Immersed tunnel foundation reinforcing structure and construction method

Abstract

The invention discloses an immersed tube tunnel foundation reinforcing structure and a construction method, and relates to the technical field of foundation reinforcement, the immersed tube tunnel foundation reinforcing structure comprises a foundation and a plurality of gravel piles, the gravel piles penetrate through the foundation, each gravel pile comprises a geosynthetic material, first gravel and a reinforcing piece, and the geosynthetic materials are arranged in a surrounding mode to form a hollow columnar structure; the geosynthetics arranged in the surrounding mode are filled with first broken stones, and the reinforcing pieces are arranged in the geosynthetics arranged in the surrounding mode; and the gabion layer and the second gravel are arranged on the gravel pile in the height direction, the gabion layer is arranged above the gravel pile and connected with the reinforcing piece, and the gabion layer is filled with the second gravel. Therefore, the gravel piles penetrate through the foundation, and the gabion layer is arranged above the gravel piles and is connected with the reinforcers, so that the risks of instability and non-uniform settlement of the immersed tunnel foundation under the action of strong shock or load can be reduced, and the bearing capacity and rigidity of the immersed tunnel foundation are remarkably improved; and the anti-seismic property and the stability of the immersed tunnel foundation can be improved.

Description

Technical Field

[0001] This invention relates to the field of foundation reinforcement technology, and in particular to a foundation reinforcement structure for immersed tunnels and a construction method for such a structure. Background Technology

[0002] In related technologies, the foundation usually needs to be reinforced before the construction of immersed tunnels in order to improve the bearing capacity of the foundation, reduce settlement and enhance seismic performance. However, the existing foundation reinforcement structure design of immersed tunnels is unreasonable, and it is prone to instability and uneven settlement under strong earthquakes or loads, resulting in poor stability and seismic performance of the immersed tunnel foundation. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a foundation reinforcement structure for immersed tunnels, which can effectively reduce the risk of instability and uneven settlement of the immersed tunnel foundation under strong earthquakes or loads, and can improve the stability and seismic performance of the immersed tunnel foundation.

[0004] The present invention further proposes a construction method for a foundation reinforcement structure for immersed tunnels.

[0005] The immersed tunnel foundation reinforcement structure according to the present invention includes: a foundation, a plurality of crushed stone piles, wherein the crushed stone piles are inserted into the foundation, and each crushed stone pile includes: geosynthetic material, first crushed stone, and a reinforcing member, wherein the geosynthetic material is arranged in a circular manner to form a hollow columnar structure, the first crushed stone is filled inside the surrounding geosynthetic material, and the reinforcing member is disposed inside the surrounding geosynthetic material; a gabion layer and a second crushed stone, wherein along the height direction, the gabion layer is disposed above the crushed stone piles and connected to the reinforcing member, and the second crushed stone is filled inside the gabion layer.

[0006] The immersed tunnel foundation reinforcement structure according to the present invention, by inserting crushed stone piles into the foundation and placing a gabion layer above the crushed stone piles and connecting it with the reinforcing member, can effectively reduce the risk of instability and uneven settlement of the immersed tunnel foundation under strong earthquakes or loads, significantly improve the bearing capacity and stiffness of the immersed tunnel foundation, and is conducive to improving the seismic performance and stability of the immersed tunnel foundation.

[0007] In some examples of the present invention, the gabion layer includes: a plurality of gabion units, a plurality of first connectors, two adjacent gabion units being connected by the first connectors, and the gabion units being filled with the second crushed stone.

[0008] In some examples of the present invention, the gabion unit includes: a gabion body, a gabion cover, and a sliding rod. The gabion body defines a filling space with one open end, the filling space being filled with the second crushed stone. The gabion cover is movably disposed on the gabion body and can cover the open end of the filling space. The sliding rod is slidably disposed on the gabion body and can support the gabion cover, so that the filling space is open.

[0009] In some examples of the present invention, the immersed tunnel foundation reinforcement structure further includes: a connecting tie rod, the connecting tie rod being connected between the reinforcing member and the gabion layer.

[0010] In some examples of the present invention, the reinforcing member is formed with a tie rod connection port, and the gabion layer further includes: a second connector, wherein the tie rod passes through the tie rod connection port to connect with the reinforcing member, and the tie rod is connected to the second connector.

[0011] In some examples of the present invention, the reinforcing member includes: a first sub-reinforcing member, a second sub-reinforcing member, and a connecting rib. Both the first sub-reinforcing member and the second sub-reinforcing member are constructed as ring-shaped members. The first sub-reinforcing member is sleeved on the outside of the second sub-reinforcing member and connected to the second sub-reinforcing member through the connecting rib.

