Goaf grouting reinforcement construction composite roadbed structure

Abstract

The utility model relates to the technical field of road construction, and discloses a goaf grouting reinforcement construction composite roadbed structure which comprises a curtain wall, a reinforcement area and a composite roadbed, through grouting reinforcement of the curtain wall and the reinforcement area, particularly a closed-loop structure formed on the outer side of a goaf by the curtain wall, the potential influence of the goaf on an underground foundation is effectively isolated, and the goaf grouting reinforcement construction composite roadbed structure is improved. And meanwhile, the common grouting holes in the reinforcing area are uniformly distributed, so that the overall reinforcing effect is ensured, and the bearing capacity of the roadbed above the underground foundation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of road construction, and particularly to a composite roadbed structure for grouting reinforcement construction in a goaf. Background Technique

[0002] The grouting reinforcement construction in a goaf is an engineering technology used to handle the cavities left after underground mining such as coal mines and metal mines. This technology injects slurry into the goaf to fill and stabilize the goaf, prevent geological disasters such as ground settlement and collapse, and ensure the safety of the ground composite roadbed structure. The composite roadbed structure refers to a design method that combines various materials and structural forms in roadbed design to improve the stability and bearing capacity of the roadbed. In the existing composite roadbed structure for grouting reinforcement construction in a goaf, during the grouting reinforcement process, due to the unreasonable structures of the curtain and grouting holes, the slurry flows away and cannot effectively fill the goaf, resulting in the instability of the upper roadbed and the need for later repair or re-reinforcement. Content of the Utility Model

[0003] The purpose of the utility model is to provide a composite roadbed structure for grouting reinforcement construction in a goaf, so as to solve the problem in the above background technique that due to the unreasonable structures of the curtain and grouting holes, the slurry flows away and cannot effectively fill the goaf, resulting in the instability of the upper roadbed and the need for later repair or re-reinforcement.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] The composite roadbed structure for grouting reinforcement construction in a goaf includes a curtain wall, a reinforcement area, and a composite roadbed. The curtain wall includes a number of curtain grouting holes. The hole spacing of the number of curtain grouting holes is 8 - 10 m, and they are arranged in rows 10 - 12 m outside the goaf in a closed-loop shape to form a curtain wall. The reinforcement area includes a number of ordinary grouting holes. The ordinary grouting holes are evenly arranged in a plum blossom shape within the closed-loop curtain wall. The hole spacing is 15 - 18 m and the row spacing is 15 - 18 m within the roadbed area, and the hole spacing is 20 - 22 m and the row spacing is 25 - 28 m from the outside of the roadbed area to the curtain wall area. The depths of the curtain grouting holes and the ordinary grouting holes are both from the original ground line to 2 - 3 m below the bottom plate of the goaf. The roadbed is on the original ground line above the curtain wall and the reinforcement area. The composite roadbed includes a pavement structure layer, a roadbed layer, a transition layer, and a rockfill layer arranged in sequence from top to bottom.

[0006] Furthermore, the hole spacing of the number of curtain grouting holes is 10 m, and they are arranged in rows 10 m outside the goaf in a closed-loop shape to form a curtain wall. The hole spacing of the ordinary grouting holes is 15 m and the row spacing is 15 m within the roadbed area, and the hole spacing is 20 m and the row spacing is 25 m from the outside of the roadbed area to the curtain wall area. The depths of the curtain grouting holes and the ordinary grouting holes are both from the original ground line to 2 m below the bottom plate of the goaf.

[0007] Furthermore, the filling material for the roadbed layer is stone with a particle size < 10 cm.

[0008] Furthermore, the transition layer is 40 cm thick and includes an isolation layer and an earth-rock layer from top to bottom. The isolation layer is 20 cm thick and is provided with geotextiles; the earth-rock layer is 20 cm thick and filled with transported earth-rock with a particle size less than 150 mm.

[0009] Furthermore, the filling material for the rockfill layer is stone with a particle size of 200 mm to 500 mm.

[0010] Furthermore, both sides of the composite roadbed are slopes. The slope lines of the slopes are divided into a first slope line and a second slope line from top to bottom. The ratio of the first slope line is 1:1.5; the ratio of the second slope line is 1:1.75.

[0011] Furthermore, the slurry filling rate in the curtain grouting holes and the ordinary grouting holes is 90%, and the slurry stone formation rate is 80%.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. Through the grouting reinforcement of the curtain wall and the reinforcement area, especially the curtain wall forms a closed-loop structure outside the goaf area, effectively isolating the potential impact of the goaf on the underground foundation. At the same time, the ordinary grouting holes in the reinforcement area are evenly distributed, ensuring the overall reinforcement effect and improving the bearing capacity of the roadbed above the underground foundation.

[0014] 2. The design of the composite roadbed structure, including the reasonable combination of the road surface structure layer, roadbed layer, transition layer and rockfill layer. Especially, the roadbed layer uses small particle size stone, the transition layer is provided with an isolation layer and an earth-rock layer, and the rockfill layer uses large particle size stone. These measures work together to effectively disperse the stress borne by the roadbed and enhance the stability and durability of the roadbed.

