Large and small arch combined stress-induced drainage shipping slope supporting structure

Abstract

The invention discloses a large and small arch combined stress-induced drainage shipping slope supporting structure, and belongs to the technical field of channel supporting, the large and small arch combined stress-induced drainage shipping slope supporting structure comprises a combined arch structure, the combined arch structure comprises a top arch and a plurality of groups of bottom arches connected with the top arch, and the bottom arches are all arranged on the back of the top arch; the bottom arch comprises rigid piles and a first flexible pile group, the first flexible pile group comprises a plurality of first flexible pile single bodies, the first flexible pile single bodies are tightly connected along the same arch axis, and the rigid piles are arranged at arch feet on the two sides of the bottom arch and tightly connected with the first flexible pile group. A drainage pipe is arranged on one side of the rigid pile and is obliquely arranged relative to the horizontal plane. By the adoption of the structure, under the condition that drainage is not dependent on external power, the drainage potential of a soil stress concentration area can be fully utilized, and cooperative improvement of stress induced drainage and slope stability is achieved.

Description

Technical Field

[0001] This invention relates to the field of waterway support technology, and in particular to a combined large and small arch stress-induced drainage waterway slope support structure. Background Technology

[0002] In shipping engineering, river regulation, and port construction, slope stability is a crucial foundation for ensuring waterway safety and the long-term operation of the project. Influenced by factors such as periodic water level changes, ship loads, seepage, and the weight of the soil, high pore water pressure can easily form within shipping slopes, leading to a reduction in effective soil stress and shear strength, thereby inducing slope slippage, deformation, and even instability.

[0003] In existing shipping slope protection projects, techniques such as gravity retaining walls, pile-slab structures, anchor cable reinforcement, composite foundation treatment, or forced drainage systems are commonly used to improve slope anti-sliding stability. These techniques largely rely on increasing structural stiffness or installing external drainage facilities to improve slope stability. While they can control deformation to some extent, they generally suffer from problems such as large material consumption, complex construction, high project costs, and insufficient adaptability to foundation conditions.

[0004] On the other hand, existing drainage measures are mostly based on "passive drainage" or "externally powered drainage," and their drainage efficiency is easily affected by construction quality, maintenance conditions, and operating environment, making it difficult to continuously and effectively dissipate pore water pressure within the soil during the long-term service of the slope. At the same time, some support structures are mainly rigidly constrained, ignoring the stress redistribution characteristics of the soil under its own weight and lateral earth pressure, and failing to fully utilize the promoting effect of the soil's own stress conditions on pore water migration and discharge.

[0005] In addition, in existing shipping slope reinforcement projects using pile groups, the piles are mostly arranged in a regular or uniform manner, and the stress transfer path between the piles is singular, making it difficult to form a stable and continuous arch effect stress system. This leads to stress concentration and insufficient drainage, and the improvement of slope stability still depends on increasing the pile diameter, reducing the pile spacing, or superimposing other reinforcement measures, which further increases the project cost. Summary of the Invention

[0006] The purpose of this invention is to provide a combined large and small arch stress-induced drainage navigation slope support structure to solve the technical problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides a combined large and small arch stress-induced drainage navigation slope support structure, comprising a combined arch structure, wherein the combined arch structure includes a top arch and a bottom arch connected to the top arch, and multiple sets of bottom arches are provided, all located on the back of the top arch. The bottom arch includes rigid piles and a first flexible pile group, wherein the first flexible pile group includes multiple first flexible pile units, and the multiple first flexible pile units are closely connected along the same arch axis. The rigid piles are located at the arch feet on both sides of the bottom arch and are closely connected to the first flexible pile group. A drainage pipe is provided on one side of the rigid pile, and the drainage pipe is inclined relative to the horizontal plane.

[0008] Preferably, the arch includes a second flexible pile group, which includes multiple second flexible pile units, and the multiple second flexible pile units are closely connected along the same arch axis.

[0009] Preferably, the system also includes a third flexible pile group and a fourth flexible pile group. The fourth flexible pile group is arranged on both sides of the third flexible pile group and is closely connected to the third flexible pile group. The third flexible pile group is arranged along the direction of the waterway, and the fourth flexible pile group is arranged along the direction perpendicular to the waterway.

[0010] Preferably, the third flexible pile group is provided in multiple groups, each group is closely connected to the other, and each group includes multiple closely connected third flexible pile units along the same axis. The fourth flexible pile group is also provided in multiple groups, each group is closely connected to the others, and each group includes multiple closely connected fourth flexible pile units along the same axis.

[0011] Preferably, the first flexible pile unit, the second flexible pile unit, the third flexible pile unit, and the fourth flexible pile unit are all cement piles.

[0012] Preferably, the rigid pile at the arch foot of the top arch is connected to the fourth flexible pile group.

[0013] Preferably, the curvature of the top arch is in the range of 70-120°, and the curvature of the bottom arch is in the range of 50-80°.

