Shock insulation roadbed structure of road and shock insulation road

Abstract

The invention provides a road shock insulation roadbed structure and a shock insulation road, the road shock insulation roadbed structure comprises an embankment, and is characterized by comprising a high-damping concrete layer, a shock insulation cushion layer, a concrete bearing layer and a flexible buffer layer which are sequentially arranged below the embankment from top to bottom, and shock insulation pile holes arranged in a soil body below the flexible buffer layer in an array, the rubber hole protection sleeves are attached to the inner walls of the shock insulation pile holes and inserted into the shock insulation pile holes, and the shock insulation grooves are excavated in the direction of the road close to the two sides of the embankment. According to the invention, the transmission of earthquake energy to the embankment and the road surface can be reduced, so that the road can be protected.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering, and in particular relates to a road seismic isolation subgrade structure and a seismic isolation road. Background Art

[0002] my country is located between the two major seismic belts in the world (the Pacific Rim and the Himalayas-Mediterranean Seismic Belt), and many of its territories are located in these two seismic belts. Under its influence, my country's seismic activities are not only frequent and strong, but also wide-ranging, with strong earthquakes occurring almost all over the country. According to statistics, my country's earthquakes account for about one-third of the world's earthquakes; since the beginning of this century, my country accounts for about 35% of the world's strong earthquakes above magnitude 7. Therefore, my country attaches great importance to earthquake disaster prevention and mitigation measures.

[0003] Earthquakes cause serious damage to people's living buildings. Research on earthquake-resistant and seismic isolation measures for buildings has been continuously developing, and more and more earthquake-resistant and seismic isolation structures have been developed to enhance the strength and life of buildings. However, earthquake-resistant and seismic isolation for road traffic, the lifeline of residents, has not received much attention.

[0004] The roadbed structure mainly consists of fill embankments, as well as support and reinforcement protection structures to ensure the stability of the roadbed. Different roadbed structures will result in different degrees of damage after an earthquake. For fill embankments, when they are damaged by an earthquake, they need to be refilled, and they are likely to affect surrounding buildings / structures (such as bridges, etc.), which consumes huge manpower and material resources. In particular, many highways are now constructing high fill embankments, and high fill embankments ranging from more than ten meters to tens of meters are often encountered. In addition, during earthquakes, roads are damaged by earthquakes, resulting in poor traffic and even paralysis after the earthquake, which seriously affects the subsequent rescue work and misses the best time for rescue. Especially for near-earth earthquakes, it is easy to cause serious damage to a variety of road infrastructure. Therefore, in the case of extreme earthquakes, in order to effectively protect the road network, it is necessary to take seismic isolation measures to improve the seismic resistance of the embankment.

[0005] The isolation system is defined as a flexible or sliding interface between a structure and its foundation, so that the horizontal movement of the ground is less correlated with the horizontal movement of the structure, thereby reducing earthquake damage to the structure and its contents. The existing isolation types mainly include laminated rubber bearing isolation system, sliding friction isolation system, composite isolation system and suspension isolation system. They have demonstrated the superiority of isolation technology in the fields of construction and bridges. In recent years, rubber pad isolation system has been gradually developed because of its advantages such as simple material, convenient layout and strong functionality. It is very suitable for buildings with small upper loads. The rubber sand-soil mixed cushion can effectively reduce horizontal vibrations and vertical vibrations. The road distribution terrain is varied and the area is wide. The upper load of the embankment is lower than that of the house building. The foundation has strong transformability, so the elasticity and isolation performance of materials such as rubber can be fully utilized.

[0006] Therefore, it is very necessary and feasible to invent an isolation roadbed structure that can be effectively and economically applied to existing road isolation projects and protect the road by reducing the transmission of earthquake energy to the embankment and the road surface. Summary of the invention

[0007] In response to the problems mentioned in the background technology, the present invention provides a road seismic isolation subgrade structure and a seismic isolation road.