[0015] 3. The geotextiles are set in the isolation layer of the transition layer of the composite roadbed, which not only helps to isolate different material layers, but also improves the drainage performance of the roadbed, preventing water infiltration from damaging the roadbed. At the same time, the setting of the curtain wall also plays a role in water isolation. Therefore, the composite roadbed and the curtain wall cooperate with each other to effectively prevent groundwater from eroding the goaf.

[0016] 4. The grouting reinforcement technology in the reinforcement area fills the cavities and cracks in the goaf area, reducing the risk of foundation settlement and deformation. And relatively small hole spacing and row spacing of grouting holes are adopted within the roadbed area to ensure the stability of the composite roadbed; relatively large hole spacing and row spacing of grouting reinforcement holes are adopted from the outside of the roadbed area to the curtain wall area, saving materials while ensuring strength.

[0017] 5. In summary, by adopting the overall structure combining the above-mentioned curtain wall, reinforcement area and composite subgrade for road construction, the problems that the slurry loss cannot effectively fill the mined-out area due to the unreasonable structure of the curtain and grouting holes, resulting in the instability of the subgrade above and the need for later repair or re-reinforcement are effectively solved, ensuring the stability of the composite subgrade structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front elevation sectional view of the curtain wall and the reinforcement area of the present invention;

[0019] Figure 2 It is a front elevation view of the composite subgrade of the present invention;

[0020] Figure 3 It is a partial overall plan view of the present invention;

[0021] In the figure: 1 - original ground line, 2 - bottom plate of the mined-out area, 100 - curtain wall, 110 - curtain grouting hole, 200 - reinforcement area, 210 - ordinary grouting hole, 300 - composite subgrade, 310 - road surface structure layer, 320 - roadbed layer, 330 - transition layer, 331 - isolation layer, 332 - earth and rock layer, 340 - rock filling layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Such as Figures 1-3As shown in the figure, the gob area grouting reinforcement construction composite roadbed 300 structure includes a curtain wall 100, a reinforcement area 200, and a composite roadbed 300. The curtain wall 100 includes a number of curtain grouting holes 110. The spacing between a number of the curtain grouting holes 110 is 8 - 10 m. They are arranged in rows on the outside of the gob area at 10 - 12 mm and form a closed-loop curtain wall 100. The reinforcement area 200 includes a number of ordinary grouting holes 210. The ordinary grouting holes 210 are evenly arranged in a plum blossom shape within the closed-loop curtain wall 100. The hole spacing is 15 - 18 m and the row spacing is 15 - 18 m within the roadbed area, and the hole spacing is 20 - 22 m and the row spacing is 25 - 28 m from the outside of the roadbed area to the curtain wall 100 area. The depths of the curtain grouting holes 110 and the ordinary grouting holes 210 are both from the original ground line 1 to 2 - 3 m below the gob area floor 2. The composite roadbed 300 is on the original ground line 1 above the curtain wall 100 and the reinforcement area 200. The composite roadbed includes a pavement structure layer 310, a roadbed layer 320, a transition layer 330, and a rockfill layer 340 arranged in sequence from top to bottom.

[0024] During the actual construction process, the spacing between a number of the curtain grouting holes 110 is 10 m. They are arranged in rows on the outside of the gob area at 10 m and form a closed-loop curtain wall 100. The hole spacing of the ordinary grouting holes 210 is 15 m and the row spacing is 15 m within the roadbed area, and the hole spacing is 20 m and the row spacing is 25 m from the outside of the roadbed area to the curtain wall 100 area. The depths of the curtain grouting holes 110 and the ordinary grouting holes 210 are both from the original ground line to 2 m below the gob area floor.

[0025] During the actual construction process, the roadbed layer 320 is filled with stones with a particle size < 10 cm. The stones with a smaller particle size can be arranged more closely during the filling process, reducing the porosity between the stones, improving the compactness of the roadbed, and making it easier to form an interlocking structure between the stones, increasing the overall stability of the roadbed.

[0026] During the actual construction process, the transition layer 330 is 40 cm thick and includes an isolation layer 331 and an earth-rock layer 332 from top to bottom. The isolation layer 331 is 20 cm thick and is provided with a geotextile. As a layer in the isolation layer 331, the geotextile can effectively intercept soil particles and prevent them from entering other layers below, while ensuring the normal flow of water, so it also has the functions of filtration and drainage. The earth-rock layer 332 is 20 cm thick and is filled with transported earth-rock with a particle size less than 150 mm. The earth-rock layer 332 can effectively transfer the load on the road to the lower part, thereby dispersing the load, reducing the local pressure on the composite roadbed 300, and preventing the settlement or deformation of the composite roadbed 300.

