CN114960305A - High-speed railway subgrade lower expansive soil foundation reinforcing structure and construction method - Google Patents
High-speed railway subgrade lower expansive soil foundation reinforcing structure and construction method Download PDFInfo
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- CN114960305A CN114960305A CN202210449106.4A CN202210449106A CN114960305A CN 114960305 A CN114960305 A CN 114960305A CN 202210449106 A CN202210449106 A CN 202210449106A CN 114960305 A CN114960305 A CN 114960305A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/008—Drainage of track
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses a high-speed railway subgrade lower expansive soil foundation reinforcing structure which comprises a bionic pile body structure, a lateral expansion reducing functional body structure, an expansive soil foundation, a twisted-pair hexagonal check-rail net laminated layer structure and a high-speed railway subgrade structure; the expansion soil foundation is internally provided with a plurality of bionic pile body structures and lateral expansion reducing functional body structures and comprises an expansion soil foundation stable area at the lower part and an expansion soil foundation active area at the upper part; the bionic pile body structure vertically penetrates through the expansive soil foundation active area along the length direction and extends into the expansive soil foundation stable area; the lateral expansion reducing functional body structure is vertically arranged in the expansive soil foundation active area; arranging steps stacked in a snakeskin scale shape are arranged on the surface of the bionic pile structure in the range of the expansion soil foundation active area; the lateral bulk reducing functional body structure comprises a uniformly mixed flexible discrete material and a rigid discrete material. The invention also discloses a construction method of the expansive soil foundation reinforcing structure under the high-speed railway foundation.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering expansive soil foundation reinforcement treatment, and particularly relates to a high-speed railway subgrade lower expansive soil foundation reinforcement structure and a construction method.
Background
According to the specifications of high-speed railway design specifications (TB 10621-2014), the allowable settlement of the high-speed railway foundation is less than 15mm, and the allowable settlement is limited by the adjustment range of the fastener, and the raised deformation of the roadbed should be less than 4 mm. Therefore, the control requirements of the high-speed railway on the deformation of the raised roadbed and the deformation of the subsidence are very strict. However, expansive soil is special soil with remarkable expansion and contraction deformation characteristics under the condition of changing moisture content. Influenced by the expansion and shrinkage deformation characteristics of expansive soil, the bulging deformation and the settlement deformation of the high-speed rail roadbed in the expansive soil area easily exceed the standard control requirements, and roadbed deformation disasters are caused. Engineering practices show that even slightly expansive soil bodies can cause roadbed deformation diseases. Therefore, it is necessary to provide reasonable measures to control the uplift deformation and the settlement deformation of the roadbed, which is related to the operation safety of the high-speed railway roadbed in the expansive soil area. The foundation engineering of the high-speed railway built in the expansive soil area is constructed under the influence of conditions such as line elevation, longitudinal slope gradient, landform and peripheral environment, and the foundation bed structure of the foundation engineering is located on the expansive soil foundation. Therefore, a key technical problem of avoiding the overlarge uplift deformation and settlement deformation of the high-speed railway foundation is a control measure for the uplift deformation and settlement deformation of the expansive soil foundation under the high-speed railway foundation.
And the traditional control measures are as follows: the method comprises a physical and chemical improvement method, a horizontal expansion reducing layer, a deep water seepage blind ditch, a totally-closed drainage preventing layer, a CFG pile reinforcing method and the like, wherein the deformation development of the expansive soil foundation can be inhibited and slowed down to a certain degree, but in a complex climate and geological environment, the long-term control effect of the deformation of the expansive soil foundation cannot meet the high standard requirement of high-speed railway foundation engineering, and roadbed deformation diseases are generated continuously.
Patent document CN201710609816 discloses a ballastless track railway expanded dirt road-cutting structure and a construction method, which comprises the following steps: the cement fly ash gravel piles are transversely and longitudinally arranged in rows at intervals to form a composite foundation in the expansive soil foundation, and the arrangement depth of the cement fly ash gravel piles exceeds the atmospheric influence thickness of the expansive soil; the elastic geotechnical section is arranged in the surface layer of the expansive soil foundation between two rows of transversely adjacent cement fly ash gravel piles and extends longitudinally along the expansive soil foundation; the cushion layer structure is filled on the top of the composite foundation layer by layer; the foundation bed bottom layer is filled on the top of the cushion layer structure in a layered mode, and the foundation bed surface layer is filled on the top of the foundation bed bottom layer in a layered mode; and the drainage side ditches are arranged at two sides of the cutting structure, and the bottom of the drainage side ditches is provided with a longitudinal blind ditch. This patent relies on the elastic property of elasticity geotechnological section bar directly to release the vertical deformation of inflation soil foundation, reduces the uplift of inflation soil then and warp, nevertheless has the excessive problem of vertical deformation of release, and very easy suitable it is opposite, makes the inflation soil foundation subside to warp to exceed standard on the contrary.
