Soft soil foundation reinforcing structure

Abstract

The utility model relates to the technical field of highway engineering, in particular to a soft soil foundation reinforcing structure. The structure comprises a roadbed, a soft soil layer is arranged below the roadbed, slope toe lines are arranged on the two sides of the roadbed, and the structure further comprises continuous anti-seepage walls, jet grouting piles and a shallow solidification layer, and the longitudinal continuous anti-seepage walls are arranged on the inner sides of the slope toe lines on the two sides of the roadbed; continuous anti-seepage walls are further arranged between the longitudinal continuous anti-seepage walls in the cross section direction of the roadbed to form rectangular continuous anti-seepage wall sections, the depth of the continuous anti-seepage walls enters the impermeable layer, jet grouting piles are arranged on the soft soil layer in the rectangular continuous anti-seepage wall sections, a shallow solidification layer is arranged below the roadbed, and the shallow solidification layer is arranged in the roadbed. Therefore, the box-type soft soil foundation reinforcing structure is formed. The product can reduce the overall construction cost, and can achieve a better soft soil foundation treatment effect at the same time.

Description

Technical Field

[0001] This utility model relates to the field of highway engineering technology, specifically a soft soil foundation reinforcement structure. Background Technology

[0002] In highway engineering projects in soft soil areas, when the soft soil layer is thick, foundation treatment typically employs surcharge preloading, prestressed concrete pipe piles, or cement-soil mixing plants. Surcharge preloading involves inserting plastic drainage boards into the soft soil and then applying pressure from above to promote drainage and consolidation. Cement-soil mixing piles or prestressed concrete pipe piles are driven into the soft soil foundation to bear the load from above, ensuring post-construction settlement. The main drawbacks of existing technologies are:

[0003] (1) The surcharge preloading method has a long construction period, limited foundation bearing capacity, and large post-construction settlement, resulting in poor effect and bridge approach slab settlement.

[0004] (2) Prestressed pipe piles have a better treatment effect, but the amount of pipe pile work is large and the overall cost is high.

[0005] (3) The cement-soil mixing equipment has a shallow treatment depth, a large workload, and a poor effect on soft soil treatment. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] In view of the shortcomings of the existing technology, this utility model provides a soft soil foundation reinforcement structure, which can reduce the overall project cost and achieve a better soft soil foundation treatment effect.

[0008] (II) Technical Solution

[0009] A soft soil foundation reinforcement structure includes a roadbed with a soft soil layer beneath it. The roadbed has slope toe lines on both sides. Further, it includes continuous cut-off walls, jet grouting piles, and a shallow solidification layer. Longitudinal continuous cut-off walls are installed along the inner side of the slope toe lines on both sides of the roadbed. Continuous cut-off walls are further installed between the longitudinal continuous cut-off walls along the cross-sectional direction of the roadbed to form rectangular continuous cut-off wall segments. The depth of the continuous cut-off walls extends into the impermeable layer. Jet grouting piles are arranged in the soft soil layer within each rectangular continuous cut-off wall segment. A shallow solidification layer is installed beneath the roadbed, collectively forming a box-shaped soft soil foundation reinforcement structure.

[0010] Preferably, the continuous seepage barrier extends 2m into the underground impermeable layer, and the thickness of the continuous seepage barrier is 0.8m.

[0011] Preferably, the length of the rectangular continuous anti-seepage wall segment is one segment every 30m along the roadbed travel direction.

[0012] As preferred, the continuous anti-seepage wall adopts double-shaft rotary jet piles, the pile diameter is 50cm, and the longitudinal and transverse direction overlaps 20cm.

[0013] As preferred, the thickness of the shallow solidification layer is 1.5m.

[0014] As preferred, the pile spacing of the rotary jet pile is 5m, and the rotary jet pile penetrates into the impermeable layer 2m below the soft soil layer.