[0012] In some examples of the present invention, the crushed stone pile further includes a third connector, which is inserted through the geosynthetic material and connected to the reinforcing member.

[0013] In some examples of the present invention, the immersed tunnel foundation reinforcement structure further includes: a geocell reinforced crushed stone cushion layer, which is disposed above and connected to the gabion layer along the height direction.

[0014] In some examples of the present invention, the immersed tunnel foundation reinforcement structure further includes: a fourth connector and a fifth connector, wherein the fifth connector is disposed within the gabion layer, and the fourth connector passes through the geocell reinforced crushed stone cushion layer and the gabion layer and is connected to the fifth connector, so that the geocell reinforced crushed stone cushion layer is connected to the gabion layer.

[0015] In some examples of the present invention, the immersed tunnel foundation reinforcement structure further includes: an immersed tunnel and a gabion slope protection structure. Along the height direction, the immersed tunnel is located above the geocell reinforced crushed stone cushion layer, and the gabion slope protection structure is located on the corresponding sides of the immersed tunnel.

[0016] The construction method for the foundation reinforcement structure of the immersed tunnel according to the present invention includes: leveling the foundation; driving crushed stone piles into the foundation; setting a gabion layer above the crushed stone piles and connecting the gabion layer to the crushed stone piles; laying a geocell-reinforced crushed stone cushion layer above the gabion layer and connecting the geocell-reinforced crushed stone cushion layer to the gabion layer; setting an immersed tunnel above the geocell-reinforced crushed stone cushion layer; and arranging gabion slope protection structures on both sides of the immersed tunnel.

[0017] The construction method of the immersed tunnel foundation reinforcement structure according to the present invention, by inserting crushed stone piles into the foundation and placing gabion stone cage layers above the crushed stone piles and connecting them with the reinforcing members, can effectively reduce the risk of instability and uneven settlement of the immersed tunnel foundation under strong earthquakes or loads, significantly improve the bearing capacity and stiffness of the immersed tunnel foundation, and help improve the seismic performance and stability of the immersed tunnel foundation.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the immersed tunnel foundation reinforcement structure according to an embodiment of the present invention;

[0021] Figure 2 This is a partial structural schematic diagram of the gabion layer according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the gabion cage body, gabion cage cover, and sliding rod according to an embodiment of the present invention;

[0023] Figure 4 This is a structural schematic diagram of the crushed stone pile and gabion stone cage unit according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the reinforcing member and the third connecting member according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the geocell reinforced crushed stone cushion layer and the gabion stone cage layer according to an embodiment of the present invention.

[0026] Figure label:

[0027] 100mm foundation reinforcement structure for immersed tunnel;

[0028] 1. Foundation; 2. Crushed stone pile; 3. Geosynthetic material; 4. First crushed stone; 5. Reinforcing member; 51. Tie bar connection; 52. First sub-reinforcing member; 53. Second sub-reinforcing member; 54. Connecting bar;

[0029] Gabion layer 6; Gabion unit 61; Second crushed stone 62;

[0030] 71. Gabion cage body; 72. Gabion cage cover; 73. Sliding rod; 74. Filling space; 75. Open end;

[0031] 76. Connecting tie bars; 77. Geocell reinforced crushed stone cushion layer; 78. Pad slab; 79. Immersed tube tunnel; 80. Gabion slope protection structure; 81. Crushed stone backfill layer; 82. Sheet pile wall;

[0032] First connector 91; second connector 92; third connector 93; fourth connector 94; fifth connector 95. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] The following is for reference. Figures 1-6 A foundation reinforcement structure 100 for immersed tunnels according to an embodiment of the present invention is described.

[0035] like Figures 1-6 As shown, the immersed tunnel foundation reinforcement structure 100 according to an embodiment of the present invention includes: a foundation 1, a plurality of crushed stone piles 2, a gabion stone cage layer 6, and a second crushed stone 62.

[0036] The crushed stone pile 2 is installed in the foundation 1. The crushed stone pile 2 includes: geosynthetic material 3, first crushed stone 4, and reinforcing member 5. The geosynthetic material 3 is arranged in a circular manner to form a hollow columnar structure. The first crushed stone 4 is filled inside the surrounding geosynthetic material 3. The reinforcing member 5 is located inside the surrounding geosynthetic material 3. Along the height direction (i.e. Figure 1 (As shown in the Z direction), the gabion layer 6 is located above the crushed stone pile 2 and connected to the reinforcing member 5, and the gabion layer 6 is filled with a second crushed stone 62.

