CN111088740A - Shock-absorbing soil retaining plate and design method - Google Patents
Shock-absorbing soil retaining plate and design method Download PDFInfo
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- CN111088740A CN111088740A CN201911389672.5A CN201911389672A CN111088740A CN 111088740 A CN111088740 A CN 111088740A CN 201911389672 A CN201911389672 A CN 201911389672A CN 111088740 A CN111088740 A CN 111088740A
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- roadbed
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
Abstract
A shock-absorbing earth-retaining plate and a design method thereof are provided, which can effectively buffer the influence of earthquake action on roadbed engineering, thereby ensuring the integral stability of the roadbed engineering under the earthquake action, and the construction method is simple and convenient, thereby being beneficial to saving construction cost and operation and maintenance work. The shock absorption retaining plate is arranged between a wall back of a roadbed retaining wall structure and a roadbed and comprises a pair of front plates and rear plates which are vertical and parallel, wherein the upper ends and the lower ends of the front plates are provided with packaging structures which form cavities between the front plates and the rear plates, and the cavities between the front plates and the rear plates are densely filled with viscous buffer materials to form viscous buffer layers. The front plate surface is longitudinally and transversely provided with guide rods extending backwards horizontally at intervals, and each guide rod correspondingly penetrates through a guide hole in the rear plate surface.
Description
Technical Field
The invention relates to roadbed engineering, in particular to a roadbed structure with a high earthquake intensity area and a design method thereof.
Background
The earthquake-proof design of the roadbed is one of the construction difficulties of the Sichuan-Tibet railway, and if the earthquake-proof problem cannot be effectively solved in roadbed engineering, the roadbed is inevitably damaged, and the driving safety is influenced.
The Chuzang railway has the obvious characteristics that the railway line passes through a high earthquake intensity area, the earthquake action is strong, and in order to ensure the driving safety, a damping structure needs to be designed to protect the safety of roadbed engineering under the action of strong earthquake.
Disclosure of Invention
The invention aims to solve the technical problem of providing a shock-absorbing retaining plate to effectively buffer the influence of earthquake action on roadbed engineering, thereby ensuring the integral stability of the roadbed engineering under the earthquake action, and the construction method is simple and convenient, and is beneficial to saving construction cost and operation and maintenance work.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention discloses a shock absorption retaining plate, which comprises a roadbed retaining wall structure arranged on the outer side of a roadbed, and is characterized in that: the shock absorption retaining plate is arranged between a wall back of a roadbed retaining wall structure and a roadbed and comprises a pair of vertical and parallel front plates and rear plates, wherein the upper end and the lower end of each front plate are provided with an encapsulation structure which forms a cavity between the front plates and the rear plates, and viscous buffer materials are densely filled in the cavity between the front plates and the rear plates to form a viscous buffer layer; the front plate surface is longitudinally and transversely provided with guide rods extending backwards horizontally at intervals, and each guide rod correspondingly penetrates through a guide hole in the rear plate surface.
The height of shock attenuation retaining wall board equals with the height at road bed retaining wall structure wall back, and its front bezel, back plate are concrete prefabricated component, and the guide bar is pre-buried fixed on the front bezel plate body.
Another technical problem to be solved by the present invention is to provide a method for designing an anti-seismic soil retaining plate, which comprises the following steps:
① preparing viscous buffer material from asphalt, crushed stone and artificial fiber, prefabricating a viscous buffer layer, and measuring the mass M of the viscous buffer material;
②, carrying out an indoor yield stress experiment on the viscous buffer material, and measuring the rigidity coefficient K, the damping coefficient C and the allowable bearing capacity [ sigma ];
③ partitioning the area according to the geological data and seismic intensity of roadbed by calculating the active earth pressure E of earthquakeae:
In the formula: kvIs the horizontal earthquake influence coefficient, gamma is the volume weight of the roadbed, H is the height of the shock absorption retaining plate, KaeIs the earthquake initiative soil pressure coefficient;
④ the stress σ uniformly acting on the viscous buffer layer over a single width area is calculated using the following equation:
in the formula: w is the width of the viscous buffer layer;
⑤, the bearing capacity of the viscous buffer layer under the condition of multiple earthquakes is checked, and the following requirements are satisfied:
σ'≤[σ]
wherein σ' is the stress value of the yielding material commonly used in earthquake action, and [ σ ] is the ultimate bearing stress value of the viscous buffer layer, if not, the steps ① to ⑤ are repeated until the requirement of the above formula is satisfied.