[0015] (Three) beneficial effects

[0016] Compared with the prior art, the utility model provides a kind of soft soil foundation reinforcing structure, by underground continuous anti-seepage wall combination shallow solidification technology, form a closed impermeable soil box as foundation treatment structure;New box type foundation treatment structure and the foundation treatment form of rotary jet pile combination;Underground continuous anti-seepage wall is arranged in highway longitudinal and transverse direction mode and the technical parameter of anti-seepage wall is more optimal, it has the following advantages: this soft soil foundation treatment technology absorbs the impermeable advantage of traditional underground continuous wall, shallow solidification etc.Process, by the loss of constraint water body, prevent soft soil from solidification reaction, to control post-construction settlement;The whole treatment technology engineering volume is small, and engineering cost is low, construction speed is fast, and it is small to be interfered by outside. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the plane layout of the product;

[0018] Figure 2 It is the cross-sectional view of Figure 1 ;

[0019] Figure 3 It is the longitudinal cross-sectional view of Figure 1 .

[0020] Label explanation: roadbed 1, soft soil layer 2, slope foot line 3, continuous anti-seepage wall 4, rotary jet pile 5, shallow solidification layer 6, rectangular continuous anti-seepage wall section 7, impermeable layer 8. DETAILED DESCRIPTION

[0021] The utility model will be further explained in detail in connection with the drawings, wherein same parts are expressed with same drawing marks, and need to be explained, the words "front", "back", "left", "right", "up" and "down", "bottom surface" and "top surface" in following description refer to the direction in drawing, and the words "inner" and "outer" refer to the direction towards or away from the geometric center of specific component respectively.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Design concept: Design a special soft soil foundation reinforcement structure, which uses an underground continuous seepage barrier wall and shallow solidification in the soft soil layer to form a closed and impermeable box, ensuring that the water content of the soft soil within the roadbed area does not seep to the outside due to the upper load.

[0024] Example:

[0025] like Figures 1-3 As shown, the technical solution of this product is as follows: A soft soil foundation reinforcement structure includes a roadbed 1, a soft soil layer 2 beneath the roadbed 1, and slope toe lines 3 on both sides of the roadbed 1. Further, it includes continuous cut-off walls 4, jet grouting piles 5, and a shallow solidification layer 6. Longitudinal continuous cut-off walls 4 are installed along the inner side of the slope toe lines 3 on both sides of the roadbed 1 (highway). Continuous cut-off walls 4 are further installed between the longitudinal continuous cut-off walls 4 along the cross-sectional direction of the roadbed 1 to form rectangular continuous cut-off wall segments 7. The length of the rectangular continuous cut-off wall segments 7 is 30m per segment along the direction of travel of the roadbed 1 (highway). The continuous cut-off walls 4 penetrate into the impermeable layer 8. Jet grouting piles 5 are arranged in the soft soil layer within each rectangular continuous cut-off wall segment 7. A shallow solidification layer 6 with a thickness of 1.5m is installed under the roadbed 1, together forming a box-shaped soft soil foundation reinforcement structure.

[0026] In this embodiment, the continuous seepage barrier 4 extends 2m into the impermeable layer (8) underground, and the thickness of the continuous seepage barrier 4 is 0.8m. The continuous seepage barrier 4 adopts a double-axis jet grouting pile 5 with a pile diameter of 50cm and an overlap of 20cm in both longitudinal and transverse directions.

[0027] In this embodiment, the spacing between the jet grouting piles 5 is 5m, and the jet grouting piles 5 penetrate 2m into the impermeable layer (8) below the soft soil layer 2.

[0028] The structure and working principle of this product are explained in more detail below:

[0029] like Figure 1The diagram shows a plan view of the soft soil foundation treatment. In this embodiment, a continuous underground anti-seepage wall 4 is installed on both sides of the highway, penetrating 2 meters into the underlying silty clay impermeable layer (8) of the soft soil layer 2. The thickness of the continuous underground anti-seepage wall 4 is 0.8 meters, and its length is arranged in 30-meter segments along the direction of the highway (roadbed). The continuous underground anti-seepage wall 4 forms a rectangular structure on the ground plane (rectangular continuous anti-seepage wall segment 7). The continuous underground anti-seepage wall 4 adopts the double-axis jet grouting pile 5 process, with a pile diameter of 50 cm and an overlap of 20 cm in both longitudinal and transverse directions. The main purpose of the continuous underground anti-seepage wall 4 is to prevent the lateral flow of water in the soft soil layer 2, and at the same time bear part of the horizontal force generated by the fill load of the roadbed 1.

