A subgrade filling support structure for steep slope soft overburden

Abstract

The embodiment of the present application provides a kind of embankment filling support structure for steep slope soft overburden, comprising: front anti-slide pile, rear anti-slide pile, connecting component and retaining wall;Front anti-slide pile is set to the position below the slope foot of steep slope, and one end of front anti-slide pile is embedded in stable stratum;Rear anti-slide pile is set to the position below the slope top of steep slope, and one end of rear anti-slide pile is embedded in stable stratum;Wherein, rear anti-slide pile and front anti-slide pile are arranged in parallel along the width direction of steep slope, and rear anti-slide pile and front anti-slide pile extend along the length direction of steep slope;Connecting component is connected with the other end of front anti-slide pile and the other end of rear anti-slide pile respectively;Retaining wall is connected via connecting component and front anti-slide pile.The setting of the embodiment of the present application provides a kind of support structure which is not easy to deform and has higher stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of geotechnical engineering slope support, and in particular to a subgrade filling support structure for steep slope soft cover layer. BACKGROUND

[0002] The steep slope in mountainous area refers to the surface with large slope and nearly vertical slope, and the slope usually exceeds the critical value (such as 15° or 25°), which has significant topographic steepness and geological risk. The soft cover layer of steep slope in mountainous area refers to the loose, low strength and high compressibility soil layer or accumulation body distributed on the surface of steep slope, which is related to weathering, gravity transport and hydrological effect, and has significant engineering geological hazards.

[0003] In related technologies, the support structure such as retaining wall, pile foundation beam, pile board wall or reinforced soil retaining wall is usually used for reinforcement and protection of steep slope in mountainous area.

[0004] However, due to the characteristics of loose, low strength and the like of soft cover layer, the vertical foundation bearing capacity of traditional support structure is insufficient, the lateral deformation is too large, which leads to that the subgrade, overall stability or local stability does not meet the safety condition. CONTENT OF THE INVENTION

[0005] The embodiment of the present application provides a subgrade filling support structure for steep slope soft cover layer, so as to solve the technical problem that the vertical foundation bearing capacity of traditional support structure is insufficient, the lateral deformation is too large, which leads to that the subgrade, overall stability or local stability does not meet the safety condition due to the characteristics of loose, low strength and the like of soft cover layer in related technologies.

[0006] The embodiment of the present application provides a subgrade filling support structure for steep slope soft cover layer, which comprises: front anti-slide pile, rear anti-slide pile, connecting assembly and retaining wall;

[0007] The front anti-slide pile is arranged at the position below the slope toe of the steep slope, and one end of the front anti-slide pile is embedded in the stable stratum;

[0008] The rear anti-slide pile is arranged at the position below the slope top of the steep slope, and one end of the rear anti-slide pile is embedded in the stable stratum; wherein the rear anti-slide pile and the front anti-slide pile are arranged side by side along the width direction of the steep slope, and the rear anti-slide pile and the front anti-slide pile extend along the length direction of the steep slope;

[0009] The connecting assembly is connected with the other end of the front anti-slide pile and the other end of the rear anti-slide pile respectively;

[0010] The retaining wall is connected with the front anti-slide pile and the connecting assembly.

[0011] In an implementation, the supporting structure further comprises a steel strand, one end of the steel strand is arranged at the connecting assembly near the front anti-slide pile, and the other end of the steel strand is sequentially threaded through the connecting assembly and the rear anti-slide pile and fixed to the bedrock bottom layer through the grouting body.

[0012] In an implementation, the connecting assembly comprises a front crown beam, a rear crown beam and a connecting pile cap plate.

[0013] One end of the front crown beam is connected with the other end of the front anti-slide pile, and the other end of the front crown beam is connected with one end of the connecting pile cap plate.

[0014] One end of the rear crown beam is connected with the other end of the rear anti-slide pile, and the other end of the rear crown beam is connected with the other end of the connecting pile cap plate.

[0015] In an implementation, the other end of the front crown beam is provided with a first groove, the first groove has a first side wall and a second side wall adjacent to the first side wall, a first end wall of one end of the connecting pile cap plate and the first side wall are matched with each other, and one end of a third side wall of the connecting pile cap plate facing the stratum and the second side wall are matched with each other.