[0008] The present invention is achieved through the following technical solutions.

[0009] In the first aspect, the present invention provides a road seismic isolation subgrade structure, including an embankment, characterized in that it includes, from top to bottom, a high-damping concrete layer, a seismic isolation cushion layer, a concrete bearing layer and a flexible buffer layer arranged in sequence below the embankment, seismic isolation pile holes arranged in an array in the soil below the flexible buffer layer, rubber hole protection sleeves that fit the inner walls of the seismic isolation pile holes and are inserted in the seismic isolation pile holes, seismic isolation trenches excavated along the direction of the road on both sides of the embankment, and rigid seismic isolation piles with heads; wherein the seismic isolation trenches are excavated to a position below the flexible buffer layer, and the seismic isolation trenches and seismic isolation pile holes are filled with a mixture of fine sand and gravel; the rigid seismic isolation piles with heads include A first rigid pile which is sequentially inserted into the isolation pile hole and the flexible buffer layer, a heavy-loaded universal ball bearing, a rigid sleeve, a second rigid pile and a plurality of shock-absorbing dampers are arranged on the top of the first rigid pile; the bottom notch of the rigid sleeve is covered on the top of the first rigid pile and abuts against the heavy-loaded universal ball bearing, and the top of the rigid sleeve abuts against the lower surface of the concrete bearing layer; a plurality of shock-absorbing dampers are evenly arranged in an annular direction around the top of the first rigid pile and horizontally connected between the side wall of the bottom notch of the rigid sleeve and the outer wall of the first rigid pile; the second rigid pile is fixedly connected to the top of the rigid sleeve to form an integral structure and is inserted into the concrete bearing layer.

[0010] Preferably, the seismic isolation cushion layer includes 2-3 layers of rubber sand layers arranged in sequence.

[0011] Preferably, geogrid layers are arranged between adjacent rubber sand layers, between the rubber sand layer of the lowest layer of the seismic isolation cushion and the concrete bearing layer, and between the rubber sand layer of the highest layer of the seismic isolation cushion and the high damping concrete layer.

[0012] Preferably, the rubber sand layer is formed by mixing rubber particles with a diameter of 2 to 5 mm and coarse sand particles with a particle size of 1 to 4 mm.

[0013] Preferably, the thickness of the seismic isolation pad is 300-400 mm, the thickness of the high damping concrete layer is 100-150 mm, the thickness of the concrete bearing layer is 300-500 mm, and the thickness of the flexible buffer layer is 500-800 mm.

[0014] Preferably, the plurality of shock-absorbing dampers are arranged in two layers around the top of the first rigid pile, the length L of the plurality of shock-absorbing dampers is 150-250 mm, the spring stiffness of the upper shock-absorbing dampers is ≥100 N / mm, and the spring stiffness of the lower shock-absorbing dampers is ≥150 N / mm.

[0015] Preferably, the shock-absorbing damper includes a first connecting plate, a shock-absorbing spring, a rubber shock-absorbing block and a second connecting plate which are sequentially connected into an integral structure, a limiting assembly which is covered on the outside of the shock-absorbing spring and connected between the first connecting plate and the rubber shock-absorbing block; the limiting assembly includes 2 to 4 rigid limiting rings which are slidably sleeved in sequence.

[0016] Preferably, the first connecting plate and the second connecting plate are both provided with bolt holes, and the two ends of the shock absorbing damper are respectively fixedly connected to the side wall of the bottom notch of the rigid sleeve and the outer wall of the first rigid pile through the first connecting plate and the second connecting plate by means of bolts cooperating with the bolt holes.

[0017] Preferably, the sleeve rigid seismic isolation pile further comprises a rubber sealing gasket, which is arranged at the gap between the bottom notch of the rigid sleeve and the first rigid pile to prevent soil near the bottom of the rigid sleeve from entering the interior of the rigid sleeve.

