phase is runed after road surface is open to traffic outside runway can be drawn；
5) underground inlet part can substantially reduce fault rate to be not required to be powered and simple structure in practical application；Pressure
Force transducer is placed on earth's surface or near surface, it is easy to maintenance and replacing, improves monitoring fraction；
6) most equipment and material in addition to permeable head and liquid line can also be reclaimed when monitoring task is completed, is entered
One step reduces cost.
Description of the drawings
Fig. 1 is the structural representation of a kind of soil body deep settlement and pore water pressure measurement device.
Specific embodiment
Below in conjunction with the accompanying drawings the invention will be further described.
With reference to Fig. 1, a kind of soil body deep settlement and pore water pressure measurement device, including permeable 1 at measuring point,
Liquid line and the pressure transducer for measuring the pressure of the measurement end of liquid line, the liquid line includes the He of first liquid pipe 2
Second liquid pipe 3, the liquid unit weight in the first liquid pipe 2 is different from the liquid unit weight in the second liquid pipe 3, described
The measuring point end of first liquid pipe 2 is respectively positioned in the permeable head with the measuring point end of the second liquid pipe 3, the first liquid pipe
The fluid pressure balanced surface in fluid pressure balanced surface, the second liquid pipe 3 in 2 is on same position with measuring point,
The measurement end of the first liquid pipe 2 is connected respectively with the measurement end of the second liquid pipe 3 with the pressure transducer 4.
Further, the pressure transducer is provided with two, respectively the first pressure transducer and the second pressure transducer,
The measurement end of the first liquid pipe 2 is connected with first pressure transducer, the measurement end of the second liquid pipe 3 with it is described
Second pressure transducer connects.First pressure transducer be used for measure first liquid pipe 2 measurement end liquid pressure, second
Pressure transducer is used for the pressure of the measurement end liquid for measuring second liquid pipe 3.First pressure transducer is used for measurement first
The pressure of the measurement end liquid of liquid line 2, the second pressure transducer is used for the pressure of the measurement end liquid for measuring second liquid pipe 3
By force.
The measuring method that a kind of soil body deep settlement and pore water pressure measurement device are realized, the measuring method include with
Lower step：
1) permeable 1 is arranged at measuring point first, and by the survey of the measurement end of first liquid pipe 2 and second liquid pipe 3
Amount end is connected respectively with pressure transducer 4；
2) pressure transducer 4 reads respectively the pressure values of the measurement end of the measurement end and second liquid pipe 3 of first liquid pipe 2
PAAnd PB；
3) pore water pressure at measuring point elevation and measuring point is calculated：
3.1) following formula can be obtained according to the pressure balance principle at measuring point：
PA+hThe discrepancy in elevation×γA=PB+hThe discrepancy in elevation×γB； (1)
γ in formulaA、γBRespectively in first liquid pipe in the unit weight and second liquid pipe of liquid liquid unit weight, unit is
N/m3；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between pressure transducer, unit is m；PA、PBUnit is Pa；
Above formula can be converted into hThe discrepancy in elevation=(PA-PB)/(γB-γA)； (2)
The pressure differential of note first liquid pipe and second liquid pipe measurement end is PDifferenceThen have：
PDifference=PA-PB (3)
hThe discrepancy in elevation=PDifference/(γB-γA)； (4)
In known pressure transducer elevation HSensorUnder conditions of can calculate measuring point elevation：
HMeasuring point=HSensor-hThe discrepancy in elevation； (5)
Analysis HMeasuring pointChange in value can just learn the sedimentation situation of measuring point；
3.2) pore water pressure is at measuring point：
PMeasuring point=PA+hThe discrepancy in elevation×γAOr PMeasuring point=PB+hThe discrepancy in elevation×γB； (6)
In formula, γA、γBRespectively in first liquid pipe in the unit weight and second liquid pipe of liquid liquid unit weight, unit
For N/m3；
PA、PBRespectively pressure values of the pressure transducer to the measurement end of the measurement end and second liquid pipe of first liquid pipe,
Unit is Pa；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between pressure transducer, unit is m.
