Structure for applying foam light soil to goaf backfilling
By adopting a multi-layered structural design in the backfilling of the goaf, including layers of gravel, concrete, and foamed lightweight soil, the instability of foamed cement lightweight soil was solved, thereby improving the stability and compressive strength of the goaf and providing good water treatment capabilities.
Patent Information
- Application Number
- CN202520652764.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-04-09
AI Technical Summary
The existing foamed cement lightweight soil is not stable enough for backfilling mined-out areas. It has low density and many air bubbles inside, resulting in insufficient strength and posing safety hazards.
The structure adopts a multi-layer design, including a gravel layer, a concrete layer, a foamed lightweight soil layer, a drainage layer, a compressive sand and gravel layer, and reinforcing steel bars. Combined with peat moss material, it enhances the stability and compressive strength of the structure, and achieves water treatment function through the drainage layer.
It improves the stability and compressive strength of the backfill structure in the goaf, prevents sinkholes, achieves effective water treatment and connection strength, and enhances the overall strength and waterproof performance of the structure.
Smart Images
Figure CN223767552U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of backfilling technology for mined-out areas, specifically a structure for applying foamed lightweight soil to backfill mined-out areas. Background Technology
[0002] Goaf areas are "cavities" created beneath the earth's surface by human excavation or natural geological movements. The existence of goaf areas poses significant safety risks to mine operations, as personnel and machinery may fall into them and be injured. Therefore, after mining operations are completed, goaf areas need to be backfilled to prevent collapse. Currently, foamed cement lightweight soil is mainly used for backfilling. However, foamed cement lightweight soil has a low density, contains many closed air bubbles, and lacks sufficient strength and stability during use. Utility Model Content
[0003] The purpose of this invention is to provide a structure for backfilling mined-out areas using foamed lightweight soil, in order to solve the problem of instability mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a structure for backfilling mined-out areas using foamed lightweight soil, comprising a mined-out body, wherein a layer of gravel is laid at the bottom of the mined-out body, and a concrete layer is provided at the top of the gravel layer, a layer of foamed lightweight soil is provided at the top of the concrete layer, a drainage layer is provided at the top of the foamed lightweight soil layer, a pressure-resistant sand and gravel layer is provided at the top of the drainage layer, and a leveling sand layer is provided at the top of the pressure-resistant sand and gravel layer.
[0005] Preferably, a water-conducting soil layer is provided on the outer side of the foamed lightweight soil layer, and the outer side of the water-conducting soil layer is in contact with the inner wall of the pebble layer.
[0006] Preferably, the leveling sand layer, the compressive gravel layer, and the drainage layer are all located inside the water-conducting soil layer, and the top of the leveling sand layer is flush with the top of the goaf body.
[0007] Preferably, the interior of the foamed lightweight soil layer is provided with multiple reinforcing steel bars, and the two ends of the reinforcing steel bars pass through the foamed lightweight soil layer and the water-conducting soil layer in sequence and extend into the interior wall of the goaf body.
[0008] Preferably, the reinforcing bars are arranged in an alternating pattern inside the foamed lightweight soil layer, and the two ends of the reinforcing bars are spiral-tipped.
[0009] Preferably, both the pebble layer and the concrete layer are located below the water-conducting soil layer, and the bottom of the concrete layer is in contact with the top of the pebble layer.
[0010] Preferably, both the drainage layer and the water-conducting soil layer are made of peat moss material, and the outer side of the drainage layer is in contact with the inner wall of the water-conducting soil layer.
[0011] Compared with related technologies, the foamed lightweight soil provided by this utility model has the following beneficial effects when applied to the backfilling of mined-out areas:
[0012] This utility model provides a gravel layer and a concrete layer. By combining the gravel layer and the concrete layer, the stability and strength of the bottom of the structure can be greatly increased, thereby increasing the compressive strength of the structure and preventing the bottom of the goaf from sinking. The structure has a compressive sand and gravel layer and a drainage layer above the foamed lightweight soil layer. The compressive sand and gravel layer can further increase the strength of the structure and improve its compressive performance. The drainage layer can realize the drainage performance of the structure. Combined with the water-conducting soil layer, the structure can effectively drain water to the inner wall of the goaf, realizing the water treatment function of the structure. Finally, the structure is also equipped with reinforcing steel bars. The reinforcing steel bars can connect the goaf and the foamed lightweight soil layer, further increasing the strength of the structure. Attached Figure Description
[0013] Figure 1 This is a frontal cross-sectional view of the present invention.
[0014] Figure 2 This is a top view of the structure of this utility model;
[0015] Figure 3 This is a side sectional view of the present invention.
[0016] Figure 4 This is an enlarged structural diagram of point A of this utility model.
[0017] In the diagram: 1. Foamed lightweight soil layer; 2. Gravel layer; 3. Goaf body; 4. Concrete layer; 5. Water-conducting soil layer; 6. Leveled sand layer; 7. Reinforcing steel; 8. Sand and gravel layer; 9. Drainage layer. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0019] Example 1: Please refer to Figure 1-4A structure for backfilling mined-out areas using foamed lightweight soil includes a mined-out body 3, a gravel layer 2 at the bottom of the mined-out body 3, a concrete layer 4 at the top of the gravel layer 2, a foamed lightweight soil layer 1 at the top of the concrete layer 4, a drainage layer 9 at the top of the foamed lightweight soil layer 1, a compressive sand and gravel layer 8 at the top of the drainage layer 9, and a leveling sand and soil layer 6 at the top of the compressive sand and gravel layer 8.