[0030] like Figure 2 The diagram shows the cross-sectional design for soft soil treatment. After constructing the underground continuous anti-seepage wall 4 within the subgrade 1 area, a 1.5-meter shallow solidification layer 6 is constructed on the surface of the foundation. The solidified soil mainly prevents groundwater from returning to the surface under the soil pressure of the subgrade 1, while also improving the bearing capacity of the foundation.

[0031] like Figure 3 As shown in the longitudinal section design drawing for soft soil treatment, after constructing the shallow solidification layer 6, jet grouting piles 5 are constructed within the subgrade 1 area, with a pile spacing of 5 meters and a depth determined according to the bearing capacity of the foundation, generally penetrating 2 meters below the soft soil layer 2.

[0032] In this example, the underground continuous seepage barrier wall 4 and the shallow solidification layer 6 are mainly used to prevent the loss of groundwater in the soft soil below the roadbed 1. After the roadbed 1 is filled, the water in the soft soil is under the action of excess pore water pressure for a long time. Since the water cannot drain outward, the soil will not undergo a consolidation reaction, thus ensuring that the soil is not compressed and that the entire foundation does not settle.

[0033] In this example, jet grouting pile 5 is mainly used to transfer the load of the upper subgrade 1 to the deep bottom layer to ensure that the entire seepage prevention system is not damaged by earth pressure. When the fill height of the subgrade 1 is not large, jet grouting pile 5 can be omitted.

[0034] This embodiment uses a continuous underground seepage barrier wall 4 and a shallow solidification layer 6 to form a closed, impermeable box, ensuring that the water content of the soft soil within the subgrade 1 does not seep to the outside due to the upper load, thereby controlling the overall settlement of subgrade 1. Simultaneously, a certain number of jet grouting piles 5 are arranged inside the box to bear the upper load of the subgrade 1 fill, further reducing the additional stress on the soft soil layer 2, thus controlling the overall settlement of subgrade 1. This new foundation treatment method can effectively reduce subgrade settlement, improve the subgrade bearing capacity, and reduce the cost of soft soil foundation treatment projects.

[0035] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soft ground improvement structure comprising a roadbed, a soft ground layer under the roadbed, and a toe line on both sides of the roadbed, characterized in that: The continuous anti-seepage wall, the jet grouting pile and the shallow curing layer are arranged, the longitudinal continuous anti-seepage wall is arranged along the inside of the slope foot line of the two sides of the roadbed, the longitudinal continuous anti-seepage wall is further arranged along the cross section direction of the roadbed to form a rectangular continuous anti-seepage wall segment, the continuous anti-seepage wall is arranged into the impermeable layer, the soft soil layer in each rectangular continuous anti-seepage wall segment is arranged with the jet grouting pile, the shallow curing layer is arranged under the roadbed, and the box type soft soil foundation reinforcing structure is formed.

2. The soft ground reinforcement structure according to claim 1, wherein: The continuous anti-seepage wall is arranged into the impermeable layer 2 m underground, and the thickness of the continuous anti-seepage wall is 0.8 m.

3. The soft ground reinforcement structure of claim 1, wherein: The length of the rectangular continuous anti-seepage wall segment is 30 m along the running direction of the roadbed.

4. The soft ground reinforcement structure of claim 1, wherein: The continuous anti-seepage wall adopts double-shaft jet grouting piles, the pile diameter is 50 cm, and the longitudinal and transverse directions overlap 20 cm.

5. The soft ground reinforcement structure of claim 1, wherein: The thickness of the shallow curing layer is 1.5 m.

6. The soft ground reinforcement structure of claim 1, wherein: The pile spacing of the jet grouting pile is 5 m, and the jet grouting pile is arranged into the impermeable layer 2 m below the soft soil layer.

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