CN210636475U - Single-row or double-row anti-slide pile action mechanism model test device - Google Patents
Single-row or double-row anti-slide pile action mechanism model test device Download PDFInfo
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Abstract
The utility model provides a single-row or double-row anti-slide pile mechanism of action model test device, which comprises a model box and a loading device, wherein the model box comprises an inclined slide surface retaining plate, two sides of the slide surface retaining plate are vertically provided with side retaining plates, the bottom end of the slide surface retaining plate is vertically provided with a bottom retaining plate, and a loading plate is horizontally arranged above the slide surface retaining plate; the landslide surface soil retaining plate, the two side soil retaining plates, the bottom soil retaining plate and the loading plate form a soil containing space together; an anti-slide pile group is vertically arranged in the soil containing space; the loading device comprises a jack for applying force to the loading plate. The utility model discloses can be more comprehensive through the all-round soil body soil pressure development of model test mode research single row or double friction pile under different operating modes changes and pile body atress law to reveal the mechanism of action of single row or double friction pile.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering and geological engineering, a model test device is related to, concretely relates to single row or double friction pile mechanism of action model test device.
Background
The reinforcement and treatment of the high slope is a construction project with complicated technology and huge investment. After the practice of landslide control for 60 years in China, a set of better slope reinforcement control method and technology is formed, wherein the application of the anti-slide pile retaining technology is rapid, and when engineering measures such as slope cutting, load reduction, drainage, retaining walls and the like are not enough to solve the problem of slope stability, a retaining structure such as single-row or double-row anti-slide piles and the like can be used for rapidly and safely solving some slope reinforcement engineering problems.
However, as a supporting structure with a short development duration, the research on how to resist the soil pressure and how to develop and evolve the soil pressure under the action of landslide thrust is still in the starting stage, and especially, the research on the problems of transmission, development and evolution law of the soil pressure around the pile under different slope inclination angles of the landslide slope, corresponding pile body stress law and the like which need to be considered in the design is unknown. In addition, for the single-row slide-resistant pile, the difference of the embedding modes (such as half-embedded pile and full-embedded pile) can cause the difference of the stress of the pile body, and no clear conclusion is made.
In addition, compared with a single-row anti-slide pile, the double-row anti-slide pile belongs to a hyperstatic structure, so that bending and pulling deformation of soil pressure on the double-row anti-slide pile can be reduced through self deformation coordination, and the stability of the supporting structure is greatly improved. Therefore, there is a need to develop a special device and method for single-row or double-row slide-resistant pile mechanism research.
SUMMERY OF THE UTILITY MODEL
The utility model provides a single row or double friction pile mechanism of action model test device can know the domatic inclination of landslide comprehensively, friction pile embedding mode (partly bury or bury entirely), the different arrangement form of double friction pile (if parallel arrangement, triangle-shaped arrange etc.) and the different row spacing of double friction pile under the operating mode soil body soil pressure transmission of pile, development evolution law and corresponding pile body atress law.
In order to achieve the above object, the utility model adopts the following technical scheme to realize:
a single-row or double-row anti-slide pile mechanism model test device comprises a model box and a loading device,
the model box comprises an inclined slide surface soil retaining plate, side soil retaining plates are vertically arranged on two sides of the slide surface soil retaining plate, a bottom soil retaining plate is vertically arranged at the bottom end of the slide surface soil retaining plate, and a loading plate is horizontally arranged above the slide surface soil retaining plate; the landslide surface soil retaining plate, the two side soil retaining plates, the bottom soil retaining plate and the loading plate form a soil containing space together;
one or two groups of anti-slide pile groups are vertically arranged in the soil containing space; the loading device comprises a jack for applying force to the loading plate.
The slope surface soil retaining plate is inclined, one end is a high end, and the other end is a low end.
The device comprises a group of anti-slide piles, a single-row anti-slide pile action mechanism model test device and a double-row anti-slide pile action mechanism model test device.
