Multi-section wedge pile composite reinforced soil body and natural site soil body structure

Abstract

The application discloses a kind of multi-section wedge pile composite reinforced soil body and natural site soil body structure, it is related to construction engineering pile foundation technical field;To solve the problem of insufficient bearing capacity of pile foundation;The structure, including multi-section wedge pile, the soil body around pile of being arranged at the circumference of multi-section wedge pile and the natural site soil body of being arranged at the circumference of soil body around pile, the pile end of the multi-section wedge pile is provided with pile end soft pad layer;The wedge-shaped inclined surface of the multi-section wedge pile generates high horizontal passive earth pressure to soil body around pile;Soil body around pile amplifies, leads out, and transfers earth pressure to natural site soil body.The application improves the horizontal passive earth pressure of soil body around pile, and then also assists to improve the horizontal passive earth pressure of natural site soil body at the circumference of soil body around pile, while the bearing capacity of multi-section wedge pile is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of pile foundation technology in construction engineering, and in particular to a multi-section wedge pile composite reinforced soil and natural site soil structure. Background Technology

[0002] With the increasing investment in national infrastructure construction, the use of piles in transportation, building, and hydraulic engineering fields is continuously increasing. The bearing capacity of pile foundations is provided by the interaction and coordination between the pile and the surrounding soil. A reasonable interaction mode and coordination ability between the pile and the surrounding soil are the fundamental ways to improve the bearing capacity of pile foundations.

[0003] Because pile foundations are widely used in engineering, they often face complex and unknown geological conditions. For example, in liquefiable soil layers and at the interface between soft and hard layers, the pile body needs to withstand large shear stresses and complex deformations simultaneously, which can easily lead to pile failure. Therefore, how to make pile foundations more stable, safer, and with higher bearing capacity in use has become an urgent problem for engineering technicians. Based on this, we propose a multi-segment wedge pile composite reinforcement soil and natural site soil structure. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-section wedge pile composite reinforced soil and natural site soil structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-segment wedge pile composite reinforced soil and natural site soil structure includes a multi-segment wedge pile, a pile perimeter reinforcing soil disposed around the circumference of the multi-segment wedge pile, and a natural site soil disposed around the pile perimeter reinforcing soil. A pile end cushion layer is provided at the pile end of the multi-segment wedge pile. The wedge-shaped inclined surface of the multi-segment wedge pile generates high-level passive earth pressure on the pile perimeter reinforcing soil. The pile perimeter reinforcing soil amplifies, leads out, and transmits the earth pressure to the natural site soil.

[0007] The soil pressure σ transmitted by the soil around the piles in the natural site soil is supported by the reinforced soil. p Simultaneously, it provides horizontal lateral pressure σ0 to the soil around the pile, where σ0 is σ p The reaction force, with σ p The rapid increase in σ0 also leads to a rapid increase in the frictional resistance fs at the interface between the pile-reinforced soil and the natural site soil; the pile end cushion layer facilitates relative displacement between the multi-section wedge pile and the pile-reinforced soil, enhances the lateral pressure effect, and ensures the effective exertion of passive earth pressure.

[0008] Preferably: the passive earth pressure σ of the reinforced soil B around the pile p for:

[0009]

[0010] c, θ, and θ' represent the cohesion, internal friction angle, and equivalent internal friction angle of the reinforced soil around the pile, respectively. σ p σ0 represents the passive earth pressure on the soil surrounding the pile, and σ0 represents the static earth pressure on the natural soil at the site.

[0011] Preferably: the passive earth pressure σ of the reinforced soil B around the pile p It increases rapidly due to the increase of the internal friction angle θ and the cohesive force c.

[0012] Preferably, the material of the pile end cushion layer is a highly compressible material.

[0013] Preferably, the material of the pile end cushion layer is any one or more of low-dosage cement-soil, foam board, and cardboard, and the thickness of the pile end cushion layer D is 10-30mm.

[0014] Preferably, the reinforced soil around the pile is an intermediate transition body between the natural site soil and the multi-section wedge pile to transfer passive earth pressure, and the intermediate transition body reduces the difference in elastic modulus E and gradient difference.

[0015] Preferably, the multi-section wedge pile is a rigid pile, which includes one of reinforced concrete, wood, and steel; and the outer circumference of the multi-section wedge pile is serrated.