[0037] The number of crushed stone piles 2 is multiple, and the number of crushed stone piles 2 can be, but is not limited to, six or seven. As some embodiments of this application, the number of crushed stone piles 2 is seven, and the seven crushed stone piles 2 are arranged along the first direction (i.e., Figure 1 The crushed stone piles 2 are arranged at intervals along the X-direction shown. They are positioned along the height direction of the immersed tunnel foundation reinforcement structure 100 (i.e.,...). Figure 1The arrangement extends in the Z direction as shown, and the crushed stone pile 2 can be installed in the foundation 1.

[0038] The crushed stone pile 2 includes geosynthetic material 3, first crushed stone 4, and reinforcing member 5. The geosynthetic material 3 can be constructed as, but is not limited to, geogrid, polyester braided sleeve, etc. As some embodiments of this application, the geosynthetic material 3 is constructed as a geogrid. The geosynthetic material 3 can improve the vertical bearing capacity of the immersed tunnel foundation reinforcement structure 100. The geosynthetic material 3 has high tensile strength, low elongation, and along the height direction of the immersed tunnel foundation reinforcement structure 100 (i.e.,... Figure 1 The Z direction shown) and the first direction (i.e. Figure 1 The X-direction shown has high strength.

[0039] Geosynthetic material 3 is arranged in a circular manner to form a hollow columnar structure. The geosynthetic material 3 is filled with first crushed stone 4. A reinforcing member 5 is disposed in the geosynthetic material 3 and connected to the geosynthetic material 3. The connection between the reinforcing member 5 and the geosynthetic material 3 can be, but is not limited to, welding, bolting, etc. As some embodiments of this application, the reinforcing member 5 and the geosynthetic material 3 are connected by bolting.

[0040] The number of reinforcing members 5 can be multiple, including but not limited to two or three. As some embodiments of this application, two reinforcing members 5 are used, with the two reinforcing members 5 arranged along the height direction of the immersed tunnel foundation reinforcement structure 100 (i.e.,...). Figure 1 The interval settings are shown in the Z direction.

[0041] Along the height direction of the immersed tunnel foundation reinforcement structure 100 (i.e. Figure 1 (As shown in the Z direction), the gabion layer 6 is positioned above the crushed stone pile 2, and the gabion layer 6 is connected to the reinforcing member 5. In some embodiments of this application, the gabion layer 6 and the reinforcing member 5 are connected by connecting tie rods 76 or other components. The connection between the gabion layer 6 and the reinforcing member 5 enables the gabion layer 6 and the crushed stone pile 2 to form a cooperative load-bearing structure, thereby improving overall stability. The gabion layer 6 is filled with a second type of crushed stone 62.

[0042] It should be noted that the crushed stone piles 2 can effectively reduce the occurrence of liquefaction in weak soil layers, and the gabion layer 6 can effectively slow down the propagation of seismic waves. This arrangement can reduce the pressure and stress fluctuations of pore water generated by earthquakes, significantly improve the seismic resistance of the immersed tunnel foundation reinforcement structure 100 under seismic action, and through the synergistic effect of the crushed stone piles 2 and the gabion layer 6, the settlement and differential deformation of the immersed tunnel foundation reinforcement structure 100 can be effectively controlled, thereby improving the stability of the immersed tunnel foundation reinforcement structure 100.

[0043] Moreover, the immersed tunnel foundation reinforcement structure 100 of this application has low construction cost, simple construction process, and high construction efficiency. It can significantly reduce the difficulty of pile top heave and foundation leveling that may occur during construction. It can also adapt to different soil conditions (it can be applied to soft liquefiable soil layers on the seabed or riverbed), and can significantly improve the adaptability and reliability of the immersed tunnel foundation reinforcement structure 100.

[0044] Therefore, by having the crushed stone piles 2 penetrate the foundation 1 and the gabion stone cage layer 6 placed above the crushed stone piles 2 and connected to the reinforcing member 5, the risk of instability and uneven settlement of the foundation 1 of the immersed tunnel 79 under strong earthquakes or loads can be reduced, significantly improving the bearing capacity and stiffness of the immersed tunnel foundation reinforcement structure 100, which is beneficial to improving the seismic performance and stability of the immersed tunnel foundation reinforcement structure 100.

[0045] In some embodiments of the present invention, such as Figures 2-6 As shown, the gabion layer 6 includes: multiple gabion units 61 and multiple first connectors 91. Two adjacent gabion units 61 are connected by the first connectors 91, and the gabion unit 61 is filled with second crushed stone 62.

[0046] The number of gabion stone cage units 61 is multiple, and the number of gabion stone cage units 61 can be, but is not limited to, six or seven. As some embodiments of this application, the number of gabion stone cage units 61 is seven, and the seven gabion stone cage units 61 are arranged along the first direction (i.e., Figure 1 The X-direction (as shown) is arranged at intervals.