[0027] During the actual construction process, the filler used in the rockfill layer 340 is stones with a particle size of 200 mm to 500 mm. Because the mutual interlocking and frictional forces between the stones are large, it can effectively resist the deformation and displacement caused by external loads. Therefore, the use of the rockfill layer 340 can provide a higher bearing capacity. At the same time, under complex terrain conditions, the rockfill roadbed, due to its good water permeability and stability, can better adapt to the changes in geological conditions and reduce the risk of uneven settlement of the composite subgrade 300.

[0028] As Figure 3 shown, both sides of the composite subgrade 300 are slopes. Different ratios are set for the slope lines on both sides. According to the soil properties and stress conditions in different regions, a more reasonable slope can be designed to improve the overall stability of the subgrade. The slope line of the slope is divided into a first slope line and a second slope line from top to bottom. The ratio of the first slope line is 1:1.5. Such a steeper slope can reduce the earthwork volume and lower the project cost on the premise of ensuring sufficient stability; the ratio of the second slope line is 1:1.75, which is a relatively gentle slope compared to the first slope line, and can provide more support area for the subgrade and increase stability.

[0029] During the actual construction process, grouting can seal the aquifer and water-conducting channels, effectively reduce the inflow of groundwater, and prevent water permeability. The slurry filling rate in the curtain grouting holes 110 and the ordinary grouting holes 210 is 90%. Such a high slurry filling rate can reduce the risk of ground settlement and collapse.

[0030] At the same time, the designed slurry stone formation rate is 80%. The slurry stone formation rate refers to the ratio of the volume of the stone formed after the slurry solidifies to the volume of the original slurry, indicating that after the slurry solidifies, 80% of the volume can be converted into stones. This relatively high stone formation rate helps to ensure the quality and safety of the grouting project.

[0031] The pavement structure layer 310 of the composite subgrade provides a good driving surface and load dispersion ability; the roadbed layer 320 ensures the uniformity and density of the subgrade; the transition layer 330 plays multiple functions such as anti-seepage, filtration, reinforcement, and isolation; the rockfill layer 340 further enhances the bearing capacity and stability of the foundation. They cooperate with each other to form a complete, stable, and durable composite subgrade 300 structure system.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The composite roadbed structure is constructed by grouting reinforcement in goaf areas, which is characterized by: It includes a curtain wall, a reinforcement area and a composite roadbed. The curtain wall includes a plurality of curtain grouting holes. The hole spacing of the plurality of curtain grouting holes is 8 to 10 m. The plurality of curtain grouting holes are arranged in a row 10 to 12 m outside the goaf in a closed loop to form a curtain wall. The reinforcement area includes a plurality of common grouting holes. The common grouting holes are located in the closed loop curtain wall and are evenly arranged in a plum blossom shape. The hole spacing and row spacing within the roadbed area are 15 to 18 m and 15 to 18 m, and the hole spacing and row spacing from the roadbed area to the curtain wall area are 20 to 22 m and 25 to 28 m, respectively. The depths of the curtain grouting holes and the common grouting holes are both from the original ground line to 2 to 3 m below the bottom plate of the goaf. The roadbed is located on the original ground line above the curtain wall and the reinforcement area. The composite roadbed includes a pavement structure layer, a roadbed layer, a transition layer and a stone filling layer arranged in sequence from top to bottom.

2. The composite roadbed structure for goaf grouting reinforcement construction according to claim 1 is characterized in that: The spacing between several of the curtain grouting holes is 10m, and they are arranged in a row 10m outside the goaf in a closed loop to form a curtain wall; the common grouting holes have a hole spacing of 15m and a row spacing of 15m within the roadbed area, and a hole spacing of 20m and a row spacing of 25m from outside the roadbed area to the curtain wall area. The depth of the curtain grouting holes and the common grouting holes are both from the original ground line to 2m below the bottom plate of the goaf.

3. The composite roadbed structure for goaf grouting reinforcement construction according to claim 1 is characterized in that: The roadbed layer is filled with stones with a filler particle size of less than 10 cm.

4. The composite roadbed structure for goaf grouting reinforcement construction according to claim 3 is characterized in that: The transition layer is 40 cm long and includes an isolation layer and an earth and stone layer from top to bottom. The isolation layer is 20 cm long and is provided with geotextile. The earth and stone layer is 20 cm long and is filled with transported earth and stone with a particle size less than 150 mm.

5. The composite roadbed structure for goaf grouting reinforcement construction according to claim 4 is characterized in that: The rock filling layer is filled with rocks with a filler particle size of 200 mm to 500 mm.

6. The composite roadbed structure for goaf grouting reinforcement construction according to claim 1 is characterized in that: Both sides of the composite roadbed are slopes, and the slope lines of the slopes are divided into a first slope line and a second slope line from top to bottom, and the ratio of the first slope line is 1:1.5; the ratio of the second slope line is 1:1.

75.

7. The composite roadbed structure for goaf grouting reinforcement construction according to claim 1 is characterized in that: The slurry filling rate in the curtain grouting hole and the common grouting hole is 90%, and the slurry stone rate is 80%.

Images