[0016] The other end of the rear crown beam is provided with a second groove, the second groove has a fourth side wall and a fifth side wall adjacent to the fourth side wall, a second end wall of the other end of the connecting pile cap plate and the fourth side wall are matched with each other, and the other end of a third side wall of the connecting pile cap plate facing the stratum and the fifth side wall are matched with each other.

[0017] In an implementation, the connecting pile cap plate is provided with a plurality of communication holes arranged at intervals along the length direction of the steep slope, and the steel strand is threaded through the communication holes.

[0018] One end of the steel strand is fixed to the front crown beam through an anchor head, and the other end of the steel strand is sequentially threaded through the communication holes, the rear crown beam, the rear anti-slide pile and fixed to the bedrock bottom layer through the grouting body.

[0019] In an implementation, the supporting structure further comprises a directional pulley, a first fixing member and a second fixing member.

[0020] The directional pulley is arranged at one end of the communication hole near the rear crown beam, one end of the first fixing member is fixed to the connecting pile cap plate, the other end of the first fixing member extends along the width direction of the steep slope and fixes the center of the directional pulley, one end of the second fixing member is fixed to the rear anti-slide pile, and the other end of the second fixing member extends along the height direction of the steep slope and fixes the center of the directional pulley.

[0021] In an implementation, a retaining plate is arranged at the side of the front anti-slide pile near the rear anti-slide pile, and the retaining plate extends from the front anti-slide pile to the front crown beam.

[0022] In a feasible implementation, the retaining wall is provided with a first angle steel, a second angle steel, a first bolt, a second bolt and a third bolt on the side facing the steep slope;

[0023] The supporting structure further comprises a geotextile grid, the first connecting section of the first angle steel is fixed to the retaining wall through the first bolt, the first connecting section of the second angle steel is fixed to the retaining wall through the second bolt, and one end of the geotextile grid is fixed between the second connecting section of the first angle steel and the second connecting section of the second angle steel through the third bolt.

[0024] In a feasible implementation, the supporting structure further comprises a connecting rod, the connecting rod is connected to the other end of the geotextile grid, and the connecting rod extends along the length direction of the steep slope;

[0025] A steel sleeve hinge is arranged along the extension direction of the connecting rod, one end of the steel sleeve hinge is connected to the connecting rod, the other end of the steel sleeve hinge is connected to a steel anchor rod, and the steel anchor rod is fixed to the slope bedrock through a grouting anchor.

[0026] In a feasible implementation, the supporting structure further comprises a grouting reinforcement, the grouting reinforcement is arranged on the slope away from the back anti-slide pile, and the grouting reinforcement extends into the steep slope surface from the steep slope surface perpendicularly to the steep slope surface, so as to reinforce the soft overburden.

[0027] In the embodiment, the front anti-slide pile is arranged at the slope toe position, and the back anti-slide pile is arranged at the position below the slope top, the front anti-slide pile and the back anti-slide pile are arranged, so as to resist the sliding force of the rock and soil along the length direction of the steep slope, and transmit the load to the stable bedrock in the vertical direction, thereby avoiding the overall sliding and settlement cracking of the steep slope, and improving the stability of the overall structure. Further, the other end of the front anti-slide pile and the other end of the back anti-slide pile are connected through the connecting assembly, the load of the upper filling body of the connecting assembly is transmitted to the bedrock through the connecting assembly, that is, a larger bearing capacity is provided for the vertical foundation of the supporting structure, thereby avoiding the settlement problem caused by the soft overburden, and improving the stability of the overall structure. Through the arrangement of the embodiment, a supporting structure which is not easy to deform and has high stability is provided. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the principles of the present application, and do not limit the present application in any manner. In the drawings:

[0029] Figure 1 is a cross-sectional schematic view of a subgrade filling and supporting structure for a steep slope soft overburden;

[0030] Figure 2is a schematic diagram of a connecting pile cap plate of a subgrade filling support structure for steep slope soft overburden;

[0031] Figure 3 is Figure 1 is a schematic diagram of a connecting pile cap plate and a rear crown beam connection in the middle;

[0032] Figure 4 is Figure 1 is a partial enlarged schematic diagram of A in the middle;

[0033] Figure 5 is Figure 1 is a partial enlarged schematic diagram of B in the middle;