Further preferably, a group of slide-resistant piles of the single-row slide-resistant pile action mechanism model test device are arranged in slide-resistant pile group grooves in the retaining plate of the slide slope surface, and the number of the group of slide-resistant piles is 3-4 and is uniformly distributed.
Further preferably, the double-row anti-slide piles comprise a first anti-slide pile group and a second anti-slide pile group, the first anti-slide pile group is arranged in a first anti-slide pile groove on the retaining plate of the sliding surface, and the second anti-slide pile group is arranged in a second anti-slide pile groove at the tail end of the retaining plate of the sliding surface and clings to the inner side of the retaining plate at the bottom.
The number of the slide-resistant piles of the first slide-resistant pile group is 2-3; the number of the slide-resistant piles of the second slide-resistant pile group is 3-4.
Preferably, the loading device further comprises a reaction frame for fixing the jack, the reaction frame comprises a quadrilateral bottom surface, a quadrilateral top surface and vertical steel pipes for connecting the bottom surface and the top surface, the steel pipes are arranged at four corners of the bottom surface and the top surface, and the jack is arranged below the top surface in an inverted mode. The top surface is provided with 4 mounting holes, and the jack is fixed on the top surface through the mounting holes. The corresponding position of the jack is provided with a mounting hole, and the jack is fixed on the top surface of the counter-force frame by a bolt penetrating through the mounting hole.
Preferably, one end of the model box is provided with a support frame for fixing the side retaining plate, and the support frame comprises two vertically arranged support columns and a cross beam for connecting the two support columns. The crossbeam welding is in the support post upper end, and the crossbeam is used for supporting the domatic fender apron. The support post lower extreme is equipped with square base, and the base plays the effect of firm support post.
Preferably, the supporting columns are provided with slots for fixing the side retaining plates, and the width and the height of each slot correspond to the thickness and the height of each side retaining plate.
Preferably, a support is arranged at one end of the model box opposite to the support upright post, and the support comprises a support plate and a support leg below the support plate. The support is used for supporting the bottom and side soil retaining plates and the one end of the slope surface soil retaining plate. The supporting plate is a quadrilateral plate, and the supporting legs are located at four corners of the quadrilateral plate.
Further preferably, the supporting plate is provided with an opening, and the opening can accommodate the second slide resistant pile group and the bottom retaining plate to pass through.
Further preferably, the second slide-resistant pile groove and the bottom retaining plate groove are welded on the supporting plate and located below the opening, and the second slide-resistant pile group and the bottom retaining plate are fixed. The second slide-resistant pile groove is connected with the bottom soil retaining plate groove to form a support plate groove.
The backup pad recess chooses welding mode to connect in the backup pad for use, and backup pad recess size and the anti slide pile group of second, the board is kept off the soil to agree with completely in bottom to guarantee that the anti slide pile group of second, the board is kept off the soil and perpendicular to ground all the time in bottom, avoided directly setting up the backup pad recess in the backup pad simultaneously, can increase backup pad thickness, cause the support to remove difficulty and cost too high scheduling problem.
Preferably, the included angle between the slope surface retaining plate and the horizontal plane is 30-60 degrees. Further preferably 30 °, 45 °, 60 °.
The high-end bottom that the landslide face kept off the native board is equipped with the fixed slot, and the fixed slot is the semicircular groove corresponding with the crossbeam, and in the crossbeam embedding fixed slot, it was fixed to keep off the high-end of native board with the landslide face, and its position is injectd through bottom fender native board or the second anti slide pile group to the low side that the retaining plate was kept off to the landslide face.
The soil containing space is internally provided with a soil pressure box and a resistance strain gauge, the soil pressure box is embedded at the design position of a test soil body, the resistance strain gauge is adhered at the design position of the surface of the pile body of the anti-slide pile, and the soil pressure box and the resistance strain gauge are both connected with a static strain gauge so as to obtain soil pressure and pile body stress data in the test process.
