CN109680733A - The displacement of foundation pit rigid retaining walls induces the model test apparatus and operating method for cheating outer ground surface soil body sedimentation - Google Patents
The displacement of foundation pit rigid retaining walls induces the model test apparatus and operating method for cheating outer ground surface soil body sedimentation Download PDFInfo
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- CN109680733A CN109680733A CN201910077047.0A CN201910077047A CN109680733A CN 109680733 A CN109680733 A CN 109680733A CN 201910077047 A CN201910077047 A CN 201910077047A CN 109680733 A CN109680733 A CN 109680733A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- General Engineering & Computer Science (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
It is conjugated the invention discloses a kind of foundation pit rigid retaining walls and induces the model test apparatus and operating method of cheating outer ground surface soil body sedimentation, it includes: to fill native case which, which mainly forms, for loading foundation soil；Rigid retaining walls, for simulating the displacement of retaining wall in foundation pits；Dynamical system, to simulate different tests operating condition；Measurement system, the measurement for rigid retaining walls horizontal displacement and soil body settling amount.Compared with the prior art, apparatus of the present invention structure is simple, and method operation is convenient；A variety of operating condition of test can be simulated, using the indoor model test under simple barricade difference wall movement mode, boundary condition and influence factor are clear, can effectively disclose the settlement law for cheating outer ground surface soil body.The present invention can very well simulation foundation pit rigid retaining walls under different wall movement modes and different barricade horizontal displacement actuating members, cheat the sedimentation of outer ground surface soil body, and then the settlement law for cheating outer ground surface soil body is disclosed, it can cause to cheat outer Ground surface settlement to provide to test referring to for excavation of foundation pit.
Description
Technical field
The present invention relates to base pit engineering field, in particular to it is heavy that a kind of foundation pit rigid retaining walls displacement induces the outer ground surface soil body in hole
The model test apparatus and operating method of drop.
Background technique
The development in city, so that the underground space is more and more developed, the environmental problem thus caused is also more tight
Weight.As the excavation of foundation pit is deeper and deeper, area is increasing, the design and construction of foundation pit enclosure structure become increasingly complex, base
The influence that hole excavates to surrounding enviroment is increasingly valued by people.Ground settlement will cause periphery adjacent to buildings or structures,
The destruction of road, cable and underground piping brings different degrees of the problems of geo-environment.For a long time, excavation of foundation pit induces ground
Layer settles this typical Environmental Geotechnical Problems and is concerned.
Excavation of foundation pit can inevitably break the original stress field of the soil body, so that the soil body generates Unloading Deformation, it is outer to induce hole
The earth's surface soil body generates sedimentation.In fact promote the factor for cheating outer ground surface soil body generation sedimentation complex, other than wall displacement,
Building enclosure rigidity, support form, precipitation and earth's surface preloading can all induce ground settlement, this makes in engineering practice, foundation pit
The ground settlement that periphery is monitored is mostly by the coefficient result of various construction factors.Although foundation pit enclosure structure is scratched
Song deformation is easy to survey, but it is seen that being directly based upon field monitoring data comes the quantitative displacement of feedback barricade and ground settlement
Correlation undoubtedly difficulty is larger.Compare field monitoring, and indoor model test boundary condition is clear, influence factor is opposite can
Control, therefore, it is very necessary for disclosing Ground Settlement Monitoring by means of the indoor model test under simple barricade wall movement mode.
Although the wall movement mode of retaining wall in foundation pits is more complex in practical Excavation Process, however, a large amount of field measurements
Back analysis shows that field observation is whole in polyline shaped to barricade displacement, can the equivalent superposition at all kinds of rigid deformation modes.Cause
This inquires into emphatically influence of the operating condition of different rigidity barricade displacement to outer ground settlement is cheated, by rigid gear to simplify case study
Wall wall movement mode is divided into barricade translation (T mode), rotates 3 kinds of (RB mode) and passing-flow resistance (RT mode) etc. around toe of wall substantially
Displacement model.
Summary of the invention
The settlement law for cheating outer ground surface soil body under different wall movement modes for research retaining wall in foundation pits considers existing model test
Deficiency existing for device conjugates the present invention provides a kind of foundation pit rigid retaining walls and induces the model test for cheating outer ground surface soil body sedimentation
Device and operating method, energy simplicity, accurate simulation retaining wall in foundation pits are in different wall movement modes and different barricade maximum horizontals position
The settlement law test of outer ground surface soil body is cheated under the conditions of shifting.