[0034] Figure 6 is a partial schematic diagram of a grouting reinforcement body.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 101-front anti-slide pile; 1011-soil retaining plate;

[0037] 201-rear anti-slide pile;

[0038] 301-connection assembly; 3011-front crown beam; 3012-rear crown beam; 3013-connecting pile cap plate; 301a-communication hole; 3014-temporary support structure;

[0039] 401-seal anchor head; 402-grouting body;

[0040] 501-soil retaining wall; 5011-first angle steel; 5012-second angle steel; 5013-first bolt; 5014-second bolt; 5015-third bolt; 5016-geotextile grid; 5017-connection rod; 5018-steel sleeve hinge; 5019-steel anchor bar; 5020-grouting anchoring member; 5021-grouting reinforcement body;

[0041] 601-steel strand; 602-directional pulley; 6021-first fixing member; 6022-second fixing member;

[0042] 700-soft overburden;

[0043] 800-bedrock bottom layer. DETAILED DESCRIPTION

[0044] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0045] It should be noted that in the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other manners different from the description herein, therefore, the protection scope of the present application is not limited by the specific implementation manner disclosed below.

[0046] Mountain steep slope refers to a slope surface with large slope and nearly vertical, and the slope usually exceeds a critical value (such as 15° or 25°), and has significant topographic steepness and geological risk. The soft cover layer of mountain steep slope refers to a loose, low-strength, high-compressibility soil layer or accumulation body distributed on the surface of steep slope, and the cause is related to weathering, gravity transport and hydrological effect, and has significant engineering geological hazards.

[0047] In the related art, the mountain steep slope is usually reinforced and protected by supporting structures such as retaining wall, pile foundation beam, pile board wall or reinforced soil retaining wall.

[0048] However, due to the characteristics of loose, low-strength and the like of the soft cover layer, the traditional supporting structure has problems such as insufficient vertical foundation bearing capacity, excessive lateral deformation, and unsatisfied safety conditions of roadbed, overall stability or local stability.

[0049] Therefore, the present application provides a roadbed filling supporting structure for soft cover layer of mountain steep slope to solve the technical problem that the traditional supporting structure has insufficient vertical foundation bearing capacity, excessive lateral deformation, and unsatisfied safety conditions of roadbed, overall stability or local stability due to the characteristics of loose, low-strength and the like of the soft cover layer in the related art.

[0050] Figure 1 A cross-sectional schematic view of a roadbed filling supporting structure for steep slope soft cover layer.

[0051] With reference to Figure 1 The present application provides a roadbed filling supporting structure for steep slope soft cover layer, comprising: front anti-slide pile 101, rear anti-slide pile 201, connecting assembly 301 and retaining wall 501.

[0052] The front anti-slide pile 101 is arranged at a position below the slope toe of the steep slope, and one end of the front anti-slide pile 101 is embedded in the stable stratum.

[0053] The rear anti-slide pile 201 is arranged at a position below the top of the steep slope, and one end of the rear anti-slide pile 201 is embedded in a stable stratum; wherein the rear anti-slide pile 201 and the front anti-slide pile 101 are arranged side by side along the width direction of the steep slope, and the rear anti-slide pile 201 and the front anti-slide pile 101 extend along the length direction of the steep slope;

[0054] The connecting assembly 301 connects the other end of the front anti-slide pile 101 and the other end of the rear anti-slide pile 201, respectively;

[0055] The retaining wall 501 is connected with the front anti-slide pile 101 through the connecting assembly 301.

[0056] It should be noted that, as shown by the arrow in the figure, Figure 1 The x represents the width direction of the steep slope, the y represents the length direction of the steep slope, and the z represents the height direction of the steep slope.

[0057] For example, one end of the front anti-slide pile 101 and one end of the rear anti-slide pile 201 are embedded in the stable stratum at the position, and the embedding depth of the front anti-slide pile 101 and the rear anti-slide pile 201 needs to meet the stability requirement and the construction requirement, and at the same time meet the settlement requirement under the upper load.

[0058] For example, a filling body is arranged above the connecting assembly 301, that is, between the retaining wall 501 and the steep slope.

[0059] For example, the retaining wall 501 is provided with a drain hole along the vertical direction or the width direction of the steep slope, so as to drain the infiltrated rainwater in the filling body.