[0018] Preferably, the width of the high damping concrete layer is slightly larger than the width of the embankment, and the widths of the high damping concrete layer, the seismic isolation pad, the concrete bearing layer and the flexible buffer layer are the same or increase layer by layer.

[0019] In a second aspect, the present invention provides a seismic isolation road structure, including a surface layer arranged on an embankment, characterized in that it also includes the above-mentioned seismic isolation roadbed structure.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) In the process of earthquake, the deformation of the road will be partially borne by the roadbed, in which the high damping concrete layer can use its own high damping material and seismic isolation performance components to reduce the propagation of high-frequency seismic waves to the upper embankment. The seismic isolation cushion layer is composed of multiple layers of rubber sand layers, which are made of a mixture of rubber particles and sand particles, and can increase the damping ratio between the roadbed and the embankment, absorb high-frequency seismic waves, reduce peak acceleration, and reduce the impact of seismic waves on the road, thereby achieving the effect of seismic isolation.

[0021] (2) The seismic isolation roadbed structure of the present invention has a large vertical bearing capacity. When the road is in use, it bears all the weight and use load of the road, and has a large vertical bearing capacity safety factor, ensuring the safety of the road in use; in the event of a small earthquake, it has sufficient horizontal stiffness, and the horizontal displacement of the upper road is extremely small, which does not affect the use requirements; when a moderate to strong earthquake occurs, the horizontal stiffness of the seismic isolation cushion layer is small, and the upper road slides horizontally, and its natural frequency is greatly extended, away from the natural vibration period of the upper road and the site characteristic period, thereby effectively isolating the ground vibration, significantly reducing the structural seismic response, and being able to absorb high-frequency seismic waves and reduce the peak value of the seismic acceleration transmitted to the bottom of the embankment.

[0022] (3) The seismic isolation roadbed structure of the present invention can control the transmission of the lower seismic motion to the upper embankment, reduce the basic frequency of the embankment vibration, extend the basic period, and avoid the main energy transmission frequency of the earthquake motion to reduce the transmission of seismic energy to the embankment. In this way, the embankment and the ground vibration are relatively separated. At the same time, the energy dissipation of the head-mounted rigid seismic isolation piles can reduce the displacement of the embankment, thereby achieving the purpose of comprehensively reducing the dynamic response of the road and protecting road safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the road seismic isolation subgrade structure of the present invention.

[0024] Figure 2 for Figure 1 A magnified schematic diagram of the local structure.

[0025] Figure 3 for Figure 1 Cross-section view at AA in the middle.

[0026] Figure 4 This is a schematic diagram of the main structure of the sleeve rigid isolation pile.

[0027] Figure 5 for Figure 4 Cross-section at the middle BB.

[0028] Figure 6 It is a schematic diagram of the main structure of the shock-absorbing damper.

[0029] Figure 7 It is a schematic diagram of the dimensions of the sleeve rigid isolation pile; The meanings of the symbols in the above figure are: flexible buffer layer 1, concrete bearing layer 2, seismic isolation cushion layer 3, rubber sand layer 301, high damping concrete layer 4, seismic isolation pile hole 5, rubber hole protection sleeve 6, seismic isolation groove 7, sleeve rigid seismic isolation pile 8, first rigid pile 801, rigid sleeve 802, second rigid pile 803, heavy-loaded universal ball bearing 804, shock-absorbing damper 805, first connecting piece 8051, shock-absorbing spring 8052, rubber shock-absorbing block 8053, second connecting piece 8054, limit assembly 8055, rigid limit ring 8056, rubber sealing gasket 806, geogrid layer 9, embankment 10, natural pavement 11, fine sand and gravel mixture 12, surface layer 13. DETAILED DESCRIPTION

[0030] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The present invention is further described below in conjunction with the accompanying drawings. Example 1