And ⑤, performing deformation checking calculation on the viscous buffer layer under rare earthquake conditions, selecting an earthquake waveform meeting the characteristics of a local site by adopting a power analysis method, adjusting and controlling the peak acceleration of earthquake waves through maximum earthquake soil pressure, calculating the final deformation epsilon of the viscous buffer layer through a finite element, comparing the final deformation epsilon of the roadbed with a roadbed deformation control standard specified by an industry standard, if the final deformation epsilon of the roadbed is smaller than the deformation control standard, considering that the height b of the viscous buffer layer meets the field requirement, and if the final deformation epsilon of the roadbed is larger than the deformation control standard, until the deformation calculation result meets the control standard requirement.
The invention has the advantages that the shock absorption retaining plate is arranged between the wall back of the roadbed retaining wall structure and the roadbed, so that the influence of the earthquake action on roadbed engineering can be effectively buffered, and the deformation of the roadbed under the earthquake action is reduced, thereby ensuring the integral stability of the roadbed engineering under the earthquake action and effectively ensuring the driving safety; the upper end and the lower end of the front plate of the damping soil retaining plate are provided with packaging structures, so that viscous buffer materials can be restrained in cavities between the plates, and the viscous buffer layers can continuously play a role; the guide rod arranged on the front plate surface provides a horizontal guide effect for the rear plate, and the rear plate moves forwards relative to the front plate surface under the action of seismic waves to act on the viscous buffer layer, so that the energy absorption and buffering effects of the viscous buffer layer can be fully exerted; the damping soil retaining plate has the advantages of simple structure, definite stress, simple and convenient design and construction method, and is favorable for saving the construction cost and the operation and maintenance work.
Drawings
The specification includes the following 7 drawings:
FIG. 1 is a sectional view of a shock-absorbing soil retaining plate of the present invention in accordance with embodiment 1;
FIG. 2 is a cross-sectional pictorial illustration of a shock absorbing retaining plate of the present invention;
FIG. 3 is a cross-sectional view taken along line D-D of FIG. 2;
FIG. 4 is an enlarged view of portion E of FIG. 2;
FIG. 5 is a cross-sectional view of a shock-absorbing soil retaining plate structure of embodiment 2 of the present invention;
FIG. 6 is a sectional view of a shock-absorbing soil retaining plate structure of embodiment 3 of the present invention;
FIG. 7 is a sectional view of a shock-absorbing soil guard structure of embodiment 4 of the present invention;
the component names and corresponding labels are shown in the figure: the concrete foundation comprises a rigid foundation 10, a pile foundation 11, an anti-slide pile 12, an assembled retaining wall 20, a gravity retaining wall 21, a viscous buffer material 30, a front plate 31, a rear plate 32, a packaging structure 34, a guide rod 35, a pre-stressed anchor rod 41, an anchor plate 42, a roadbed A, a shock absorption retaining plate height H, a shock absorption retaining plate width W, a shock absorption retaining plate thickness B, an in-plate cavity height H and an in-plate cavity thickness B.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Referring to fig. 1 to 4, the shock absorption retaining plate of the present invention includes a roadbed retaining wall structure arranged outside a roadbed a, the shock absorption retaining wall structure is arranged between the wall back of the roadbed retaining wall structure and the roadbed a, and includes a pair of vertical and parallel front plates 31 and rear plates 32, the upper end and the lower end of the front plates 31 are provided with packaging structures 34 forming cavities between the front plates 31 and the rear plates 32, and the cavities between the plates are densely filled with viscous buffer materials to form viscous buffer layers 30; the front plate 31 is provided with guide rods 35 extending horizontally and backwards at intervals in the longitudinal direction and the transverse direction, and each guide rod 35 correspondingly penetrates through a guide hole in the rear plate 32. This shock attenuation keeps off native board can effectively cushion the earthquake effect to road bed A's influence, reduces the deformation of road bed under the earthquake effect to guarantee road bed A overall stability under the earthquake effect, effectively ensure driving safety nature. The viscous buffer material is confined in the cavity between the plates by the packaging structures 34 at the upper and lower ends of the front plate 31 of the shock-absorbing retaining plate, so that the viscous buffer layer 30 can continuously play a role. The guide rod 35 arranged on the surface of the front plate 31 provides a horizontal guide effect for the rear plate 32, and the rear plate 32 moves forwards relative to the surface of the front plate 31 under the action of seismic waves to be used on the whole viscous buffer layer 30, so that the energy absorption and buffering effects of the viscous buffer layer 30 can be fully exerted.