The slide-resistant pile is a cuboid slide-resistant pile manufactured according to a similar principle.
The soil pressure cell is a strain sensor for measuring soil pressure, is mainly used for measuring the soil pressure change of any point in the soil, can also measure the contact pressure of the soil to the surfaces of structures such as retaining walls, anti-slide piles and the like, and can measure and calculate the numerical value by a static strain gauge.
Resistance strain gauge be a measure the sensor that structure meets an emergency, can paste in the different positions of friction pile to obtain the strain value of pile body under different loading effect, can calculate from this and obtain the pile body atress condition.
Preferably, the static strain gauge adopts a DH-3816 type static strain test system which is stable and has accurate monitoring results.
In order to research the soil pressure development and evolution law of the soil body around the pile under the action of external load and the corresponding pile body stress law and disclose the action mechanism of the single-row or double-row anti-slide pile, the application also provides a single-row or double-row anti-slide pile action mechanism model test method, which comprises the following steps:
(I) building single-row or double-row slide-resistant pile mechanism analysis model
Sticking resistance type strain gauges on the designed position of the pile body surface, sequentially assembling a single-row or double-row anti-slide pile action mechanism model test device, pouring a test soil body into a soil containing space in a grading manner, embedding a soil pressure box at different filling heights into the designed position, tamping by using a tamping device, and repeating the steps until the designed filling height is reached; flatly placing a loading plate above a soil body, and finely adjusting the position of a reaction frame to ensure that a jack is opposite to the loading plate;
(II) test
Removing the bottom retaining plate; carrying out graded loading on the test soil body through a jack until the soil body around the slide-resistant pile is damaged; and respectively acquiring the soil pressure value of the soil pressure box and the strain value of the pile body surface resistance strain gauge by using a static strain gauge in the loading process. Adjusting the angle of the slope surface soil retaining plate, and repeating the test; adjusting the height of the anti-slide pile leaking out of the test soil body, and repeating the test; adjusting different arrangement forms (such as parallel arrangement or triangular arrangement) or different row distances of the double-row anti-slide piles, and repeating the test;
(III) analysis of test results
After the test loading is finished, analyzing data collected by the static strain gauges under the working conditions of different landslide surface retaining plate angles, different anti-slide pile embedding modes, different arrangement forms of double rows of anti-slide piles and different column distances, and accordingly obtaining the soil pressure development change rule of soil around the piles under the action of landslide thrust and the stress condition of corresponding anti-slide pile bodies under the action of soil pressure.
The soil pressure around the slide-resistant pile group pile is obtained by reading the strain generated by a strain type soil pressure box buried in the soil body through a static strain gauge and calculating the soil pressure of the point according to the elastic modulus of the soil pressure box. The soil pressure development change rule of the measuring point can be obtained by comparing the soil pressures of the same soil pressure box under different loads under the same working condition; the soil pressure change rule of the anti-slide pile group along the same horizontal plane under the effect of the soil arch effect can be obtained by comparing the soil pressure data of different soil pressure boxes on the same horizontal plane under the same working condition; and the soil pressure change rule of the anti-slide pile group along the same vertical plane under the effect of the soil arch effect can be obtained by comparing the soil pressure data of different soil pressure boxes on the same vertical plane under the same working condition. The stress of the pile body of the anti-slide pile group is obtained by reading the strain value of the resistance strain gauge adhered to the designed position on the surface of the anti-slide pile through a static strain gauge and calculating the stress data of the pile body at the point according to the elastic modulus of the pile body. The most dangerous section position of the slide-resistant pile can be determined by comparing stress conditions of different pile body positions, and the change rule of the stress of the pile body under different working conditions can be obtained.
Through the data analysis, the soil pressure and pile body stress change rules of the anti-slide pile soil arch at different positions and different loading grades in the whole process from generation to damage under different working conditions can be obtained, so that guidance suggestions are provided for the optimal design of the anti-slide pile in actual engineering, and more importantly, theoretical basis and technical support can be provided for establishing a wider single-row or double-row anti-slide pile design calculation method through the single-row or double-row anti-slide pile action mechanism obtained through the data analysis.
