CN112647535A

CN112647535A - Assembled retaining wall shock attenuation power consumption structure

Info

Publication number: CN112647535A
Application number: CN202011533160.4A
Authority: CN
Inventors: 黄雨; 石昊
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-04-13
Anticipated expiration: 2040-12-22
Also published as: CN112647535B

Abstract

The utility model provides a shock attenuation energy-absorbing structure of assembled retaining wall by assembly fixed plate (1), shock attenuation energy-absorbing unit (2), pressurization fastener (3), compound geotechnological drainage network (4) constitution. The damping and energy-absorbing unit (2) is pressurized by using the assembly fixing plate (1) and the pressurizing fastener (3), so that the internal stress of the damping and energy-absorbing unit is the same as the active soil pressure of the damping and energy-absorbing unit, the composite geotechnical drainage net (4) is ensured not to deform excessively under the action of the soil pressure behind the wall, and the working efficiency of the composite geotechnical drainage net is ensured. When the anti-seismic energy absorption unit is in an earthquake state, the damping energy absorption unit (2) consumes seismic wave energy by generating elastic deformation, and reduces energy directly acting on the retaining wall, so that the acting force and the soil moving pressure of the retaining wall are reduced, and the dynamic stability of the retaining wall is finally improved. Compared with the prior art, the retaining wall has the advantages of simple structure installation, convenience in operation and the like, and improves the dynamic stability of the retaining wall on the premise of ensuring good drainage conditions behind the retaining wall.

Description

Assembled retaining wall shock attenuation power consumption structure

Technical Field

The invention belongs to the technical field of seismic resistance of side slope retaining structures, and particularly relates to a shock-absorbing energy-absorbing structure of a retaining wall.

Background

The supporting and retaining structure is an important means for ensuring the stability of mountain slope and engineering construction and operation safety. In a plurality of supporting and retaining structure forms, the retaining wall is a slope treatment means widely applied in mountain areas in China due to convenient material acquisition and simple construction. Retaining walls are generally built with grouted rubbles, and sometimes with concrete, and their stability is mainly maintained by the weight of the wall.

China is located between two major earthquake zones in the world and earthquakes occur frequently. In recent years, a great number of major earthquakes cause great damage to supporting and retaining structures in earthquake regions. Wherein, the retaining wall can generate the destruction phenomena of slippage, overturning and the like under the action of earthquake. The existing research shows that under the action of earthquake, the soil body behind the wall and the wall body generate relative displacement, thereby generating soil movement pressure. Traditional retaining wall rigidity is big, and is too strong to the soil mass restriction behind the wall, causes the wall thickness soil pressure too big. In addition, the filling behind the wall and the wall body have an amplification effect on the earthquake motion, and the amplification effect increases nonlinearly as the wall body is higher. Thus, the stability of the retaining wall is reduced under the action of an earthquake, resulting in the destruction of the retaining wall. In order to ensure the stability of the structure under the action of earthquake, it is a common method to install a shock-absorbing and energy-absorbing structure at the key part of the structure. However, this measure is used more in upper buildings and underground structures and less in retaining structures such as retaining walls. Therefore, a damping and energy-consuming structure needs to be designed according to the structural characteristics of the retaining wall so as to ensure the stability of the retaining wall under the action of an earthquake.

Disclosure of Invention

The invention aims to provide an assembled shock absorption and energy absorption mechanism suitable for a retaining wall structure, and aims to solve the problems in the background art.

The utility model provides an assembled retaining wall shock attenuation energy-absorbing structure, characterized by, including assembly fixed plate (1), shock attenuation energy-absorbing unit (2), pressurization fastener (3), compound geotechnological drainage network (4), wherein:

the assembly fixing plate (1) is of a plate-shaped structure made of engineering plastics and can be divided into a damping and energy-absorbing unit fixing area (5) and a composite geotechnical drainage network fixing area (6), and the damping and energy-absorbing unit fixing area (5) comprises a tenon (7) and a mortise (8);

the shock absorption and energy absorption unit (2) is made of a rubber block; the shock absorption and energy absorption unit (2) comprises a tenon (9) and a mortise (10).

In the aspect of pressure control, the damping and energy-absorbing unit (2) is pressurized by using the assembly fixing plate (1) and the pressurizing fastener (3), so that the internal stress of the damping and energy-absorbing unit (2) is the same as the active soil pressure;

in the vertical direction, tenons (7) and mortises (8) in the assembling fixing plate (1) and tenons (9) and tenons (10) formed by the damping and energy-absorbing units (2) are joggled to ensure that the retaining wall damping and energy-absorbing structure can be in close contact after being assembled, so that the assembled retaining wall damping and energy-absorbing structure is formed.