[0014] Preferably, the curvature of the top arch is greater than the curvature of the bottom arch.

[0015] Therefore, the present invention employs the above-mentioned combined large and small arch stress-induced drainage navigation slope support structure, which has the following beneficial effects: (1) The support structure of the present invention forms a synergistic force relationship between rigid piles and flexible piles under the action of soil self-weight and lateral earth pressure, constructs a stable arch effect stress transmission path, thereby inducing and strengthening the discharge of pore water inside the slope, reducing pore water pressure, increasing soil effective stress and shear strength, and thus improving the overall anti-sliding stability of the navigation slope. (2) Under the premise of meeting the requirements of slope safety and stability, the present invention can reduce the reliance on high-strength reinforcement measures and external drainage systems, and achieve a synergistic improvement in structural safety, economy and adaptability.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a top view of the support structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram showing the location of the drain pipe according to an embodiment of the present invention; Figure Labels 1. Top arch; 11. Second flexible pile unit; 2. Bottom arch; 21. First flexible pile unit; 22. Rigid pile; 3. Third flexible pile unit; 4. Fourth flexible pile unit; 5. Drainage pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product of the invention is in use. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to 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 the present invention.

[0019] Example like Figure 1 and Figure 2As shown, this invention provides a combined large and small arch stress-induced drainage navigation slope support structure, including a combined arch structure. The combined arch structure includes a top arch 1 and a bottom arch 2 connected to the top arch 1. Multiple sets of bottom arches 2 are provided, all located on the arch back of the top arch 1. The bottom arch 2 includes rigid piles 22 and a first flexible pile group. The first flexible pile group includes multiple first flexible pile units 21, which are closely connected along the same arch axis. The rigid piles 22 are located at the arch feet on both sides of the bottom arch 2 and are closely connected to the first flexible pile group. A drainage pipe 5 is provided on one side of the rigid pile 22, and the drainage pipe 5 is inclined relative to the horizontal plane to coordinate the drainage direction with the direction of water migration in the soil. The rigid piles 22 serve as load-bearing and force-transmitting components, used to bear and transmit large concentrated stresses, while the first flexible pile group is used to achieve stress redistribution and deformation coordination.

[0020] Under the action of the slope soil's self-weight and lateral earth pressure, an arch effect stress path is formed inside the bottom arch 2. The soil stress is transmitted along the arch axis and concentrates at the arch foot of the bottom arch 2, i.e., at the rigid pile 22. Since the rigid pile 22 is the key area for the transmission of axial pressure from the arch to the supporting structure, the earth pressure it bears is significantly higher than that in the arch crown and arch belly areas, thus forming a higher pore water pressure in this area.

[0021] By installing drainage pipes 5 at the rigid piles 22, a stable drainage driving force can be formed under the action of the soil's own stress, causing pore water to be discharged more rapidly along the direction of drainage pipes 5, thus achieving continuous dissipation of pore water pressure. As the pore water pressure decreases, the effective stress of the arch foot and the surrounding soil is increased, and the shear strength of the soil is enhanced, thereby improving the overall anti-sliding stability of the navigation slope.

[0022] In this embodiment, the top arch 1 includes a second flexible pile group, which includes multiple second flexible pile units 11, and the multiple second flexible pile units 11 are closely connected along the same arch axis.

[0023] In this embodiment, the support structure also includes a third flexible pile group and a fourth flexible pile group. The fourth flexible pile group is arranged on both sides of the third flexible pile group and is closely connected to the third flexible pile group. The third flexible pile group is arranged along the direction of the waterway, and the fourth flexible pile group is arranged along the direction perpendicular to the waterway.

[0024] In this embodiment, the third flexible pile group is provided in multiple groups, each group is closely connected to the other, and each group includes multiple closely connected third flexible pile units 3 along the same axis. In this embodiment, the fourth flexible pile group is also provided in multiple groups, each group is closely connected to each other, and each group includes multiple closely connected fourth flexible pile units 4 along the same axis.

[0025] In this embodiment, the first flexible pile unit 21, the second flexible pile unit 11, the third flexible pile unit 3, and the fourth flexible pile unit 4 are all cement piles.

[0026] In this embodiment, the rigid pile 22 at the arch foot of the top arch 1 is connected to the fourth flexible pile group.

[0027] In this embodiment, the arc range of the top arch 1 is 70-120°, and the arc range of the bottom arch 2 is 50-80°.

[0028] The technical principle of the support structure of this invention is as follows: In the composite arch structure of this invention, the top arch 1 and the bottom arch 2 form a continuous stress boundary, and the stress is transmitted from the top of the arch to the bottom of the arch along the arch axis. The soil is subjected to stress under its own weight. and lateral earth pressure The stress is transmitted from the arch crown to the arch foot along the arch axis, where, This is the lateral pressure coefficient. Indicates the burial depth of the calculation point. This indicates the natural density of the soil.

