Karst pile foundation anti-seismic test device

Abstract

The utility model discloses a karst pile foundation anti-seismic test device which comprises a vibration table, a stacked frame, a sliding mechanism, an anti-seepage flexible rubber membrane and a detection mechanism, the vibration table is vertically provided with four elastic columns, and the four elastic columns are arranged at the four corners of a rectangle respectively; four corners of the frame single bodies are respectively connected with the four elastic columns, the lowest frame single body is fixedly connected with the vibration table, and the test filling cavity is used for filling a soil body; any two adjacent layers of frame single bodies are connected through a sliding mechanism so that the two layers of frame single bodies can relatively slide in the horizontal direction. The transparent anti-seepage flexible rubber film is laid in the test filling cavity and is attached to the cavity wall of the test filling cavity; and the detection mechanism is arranged in the soil body to detect parameters of the soil body so as to represent the test condition of the anti-seismic test. The karst pile foundation anti-seismic test device can solve the problems that an existing karst pile foundation anti-seismic test device is large in boundary fluctuation reflection and not ideal in test effect under the non-uniform seismic excitation condition.

Description

Technical Field

[0001] The utility model relates to the technical field of earthquake resistance testing, in particular to an earthquake resistance testing device for a karst pile foundation. Background Art

[0002] In order to simulate, characterize and analyze the seismic performance of lava pile foundations under earthquake excitation, karst pile foundation seismic test equipment came into being. Existing karst pile foundation seismic test equipment generally adopts a combination structure of a vibration table and a box, which fixes the box on the table of the vibration table, and then fills the box with various types of soil to simulate different soil conditions, and then sets the detection piles, strain gauges and other data acquisition mechanisms in the filled soil. After the setting is completed, the vibration table is used to simulate the earthquake excitation situation, and the experimenters' naked eye observation and the data of each data acquisition mechanism are comprehensively analyzed to characterize the seismic performance under different soils and different vibration conditions.

[0003] The existing karst pile foundation seismic test equipment still has the following problems during use: (1) The boundary effect caused by the large wave reflection at the boundary makes it difficult to reflect the actual seismic response of the soil layer; (2) Due to its integrity, the test effect under non-uniform seismic excitation is not ideal; (3) Due to the problem of the natural frequency of the box, it is difficult to adapt to the shaking table test of different types of soil. Utility Model Content

[0004] The utility model aims to provide a karst pile foundation seismic test device, which can solve the problems of large boundary wave reflection and unsatisfactory test effect under non-uniform earthquake excitation in the existing karst pile foundation seismic test device.

[0005] The utility model is realized by the following technical solutions:

[0006] A karst pile foundation seismic test device comprises a vibration table, wherein the vibration table is vertically provided with four elastic columns, and the four elastic columns are respectively arranged at the four corners of a rectangle; a stacked frame, comprising stacked multi-layer frame monomers, the frame monomers are rectangular frames, the four corners of the frame monomers are respectively connected to the four elastic columns, and the frame monomers located at the bottom are fixedly connected to the vibration table, so that a test filling cavity is formed by the stacked frame and the table surface of the vibration table, and the test filling cavity is used to fill soil; a sliding mechanism, any two adjacent layers of the frame monomers are connected by the sliding mechanism, so that the two layers of the frame monomers can slide relative to each other in the horizontal direction; an anti-seepage flexible rubber membrane, wherein the transparent anti-seepage flexible rubber membrane is laid in the test filling cavity and fits with the cavity wall of the test filling cavity; a detection mechanism, wherein the detection mechanism is arranged in the soil to detect soil parameters to characterize the test conditions of the seismic test.

[0007] Optionally, the frame monomer includes four L-shaped bodies and four elastic rods, and two ends of the L-shaped body are respectively connected to one of the elastic rods to surround and form the rectangular frame-shaped frame monomer; the four L-shaped bodies are respectively connected to four elastic columns.

[0008] Optionally, the elastic rod includes a pair of hard segments and an elastic segment, the elastic segment is sandwiched between the two hard segments and coaxially connected to the hard segment; one end of the hard segment away from the elastic segment is connected to the end of the L-shaped body.

[0009] Optionally, the elastic section is a spring.

[0010] Optionally, the end of the elastic rod is slidably connected to the L-shaped body along the axial direction.

[0011] Optionally, the L-shaped body is provided with sliding grooves along two right-angled sides respectively, the sliding grooves are slidably connected with sliders, and the ends of the elastic rods are connected to the sliders.