Patent document CN201810424707 discloses an anti-bulging structure of a cutting bed of an expansive soft rock ballastless track and a construction method, wherein the anti-bulging structure comprises a cutting bed bottom layer filled on an expansive soft rock base, deep energy dissipation holes and shallow energy dissipation holes are arranged in a rock mass of the expansive soft rock base at intervals in the transverse direction and the longitudinal direction on the cutting bed surface, energy dissipation bodies are filled in the deep energy dissipation holes and the shallow energy dissipation holes, and sealing plugs are pressed into upper ports of the deep energy dissipation holes and the shallow energy dissipation holes to form sealing. And a deformation monitoring element anchored into the rock mass body of the expanded soft rock basement is arranged between the deep energy dissipation hole and the shallow energy dissipation hole. The energy dissipation hole of this patent has reduced the bearing capacity of inflation soil foundation to make and to subside deformation control unable satisfaction to inflation soil foundation.
Patent document CN201911168759 discloses an expansive soil foundation structure containing a ballastless track roadbed and a construction method thereof, wherein the expansive soil foundation structure comprises a porous pipe pile, an expansive soil foundation, a geosynthetic material reinforced cushion layer and a ballastless track roadbed, the porous pipe pile and the expansive soil foundation are arranged at the lowest part, and the geosynthetic material reinforced cushion layer and the ballastless track roadbed are sequentially arranged above the porous pipe pile and the expansive soil foundation from bottom to top; the vertical many porous tubular piles that are provided with in the inflation soil foundation, porous tubular pile includes hollow porous pile body and fills the elastomer material in it, hollow porous pile body is hollow reinforced concrete structure, porous tubular pile still includes the radial through-hole that upwards link up hollow porous pile body inside and outside wall. The patent can realize the simultaneous control of the uplift deformation and the settlement deformation of the expansive soil foundation, but is only suitable for the soil environment with smaller particle size of expansive soil particles.
For high-speed railway roadbed, the swelling deformation and the settlement deformation of the expansive soil foundation are required to be simultaneously controlled within the regulation and control requirements, and the condition that the swelling deformation and the settlement deformation are not considered can not occur. Meanwhile, a reinforcing structure measure is also needed to be applicable to the geological environment of the expansive soil with various soil particle sizes and different expansion grades. The existing reinforcement measures can not solve the problems, so that the deformation diseases of the high-speed railway foundation engineering in the expansive soil area are still serious, and the construction of the high-speed railway roadbed in the expansive soil area still faces huge difficulties and technical bottlenecks.
Therefore, a new expansive soil foundation reinforcing structure under the high-speed railway foundation and a construction method need to be designed.
Disclosure of Invention
The invention aims to provide a reinforcement structure and a construction method of an expansive soil foundation under a high-speed railway foundation, and aims to solve the problems that the existing reinforcement measures proposed in the background technology are difficult to meet the requirements of controlling the uplift deformation and the settlement deformation of the expansive soil foundation within the standard control requirements at the same time, the conditions of considering the uplift deformation and the settlement deformation are not generated, and the requirements of being suitable for the geological environment of the expansive soil with various soil particle sizes and different expansion grades are difficult to meet.
In order to achieve the aim, the invention provides a high-speed railway subgrade lower expansive soil foundation reinforcing structure which comprises a bionic pile body structure, a lateral expansion reducing functional body structure, an expansive soil foundation, a twisted-pair hexagonal check-guest net laminated layer structure and a high-speed railway subgrade structure;
a plurality of bionic pile body structures and lateral expansion reducing functional body structures are arranged in the expansive soil foundation along the depth direction, and the expansive soil foundation comprises an expansive soil foundation stable area at the lower part and an expansive soil foundation active area at the upper part; the bionic pile body structure vertically penetrates through the expansive soil foundation active area along the length direction and extends into the expansive soil foundation stable area; the lateral expansion reducing functional body structure is vertically arranged in an expansion soil foundation active area;
arranging steps stacked in a snakeskin scale shape are arranged on the surface of the bionic pile structure in the range of the expansion soil foundation active area;
the lateral expansion reducing functional body structure comprises a flexible discrete material and a rigid discrete material which are uniformly mixed;
the top surface of the expansive soil foundation is provided with a twisted hexagonal check net superposed layer structure;
a high iron-based bed structure is arranged on the top surface of the twisted hexagonal gabion mesh laminated layer structure;
the double-twisted hexagonal lattice-guest net laminated layer structure comprises a double-twisted hexagonal lattice-guest net, a flexible material and/or a soil filler.
In a specific embodiment, the bionic pile body structure is formed by pouring reinforced concrete in advance, the outer diameter of the bionic pile body structure is not more than 0.8m, an included angle formed by the inclined plane of the arrangement steps stacked in a snakeskin scale shape and the length direction of the bionic pile body structure is 2-12 degrees, the length of each arrangement step in the length direction of the bionic pile body structure is 0.10-0.35 m, the overlapping length between adjacent arrangement steps is 0.05-0.10 m, and the maximum protruding thickness in the pile diameter direction of the bionic pile body structure is 0.01-0.05 m.