[0060] In the embodiment of the application, the front anti-slide pile 101 is arranged at the toe position, and the rear anti-slide pile 201 is arranged at the position below the top of the steep slope, and through the arrangement of the front anti-slide pile 101 and the rear anti-slide pile 201, the sliding force of the rock and soil along the length direction of the steep slope can be resisted, and the load in the vertical direction can be transmitted to the stable bedrock, so as to avoid the overall sliding and settlement cracking of the steep slope, and improve the stability of the overall structure. Further, the other end of the front anti-slide pile 101 and the other end of the rear anti-slide pile 201 are connected through the connecting assembly 301, so as to transmit the load of the filling body above the connecting assembly 301 to the bedrock through the connecting assembly 301, that is, to provide a larger bearing capacity for the vertical foundation of the supporting structure, so as to avoid the settlement problem caused by the soft overburden layer, and improve the overall structural stability. Through the arrangement of the embodiment of the application, a supporting structure which is not easy to deform and has high stability is provided.

[0061] Figure 2 It is a schematic view of a connecting pile cap plate of a roadbed filling supporting structure for a steep slope soft overburden layer; Figure 3 It is Figure 1A schematic view of a connection between the connecting platform and the rear crown beam.

[0062] In some examples, with reference to Figures 1 to 3 The supporting structure further comprises a steel strand 601, one end of the steel strand 601 is arranged at the end of the connecting assembly 301 close to the front anti-slide pile 101, and the other end of the steel strand 601 penetrates the connecting assembly 301 and the rear anti-slide pile 201 in sequence and is fixed to the bedrock bottom layer through the grouting body 402.

[0063] wherein, Figure 1 The soft overburden layer 700 and the bedrock bottom layer 800 are shown in the middle.

[0064] The embodiment of the present application can prevent external objects and external forces from disturbing the steel strand 601 by penetrating the steel strand 601 in the connecting assembly 301. That is, when the upper filling body load causes the connecting assembly 301 to deform, the steel strand 601 can still freely stretch and contract because it penetrates the connecting assembly 301, thereby avoiding the loss of prestress of the steel strand 601 caused by the constraint of concrete. Further, the embodiment of the present application can provide additional anti-slide force for the supporting structure by arranging one end of the steel strand 601 at the end of the connecting assembly 301 close to the front anti-slide pile 101 and fixing the other end of the steel strand 601 to the bedrock bottom layer through the grouting body 402, so as to further inhibit the deformation of the supporting structure and improve the structural stability of the supporting structure.

[0065] For example, with reference to Figures 1 to 3 The connecting assembly 301 comprises a front crown beam 3011, a rear crown beam 3012, and a connecting platform 3013;

[0066] One end of the front crown beam 3011 is connected to the other end of the front anti-slide pile 101, and the other end of the front crown beam 3011 is connected to one end of the connecting platform 3013;

[0067] One end of the rear crown beam 3012 is connected to the other end of the rear anti-slide pile 201, and the other end of the rear crown beam 3012 is connected to the other end of the connecting platform 3013.

[0068] For example, a temporary supporting structure 3014 is arranged on the side of the rear crown beam 3012 away from the front crown beam 3011, and the temporary supporting structure 3014 is arranged away from the stratum by the front crown beam 3011. In specific implementation, the temporary supporting structure 3014 can be a prefabricated steel sheet pile or an I-beam, and the embedded depth of the temporary supporting structure 3014 needs to meet the stability requirement. The temporary supporting structure 3014 is pulled out and recycled after the backfill body behind the retaining wall reaches the top elevation of the temporary supporting structure 3014, and is filled with grouting material.

[0069] The application can connect the front and rear crown beams 3011 and 3012 by the connection cushion plate 3013, enhance the overall rigidity of the front and rear anti-slide piles 201, make the upper filling body load be transmitted to the bedrock through the connection cushion plate 3013, reduce the lateral deformation of the supporting structure, and improve the overall stability.

[0070] In some examples, continuing to refer to Figure 1 The other end of the front crown beam 3011 is provided with a first groove having a first side wall and a second side wall adjacent to the first side wall, the first end wall and the first side wall of one end of the connection cushion plate 3013 are matched with each other, and the third side wall of one end of the connection cushion plate 3013 facing the stratum and the second side wall are matched with each other.

