CN115162085A

CN115162085A - Roadbed structure based on interlocking synergistic effect of slope footwall and mattress layer

Info

Publication number: CN115162085A
Application number: CN202210965712.1A
Authority: CN
Inventors: 岳建朋; 王亮亮; 刘梅; 杨默涵; 王乔治; 赵雷雷; 赵大勇
Original assignee: China Railway Shanghai Design Institute Group Co Ltd
Current assignee: China Railway Shanghai Design Institute Group Co Ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-10-11

Abstract

The invention discloses a roadbed structure based on interlocking synergistic effect of slope foot walls and mattress layers, which comprises two slope foot walls fixed on a foundation, wherein the slope foot walls are positioned on two transverse sides of the roadbed and are arranged along the direction of the roadbed, a multilayer mattress layer is arranged between the two slope foot walls and is fixedly connected with the slope foot walls, the multilayer mattress layer comprises a mattress layer I at the upper part and a mattress layer II tightly attached to the lower part of the mattress layer, the upper surface of the mattress layer I is sequentially covered with a foundation bed bottom layer and a foundation bed surface layer, the mattress layer is matched with the slope foot walls and is used for resisting vertical and transverse tensile force generated by deformation of the foundation, geogrid in the mattress layer is poured into the slope foot walls for fixed connection, the mattress layer and the slope foot walls can be deformed in a synergistic manner through actual operation optimization of an anchoring connection manner, and meanwhile, and the integrity of the slope foot walls is enhanced through arrangement of vertical reinforcing ribs and transverse structural reinforcing steel bars. The slope foot wall is used for balancing the tensile force generated when the geogrid deforms.

Description

Roadbed structure based on interlocking synergistic effect of slope footwall and mattress layer

Technical Field

The invention relates to the technical field of roadbed engineering, in particular to a roadbed structure based on interlocking synergistic effect of a slope footwall and a mattress layer.

Background

In a highway (railway) roadbed, a concrete slope footwall is usually arranged at a slope toe to restrain the lateral deformation of the roadbed under the combined action of self weight and vehicle load, and a reinforced broken stone mattress layer is arranged on a base to adjust the problem of differential settlement of a roadbed surface caused by uneven deformation of the roadbed. The slope footwall and the reinforced mattress layer have different functions and respectively and independently play roles, and the treatment measure can ensure the overall stability of the roadbed when the foundation soil engineering characteristics are stable and the bearing capacity is strong. However, in a weak foundation section where the rainfall and drought seasonal fluctuation of the underground water level is large and the degradation of the engineering characteristics of the foundation soil is obvious along with the change of humidity, the problems of softening and sedimentation of the foundation soil caused by the rise of the underground water level and the degradation of the engineering characteristics of the soil engineering caused by the repeated rise and fall of underground water along with the dry-wet cycle action exist, and the problems of overlarge overall subsidence of a mattress layer, the slippage of the base of a slope foot wall and the like are easily caused.

To this type of problem, an urgent need is a novel soft foundation section roadbed structure, makes roadbed slope foot wall and mattress layer can interlock each other and warp in coordination, ensures soft foundation section roadbed stability, reduces the inhomogeneous deformation of road bed, reduces the road bed disease.

In the prior art, CN214938887U relates to a roadbed widening structure under a steep terrain condition, which comprises an old road and an empty steep wall positioned at the valley side of the old road, wherein the steep wall is excavated inwards to form a wall and then an excavation side wall and a step-shaped artificial steep wall are excavated; the step-shaped artificial steep wall is provided with anchoring steel bars and a plurality of anchor rods with different heights, the anchoring steel bars and the anchor rods are anchored into a mountain along the step-shaped artificial steep wall, and the design aims at splicing old roads and cannot provide a substantial anti-change roadbed structure.

Disclosure of Invention

The invention aims to provide a roadbed structure based on interlocking synergistic effect of a slope footwall and a mattress layer, which is simple in construction method and firm in structure, so as to solve the defects caused in the prior art.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme: the utility model provides a roadbed structure based on slope foot wall and mattress layer interlocking synergism, includes two slope foot walls that are fixed in on the ground, slope foot wall position and the horizontal both sides of road bed and set up along the roadbed trend, be equipped with multilayer mattress layer between two slope foot walls, mattress layer with slope foot wall fixed connection, multilayer mattress layer includes mattress layer I on upper portion and mattress layer II rather than the inseparable laminating of lower part, I upper surface of mattress layer covers in proper order has bed bottom, bed top layer, mattress layer cooperation slope foot wall is used for resisting the vertical, horizontal pulling force that the ground warp the production.

