CN112254912B - Multilayer underground structure anti-seismic push-cover test equipment and pseudo-dynamic loading method - Google Patents
Multilayer underground structure anti-seismic push-cover test equipment and pseudo-dynamic loading method Download PDFInfo
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- CN112254912B CN112254912B CN202011151087.4A CN202011151087A CN112254912B CN 112254912 B CN112254912 B CN 112254912B CN 202011151087 A CN202011151087 A CN 202011151087A CN 112254912 B CN112254912 B CN 112254912B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a multi-layer underground structure anti-seismic pushing test device which comprises a multi-layer underground structure anti-seismic pushing test device, wherein the multi-layer underground structure anti-seismic pushing test device comprises a vertical reaction wall and a reaction wall base, the vertical reaction wall is vertically arranged, the reaction wall base is horizontally arranged at the bottom of the vertical reaction wall, the vertical reaction wall and the reaction wall base are integrally formed, a plurality of groups of positioning slotted holes are uniformly formed in the surface of the vertical reaction wall, a plurality of groups of actuating mechanisms are axially and horizontally fixed on the inner side of the vertical reaction wall, a plurality of groups of bolts are fixed at the joint of the actuating mechanisms and the positioning slotted holes, and two groups of ground beams are symmetrically arranged on the. The invention can realize interlayer dynamic displacement coordination loading of a multilayer underground structure, replaces upper soil covering pressure by the upper flexible lead plate, simulates a Wenkel foundation by the lower rubber pad, realizes a large model test system and method for earthquake reaction of the multilayer underground structure under the action of transverse strong earthquake load, and improves the accuracy of experimental data.
Description
Technical Field
The invention relates to the technical field of earthquake resistance, in particular to multilayer underground structure earthquake resistance push-cover test equipment and a pseudo-dynamic loading method.
Background
With the rapid development of urban subways and underground overall construction in China, the earthquake-resistant problem of underground structures causes wide attention of engineering and academic circles. Especially, in 1995, osaka god caused serious earthquake damage to underground station structures and inter-zone tunnels of a large number of subways, and attention of global engineering technicians is attracted, and it is generally considered that the earthquake-resistant performance of the underground structures under complex engineering geological environments needs to be fully paid attention and necessary measures are taken in engineering construction. However, at present, the relevant theories and calculation methods for earthquake resistance of underground structures need to be further researched, and relevant conclusions and understanding need to be verified by effective model test means. At present, the earthquake-proof model test of the underground structure mainly comprises a vibration table test in a normal gravity state and a centrifugal machine vibration table test in a hypergravity state.
However, the two model test methods of the conventional vibration table test in the normal gravity state and the centrifugal machine vibration table test in the hypergravity state have the following problems in the actual operation process: the two model test methods both need to carry out model test design of a complex soil and underground structure interaction system, have the limitations that the similarity ratio cannot be unified, the model foundation is difficult to prepare, the model structure size is small and the like, and the earthquake damage process and the collapse form of the underground structure cannot be visually and truly reproduced.
Disclosure of Invention
The invention aims to provide a multi-layer underground structure earthquake-resistant push-cover test device and a pseudo-dynamic loading method, and solves the technical problems that model test design of a complex soil and underground structure interaction system is required in a vibration table test in a normal gravity state and a centrifugal machine vibration table test in a hypergravity state, the similarity ratio cannot be unified, the model foundation is difficult to prepare, the size of a model structure is small, and the earthquake damage process and the collapse form of the underground structure cannot be visually and truly reproduced.
In order to achieve the purpose, the invention provides the following technical scheme: a multi-layer underground structure anti-seismic pushing-covering test device comprises a multi-layer underground structure anti-seismic pushing-covering test device, wherein the multi-layer underground structure anti-seismic pushing-covering test device comprises a vertically arranged reaction wall vertical wall and a reaction wall base horizontally arranged at the bottom of the reaction wall vertical wall, the reaction wall vertical wall and the reaction wall base are integrally formed, a plurality of groups of positioning groove holes are uniformly formed in the surface of the reaction wall vertical wall, a plurality of groups of actuating mechanisms are axially and horizontally fixed on the inner side of the reaction wall vertical wall, a plurality of groups of bolts are fixed at the joint of the actuating mechanisms and the positioning groove holes, two groups of ground beams are symmetrically arranged on the reaction wall base through the bolts, a multi-layer underground structure model is arranged between the two groups of ground beams, rubber pads are laid on the bottom of the multi-layer underground structure model and the surface of the reaction wall base, a plurality of groups sub-underground structure layer from the top down equidistance sets up and integrated into one piece, a plurality of groups sub-underground structure layer and a plurality of groups actuate the setting of mechanism one-to-one, the bilateral symmetry of sub-underground structure layer is provided with two sets of I-steel, is located the inboard the I-steel with actuate mechanism fixed connection, it is two sets of the periphery of I-steel evenly is connected with four groups and embraces the pole, sub-underground structure layer is located between four groups of insides of embracing the pole, is located the top sub-underground structure layer is improved level and is spread and is covered flexible lead plate.