In a specific embodiment, the cross section of the bionic pile body structure is circular or square, and the bionic pile body structure is distributed along a horizontal plane in the expansive soil foundation in a rhombic or parallelogram mode; the cross section of the lateral expansion reducing functional body structure is circular or square, the lateral expansion reducing functional body structure is distributed in the expansive soil foundation along the horizontal plane in a rhombic or parallelogram mode, and the lateral expansion reducing functional body structure is arranged at the center of an area defined by four adjacent bionic pile body structures.
In a particular embodiment, the double-twisted hexagonal lattice-guest net laminated-layer structure includes a flexible interlayer disposed at a lower portion and a rigid interlayer disposed at an upper portion, the flexible interlayer including a double-twisted hexagonal lattice-guest net and a flexible material disposed above and below the double-twisted hexagonal lattice-guest net, and the rigid interlayer including a double-twisted hexagonal lattice-guest net and a soil filler disposed above and below the double-twisted hexagonal lattice-guest net.
In a specific embodiment, the flexible interlayer has a thickness of 0.15m to 0.25m, and the rigid interlayer has a thickness of 0.25m to 0.45 m.
In a specific embodiment, the flexible material is rubber particles without cohesive force, and the particle size of the rubber particles is more than 0.005 m; the soil filler is a group A filler which accords with high speed railway design specifications.
In a specific embodiment, the double-twisted hexagonal lattice-guest net is a net structure twisted by plastic-coated steel wires and provided with hexagonal net holes, the length of the net hole size is not more than 0.12m, the width of the net hole size is not more than 0.10m, and the diameter of the plastic-coated steel wires is 2.2 mm-5.0 mm.
In a specific embodiment, the upper surface of the double twisted hexagonal gabion mesh laminated structure is set to have a slope for water drainage of 2.5% to 5.5%, and drainage ditches are provided at the side surfaces of the double twisted hexagonal gabion mesh laminated structure.
In a specific embodiment, the ratio of the mass of the flexible discrete materials to the mass of the rigid discrete materials in the lateral debulking functional body structure is 1: 0.1 to 10.
The invention also provides a construction method of the expansive soil foundation reinforcement structure under the high-speed railway foundation, which comprises the following steps:
s1: determining specific design parameters of the reinforcement structure of the expansive soil foundation under the high-speed railway foundation according to the expansion characteristics and the hydrogeological data of the expansive soil foundation on the construction site;
s2: in a stirring field, mixing and stirring the flexible bulk material and the rigid bulk material to prepare a lateral expansion reducing functional body material;
s3: in a prefabricated field, according to the parameters of the steps which are stacked in a snakeskin scale shape on the surface of the bionic pile structure, manufacturing a corresponding template of the bionic pile structure, and finishing template assembly;
s4: binding reinforcing steel bars according to the size of the bionic pile body structure and the design requirement of reinforcing steel bar arrangement, and placing the binding reinforcing steel bars in a template of the assembled bionic pile body structure; pouring concrete, curing and forming, removing the template after the concrete strength of the bionic pile body structure reaches the strength required by the design, continuously curing to the designed strength of the concrete, and transferring the bionic pile body structure to a construction site by using a transportation engineering vehicle;
s5: trimming the expansive soil foundation on a construction site to enable the expansive soil foundation to meet site working requirements before construction; paying off according to the design layout, drilling a lead hole with the depth not less than 1.5m by using a drilling machine, putting the bionic pile body structure into the drilled lead hole, and pressing the whole length of the bionic pile body structure into the expansive soil foundation by using a pile press; constructing the bionic pile body structure according to a pile jumping mode;
s6: according to the designed pay-off position, a rotary drilling rig is used for drilling a drill hole with the depth reaching the top surface of the expansive soil foundation stabilization area, and then the drill hole is filled with a lateral expansion reducing functional body material to form a lateral expansion reducing functional body structure;
s7: laying a twisted-pair hexagonal check net laminated layer structure on the top surface of the expansive soil foundation;
s8: and filling foundation bed fillers on the top surface of the twisted hexagonal check net laminated layer structure and compacting to a designed compaction degree to form the high iron-based bed structure.
Compared with the prior art, the invention has the following beneficial effects:
the expansive soil foundation reinforcing structure under the high railway foundation and the construction method can simultaneously reduce the overlarge uplift deformation caused by gene soaking of the expansive soil under the high railway foundation and the overlarge settlement deformation caused by water loss, ensure that the uplift deformation and the settlement deformation of the expansive soil foundation are simultaneously controlled within the standard requirements, and further ensure the service safety of the high railway foundation in the expansive soil region.