[0016] Preferably, the pile perimeter reinforcement soil is composed of a soil reinforcement material mixed with the natural site soil, and the soil reinforcement material includes one or a mixture of two of cement, water glass, quicklime, and fly ash.

[0017] Preferably, the soil reinforcement material is mixed with the natural site soil by stirring or jet spraying.

[0018] Preferably, the amount of soil reinforcement material is 7% to 35% of the natural site soil.

[0019] Preferably, the invention uses mature construction technology and equipment, is simple to operate and easy to construct, and its engineering testing technology, methods and requirements are the same as those of other pile types, which facilitates the promotion and application of the invention.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The inclined surface of the multi-section wedge pile of the present invention supports the surrounding reinforced soil and the natural site soil, together forming a multi-section wedge pile composite reinforced soil and natural site soil structure. By utilizing the wedge-shaped structure of the multi-section wedge pile body in combination with the surrounding reinforced soil, the passive earth pressure level of the surrounding reinforced soil is increased, which in turn also helps to increase the passive earth pressure level of the natural site soil surrounding the surrounding reinforced soil, and at the same time, the bearing capacity of the multi-section wedge pile is greatly improved.

[0022] 2. The soft cushion layer at the pile end of this invention facilitates relative displacement between the multi-section wedge-shaped pile and the surrounding reinforced soil, enhancing the lateral pressure effect and ensuring the effective exertion of passive earth pressure.

[0023] 3. The reinforced soil around the pile of this invention is the primary carrier that bears the passive earth pressure generated by the multi-section wedge pile. At the same time, the passive earth pressure imparted by the multi-section wedge pile is amplified and transferred to the secondary carrier, namely the natural site soil on the outside, thereby improving the stability of the multi-section wedge pile, saving engineering construction costs, and achieving dual economic and social benefits.

[0024] 4. The reinforced soil around the pile of this invention has higher physical and mechanical properties, reduces the difference in elastic modulus and other properties between the multi-section wedge pile and the natural site soil, and is more conducive to the extraction and transmission of passive earth pressure. This allows the multi-section wedge pile, the reinforced soil around the pile, the natural site soil, and the soft cushion layer D at the pile end to interact, compress, and coordinate with each other, thereby forming a mutually supportive relationship and jointly improving the bearing capacity of the multi-section wedge pile.

[0025] 5. The reinforced soil around the pile in this invention serves as an intermediate transitional soil, bearing the passive earth pressure between the wedge-shaped surface of the multi-section wedge pile and the contact surface of the reinforced soil around the pile. At the same time, it also transmits the passive earth pressure to the natural site soil on the outside after being drawn out. Therefore, the reinforced soil around the pile, the natural site soil, the multi-section wedge pile, and the soft cushion layer D at the pile end interact and coordinate with each other. The combined effect of the four significantly improves the bearing capacity of the multi-section wedge pile.

[0026] 6. As the soil pressure of the reinforced soil increases rapidly, the lateral soil pressure provided by the natural soil at the interface to the reinforced soil also increases rapidly. The rapid increase in lateral pressure also leads to a rapid increase in the frictional resistance fs at the interface between the natural soil and the reinforced soil. The combined effect is that the bearing capacity of the multi-section wedge pile is greatly improved.

[0027] 7. The multi-section wedge pile composite reinforced soil and natural site soil structure of the present invention can significantly improve the bearing capacity of multi-section wedge piles, save engineering construction costs, and achieve dual economic and social benefits, with good economic efficiency and application prospects. Attached Figure Description

[0028] Figure 1This is a schematic diagram of the application state structure of a multi-section wedge pile composite reinforced soil and natural site soil structure proposed in this invention.

[0029] Figure 2 This is a top view schematic diagram of a multi-section wedge pile composite reinforced soil and natural site soil structure proposed in this invention.

[0030] Figure 3 This is a schematic diagram of the stress mode of the pile-reinforced soil in a multi-section wedge pile composite reinforced soil and natural site soil structure proposed in this invention.

[0031] Figure 4 This is a schematic diagram showing the relationship between the equivalent internal friction angle and passive earth pressure of a multi-section wedge pile composite reinforced soil and natural site soil structure proposed in this invention.

[0032] Figure 5 This is a schematic diagram of the passive earth pressure diffusion and transmission of the pile-reinforced soil around the pile in a multi-section wedge pile composite reinforced soil and natural site soil structure proposed in this invention.