In a preferred embodiment of the present invention, the actuating mechanism includes a base fixed on the vertical wall of the reaction wall and a servo actuator horizontally fixed on the base, and a power output end of the servo actuator is fixedly connected to the i-steel.
As a preferable embodiment of the invention, the rubber pad is of a U-shaped structure, and two sides of the rubber pad are positioned between the ground beam and the multi-layer underground structure model.
As a preferred embodiment of the present invention, a support sidewall is connected between two adjacent sub-underground structure layers, and the sub-underground structure layers and the support sidewall are integrally formed.
As a preferred embodiment of the invention, two groups of support columns are connected inside two groups of sub-underground structure layers which are adjacent up and down, and the two groups of support columns are arranged in bilateral symmetry.
As a preferred embodiment of the present invention, the specific loading steps are as follows:
the method comprises the following steps: the multi-layer underground structure anti-seismic pushing and covering test equipment is positioned and installed: a plurality of groups of actuating mechanisms corresponding to the actuating mechanisms are uniformly arranged according to the height of each layer of the multi-layer underground structure model, each group of actuating mechanisms and the inner sub-underground structure layer are positioned at the same horizontal height, the two sides of the sub-underground structure layer are in butt joint installation through I-steel and holding rods, the sub-underground structure layer is subjected to outer frame fixation, and ground beams are arranged on the two sides of the bottom of the multi-layer underground structure model for fixation, so that the aim of positioning and installation of the multi-layer underground structure anti-seismic push-cover test equipment is fulfilled;
step two: the multi-layer underground structure anti-seismic pushing and covering test equipment simulates dynamic seismic operation: the servo actuators of a plurality of groups actuating mechanism are connected with an external power supply to operate, the earthquake intensity simulated as required and the corresponding adjusting power are realized, the comprehensive vibration simulation of all parts of a multi-layer underground structure model is realized through the actuating mechanisms of a plurality of groups, in addition, the weight of a flexible lead plate is passed as required, so that the purpose of regulating the overburden soil pressure of the simulated underground structure is realized, the data of a simulation test is recorded and compared, and the earthquake damage process and the collapse form of the underground structure can be observed and tested visually.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the multi-layer underground structure earthquake-resistant push-cover test equipment and the pseudo-dynamic loading method, the large reaction wall is designed to be connected with the holding rod of the actuator of each layer of the multi-layer underground structure, interlayer dynamic displacement coordinated loading of the multi-layer underground structure is achieved, the upper portion earth covering pressure is replaced by the upper flexible lead plate, the lower rubber pad is arranged to simulate a Weckel foundation, a large model test system and method for earthquake reaction of the multi-layer underground structure under the action of transverse strong earthquake load are achieved, and accuracy of test data is improved.
2. The multi-layer underground structure earthquake-resistant push-cover test equipment and the quasi-dynamic loading method provided by the invention avoid the defect that the similarity ratio of a soil and structure dynamic interaction system cannot be unified, can simulate the dynamic interaction of a large-scale multi-layer underground structure lateral foundation and an underground structure through the coordinated cyclic loading of a plurality of actuators arranged on a counterforce wall, and can visually observe and test the earthquake damage process and the collapse form of the underground structure.
Drawings
FIG. 1 is an elevation view of a multi-layer underground structure seismic push-cover test system of the invention.