Under the action of soaking, the expansive soil foundation generates expansion pressure and lateral deformation, and the lateral expansion reducing functional body structure is extruded to play a lateral expansion reducing effect, so that the expansion potential and the bulging deformation of the expansive soil foundation are reduced. Meanwhile, the boundary action of the bionic pile body structure and expansive soil forms constraint on the expansive soil between the bionic pile body structures, wherein the arrangement steps stacked in a snakeskin scale shape on the surface of the bionic pile body structure can improve the friction force of the pile soil boundary, enhance the constraint action on the expansive soil between the bionic pile body structures, and further effectively reduce the swelling deformation of the expansive soil foundation. In addition, the bionic pile body structure and the lateral expansion reducing functional body structure replace a part of expansive soil in the expansive soil foundation, and the bionic pile body structure is also beneficial to reducing the expansion potential and the bulging deformation of the expansive soil foundation. Therefore, the lateral expansion reducing effect of the lateral expansion reducing functional body structure, the interface effect of the bionic pile body structure and the replacement effect of the bionic pile body structure reduce the bulging deformation of the expansive soil foundation together.
Under the dehydration action, the expansive soil foundation is reduced in expansion pressure and contracted to deform, and the lateral expansion reducing functional body structure is deformed in a rebound manner so as to recover the expansive soil foundation to an initial state as far as possible. Meanwhile, the bionic pile body structure and the arrangement steps with the surfaces thereof stacked in a snakeskin scale shape are beneficial to improving the bearing capacity of the expansive soil foundation, and the bearing capacity loss of the expansive soil foundation caused by the lateral expansion reducing functional body structure can be compensated, so that the integral bearing performance of the expansive soil foundation is maintained. In addition, the two hexagonal check guest net superimposed layer structures that are located inflation soil foundation top can transversely transmit high-iron-based bed structure dead weight and train load to bionical pile body structure top through two hexagonal check guest net superimposed layer structures, then transmit to inflation soil foundation stable area depths through bionical pile body structure to reduce the load that coats that the inflation soil foundation activity area soil body bore, thereby ensure that the inflation soil foundation subsides the deformation control effect and is equivalent with traditional stake net composite foundation. Therefore, the resilience performance of the lateral expansion reducing functional body, the interface effect of the bionic pile body structure and the load transverse transmission function of the twisted hexagonal lattice-guest net laminated layer structure jointly reduce the settlement deformation of the expansive soil foundation.
Therefore, the invention can regulate and control the lateral deformation in the expansive soil foundation, further effectively reduce and regulate the expansion potential of the expansive soil foundation, avoid the over-high requirements on the tensile strength of the pile body material and the shear strength of the pile-soil interface, is particularly suitable for dealing with complex environments such as water infiltration, deep and strong expansive soil geology and the like caused by the rising of underground water level and the failure of upper water drainage prevention measures, and has the characteristics of simple construction, low engineering investment, environmental protection and the like.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic illustration of a longitudinal section of an embodiment of the invention;
FIG. 2 is a plan view of the bionic pile structure and the lateral expansion reducing functional body structure in the active area of the expansive soil foundation according to one embodiment of the invention;
FIG. 3 is a structural diagram of a twisted hexagonal lattice-guest net stack structure according to an embodiment of the present invention;
FIG. 4 is a structural diagram of a bionic pile body structure according to an embodiment of the invention;
FIG. 5 is a structural view of a lateral debulking functional body structure according to an embodiment of the present invention;
wherein, 1, bionic pile body structure; 2. a lateral expansion reducing functional body structure; 21. a flexible discrete material; 22. a rigid discrete material; 3. expanding the soil foundation; 31. an expansive soil foundation active zone; 32. an expansive soil foundation stabilization zone; 4. a twisted hexagonal lattice-guest net laminated layer structure; 41. a flexible interlayer; 42. a rigid interlayer; 43. a flexible material; 44. a soil filler; 45. a twisted hexagonal lattice-guest net; 5. a high iron based bed structure; 6. and (7) a drainage ditch.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The invention provides a high-speed railway subgrade lower expansive soil foundation reinforcing structure which comprises a bionic pile body structure 1, a lateral expansion reducing functional body structure 2, an expansive soil foundation 3, a twisted-pair hexagonal lattice-guest net laminated layer structure 4 and a high-speed railway bed structure 5, wherein the bionic pile body structure comprises a pile body structure and a pile body structure;
a plurality of bionic pile body structures 1 and lateral expansion reducing functional body structures 2 are arranged in the expansive soil foundation 3 along the depth direction, and the expansive soil foundation 3 comprises an expansive soil foundation stable area 32 positioned at the lower part and an expansive soil foundation active area 31 positioned at the upper part; the bionic pile body structure 1 vertically penetrates through the expansive soil foundation active area 31 along the length direction and extends into the expansive soil foundation stable area 32; the lateral expansion reducing functional body structure 2 is vertically arranged in the expansion soil foundation active region 31;
arranging steps 11 stacked in a snakeskin scale shape are arranged on the surface of the bionic pile body structure 1 in the range of the expansive soil foundation active area 31;
the lateral expansion-reducing functional body structure 2 comprises a uniformly mixed flexible discrete material 21 and a rigid discrete material 22;
the top surface of the expansive soil foundation 3 is provided with a twisted hexagonal check net superposed layer structure 4;
a high iron-based bed structure 5 is arranged on the top surface of the twisted hexagonal check net laminated layer structure 4;
the double twisted hexagonal lattice-guest net stack-layer structure 4 comprises a double twisted hexagonal lattice-guest net 45, a flexible material 43 and/or a soil filler 44.