[0031] This embodiment provides a road seismic isolation subgrade structure. Figures 1 to 6 , including an embankment 10, a high-damping concrete layer 4, a seismic isolation cushion layer 3, a concrete bearing layer 2 and a flexible buffer layer 1 arranged in sequence below the embankment 10 from top to bottom, seismic isolation pile holes 5 arranged in an array in the soil below the flexible buffer layer 1, rubber hole protection sleeves 6 that fit the inner walls of the seismic isolation pile holes 5 and are inserted into the seismic isolation pile holes 5, seismic isolation trenches 7 excavated along the road direction on both sides of the embankment 10, and rigid seismic isolation piles 8 with heads; wherein the seismic isolation trenches 7 are excavated to a position below the flexible buffer layer 1, and the seismic isolation trenches 7 and the seismic isolation pile holes 5 are filled with a fine sand and gravel mixture 12; the rigid seismic isolation piles 8 with heads include a first rigid pile 801 that is inserted into the seismic isolation pile hole 5 and the flexible buffer layer 1 from bottom to top, and a A heavy-loaded universal ball bearing 804, a rigid sleeve 802, a second rigid pile 803 and a plurality of shock-absorbing dampers 805 are placed on the top of the first rigid pile 801; the bottom notch of the rigid sleeve 802 is covered on the top of the first rigid pile 801 and abuts against the heavy-loaded universal ball bearing 804, and the top of the rigid sleeve 802 abuts against the lower surface of the concrete bearing layer 2; a plurality of shock-absorbing dampers 805 are evenly arranged in an annular direction around the top of the first rigid pile 801 and are horizontally connected between the side wall of the bottom notch of the rigid sleeve 802 and the outer wall of the first rigid pile 801; the second rigid pile 803 is fixedly connected to the top of the rigid sleeve 802 to form an integral structure and inserted into the concrete bearing layer 2; In the above structure, please refer to Figure 7The first rigid pile 801, the second rigid pile 803 and the rigid sleeve 802 are all prefabricated with concrete. The rigid sleeve 802 and the second rigid pile 803 are prefabricated as a whole, and the first rigid pile 801 is prefabricated separately. The pile diameter D1 of the first rigid pile 801 and the second rigid pile 803 is 500-600 mm, and the pile spacing is 2500-3000 mm; the inner diameter D2 of the notch of the rigid sleeve 802 is 650-850 mm, the outer diameter D3 is 2000-2500 mm, the height H1 is 500-750 mm, and the height H2 is 800-1000 mm. The diameter of the seismic isolation pile hole 5 is 2000-3000 mm, and a rubber hole cover 6 and a fine sand and gravel mixture 12 are arranged inside the hole, which can facilitate the vibration wave to be transmitted to the first rigid pile 801 more evenly; the shock absorbing damper 805 is pre-compressed to ensure that the device can achieve compression and tension bidirectional displacement; the seismic isolation cushion layer 3 is made of a mixture of rubber particles and coarse sand particles to reduce the dynamic shear modulus of the material and increase the damping ratio, so as to give full play to the seismic isolation characteristics of the material; the high damping concrete layer 4 can be made of ordinary concrete with carboxylated styrene butadiene latex, polyester fiber The high damping concrete layer 4 can also achieve vibration isolation by adding vibration isolation components such as air entraining agent and vibration isolation particles; the concrete bearing layer 2 is a conventional reinforced concrete structure, which is connected to the second rigid pile 803 to connect the lower flexible buffer layer 1 and the soil below the flexible buffer layer 1 into an integral structure through the sleeve rigid isolation pile 8 to form a bearing layer; the flexible buffer layer 1 is formed by replacing the original soil with sand, which provides a buffer space for the displacement of the first rigid pile 801 or the relative translation of the soil below the flexible buffer layer 1; The seismic isolation trench 7 and the fine sand and gravel mixture filled in the seismic isolation trench 7 can block the transmission of soil vibration around the high-damping concrete layer 4, the seismic isolation cushion layer 3, and the concrete bearing layer 2, so as to reduce the propagation of high-frequency seismic waves from the surrounding side to the upper embankment; in the sleeve rigid seismic isolation pile 8, the upper part is a rigid sleeve 802 and a second rigid pile 803, and the lower part is a first rigid pile 801. The rigid sleeve 802 can increase the contact area with the concrete bearing layer 2, thereby improving the bearing capacity of the embankment and reducing the bending moment of the rigid pile during an earthquake. The second rigid pile 803 and the top of the rigid sleeve 802 Fixedly connected into an integral structure and inserted into the concrete bearing layer 2, it can prevent the formation of a slip surface, reduce the dynamic response of the embankment, improve the stability of the upper structure, and also prevent the rigid pile from piercing into the seismic isolation cushion 3 due to the vertical stress concentration generated during an earthquake. The top circumference of the first rigid pile 801 is fully connected to the rigid sleeve 802 by a shock-absorbing damper 805. At the same time, the top of the first rigid pile 801 is abutted against the sleeve groove by a heavy-loaded universal ball bearing 804. During an earthquake, the seismic energy can be effectively consumed by the relative displacement caused by the earthquake shaking of the rigid pile and the sleeve.