Referring to fig. 1 to 4, the height H of the shock-absorbing retaining plate is equal to the height of the back of the retaining wall structure. In a preferred embodiment, the front plate 31 and the rear plate 32 are made of concrete prefabricated parts, and the package structure 34 is a flange integrally formed with the front plate 31. The guide rod 35 is embedded and fixed on the front plate 31 plate body.
The invention has good adaptability and can be used for various roadbed structures.
Referring to embodiment 1 shown in fig. 1, the roadbed retaining wall structure is composed of a rigid foundation 10 and a fabricated retaining wall 20 seated thereon.
Referring to embodiment 2 shown in fig. 5, the roadbed retaining wall structure includes a rigid foundation 10 and a fabricated retaining wall 20 located thereon, pile foundations 11 penetrating into a stabilized rock-soil layer are provided at intervals below the rigid foundation 10, and the upper ends of the pile foundations 11 are consolidated with the rigid foundation 10 into a whole. The roadbed A is internally provided with prestressed anchor rods 41 penetrating through the damping retaining plates at intervals along the longitudinal direction and the line extending direction, the front ends of the prestressed anchor rods 41 are anchored and connected with the fabricated retaining wall 20, and the rear ends of the prestressed anchor rods are fixedly connected with anchor plates 42 buried in the roadbed A.
Referring to embodiment 3 shown in fig. 6, the retaining wall structure of roadbed is composed of anti-slide piles 12 and retaining plates, the anti-slide piles 12 are arranged at intervals along the direction of the road, the lower part of each anti-slide pile 12 penetrates into the stabilized rock-soil layer, and the retaining plates are arranged between the exposed cantilever sections of the adjacent anti-slide piles 12.
Referring to embodiment 4 shown by fig. 7, the roadbed retaining wall structure is a gravity retaining wall 21.
The invention relates to a design method of a shock absorption retaining plate, which comprises the following steps:
① preparing viscous buffer material from asphalt, crushed stone and artificial fiber, prefabricating a viscous buffer layer, and measuring the mass M of the viscous buffer material;
②, carrying out an indoor yield stress experiment on the viscous buffer material, and measuring the rigidity coefficient K, the damping coefficient C and the allowable bearing capacity [ sigma ];
③ partitioning the area according to the geological data and seismic intensity of roadbed by calculating the active earth pressure E of earthquakeae:
In the formula: kvIs the horizontal earthquake influence coefficient, gamma is the volume weight of the roadbed, H is the height of the shock absorption retaining plate, KaeIs the earthquake initiative soil pressure coefficient;
④ the stress σ uniformly acting on the viscous buffer layer 30 over a single width area is calculated using the following equation:
in the formula: w is the width of the viscous buffer layer 30;
⑤, the viscous buffer layer 30 is subjected to the bearing capacity checking calculation under the condition of multiple earthquakes, and the following requirements are satisfied:
σ'≤[σ]
wherein σ' is the stress value of the yielding material commonly used in seismic action, and [ σ ] is the ultimate bearing stress value of the viscous buffer material layer 30, if not, steps ① to ⑤ are repeated until the requirement of the above formula is satisfied.
And ⑤, performing deformation checking calculation on the viscous buffer layer 30 under rare earthquake conditions, adopting a dynamic analysis method, selecting an earthquake waveform which accords with the characteristics of a local site, adjusting and controlling the peak acceleration of earthquake waves through maximum earthquake soil pressure, calculating the final deformation epsilon of the viscous buffer layer 30 through a finite element, comparing the final deformation epsilon of the roadbed with a roadbed deformation control standard specified by an industry specification, if the final deformation epsilon of the roadbed is smaller than the deformation control standard, considering that the height b of the viscous buffer layer 30 accords with the field requirement, and if the final deformation epsilon of the roadbed is larger than the deformation control standard, until the deformation calculation result meets the control standard requirement.