The expansive soil foundation active zone 31 is an area which causes vertical expansion and contraction deformation of a soil body in the expansive soil foundation 3 under the influence of climate factors such as temperature, evaporation, rainfall, underground water level fluctuation and the like, and the depth of the area can be determined by combining with local hydrogeological observation data, and can also be determined according to the regulations of relevant specifications if no relevant data exists; the expansive soil foundation stabilization zone 32 is an area where the vertical expansion and contraction deformation of the soil body in the expansive soil foundation 3 is kept unchanged under the influence of climate factors such as temperature, evaporation, rainfall and underground water level fluctuation.
The bionic pile body structure 1 is formed by pouring reinforced concrete in advance, the outer diameter of the bionic pile body structure 1 is not more than 0.8m, the included angle formed between the inclined plane of the arrangement steps 11 stacked in the shape of snakeskin scales and the length direction of the bionic pile body structure 1 is 2-12 degrees, the length of each arrangement step 11 in the length direction of the bionic pile body structure 1 is 0.10-0.35 m, the overlapping length between adjacent arrangement steps 11 is 0.05-0.10 m, and the maximum protruding thickness in the pile diameter direction of the bionic pile body structure 1 is 0.01-0.05 m. The vertical section of the arrangement steps 11 stacked like a snakeskin scale is triangular, and the lower end of the previous step is not exactly butted with the upper end of the next step in the vertical direction, so that the arrangement steps are overlapped.
According to the bionic mechanical characteristics of the efficient friction effect of the snakeskin scales and the ground, the arranging steps 11 stacked in the shape of the snakeskin scales are arranged on the surface of the bionic pile body structure 1 located in the expansion soil foundation active area 31, the pile soil interface friction force can be obviously increased through the structural form of the arranging steps 11, and then the uplift deformation and the settlement deformation of the expansion soil foundation 3 among piles can be effectively inhibited, so that the problem that the uplift deformation and the settlement deformation of the expansion soil foundation 3 cannot be effectively controlled due to the fact that the pile soil interface friction force is insufficient in the traditional reinforcing measure can be solved.
The flexible discrete material 21 in the lateral expansion reducing functional body structure 2 is polystyrene foam, the particle size distribution range of the flexible discrete material is 0.002 m-0.01 m, the rigid discrete material 22 is fine pebbles, and the maximum particle size of the rigid discrete material is not more than 0.005 m. Under the action of the expansion pressure change in the expansive soil foundation 3, the flexible discrete materials 21 play a compression and rebound function, and then the expansion pressure in the expansive soil foundation 3 is regulated and controlled; because the water content change amplitude in the expansive soil foundation 3 is not uniformly distributed along the depth direction, the expansion pressure in the expansive soil foundation 3 is also not uniformly distributed along the depth direction, and the bionic pile body structure 1 is in an unfavorable stress state; the rigid bulk material 22 is doped, so that the mobility of the flexible bulk material 21 in space can be obviously improved, the lateral expansion reducing functional body structure 2 has the characteristic of good space mobility, the characteristic enables the lateral expansion reducing functional body structure 2 to adjust the uneven distribution condition of the expansion pressure in the expansive soil foundation 3 to be changed towards the even distribution condition, the overall expansion potential of the expansive soil foundation 3 is promoted to be evenly reduced, and the stress state on the bionic pile body structure 1 is improved.
The cross section of the bionic pile body structure 1 is circular or square, and the bionic pile body structure is distributed in the expansive soil foundation 3 along the horizontal plane in a rhombic or parallelogram mode; the cross section of the lateral expansion reducing functional body structure 2 is circular or square, the lateral expansion reducing functional body structure 2 is distributed in the expansive soil foundation 3 along the horizontal plane in a rhombic or parallelogram mode, and the lateral expansion reducing functional body structure 2 is arranged at the center of an area enclosed by four adjacent bionic pile body structures 1. Preferably, the cross section of the bionic pile body structure 1 is circular, and the bionic pile body structure is distributed in the expansive soil foundation 3 along the horizontal plane in a rhombic mode. Preferably, the lateral expansion reducing functional body structure 2 is circular, is distributed in the expansive soil foundation 3 along a horizontal plane in a rhombic mode, and is arranged at the center of an area enclosed by every four bionic pile body structures 1.
The twisted hexagonal lattice-guest net laminated layer structure 4 includes a flexible interlayer 41 disposed at a lower portion and a rigid interlayer 42 disposed at an upper portion, the flexible interlayer 41 including a twisted hexagonal lattice-guest net 45 and a flexible material 43 disposed above and below the twisted hexagonal lattice-guest net 45, and the rigid interlayer 42 including a twisted hexagonal lattice-guest net 45 and a soil filler 44 disposed above and below the twisted hexagonal lattice-guest net 45.