[0032] The working principle of the present invention is as follows: In the embankment foundation, the embankment and the lower foundation are connected to form a whole. Under normal circumstances, the lower foundation will bear the vertical pressure from the embankment and road traffic. This pressure will be transmitted to the lower bearing layer or the soil around the foundation through the foundation itself. In this case, the sleeve rigid isolation pile foundation can meet the embankment bearing capacity requirements. However, when an earthquake occurs, the strength of the soil itself is destroyed, and the vibration load is directly transmitted from the underground soil to the ground embankment. Due to the action of dynamic loads, the road will be cracked, dislocated, and other damages. Therefore, how to reduce the effect of seismic loads on the road surface, attenuate the transmission of seismic energy to the road during an earthquake, reduce earthquake damage, and improve the seismic resistance of the embankment from the isolation aspect has become the core of seismic isolation in road engineering. In the present invention, the high damping concrete layer 4 can utilize its own high damping material and seismic isolation performance components to reduce the propagation of high-frequency seismic waves to the upper embankment. The seismic isolation cushion layer 3 is composed of multiple layers of rubber sand layers 4. The rubber sand layer 4 is made of rubber particles and sand particles mixed in a certain mass ratio, which can increase the damping ratio between the roadbed and the embankment, absorb high-frequency seismic waves, reduce peak acceleration, and reduce the impact of seismic waves on the road, thereby playing a seismic isolation role. In the present invention, a sleeve rigid seismic isolation pile 8 is driven into the roadbed. The sleeve rigid seismic isolation pile 8 is composed of a first rigid pile 801, a heavy-loaded universal ball bearing 804, a rigid sleeve 802, a second rigid pile 803 and a plurality of shock-absorbing dampers 805, and the first rigid pile 801 is inserted into the seismic isolation pile hole 5 filled with a fine sand and gravel mixture 12, which can make the vibration wave propagate evenly. It is delivered to the first rigid pile 801, and at the same time, the top of the rigid sleeve 802 abuts against the lower surface of the concrete bearing layer 2, which can increase the contact area with the concrete bearing layer 2, thereby improving the bearing capacity of the embankment, and the second rigid pile 803 is fixedly connected to the top of the rigid sleeve 802 to form an integral structure and inserted into the concrete bearing layer 2, so that the sleeve rigid seismic isolation pile 8 connects the concrete bearing layer 2, the flexible buffer layer 1 and part of the soil below the flexible buffer layer 1 into a whole, so that the first rigid pile 801 can be effectively shaken by the earthquake, and the relative displacement between the first rigid pile 801 and the rigid sleeve 802 can consume the seismic energy, thereby playing the role of an energy dissipation device; in addition, the existence of the flexible buffer layer 1 can provide a buffer space for the displacement of the first rigid pile 801 or the relative translation of the soil below the flexible buffer layer 1. When the seismic isolation roadbed structure of the present invention is adopted, the normal driving of the road is not affected when an earthquake does not occur, and the head-mounted rigid seismic isolation piles 8 can meet the bearing capacity requirements of the embankment; during an earthquake, the seismic isolation structure can increase the damping ratio between the embankment and the roadbed, can significantly attenuate the amplitude of seismic vibrations, accelerate the dissipation of seismic energy, and ultimately reduce the impact of seismic loads on road surfaces, can effectively alleviate the destructive pressure of vibration loads directly acting on the embankment, have a good seismic isolation effect, and significantly reduce the degree of damage to roads caused by earthquakes, which has significant economic and social significance.