Solution of the invention are as follows: a kind of foundation pit rigid retaining walls displacement induces the model test of the outer ground surface soil body sedimentation in hole
Device, including fill native case, rigid retaining walls, dynamical system and measurement system；
The native case of the dress is spliced by organic glass, brandreth and iron plate, and the organic glass fills native case side for making
Wall plays a supportive role；The brandreth plays skeleton fixed function for being assembled into the native cabinet frame of dress；The iron plate is for making dress
Native case bottom base panel guarantees the friction for having sufficient between the soil body and bottom；The soil sample loaded in native case that fills is foundation soil, test
The rigid retaining walls height that foundation soil filling height is 0.8~0.95 times in the process；
The rigid retaining walls are matched with shaft, and the shaft is set to rigid retaining walls quadrangle, shaft outer distance boundary
0.05 times of rigid retaining walls height, shaft are connected with the mounting hole on the native case side wall of dress, rigid retaining walls side wall, and shaft can be free
It removes to realize rigid retaining walls around toe of wall or wall top rotation wall movement mode；The side wall of rigid retaining walls is installed for sealing the close of the soil body
Strip of paper used for sealing；
The dynamical system includes motor, telescopic rod and fixed link, and the motor that the motor is located on the outside of rigid retaining walls is held
On platform, motor can apply horizontal loading to rigid retaining walls, and to control rigid retaining walls displacement, the end of the telescopic rod and rigidity are kept off
Wall position of action point according to the different operating conditions simulated of test between 0.3 times of rigid retaining walls wall it is high~0.7 times of rigid retaining walls
Between wall height, preferably at 0.5 times of the high position of rigid retaining walls wall, when pulling out upper (lower) end shaft, rigid retaining walls can be under
(on) shaft is held to rotate, the fixed link can prevent rigid retaining walls parallel at it between telescopic rod and rigid retaining walls
It rotates in plane, can realize rigid retaining walls translation displacement by means of motor power load.
The measurement system includes LVDT displacement sensor, bracket, telescopic rod and rigid metal bar, and the LVDT displacement passes
Sensor test displacement meter precision used is 0.01mm, maximum range 80mm, for being measured to rigid retaining walls horizontal displacement and
The soil body settles amount measurement, and for the bracket for fixing LVDT displacement sensor, the telescopic rod is perpendicularly oriented to rigid retaining walls, with
The power of motor acts on, and rigid retaining walls conjugate, and LVDT displacement sensor, which can synchronize, measures rigid retaining walls displacement, described rigid
Property metallic rod be arranged in central axes above the native case of dress, for fixing LVDT displacement sensor, settle amount measurement for the soil body.
Further, for the inside length for filling native case having a size of 2.0m × 1.0m × 1.0m, cabinet is 25mm thick
Organic glass material composition.
Further, the material of the rigid retaining walls is aluminium sheet, and the elasticity modulus of the rigid retaining walls is 70GPa, high,
Wide, thick size is respectively 1m × 1m × 0.020m.
Further, the iron plate in the dress native bottom portion is equipped with drawable soil-unloading port.
Further, the shaft is detachable, when insertion two shafts of lower section remove two shaft of top, in dynamical system
Achievable rigid retaining walls rotate wall movement mode around toe of wall under effect；When insertion two shafts of top remove two shaft of lower section, then
Rigid retaining walls passing-flow resistance mode can be achieved；(rigidity is prevented when removing upper and lower four shafts simultaneously and installing two fixed links
Barricade rotates) after, achievable rigid retaining walls translate wall movement mode.
Further, the motor is applied for horizontal loading needed for simulating various operating condition of test, by means of motor power
Load can realize rigid retaining walls translation displacement, and the bit-rate of rigid retaining walls position, test are realized by the reduction gearbox of motor
In the process by rigid retaining walls displacement control in 1mm/min.
Further, the rigid metal bar is arranged in central axes above the native case of dress, and LVDT displacement sensor upper end is pressed from both sides
It is held on rigid metal bar, is clamped at the different location of rigid metal bar by changing LVDT displacement sensor, is measured respectively
The ground settlement value of corresponding position.