The flexible interlayer 41 can adjust the different vertical deformation of the bionic pile body structure 1, the lateral expansion reducing functional body structure 2 and the expansive soil foundation 3, so that the vertical deformation distribution of the surface of the expansive soil foundation 3 is more uniform; the rigid interlayer 42 can bear the dead weight load and the train load of the high iron-based bed structure 5, reduce the nonuniformity of vertical stress distribution on the surface of the expansive soil foundation 3 and increase the stress rationality of the expansive soil foundation 3.
The thickness of the flexible interlayer 41 is 0.15-0.25 m, and the thickness of the rigid interlayer 42 is 0.25-0.45 m.
The flexible material 43 is rubber particles without cohesive force, and the particle size of the rubber particles is more than 0.005 m; the soil filler 44 is a group A filler which meets the design code of high-speed railways.
The twisted-pair hexagonal lattice-guest net 45 is a net sheet structure which is twisted by plastic-coated steel wires and has hexagonal meshes, the length of the mesh size is not more than 0.12m, the width of the mesh size is not more than 0.10m, and the diameter of the plastic-coated steel wires is 2.2 mm-5.0 mm.
The upper surface of the twisted hexagonal check net laminated layer structure 4 is set to a certain gradient for drainage, the gradient set for drainage is 2.5% -5.5%, and a drainage ditch 6 is arranged on the side surface of the twisted hexagonal check net laminated layer structure 4.
The mass ratio of the flexible discrete materials 21 to the rigid discrete materials 22 in the lateral expansion reducing functional body structure 2 is 1: 0.1 to 10.
The invention also provides a construction method of the expansive soil foundation reinforcing structure under the high-speed railway foundation, which comprises the following steps:
s1: determining specific design parameters of the reinforcement structure of the expansive soil foundation under the high-speed railway foundation according to the expansion characteristics and the hydrogeological data of the expansive soil foundation 3 on the construction site;
s2: in a stirring field, mixing and stirring the flexible discrete materials 21 and the rigid discrete materials 22 to prepare lateral expansion-reducing functional body materials;
s3: in a prefabrication field, according to the parameters of the arrangement steps 11 stacked in a snakeskin scale shape on the surface of the bionic pile body structure 1, manufacturing a corresponding template of the bionic pile body structure 1, and completing template assembly;
s4: binding reinforcing steel bars according to the size of the bionic pile body structure 1 and the design requirement of reinforcing steel bar arrangement, and placing the binding reinforcing steel bars in a template of the assembled bionic pile body structure 1; pouring concrete, curing and forming, removing the template after the concrete strength of the bionic pile body structure 1 reaches the strength required by design, continuously curing to the designed strength of the concrete, and transferring the bionic pile body structure 1 to a construction site by using a transportation engineering vehicle;
s5: trimming the expansive soil foundation 3 on a construction site to enable the expansive soil foundation 3 to meet site working requirements before construction; paying off according to the design layout, namely determining the position of a pile hole on the ground, drilling a guide hole with the depth of not less than 1.5m by using a drilling machine, putting the bionic pile body structure 1 into the drilled guide hole, and pressing the whole length of the bionic pile body structure 1 into the expansive soil foundation 3 by using a pile press; the bionic pile body structure 1 is constructed according to a pile jumping mode;
s6: according to the designed pay-off position, a rotary drilling rig is used for drilling a drill hole with the depth reaching the top surface of the expansive soil foundation stabilization zone 32, and then the drill hole is filled with a lateral expansion reducing functional body material to form a lateral expansion reducing functional body structure 2;
s7: laying a twisted-pair hexagonal check net laminated layer structure 4 on the top surface of the expansive soil foundation 3;
s8: and filling foundation bed fillers on the top surface of the twisted hexagonal check net laminated layer structure 4 and compacting to a designed compaction degree to form a high iron base bed structure 5.
Under the effect of an actual immersion environment, the expansive soil foundation 3 is immersed to generate expansion pressure and lateral deformation, and the lateral expansion reducing functional body structure 2 is extruded to play a lateral expansion reducing effect, so that the expansion potential and the bulging deformation of the expansive soil foundation 3 are reduced. Meanwhile, the boundary action of the bionic pile body structure 1 and expansive soil forms constraint on the expansive soil between the bionic pile body structures 1, wherein the arrangement steps 11 which are piled up in a snakeskin scale shape on the surface of the bionic pile body structure 1 can improve the friction force of the pile soil boundary, enhance the constraint action on the expansive soil between the bionic pile body structures 1, and further effectively reduce the swelling deformation of the expansive soil foundation. In addition, the bionic pile body structure 1 and the lateral expansion reducing functional body structure 2 replace a part of expansive soil in the expansive soil foundation 3, and the bionic pile body structure is also beneficial to reducing the expansion potential and the bulging deformation of the expansive soil foundation 3. Therefore, the lateral expansion reducing effect of the lateral expansion reducing functional body structure 2, the interface effect of the bionic pile body structure 1 and the replacement effect of the bionic pile body structure and the interface effect reduce the bulging deformation of the expansive soil foundation 3 together.