[0033] Further, in a preferred embodiment, see Figure 1 and Figure 2 The seismic isolation pad 3 includes 2-3 layers of rubber sand layers 301 arranged in sequence; geogrid layers 9 are arranged between adjacent rubber sand layers 301, between the rubber sand layer 301 of the bottom layer of the seismic isolation pad 3 and the concrete bearing layer 2, and between the rubber sand layer 301 of the top layer of the seismic isolation pad 3 and the high damping concrete layer 4; wherein, a geogrid layer 9 is added in the middle of each layer, and the geogrid layer uses glass fiber geogrid, so as to form mechanical interlocking to limit and hinder the lateral movement of each layer, prevent the seismic isolation pad from lateral displacement, and avoid deformation of the seismic isolation pad.

[0034] Furthermore, in a preferred embodiment, a geocell is arranged inside the rubber sand layer 301, and the geocell is a high-strength welded HDPE cell. The net bag effect increases the contact pressure between the rubber sand particles, limits the development of the shear band, and makes the damping ratio of the rubber sand always proportional to the shear strain amplitude.

[0035] Furthermore, in a preferred embodiment, the rubber sand layer 301 is formed by mixing rubber particles with a diameter of 2 to 5 mm and coarse sand particles with a diameter of 1 to 4 mm. The rubber particles can be made of waste tires or industrial rubber.

[0036] Furthermore, in a preferred embodiment, the thickness of the seismic isolation pad 3 is 300-400 mm, the thickness of the high damping concrete layer 4 is 100-150 mm, the thickness of the concrete bearing layer 2 is 300-500 mm, and the thickness of the flexible buffer layer 1 is 500-800 mm.

[0037] Further, in a preferred embodiment, see Figure 4 The plurality of shock-absorbing dampers 805 are arranged in two layers around the top of the first rigid pile 801. The lengths L of the plurality of shock-absorbing dampers 805 are all 150-250 mm. The spring stiffness of the upper shock-absorbing damper 805 is ≥100 N / mm, and the spring stiffness of the lower shock-absorbing damper 805 is ≥150 N / mm. Since the spring stiffnesses of the two layers of shock-absorbing dampers 805 are different, when tilting and torsion occur, different bending moments are generated due to the different stiffnesses, thereby preventing the torsion from continuing to occur.

[0038] Further, in a preferred embodiment, see Figure 6The shock-absorbing damper 805 includes a first connecting piece 8051, a shock-absorbing spring 8052, a rubber shock-absorbing block 8053 and a second connecting piece 8054 which are sequentially connected to form an integral structure, and a limiting component 8055 which is covered on the outside of the shock-absorbing spring 8051 and connected between the first connecting piece 8051 and the rubber shock-absorbing block 8053; the limiting component 8055 includes 2 to 4 rigid limiting rings 8055 which are slidably sleeved in sequence; since the limiting component 8052 includes multiple rigid rings 8053, the shock-absorbing damper is pre-compressed during installation, and when a compression displacement occurs, the rigid rings 8053 will shrink layer by layer until the last layer is left and it will no longer be able to move, and when stretched, when the four layers of rigid rings 8053 are fully unfolded, they will no longer be able to move further.