The composite geotechnical drainage network (4) is placed in the composite geotechnical drainage network fixing area (6) of each assembly fixing plate (1), so that the overall stability of the assembly structure is further improved while the drainage behind the retaining wall is ensured.

Furthermore, the damping and energy-absorbing unit (2) is pressurized by using the assembling fixing plate (1) and the pressurizing fastener (3), so that the internal stress of the damping and energy-absorbing unit (2) is the same as the active soil pressure of the damping and energy-absorbing unit, the composite geotechnical drainage net (4) is ensured not to generate excessive deformation under the action of the soil pressure behind the wall, and the working efficiency of the composite geotechnical drainage net is ensured.

Furthermore, the assembled retaining wall shock absorption structure is joggled in the vertical direction through a tenon (7) and a mortise (8) in the assembling fixing plate (1) and a tenon (9) and a mortise (10) formed by the shock absorption units (2) so as to ensure that the retaining wall shock absorption structure can be in close contact after being assembled.

Furthermore, in order to ensure the rear drainage of the wall, a composite geotechnical drainage net (4) is laid behind the retaining wall to serve as a reverse filter layer; in addition, the composite geotechnical drainage net (4) penetrates through each assembly fixing plate (1), and the overall stability of the assembly structure is further improved.

Furthermore, in order to obtain better shock absorption and energy absorption effects, shock absorption and energy absorption units (2) with different hardness can be selected along the height of the wall; the specific parameters can be obtained by numerical calculation according to the local seismic fortification intensity; through numerical calculation, dynamic characteristics such as dynamic displacement, dynamic soil pressure, acceleration amplification factor and the like of the earth retaining wall under the action of the earthquake are comprehensively considered, and the damping and energy-absorbing unit (2) with a good effect is selected.

The working principle of the assembled retaining wall damping and energy absorbing structure is as follows: when the retaining wall is in a static state, the shock absorption and energy absorption units (2) are subjected to prepressing treatment, so that the shock absorption and energy absorption structure of the assembled retaining wall cannot generate compression deformation, the net core of the composite geotechnical drainage net (4) cannot generate overvoltage, and the working efficiency of the composite geotechnical drainage net as a reverse filter layer is ensured; when the retaining wall is in an earthquake state, the shock absorption and energy absorption units (2) consume earthquake wave energy by generating elastic deformation, and reduce energy directly acting on the retaining wall, so that the acting force and the soil moving pressure of the retaining wall are reduced, and the dynamic stability of the retaining wall is finally improved.

Compared with the prior art, the invention has the following advantages:

1. in the prior art, energy-absorbing materials with uniform material properties are paved behind walls, so that the energy can be well absorbed, but the soil body behind the walls is unevenly deformed along the height of the walls under the action of an earthquake. The damping and energy-absorbing unit (2) adopts a modular design scheme, and the damping and energy-absorbing units (2) with different hardness can be arranged and adjusted along the height of a wall according to the design requirement so as to obtain better comprehensive damping effect;

2. the dynamic stability of the retaining wall is improved, and meanwhile, the good drainage condition of filling soil behind the wall is realized by installing the composite geonet, so that the stability of the retaining wall under the rainfall condition is ensured; on the other hand, the stability of the damping and energy-absorbing structure of the fabricated retaining wall is also ensured by the installation of the composite earthwork net

3. In the prior art, the composite geotechnical drainage net is directly laid behind the retaining wall. The composite geotechnical drainage network is gradually compressed under the action of soil pressure, so that the working efficiency of the composite geotechnical drainage network is reduced along with time. The post-wall damping and energy-absorbing unit (2) is subjected to prepressing treatment, so that the assembled retaining wall damping and energy-absorbing structure is prevented from generating compression deformation, the net core of the composite geotechnical drainage net (4) is prevented from generating overvoltage, and the long-term working efficiency of the composite geotechnical drainage net as a reverse filter layer is ensured;

4. the raw materials of the material are easy to obtain and the price is low;

5. the assembly type retaining wall damping and energy absorbing structure is simple to install and convenient to operate.