In the figure, 1, a vertical wall of a counterforce wall; 2. a counterforce wall base; 3. positioning the slotted hole; 4. an actuating mechanism; 5. a bolt; 6. a ground beam; 7. a multi-layer underground structure model; 8. a rubber pad; 9. a sub-subterranean formation; 10. i-shaped steel; 11. holding the pole; 12. a flexible lead plate; 13. a base; 14. a servo actuator; 15. supporting the side walls; 16. and (4) a support column.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a multi-layer underground structure anti-seismic pushing-covering test device comprises a multi-layer underground structure anti-seismic pushing-covering test device, the multi-layer underground structure anti-seismic pushing-covering test device comprises a reaction wall vertical wall 1 and a reaction wall base 2, the reaction wall vertical wall 1 and the reaction wall base 2 are vertically arranged, the surface of the reaction wall vertical wall 1 is uniformly provided with a plurality of groups of positioning slotted holes 3, the inner side of the reaction wall vertical wall is axially and horizontally fixed with a plurality of groups of actuating mechanisms 4, the butt joint of the actuating mechanisms 4 and the positioning slotted holes 3 is fixed with a plurality of groups of bolts 5, two groups of ground beams 6 are symmetrically arranged on the reaction wall base 2 through the bolts 5, a multi-layer underground structure model 7 is arranged between the two groups of ground beams 6, a rubber pad 8 is laid on the bottom of the multi-layer underground structure model 7 and the surface of the reaction wall base 2, the multi-layer underground structure model, the plurality of groups of sub underground structure layers 9 are arranged in one-to-one correspondence with the plurality of groups of actuating mechanisms 4, two groups of I-beams 10 are symmetrically arranged on two sides of each sub underground structure layer 9, the I-beams 10 positioned on the inner side are fixedly connected with the actuating mechanisms 4, four groups of holding rods 11 are uniformly connected to the peripheries of the two groups of I-beams 10, the sub underground structure layers 9 are positioned between the four groups of holding rods 11, and flexible lead plates 12 are horizontally paved on the sub underground structure layers 9 positioned on the top.
Further improved, as shown in fig. 1: the actuating mechanism 4 comprises a base 13 fixed on the vertical wall 1 of the reaction wall and a servo actuator 14 horizontally fixed on the base 13, the power output end of the servo actuator 14 is fixedly connected with the I-shaped steel 10, and the earthquake condition is simulated through the power of the servo actuator 14.
Further improved, as shown in fig. 1: rubber pad 8 is U type structure, and the both sides of rubber pad 8 are located between grade beam 6 and the multilayer underground structure model 7, through setting up rubber pad 8 simulation wenke's ground down.
Further improved, as shown in fig. 1: and a supporting side wall 15 is connected between two adjacent sub-underground structure layers 9, and the sub-underground structure layers 9 and the supporting side walls 15 are integrally formed.
Further improved, as shown in fig. 1: two groups of support columns 16 are connected inside the upper and lower adjacent sub underground structure layers 9, and the two groups of support columns 16 are arranged in bilateral symmetry.
When in use: specifically, the loading steps are as follows:
the method comprises the following steps: the multi-layer underground structure anti-seismic pushing and covering test equipment is positioned and installed: a plurality of groups of actuating mechanisms 4 corresponding to the groups of actuating mechanisms are uniformly arranged according to the height of each layer of the multi-layer underground structure model 7, each group of actuating mechanisms 4 is at the same horizontal height with the inner sub-underground structure layer 9, the two sides of the sub-underground structure layer 9 are in butt joint installation through I-steel 10 and holding rods 11, the sub-underground structure layer 9 is subjected to outer frame fixation, and the ground beams 6 are arranged on the two sides of the bottom of the multi-layer underground structure model 7 for fixation, so that the aim of positioning and installation of the multi-layer underground structure anti-seismic push-cover test equipment is fulfilled;
step two: the multi-layer underground structure anti-seismic pushing and covering test equipment simulates dynamic seismic operation: the servo actuators 14 of the actuating mechanisms 4 of a plurality of groups are externally connected with a power supply to operate, the corresponding adjusting power is realized according to the earthquake intensity to be simulated, the comprehensive vibration simulation of all parts of the multi-layer underground structure model 7 is realized through the actuating mechanisms 4 of a plurality of groups, in addition, the weight of the flexible lead plate 12 is passed through according to the needs, so that the purpose of simulating the overburden soil pressure of the underground structure is adjusted, the data of a simulation test is recorded and compared, and the earthquake damage process and the collapse form of the underground structure can be visually observed and tested.