[0071] The other end of the rear crown beam 3012 is provided with a second groove having a fourth side wall and a fifth side wall adjacent to the fourth side wall, the second end wall and the fourth side wall of the other end of the connection cushion plate 3013 are matched with each other, and the third side wall of the other end of the connection cushion plate 3013 facing the stratum and the fifth side wall are matched with each other.

[0072] In specific implementation, the first side wall and the second side wall of the front crown beam 3011 form an “L” shape, and the four side walls and the fifth side wall of the rear crown beam 3012 also form an “L” shape.

[0073] The application can limit the two ends of the connection cushion plate 3013 through the first groove and the second groove formed by the front crown beam 3011 and the rear crown beam 3012, and improve the stability of the supporting structure.

[0074] In some examples, continuing to refer to Figures 1 to 3 The connection cushion plate 3013 is provided with a plurality of communication holes 301a along the length direction of the steep slope, and the steel strand 601 penetrates through the communication holes 301a.

[0075] One end of the steel strand 601 is fixed to the front crown beam 3011 through the sealing anchor head 401, and the other end of the steel strand 601 sequentially passes through the communication hole 301a, the rear crown beam 3012, the rear anti-slide pile 201, and is fixed to the bedrock bottom layer through the grouting body 402.

[0076] In the embodiment of the present application, by arranging the steel strand 601 in the communication hole 301a, when the deformation of the tie deck slab 3013 is caused by the load of the filling body located at the upper part of the tie deck slab 3013, the steel strand 601 can still freely stretch in the communication hole 301a, thereby avoiding the loss of prestress of the steel strand 601. Further, by fixing one end of the steel strand 601 to the front corbel 3011 through the sealing anchor head 401 and fixing the other end of the steel strand 601 to the bedrock bottom layer through the grouting body 402, the deformation of the supporting structure can be further controlled, and the supporting structure is more safe and reliable.

[0077] For example, continuing to refer to Figures 1 to 3 The supporting structure further comprises a directional pulley 602, a first fixing member 6021 and a second fixing member 6022.

[0078] The directional pulley 602 is arranged at one end of the communication hole 301a close to the rear corbel 3012, one end of the first fixing member 6021 is fixed to the tie deck slab 3013, the other end of the first fixing member 6021 extends along the width direction of the steep slope and fixes the center of the directional pulley 602, one end of the second fixing member 6022 is fixed to the rear anti-slide pile 201, and the other end of the second fixing member 6022 extends along the height direction of the steep slope and fixes the center of the directional pulley 602.

[0079] The first fixing member 6021 and the second fixing member 6022 can fix the directional pulley 602, the directional pulley 602 can change the stress direction of the steel strand 601, i.e., the stress of the steel strand 601 along the width direction of the steep slope is changed to the stress along the height direction of the steep slope, thereby supporting the supporting structure from the width direction and the height direction of the steep slope, avoiding the deformation of the supporting structure, and improving the stability of the supporting structure.

[0080] For example, continuing to refer to Figure 1 The front anti-slide pile 101 is provided with a retaining plate 1011 on the side close to the rear anti-slide pile 201, and the retaining plate 1011 extends from the front anti-slide pile 101 to the front corbel 3011.

[0081] For example, the retaining plate 1011 is provided with water discharge through holes (not shown) in the length direction and the vertical direction of the steep slope, so as to discharge the infiltrated underground water in the rear edge of the steep slope and the filling body.

[0082] The retaining plate 1011 can prevent the sliding of the rear edge filling body of the front anti-slide pile 101, and further improve the stability of the supporting structure.

[0083] Figure 4 is Figure 1A local enlarged view of the middle A; Figure 5 is Figure 1 A local enlarged view of the middle B.

[0084] In another first implementation, referring to Figure 4 and Figure 5 The retaining wall 501 is provided with a first angle steel 5011, a second angle steel 5012, a first bolt 5013, a second bolt 5014 and a third bolt 5015 on one side of the steep slope;

[0085] The supporting structure further comprises a geotextile grid 5016, a first connecting section of the first angle steel 5011 is fixed to the retaining wall 501 through the first bolt 5013, a first connecting section of the second angle steel 5012 is fixed to the retaining wall 501 through the second bolt 5014, and one end of the geotextile grid 5016 is fixed between a second connecting section of the first angle steel 5011 and a second connecting section of the second angle steel 5012 through the third bolt 5015.