Further, 4 dismountable shafts of the quadrangle of the rigid retaining walls and the setting of side wall junction cooperate power
System realizes a variety of rigid retaining walls wall movement modes；The dynamical system realizes rigid retaining walls position by the reduction gearbox of motor
Bit-rate.
A kind of foundation pit rigid retaining walls displacement induces the operating method for the model test apparatus that the outer ground surface soil body in hole settles, including
Following steps:
Step 1: soil sample, peace are loaded in the inspection and correction of measuring cell LVDT displacement sensor and instrument before being tested
Each bracket, telescopic rod and rigid metal bar are filled, in LVDT displacement transducer fixed support and rigid metal bar；
Step 2: the measurement of rigid retaining walls horizontal displacement, in order to study soil body settling amount and rigid retaining walls horizontal displacement after wall
Between relationship, need to measure the actual displacement of rigid retaining walls under every kind of operating condition, LVDT displacement sensor is fixed on bracket, stretches
Contracting bar is perpendicularly oriented to rigid retaining walls, and as the power of motor acts on, rigid retaining walls are conjugated, the same pacing of LVDT displacement sensor
Rigid retaining walls are displaced out, and the LVDT displacement sensor of measurement rigid retaining walls displacement shares 4, wherein 2 are arranged in rigid retaining walls
On central axes, the rigid retaining walls wall of 1 0.25 times away from rigid retaining walls upper end of top is high, and lower section 1 is away from rigid retaining walls lower end 0.25
Rigid retaining walls wall again is high, and the rigid retaining walls wall that 2 spacing are 0.5 times is high；Remaining 2 LVDT displacement sensor respectively symmetrically cloth
Set on the perpendicular bisector of upper and lower LVDT displacement sensor line, and respectively 0.25 times away from rigid retaining walls or so lateral boundaries just
The property wide distance of barricade wall, for monitoring whether rigid retaining walls deflect around certain vertical axis；It can be displaced and be passed by above-mentioned 4 LVDT
The wall movement mode of sensor Real-time Feedback rigid retaining walls.
Step 3: before rigid retaining walls displacement starts, rigid retaining walls rolling earth behind retaining wall superficial part is smoothed out by claying board, and passes through gas
Soaked level is levelling, measures soil body surface with LVDT displacement sensor later, records initial reading, rigid retaining walls are indexed to specified
Bitwise after stand 3h, make soil body settlement stability after wall, start measure wall after soil body sedimentation value, measure wall after ground settlement
Horizontal extent be 2H (a height of H of wall), in test, to ensure settlement stability, measure a soil body sedimentation at regular intervals, to
Data no longer change, that is, determine that sedimentation is complete.
The advantages of present invention has is as follows:
The present invention discloses Ground Settlement Monitoring using the indoor model test under simple rigid retaining walls wall movement mode, can be with
Respectively simulate three kinds of basic barricade wall movement modes, by control rigid retaining walls maximum horizontal displacement, monitor wall after the soil body settle away from
From changing rule, the position of soil body settling height and largest settlement can be obtained in terms of quantitative, and then as practical work
The simulation of condition has more important engineering and significance of scientific research to predict and controlling the sedimentation for cheating outer earth's surface in Excavation Process.
Detailed description of the invention
Fig. 1 is rigid retaining walls structural map of the invention；
Fig. 2 is the overall schematic of model equipment of the present invention；
Fig. 3 is model equipment top view of the present invention；
Fig. 4 is model equipment side view of the present invention；
Fig. 5 is that retaining wall in foundation pits conjugates schematic diagram (a barricade translation；B barricade is rotated around toe of wall；C barricade passing-flow resistance)；
In figure, 1. motors；2. motor cushion cap；3. telescopic rod；4. bracket；5. rigid retaining walls；6. shaft；7. filling native case；8.
Rigid metal bar；9.LVDT displacement sensor；10. soil-unloading port；11. soil sample；12. brandreth；13. sealing strip；14. mounting hole.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is further explained.It should be understood that these embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, ability
Field technique personnel can make various changes or modifications the present invention, and such equivalent forms equally fall within the application appended claims
Book limited range.