Under the effect of an actual dehydration environment, the expansive soil foundation 3 loses water and is subjected to expansion pressure reduction and contraction deformation, and the lateral expansion reducing functional body structure 2 is subjected to rebound deformation so as to recover the expansive soil foundation 3 to an initial state as far as possible. Meanwhile, the bionic pile body structure 1 and the arrangement steps 11 with the surfaces stacked in the shape of the snakeskin scales are beneficial to improving the bearing capacity of the expansive soil foundation 3, and the bearing capacity loss of the expansive soil foundation 3 caused by the lateral expansion reducing functional body structure 2 can be compensated, so that the integral bearing performance of the expansive soil foundation 3 is maintained. In addition, the two hexagonal check guest net superimposed layer structures 4 that are located inflation soil foundation 1 top can be with 5 dead weights of high iron-based bed structure and train load, through two hexagonal check guest net superimposed layer structures 4 transversely transmit to bionical pile body structure 1 top, transmit to inflation soil foundation stable area 32 depths through bionical pile body structure 1 then to reduce the load that coats that the 31 soil bodies of inflation soil foundation active area bore, thereby ensure that 3 settlement deformation control effects of inflation soil foundation are equivalent with traditional stake net composite foundation. Therefore, the resilience performance of the lateral expansion reducing functional body 2, the interface effect of the bionic pile body structure 1 and the load transverse transmission function of the twisted hexagonal lattice-guest net laminated layer structure 4 jointly reduce the settlement deformation of the expansive soil foundation 3. Therefore, the invention can regulate and control the lateral deformation in the expansive soil foundation 3, further effectively reduce and regulate the expansion potential of the expansive soil foundation 3, avoid the over-high requirements on the tensile strength of a pile body material and the shearing strength of a pile soil interface, simultaneously reduce the over-large uplift deformation caused by water immersion and the over-large settlement deformation caused by water loss of the expansive soil foundation 3 under the high-speed railway foundation, ensure that the uplift deformation and settlement deformation of the expansive soil foundation 3 are simultaneously controlled within the standard requirements, and further ensure the service safety of the high-speed railway foundation in the expansive soil region.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions and substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. The high-speed railway subgrade lower expansive soil foundation reinforcing structure is characterized by comprising a bionic pile body structure (1), a lateral expansion reducing functional body structure (2), an expansive soil foundation (3), a twisted hexagonal check net laminated layer structure (4) and a high-speed railway subgrade structure (5);
a plurality of bionic pile body structures (1) and lateral expansion reducing functional body structures (2) are arranged in the expansive soil foundation (3) along the depth direction, and the expansive soil foundation (3) comprises an expansive soil foundation stable area (32) positioned at the lower part and an expansive soil foundation active area (31) positioned at the upper part; the bionic pile body structure (1) vertically penetrates through the expansive soil foundation active area (31) along the length direction and extends into the expansive soil foundation stable area (32); the lateral expansion reducing functional body structure (2) is vertically arranged in the expansion soil foundation active area (31);
arranging steps (11) stacked in a snakeskin scale shape are arranged on the surface of the bionic pile body structure (1) in the range of the expansion soil foundation active area (31);
the lateral expansion-reducing functional body structure (2) comprises a flexible bulk material (21) and a rigid bulk material (22) which are uniformly mixed;
the top surface of the expansive soil foundation (3) is provided with a twisted hexagonal lattice-guest net superposed layer structure (4);
a high iron-based bed structure (5) is arranged on the top surface of the twisted hexagonal check net laminated layer structure (4);
the double-twisted hexagonal lattice-guest net laminated layer structure (4) comprises a double-twisted hexagonal lattice-guest net (45), a flexible material (43) and/or a soil filler (44).
2. The expansive soil foundation reinforcement structure under the high-speed railway foundation according to claim 1, wherein the bionic pile body structure (1) is cast in advance by reinforced concrete, the outer diameter of the bionic pile body structure (1) is not more than 0.8m, an included angle formed between the inclined plane of the arrangement steps (11) stacked in a snakeskin scale shape and the length direction of the bionic pile body structure (1) is 2-12 degrees, the length of each arrangement step (11) in the length direction of the bionic pile body structure (1) is 0.10-0.35 m, the overlapping length between adjacent arrangement steps (11) is 0.05-0.10 m, and the maximum protruding thickness in the pile diameter direction of the bionic pile body structure (1) is 0.01-0.05 m.
3. The reinforcement structure of the expansive soil foundation under the high-speed railway foundation according to claim 1, wherein the cross section of the bionic pile body structure (1) is circular or square, and is distributed along a horizontal plane in the expansive soil foundation (3) in a rhombic or parallelogram mode; the cross section of the lateral expansion reducing functional body structure (2) is circular or square, the lateral expansion reducing functional body structure is distributed in the expansive soil foundation (3) along the horizontal plane in a rhombic or parallelogram mode, and the lateral expansion reducing functional body structure (2) is arranged in the center of an area defined by four adjacent bionic pile body structures (1).