Drawings

The contents of the drawings and the reference numerals in the drawings are briefly described below

FIG. 1 is a schematic diagram of the basic construction of the embodiment;

FIG. 2 is a functional partition of an assembled fixed plate of the embodiment;

FIG. 3 is a schematic structural view of a shock absorption and energy absorption unit according to an embodiment

FIG. 4 is a schematic view of the assembly and installation of the structure of the embodiment;

FIG. 5 is a schematic view showing the assembly effect of the structure of the embodiment;

in the figure:

1, assembling a fixing plate, 2 a damping and energy absorbing unit and 4 a composite geotechnical drainage network;

3, pressing a fastener;

5, damping and energy absorbing units and 6 composite geotechnical drainage net fixing areas;

7 tenon, 8 mortise, 9 tenon and 10 mortise;

11 retaining wall

Detailed Description

The technical scheme of the invention is explained in detail below by combining with specific examples, and parts not described need to be designed by combining with actual situations, and those skilled in the art can construct the invention by experiments and calculations according to the existing conditions under the guidance of the invention, without affecting the implementation of the invention.

As shown in fig. 1, the basic unit of the fabricated retaining wall shock-absorbing and energy-absorbing structure is composed of a fabricated fixing plate (1), a shock-absorbing and energy-absorbing unit (2), a pressurizing fastener (3) and a composite geotechnical drainage net (4).

By way of example, the assembly fixture plate (1) is made of ABS engineering plastic and is configured as shown in fig. 2. The assembly fixing plate (1) can be divided into a damping and energy-absorbing unit fixing area (5) and a composite geotechnical drainage network fixing area (6); wherein the fixed area (5) of the shock absorption and energy absorption unit comprises a tenon (7) and a mortise (8); the assembling fixing plate (1) is used for pressurizing and fixing the damping and energy-absorbing unit (2) and positioning the composite geotechnical drainage net (4); the two assembly fixing plates (1) apply pressure through the pressurizing fasteners (3) to fix the damping and energy-absorbing unit (2) and the composite geotechnical drainage net (4).

The shock absorption and energy absorption unit (2) is made of a rubber block; the damping and energy-absorbing unit (2) is mainly used for absorbing seismic energy and reducing the pressure of the moving soil behind the retaining wall; the shock absorption and energy absorption unit (2) comprises a tenon (9) and a mortise (10).

Examples

As shown in fig. 5, the height of the retaining wall (11) is 6m, the height of the selected damping and energy-absorbing unit (2) with the hardness of 30 is 0.5m, the width of the selected damping and energy-absorbing unit is 0.6m, and the width of the composite geotechnical drainage network (4) is 1.5 m; and calculating the soil pressure distribution of the retaining wall according to a Rankine soil pressure calculation formula. Sequentially calculating the pre-pressure required by each layer from the soil pressure distribution along the bottom of the wall to the top of the wall; after the pre-pressure is obtained, calculating the thickness of the damping and energy-absorbing unit (2) according to the Hooke's law; the assembly method of the invention is shown in figure 4:

step I: placing the damping and energy-absorbing unit (2) into a damping and energy-absorbing unit (5) of the assembly fixing plate (1), and prepressing the damping and energy-absorbing unit (2) through a pressurizing fastener (3) to enable the thickness of the damping and energy-absorbing unit to be the same as that of the composite geotechnical drainage network (4);

step II: after the step I is completed, the tenon (7) and the mortise (8) of the fixing plate (1) and the tenon (9) and the mortise (10) of the damping and energy-absorbing unit (2) are assembled for joggling along the height direction of the wall. Then the composite geotechnical drainage net (4) is placed in the composite geotechnical drainage net fixing area (6)

Step III: after step II is completed, the next group of units (2) to be damped and energy-absorbed is placed, and prepressing is carried out through the pressurizing fasteners (3).

And (5) sequentially repeating the step (II) and the step (III) to finish the installation of the shock absorption and energy absorption structure in one area, wherein the assembly effect of the structure is shown in figure 5.

Claims

1. The utility model provides an assembled retaining wall shock attenuation energy-absorbing structure, characterized by, including assembly fixed plate (1), shock attenuation energy-absorbing unit (2), pressurization fastener (3), compound geotechnological drainage network (4), wherein:

the shock absorption and energy absorption unit (2) is made of a rubber block; the damping and energy absorbing unit (2) comprises a tenon (9) and a mortise (10);

in the vertical direction, tenons (7) and mortises (8) in the assembled fixing plate (1) and tenons (9) and tenons (10) formed by the damping and energy-absorbing units (2) are joggled to ensure that the damping and energy-absorbing structure of the retaining wall can be in close contact after being assembled so as to form the assembled damping and energy-absorbing structure of the retaining wall;