Preferably, the double-row anti-slide pile mechanism of action model test device comprises the following specific steps: align earlier and lay the support frame, support and reaction frame, reaction frame upper portion is fixed good jack through the mounting hole with the bolt, then with the slope face keep off the soil board and take in the crossbeam of support frame and the backup pad of support to one side, insert the slot of support post with both sides fender soil board one end again, the other end is taken in the backup pad of support, insert the friction pile in the first friction pile recess of slope face fender soil board and the second friction pile recess on the support respectively, and insert bottom fender soil board in the bottom fender soil board recess of support department.
Pouring the test soil in multiple times, tamping, and burying a soil pressure box at a designed position. The aim of tamping the soil body is to improve the compactness of the soil body and prevent the uneven stress of the soil pressure box.
The arrangement of the soil pressure boxes can ensure that horizontal and vertical plane soil pressure data can be measured simultaneously, so that three-dimensional and spatial soil pressure actual measurement data are formed, and a basis is provided for analysis of soil pressure space change rules.
The rammer is a rammer with the weight of 2.5kg and is used for ramming a test soil body. The rammer includes a cylindrical solid handle, and the required closely knit degree of different soil bodies in the handle one end welding square base can be used to obtain the experiment, and easy and simple to handle and repeatedly usable. The drop distance of the rammer is 5cm, and the rammer is rammed for 1-3 times after filling soil each time.
Preferably, the height of the test soil body is flush with the cross beam of the support frame.
The distance between the adjacent slide-resistant piles in the same slide-resistant pile group is arranged between the slide-resistant pile rows.
The utility model provides a single row or double friction pile mechanism of action model test device, can be more comprehensive pass through under the different operating mode of model test research (like the domatic inclination of different landslides, the different friction pile of difference buries the mode, the different arrangement form of double friction pile and the different row spacing of double friction pile) friction pile group stake week soil body soil pressure transmission, development evolution law and corresponding pile body atress law to reveal single row or double friction pile's mechanism of action.
Drawings
FIG. 1 is a schematic perspective view of a mold box;
FIG. 2 is a front view of a double row slide pile mechanism of action model test device;
FIG. 3 is a right side view of the support bracket;
FIG. 4 is a top view of the support bracket;
FIG. 5 is a top view of the pedestal;
FIG. 6 is a front view of the support plate recess;
FIG. 7 is a schematic view of the pressurizing device;
FIG. 8 is a schematic structural view of a manual tamper;
FIG. 9 is a schematic top view of the reaction frame;
FIG. 10 is a front view of the burying position of the earth pressure cell;
fig. 11 is a plan view of the burying position of the earth pressure cell.
Reference numerals: 1-anti-slide pile group; 1 a-a first slide-resistant pile group; 1 b-a second set of slide resistant stakes; 2-a support frame; 2 a-a support post; 2 b-a cross beam; 2 c-a base; 2 d-slot; 3-support; 3 a-bottom retaining plate groove; 3 b-a support plate; 3 c-a leg; 4-support plate grooves; 4 a-first friction pile groove; 4 b-second friction pile grooves; 5-a landslide surface earth-retaining plate; 6 a-lateral retaining plate; 6 b-bottom retaining plate; 7-reaction frame; 8-a jack; 9-a soil pressure cell; 10-test soil body; 11-mounting holes; 12-load plate.