[0012] Optionally, the sliding mechanism includes multiple groups of sliding fittings, and the sliding fittings include ball bearings and groove seats; at least one groove seat is provided on the bottom surface of each L-shaped body, and a sliding groove is opened on the bottom surface of the groove seat. The ball bearings roll in the sliding groove, and the frame monomer located on the upper layer slides with the frame monomer located on the lower layer through the ball bearings.

[0013] Optionally, a plurality of screw holes are distributed in an array on the table top of the vibration table, and an external thread is formed at the bottom end of the elastic column, so that the elastic column can be screwed to any of the screw holes.

[0014] Optionally, the waterproof flexible rubber film is a transparent film, and the stacked frame is a transparent frame.

[0015] Optionally, the detection mechanism includes a detection pile, multiple strain gauges, several accelerometers and several piezometers; the bottom end of the detection pile is detachably connected to the table top of the vibration table, and the detection pile is used to be vertically buried in the soil in the test filling cavity; the strain gauge is buried at the point to be tested in the soil, or is arranged on the detection pile.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] The utility model provides a karst pile foundation seismic test device, which provides a vibration table, and vertically provides four elastic columns on the vibration table, so that the four elastic columns are respectively located at the four corners of a rectangle, and a stacked frame is provided on this basis, which fundamentally avoids the unsatisfactory test effect of the integrated box under the condition of non-uniform earthquake excitation, and makes the four corners of each layer of frame monomers of the stacked frame connected to the four elastic columns respectively, and utilizes the four elastic columns to ensure the integrity of the stacked frame, and when vibrating, utilizes the elasticity of the elastic columns to reduce the influence of the boundary effect of the stacked frame, and because each layer of the frame monomers is respectively connected to the elastic columns, the continuity of the stacked frame when it is subjected to vibration can be effectively improved; on this basis, By setting a sliding mechanism, any two adjacent frame monomers are connected through the sliding mechanism, further improving the smoothness of the shaking of the stacked frame when subjected to vibration and the timeliness of the response; on this basis, by setting an impermeable flexible rubber membrane, the soil is isolated from the stacked frame to prevent leakage from between the layers of the stacked frame during soil vibration; on this basis, by setting a detection mechanism to characterize the test conditions of the seismic test, a data basis is provided for subsequent analysis; through the mutual coordination of the above-mentioned features, the karst pile foundation seismic test device can effectively solve the problems of large boundary wave reflection of the existing karst pile foundation seismic test device and unsatisfactory test effect under non-uniform earthquake excitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0019] Figure 1 A schematic diagram of a karst pile foundation seismic test device provided by an embodiment of the utility model;

[0020] Figure 2 A schematic front view of a karst pile foundation seismic test device provided by an embodiment of the utility model;

[0021] Figure 3 A schematic diagram of an elastic column of a karst pile foundation seismic test device provided by an embodiment of the utility model;

[0022] Figure 4 A schematic diagram of a slideway of a karst pile foundation seismic test device provided by an embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the karst pile foundation seismic test device provided in an embodiment of the utility model after being filled with soil.

[0024] Marks and corresponding parts names in the attached drawings:

[0025] 10-vibration table; 101-screw hole; 11-elastic column; 20-frame monomer; 21-L-shaped body; 211-slideway; 22-elastic rod; 221-hard section; 222-elastic section; 30-ball; 31-slot seat; 40-test pile; 41-strain gauge. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0027] Example

[0028] Please refer to Figures 1 to 5 The present embodiment provides a karst pile foundation seismic test device, comprising a vibration table 10, wherein the vibration table 10 is vertically provided with four elastic columns 11, and the four elastic columns 11 are respectively arranged at the four corners of a rectangle; the second embodiment comprises a stacked frame, comprising a stacked multi-layer frame monomer 20, wherein the frame monomer 20 is a rectangular frame, and the four corners of the frame monomer 20 are respectively connected to the four elastic columns 11, and the frame monomer 20 located at the bottom is fixedly connected to the vibration table 10, so as to surround the stacked frame and the table surface of the vibration table 10. A test filling cavity is formed, and the test filling cavity is used to fill the soil; the third includes a sliding mechanism, and any two adjacent layers of the frame monomers 20 are connected by the sliding mechanism so that the two layers of the frame monomers 20 can slide relative to each other in the horizontal direction; the fourth includes an anti-seepage flexible rubber membrane (not shown), and the transparent anti-seepage flexible rubber membrane is laid in the test filling cavity and fits with the cavity wall of the test filling cavity; the fifth includes a detection mechanism, and the detection mechanism is arranged in the soil to detect the parameters of the soil to characterize the test conditions of the seismic test.