Example (b):
the invention discloses a design method of an anti-seismic retaining plate structure, which comprises the following steps:
① collecting field design data, the road base unit weight gamma of the road section in the area is 18kN/m3The earthquake fortification intensity is 9 degrees, the designed basic earthquake acceleration value is 0.4g, the included angle between the wall surface of the retaining wall and a lead straight line is α -0 degrees, and the internal friction angle of the filling soil behind the wall
Considering that the included angle η between the synthetic acceleration and a lead line is 10 degrees, the included angle β between the filled soil and the horizontal plane is 0 degree, and the internal friction angle delta between the filled soil and the wall back is 15 degrees when the earthquake acts;
② preparing viscous buffer material, prefabricating the viscous buffer layer 30, measuring mass M, the thickness B of the damping soil guard plate is 0.2m, the height H is 10m, and the width W is 1m, preparing the viscous buffer material by asphalt, gravel and artificial fiber according to the components;
③, carrying out an indoor buffer material yield stress experiment, and measuring the rigidity coefficient K, the damping coefficient C and the allowable bearing capacity [ sigma ] of the buffer viscous material;
④ partitioning the area A according to the geological data and seismic intensity, calculating the earthquake active earth pressure Eae:
⑤ calculates the stress σ uniformly acting on the viscous buffer layer 30 over a single wide area using the following equation;
⑥, carrying out checking calculation on the bearing capacity of the buffer material under the condition of multi-earthquake, wherein sigma is 72.9kPa (not more than sigma) and 80kPa (not more than sigma), and the requirement is met;
⑦, carrying out deformation checking calculation on the buffer material under the condition of rare earthquakes, wherein a dynamic analysis method is adopted in the process, three groups of earthquake waveforms which accord with local site characteristics are selected, namely Wenchuan waves, Dumai waves and a artificially synthesized waveform, the peak acceleration of the earthquake waves is adjusted and controlled through the maximum earthquake soil pressure, and the final deformation epsilon of the buffer material is calculated to be 0.03m through finite element calculation software;
⑧, comparing the final deformation of the roadbed with the roadbed deformation control standard specified by the industry standard, wherein the maximum deformation of the roadbed should be less than 0.1m in order to ensure the driving safety in the area, and the final deformation of the material meets the requirement.
The foregoing merely illustrates the principles of the invention in a shock absorbing retaining plate and method of design and is not intended to limit the invention to the exact construction and operation shown and described, and accordingly all modifications and equivalents may be resorted to, falling within the scope of the invention.
Claims (9)
1. The utility model provides a shock attenuation retaining wall board, is including setting up in the road bed retaining wall structure in the road bed (A) outside, characterized by: the shock absorption retaining plate is arranged between a wall back of a roadbed retaining wall structure and a roadbed (A) and comprises a pair of vertical and parallel front plates (31) and rear plates (32), the upper end and the lower end of each front plate (31) are provided with packaging structures (34) which form an inter-plate cavity between the front plates (31) and the rear plates (32), and the inter-plate cavity is densely filled with viscous buffer materials to form a viscous buffer layer (30); the guide rods (35) extending horizontally and backwards are longitudinally and transversely arranged on the surface of the front plate (31) at intervals, and each guide rod (35) correspondingly penetrates through a guide hole on the surface of the rear plate (32).
2. A shock-absorbing soil retaining plate as claimed in claim 1 wherein: height (H) of shock attenuation retaining wall board equals with the height of roadbed retaining wall structure wall back, and its front bezel (31), back plate (32) are concrete prefabricated component, and guide bar (35) are pre-buried fixed on front bezel (31) plate body.
3. A shock-absorbing soil retaining plate as claimed in claim 2 wherein: the roadbed retaining wall structure is composed of a rigid foundation (10) and an assembled retaining wall (20) located on the rigid foundation.