[0047] There are multiple first connectors 91, and two adjacent gabion cage units 61 are connected by the first connectors 91. As some embodiments of this application, there are seven gabion cage units 61, and the seven gabion cage units 61 are arranged along a first direction (i.e., Figure 1 The first connectors 91 are arranged at intervals along the X direction (as shown), and there are six first connectors 91 in total. The six first connectors 91 are arranged along the first direction (i.e., Figure 1 The gabion units 61 are arranged at intervals in the X direction shown, and two adjacent gabion units 61 are connected by the first connector 91.

[0048] The gabion unit 61 is filled with second crushed stone 62. As some embodiments of this application, there are seven gabion units 61, and all seven gabion units 61 are filled with second crushed stone 62.

[0049] The first connector 91 can be connected to the gabion unit 61 by means of welding, bolting, etc. As some embodiments of this application, the first connector 91 is connected to the gabion unit 61 by welding.

[0050] This design can improve the overall structural strength of the gabion layer 6, improve the horizontal tensile stress distribution of the gabion layer 6, and help improve the seismic performance and stability of the immersed tunnel foundation reinforcement structure 100.

[0051] In some embodiments of the present invention, such as Figure 3 As shown, the gabion unit 61 includes: a gabion body 71, a gabion cover 72, and a sliding rod 73. The gabion body 71 defines a filling space 74 with one end open. The filling space 74 is filled with second gravel 62. The gabion cover 72 is movably disposed on the gabion body 71 and can cover the open end 75 of the filling space 74. The sliding rod 73 is slidably disposed on the gabion body 71 and can support the gabion cover 72 so that the filling space 74 is open.

[0052] Among them, the gabion body 71 can define the filling space 74 along the height direction of the immersed tunnel foundation reinforcement structure 100 (i.e., Figure 1 (As shown in the Z direction), the filling space 74 has one end close to the crushed stone pile 2 and one end away from the crushed stone pile 2. The end of the filling space 74 away from the crushed stone pile 2 is open to form an open end 75.

[0053] The filling space 74 is filled with a second type of crushed stone 62. The gabion cover 72 is movably disposed on the gabion body 71. The gabion cover 72 and the gabion body 71 can be movably connected in a way that is not limited to, but can be rotatably connected. As some embodiments of this application, the gabion cover 72 has a pivot shaft, and the gabion body 71 has a pivot hole. The pivot shaft and the pivot hole cooperate with each other to make the gabion cover 72 and the gabion body 71 rotatably connected.

[0054] The gabion cage cover 72 can cover the open end 75 of the filling space 74. The slide rod 73 is slidably disposed on the gabion cage body 71 and can support the gabion cage cover 72. The slide rod 73 can be constructed as, but is not limited to, a threaded slide rod 73, a hinged slide rod 73, etc. As some embodiments of this application, the slide rod 73 is constructed as a hinged slide rod 73. As some embodiments of this application, a slide rail is formed on the gabion cage body 71. One end of the slide rod 73 is hinged to the gabion cage cover 72, and the other end of the slide rod 73 is connected to a slider. The slider is slidably disposed on the slide rail. By sliding the slider, the slide rod 73 can slide on the slide rail of the gabion cage body 71 to adjust the gabion cage cover 72 to open or cover the open end 75 of the filling space 74.

[0055] This configuration allows for precise control of the opening and closing of the gabion cage cover 72 via the slide bar 73, facilitating the filling of the second crushed stone 62 and improving the crushed stone filling efficiency of the gabion cage unit 61.

[0056] In some embodiments of the present invention, such as Figure 4 As shown, the immersed tunnel foundation reinforcement structure 100 also includes a connecting tie bar 76, which is connected between the reinforcing member 5 and the gabion layer 6.

[0057] The connecting tie 76 can be constructed as, but is not limited to, a high-strength threaded steel bar tie, a carbon fiber-steel composite tie, etc. As some embodiments of this application, the connecting tie 76 is constructed as a high-strength threaded steel bar tie.

[0058] The connecting tie rod 76 connects the reinforcing member 5 and the gabion layer 6. That is, the connecting tie rod 76 has two opposing ends, one end connected to the reinforcing member 5 and the other end connected to the gabion layer 6. The connection method between the connecting tie rod 76 and the reinforcing member 5 can be, but is not limited to, welding or snap-fitting. As some embodiments of this application, the connecting tie rod 76 and the reinforcing member 5 are connected by welding. The connection method between the connecting tie rod 76 and the gabion layer 6 can be, but is not limited to, welding or snap-fitting. As some embodiments of this application, the connecting tie rod 76 and the gabion layer 6 are connected by welding.