A kind of soil body deep settlement and pore water pressure measurement device, including permeable head, first liquid at measuring point
Pipe and second liquid pipe, for measuring between first liquid pipe and second liquid pipe the differential pressure pickup of pressure difference and for measuring
In the pressure transducer of the pressure of the measurement end of liquid line, the liquid unit weight in the first liquid pipe and the second liquid pipe
Liquid unit weight it is different, the measuring point end of the first liquid pipe is respectively positioned on the permeable head with the measuring point end of the second liquid pipe
Interior, the measurement end of the measurement end of the first liquid pipe and the second liquid pipe is connected respectively with the differential pressure pickup, institute
The measurement of the one of liquid line in the 3rd liquid line for state pressure transducer and first liquid pipe, second liquid pipe, separately setting
End connection, it is the fluid pressure balanced surface in fluid pressure balanced surface, the second liquid pipe in the first liquid pipe, described
Fluid pressure balanced surface in 3rd liquid line is on same position with measuring point.
Further, the measuring point end of the 3rd liquid line is located in the permeable head.
The measuring method that a kind of soil body deep settlement and pore water pressure measurement device are realized, the measuring method include with
Lower step：
1) permeable head is arranged at measuring point first, and by the measurement end of first liquid pipe and the measurement end of second liquid pipe
It is connected with differential pressure pickup respectively, while with pressure transducer and first liquid pipe, second liquid pipe, the 3rd liquid line for separately setting
In one of liquid line measurement end connection；
2) differential pressure pickup reads the pressure difference P of the measurement end of the measurement end and second liquid pipe of first liquid pipeDifference, pressure
The measurement end of the one of liquid line in sensor reading first liquid pipe, second liquid pipe, the 3rd liquid line for separately setting
Pressure Pc；
3) pore water pressure at measuring point elevation and measuring point is calculated：
3.1) following formula can be obtained according to the pressure balance principle at measuring point：
PDifference=hThe discrepancy in elevation×γB-hThe discrepancy in elevation×γA； (7)
γ in formulaA、γBRespectively in first liquid pipe in the unit weight and second liquid pipe of liquid liquid unit weight, unit is
N/m3；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between differential pressure pickup, unit is m；PDifferenceUnit is Pa；
Above formula can be converted into hThe discrepancy in elevation=PDifference/(γB-γA)； (4)
In known pressure differential sensor elevation HSensorUnder conditions of can calculate measuring point elevation：
HMeasuring point=HSensor-hThe discrepancy in elevation； (5)
Analysis HMeasuring pointChange in value can just learn the sedimentation situation of measuring point；
3.2) pore water pressure is at measuring point：
PMeasuring point=Pc+hThe discrepancy in elevation×γc (8)
In formula, γcIt is the unit weight of liquid in the liquid line being connected with pressure transducer, unit is N/m3；PcFor pressure sensing
Device measured value, unit is Pa；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between differential pressure pickup, unit is m.
Certainly, liquid line can also arrange two or more, such as arrange three, four be used for it is standby, or for carrying out
Calibration.
In the present embodiment, pressure transducer is arranged on the position of easy care；Described liquid line is referred to full of same liquid
Liquid line, i.e., the liquid in liquid line is from the pressure balance face at measuring point end until the sensor measuring surface of measurement end is continuous
It is full of.
The present invention design principle be：Soil body deep settlement and soil body pore water are measured by pressure balance principle indirectly
Pressure, specially：
Pressure is acted on first liquid pipe 2 and is located at thoroughly by the pore water pressure at measuring point through permeable 1 at this
Measuring point end 21 and second liquid pipe 3 in head is located at the measuring point end 31 in permeable head, and pressure is passed respectively by two liquid lines
To the pressure transducer 4 of measurement end, pressure transducer reads respectively first liquid pipe 2 and the measurement end 22 and 32 of second liquid pipe 3
Pressure values PAAnd PB；By to PA、PB, liquid unit weight γ in first liquid pipeAWith the liquid unit weight γ in second liquid pipeB
With the pressure balance formula at measuring point head, it can be deduced that discrepancy in elevation H at measuring point and pressure transducer betweenThe discrepancy in elevation, by measuring pressure
The elevation of sensor can extrapolate the elevation at measuring point and sedimentation situation；By pressure value PA、γA、HThe discrepancy in elevation(or PB、γB、
HThe discrepancy in elevation) pore water pressure intensity values P at measuring point can be calculated using communicating pipe pressure balance principleMeasuring point；The method installs simple,
Easy to operate, strong applicability, it is easy to safeguard can effectively improve measurement fraction and reduces cost.