[0029] The karst pile foundation seismic test device provided in the present embodiment is provided with a vibration table 10, and four elastic columns 11 are vertically provided on the vibration table 10, so that the four elastic columns 11 are respectively located at the four corners of the rectangle, and a stacked frame is provided on this basis, fundamentally avoiding the unsatisfactory test effect of the integrated box under the condition of non-uniform earthquake excitation, and the four corners of each layer of frame monomers 20 of the stacked frame are respectively connected to the four elastic columns 11, and the four elastic columns 11 are used to ensure the integrity of the stacked frame. When vibrating, the elasticity of the elastic columns 11 is used to reduce the influence of the boundary effect of the stacked frame, and because each layer of the frame monomers 20 is respectively connected to the elastic columns 11, the continuity of the stacked frame when it is subjected to vibration can be effectively improved. ; On this basis, by setting a sliding mechanism, any two adjacent layers of frame monomers 20 are connected through the sliding mechanism, further improving the smoothness of the shaking of the stacked frame when subjected to vibration and the timeliness of the response; on this basis, by setting an impermeable flexible rubber membrane, the soil is isolated from the stacked frame to prevent leakage from between the layers of the stacked frame during soil vibration; on this basis, by setting a detection mechanism to characterize the test conditions of the seismic test, a data basis is provided for subsequent analysis; through the mutual coordination of the above-mentioned features, the karst pile foundation seismic test device can effectively solve the problems of large boundary wave reflection of the existing karst pile foundation seismic test device and unsatisfactory test effect under non-uniform earthquake excitation.

[0030] In order to solve the problem that the box has a natural frequency and is difficult to adapt to different types of soil tests, the frame monomer 20 includes four L-shaped bodies 21 and four elastic rods 22, and the two ends of the L-shaped body 21 are respectively connected to an elastic rod 22 to enclose the frame monomer 20 to form a rectangular frame; the four L-shaped bodies 21 are respectively connected to the four elastic columns 11.

[0031] Through the above arrangement, the frame monomer 20 can further adjust, synchronize and eliminate its own frequency through the bending and swinging of the elastic rod 22 while shaking.

[0032] In order to further explain the specific structure of the elastic rod 22, the elastic rod 22 includes a pair of hard segments 221 and an elastic segment 222. The elastic segment 222 is sandwiched between the two hard segments 221 and coaxially connected to the hard segment 221; one end of the hard segment 221 away from the elastic segment 222 is connected to the end of the L-shaped body 21.

[0033] Through the above arrangement, the hard section 221 is convenient to be connected to the L-shaped body 21, and the elastic section 222 is convenient to perform deformation and energy dissipation.

[0034] Preferably, in this embodiment, the elastic section 222 is a spring.

[0035] In order to further improve the energy dissipation performance of the frame monomer 20 , the end of the elastic rod 22 is slidably connected to the L-shaped body 21 along the axial direction.

[0036] Through the above arrangement, when the frame monomer 20 is shaking, it can not only further adjust, synchronize and eliminate its own frequency through the bending and swinging of the elastic rod 22, but also further adjust, synchronize and eliminate its own frequency through the relative sliding of the elastic rod 22 and the L-shaped body 21.

[0037] In order to specifically describe the structure of the sliding connection between the L-shaped body 21 and the elastic rod 22, the L-shaped body 21 is provided with a slide groove 211 along two right-angled sides, and the slide groove 211 is slidably connected with a slider, and the end of the elastic rod 22 is connected to the slider.

[0038] In order to further explain the specific structure of the sliding mechanism, the sliding mechanism includes multiple groups of sliding fittings, and the sliding fittings include ball bearings 30 and groove seats 31; each L-shaped body 21 has at least one groove seat 31 on the bottom surface, and the bottom surface of the groove seat 31 is provided with a sliding groove, and the ball bearings 30 are rolled in the sliding groove, and the frame monomer 20 located on the upper layer is slidingly matched with the frame monomer 20 located on the lower layer through the ball bearings 30.

[0039] Preferably, a plurality of screw holes 101 are distributed in an array on the table surface of the vibration table 10 , and an external thread is formed at the bottom end of the elastic column 11 , so that the elastic column 11 can be screwed to any of the screw holes 101 .

