A method for controlling floor heave by deeply excavating the roadway floor and filling it with crushed stones

Abstract

The present invention belongs to the technical field of coal mine roadway floor heave management and prevention, and provides a roadway floor heave management method using deep excavation and gravel filling, comprising the following steps: S1. Deep excavation of the excavated roadway floor to form a deep excavation section, which is then waterproofed; S2. Anchoring the two opposing sidewalls of the deep excavation section; S3. Secondarily crushing gravel and excavation waste rock and filling the deep excavation section, smoothing the surface of the gravel to form a gravel filling body; S4. Laying prefabricated blocks and connecting them to form a roadway floor heave management system using deep excavation and gravel filling; S5. When floor heave first occurs, the prefabricated blocks in the floor heave area are removed, the escaping gravel is shoveled away, the shoveled area is smoothed again, and the prefabricated blocks are repositioned and connected to complete the repair. The present invention utilizes solid waste such as waste rock to solve the problem that existing floor heave management technologies cannot effectively manage roadway floor heave in the long term.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine roadway floor heave control and prevention, and in particular relates to a method for controlling floor heave of a roadway floor filled with deep excavation gravel. Background Art

[0002] Coal's status as my country's primary energy source remains unchanged for years to come. However, with the continued increase in coal production in recent years, shallow coal resources have been gradually depleted, and coal mining has gradually shifted to deeper mining. However, one of the greatest challenges facing deep mining is roadway floor heave. Because floor heave impacts normal transportation and traffic, it inevitably requires significant manpower, material resources, and time to address it. In severe cases, it can even render an entire roadway useless, severely impacting normal mine operations and the safety of underground personnel. Therefore, effectively addressing the impact of roadway floor heave has become a critical issue that urgently needs to be addressed.

[0003] On the other hand, coal mining inevitably generates coal-based solid waste. With the continued rise in coal production, the output of coal-based solid waste has also shown an upward trend year by year. Gangue, one of the most important coal-based solid wastes, will produce 829 million tons annually in 2023. Gangue is typically disposed of by piling it up within mining areas to form gangue heaps. This approach not only consumes significant land resources but also creates environmental problems such as spontaneous combustion and heavy metal pollution. Therefore, the effective disposal of coal-based solid wastes, such as gangue, is another key issue that urgently needs to be addressed. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for treating floor drums in deep excavation of tunnel floor with gravel filling, so as to solve the above problems and achieve the purpose of using solid waste such as gangue to solve the problem that existing floor drum treatment technology cannot effectively treat tunnel floor drums for a long time and requires time-consuming and labor-intensive repairs.

[0005] To achieve the above object, the present invention provides the following solution: a method for treating floor heave in a roadway floor deep excavation with gravel filling, comprising the following steps:

[0006] S1. During tunnel excavation, deep excavation is performed on the tunnel floor to form a deep excavation section. After the deep excavation is completed, waterproofing is performed on the floor of the deep excavation section.

[0007] S2. Anchor rods are driven into the two opposite side walls of the deep excavation section for anchor support;

[0008] S3, crushing the gravel and gangue produced by deep excavation and filling them into the deep excavation part, and finally smoothing the surface of the gravel to form a gravel filling body;

[0009] S4. Laying prefabricated blocks on the surface of the gravel filling body and connecting the prefabricated blocks to form a floor heave control system for deep excavation and gravel filling of the roadway floor;

[0010] S5. When the floor drum first occurs, the prefabricated blocks in the floor drum area are removed, the rubble that has emerged from the floor drum area is shoveled away, and the filling material in the shoveled area is leveled again. The removed prefabricated blocks are returned to their original positions and connected to complete the repair work.

[0011] S6. When the bass drum occurs again, repeat step S5.

[0012] Preferably, in step S2, the anchor rod driving depth is between 0.6m and 1.2m, the anchor rod row spacing is between 1.0m and 1.2m, and the spacing is between 0.8m and 1.0m.

[0013] Preferably, in step S3, the secondary crushed gravel and tunneling waste rock are compacted every 0.3m to 0.8m during filling until the filling is completed;

[0014] After each compaction is completed, a layer of waterproof material needs to be sprayed on the surface of the compacted filling body until the filling is completed.