Example one：
Scheme adopts following device：First liquid pipe, second liquid pipe, permeable head and the survey of first liquid pipe can be measured
The pressure transducer of the measurement end pressure of amount end and second liquid pipe, the built-in kerosene kerosene unit weight of first liquid pipe is γA=
8000N/m3；The built-in water of second liquid pipe, water capacity weight is γB=10000N/m3.On October 5th, 2016 measures PA=
121000Pa、PB=102000Pa, sensor elevation are 23.365m；
On October 15th, 2016 measures PA=117048Pa, PB=98600Pa, sensor elevation are 23.298m；.
Calculate measuring point elevation and pore water pressure is：
On October 5th, 2016：
hThe discrepancy in elevation=(PA-PB)/(γB-γA)
=(121000-102000)/(10000-8000)=9.500m
Measuring point elevation HMeasuring point=23.365-9.5=13.865m
The pore water pressure P of measuring pointMeasuring point=PA+hThe discrepancy in elevation×γA
=121000+9.5 × 8000=197000Pa.
On October 15th, 2016：
hThe discrepancy in elevation=(PA-PB)/(γB-γA)
=(117048-98000)/(10000-8000)=9.524m
Measuring point elevation HMeasuring point=23.298-9.524=13.774m
Measuring point pore water pressure PMeasuring point=PA+hThe discrepancy in elevation×γA
=117048+9.524 × 8000=193240Pa.
During -2016 years on the 5th October 15 October in 2016
Settling amount=13.865-13.774=0.091m.
Example two：
Scheme adopts following device：First liquid pipe, second liquid pipe, the 3rd liquid line, permeable head, for measurement first
The measurement end of liquid line is with the differential pressure pickup of the pressure difference of the measurement end of second liquid pipe and for measuring the 3rd liquid line
The pressure transducer of the pressure of measurement end, the elevation of differential pressure pickup as the elevation of pressure transducer, in first liquid pipe
Coaling oil, kerosene unit weight is γA=8000N/m3；The built-in water of second liquid pipe, water capacity weight is γB=10000N/m3；3rd liquid
The built-in water of body pipe, water capacity weight is γC=10000N/m3.On October 5th, 2016 measures the pressure of first liquid pipe and second liquid pipe
Strong poor PDifferencePressure values P of=15260Pa, the 3rd liquid linec=99880Pa, sensor elevation are 23.400m；In October, 2016
Measure within 15th the pressure difference P of first liquid pipe and second liquid pipeDifferencePressure values P of=15342Pa, the 3rd liquid linec=
97630Pa, sensor elevation are 23.335m.
Calculate measuring point elevation and pore water pressure is：
On October 5th, 2016：
hThe discrepancy in elevation=PDifference/(γB-γA)=15260/ (10000-8000)=7.630m
Measuring point elevation HMeasuring point=23.400-7.630=15.770m
Measuring point pore water pressure PMeasuring point=Pc+hThe discrepancy in elevation×γC
=99880+7.63 × 10000=176180Pa.
On October 15th, 2016：
hThe discrepancy in elevation=PDifference/(γB-γA)
=15342/ (10000-8000)=7.671m
Measuring point elevation HMeasuring point=23.335-7.671=15.664m
Measuring point pore water pressure PMeasuring point=Pc+hThe discrepancy in elevation×γC
=97630+7.671 × 10000=174340Pa.
During -2016 years on the 5th October 15 October in 2016
Period settling amount=15.770-15.664=0.106m.
Claims (6)
1. a kind of soil body deep settlement and pore water pressure measurement device, it is characterised in that：Including the permeable head at the measuring point,
Liquid line and the pressure transducer for measuring the pressure of the measurement end of liquid line, the liquid line includes first liquid pipe and the
Two liquid lines, the liquid unit weight in the first liquid pipe is different from the liquid unit weight in the second liquid pipe, and described first
The measuring point end of liquid line is respectively positioned on the liquid in the permeable head, in the first liquid pipe with the measuring point end of the second liquid pipe
Fluid pressure balanced surface in body pressure balance face, the second liquid pipe is on same position with measuring point, and described first
The measurement end of liquid line is connected respectively with the measurement end of the second liquid pipe with the pressure transducer.