4. The expansive soil foundation stabilization structure under high-speed railway subgrade as claimed in claim 1, characterized in that said twisted-pair hexagonal gabion mesh laminated-layer structure (4) comprises a flexible interlayer (41) disposed on the lower part and a rigid interlayer (42) disposed on the upper part, the flexible interlayer (41) comprises a twisted-pair hexagonal gabion mesh (45) and a flexible material (43) disposed above and below the twisted-pair hexagonal gabion mesh (45), and the rigid interlayer (42) comprises a twisted-pair hexagonal gabion mesh (45) and a soil filler (44) disposed above and below the twisted-pair hexagonal gabion mesh (45).
5. The expansive soil foundation reinforcement structure under the high-speed railway subgrade, according to claim 4, is characterized in that the thickness of the flexible interlayer (41) is 0.15-0.25 m, and the thickness of the rigid interlayer (42) is 0.25-0.45 m.
6. The expansive soil foundation stabilization structure under high-speed railway foundation according to claim 1, wherein the flexible material (43) is rubber particles without cohesive force, and the particle size of the rubber particles is more than 0.005 m; the soil filler (44) is a group A filler which accords with high speed railway design specifications.
7. The expansive soil foundation stabilization structure under the high-speed railway foundation as claimed in claim 1, wherein said double twisted hexagonal lattice-guest net (45) is a net structure twisted by plastic-covered steel wires and having hexagonal meshes, the length of the mesh size is not more than 0.12m, the width of the mesh size is not more than 0.10m, and the diameter of the plastic-covered steel wires is 2.2 mm-5.0 mm.
8. The expansive soil foundation stabilization structure under high-speed railway subgrade as claimed in claim 1, characterized in that the upper surface of said double-twisted hexagonal gabion mesh-laminated structure (4) is set to a slope for water drainage, the slope for water drainage is set to 2.5% -5.5%, and drainage ditches (6) are provided at the side of the double-twisted hexagonal gabion mesh-laminated structure (4).
9. The structure for consolidating an expansive soil foundation under a high-speed railway foundation according to claim 1, characterized in that the ratio of the mass of the flexible discrete materials (21) to the mass of the rigid discrete materials (22) in the lateral expansion-reducing functional body structure (2) is 1: 0.1 to 10.
10. A construction method of a high-speed railway subgrade lower expansive soil foundation reinforcing structure is characterized by comprising the following steps:
s1: determining specific design parameters of the reinforcement structure of the expansive soil foundation under the high-speed railway foundation according to the expansion characteristics and the hydrogeological data of the expansive soil foundation (3) on the construction site, wherein the specific design parameters are as defined in any one of the claims 1 to 9;
s2: in a stirring field, mixing and stirring the flexible discrete material (21) and the rigid discrete material (22) to prepare a lateral expansion-reducing functional body material;
s3: in a prefabrication field, according to the parameters of the arrangement steps (11) which are piled in a snakeskin scale shape on the surface of the bionic pile body structure (1), manufacturing corresponding templates of the bionic pile body structure (1), and finishing template assembly;
s4: binding steel bars according to the size of the bionic pile body structure (1) and the design requirement of arranging the steel bars, and placing the bound steel bars in a template of the assembled bionic pile body structure (1); pouring concrete, curing and forming, removing the template after the concrete strength of the bionic pile body structure (1) reaches the strength required by design, continuously curing to the designed strength of the concrete, and transferring the bionic pile body structure (1) to a construction site by using a transportation engineering vehicle;
s5: trimming the expansive soil foundation (3) on a construction site to enable the expansive soil foundation (3) to meet site working requirements before construction; paying off according to the design layout, drilling a lead hole with the depth not less than 1.5m by using a drilling machine, putting the bionic pile body structure (1) into the drilled lead hole, and pressing the whole length of the bionic pile body structure (1) into the expansive soil foundation (3) by using a pile press; the bionic pile body structure (1) is constructed according to a pile jumping mode;
s6: according to the designed pay-off position, a rotary drilling rig is used for drilling a drill hole with the depth reaching the top surface of the expansive soil foundation stabilization area (32), and then the drill hole is filled with a lateral expansion reducing functional body material to form a lateral expansion reducing functional body structure (2);
s7: laying a twisted-pair hexagonal check net laminated layer structure (4) on the top surface of the expansive soil foundation (3);
s8: and filling foundation bed fillers on the top surface of the twisted hexagonal check net laminated layer structure (4) and compacting to a designed compaction degree to form a high iron base bed structure (5).
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| CN115419056A (en) * | 2022-09-08 | 2022-12-02 | 中铁二院工程集团有限责任公司 | Reinforcing structure for resisting foundation expansion and contraction deformation and design method |
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