Soft soil subgrade treatment structure
Patent Information
- Application Number
- CN202521709560.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-12
- Publication Date
- 2026-09-18
- Estimated Expiration
- 2035-08-12
AI Technical Summary
换填法：将软土层挖除后回填砂石等高强度材料，优点是施工简单、效果直观，缺点是工程量巨大、成本高，且不适用于深层软土
该一种软土路基处理结构，通过设置排水管、土工格栅和砂石垫层，使得协同作用，使路基承载力提高40%以上，且施工周期缩短50%，效率较快，综合成本降低30%，同时土工格栅的应用有效抑制不均匀沉降，路基工后沉降量小于5cm，并且环保性强，无强振动或化学污染。
Smart Images
Figure CN224769148U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of soft soil subgrade technology, and in particular to a soft soil subgrade treatment structure. Background Technology
[0002] Soft soil subgrades are common in highway engineering. Their high water content, low strength, and high compressibility lead to poor subgrade stability and make them prone to settlement, slippage, and other problems. Currently, the main treatment technologies for soft soil subgrades include replacement, preloading, dynamic compaction, and cement mixing piles.
[0003] Specific solutions based on existing technologies: Replacement method: After the soft soil layer is excavated, it is backfilled with high-strength materials such as sand and gravel. The advantages are simple construction and obvious results. The disadvantages are huge amount of work, high cost, and it is not suitable for deep soft soil.
[0004] Preloading method: Accelerates the consolidation of soft soil by surcharge or vacuum preloading. The advantage is that the cost is low, but the disadvantage is that the cycle is long and the effect on deep soft soil is limited.
[0005] Dynamic compaction: This method uses a heavy hammer to compact soft soil. Its advantages are fast construction speed, but its disadvantages are high noise and strong vibration, which may have an impact on the surrounding environment.
[0006] Cement mixing pile method: A composite foundation is formed by mixing piles. The advantage is that the bearing capacity is significantly improved. The disadvantages are that the construction is complicated, the cost is high, and the quality of the pile is greatly affected by geological conditions.
[0007] Existing technologies generally suffer from low construction efficiency, high cost, limited applicability, or significant environmental impact, and cannot effectively suppress uneven settlement. Therefore, this application proposes a soft soil subgrade treatment structure. Utility Model Content
[0008] In view of the shortcomings of the prior art, this utility model provides a soft soil subgrade treatment structure, which overcomes the shortcomings of the prior art and aims to solve the problems in the background art.
[0009] To achieve the above objectives, this application adopts the following technical solution: a soft soil subgrade treatment structure, including a soft soil layer and a drainage ditch, wherein multiple drainage pipes are fixedly connected to the inner wall of the soft soil layer, a geogrid is laid on the top of the soft soil layer, and a sand and gravel cushion layer is laid on the top of the geogrid, and a transition layer is laid on the top of the sand and gravel cushion layer, wherein a reinforcing mesh is embedded in the inner wall of the transition layer.
[0010] In a preferred embodiment, the drainage pipe is partially disposed inside the soft soil layer and has multiple water inlets, with one end of the drainage pipe away from the soft soil layer positioned above the drainage ditch.
[0011] By adopting the above technical solution, water that has seeped into the soft soil layer can enter the interior of the drainage pipe through the water inlet hole, and then be discharged into the drainage ditch through the drainage pipe for drainage.
[0012] In a preferred embodiment, the outer edge of the drainage pipe is wrapped with non-woven geotextile, and the drainage pipe is made of PVC corrugated pipe.
[0013] By adopting the above technical solutions, the durability of the drainage pipes can be guaranteed, thus ensuring that the exposed drainage pipes will not be easily corroded by rainwater, and extending their service life.
[0014] In a preferred embodiment, the top of the transition layer is provided with multiple grouting holes, and the multiple grouting holes penetrate the geogrid, the sand and gravel cushion layer and the inner wall of the transition layer.
[0015] By adopting the above technical solution, mortar can be injected into the inner wall of the geogrid, sand and gravel cushion and transition layer through the grouting hole, thereby connecting the geogrid, sand and gravel cushion and transition layer, ensuring the firmness of the connection, effectively avoiding delamination, and improving the strength above the soft soil layer.
[0016] In a preferred embodiment, the geogrid is made of biaxially oriented polypropylene, and the sand and gravel cushion layer has a thickness of 30cm and a particle size of 5-20mm.
[0017] By adopting the above technical solution, it is possible to provide reverse filtration and stress diffusion functions, prevent impurities in the water from entering the interior of the drain pipe, and increase the overall strength.
[0018] In a preferred embodiment, cement-modified soil with a thickness of 15cm and a cement content of 8% can be added between the geogrid and the gravel cushion layer.
[0019] By adopting the above technical solutions, early strength can be further improved, ensuring robustness.
[0020] The beneficial effects of this application are: This soft soil subgrade treatment structure, through the installation of drainage pipes, geogrids, and sand and gravel cushion layers, achieves a synergistic effect, increasing the subgrade bearing capacity by more than 40%, shortening the construction period by 50%, increasing efficiency, and reducing overall costs by 30%. At the same time, the application of geogrids effectively suppresses uneven settlement, with the post-construction settlement of the subgrade being less than 5cm. Furthermore, it is environmentally friendly, with no strong vibrations or chemical pollution. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the unfolded structure of this application; Figure 3 This is a cross-sectional structural diagram of this application; Figure 4 This is a schematic diagram of the unfolded structure of the nonwoven geotextile of this application.