Embodiment 1
As Figure 1-Figure 4, it conjugates to induce the present embodiment provides a kind of foundation pit rigid retaining walls and cheats outer ground surface soil body sedimentation
Model test apparatus, including fill native case 7, rigid retaining walls 5, dynamical system and measurement system；
The native case 7 of the dress is spliced by organic glass, brandreth 12 and iron plate, and the organic glass fills native case for making
7 side walls, play a supportive role；The brandreth 12 plays skeleton fixed function for being assembled into dress 7 frame of native case；The iron plate is used for
Production fills 7 bottom base panel of native case, guarantees the friction for having sufficient between the soil body and bottom；The soil sample 11 of filling is in the native case 7 of dress
Foundation soil, 5 height of rigid retaining walls that foundation soil filling height is 0.8~0.95 times during test；
The rigid retaining walls 5 are matched with shaft 6；The shaft is set to 5 four jiaos of rigid retaining walls, and shaft 6 is apart from outside
5 height of rigid retaining walls that 0.05 times of boundary, shaft 6 are connected with the mounting hole 14 on 7 side wall of the native case of dress, 5 side wall of rigid retaining walls, turn
Axis 6 can be removed freely to realize rigid retaining walls 5 around toe of wall or wall top rotation wall movement mode；The side wall installation of rigid retaining walls 5 is used for
Seal the sealing strip 13 of the soil body；
The dynamical system includes motor 1, telescopic rod 3 and fixed link, and the motor 1 is located at the electricity in 5 outside of rigid retaining walls
On machine cushion cap 2, motor can apply horizontal loading to rigid retaining walls 5, to control the displacement of rigid retaining walls 5, the end of the telescopic rod 3
From 5 position of action point of rigid retaining walls according to the different operating conditions simulated of test between 0.3 times of 5 wall of rigid retaining walls it is high~0.7 times
Rigid retaining walls 5 walls height between, preferably at 0.5 times of the high position of 5 wall of rigid retaining walls, when pulling out upper (lower) end shaft 6, just
Property barricade can under (on) end shaft 6 rotates, the fixed link can prevent rigid positioned at telescopic rod 3 and rigid retaining walls 5 between
Property barricade 5 rotate in its parallel plane, by means of motor power load can realize rigid retaining walls 5 translation displacement.
The measurement system has LVDT displacement sensor 9, bracket 4, telescopic rod 3 and rigid metal bar 8, the LVDT displacement
It is 0.01mm, maximum range 80mm that sensor 9, which tests displacement meter precision used, for 5 horizontal displacement of rigid retaining walls
It surveys and the soil body settles amount measurement, for the bracket 4 for fixing LVDT displacement sensor 9, the telescopic rod 3 is perpendicularly oriented to rigid gear
Wall 5, as the power of motor 1 acts on, rigid retaining walls 5 are conjugated, and LVDT displacement sensor 9 can synchronize and measure rigid retaining walls
5 displacements, the rigid metal bar 8 are arranged in 7 top central axes of the native case of dress and are used for the soil body for fixing LVDT displacement sensor 9
Settle amount measurement.
Further, for the inside length for filling native case 7 having a size of 2.0m × 1.0m × 1.0m, cabinet is 25mm thick
Organic glass material composition.
Further, the material of the rigid retaining walls 5 is aluminium sheet, and the elasticity modulus of the rigid retaining walls 5 is 70GPa,
High, wide, thick size is respectively 1m × 1m × 0.020m.
Further, the iron plate of 5 bottom of the native case of dress is equipped with drawable soil-unloading port 10.
Further, the shaft 6 is detachable, when insertion two shafts 6 of lower section remove two shaft 6 of top, in power
Rigid retaining walls 5 can be achieved under systemic effect and rotate wall movement mode around toe of wall；When insertion two shafts 6 of top remove two shafts of lower section
When 6, then 5 passing-flow resistance mode of rigid retaining walls can be achieved；When simultaneously remove upper and lower four shafts 6 and install two fixed links
After (rigid retaining walls is prevented to rotate), achievable rigid retaining walls 5 translate wall movement mode.
Further, the motor 1 is applied for horizontal loading needed for simulating various operating condition of test, by means of motor power
Load can realize the translation displacement of rigid retaining walls 5, and the bit-rate of 5 position of rigid retaining walls, examination are realized by the reduction gearbox of motor 1
By 5 displacement control of rigid retaining walls in 1mm/min during testing.
Further, the rigid metal bar 8 is arranged in 7 top central axes of the native case of dress, by 9 upper end of LVDT displacement sensor
It is held on rigid metal bar 8, is clamped at the different location of rigid metal bar by changing LVDT displacement sensor 9, respectively
Measure the ground settlement value of corresponding position.