[0020] Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this structure is mainly suitable for goaf locations close to the ground. It involves destroying the top of the goaf, leaving it exposed. A layer of gravel (2) is laid at the bottom of the goaf, followed by a concrete layer (4). The combination of the gravel layer (2) and the concrete layer (4) significantly increases the stability and strength of the structure's base, thereby increasing its compressive strength and preventing subsidence at the bottom of the goaf body (3). A layer of foamed lightweight soil (1) is laid on top of the concrete layer (4). 1. It has good waterproof and low-elasticity shock absorption properties, which can prevent the structure from sinking due to water infiltration in the later stage, and can also prevent the structure from being affected by vibration in the later stage. Finally, the structure has a compressive sand and gravel layer 8 and a drainage layer 9 above the foamed lightweight soil layer 1. The compressive sand and gravel layer 8 can further increase the strength of the structure and improve its compressive performance. The drainage layer 9 can effectively drain the groundwater to the inner wall of the goaf body 3 through the drainage layer 9, preventing the groundwater from interfering with the structure.
[0021] A water-conducting soil layer 5 is provided on the outside of the foamed lightweight soil layer 1, and the outside of the water-conducting soil layer 5 is in contact with the inner wall of the gravel layer 2.
[0022] The leveling sand layer 6, the compressive sand and gravel layer 8, and the drainage layer 9 are all located inside the water-conducting soil layer 5, and the top of the leveling sand layer 6 is flush with the top of the goaf body 3.
[0023] Both the gravel layer 2 and the concrete layer 4 are located below the water-conducting soil layer 5, and the bottom of the concrete layer 4 is in contact with the top of the gravel layer 2.
[0024] Both the drainage layer 9 and the water-conducting soil layer 5 are made of peat moss material, and the outer side of the drainage layer 9 is in contact with the inner wall of the water-conducting soil layer 5.
[0025] Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, by setting up a water-conducting soil layer 5, and by connecting the water-conducting soil layer 5 to the drainage layer 9, the water collected by the drainage layer 9 can permeate into the inner wall of the goaf body 3 through the water-conducting soil layer 5. The water is then treated by utilizing the goaf body 3, thereby improving the water treatment efficiency and quality of this structure.
[0026] Multiple reinforcing steel bars 7 are installed inside the foamed lightweight soil layer 1, and the two ends of the reinforcing steel bars 7 pass through the foamed lightweight soil layer 1 and the water-conducting soil layer 5 in sequence and extend into the inner wall of the goaf body 3.
[0027] The reinforcing steel bars 7 are arranged in an alternating pattern inside the foamed lightweight soil layer 1, and the two ends of the reinforcing steel bars 7 are spiral-tipped and tapered.
[0028] Specifically, such as Figure 1 and Figure 3 As shown, by providing reinforcing steel bars 7, before laying the foamed lightweight soil layer 1, the reinforcing steel bars 7 can be pre-installed on the inner wall of the goaf body 3 above the concrete layer 4. This allows the structure to improve the strength of the foamed lightweight soil layer 1 after it is laid, thus achieving the connection between the foamed lightweight soil layer 1 and the goaf body 3. This improves the strength of the device and effectively avoids the possibility of collapse.
[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A structure for the application of foamed lightweight soil for backfilling of a mined-out area, comprising a body of the mined-out area (3), characterised in that: The bottom end of the gob area body (3) is paved with a melon seed stone layer (2), the top end of the melon seed stone layer (2) is provided with a concrete layer (4), the top end of the concrete layer (4) is provided with a foam light soil layer (1), the top end of the foam light soil layer (1) is provided with a drainage layer (9), the top end of the drainage layer (9) is provided with a compression sandstone layer (8), and the compression sandstone layer (8) is provided with a flattened sand layer (6).
2. A structure for backfilling of goaf with foam light soil according to claim 1, characterized in that: The outer side of the foam light soil layer (1) is provided with a water guiding soil layer (5), and the outer side of the water guiding soil layer (5) is in contact with the inner wall of the melon seed stone layer (2).
3. A structure for backfilling of goaf with foam light soil according to claim 2, characterized in that: The flattened sand layer (6), the compression sandstone layer (8) and the drainage layer (9) are all arranged in the interior of the water guiding soil layer (5), and the top end of the flattened sand layer (6) is flush with the top end of the gob area body (3).
4. A structure for backfilling of goaf with the foamed lightweight soil according to claim 1, characterized in that: A plurality of reinforcing steel bars (7) are arranged in the interior of the foam light soil layer (1), and the two ends of the reinforcing steel bars (7) sequentially penetrate the foam light soil layer (1) and the water guiding soil layer (5) and extend to the interior of the inner wall of the gob area body (3).
5. A structure for backfilling of mined-out areas with the foamed lightweight soil according to claim 4, characterized in that: The reinforcing steel bars (7) are arranged in a staggered manner in the interior of the foam light soil layer (1), and the shapes of the two ends of the reinforcing steel bars (7) are screw tip tap shapes.
6. A structure for backfilling of goaf with the foamed lightweight soil according to claim 1, characterized in that: The melon seed stone layer (2) and the concrete layer (4) are both arranged below the water guiding soil layer (5), and the bottom end of the concrete layer (4) is in contact with the top end of the melon seed stone layer (2).
7. A structure for backfilling of mined-out areas using the foamed lightweight soil according to claim 1, characterized in that: The drainage layer (9) and the water guiding soil layer (5) are both made of grass charcoal soil material, and the outer side of the drainage layer (9) is in contact with the inner wall of the water guiding soil layer (5).