[0039] Further, in a preferred embodiment, see Figures 4 to 6 The first connecting piece 8051 and the second connecting piece 8054 are both provided with bolt holes, and the two ends of the shock-absorbing damper 805 are respectively fixedly connected to the side wall of the bottom slot of the rigid sleeve 802 and the outer wall of the first rigid pile 801 through the first connecting piece 8051 and the second connecting piece 8054 by means of bolts and bolt holes.

[0040] Further, in a preferred embodiment, see Figure 4 The sleeve rigid seismic isolation pile 8 also includes a rubber sealing gasket 806, which is arranged in the gap between the bottom notch of the rigid sleeve 802 and the first rigid pile 801 to prevent the soil near the bottom of the rigid sleeve 802 from entering the interior of the rigid sleeve 802.

[0041] Furthermore, in a preferred embodiment, the width of the high damping concrete layer 4 is slightly larger than the width of the embankment 10, and the widths of the high damping concrete layer 4, the seismic isolation pad 3, the concrete bearing layer 2 and the flexible buffer layer 1 are the same or increase layer by layer. Example 2

[0042] This embodiment provides a seismic isolation road structure, which includes a surface layer 13 arranged on an embankment 10 and the seismic isolation roadbed structure described in Example 1. Example 3

[0043] This embodiment provides a construction method for the road seismic isolation subgrade structure of the present invention. Figure 1 and Figure 2, including the following steps: prefabricate the sleeve rigid seismic isolation pile 8 according to the design requirements; drill the seismic isolation pile hole 5 according to the pile spacing position of the sleeve rigid seismic isolation pile 8 on the roadbed, install the rubber hole protection sleeve 6 in the seismic isolation pile hole 5, fill the seismic isolation pile hole 5 with a fine sand and gravel mixture 12, and drive the sleeve rigid seismic isolation pile 8 into the seismic isolation pile hole 5, so that the first rigid pile 801 is inserted into the fine sand and gravel mixture 12 in the seismic isolation pile hole 5, and then tamp the fine sand and gravel mixture 12 to make it dense; use sand to pave the flexible buffer layer 1, so that the height of the sand-paved flexible buffer layer 1 just reaches the top position of the rigid sleeve 802, then tie the steel bars on the flexible buffer layer 1 and pour concrete to form a concrete bearing layer 2; then lay the geogrid layer 9 and the rubber sand layer 301 on the concrete bearing layer 2 in sequence, and perform vibration compaction on each layer to form a seismic isolation pad 3; lay the high damping concrete layer 4 on the seismic isolation pad 3, and also lay the geogrid layer 9 between the high damping concrete layer 4 and the seismic isolation pad 3 for stratification. Finally, the seismic isolation trench 7 is excavated along the road direction on both sides of the embankment 10, and the seismic isolation trench 7 is filled with a fine sand and gravel mixture 12.

Claims

1. A road seismic isolation subgrade structure, comprising an embankment (10), characterized in that The invention comprises a high damping concrete layer (4), a seismic isolation cushion layer (3), a concrete bearing layer (2) and a flexible buffer layer (1) arranged in sequence from top to bottom below the embankment (10); seismic isolation pile holes (5) arranged in an array in the soil below the flexible buffer layer (1); a rubber hole protection sleeve (6) fitted to the inner wall of the seismic isolation pile hole (5) and inserted into the seismic isolation pile hole (5); seismic isolation trenches (7) excavated along the road direction on both sides of the embankment (10); and rigid seismic isolation piles (8) with sleeves; wherein the seismic isolation trenches (7) are excavated to a position below the flexible buffer layer (1); the seismic isolation trenches (7) and the seismic isolation pile holes (5) are filled with a fine sand and gravel mixture (12); the rigid seismic isolation piles (8) with sleeves comprise a first rigid pile (801) inserted into the seismic isolation pile hole (5) and the flexible buffer layer (1) in sequence from bottom to top. , a heavy-load universal ball bearing (804), a rigid sleeve (802), a second rigid pile (803) and a plurality of shock-absorbing dampers (805) are arranged on the top of the first rigid pile (801); the bottom notch of the rigid sleeve (802) is covered on the top of the first rigid pile (801) and abuts against the heavy-load universal ball bearing (804), and the top of the rigid sleeve (802) abuts against the lower surface of the concrete bearing layer (2); the plurality of shock-absorbing dampers (805) are evenly arranged in an annular direction around the top of the first rigid pile (801) and are horizontally connected between the side wall of the bottom notch of the rigid sleeve (802) and the outer wall of the first rigid pile (801); the second rigid pile (803) and the top of the rigid sleeve (802) are fixedly connected to form an integral structure and inserted into the concrete bearing layer (2).