Further, 4 of quadrangle Yu side wall the junction setting of the rigid retaining walls 5 dismountable cooperations of shaft 6 are dynamic
Force system realizes a variety of rigid retaining walls wall movement modes；The dynamical system can realize rigid retaining walls effect by the reduction gearbox of motor
The bit-rate of point.
The operating method of the model test apparatus of the outer ground surface soil body sedimentation in foundation pit rigid retaining walls displacement induction hole, including with
Lower step:
Step 1: soil sample 11 is loaded in the inspection and correction of measuring cell LVDT displacement sensor 9 and instrument before being tested,
Each bracket 4, telescopic rod 3 and rigid metal bar 8 are installed, LVDT displacement sensor 9 is fixed on bracket 4 and rigid metal bar 8；
Step 2: the measurement of 5 horizontal displacement of rigid retaining walls, in order to study soil body settling amount and rigid retaining walls horizontal position after wall
Relationship between shifting, needs to measure the actual displacement of rigid retaining walls 5 under every kind of operating condition, and LVDT displacement sensor 9 is fixed on bracket 4
On, telescopic rod 3 is perpendicularly oriented to rigid retaining walls 5, and as the power of motor 1 acts on, rigid retaining walls 5 are conjugated, and LVDT displacement passes
Sensor 9, which synchronizes, measures the displacement of rigid retaining walls 5, and the LVDT displacement sensor 9 that measurement rigid retaining walls 5 conjugate shares 4, wherein 2
Be arranged on 5 central axes of rigid retaining walls, the rigid retaining walls wall of 1 0.25 times away from 5 upper end of rigid retaining walls of top is high, lower section 1 away from
The rigid retaining walls wall of 0.25 times of 5 lower end of rigid retaining walls is high, and the rigid retaining walls wall that 2 spacing are 0.5 times is high；Remaining 2 LVDT
Displacement sensor 9 be symmetrically arranged at on the perpendicular bisector of 9 line of upper and lower LVDT displacement sensor, and respectively away from rigid gear
The wide distance of wall 5 or so lateral boundaries, 0.25 times of wall, for monitoring whether rigid retaining walls 5 deflect around certain vertical axis；It can be by upper
State the wall movement mode of 4 LVDT displacement sensors, 9 Real-time Feedback rigid retaining walls.
Step 3: before the displacement of rigid retaining walls 5 starts, rigid retaining walls rolling earth behind retaining wall superficial part is smoothed out by claying board, and passes through gas
Soaked level is levelling, measures soil body surface with LVDT displacement sensor 9 later, records initial reading, and rigid retaining walls 5 are indexed to finger
3h is stood after fixed Bitwise, makes soil body settlement stability after wall, starts soil body sedimentation value after measurement wall, earth's surface is heavy after measuring wall
The horizontal extent of drop is 2H (a height of H of wall), in test, to ensure settlement stability, measures a soil body sedimentation at regular intervals,
Pending data no longer changes, that is, determines that sedimentation is complete.
Each main device parameter of the present embodiment is as follows:
The inside length of native case 7 is filled having a size of 2.0m × 1.0m × 1.0m；
The wall thickness 25mm for filling native case 7；
The height of the rigid retaining walls 5, width, thick size are respectively 1m × 1m × 0.020m；
It should be noted that above-mentioned having a size of the suggestion size that provides of the present invention, specific size can according to actual requirement into
Row change.