The mattress layer I comprises: the gravel cushion layer III, the gravel cushion layer IV and the geogrid II are arranged between the gravel cushion layer III and the gravel cushion layer IV; the mattress layer II comprises: rubble bed course I, rubble bed course II and geogrid I, geogrid I is arranged in between rubble bed course I, rubble bed course II, the inseparable laminating of rubble bed course III.

The geogrid I and the geogrid II are same in grid size, and the inner diameter of each grid is larger than or equal to 2 times of the largest particle diameter of aggregate in concrete adopted for pouring of the slope toe wall.

And the two ends of the geogrid I and the two ends of the geogrid II extend and are fixed in the corresponding toe walls.

Geogrid I equals with the length that geogrid II is fixed in the toe wall, all satisfies its resistance to plucking requirement, and the upper and lower mesh of geogrid I and geogrid II coincides completely on the plane of projection.

Many vertical strengthening ribs, many horizontal structure muscle have been buried underground in the toe wall, many vertical strengthening ribs, many horizontal structure muscle equidistance are arranged and are formed the reinforcing bar net piece, and the axis of vertical strengthening rib should be located the central line of toe wall, the reinforcing bar net piece sets up with I, II perpendicular of geogrids, just vertical strengthening rib passes I and II meshes of geogrid and with I, II fixed connection of geogrid, horizontal structure muscle equidistance is fixed in on the vertical strengthening rib of II belows of geogrid.

The distance between any two vertical reinforcing ribs is integral multiple of the center distance between adjacent meshes in the geogrid I and the geogrid II.

According to the technical scheme, the invention at least has the following beneficial effects:

1. the roadbed structure designed by the invention adopts the mode that the geogrid in the mattress layer is poured into the slope footwall for fixed connection, and the anchoring connection mode is optimized in actual operation, so that the mattress layer and the slope footwall can cooperatively deform, and meanwhile, the integrity of the slope footwall is enhanced by the arrangement of the vertical reinforcing ribs and the transverse construction reinforcing steel bars. The slope toe wall is used for balancing the tensile force generated when the geogrid deforms, and meanwhile, the slope toe wall is also subjected to the tensile force of the geogrid, so that the lateral deformation of the roadbed is limited, and the vertical uneven deformation is coordinated. The stability of road bed can be showing to the interlocking synergism of slope foot wall and mattress layer.

2. According to the invention, the steel bar net piece formed by binding and fixing the vertical reinforcing ribs and the transverse construction steel bars is perpendicular to the geogrid I and the geogrid II, and the structure can be installed to furthest resist the transverse tension caused by foundation deformation, so that the stability of the foundation structure is furthest ensured after the foundation is installed, and the stability of the roadbed structure is improved.

Drawings

FIG. 1 is a schematic view of the overall arrangement of the foundation bed structure of the present invention;

FIG. 2 is a schematic view showing the structure of a mattress layer I (II) according to the present invention;

FIG. 3 is a schematic front view of the inner structure of the toe wall according to the present invention;

FIG. 4 is a schematic top view of the interior structure of the toe wall of the present invention;

FIG. 5 is a schematic side view of the interior structure of the toe wall of the present invention;

FIG. 6 is a schematic view of the interior of the toe wall of the present invention;

wherein: 1-foundation; 2-geogrid I; 3-geogrid II; 4-a gravel cushion layer; 41-gravel cushion layer I; 42-gravel cushion layer II; 43-crushed stone cushion III; 44-gravel cushion IV; 5-vertical reinforcing ribs; 6-transverse construction of ribs; 7-toe wall; 8-the bed bottom layer; 9-bedding surface layer.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