[0040] In order to facilitate naked-eye observation by experimenters, the anti-seepage flexible rubber film is a transparent film, and the stacked frame is a transparent frame.

[0041] In order to give a specific explanation of the detection mechanism, the detection mechanism includes a detection pile 40, a plurality of strain gauges 41, a plurality of accelerometers and a plurality of piezometers; the bottom end of the detection pile 40 is detachably connected to the table top of the vibration table 10, and the detection pile 40 is used to be vertically buried in the soil in the test filling cavity; the strain gauge 41 is buried in the point to be tested in the soil, or is arranged on the detection pile 40.

[0042] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A karst pile foundation seismic test device, characterized in that: include: A vibration table (10), wherein the vibration table (10) is vertically provided with four elastic columns (11), and the four elastic columns (11) are respectively arranged at four corners of a rectangle; A stacked frame comprises a plurality of stacked frame monomers (20), wherein the frame monomers (20) are rectangular frames, the four corners of the frame monomers (20) are respectively connected to the four elastic columns (11), and the frame monomers (20) located at the bottom are fixedly connected to the vibration table (10), so that a test filling cavity is formed by the stacked frame and the table surface of the vibration table (10), and the test filling cavity is used to fill soil; A sliding mechanism, wherein any two layers of the frame monomers (20) arranged adjacent to each other are connected via the sliding mechanism, so that the two layers of the frame monomers (20) can slide relative to each other in a horizontal direction; An anti-seepage flexible rubber membrane, which is laid in the test filling cavity and fits with the cavity wall of the test filling cavity; The detection mechanism is arranged in the soil to detect the parameters of the soil to characterize the test conditions of the seismic test.

2. The karst pile foundation seismic test device according to claim 1, characterized in that: The frame monomer (20) comprises four L-shaped bodies (21) and four elastic rods (22), and two ends of the L-shaped bodies (21) are respectively connected to one of the elastic rods (22) to surround and form the frame monomer (20) in a rectangular frame shape; The four L-shaped bodies (21) are respectively connected to the four elastic columns (11).

3. The karst pile foundation seismic test device according to claim 2, characterized in that: The elastic rod (22) comprises a pair of hard sections (221) and an elastic section (222), wherein the elastic section (222) is sandwiched between the two hard sections (221) and is coaxially connected to the hard section (221); One end of the hard section (221) away from the elastic section (222) is connected to the end of the L-shaped body (21).

4. The karst pile foundation seismic test device according to claim 3, characterized in that: The elastic section (222) is a spring.

5. The karst pile foundation seismic test device according to any one of claims 2 to 4, characterized in that: The end of the elastic rod (22) is slidably connected to the L-shaped body (21) along the axial direction.

6. The karst pile foundation seismic test device according to claim 5, characterized in that: The L-shaped body (21) is provided with sliding grooves (211) along two right-angled sides respectively, the sliding grooves (211) are slidably connected with a sliding block, and the end of the elastic rod (22) is connected to the sliding block.

7. The karst pile foundation seismic test device according to claim 6, characterized in that: The sliding mechanism comprises a plurality of sets of sliding matching parts, and the sliding matching parts comprise rolling balls (30) and groove seats (31); The bottom surface of each L-shaped body (21) is provided with at least one groove seat (31), the bottom surface of the groove seat (31) is provided with a sliding groove, the ball bearings (30) are rollingly arranged in the sliding groove, and the frame monomer (20) located at the upper layer is slidably matched with the frame monomer (20) located at the lower layer through the ball bearings (30).

8. The karst pile foundation seismic test device according to claim 1, characterized in that: The table top of the vibration table (10) is arrayed with a plurality of screw holes (101), the bottom end of the elastic column (11) is provided with an external thread, and the elastic column (11) can be screwed with any of the screw holes (101).

9. The karst pile foundation seismic test device according to claim 1, characterized in that: The anti-seepage flexible rubber film is a transparent film, and the stacked frame is a transparent frame.

10. The karst pile foundation seismic test device according to claim 1, characterized in that: The detection mechanism comprises a detection pile (40), a plurality of strain gauges (41), a plurality of accelerometers and a plurality of pore pressure gauges; The bottom end of the detection pile (40) is detachably connected to the tabletop of the vibration table (10), and the detection pile (40) is used to be vertically buried in the soil in the test filling cavity; The strain gauge (41) is buried at a point to be tested in the soil, or is arranged on the detection pile (40).

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