[0029] In the bottom arch 2 structure, under the action of earth pressure, it can be approximated as a compression arch structure subjected to uniformly distributed load. Its interior is dominated by axial pressure, and the axial pressure at any section inside the arch is expressed as: ; In the formula, For the axial pressure, The bending moment at this section is... The height of the arch arrow.

[0030] In the top arch 1 structure, the bending moment at the arch crown is relatively large, but the axial force is relatively small. The rigid pile 22 not only bears the axial pressure but also the horizontal thrust generated by the lateral pressure of the soil. The resultant force at the arch foot is expressed as: ; In the formula, This refers to the axial pressure on the arch. The horizontal thrust of the arch, This indicates the pressure exerted on a rigid pile.

[0031] Based on the aforementioned stress distribution characteristics, rigid piles 22 are used at the arch foot of the bottom arch to effectively withstand concentrated axial pressure and horizontal thrust; flexible piles are used in the remaining parts to allow for a certain degree of deformation to achieve stress adjustment and diffusion. This design helps to avoid stress abrupt changes caused by a fully rigid structure; improves the stability of the arch effect; and reduces material usage and engineering costs.

[0032] According to Terzaghi's effective stress principle, the relationship between effective stress and pore water pressure is as follows: ; In the formula, For effective stress, For the total stress, This represents the pore water pressure. In the stress concentration zone of a rigid pile, the total stress is... The soil porosity tends to compress significantly, and if drainage conditions are insufficient, then... As the effective stress increases, the increase in effective stress becomes limited.

[0033] When a drainage pipe 5 is installed at the rigid pile 22, high total stress leads to high pore water pressure. The drainage pipe 5 acts as a low water head boundary, forming a stable hydraulic gradient within the soil. ; According to Darcy's Law: ; In the formula, For seepage flow, The soil permeability coefficient, The effective seepage area.

[0034] Because the stress at the rigid piles is present for a long time, the drainage process is continuous and self-driven, and pore water can be discharged without the need for external power.

[0035] As pore water pressure decreases, effective stress... The soil shear strength increases according to the Mohr-Coulomb criterion, as shown in the formula: ; In the formula, For effective cohesion, This is the effective internal friction angle.

[0036] Due to the increased shear strength, the anti-sliding force of the waterway slope increases, the safety factor improves, and the reliance on external reinforcement and drainage measures decreases.

[0037] Therefore, the present invention adopts the above-mentioned combined large and small arch stress-induced drainage navigation slope support structure, which can make full use of the drainage potential of the stress concentration area of ​​the soil without relying on external power drainage, and achieve synergistic improvement of stress-induced drainage and slope stability.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A size arch combination stress induced drainage shipping slope support structure, characterized in that: The combined arch structure comprises a top arch and a bottom arch connected with the top arch, the bottom arch is provided with a plurality of groups, each of which is arranged on the back of the top arch, the bottom arch comprises a rigid pile and a first flexible pile group, the first flexible pile group comprises a plurality of first flexible pile monomers, and the plurality of first flexible pile monomers are closely connected along the same arch axis, the rigid pile is arranged at the arch foot of the bottom arch and is closely connected with the first flexible pile group, and the rigid pile is provided with a drain pipe on one side, and the drain pipe is arranged inclined to the horizontal plane.

2. A size arch combination stress induced drainage shipping slope support structure according to claim 1, characterized in that: The top arch comprises a second flexible pile group, the second flexible pile group comprises a plurality of second flexible pile monomers, and the plurality of second flexible pile monomers are closely connected along the same arch axis.

3. A size arch combination stress induced drainage shipping slope support structure according to claim 2, characterized in that: It also comprises a third flexible pile group and a fourth flexible pile group, the fourth flexible pile group is arranged on both sides of the third flexible pile group and is closely connected with the third flexible pile group, the third flexible pile group is arranged along the channel direction, and the fourth flexible pile group is arranged along the direction perpendicular to the channel.

4. A size arch combination stress induced drainage shipping slope support structure according to claim 3, characterized in that: The third flexible pile group is provided with a plurality of groups, each of which is closely connected, and each group comprises a plurality of third flexible pile monomers closely connected along the same axis. The fourth flexible pile group is also provided with a plurality of groups, each of which is closely connected, and each group comprises a plurality of fourth flexible pile monomers closely connected along the same axis.

5. A size arch combination stress induced drainage shipping slope support structure according to claim 4, characterized in that: The first flexible pile monomer, the second flexible pile monomer, the third flexible pile monomer and the fourth flexible pile monomer all adopt cement piles.

6. A size arch combination stress induced drainage shipping slope support structure according to claim 3, characterized in that: The rigid pile at the arch foot of the top arch is connected with the fourth flexible pile group.

7. A size arch combination stress induced drainage shipping slope support structure according to claim 1, characterized in that: The top arch has an arch range of 70-120°, and the bottom arch has an arch range of 50-80°.

8. A size arch combination stress induced drainage shipping slope support structure according to claim 1, characterized in that: The top arch has a larger arch than the bottom arch.

Images