Detailed Description
Example 1
As shown in fig. 1 to 11, which are schematic structural diagrams of a double-row anti-slide pile mechanism-of-action model test device according to an embodiment of the present invention, the device includes a model box and a loading device,
the model box comprises an inclined slide surface retaining plate 5, two sides of the slide surface retaining plate 5 are vertically provided with side retaining plates 6a, the bottom end of the slide surface retaining plate 5 is vertically provided with a bottom retaining plate 6b, and a loading plate 12 is horizontally arranged above the slide surface retaining plate 5; the landslide surface soil retaining plate 5, the two side soil retaining plates 6a, the bottom soil retaining plate 6b and the loading plate 12 form a soil containing space together;
two sets of anti-slide pile groups 1 are vertically arranged in the soil containing space;
the loading means comprises a jack 8 for applying a force to a loading plate 12.
The slope surface soil retaining plate 5 is inclined, one end is a high end, and the other end is a low end.
The double-row anti-slide pile mechanism of action model test device comprises a first anti-slide pile group 1a and a second anti-slide pile group 1b, wherein the first anti-slide pile group 1a is installed in a first anti-slide pile groove 4a on a slope surface retaining plate 5, and the second anti-slide pile group 1b is installed in a second anti-slide pile groove 4b at the tail end of the slope surface retaining plate 5 and is tightly attached to the inner side of a bottom retaining plate 6 b.
The loading device further comprises a reaction frame 7 used for fixing the jack 8, wherein the reaction frame 7 comprises a quadrilateral bottom surface, a quadrilateral top surface and vertical steel pipes used for connecting the bottom surface and the top surface, the steel pipes are arranged at four corners of the bottom surface and the top surface, and the jack 8 is arranged below the top surface in an inverted mode. Be equipped with mounting hole 11 on the top surface, the quantity of mounting hole 11 is 4, and jack 8 passes through mounting hole 11 to be fixed on the top surface. The corresponding position of the jack 8 is provided with a mounting hole, and a bolt penetrates through the mounting hole to fix the jack 8 on the top surface of the reaction frame 7.
One end of the model box is provided with a support frame 2 for fixing a side retaining plate 6a, and the support frame 2 comprises two vertically arranged support columns 2a and a cross beam 2b for connecting the two support columns 2 a. Crossbeam 2b welds in support post 2a upper end, and crossbeam 2b is used for supporting domatic retaining plate 5. The lower end of the support upright post 2a is provided with a square base 2c, and the base 2c plays a role in stabilizing the support upright post 2 a. The supporting upright post 2a is provided with a slot 2d for fixing the side retaining plate 6a, and the width and height of the slot 2d correspond to the thickness and height of the side retaining plate 6 a.
The mold box is provided with a support 3 at the end opposite to the support pillar 2a, and the support 3 comprises a support plate 3b with a support plate groove 4 and a leg 3c below the support plate 3 b. The support 3 is used to support one end of the bottom retaining plate 6b, the side retaining plate 6a and the slope retaining plate 5.
The supporting plate 3b is a quadrilateral plate, and the supporting legs 3c are positioned at four corners of the quadrilateral supporting plate 3 b.
The support plate groove 4 includes a second slide pile groove 4b for fixing the second slide pile group 1b and a bottom retaining plate groove 3a for fixing the bottom barrier 6 b. The size of the supporting plate groove 4 is completely matched with the second slide resistant pile group 1b and the bottom retaining plate 6b, so that the second slide resistant pile group 1b and the bottom retaining plate 6b are guaranteed to be perpendicular to the ground all the time.
An opening is formed in the supporting plate 3b, and the lower portion of the opening is welded with the supporting plate groove 4 a. Adopt the welded purpose to avoid directly setting up the recess on backup pad 3b and cause backup pad 3b plate thickness to increase by a wide margin, increase support 3 and remove the difficulty, reduce model support 3 cost simultaneously.
The included angle between the sliding slope surface soil retaining plate 5 and the horizontal plane is 30 degrees, 45 degrees and 60 degrees.
The high-end bottom that landslide face kept off native board 5 is equipped with the fixed slot, and the fixed slot combines with crossbeam 2b, and is fixed landslide face soil baffle 5's high-end, and its position is injectd through bottom fender native board 6b or second anti slide pile group 2b to the low end.