Claims (10)
1. a kind of foundation pit rigid retaining walls displacement induces the model test apparatus for cheating outer ground surface soil body sedimentation, it is characterised in that: including
Fill native case, rigid retaining walls, dynamical system and measurement system；
The native case of the dress is spliced by organic glass, brandreth and iron plate, and the organic glass fills native case side wall for making, and is risen
Supporting role；The brandreth plays skeleton fixed function for being assembled into the native cabinet frame of dress；The iron plate fills native bottom for making
Portion's bottom plate；The soil sample loaded in native case that fills is foundation soil, and foundation soil filling height is high for 0.8~0.95 times of rigid retaining walls
Degree；
The rigid retaining walls are matched with shaft, and the shaft is set to rigid retaining walls quadrangle, and 0.05 times of shaft outer distance boundary
Rigid retaining walls height, shaft with fill native case side wall, the mounting hole on rigid retaining walls side wall is connected, shaft can freely remove with
Realize that rigid retaining walls rotate wall movement mode around toe of wall or wall top；The side wall of rigid retaining walls installs the sealing strip for sealing the soil body；
The dynamical system includes motor, telescopic rod and fixed link, and the motor is located on the motor cushion cap on the outside of rigid retaining walls,
Motor can apply horizontal loading to rigid retaining walls, and to control rigid retaining walls displacement, the end of the telescopic rod and rigid retaining walls are made
With position according to the different operating conditions simulated of test between 0.3 times of rigid retaining walls wall it is high~0.7 times of rigid retaining walls wall is high
Between, when pulling out upper (lower) end shaft, rigid retaining walls can under (on) end shaft rotates, the fixed link is located at flexible
Between bar and rigid retaining walls, rigid retaining walls can be prevented to rotate in its parallel plane, it can be real by means of motor power load
Existing rigid retaining walls translation displacement；
The measurement system includes LVDT displacement sensor, bracket, telescopic rod and rigid metal bar, for rigid retaining walls level
Displacement measures and the soil body settles amount measurement, and for fixing LVDT displacement sensor, the telescopic rod is perpendicularly oriented to just the bracket
Property barricade, the rigid metal bar is arranged in central axes above the native case of dress, heavy for the soil body for fixing LVDT displacement sensor
Amount measurement drops.
2. a kind of foundation pit rigid retaining walls displacement according to claim 1 induces the model test dress for cheating outer ground surface soil body sedimentation
It sets, it is characterised in that: having a size of 2.0m × 1.0m × 1.0m, cabinet is that 25mm is thick to be had the inside length for filling native case
Machine glass material composition.
3. a kind of foundation pit rigid retaining walls displacement according to claim 1 induces the model test dress for cheating outer ground surface soil body sedimentation
It sets, it is characterised in that: the material of the rigid retaining walls is aluminium sheet, and the elasticity modulus of the rigid retaining walls is 70GPa, high, wide,
Thick size is respectively 1m × 1m × 0.020m, and the end of the telescopic rod and rigid retaining walls position of action point are preferably at 0.5 times
At the high position of rigid retaining walls wall.
4. a kind of foundation pit rigid retaining walls displacement according to claim 1 induces the model test dress for cheating outer ground surface soil body sedimentation
It sets, it is characterised in that: the iron plate in the dress native bottom portion is equipped with drawable soil-unloading port.
5. a kind of foundation pit rigid retaining walls displacement according to claim 1 induces the model test dress for cheating outer ground surface soil body sedimentation
It sets, it is characterised in that: the shaft is detachable, when insertion two shafts of lower section remove two shaft of top, makees in dynamical system
Wall movement mode is rotated around toe of wall with lower achievable rigid retaining walls；When insertion two shafts of top remove two shaft of lower section, then may be used
Realize rigid retaining walls passing-flow resistance mode；It is achievable rigid after removing upper and lower four shafts simultaneously and two fixed links are installed
Property barricade translate wall movement mode.
6. a kind of foundation pit rigid retaining walls displacement according to claim 1 induces the model test dress for cheating outer ground surface soil body sedimentation
It sets, it is characterised in that: the motor is applied for horizontal loading needed for simulating various operating condition of test, by means of motor power load
Rigid retaining walls translation displacement can be achieved, the bit-rate of rigid retaining walls position is realized by the reduction gearbox of motor, tests process
It is middle by rigid retaining walls displacement control in 1mm/min.
7. a kind of foundation pit rigid retaining walls displacement according to claim 1 induces the model test dress for cheating outer ground surface soil body sedimentation
It sets, it is characterised in that: the rigid metal bar is arranged in central axes above the native case of dress, and LVDT displacement sensor upper end is held on
On rigid metal bar, changes LVDT displacement sensor and be clamped at the different location of rigid metal bar, measure corresponding position respectively
Ground settlement value.
8. a kind of foundation pit rigid retaining walls displacement according to claim 1 induces the model test dress for cheating outer ground surface soil body sedimentation
It sets, it is characterised in that: 4 dismountable shafts of the quadrangle of the rigid retaining walls and the setting of side wall junction cooperate dynamical system
Realize a variety of rigid retaining walls wall movement modes；The dynamical system can realize the change of rigid retaining walls position by the reduction gearbox of motor
Bit rate.