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The utility model provides a multilayer underground structure antidetonation is pushed away and is covered experimental equipment, includes that multilayer underground structure antidetonation pushes away and covers testing arrangement, its characterized in that: the multi-layer underground structure anti-seismic pushing and covering test device comprises a vertical reaction wall (1) and a reaction wall base (2) which is horizontally arranged at the bottom of the vertical reaction wall (1), the vertical reaction wall (1) and the reaction wall base (2) are integrally formed, a plurality of groups of positioning slotted holes (3) are uniformly formed in the surface of the vertical reaction wall (1), a plurality of groups of actuating mechanisms (4) are axially and horizontally fixed on the inner side of the vertical reaction wall, a plurality of groups of bolts (5) are fixed at the butt joint of the actuating mechanisms (4) and the positioning slotted holes (3), two groups of ground beams (6) are symmetrically installed on the reaction wall base (2) through the bolts (5), a multi-layer underground structure model (7) is arranged between the two groups of ground beams (6), and rubber pads (8) are laid on the bottom of the multi-layer underground structure model (7) and the surface of the reaction wall base (2), the multilayer underground structure model (7) is composed of a plurality of groups of sub underground structure layers (9), the sub underground structure layers (9) and the actuating mechanisms (4) of the groups are arranged in a one-to-one correspondence mode, two groups of I-shaped steel (10) are symmetrically arranged on two sides of each sub underground structure layer (9), the I-shaped steel (10) positioned on the inner side is fixedly connected with the actuating mechanisms (4), four groups of holding rods (11) are uniformly connected to the peripheries of the two groups of I-shaped steel (10), the sub underground structure layers (9) are positioned between the four groups of holding rods (11), and flexible lead plates (12) are horizontally laid on the sub underground structure layers (9) positioned on the top;
the actuating mechanism (4) comprises a base (13) fixed on the vertical wall (1) of the reaction wall and a servo actuator (14) horizontally fixed on the base (13), and the power output end of the servo actuator (14) is fixedly connected with the I-shaped steel (10);
the rubber pad (8) is of a U-shaped structure, and two sides of the rubber pad (8) are positioned between the ground beam (6) and the multi-layer underground structure model (7);
a supporting side wall (15) is connected between every two adjacent sub-underground structure layers (9), and the sub-underground structure layers (9) and the supporting side walls (15) are integrally formed;
the interior of the sub-underground structure layer (9) is connected with two groups of supporting columns (16), and the two groups of supporting columns (16) are arranged in a bilateral symmetry mode.
2. The pseudo-dynamic loading method of the multi-layer underground structure earthquake-resistant push-cover test equipment according to claim 1, characterized in that: the specific loading steps are as follows:
the method comprises the following steps: the multi-layer underground structure anti-seismic pushing and covering test equipment is positioned and installed: according to the height of each layer of the multilayer underground structure model (7), a plurality of groups of actuating mechanisms (4) corresponding to the groups of actuating mechanisms are uniformly arranged, each group of actuating mechanisms (4) is at the same horizontal height with the inner sub-underground structure layer (9), the two sides of the sub-underground structure layer (9) are in butt joint installation through I-shaped steel (10) and holding rods (11), the sub-underground structure layer (9) is subjected to outer frame fixation, and ground beams (6) are arranged on the two sides of the bottom of the multilayer underground structure model (7) for fixation, so that the aim of positioning and installation of the multilayer underground structure anti-seismic push-cover test equipment is fulfilled;
step two: the multi-layer underground structure anti-seismic pushing and covering test equipment simulates dynamic seismic operation: the servo actuators (14) of a plurality of groups of actuating mechanisms (4) are externally connected with a power supply to operate, the corresponding adjusting power is realized according to the seismic intensity to be simulated, the comprehensive vibration simulation of all parts of a multilayer underground structure model (7) is realized through the multiple groups of actuating mechanisms (4), in addition, the weight of the flexible lead plate (12) is passed through as required, so that the purpose of simulating the overburden pressure of the underground structure is adjusted, the data of a simulation test is recorded and compared, and the earthquake damage process and the collapse form of the underground structure can be observed and tested visually.
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| CN112781977A (en) * | 2021-01-27 | 2021-05-11 | 武汉理工大学 | Counter force type laminated shearing model box |
| CN113722793A (en) * | 2021-08-16 | 2021-11-30 | 南京工业大学 | Underground structure seismic performance and seismic vulnerability analysis method and modeling system |
| CN114705386B (en) * | 2022-02-25 | 2024-03-01 | 河海大学 | Quasi-static force anti-seismic test device and test method for long tunnel structure |
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