[0059] This arrangement can improve the integrity of the crushed stone piles 2 and the gabion stone cage layer 6, improve the stability of the immersed tunnel foundation reinforcement structure 100, and significantly reduce the risk of shear slippage of the immersed tunnel foundation reinforcement structure 100 under seismic action.

[0060] In some embodiments of the present invention, such as Figure 5 As shown, the reinforcing member 5 has a tie rod connection port 51, and the gabion layer 6 also includes a second connector 92, with a connecting tie rod 76 passing through the tie rod connection port 51 to connect with the reinforcing member 5, and the connecting tie rod 76 is connected to the second connector 92.

[0061] The reinforcing member 5 has a tie rod connection port 51. The number of tie rod connection ports 51 is multiple, and the number of tie rod connection ports 51 can be, but is not limited to, six or eight. As some embodiments of this application, the number of tie rod connection ports 51 is eight, and the eight tie rod connection ports 51 are arranged around the reinforcing member 5.

[0062] The connecting tie 76 is inserted through the tie connection port 51 to connect with the reinforcing member 5. The connection method between the connecting tie 76 and the reinforcing member 5 can be, but is not limited to, welding, snap-fitting, etc. As some embodiments of this application, the connecting tie 76 is inserted through the tie connection port 51 to connect with the reinforcing member 5 by snap-fitting. As some embodiments of this application, the connecting tie 76 is inserted through the tie connection port 51 and connected with the reinforcing member 5 by welding.

[0063] The connecting tie 76 is connected to the second connector 92. In some embodiments of this application, the connecting tie 76 and the second connector 92 are connected by welding. In some embodiments of this application, the second connector 92 is constructed as a hook-shaped structure, and the connecting tie 76 can be sleeved on the second connector 92 to connect with the second connector 92.

[0064] This configuration enables the connecting tie rod 76 to stably connect the reinforcing member 5 and the gabion layer 6, improves the integrity of the crushed stone pile 2 and the gabion layer 6, enhances the seismic performance of the immersed tunnel foundation reinforcement structure 100, and significantly reduces the risk of shear slippage of the immersed tunnel foundation reinforcement structure 100 under seismic action.

[0065] In some embodiments of the present invention, such as Figure 5 As shown, the reinforcing member 5 includes: a first sub-reinforcing member 52, a second sub-reinforcing member 53, and a connecting rib 54. Both the first sub-reinforcing member 52 and the second sub-reinforcing member 53 are constructed as ring-shaped members. The first sub-reinforcing member 52 is sleeved on the outside of the second sub-reinforcing member 53 and is connected to the second sub-reinforcing member 53 through the connecting rib 54.

[0066] The first sub-reinforcing member 52 and the second sub-reinforcing member 53 are both constructed as ring-shaped members, and the inner diameter of the first sub-reinforcing member 52 is larger than the outer diameter of the second sub-reinforcing member 53. The first sub-reinforcing member 52 and the second sub-reinforcing member 53 are connected and arranged. Specifically, the first sub-reinforcing member 52 is sleeved on the outside of the second sub-reinforcing member 53, and the first sub-reinforcing member 52 is connected to the second sub-reinforcing member 53 through a connecting rib 54.

[0067] As some embodiments of this application, such as Figure 5 As shown, the connecting rib 54 is constructed in a cross shape. The annular center of the first sub-reinforcing member 52 and the second sub-reinforcing member 53 coincides with the cross shape center of the connecting rib 54, so that the first sub-reinforcing member 52 is connected to the second sub-reinforcing member 53 through the connecting rib 54.

[0068] As some embodiments of this application, a plurality of connecting ribs 54 are connected between the first sub-reinforcing member 52 and the second sub-reinforcing member 53, and the plurality of connecting ribs 54 are arranged in a surrounding manner.

[0069] As some embodiments of this application, the tie rod connection 51 is formed on the first sub-reinforcing member 52. As some embodiments of this application, the number of tie rod connection 51 is eight, and the eight tie rod connection 51 are arranged around the first sub-reinforcing member 52.

[0070] This configuration enables the reinforcing member 5 to have good strength and stiffness, improves the circumferential stiffness of the crushed stone pile 2, and is beneficial to improving the structural strength of the immersed tunnel foundation reinforcement structure 100.

[0071] In some embodiments of the present invention, such as Figure 5 As shown, the crushed stone pile 2 also includes a third connector 93, which is inserted through the geosynthetic material 3 and connected to the reinforcing member 5.