9. a kind of foundation pit rigid retaining walls displacement according to claim 1 induces the model test dress for cheating outer ground surface soil body sedimentation
It sets, it is characterised in that: LVDT displacement sensor test displacement meter precision used is 0.01mm, maximum range 80mm.
10. a kind of foundation pit rigid retaining walls displacement described in claim 1 induces the model test apparatus for cheating outer ground surface soil body sedimentation
Operating method, which comprises the following steps:
Step 1: soil sample is loaded in the inspection and correction of measuring cell LVDT displacement sensor and instrument before being tested, and installation is each
Bracket, telescopic rod and rigid metal bar, LVDT displacement sensor are fixed on bracket and rigid metal bar；
Step 2: the measurement of rigid retaining walls horizontal displacement, in order to study after wall between soil body settling amount and rigid retaining walls horizontal displacement
Relationship, need to measure the actual displacement of rigid retaining walls under every kind of operating condition, LVDT displacement sensor is fixed on bracket, telescopic rod
Rigid retaining walls are perpendicularly oriented to, rigid retaining walls conjugate, and LVDT displacement sensor, which synchronizes, measures rigid retaining walls displacement, measurement rigidity
The LVDT displacement sensor of barricade displacement shares 4, wherein 2 are arranged on rigid retaining walls central axes, top 1 is away from rigid gear
The rigid retaining walls wall of 0.25 times of wall upper end is high, and the rigid retaining walls wall of 1 0.25 times away from rigid retaining walls lower end of lower section is high, 2 spacing
It is high for 0.5 times of rigid retaining walls wall；Remaining 2 LVDT displacement sensor is symmetrically arranged to be displaced with upper and lower LVDT and pass
On the perpendicular bisector of sensor line, and the wide distance of 0.25 times away from rigid retaining walls or so lateral boundaries rigid retaining walls wall respectively, for supervising
Survey whether rigid retaining walls deflect around certain vertical axis；It can be by above-mentioned 4 LVDT displacement sensor Real-time Feedback rigid retaining walls
Wall movement mode；
Step 3: before rigid retaining walls displacement starts, rigid retaining walls rolling earth behind retaining wall superficial part is smoothed out by claying board, and passes through air-bubble
Level is levelling, measures soil body surface with LVDT displacement sensor later, records initial reading, and rigid retaining walls are indexed to specified change
3h is stood after the state of position, starts soil body sedimentation value after measurement wall, the horizontal extent of ground settlement is that (wall is a height of by 2H after measurement wall
H), in test, a soil body sedimentation is measured at regular intervals, and pending data no longer changes, that is, determines that sedimentation is complete.
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| CN112729232A (en) * | 2021-01-13 | 2021-04-30 | 中铁十一局集团有限公司 | Method for predicting surface settlement outside pit and considering whole process of foundation pit excavation in soft soil area |
| CN113216197A (en) * | 2021-05-08 | 2021-08-06 | 浙江大学建筑设计研究院有限公司 | Unearthed protective structure for arranging slope ramp by digging hole through pit-dividing fender pile |
| CN114417480A (en) * | 2022-02-07 | 2022-04-29 | 中铁十一局集团有限公司 | Rectangular foundation pit variable-rigidity underground continuous wall and dynamic design method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112729232A (en) * | 2021-01-13 | 2021-04-30 | 中铁十一局集团有限公司 | Method for predicting surface settlement outside pit and considering whole process of foundation pit excavation in soft soil area |
| CN112729232B (en) * | 2021-01-13 | 2022-05-17 | 中铁十一局集团有限公司 | Method for predicting surface settlement outside pit and considering whole process of foundation pit excavation in soft soil area |
| CN113216197A (en) * | 2021-05-08 | 2021-08-06 | 浙江大学建筑设计研究院有限公司 | Unearthed protective structure for arranging slope ramp by digging hole through pit-dividing fender pile |
| CN113216197B (en) * | 2021-05-08 | 2022-04-19 | 浙江大学建筑设计研究院有限公司 | Unearthed protective structure for arranging slope ramp by digging hole through pit-dividing fender pile |
| CN114417480A (en) * | 2022-02-07 | 2022-04-29 | 中铁十一局集团有限公司 | Rectangular foundation pit variable-rigidity underground continuous wall and dynamic design method thereof |
| CN116465312A (en) * | 2023-05-29 | 2023-07-21 | 通用技术集团国测时栅科技有限公司 | Non-contact type closed linear displacement sensor structure |
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