As shown in fig. 1 to 6, the invention provides a roadbed structure based on interlocking and synergistic effects of slope foot walls and mattress layers, which comprises slope foot walls 7, vertical reinforcing ribs 5, transverse construction reinforcing steel bars 6, geogrids I2, geogrids II 3, a gravel cushion layer 4, a foundation bed layer 8 and a foundation bed surface layer 9. The broken stone cushion layer 4 comprises four layers of broken stones, and the slope footwall 7 is formed by pouring concrete, is positioned at two transverse sides of the roadbed and is arranged along the direction of the roadbed; the geogrid I2, the broken stone cushion layer I41 and the broken stone cushion layer II 42 jointly form a mattress cushion layer I, the geogrid II 3, the broken stone cushion layer III 43 and the broken stone cushion layer IV 44 jointly form a mattress cushion layer II, and all the broken stone cushion layers are equal in thickness. And a mattress layer I, a mattress layer II, a foundation bed bottom layer 8 and a foundation bed surface layer 9 are arranged between the slope footwalls 7 on the two sides in sequence from the foundation 1 to the top. The geogrid I2 and the geogrid II 3 extend towards the slope toe walls 7 on the two sides and are poured into the slope toe walls 7; the vertical reinforcing ribs 5 and the transverse constructional reinforcing steel bars 6 are bound and connected to form a reinforcing steel bar net piece, and the vertical reinforcing ribs 5 penetrate through meshes of the geogrid I2 and the geogrid II 3 and are poured in the slope footwall 7.

Referring to fig. 6, the lengths of the geogrid i 3 and the geogrid ii 2 fixed in the slope toe wall 7 are equal, the uplift resistance requirements of the geogrid i 3 and the geogrid ii 2 are all satisfied, and the upper meshes and the lower meshes of the geogrid i 3 and the geogrid ii 2 are completely overlapped on the projection plane. Vertical strengthening rib 5, the 6 equidistance ligature of horizontal structure muscle become the reinforcing bar net piece, and the reinforcing bar net piece sets up with I3 of geogrid, II 2 are perpendicular, just vertical strengthening rib 5 pass the mesh in I3 of geogrid and II 2 of geogrid and with I3 of geogrid and II fixed connection of geogrid, horizontal structure muscle 6 equidistance is fixed in on the vertical strengthening rib 5 of II 2 below of geogrid.

Further, the distance between any two vertical reinforcing ribs 5 is an integral multiple of the center distance between adjacent meshes in the geogrid I3 and the geogrid II 2, and the distance between two adjacent vertical reinforcing ribs 5 is preferably about 10 cm.

The specific implementation operation is as follows: firstly, a layer of gravel cushion layer I41 is paved on a treated foundation 1, the gravel cushion layer I41 is rolled, after the designed compaction degree is reached, a geogrid I2 is paved on the gravel cushion layer I2, the mesh size of the geogrid I2 is more than or equal to 2 times of the maximum particle size of aggregate in concrete used for pouring the slope toe wall 7, the geogrid I extends towards the slope toe walls 7 on two sides, and the extending length meets the anti-pulling requirement. A row of vertical reinforcing ribs 5 with equal intervals are arranged in the slope foot wall 7, the central axis of each vertical reinforcing rib 5 is located on the central line of the slope foot wall 7, the distance between every two adjacent vertical reinforcing ribs 5 is about 10cm and is an integral multiple of the hole pitch of the geogrids, the length of each vertical reinforcing rib 5 is not smaller than the tensile influence range of the slope foot wall 7, and the vertical reinforcing ribs penetrate through meshes of the geogrids I and are bound on grid bars in the non-tensile direction. At geogrid I2 downwards along 5 directions of vertical strengthening rib, set up horizontal structure reinforcing bar 6 downwards, the row pitch of horizontal structure reinforcing bar 6 equals with vertical strengthening rib 5 to connect into reinforcing bar net piece through the ligature method perpendicularly with vertical strengthening rib 5. And paving a gravel cushion layer II 42 above the geogrid I2, paving a gravel cushion layer III 43 above the gravel cushion layer II 42, and then rolling to a designed compaction degree, wherein the compacted thickness is 2 times of the thickness of the gravel cushion layer I41 below the geogrid I2. Lay geogrid II 3 above rubble bed course III 43, its size should be the same with geogrid I2, extends geogrid II 3 to both sides banket wall 7 for the length of geogrid II 3 in the banket wall equals with geogrid I2, and the mesh coincidence of geogrid I2, and makes vertical strengthening rib 5 pass geogrid II 3, and the ligature of grid strip with the non-direction of pulling. And pouring a steel bar net piece consisting of the geogrid I2, the geogrid II 3, the vertical reinforcing ribs 5 and the transverse construction steel bars 6 into the slope toe wall 7 together. And then, paving a gravel cushion layer IV 44 above the geogrid II 3, rolling the gravel cushion layer IV to reach the designed compactness, and filling the gravel cushion layer IV with the same thickness as the gravel cushion layer I41 below the geogrid I2, and then sequentially filling a foundation bed bottom layer 8 and a foundation bed surface layer 9 above the gravel cushion layer.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or are equivalent to the scope of the invention are intended to be embraced therein.