[0033] Illustration: A - Multi-section wedge pile; B - Reinforcing soil around the pile; C - Natural site soil; D - Pile tip cushion layer. Detailed Implementation

[0034] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0035] The embodiments of this patent 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 this patent, and should not be construed as limiting this patent.

[0036] Example 1:

[0037] A multi-segment wedge pile composite reinforced soil and natural site soil structure, such as Figure 1-2 As shown, the structure includes a multi-section wedge-shaped pile A and a surrounding reinforced soil mass B distributed around the periphery of the multi-section wedge-shaped pile A; the surrounding area of ​​the reinforced soil mass B is extensively surrounded by natural site soil C; a pile end cushion layer D is set at the pile end of the multi-section wedge-shaped pile A; the wedge-shaped structure of the multi-section wedge-shaped pile A generates passive earth pressure; the surrounding reinforced soil mass B has high physical and mechanical properties, making it an effective carrier for extracting, amplifying, and transmitting earth pressure, thus ensuring the full exertion of passive earth pressure; the natural site soil C provides lateral pressure to the surrounding reinforced soil mass B, increasing the frictional resistance fs at the interface between the surrounding reinforced soil mass B and the natural site soil C. The pile end cushion layer facilitates relative displacement between the multi-section wedge-shaped pile and the surrounding reinforced soil mass, enhancing the lateral pressure effect and ensuring the full exertion of passive earth pressure.

[0038] like Figure 1-3 As shown, the multi-section wedge pile A includes reinforced concrete, wood, steel, etc. The outer circumference of the multi-section wedge pile A is serrated, and the outer surface of the multi-section wedge pile A has a wedge-shaped structure. Preferably, the serrated outer wall of the multi-section wedge pile A can generate a lateral pressure effect on the reinforced soil around the pile.

[0039] Preferably, the wedge-shaped pile body structure of the multi-section wedge pile A generates a lateral pressure effect on the reinforced soil B around the pile, and under the lateral pressure effect, the reinforced soil B around the pile is in a passive earth pressure state.

[0040] Specifically, according to the principles of soil mechanics, the passive earth pressure σ of the soil mass B around the pile is... p for:

[0041]

[0042] In the formula, c, θ, and θ' represent the cohesion, internal friction angle, and equivalent internal friction angle of the reinforced soil B around the pile, respectively, and σ p σ0 represents the passive earth pressure on the soil mass B around the pile, and σ0 represents the at-rest earth pressure on the natural soil mass C.

[0043] The passive earth pressure σ of the reinforced soil B around the pile p It increases rapidly due to the increase of the internal friction angle θ and the cohesive force c.

[0044] From Table 1 and Figure 4 It can be seen that increasing the equivalent internal friction angle θ' can rapidly increase the passive earth pressure σ at the contact surface between the inclined surface of the multi-section wedge pile A and the surrounding reinforced soil B. p Stress levels.

[0045] Table 1:

[0046]

[0047] Table 1 is a comparison table of the relationship between equivalent internal friction angle and passive earth pressure.

[0048] The internal friction angle of natural soil C is generally 5° to 10°, while that of reinforced soil is 25° to 40°. Table 1 shows that after using multi-section wedge piles A to reinforce the soil and construct the natural soil C, the passive earth pressure σ... p The level will be increased several times, and the passive earth pressure σ of the reinforced soil B around the pile will be increased. p After being led out, the natural soil C on the outside provides a reaction force σ0 to the pile-surrounding reinforcing soil B, according to the principles of mechanical equilibrium and soil mechanics. Furthermore, a reaction force f is generated at the interface between the natural soil C and the pile-surrounding reinforcing soil B. s Because of σ pThe bearing capacity of the multi-section wedge pile A is increased by increasing σ0; the final comprehensive effect is reflected in a significant increase in the bearing capacity of the multi-section wedge pile A.

[0049] The multi-section wedge pile A is a rigid pile. The elastic modulus of the multi-section wedge pile A is E1 = 2000~20000 MPa, the elastic modulus of the reinforced soil B around the pile is E2 = 30~600 MPa, and the elastic modulus of the natural site soil C is E3 = 5~30 MPa.