[0015] Preferably, in S4, two adjacent prefabricated building blocks are detachably connected via a quick-release member;

[0016] The prefabricated building blocks include axisymmetric large-shaped building blocks and non-axisymmetric R-shaped building blocks. The large-shaped building blocks are located in the middle of the gravel filling body, and the R-shaped building blocks are located at the edge of the gravel filling body.

[0017] Preferably, the prefabricated blocks are made of coal gangue, fly ash, 42.5 ordinary Portland cement, alkali slag and water, which are mixed and injected into corresponding molds, and then demoulded after waiting for a certain age.

[0018] Preferably, the width of the prefabricated building block is calculated according to the following formula:

[0019]

[0020] Where Y is the mold width, L is the roadway floor width, It is the total length of the gap between precast blocks.

[0021] Preferably, the four groups of edges of the large-shaped building blocks and the three groups of edges of the R-shaped building blocks are respectively provided with protrusions or slots;

[0022] Between two adjacent large-shaped building blocks, the protrusion on one large-shaped building block is adapted to the slot on the other large-shaped building block;

[0023] Between two adjacent R-shaped building blocks, the protrusion on one R-shaped building block is adapted to the slot on the other R-shaped building block;

[0024] Between two adjacent large-shaped building blocks and R-shaped building blocks, the protrusions on the R-shaped building blocks are matched with the slots on the large-shaped building blocks.

[0025] Preferably, the quick-release member includes a steel column, a first through-hole horizontally provided on the protrusion, and second through-holes horizontally provided on two opposite side walls of the slot; after the protrusion is inserted into the slot, the first through-hole coincides with the second through-hole, and the steel column horizontally passes through the first through-hole and the second through-hole;

[0026] The two ends of the steel column are respectively provided with connecting ears and connecting grooves, and the connecting ears and connecting grooves are respectively provided with perforations. Along the axial direction of the steel column, between two adjacent steel columns, the connecting ear of one steel column is inserted into the connecting groove of the other steel column, and the perforations on the connecting ears coincide with the perforations on the connecting grooves. A steel bolt is also included, which is detachably connected to the perforations.

[0027] Preferably, a gap is reserved between two adjacent prefabricated building blocks to facilitate installation and disassembly of the prefabricated building blocks.

[0028] Compared with the prior art, the present invention has the following advantages and technical effects: the method for controlling bottom drum of deep excavation gravel filling in tunnel floor proposed by the present invention firstly performs deep excavation on the tunnel floor, then performs waterproof pretreatment on the deep excavation floor, and then anchors the two side walls of the tunnel in the deep excavation part for support, and then fills the deep excavation part with the deep excavation gravel and tunneling waste rock after secondary crushing, and compacts the gravel filling body as much as possible and keeps the surface flat after filling, and then splices the prefabricated blocks to the surface of the tunnel filling body and connects them with steel columns and steel bolts to form a bottom drum control system of deep excavation gravel filling in tunnel floor, and when bottom drum occurs again, the prefabricated blocks in the bottom drum area will be taken out, and the gravel gushing out in the bottom drum area will be shoveled away, and finally the surface of the filling body will be compacted and leveled, and the prefabricated solid waste-rebar blocks originally taken out will be put back in place to complete the control of tunnel bottom drum. Compared with traditional bottom drum treatment methods, this method has a simpler construction process and a more sustainable treatment effect. It also takes into account the environmental and social benefits and makes relevant applications of coal-based solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic diagram of the buried depth of the tunnel;

[0031] Figure 2 It is a schematic diagram of large-shaped blocks and R-shaped blocks;

[0032] Figure 3 This is a schematic diagram of the deep excavation part of the tunnel;

[0033] Figure 4 This is a schematic diagram of bolt support on two opposite side walls of the deep excavation section of the tunnel;

[0034] Figure 5 This is a schematic diagram of the gravel filling body of the deep excavation part of the tunnel;

[0035] Figure 6 This is a top view of the bottom plate and bottom drum after treatment is completed;

[0036] Figure 7 for Figure 6 aa section diagram in;

[0037] Figure 8 for Figure 6 bb cross-section in;

[0038] Figure 9 A schematic cross-sectional view of the connection between several prefabricated building blocks of the present invention;