The first anti-slide pile group 1a is positioned on the landslide surface soil retaining plate 5 and is away from the lower end 1/5 of the landslide surface soil retaining plate 5; and a first slide-resistant pile groove 4a for installing the first slide-resistant pile group 1a is arranged at the corresponding position of the slide surface retaining plate 5.
In this embodiment, the number of slide resistant piles of the first slide resistant pile group 1a is 2, and the number of slide resistant piles of the second slide resistant pile group 1b is 3.
The soil containing space is also internally provided with a soil pressure box 9, the soil pressure box 9 is embedded at the designed position of the test soil body and is connected with a static strain gauge so as to obtain the soil pressure change data around the anti-slide pile in the test process.
And the soil containing space is also internally provided with a resistance strain gauge, the resistance strain gauge is adhered to the designed position of the surface of the pile body of the anti-slide pile and is connected with a static strain gauge so as to obtain the stress data of the pile body in the test process.
The slide-resistant pile is a cuboid slide-resistant pile manufactured according to a similar principle.
The utility model discloses the device can monitor the soil pressure change law of the experimental soil body in level (the direction that is on a parallel with the horizontal plane) and vertical (the direction of perpendicular to horizontal plane promptly) two directions.
The soil pressure box is a strain type sensor for measuring soil pressure, and is mainly used for measuring the pressure change of soil body at any point in the soil body, and can also be used for measuring the contact pressure of the soil body on the surfaces of a retaining wall, an anti-slide pile and the like, and the numerical value can be measured and calculated by a static strain gauge.
The static strain gauge adopts a DH-3816 type static strain test system which is stable and accurate in monitoring result.
Example 2
In order to research the soil pressure development and evolution law of the soil body around the pile under the action of external load and the corresponding stress law of the pile body, the application also provides a double-row anti-slide pile action mechanism model test method, which comprises the following steps:
(I) constructing double-row anti-slide pile mechanism analysis model
Sticking resistance type strain gauges on the designed positions of the pile body surface, sequentially assembling a double-row anti-slide pile action mechanism model test device, pouring a test soil body into a soil containing space in a grading manner, burying a soil pressure box 9 into the designed positions at different filling heights, tamping by using a tamping device, and repeating the steps until the designed filling height is reached; flatly placing a loading plate 12 above a soil body, and finely adjusting the position of a reaction frame 7 to ensure that a jack 8 is over against the loading plate 12;
(II) test
Removing the bottom retaining plate 6 b; the test soil body 10 is loaded in a grading way through the jack 8 until the soil body around the anti-slide pile group 1 is damaged; and respectively acquiring the soil pressure value of the soil pressure box 9 and the strain value of the pile body surface resistance strain gauge by using a static strain gauge in the loading process. Adjusting the angle of the slope surface soil retaining plate 5, and repeating the test; adjusting different arrangement forms (such as parallel arrangement or triangular arrangement) or different row distances of the double-row anti-slide pile group 1, and repeating the test;
(III) analysis of test results
After the test loading is finished, analyzing data collected by the static strain gauges under different landslide surface retaining plate 5 angles, different arrangement forms of the double-row anti-slide pile group 1 and different row spacing working conditions, and thus obtaining the soil pressure development change rule of soil around the pile under the landslide thrust action and the stress condition of the pile body of the corresponding anti-slide pile group 1 under the soil pressure action.