2. a kind of soil body deep settlement and pore water pressure measurement device, it is characterised in that：Including the permeable head at the measuring point,
First liquid pipe and second liquid pipe, for measure between first liquid pipe and second liquid pipe the differential pressure pickup of pressure difference and
For measuring the pressure transducer of the pressure of the measurement end of liquid line, the liquid unit weight in the first liquid pipe and described second
Liquid unit weight in liquid line is different, and the measuring point end of the first liquid pipe is respectively positioned on institute with the measuring point end of the second liquid pipe
State in permeable head, the measurement end of the measurement end of the first liquid pipe and the second liquid pipe respectively with the differential pressure pickup
One of liquid line in connection, the pressure transducer and first liquid pipe, second liquid pipe, the 3rd liquid line for separately setting
Measurement end connection, in the fluid pressure balanced surface, the second liquid pipe in the first liquid pipe fluid pressure balance
Fluid pressure balanced surface in face, the 3rd liquid line is on same position with measuring point.
3. a kind of soil body deep settlement as claimed in claim 1 and pore water pressure measurement device, it is characterised in that：The pressure
Strong sensor is provided with two, respectively the first pressure transducer and the second pressure transducer, the measurement of the first liquid pipe
End is connected with first pressure transducer, and the measurement end of the second liquid pipe is connected with second pressure transducer.
4. a kind of soil body deep settlement as claimed in claim 2 and pore water pressure measurement device, it is characterised in that：Described
The measuring point end of three liquid lines is located in the permeable head.
5. a kind of measuring method realized with soil body deep settlement as claimed in claim 1 and pore water pressure measurement device,
It is characterized in that：The measuring method is comprised the following steps：
1) permeable head is arranged at measuring point first, and the measurement end of the measurement end of first liquid pipe and second liquid pipe is distinguished
It is connected with pressure transducer；
2) pressure transducer reads respectively pressure values P of the measurement end of first liquid pipe and the measurement end of second liquid pipeAAnd PB；
3) pore water pressure at measuring point elevation and measuring point is calculated：
3.1) following formula can be obtained according to the pressure balance principle at measuring point：
PA+hThe discrepancy in elevation×γA=PB+hThe discrepancy in elevation×γB； (1)
γ in formulaA、γBRespectively in first liquid pipe in the unit weight and second liquid pipe of liquid liquid unit weight, unit is N/
m3；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between pressure transducer, unit is m；PA、PBUnit is Pa；
Above formula can be converted into hThe discrepancy in elevation=(PA-PB)/(γB-γA)； (2)
The measurement end of note first liquid pipe and the pressure differential of second liquid pipe measurement end are PDifferenceThen have：
PDifference=PA-PB (3)
hThe discrepancy in elevation=PDifference/(γB-γA)； (4)
In known pressure transducer elevation HSensorUnder conditions of can calculate measuring point elevation：
HMeasuring point=HSensor-hThe discrepancy in elevation； (5)
Analysis HMeasuring pointChange in value can just learn the sedimentation situation of measuring point；
3.2) pore water pressure is at measuring point：
PMeasuring point=PA+hThe discrepancy in elevation×γAOr PMeasuring point=PB+hThe discrepancy in elevation×γB； (6)
In formula, γA、γBRespectively in first liquid pipe in the unit weight and second liquid pipe of liquid liquid unit weight, unit is N/
m3；
PA、PBRespectively pressure values of the pressure transducer to the measurement end of the measurement end and second liquid pipe of first liquid pipe, unit
For Pa；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between pressure transducer, unit is m.