[0072] The third connector 93 can be, but is not limited to, a screw or bolt. In some embodiments of this application, the third connector 93 is constructed as a screw. The third connector 93 can pass through the geosynthetic material 3 and connect to the reinforcing member 5; that is, the third connector 93 passes through the geosynthetic material 3 and is connected to the reinforcing member 5. The connection between the third connector 93 and the reinforcing member 5 can be, but is not limited to, welding or bolting. In some embodiments of this application, the connecting rib 54 of the reinforcing member 5 has a connecting hole, which is a threaded hole. The third connector 93 is constructed as a screw, and the third connector 93 can pass through the geosynthetic material 3 and threadedly engage with the connecting hole to connect to the reinforcing member 5.

[0073] By having the third connector 93 pass through the geosynthetic material 3 and connect with the reinforcing member 5, the stability of the connection between the reinforcing member 5 and the geosynthetic material 3 can be improved, thereby improving the overall structural strength of the crushed stone pile 2 and improving the stability of the immersed tunnel foundation reinforcement structure 100.

[0074] In some embodiments of the present invention, such as Figure 1 and Figure 6 As shown, the immersed tunnel foundation reinforcement structure 100 also includes: a geocell-reinforced crushed stone cushion layer 77, along the height direction (i.e., Figure 1 (As shown in the Z direction), the geocell reinforced crushed stone cushion layer 77 is located above the gabion layer 6 and connected to the gabion layer 6.

[0075] Among them, along the height direction of the immersed tunnel foundation reinforcement structure 100 (i.e. Figure 1 (As shown in the Z direction), the geocell reinforced crushed stone cushion layer 77 is disposed above the gabion layer 6, and the geocell reinforced crushed stone cushion layer 77 is connected to the gabion layer 6. The geocell reinforced crushed stone cushion layer 77 and the gabion layer 6 can be connected by, but are not limited to, welding, bolting, etc. As some embodiments of this application, the geocell reinforced crushed stone cushion layer 77 and the gabion layer 6 are connected by bolting.

[0076] This arrangement enables the geocell reinforced crushed stone cushion layer 77 and the gabion stone cage layer 6 to form an integral load-bearing structure, which can improve the stability and seismic performance of the immersed tunnel foundation reinforcement structure 100.

[0077] In some embodiments of the present invention, such as Figure 6As shown, the immersed tunnel foundation reinforcement structure 100 also includes: a fourth connector 94 and a fifth connector 95. The fifth connector 95 is located inside the gabion layer 6, and the fourth connector 94 passes through the geocell reinforced crushed stone cushion layer 77 and the gabion layer 6 and is connected to the fifth connector 95, so that the geocell reinforced crushed stone cushion layer 77 is connected to the gabion layer 6.

[0078] The fifth connector 95 is disposed within the gabion layer 6. As some embodiments of this application, the fifth connector 95 is fixed within the gabion layer 6 and is connected to the gabion layer 6 by welding.

[0079] The fourth connector 94 can be inserted into the geocell reinforced crushed stone cushion layer 77 and the gabion layer 6, and the fourth connector 94 is connected to the fifth connector 95. As some embodiments of this application, the geocell reinforced crushed stone cushion layer 77 and the gabion layer 6 both have corresponding through holes. The fourth connector 94 can be inserted into the corresponding through holes of the geocell reinforced crushed stone cushion layer 77 and the gabion layer 6 in sequence and connected to the fifth connector 95.

[0080] The connection method between the fourth connector 94 and the fifth connector 95 can be, but is not limited to, welding, bolt connection, etc. As some embodiments of this application, the fourth connector 94 is constructed as a bolt, and the fifth connector 95 is constructed as a sleeve. The fourth connector 94 can be inserted into the geocell reinforced crushed stone cushion layer 77 and the gabion stone cage layer 6 to be threadedly connected to the fifth connector 95.

[0081] The number of fourth connectors 94 can be multiple, including but not limited to three or four. As some embodiments of this application, the number of fourth connectors 94 is three, with the three fourth connectors 94 arranged along the first direction (i.e.,...). Figure 1 The fifth connector and the fourth connector 94 are arranged at intervals (as shown in the X direction). The fifth connector and the fourth connector 94 are the same in number and are arranged in a one-to-one correspondence.

[0082] As some embodiments of this application, such as Figure 6 As shown, the immersed tunnel foundation reinforcement structure 100 also includes a pad 78, which extends along the height direction of the immersed tunnel foundation reinforcement structure 100 (i.e., Figure 1 (As shown in the Z direction), the pad 78 is placed on the geocell reinforced crushed stone cushion layer 77. It should be noted that the fourth connector 94, the fifth connector 95, and the pad 78 are all set one-to-one.