Claims

1. The utility model provides a roadbed structure based on slope foot wall and mattress layer interlocking synergism, a serial communication port, including two slope foot walls (7) that are fixed in on ground (1), slope foot wall (7) are located the horizontal both sides of road bed and set up along the road bed trend, be equipped with multilayer mattress layer between two slope foot walls (7), mattress layer with slope foot wall (7) fixed connection, multilayer mattress layer includes mattress layer I on upper portion and the mattress layer II of closely laminating rather than the lower part, I upper surface of mattress layer covers in proper order has bedding bottom (8), bedding top layer (9), mattress layer cooperation slope foot wall (7) are used for resisting vertical, horizontal pulling force that ground (1) warp the production.

2. The roadbed structure based on the interlocking and synergistic effect of the slope foot wall and the mattress layer, as claimed in claim 1, wherein the mattress layer I comprises: the gravel cushion layer III (43), the gravel cushion layer IV (44) and the geogrid II (3), wherein the geogrid II (3) is arranged between the gravel cushion layer III (43) and the gravel cushion layer IV (44); the mattress layer II comprises: rubble bed course I (41), rubble bed course II (42) and geogrid I (2), arrange in between rubble bed course I (41), the rubble bed course II (42) geogrid I (2), rubble bed course II (42), the III (43) of rubble bed course of closely laminating.

3. The roadbed structure based on the interlocking and synergistic effect of the slope toe wall and the mattress layer, as claimed in claim 2, wherein the geogrid I (3) and the geogrid II (2) have the same mesh size, and the inner diameter of the mesh is more than or equal to 2 times of the maximum size of aggregate in concrete used for pouring the slope toe wall.

4. The roadbed structure based on the interlocking and synergistic effect of the slope foot wall and the mattress layer, as claimed in claim 3, wherein the two ends of the geogrid I (3) and the geogrid II (2) are fixed in the corresponding slope foot wall (7) in an extending way.

5. The roadbed structure based on the interlocking and synergistic effect of the slope footwall and the mattress layer according to the claim 4, wherein the lengths of the geogrid I (3) and the geogrid II (2) which are fixed in the slope footwall (7) are equal, the uplift resistance requirements of the geogrid I (3) and the geogrid II (2) are met, and the upper meshes and the lower meshes of the geogrid I (3) and the geogrid II (2) are completely overlapped on the projection plane.

6. The roadbed structure based on the interlocking and synergistic effect of the toe wall and the mattress layer according to claim 4, wherein a plurality of vertical reinforcing ribs (5) and a plurality of transverse construction ribs (6) are embedded in the toe wall, the vertical reinforcing ribs (5) and the transverse construction ribs (6) are arranged at equal intervals to form a reinforcing mesh, the central axis of each vertical reinforcing rib (5) is located on the central line of the toe wall (7), the reinforcing mesh is perpendicular to the geogrid I (3) and the geogrid II (2), the vertical reinforcing ribs (5) penetrate through meshes of the geogrid I (3) and the geogrid II (2) and are fixedly connected with the geogrid I (3) and the geogrid II, and the transverse construction ribs (6) are fixed on the vertical reinforcing ribs (5) below the geogrid II (2) at equal intervals.

7. The roadbed structure based on the interlocking and synergistic effect of the slope foot wall and the mattress layer according to the claim 6, wherein the distance between any two vertical reinforcing ribs (5) is integral multiple of the center-to-center distance between adjacent meshes in the geogrid I (3) and the geogrid II (2).