[0050] like Figure 3-5 As shown, the reinforced soil B around the pile serves as an intermediate transition between the natural site soil C and the multi-section wedge pile A. This intermediate transition reduces the difference in elastic modulus E and its gradient, which is beneficial for the transmission of passive earth pressure from the inside out. Since the elastic modulus of the natural site soil C and the multi-section wedge pile A differ significantly, and the reinforced soil B around the pile has a higher elastic modulus, it acts as an intermediate transition while bearing passive earth pressure, reducing the difference in elastic modulus E and its gradient. This facilitates the transmission of passive earth pressure from the inside out and is more conducive to the extraction, amplification, and transmission of passive earth pressure. In other words, the pile-surrounding reinforced soil B acts as an intermediate transitional soil, bearing the passive earth pressure on the contact surface between the wedge-shaped surface of the multi-section wedge pile A and the pile-surrounding reinforced soil B. At the same time, it also transfers the passive earth pressure to the natural site soil C on the outside. Therefore, the pile-surrounding reinforced soil B, the natural site soil C, and the multi-section wedge pile A interact and coordinate with each other. The combined effect of the three significantly improves the bearing capacity of the multi-section wedge pile A. Thus, the pile-surrounding reinforced soil B is an important guarantee and effective carrier for significantly improving the bearing capacity of the multi-section wedge pile A.

[0051] Table 2:

[0052]

[0053]

[0054] Table 2 is a comparison table of field test results for bearing capacity of different pile types.

[0055] Table 2 shows that compared with the ordinary structure of multi-section wedge piles, the pile foundation efficiency of multi-section wedge piles reinforced with soil and natural site soil is more than twice that of the composite reinforced soil structure. Compared with the ordinary equal-diameter pile composite reinforced soil structure, the pile foundation efficiency of multi-section wedge piles reinforced with soil and natural site soil structure is 1.5 times higher. In summary, multi-section wedge piles reinforced with soil and natural site soil structure, as a solution, can significantly improve the bearing capacity of multi-section wedge piles A, save engineering construction costs, reduce carbon emissions, and achieve dual economic and social benefits, demonstrating good economic efficiency and application prospects.

[0056] In this embodiment, the reinforced soil B around the pile is the primary carrier that bears the passive earth pressure generated by the multi-section wedge pile A. At the same time, it draws out the passive earth pressure exerted by the multi-section wedge pile A and transfers it to the secondary carrier, namely the natural site soil C on the outside. By utilizing the wedge-shaped structure of the multi-section wedge pile A in combination with the reinforced soil B around the pile, the passive earth pressure level of the reinforced soil B around the pile is increased, which in turn helps to increase the passive earth pressure level of the natural site soil C surrounding the reinforced soil B around the pile, thereby improving the bearing capacity of the multi-section wedge pile A.

[0057] The reinforced soil around the pile, B, possesses superior physical and mechanical properties, reducing the difference in elastic modulus and other parameters between the multi-section wedge pile A and the natural site soil C. This facilitates the extraction and transmission of passive earth pressure. The soft cushion layer D at the pile tip promotes relative displacement between the multi-section wedge pile and the reinforced soil around the pile, enhancing lateral pressure and ensuring the effective application of passive earth pressure. This interaction, compression, and coordination among the multi-section wedge pile A, the reinforced soil around the pile B, the natural site soil C, and the soft cushion layer D creates a mutually supportive relationship, collectively improving the bearing capacity of the multi-section wedge pile A.

[0058] The theoretical analysis and field test results of this invention [Table 2] both show that the efficiency of the pile foundation using multi-section wedge piles to reinforce the soil and natural site soil structure is greatly improved, and the multi-section wedge piles to reinforce the soil and natural site soil structure has strong practicality and economy.

[0059] Example 2:

[0060] The multi-section wedge pile composite reinforced soil and natural site soil structure described in Embodiment 1 also includes a construction process. The construction adopts mature construction technology and equipment, and is simple and convenient to operate; specifically, it includes the following steps:

[0061] S1: Mark the surface of the natural site soil C and locate the preset range of the multi-section wedge pile composite reinforced soil and the natural site soil structure according to the 'cross line' four-point positioning method;

[0062] S2: Calculate the diameter and height of the soil reinforcement B around the pile, and use construction equipment to mix the natural site soil with the soil reinforcement material during construction.

[0063] S3: After the construction forms the reinforced soil around the pile B, an inspection is conducted to ensure that the performance indicators of the reinforced soil meet the requirements.

[0064] S4: Lift and position the multi-section wedge pile A at the center of the pre-embedded hole and insert it vertically into the surrounding reinforced soil B;

[0065] S5: Conduct initial inspection to ensure construction quality;

[0066] S6: Inspection and acceptance.