The soil pressure around the anti-slide pile group 1 is obtained by reading the strain generated by a strain type soil pressure box 9 buried in the soil body through a static strain gauge and calculating the soil pressure of the point according to the elastic modulus of the soil pressure box 9. The soil pressure development change rule of the measuring point can be obtained by comparing the soil pressures of the same soil pressure box 9 under different loads under the same working condition; the soil pressure change rule of the anti-slide pile group 1 along the same horizontal plane under the effect of the soil arch effect can be obtained by comparing the soil pressure data of different soil pressure boxes 9 on the same horizontal plane under the same working condition; the soil pressure change rule of the anti-slide pile group 1 along the same vertical plane under the effect of the soil arch effect can be obtained by comparing the soil pressure data of different soil pressure boxes 9 on the same vertical plane under the same working condition. The stress of the pile body of the anti-slide pile group 1 is obtained by reading the strain value of the resistance strain gauge adhered to the designed position on the surface of the anti-slide pile group 1 through a static strain gauge and calculating the stress data of the pile body at the point according to the elastic modulus of the pile body. The most dangerous section position of the slide-resistant pile group 1 can be determined by comparing different pile body position stress conditions, and the pile body stress change rule under different working conditions can be obtained.
Through the data analysis, the soil pressure and the pile body stress change rule of the anti-slide pile group 1 at different positions and different loading grades in the whole process from generation to damage of the soil arch under different working conditions can be obtained, so that guidance suggestions are provided for the optimal design of the anti-slide pile group in the actual engineering, and more importantly, theoretical basis and technical support can be provided for establishing a wider double-row anti-slide pile design calculation method through the action mechanism of the double-row anti-slide pile obtained through the data analysis.
The double-row anti-slide pile action mechanism model test device comprises the following specific steps: the support frame 2 is firstly placed in an aligned mode, the support 3 and the reaction frame 7 are placed in an aligned mode, the jack 8 is well fixed on the upper portion of the reaction frame 7 through the mounting hole 11 through bolts, then the slope retaining plate 5 is obliquely lapped on the cross beam 2b of the support frame 2 and the support plate 3b of the support 3, one ends of the retaining plates 6b on two sides are inserted into the slots 2d of the support upright posts 2a, the other ends of the retaining plates are lapped on the support plate 3b of the support 3, the anti-slide pile groups 1 are respectively inserted into corresponding positions in the first anti-slide pile grooves 4a of the slope retaining plate 5 and the second anti-slide pile grooves 4b of the support 3, and the bottom retaining plate 6b is inserted into the bottom retaining plate grooves 3a of the support 3.
The test soil 10 is poured in several times and tamped, and the soil pressure box 9 is buried at the designed position. The purpose of compacting the soil is to increase the compaction of the soil and to prevent uneven stressing of the soil pressure cell 9.
The number of the soil pressure boxes 9 is 42, and the arrangement mode is shown in figure 11. The arrangement mode of the soil pressure cell 9 on one side of the first anti-slide pile group 1a is as follows: the number of the soil pressure boxes is three, each layer is 8, 5 and 5 respectively, and 18 soil pressure boxes 9 are required to be buried; the earth pressure cell 9 on one side of the second slide-resistant pile group 1b is arranged in the following way: the soil pressure cell has three layers, each layer is respectively 13, 8 and 3, and the total number is 24. The arrangement mode of the soil pressure box 9 can ensure that the soil pressure change data of the tested soil body in the horizontal direction and the vertical direction can be monitored simultaneously.
The rammer is a rammer weighing 2.5kg and is used for ramming the test soil body 10. The rammer includes a cylindrical solid handle, and square base is welded to handle one end, can be used to obtain required different soil body compactness in the experiment, and is easy and simple to handle and repeatedly usable. The drop distance of the rammer is 5cm, and the rammer is rammed for 1-3 times after filling soil each time.
The height of the test soil body 10 is flush with the cross beam 2b of the support frame 2.
The distance between the adjacent slide-resistant piles in the same slide-resistant pile group is arranged between the slide-resistant pile rows.
Example 3
The utility model discloses single slide pile mechanism of action model test device and embodiment 1 the difference characterized in that of device, single slide pile mechanism of action model test device's slide pile only has 1 group, and is located the domatic fender soil board of sliding. The number of the anti-slide piles of the single-row anti-slide pile group is 3-4. The remaining features are the same as in example 1. The change rule of the soil pressure development of the soil body around the pile under the action of the external load of the slide-resistant pile group is researched, and the action mechanism of the single-row slide-resistant pile is disclosed by adopting the method in the embodiment 2.