[0039] Figure 10 This is a diagram of the floor heave treatment system for deep excavation and gravel filling of the roadway floor according to the present invention;

[0040] Figure 11 This is a diagram of the regional device disassembly when the bass drum occurs again;

[0041] Figure 12 for Figure 9 Partial enlarged view of B in FIG;

[0042] Among them, 1. Tunnel; 2. Surrounding rock; 3. Deep excavation part; 4. Anchor rod; 5. Gravel filling body; 6. Precast blocks; 7. Steel columns; 8. Steel bolts; 9. Large blocks; 10. R-shaped blocks; 12. Perforations; 13. Protrusions; 14. Slots; 15. Connecting ears; 16. Connecting grooves; 17. Rebars. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Reference Figures 1-12 The present invention provides a method for treating floor heave in a roadway floor deep excavation with gravel filling, comprising the following steps:

[0046] S1. During tunneling of the tunnel 1, deep excavation is performed on the floor of the tunnel 1 to form a deep excavation section 3. After the deep excavation is completed, waterproofing is performed on the floor of the deep excavation section 3.

[0047] After the deep excavation is completed, the bottom plate of the deep excavation part 3 is promptly coated / sprayed with waterproof material to achieve a waterproof treatment effect. The waterproof material can be polyurethane material for coal mine water blocking.

[0048] S2, driving anchor rods 4 into two opposite side walls of the deep excavation part 3 for anchor support;

[0049] After the waterproof material sprayed in step S1 has been cured for a sufficient period of time, anchor rod support is performed on the two opposite side walls of the deep excavation portion 3, that is, the two sides of the deep excavation portion 3.

[0050] S3, crushing the gravel and gangue produced by deep excavation and filling them into the deep excavation part 3, and finally smoothing the surface of the gravel to form a gravel filling body 5;

[0051] In this step, the crushed stones and tunneling waste rock produced by deep excavation can be crushed for the second time by a crusher underground and then filled into the deep excavation part 3.

[0052] S4, laying prefabricated blocks 6 on the surface of the gravel filling body 5, and connecting the prefabricated blocks 6 to form a floor heave control system for deep excavation and gravel filling of the roadway floor;

[0053] S5. When the bottom drum occurs for the first time, the prefabricated building blocks 6 in the bottom drum area are removed, the rubble that has emerged from the bottom drum area is shoveled away, and the filling body in the shoveled area is leveled again. The removed prefabricated building blocks 6 are returned to their original positions and connected to complete the repair work;

[0054] S6. When the bass drum occurs again, repeat step S5.

[0055] On the whole, in the present invention, the tunnel floor is first deep-excavated, and then the deep-excavated floor is pre-treated for waterproofing. Secondly, anchor rods are driven on both sides of the deep-excavated part of the tunnel for support. Then, the deep-excavated gravel and tunneling waste rock are crushed for the second time and filled into the deep-excavated part. The gravel filling body is compacted as much as possible and the surface after filling is kept flat. Then, the prefabricated blocks are spliced to the surface of the tunnel filling body and connected with steel columns and steel bolts to form a bottom drum control system for the deep-excavated gravel filling of the tunnel floor.

[0056] When the bottom slab bulges again, the crushed stone filling body can play a certain buffering role. After the bottom bulge develops again, that is, the bottom bulge continues to develop and the crushed stone filling body is not enough to buffer, the steel bolts between the steel columns in the bottom bulge area are removed, the prefabricated blocks are removed, and some of the crushed stones that have surged out due to the impact of the bottom bulge are manually shoveled away. After the surged gravel is shoveled away, the surface of the filling body after shoveling is compacted and leveled.

[0057] The prefabricated blocks are then repositioned, installed using steel columns, and reinserted with steel bolts, completing the reconstruction of the deep excavation gravel filling system for the tunnel floor. If the floor heave area subsequently develops (i.e., the floor heave continues to develop) or a new floor heave occurs, the above steps can be repeated. This treatment process does not require the use of large-scale machinery and is convenient, fast, and cost-effective. Compared to traditional floor heave treatment methods, this method offers a simpler construction process and more sustainable treatment results. It also takes into account both environmental and social benefits, making relevant use of coal-based solid waste.