[0086] The first angle steel 5011, the second angle steel 5012, the first bolt 5013, the second bolt 5014 and the third bolt 5015 are arranged to fix the geotextile grid 5016 in the filling body, and the flexible reinforced cushion layer is formed through the laying of the geotextile grid 5016 layer, so as to coordinate the uneven cracking of the filling body, thereby further improving the stability of the supporting structure. The geotextile grid 5016 can play a certain “locking” role on the filler in the filling body, thereby reducing the pressure of the filler in the filling body on the retaining wall 501, and further reducing the deformation of the retaining wall 501.

[0087] For example, continuing to refer to Figure 4 and Figure 5 The supporting structure further comprises a connecting rod 5017, the connecting rod 5017 is connected to the other end of the geotextile grid 5016, and the connecting rod 5017 extends along the length direction of the steep slope.

[0088] A steel sleeve hinge 5018 is arranged along the extension direction of the connecting rod 5017, one end of the steel sleeve hinge 5018 is connected to the connecting rod 5017, and the other end of the steel sleeve hinge 5018 is connected to a steel anchor rod 5019, and the steel anchor rod 5019 is fixed in the slope bedrock through a grouting anchor 5020.

[0089] In the embodiment of the present application, the geotextile grille 5016, the retaining wall 501, the steel anchor rod 5019 and the grouting anchoring member 5020 are connected as a whole through the first angle steel 5011, the second angle steel 5012, the first bolt 5013, the second bolt 5014, the connecting rod 5017 and the rigid sleeve winding drum, so that a continuous force transmission chain can be formed, the filler pressure in the filling body is transmitted to the bedrock in turn through the geotextile grille 5016, the connecting rod 5017, the steel anchor rod 5019 and the grouting anchoring member 5020, stress is avoided to be concentrated on the retaining wall 501, the deformation of the retaining wall 501 is reduced, and the stability of the supporting structure is improved.

[0090] Figure 6 is a partial schematic view of the grouting reinforcement body.

[0091] For example, referring to Figure 6 The supporting structure further includes a grouting reinforcement body 5021, the grouting reinforcement body 5021 is arranged on the slope away from the rear anti-slide pile 201, and the grouting reinforcement body 5021 is extended inwardly from the steep slope surface perpendicularly to the steep slope surface to reinforce the soft and weak overburden layer.

[0092] For example, the grouting reinforcement body 5021 can be provided with an angle steel barb type steel pipe for internal grouting, a steel flower pipe is provided with a plurality of grout outlet holes arranged symmetrically along the periphery of the steel pipe, and a welded angle steel barb is used to prevent silt from blocking the holes; the steel flower pipe grouting material is cement slurry with a water-cement ratio of 0.50, and the slurry strength is M30, so as to ensure full grouting.

[0093] The embodiment of the present application can make the loose soft and weak overburden layer become a whole through the arrangement of the grouting reinforcement body, reduce the sliding force of the soft and weak overburden layer, ensure the safety of the steep slope, and enhance the stability of the supporting structure.

[0094] It is easy to understand that, on the basis of the several embodiments provided in the present application, other embodiments can be obtained by combining, splitting, recombining, etc. of the embodiments of the present application, and these embodiments do not exceed the protection scope of the present application.

[0095] The above specific embodiments have further detailed the purposes, technical solutions and beneficial effects of the embodiments of the present application, and it should be understood that the above is only the specific embodiment of the present application, and is not used to limit the protection scope of the embodiments of the present application, and any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A roadbed embankment support structure for steep slopes with weak overburden, characterized in that, include: Front anti-slide piles, rear anti-slide piles, connecting components, and retaining walls; The front anti-slide pile is set below the toe of the steep slope, and one end of the front anti-slide pile is embedded in the stable stratum. The rear anti-slide pile is located below the top of the steep slope, and one end of the rear anti-slide pile is embedded in a stable stratum; wherein, the rear anti-slide pile and the front anti-slide pile are arranged side by side along the width direction of the steep slope, and the rear anti-slide pile and the front anti-slide pile extend along the length direction of the steep slope; The connecting components are respectively connected to the other end of the front anti-slide pile and the other end of the rear anti-slide pile; The retaining wall is connected to the connecting assembly and the front anti-slide pile.