Claims (10)
1. The single-row or double-row anti-slide pile mechanism model test device is characterized by comprising a model box and a loading device,
the model box comprises an inclined slide surface soil retaining plate (5), side soil retaining plates (6a) are vertically arranged on two sides of the slide surface soil retaining plate (5), a bottom soil retaining plate (6b) is vertically arranged at the bottom end of the slide surface soil retaining plate (5), and a loading plate (12) is horizontally arranged above the slide surface soil retaining plate (5); the landslide surface soil retaining plate (5), the two side soil retaining plates (6a), the bottom soil retaining plate (6b) and the loading plate (12) jointly form a soil containing space;
one or two sets of anti-slide pile groups (1) are vertically arranged in the soil containing space, and the loading device comprises a jack (8) for applying force to a loading plate (12).
2. The single-row or double-row anti-slide pile mechanism of action model test device according to claim 1, characterized in that the loading device further comprises a reaction frame (7) for fixing the jack (8), the reaction frame (7) comprises a quadrangular bottom surface and a quadrangular top surface and vertical steel pipes for connecting the bottom surface and the top surface, the steel pipes are arranged at four corners of the bottom surface and the top surface, and the jack (8) is arranged upside down below the top surface.
3. The single-row or double-row slippile mechanism of action model test device according to claim 1, characterized in that one end of the model box is provided with a support frame (2) for fixing a side soil guard (6a), and the support frame (2) comprises two vertically arranged support columns (2a) and a cross beam (2b) connecting the two support columns.
4. The single-row or double-row slippile mechanism of action model test device according to claim 3, characterized in that the supporting columns (2a) are provided with slots (2d) for fixing the side retaining plates (6a), and the width and height of the slots (2d) correspond to the thickness and height of the side retaining plates (6 a).
5. The single-row or double-row slippile mechanism model test device according to claim 3, characterized in that the mold box is provided with a support (3) at the end opposite to the support post (2a), and the support (3) comprises a support plate (3b) and a leg (3c) below the support plate (3 b).
6. The single-row or double-row anti-slide pile mechanism of action model test device as claimed in claim 1, wherein the included angle between the slope surface retaining plate (5) and the horizontal plane is 30-60 °.
7. The single-row or double-row slide-resistant pile mechanism of action model test device according to claim 6, characterized in that the included angle between the slide surface retaining plate (5) and the horizontal plane is 30 °, 45 °, 60 °.
8. The single-row or double-row anti-slide pile mechanism of action model test device according to claim 1, characterized in that the soil containing space further comprises a soil pressure cell (9) and a resistance strain gauge attached to the surface of the anti-slide pile group (1), the soil pressure cell (9) is embedded at the design position of the test soil body, the resistance strain gauge is attached to the design position of the pile body surface and is connected with a static strain gauge, so as to obtain the soil pressure of the soil body between the anti-slide piles and the stress data of the pile body of the anti-slide pile group (1).
9. The single-row or double-row slide-resistant pile mechanism of action model test device according to claim 1, wherein the double-row slide-resistant pile comprises a first slide-resistant pile group and a second slide-resistant pile group, the first slide-resistant pile group is installed in a first slide-resistant pile groove on a slope surface retaining plate, and the second slide-resistant pile group is installed in a second slide-resistant pile groove at the tail end of the slope surface retaining plate and clings to the inner side of the bottom retaining plate.
10. The single-row or double-row slide-resistant pile mechanism of action model test device according to claim 9, wherein the number of slide-resistant piles of the first slide-resistant pile group is 2-3; the number of the slide-resistant piles of the second slide-resistant pile group is 3-4.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110284532A (en) * | 2019-05-31 | 2019-09-27 | 山东建筑大学 | Single or double friction pile mechanism of action model test apparatus and test method |
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