[0058] Further optimization scheme, such as Figure 1 As shown, in step S1, the excavation depth E of the deep excavation part 3 depends on the coal seam burial depth H. The deeper the coal seam burial depth, the greater the excavation depth of the bottom plate of the tunnel 1, that is, the deeper the excavation depth of the deep excavation part 3. The specific excavation depths are shown in Table 1 below.

[0059]

[0060] In this embodiment, the coal seam depth H is 600 m and the roadway floor width L is 5.2 m. On this basis, the depth E of the deep excavation portion 3 is determined to be 2.2 m.

[0061] To further optimize the solution, in step S2, the driving depth of the anchor rod 4 is between 0.6m and 1.2m, the row spacing A of the anchor rod 4 is between 1.0m and 2m, the first anchor rod is driven at 0.8m from the original tunnel bottom plate, and the anchor rod spacing W is between 0.8m and 1.0m. If the minimum spacing value is not reached, the next anchor rod will not be driven.

[0062] According to a further optimized solution, in step S2, the driving depth of the anchor rods 4 is between 0.6m and 1.2m, the row spacing A of the anchor rods 4 is between 1.0m and 2m, and the spacing W is between 0.8m and 1.0m.

[0063] In this embodiment, the driving depth of the anchor rods 4 is 0.8 m, the anchor rod spacing A is 1 m, and the spacing is 1 m.

[0064] like Figure 4 As shown, the row spacing A is the horizontal distance between the axes of two adjacent anchor rods 4, and the spacing W is the longitudinal distance between the axes of two adjacent anchor rods 4.

[0065] To further optimize the solution, in step S3, the secondary crushed gravel and tunneling waste rock are compacted every 0.3m to 0.8m of filling until the filling is completed; in this embodiment, compaction can be performed every 0.5m of filling.

[0066] After each compaction is completed, a layer of waterproof material needs to be sprayed on the surface of the compacted filling body until the filling is completed.

[0067] Specifically, in this embodiment, Figure 5 As shown, when the filling reaches 1.7m away from the original bottom plate of tunnel 1, the polyurethane material for coal mine water blocking is sprayed and waited for 2 minutes. Then, the gravel is continued to be filled to 1.2m away from the original tunnel bottom plate, and the polyurethane material for coal mine water blocking is sprayed and waited for 2 minutes. That is, the above filling-spraying-waiting process is repeated every 0.5m until the gravel filling is completed. After completion, the surface of the gravel filling body is leveled to pave the way for subsequent construction.

[0068] Further optimizing the solution, in S4, two adjacent prefabricated blocks 6 are detachably connected via a quick-release member;

[0069] The prefabricated blocks 6 include axisymmetric large blocks 9 and non-axisymmetric R-shaped blocks 10 . The large blocks 9 are located in the middle of the gravel filling body 5 , and the R-shaped blocks 10 are located at the edge of the gravel filling body 5 .

[0070] To further optimize the solution, prefabricated blocks 6 are made of coal gangue, fly ash, 42.5 ordinary Portland cement, alkali slag and water, which are mixed in a ratio of 10:3:7:6:5 and then injected into the corresponding mold, and demolded after waiting for the age.

[0071] The large-shaped blocks 9 and R-shaped blocks 10 adopt a solid waste-rebar mixed structure. Specifically, a mold is made according to the shape of the large-shaped blocks 9 and R-shaped blocks 10, and a mixture consisting of coal gangue, fly ash, 42.5 ordinary Portland cement, alkali slag and water is poured into the mold. During the pouring process, a layer of φ0.02m steel bars 17 is laid in the mold, three in each direction. Figure 9As shown, after waiting until the age, the blocks are demoulded to form prefabricated blocks 6 of corresponding shapes.

[0072] To further optimize the solution, the prefabricated blocks 6 are mass-produced using the above-mentioned molds before the tunnel floor heave treatment construction and must be ensured to have been cured for a certain period of time.

[0073] Further optimizing the solution, the thickness Z of the prefabricated building block 6 is 0.06m, the length X is 1m, and the width of the prefabricated building block 6 is calculated according to the following formula:

[0074]

[0075] Where Y is the mold width, L is the roadway floor width, The total length of the gap between precast blocks is 0.24m.