2. The roadbed embankment support structure for steep slopes with weak overburden layers according to claim 1, characterized in that, The support structure also includes steel strands, one end of which is located at the end of the connecting assembly near the front anti-slide pile, and the other end of which passes through the connecting assembly and the rear anti-slide pile in sequence and is fixed to the bedrock layer by grouting.

3. The roadbed embankment support structure for steep slopes with weak overburden layers according to claim 2, characterized in that, The connecting components include a front crown beam, a rear crown beam, and a connecting base plate; One end of the front cap beam is connected to the other end of the front anti-slide pile, and the other end of the front cap beam is connected to one end of the connecting pile cap plate; One end of the rear cap beam is connected to the other end of the rear anti-slip pile, and the other end of the rear cap beam is connected to the other end of the connecting pile cap plate.

4. A roadbed embankment support structure for steep slopes with weak overburden layers according to claim 3, characterized in that, The other end of the front crown beam is provided with a first groove, the first groove having a first sidewall and a second sidewall adjacent to the first sidewall, the first end wall of one end of the connecting support plate and the first sidewall are adapted to each other, and the end of the third sidewall of the connecting support plate facing the stratum is adapted to the second sidewall. The other end of the rear crown beam is provided with a second groove, the second groove having a fourth sidewall and a fifth sidewall adjacent to the fourth sidewall, the second end wall of the other end of the connecting support plate and the fourth sidewall are adapted to each other, and the other end of the third sidewall of the connecting support plate facing the stratum and the fifth sidewall are adapted to each other.

5. A roadbed embankment support structure for steep slopes with weak overburden layers according to claim 3, characterized in that, The connecting support plate is provided with a plurality of connecting holes at intervals along the length of the steep slope, and the steel strand passes through the connecting holes; One end of the steel strand is fixed to the front crown beam by a sealing anchor head, and the other end of the steel strand is fixed to the bedrock layer by passing through the connecting hole, the rear crown beam, the rear anti-slide pile and the grouting body in sequence.

6. A roadbed embankment support structure for steep slopes with weak overburden layers according to claim 5, characterized in that, The support structure also includes a directional pulley, a first fixing member, and a second fixing member; The directional pulley is disposed at one end of the connecting hole near the rear crown beam. One end of the first fixing member is fixed to the connecting bearing plate, and the other end of the first fixing member extends along the width direction of the steep slope and fixes the center of the directional pulley. One end of the second fixing member is fixed to the rear anti-slide pile, and the other end of the second fixing member extends along the height direction of the steep slope and fixes the center of the directional pulley.

7. A roadbed embankment support structure for steep slopes with weak overburden layers according to claim 3, characterized in that, A retaining plate is provided on the side of the front anti-slide pile near the rear anti-slide pile, and the retaining plate extends from the front anti-slide pile toward the front cap beam.

8. A roadbed embankment support structure for steep slopes with weak overburden layers according to claim 1, characterized in that, The retaining wall is provided with a first angle steel, a second angle steel, a first bolt, a second bolt, and a third bolt on the side facing the steep slope; The support structure also includes a geotextile grid, wherein the first connecting section of the first angle steel is fixed to the retaining wall by a first bolt, the first connecting section of the second angle steel is fixed to the retaining wall by a second bolt, and one end of the geotextile grid is fixed between the second connecting section of the first angle steel and the second connecting section of the second angle steel by a third bolt.

9. A roadbed embankment support structure for steep slopes with weak overburden layers according to claim 8, characterized in that, The support structure also includes a connecting rod, which is connected to the other end of the geotextile grid and extends along the length of the steep slope. A steel sleeve hinge is provided along the extension direction of the connecting rod. One end of the steel sleeve hinge is connected to the connecting rod, and the other end of the steel sleeve hinge is connected to the steel anchor rod. The steel anchor rod is fixed in the bedrock of the slope by grouting anchors.

10. A roadbed embankment support structure for steep slopes with weak overburden layers according to any one of claims 1-9, characterized in that, The support structure also includes a grouting reinforcement body, which is installed on the slope opposite to the anti-slide pile, and the grouting reinforcement body extends inward from the steep slope surface perpendicular to the steep slope surface to reinforce the weak overburden layer.

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