6. a kind of measuring method realized with soil body deep settlement as claimed in claim 2 and pore water pressure measurement device,
It is characterized in that：The measuring method is comprised the following steps：
1) permeable head is arranged at measuring point first, and the measurement end of the measurement end of first liquid pipe and second liquid pipe is distinguished
It is connected with differential pressure pickup, while with pressure transducer and first liquid pipe, second liquid pipe, the 3rd liquid line for separately setting
The measurement end connection of one of liquid line；
2) differential pressure pickup reads the pressure difference P of the measurement end of the measurement end and second liquid pipe of first liquid pipeDifference, pressure sensing
The pressure of the measurement end of the one of liquid line in device reading first liquid pipe, second liquid pipe, the 3rd liquid line for separately setting
Pc；
3) pore water pressure at measuring point elevation and measuring point is calculated：
3.1) following formula can be obtained according to the pressure balance principle at measuring point：
PDifference=hThe discrepancy in elevation×γB-hThe discrepancy in elevation×γA； (7)
γ in formulaA、γBRespectively in first liquid pipe in the unit weight and second liquid pipe of liquid liquid unit weight, unit is N/
m3；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between differential pressure pickup, unit is m；PDifferenceUnit is Pa；
Above formula can be converted into hThe discrepancy in elevation=PDifference/(γB-γA)； (4)
In known pressure differential sensor elevation HSensorUnder conditions of can calculate measuring point elevation：
HMeasuring point=HSensor-hThe discrepancy in elevation； (5)
Analysis HMeasuring pointChange in value can just learn the sedimentation situation of measuring point；
3.2) pore water pressure is at measuring point：
PMeasuring point=Pc+hThe discrepancy in elevation×γC (8)
In formula, γCIt is the unit weight of liquid in the liquid line being connected with pressure transducer, unit is N/m3；PcFor pressure transducer survey
Value, unit is Pa；hThe discrepancy in elevationFor measuring point to the discrepancy in elevation between differential pressure pickup, unit is m.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108001459A (en) * | 2017-12-08 | 2018-05-08 | 杭州久智自动化技术有限公司 | Railcar discrepancy station structure |
| CN109029346A (en) * | 2018-08-15 | 2018-12-18 | 浙江广川工程咨询有限公司 | Osmotic pressure and integrated monitoring device and measurement method are settled in a kind of soft soil foundation |
| CN110579308A (en) * | 2019-10-11 | 2019-12-17 | 中国海洋大学 | Device and method for observing pressure of submarine sediments |
| CN111735930A (en) * | 2020-05-12 | 2020-10-02 | 温州大学 | Integrated underground soil body measuring device |
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| JP2002340549A (en) * | 2001-05-18 | 2002-11-27 | Central Japan Railway Co | Settlement measuring instrument |
| CN205537607U (en) * | 2016-04-13 | 2016-08-31 | 三峡大学 | Automatic settlement observation appearance |
| CN206479166U (en) * | 2016-12-19 | 2017-09-08 | 杭州久智自动化技术有限公司 | A kind of soil body deep settlement and pore water pressure measurement device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002340549A (en) * | 2001-05-18 | 2002-11-27 | Central Japan Railway Co | Settlement measuring instrument |
| CN205537607U (en) * | 2016-04-13 | 2016-08-31 | 三峡大学 | Automatic settlement observation appearance |
| CN206479166U (en) * | 2016-12-19 | 2017-09-08 | 杭州久智自动化技术有限公司 | A kind of soil body deep settlement and pore water pressure measurement device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108001459A (en) * | 2017-12-08 | 2018-05-08 | 杭州久智自动化技术有限公司 | Railcar discrepancy station structure |
| CN108001459B (en) * | 2017-12-08 | 2023-09-08 | 杭州久智自动化技术有限公司 | Rail car access structure |
| CN109029346A (en) * | 2018-08-15 | 2018-12-18 | 浙江广川工程咨询有限公司 | Osmotic pressure and integrated monitoring device and measurement method are settled in a kind of soft soil foundation |
| CN109029346B (en) * | 2018-08-15 | 2020-12-11 | 浙江广川工程咨询有限公司 | Integrated monitoring device and measuring method for osmotic pressure and settlement in soft soil foundation |
| CN110579308A (en) * | 2019-10-11 | 2019-12-17 | 中国海洋大学 | Device and method for observing pressure of submarine sediments |
| CN110579308B (en) * | 2019-10-11 | 2023-12-22 | 中国海洋大学 | Submarine sediment pressure observation device and method |
| CN111735930A (en) * | 2020-05-12 | 2020-10-02 | 温州大学 | Integrated underground soil body measuring device |
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