[0076] Specifically, such as Figure 2 As shown, in this embodiment, the width L of the bottom plate of the tunnel 1 is 5.2m, and the width Y of the prefabricated building block 6 is 1.65m.

[0077] According to a further optimized solution, the four groups of edges of the large-shaped building block 9 and the three groups of edges of the R-shaped building block 10 are respectively provided with protrusions 13 or slots 14;

[0078] Between two adjacent large-shaped building blocks 9, the protrusion 13 on one large-shaped building block 9 is adapted to the slot 14 on the other large-shaped building block 9;

[0079] Between two adjacent R-shaped blocks 10 , the protrusion 13 on one R-shaped block 10 fits into the slot 14 on the other R-shaped block 10 ;

[0080] Between two adjacent large-shaped building blocks 9 and R-shaped building blocks 10 , the protrusions 13 on the R-shaped building blocks 10 are adapted to the slots 14 on the large-shaped building blocks 9 .

[0081] like Figure 6 As shown, in this embodiment, three groups of prefabricated blocks 6 are laid along the width of the surface of the gravel filling body 5. Specifically, a large block 9 is located in the middle, with R-shaped blocks 10 laid on either side. Three groups of the edges of the large block 9 each have inwardly facing slots 14, and the fourth group of edges is fixed with a protrusion 13. Simultaneously, two adjacent edges of the R-shaped block 10 are fixed with protrusions 13, and one side has an inwardly facing slot 14, ensuring the interconnection between the large block 9 and the R-shaped block 10.

[0082] A further optimized solution is that the quick-release part includes a steel column 7, a first through-hole horizontally provided on the protrusion 13, and a second through-hole horizontally provided on two opposite side walls of the slot 14. After the protrusion 13 is inserted into the slot 14, the first through-hole coincides with the second through-hole, and the steel column 7 horizontally passes through the first through-hole and the second through-hole.

[0083] The steel column 7 is provided with a connecting ear piece 15 and a connecting groove 16 at both ends respectively. The connecting ear piece 15 and the connecting groove 16 are respectively provided with a through-hole 12. Along the axial direction of the steel column 7, between two adjacent steel columns 7, the connecting ear piece of one steel column 7 is inserted into the connecting groove 16 of the other steel column 7, and the through-hole 12 on the connecting ear piece 15 coincides with the through-hole 12 on the connecting groove 16. A steel bolt 8 is also included, which is detachably connected to the through-hole 12.

[0084] According to a further optimized solution, the connection ears 15 and the connection grooves 16 at both ends of the steel column 7 are oriented in the same direction.

[0085] like Figure 6-Figure 9 As shown, first, along the extension direction of the tunnel 1, the protrusions 13 on the front and rear precast blocks 6 are inserted into the slots 14, and then the steel columns 7 are inserted into the first and second perforations to form a connection. At the same time, it is necessary to ensure that the connecting grooves 16 of the steel columns 7 are arranged vertically. After that, two adjacent precast blocks 6 are connected along the width direction of the tunnel 1. For example, when connecting the large block 9 in the middle with the R-shaped block 10 on the right, the large block 9 is lowered so that the connecting tabs 15 of the steel columns 7 on it are vertically inserted into the connecting grooves 16 of the steel columns 7 on the R-shaped block 10, and the perforations 12 are overlapped. Then, the steel bolts 8 are horizontally inserted into the perforations 12 and tightened between the two steel columns 7 using nuts to form a whole.

[0086] When bottom drum occurs, the adjacent prefabricated building blocks 6 can be separated by removing the steel bolts 8, and the prefabricated building blocks 6 in the bottom drum area can be easily taken out.

[0087] To further optimize the solution, a gap of 0.06 m is reserved between two adjacent prefabricated blocks 6 to facilitate the installation and disassembly of the prefabricated blocks 6.