[0067] The pile-perimeter reinforced soil B is composed of solidified natural site soil and a mixture of reinforcing materials and natural site soil. The reinforcing materials include, but are not limited to, materials with solidification and reinforcing effects such as cement, water glass, quicklime, and fly ash.

[0068] The verticality deviation of the process is ≤1%, the diameter deviation of the multi-section wedge pile A is ±2cm, and the height deviation of the multi-section wedge pile A is 10cm.

[0069] This embodiment is simple to operate and improves the contact density between the reinforced soil B around the pile, the multi-section wedge pile A, and the natural site soil C, thereby improving the stability of the multi-section wedge pile A.

[0070] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-section wedge pile composite reinforced soil and natural site soil structure, comprising a multi-section wedge pile (A), pile-surrounding reinforced soil (B) disposed around the circumference of the multi-section wedge pile (A), and natural site soil (C) disposed around the pile-surrounding reinforced soil (B), characterized in that, The multi-section wedge pile (A) is provided with a pile end cushion layer (D) at the pile end; the wedge-shaped slope of the multi-section wedge pile (A) generates a high level of passive earth pressure on the pile-surrounding reinforced soil (B); the pile-surrounding reinforced soil (B) amplifies, leads out, and transmits the earth pressure to the natural site soil (C). The natural site soil (C) receives the passive earth pressure transmitted by the pile-reinforced soil (B). At the same time, it provides at-rest earth pressure to the reinforced soil around the pile (B). , for The reaction force, with The rapid improvement This also increases rapidly, thereby increasing the frictional resistance fs at the interface between the pile-surrounding reinforced soil (B) and the natural site soil (C); the pile end cushion layer (D) facilitates relative displacement between the multi-section wedge pile (A) and the pile-surrounding reinforced soil (B), enhancing the lateral pressure effect and ensuring the effective exertion of passive earth pressure; the pile-surrounding reinforced soil (B) is the primary carrier that bears the passive earth pressure generated by the multi-section wedge pile (A), and at the same time, it draws out the passive earth pressure imparted by the multi-section wedge pile (A) and transfers it to the secondary carrier, namely the outer natural site soil (C). The passive earth pressure of the reinforced soil around the pile (B) Due to internal friction angle It increases rapidly with the increase of cohesive force c; The pile-peripheral reinforced soil (B) serves as an intermediate transition between the natural site soil (C) and the multi-section wedge pile (A), transmitting passive earth pressure. This intermediate transition reduces the difference in elastic modulus E and the gradient difference. The outer circumference of the multi-section wedge pile (A) is serrated. The pile-peripheral reinforced soil (B) is composed of soil reinforcement material mixed with the natural site soil (C), with the amount of soil reinforcement material being 7% to 35% of the natural site soil (C).

2. The multi-section wedge-shaped pile composite reinforced soil and natural site soil structure according to claim 1, characterized in that, The passive earth pressure of the reinforced soil around the pile (B) for: ； c. , These represent the cohesion, internal friction angle, and equivalent internal friction angle of the soil around the pile (B). The passive earth pressure on the soil surrounding the pile (B) Let C be the static earth pressure on the natural site soil.

3. The multi-section wedge-shaped pile composite reinforced soil and natural site soil structure according to claim 1, characterized in that, The material of the pile end cushion layer (D) is a highly compressible material.

4. The multi-section wedge-shaped pile composite reinforced soil and natural site soil structure according to claim 3, characterized in that, The material of the pile end cushion layer (D) is any one or more of low-dosage cement-soil, foam board, and cardboard, and the thickness of the pile end cushion layer (D) is 10~30mm.

5. The multi-section wedge pile composite reinforced soil and natural site soil structure according to claim 1, characterized in that, The multi-section wedge pile (A) is a rigid pile, and the multi-section wedge pile (A) includes one of reinforced concrete, wood, and steel.

6. The multi-section wedge-shaped pile composite reinforced soil and natural site soil structure according to claim 1, characterized in that, The soil reinforcement material includes one or a mixture of two of the following: cement, water glass, quicklime, and fly ash.

7. The multi-section wedge-shaped pile composite reinforced soil and natural site soil structure according to claim 6, characterized in that, The soil reinforcement material is mixed with the natural site soil (C) by mixing or jet grouting.

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