[0022] The following are labeled in the diagram: 1. Soft soil layer; 2. Drainage pipe; 3. Non-woven geotextile; 4. Drainage ditch; 5. Geogrid; 6. Sand and gravel cushion layer; 7. Transition layer; 8. Grouting hole; 9. Reinforcing mesh. Detailed Implementation
[0023] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0024] Reference Figure 1-4 A soft soil subgrade treatment structure includes a soft soil layer 1 and a drainage ditch 4. Multiple drainage pipes 2 are fixedly connected to the inner wall of the soft soil layer 1. A geogrid 5 is laid on the top of the soft soil layer 1, and a sand and gravel cushion layer 6 is laid on the top of the geogrid 5. A transition layer 7 is laid on the top of the sand and gravel cushion layer 6, and a reinforcing mesh 9 is embedded in the inner wall of the transition layer 7.
[0025] See Figure 1 and Figure 4 The drainage pipe 2 is located inside the soft soil layer 1 and has multiple water inlets. The end of the drainage pipe 2 away from the soft soil layer 1 is located above the drainage ditch 4, so that water that has seeped into the soft soil layer 1 can enter the interior of the drainage pipe 2 through the water inlets and then be discharged into the interior of the drainage ditch 4 through the drainage pipe 2 for drainage.
[0026] See Figure 4 The outer edge of the drainage pipe 2 is wrapped with non-woven geotextile 3. The drainage pipe 2 is made of PVC corrugated pipe, which ensures the durability of the drainage pipe 2 and prevents it from being easily eroded by rainwater when exposed to the outside, thus improving its service life.
[0027] See Figure 1 - Figure 4 Multiple grouting holes 8 are provided at the top of the transition layer 7, and the multiple grouting holes 8 penetrate the inner wall of the geogrid 5, the sand and gravel cushion 6 and the transition layer 7, so that mortar can be injected into the inner wall of the geogrid 5, the sand and gravel cushion 6 and the transition layer 7 through the grouting holes 8, thereby connecting the geogrid 5, the sand and gravel cushion 6 and the transition layer 7, ensuring the firmness of the connection, effectively avoiding delamination, and improving the strength above the soft soil layer 1.
[0028] See Figure 3The geogrid 5 is made of biaxially oriented polypropylene, and the sand and gravel cushion layer 6 is 30cm thick with a particle size of 5-20mm. This provides reverse filtration and stress diffusion functions, prevents impurities in the water from entering the interior of the drainage pipe 2, and increases the overall strength.
[0029] See Figure 3 Cement-modified soil with a thickness of 15cm and a cement content of 8% can be added between the geogrid 5 and the sand and gravel cushion layer 6 to further improve early strength and ensure solidity.
[0030] Working principle: After the site is leveled, drainage pipes 2 are driven in at the designed intervals, drainage ditches 4 are excavated and laid with gravel, which is then connected to the drainage pipes 2. Next, geogrid 5 and a sand and gravel cushion layer 6 are laid in layers on top of the soft soil layer 1, with the geogrid 5 overlapping at least 30cm. Then, a transition layer 7 is filled in layers on the sand and gravel cushion layer 6, with each layer compacted to a thickness ≤20cm, until the reinforcing mesh 9 is embedded inside the transition layer 7, thereby increasing the overall strength. Simultaneously, mortar can be injected into the grouting holes 8.
[0031] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., 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 utility model 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] The present invention has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present invention. Those skilled in the art can make various modifications and variations to the present invention based on its spirit and principles, and these modifications and variations are also within the scope of the present invention.
Claims
1. A soft soil subgrade treatment structure comprising a soft soil layer (1) and a drainage ditch (4), characterized by, The inner wall of the soft soil layer (1) is fixedly connected with multiple drainage pipes (2), the top of the soft soil layer (1) is covered with a geogrid (5), and the top of the geogrid (5) is covered with a sand and gravel cushion layer (6). The top of the sand and gravel cushion layer (6) is covered with a transition layer (7), and the inner wall of the transition layer (7) is inlaid with a reinforcing mesh (9).
2. The soft soil subgrade treatment structure according to claim 1, wherein The drainage pipe (2) is located inside the soft soil layer (1) and has multiple water inlets. The end of the drainage pipe (2) away from the soft soil layer (1) is located above the drainage ditch (4).
3. The soft soil subgrade treatment structure according to claim 1, wherein The outer edge of the drainage pipe (2) is wrapped with non-woven geotextile (3), and the drainage pipe (2) is made of PVC corrugated pipe.
4. The soft soil subgrade treatment structure according to claim 1, wherein The top of the transition layer (7) is provided with multiple grouting holes (8), and the multiple grouting holes (8) penetrate the inner wall of the geogrid (5), the sand and gravel cushion layer (6) and the transition layer (7).
5. The soft soil subgrade treatment structure according to claim 1, characterized in that, The geogrid (5) is made of biaxially oriented polypropylene, and the sand and gravel cushion layer (6) has a thickness of 30cm and a particle size of 5-20mm.
6. The soft soil subgrade treatment structure according to claim 1, wherein A cement-modified soil layer with a thickness of 15cm is provided between the geogrid (5) and the sand and gravel cushion layer (6).