[0088] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0089] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for treating floor heave in deep excavation and gravel filling of roadway floor, characterized in that , including the following steps: S1. When the tunnel (1) is being excavated, a deep excavation operation is performed on the bottom plate of the tunnel (1) to form a deep excavation portion (3). After the deep excavation is completed, a waterproofing treatment is performed on the bottom plate of the deep excavation portion (3); S2, driving anchor rods (4) into two opposite side walls of the deep excavation part (3) for anchor support; S3, crushing the gravel produced by deep excavation and the excavation waste rock for the second time and filling it into the deep excavation part (3), and finally smoothing the surface of the gravel to form a gravel filling body (5); S4, laying the prefabricated blocks (6) on the surface of the gravel filling body (5), and connecting the prefabricated blocks (6) to form a floor drum control system for deep excavation gravel filling of the roadway floor; S5. When the bottom drum first occurs, the prefabricated blocks (6) in the bottom drum area are removed, the rubble that has emerged from the bottom drum area is shoveled away, and the filling body in the shoveled area is leveled again. The removed prefabricated blocks (6) are returned to their original positions and connected to complete the repair work; S6. When the bass drum occurs again, repeat step S5; In said S4, two adjacent prefabricated building blocks (6) are detachably connected via a quick-release member; The prefabricated building blocks (6) include axisymmetric large-shaped building blocks (9) and non-axisymmetric R-shaped building blocks (10), wherein the large-shaped building blocks (9) are located in the middle of the gravel filling body (5), and the R-shaped building blocks (10) are located at the edge of the gravel filling body (5); The four groups of edges of the large-shaped building block (9) and the three groups of edges of the R-shaped building block (10) are respectively provided with protrusions (13) or slots (14); The quick-release part comprises a steel column (7), a first through-hole horizontally provided on the protrusion (13), and a second through-hole horizontally provided on two opposite side walls of the slot (14); after the protrusion (13) is inserted into the slot (14), the first through-hole and the second through-hole coincide with each other, and the steel column (7) horizontally passes through the first through-hole and the second through-hole; The two ends of the steel column (7) are respectively provided with a connecting ear piece (15) and a connecting groove (16), and the connecting ear piece (15) and the connecting groove (16) are respectively provided with a perforation (12). Along the axial direction of the steel column (7), between two adjacent steel columns (7), the connecting ear piece of one steel column (7) is inserted into the connecting groove (16) of the other steel column (7), and the perforation (12) on the connecting ear piece (15) coincides with the perforation (12) on the connecting groove (16). The steel bolt (8) is also included, and the steel bolt (8) is detachably connected to the perforation (12).

2. The method for treating floor heave in deep excavation and gravel filling of a roadway floor according to claim 1, characterized in that: In step S2, the anchor rods (4) are driven into the depth between 0.6m and 1.2m, the row spacing of the anchor rods (4) is between 1.0m and 1.2m, and the spacing is between 0.8m and 1.0m.

3. The method for treating floor heave in deep excavation and gravel filling of a roadway floor according to claim 1, characterized in that: In step S3, the secondary crushed gravel and tunneling waste rock are compacted every 0.3m to 0.8m until the filling is complete; After each compaction is completed, a layer of waterproof material needs to be sprayed on the surface of the compacted filling body until the filling is completed.

4. The method for treating floor heave in deep excavation and gravel filling of a roadway floor according to claim 1, characterized in that: The prefabricated blocks (6) are prepared by mixing coal gangue, fly ash, 42.5 ordinary Portland cement, alkali slag and water, injecting the mixture into a corresponding mold, and demoulding after waiting until the age.

5. The method for treating floor heave in deep excavation and gravel filling of a roadway floor according to claim 1, characterized in that: The width of the prefabricated building block (6) is calculated according to the following formula: Where Y is the mold width, L is the roadway floor width, It is the total length of the gap between precast blocks.

6. The method for treating floor heave in deep excavation and gravel filling of a roadway floor according to claim 1, characterized in that: Between two adjacent large-shaped building blocks (9), the protrusion (13) on one large-shaped building block (9) is adapted to the slot (14) on the other large-shaped building block (9); Between two adjacent R-shaped building blocks (10), the protrusion (13) on one R-shaped building block (10) is adapted to the slot (14) on the other R-shaped building block (10); Between two adjacent large-shaped building blocks (9) and R-shaped building blocks (10), the protrusions (13) on the R-shaped building blocks (10) are adapted to the slots (14) on the large-shaped building blocks (9).

7. The method for treating floor heave in deep excavation of a roadway floor filled with gravel according to claim 1, characterized in that: A gap is reserved between two adjacent prefabricated building blocks (6) to facilitate installation and removal of the prefabricated building blocks (6).

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