4. A shock-absorbing soil retaining plate as claimed in claim 2 wherein: roadbed retaining wall structure includes rigid foundation (10) and the assembled retaining wall (20) of sitting on it, and rigid foundation (10) below interval sets up pile foundation (11) that penetrate stable ground layer, and pile foundation (11) upper end concreties as an organic wholely with rigid foundation (10).
5. A shock absorbing earth retaining plate as claimed in claim 4, wherein: the roadbed (A) is internally provided with prestressed anchor rods (41) penetrating through the damping retaining plates at intervals along the longitudinal direction and the line extending direction, the front ends of the prestressed anchor rods (41) are anchored and connected with the fabricated retaining wall (20), and the rear ends of the prestressed anchor rods are fixedly connected with anchor plates (42) buried in the roadbed (A).
6. A shock-absorbing soil retaining plate as claimed in claim 2 wherein: the roadbed retaining wall structure is composed of anti-slide piles (12) and retaining plates, the anti-slide piles (12) are arranged at intervals along the line direction, the lower parts of the anti-slide piles (12) penetrate into the stabilized rock-soil layer, and the retaining plates are arranged between exposed cantilever sections of the adjacent anti-slide piles (12) at the back of the piles.
7. A shock-absorbing soil retaining plate as claimed in claim 2 wherein: the roadbed retaining wall structure is a gravity type retaining wall (21).
8. A design method of a shock-absorbing soil retaining plate according to any one of claims 1 to 7, comprising the steps of:
① preparing viscous buffer material from asphalt, crushed stone and artificial fiber, prefabricating a viscous buffer layer, and measuring the mass M of the viscous buffer material;
②, carrying out an indoor yield stress experiment on the viscous buffer material, and measuring the rigidity coefficient K, the damping coefficient C and the allowable bearing capacity [ sigma ];
③ partitioning the area according to the geological data and seismic intensity of roadbed by calculating the active earth pressure E of earthquakeae:
In the formula: kvIs the horizontal earthquake influence coefficient, gamma is the volume weight of the roadbed, H is the height of the shock absorption retaining plate, KaeIs the earthquake initiative soil pressure coefficient;
④ the stress σ uniformly acting on the viscous buffer layer (30) over a single width area is calculated using the following equation:
in the formula: w is the width of the viscous buffer material layer (30);
⑤, the viscous buffer layer (30) is tested under the condition of multiple earthquakes, and the following requirements are satisfied:
σ'≤[σ]
wherein, sigma' is the stress value of the yielding material commonly used for earthquake action, and [ sigma ] is the ultimate bearing stress value of the viscous buffer material layer (30), if not, the steps ① to ⑤ are carried out again until the requirement of the above formula is met.
9. The design method of a shock absorption soil retaining plate structure according to claim 1, wherein the viscous buffer layer (30) is subjected to deformation checking calculation under rare earthquake conditions after the step ⑤, a dynamic analysis method is adopted, seismic waveforms meeting local site characteristics are selected, the maximum seismic earth pressure is adjusted and controlled to control the seismic peak acceleration, the final deformation epsilon of the viscous buffer layer (30) is calculated through finite elements, the final deformation epsilon of the roadbed is compared with a roadbed deformation control standard specified by an industry specification, if the final deformation epsilon of the roadbed is smaller than the deformation control standard, the height b of the viscous buffer layer (30) is considered to meet the field requirement, and if the final deformation epsilon of the roadbed is larger than the deformation control standard, the deformation calculation result meets the control standard requirement.
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2019
- 2019-12-29 CN CN201911389672.5A patent/CN111088740A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| JP2001262601A (en) * | 2000-03-17 | 2001-09-26 | Ohbayashi Corp | Construction of vibration isolation of structure and base isolating method and earth retaining material |
| CN204000522U (en) * | 2014-07-10 | 2014-12-10 | 浙江金筑交通建设有限公司 | A kind of novel roadbed retaining structure |
| CN206681032U (en) * | 2016-10-31 | 2017-11-28 | 中铁二院工程集团有限责任公司 | A kind of retaining wall antidetonation buffer structure |
| CN106522270A (en) * | 2016-12-28 | 2017-03-22 | 华中科技大学 | Pile foundation and retaining wall anti-earthquake retaining structure comprising EPS buffer layers and construction method |
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Non-Patent Citations (1)
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