[0083] As some embodiments of this application, such as Figure 6 As shown, the pad 78 is constructed of steel, the fourth connector 94 is constructed of bolts, and the fifth connector 95 is constructed of a sleeve, along the height direction of the immersed tunnel foundation reinforcement structure 100 (i.e., Figure 1(As shown in the Z direction), the fourth connector 94 can be sequentially inserted through the pad 78, the geocell reinforced crushed stone pad 77, and the gabion layer 6, and then bolted to the fifth connector 95 so that the geocell reinforced crushed stone pad 77 is connected to the gabion layer 6.

[0084] This configuration can improve the stability of the connection between the geocell reinforced crushed stone cushion layer 77 and the gabion stone cage layer 6, and can improve the stability and seismic performance of the immersed tunnel foundation reinforcement structure 100.

[0085] In some embodiments of the present invention, such as Figure 1 As shown, the immersed tunnel foundation reinforcement structure 100 also includes: the immersed tunnel 79, and the gabion slope protection structure 80, along the height direction (i.e., Figure 1 (As shown in the Z direction), the immersed tunnel 79 is located above the geocell reinforced crushed stone cushion layer 77, and the gabion slope protection structure 80 is located on the corresponding two sides of the immersed tunnel 79.

[0086] Among them, along the height direction (i.e. Figure 1 The immersed tunnel 79 is located above the geocell reinforced crushed stone cushion layer 77, along the first direction (i.e., the Z direction shown). Figure 1 (As shown in the X direction), the immersed tunnel 79 has opposite sides, and the gabion slope protection structure 80 is located on opposite sides of the immersed tunnel 79.

[0087] This setup allows the gabion slope protection structure 80 to lock the immersed tunnel 79, which helps improve the scour resistance of the immersed tunnel 79.

[0088] As some embodiments of this application, such as Figure 1 As shown, the immersed tunnel foundation reinforcement structure 100 also includes: a crushed stone backfill layer 81 and a sheet pile wall 82. The crushed stone backfill layer 81 is laid on the immersed tunnel 79 and the gabion slope protection structure 80, and the sheet pile wall 82 is located on both sides of the immersed tunnel 79.

[0089] The construction method for the foundation reinforcement structure of the immersed tunnel according to an embodiment of the present invention includes the following steps:

[0090] S1, Level the foundation;

[0091] As some embodiments of this application, during the construction of the foundation reinforcement structure for immersed tunnels, the foundation is first leveled, and then holes are drilled at the designed locations.

[0092] S2, drive the crushed stone piles into the foundation;

[0093] In some embodiments of this application, first crushed stone is filled into the hole, and simultaneously wrapped with geosynthetic material and compacted in layers to allow the crushed stone pile to be installed in the foundation. In some embodiments of this application, a third connector can be inserted through the geosynthetic material and connected to the reinforcing member.

[0094] S3, A gabion layer is set above the crushed stone pile, and the gabion layer is connected to the crushed stone pile;

[0095] As some embodiments of this application, reinforcement members are installed at a specific height of the crushed stone pile, and then each gabion stone cage unit is connected by a first connector to form a gabion stone cage layer, and filled with second crushed stone. As some embodiments of this application, the gabion stone cage layer can be connected to the reinforcement members on the crushed stone pile by the second connector to form a cooperative stress-bearing structure.

[0096] S4, a geocell reinforced crushed stone cushion layer is laid on top of the gabion layer, and the geocell reinforced crushed stone cushion layer is connected to the gabion layer.

[0097] As some embodiments of this application, when laying a geocell reinforced crushed stone cushion layer on a gabion layer, mechanical equipment can be used to spread and compact it in layers.

[0098] S5, a immersed tunnel is set up above the geocell reinforced crushed stone cushion layer;

[0099] As some embodiments of this application, immersed tunnels can be placed on the surface of a leveled geocell reinforced crushed stone cushion layer.

[0100] S6, gabion slope protection structures are arranged on both sides of the immersed tunnel.

[0101] As some embodiments of this application, gabion slope protection structures can be arranged on both sides of the immersed tunnel, and a crushed stone backfill layer can be laid on the top of the immersed tunnel and the top of the gabion slope protection structure to coordinate settlement and deformation and improve the drainage and liquefaction resistance of the immersed tunnel foundation reinforcement structure.