2. A road seismic isolation subgrade structure as claimed in claim 1, characterized in that: The seismic isolation cushion layer (3) comprises 2-3 layers of rubber sand layers (301) arranged in sequence.

3. A road seismic isolation subgrade structure as claimed in claim 2, characterized in that: Geogrid layers (9) are arranged between adjacent rubber sand layers (301), between the rubber sand layer (301) at the bottom of the seismic isolation cushion layer (3) and the concrete bearing layer (2), and between the rubber sand layer (301) at the top of the seismic isolation cushion layer (3) and the high damping concrete layer (4).

4. A road seismic isolation subgrade structure as claimed in claim 2, characterized in that: The rubber sand layer (301) is formed by mixing rubber particles with a diameter of 2 to 5 mm and coarse sand particles with a particle size of 1 to 4 mm.

5. The road seismic isolation subgrade structure according to claim 1, characterized in that: The thickness of the seismic isolation cushion layer (3) is 300-400 mm, the thickness of the high damping concrete layer (4) is 100-150 mm, the thickness of the concrete bearing layer (2) is 300-500 mm, and the thickness of the flexible buffer layer (1) is 500-800 mm.

6. The road seismic isolation subgrade structure according to claim 1, characterized in that: The plurality of shock absorbing dampers (805) are arranged in two layers around the top of the first rigid pile (801); the length L of the plurality of shock absorbing dampers (805) is 150-250 mm; the spring stiffness of the shock absorbing dampers (805) in the upper layer is ≥100 N / mm; and the spring stiffness of the shock absorbing dampers (805) in the lower layer is ≥150 N / mm.

7. A road seismic isolation subgrade structure as claimed in claim 6, characterized in that: The shock-absorbing damper (805) comprises a first connecting piece (8051), a shock-absorbing spring (8052), a rubber shock-absorbing block (8053) and a second connecting piece (8054) which are sequentially connected to form an integral structure; a limiting component (8055) which is sleeved outside the shock-absorbing spring (8051) and connected between the first connecting piece (8051) and the rubber shock-absorbing block (8053); the limiting component (8055) comprises 2 to 4 rigid limiting rings (8056) which are slidably sleeved in sequence.

8. The road seismic isolation subgrade structure according to claim 7, characterized in that: The first connecting piece (8051) and the second connecting piece (8054) are both provided with bolt holes, and the two ends of the shock absorbing damper (805) are respectively fixedly connected to the side wall of the bottom notch of the rigid sleeve (802) and the outer wall of the first rigid pile (801) through the first connecting piece (8051) and the second connecting piece (8054) by means of bolts cooperating with the bolt holes.

9. The road seismic isolation subgrade structure according to claim 1, characterized in that: The sleeve rigid seismic isolation pile (8) further comprises a rubber sealing gasket (806), which is arranged at the gap between the bottom notch of the rigid sleeve (802) and the first rigid pile (801) to prevent soil near the bottom of the rigid sleeve (802) from entering the interior of the rigid sleeve (802).

10. A seismic isolation road, comprising a surface layer arranged on an embankment (10), characterized in that: It also includes the seismic isolation roadbed structure according to claims 1 to 9.

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