[0102] As some embodiments of this application, during the construction of the foundation reinforcement structure for immersed tunnels, the foundation is first leveled. Then, holes are drilled at the designed locations, and the first type of crushed stone is filled into the holes. Simultaneously, the first type of crushed stone is wrapped with geosynthetic material and compacted in layers. Reinforcing members are installed at specific heights of the crushed stone piles. Next, the gabion stone cage units are connected by first connectors to form a gabion stone cage layer, which is then filled with second type of crushed stone. Then, a third connector is inserted through the geosynthetic material and connected to the reinforcing members. Finally, the gabion stone... A geocell-reinforced crushed stone cushion layer is laid on the gabion layer, and mechanical equipment is used to spread and compact it in layers. Then, the gabion layer is connected to the reinforcing members on the crushed stone piles through the second connector to form a synergistic load-bearing structure. Next, the immersed tunnel is placed on the leveled geocell-reinforced crushed stone cushion layer. Gabion slope protection structures are arranged on both sides of the immersed tunnel. Crushed stone backfill layer is laid on the top of the immersed tunnel and the top of the gabion slope protection structure to coordinate settlement and deformation and improve the drainage and liquefaction resistance of the immersed tunnel foundation reinforcement structure.

[0103] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0104] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0105] In the description of this invention, "a plurality of" means two or more.

[0106] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0107] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0109] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A structure for ground reinforcement of a immersed tunnel, characterized in that, Comprise: a foundation, a plurality of rubble piles, the rubble piles being arranged in the foundation, the rubble piles comprising: a geosynthetic material, a first rubble, a reinforcing member, the geosynthetic material being arranged around to form a hollow columnar structure, the first rubble being filled in the geosynthetic material arranged around, the reinforcing member being arranged in the geosynthetic material arranged around; a gabion layer, a second rubble, along a height direction, the gabion layer being arranged above the rubble piles and connected with the reinforcing member, the gabion layer being filled with the second rubble.

2. The immersed tunnel ground reinforcement structure according to claim 1, characterized in that, The gabion layer comprises: a plurality of gabion units, a plurality of first connecting members, two adjacent gabion units being connected by the first connecting members, the gabion units being filled with the second rubble.

3. The immersed tunnel ground reinforcement structure according to claim 2, wherein The gabion unit comprises: a gabion main body, a gabion cover, a sliding rod, the gabion main body defining a filling space with an open end, the filling space being filled with the second rubble, the gabion cover being movably arranged on the gabion main body and capable of covering the open end of the filling space, the sliding rod being slidably arranged on the gabion main body and capable of supporting the gabion cover to make the filling space open.

4. The immersed tunnel foundation reinforcement structure according to claim 1, wherein Further comprise: a connecting bar, the connecting bar being connected between the reinforcing member and the gabion layer.

5. The immersed tunnel ground reinforcement structure according to claim 4, wherein The reinforcing member is formed with a bar connecting port, the gabion layer further comprises: a second connecting member, the connecting bar being arranged in the bar connecting port to be connected with the reinforcing member, and the connecting bar being connected with the second connecting member.

6. The immersed tunnel foundation reinforcing structure according to claim 1, wherein The reinforcing member comprises: a first sub-reinforcing member, a second sub-reinforcing member, a connecting rod, the first sub-reinforcing member and the second sub-reinforcing member are both configured as ring members, the first sub-reinforcing member is sleeved outside the second sub-reinforcing member and connected with the second sub-reinforcing member through the connecting rod.

7. The immersed tunnel foundation reinforcing structure according to claim 1, wherein The rubble pile further comprises: a third connecting member, the third connecting member being arranged in the geosynthetic material and connected with the reinforcing member.

8. The immersed tunnel foundation reinforcing structure according to claim 1, wherein Further comprise: a geocell reinforced gravel cushion layer, along the height direction, the geocell reinforced gravel cushion layer being arranged above the gabion layer and connected with the gabion layer.

9. The immersed tunnel foundation reinforcement structure according to claim 8, wherein, Further comprise: a fourth connecting member, a fifth connecting member, the fifth connecting member being arranged in the gabion layer, the fourth connecting member being arranged in the geocell reinforced gravel cushion layer and the gabion layer and connected with the fifth connecting member, so that the geocell reinforced gravel cushion layer is connected with the gabion layer.

10. The immersed tunnel foundation reinforcement structure according to claim 8, wherein, Further comprise: a immersed tunnel, a gabion slope protection structure, along the height direction, the immersed tunnel being arranged above the geocell reinforced gravel cushion layer, the gabion slope protection structure being arranged on two sides corresponding to the immersed tunnel.

11. A method of construction of a ground reinforcement structure for a immersed tunnel, characterized in that, Comprise: a leveled foundation; arranging rubble piles in the foundation; arranging a gabion layer above the rubble piles and connecting the gabion layer with the rubble piles; laying a geocell reinforced gravel cushion layer above the gabion layer and connecting the geocell reinforced gravel cushion layer with the gabion layer; arranging an immersed tunnel above the geocell reinforced gravel cushion layer; Gabbion retaining structure is arranged on both sides of the immersed tunnel.

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