A composite sealing structure and method for grout-proof filling retaining walls

Abstract

This invention discloses a composite sealing structure and method for a grout-proof filling retaining wall, belonging to the engineering technology fields of mining filling and extraction, tunnel construction, and underground space utilization. From the surface of the rock mass to be sealed towards the interior of the retaining wall, the structure comprises: an inner flexible sealing layer, a non-woven fabric layer laid on the rock mass surface; a main retaining wall structure, a wall built upon the inner flexible sealing layer; a gap-filling layer, a non-woven fabric layer filling the gap between the main retaining wall structure and the rock mass; and an outer rigid sealing layer, a cement mortar or polymer sealant layer sealing the gap between the main retaining wall structure and the non-woven fabric layer. Through a dual mechanism combining "flexible filling filtration" and "rigid sealing," it can adapt to irregular gaps of any shape. The non-woven fabric layer forms an effective capillary barrier, allowing water vapor to pass through but blocking solid particles in the grout, thus forming a "self-dense" filter cake layer.

Description

Technical Field

[0001] This invention belongs to the field of engineering technology such as mining backfilling, tunnel construction and underground space utilization, specifically a composite sealing structure and method for a backfilling retaining wall to prevent grout leakage. Background Technology

[0002] In mining backfilling, tunnel construction, and underground space utilization projects, backfill retaining walls are critical temporary or permanent structures used to contain backfill materials and isolate working spaces. Current technologies often employ brick masonry, cast-in-place concrete, or precast panel assembly methods for retaining walls. When these rigid or semi-rigid retaining walls come into contact with irregular rock masses or tunnel walls, they inevitably create gaps of varying shapes. During backfilling operations, high-pressure fluid slurry leaks significantly along these gaps, leading to the following serious problems:

[0003] 1. Material waste and increased costs: Grout loss directly leads to waste of filling materials. According to statistics, the losses caused by grout leakage can account for more than 10% of the total material cost.

[0004] 2. Environmental pollution: The leaked slurry may contain cement, chemical additives and other components, which may pollute the groundwater system and the surrounding soil.

[0005] 3. Safety hazards: Grout leakage may lead to incomplete filling and insufficient strength, affecting the safety and stability of the mining area or the superstructure; at the same time, high-pressure grout splashing also poses a safety threat to on-site construction personnel.

[0006] 4. Low construction efficiency: In order to deal with grout leakage, additional leak-sealing measures are often required, which prolongs the construction period and increases labor costs.

[0007] While existing technologies attempt to mitigate grout leakage by optimizing grout ratios and surface sealing at joints, their effectiveness is limited. The fundamental reason is that traditional sealing methods struggle to adapt to the complex shapes of joints and the dynamic pressure changes during filling, resulting in insufficient reliability and durability of the seal. Therefore, the market urgently needs a grout leakage prevention technology that can fundamentally solve the problem of sealing joints between retaining walls and rock masses, and is simple, economical, and reliable to implement. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention, which adopts the following technical solution:

[0009] A composite sealing structure for a grout-proof filling retaining wall, comprising, from the surface of the rock mass to be sealed to the interior of the retaining wall, the following components in sequence:

[0010] The inner flexible sealing layer is a non-woven fabric laid on the surface of the rock mass.

[0011] The main structure of the retaining wall is a wall built on top of an inner flexible sealing layer;

[0012] The gap filling layer is a non-woven fabric used to fill the gap between the main structure of the retaining wall and the rock mass.

[0013] The outer rigid sealing layer is a cement mortar or polymer sealant layer that seals the gap between the main structure of the retaining wall and the non-woven fabric.

[0014] In a preferred embodiment, the main structure of the retaining wall includes an inner retaining wall and an outer retaining wall, with a gap reserved between the inner and outer retaining walls. An airbag is installed in the gap, and a filling pressure body is independently installed on the side of the airbag facing the rock surface.

[0015] In a preferred embodiment, a corner plate is installed in the gap between the inner and outer retaining walls, and a support plate is installed on the corner plate. The support plate is used to install the airbag body and has perforations.

[0016] In a preferred embodiment, the filling and pressurizing body comprises:

[0017] The flexible body is located on the side of the airbag body facing away from the support plate, and a column is installed inside. Both ends of the column are equipped with unidirectional moving parts for moving only towards the rock mass.

[0018] The filler, positioned outwards in a V-shape on the side of the flexible body opposite the airbag, is used to compress the gap filling layer and simultaneously seal the gap between the main structure of the retaining wall and the rock mass.

[0019] In a preferred embodiment, both the inner and outer retaining walls have storage openings in their middle sections;

[0020] A sealing component one is installed inside the storage opening of the inner retaining wall, and a sealing component two is installed inside the storage opening of the outer retaining wall;

[0021] Both sealing component one and sealing component two are T-shaped structures;

[0022] The two sealing components are connected by a connecting structure.

[0023] The connection structure includes a connecting post mounted on the first sealing component and a connecting body mounted on the second sealing component. The connecting body is used to be threadedly connected to the connecting post.

[0024] In a preferred embodiment, sealing bodies are provided on the outer sides of the first and second sealing components to seal the gap between the retaining wall and the sealing components.

[0025] In a preferred embodiment, the interior of the sealing body is provided with an elastic tearing body, which divides the interior of the sealing body into two compartments. Both compartments one and two are provided with a one-way diaphragm and a scraper. The elastic tearing body is provided with tearing structures corresponding to the positions of the scraper.

[0026] The sealing body is provided with a fixing body one and a fixing body two. The fixing body one is installed on the corresponding retaining wall body, and the fixing body two is used to be installed on the corresponding sealing part two.

[0027] In a preferred embodiment, the unidirectional diaphragm includes two diaphragm structures connected by electrostatic force, and the side of the sealing body is provided with a slot for installing the unidirectional diaphragm and a plug is installed in the slot.

[0028] A construction method for a grout-proof filling retaining wall composite sealing structure, comprising the following steps:

[0029] Step 1: Surface preparation and material preparation

[0030] Clean the surface of the rock mass at the location where the retaining wall will be built, removing loose stones, debris and dirt;

[0031] Prepare sealing materials, one of which is non-woven fabric, which is polypropylene non-woven fabric with a unit area mass of 200-600g / m² and a thickness of 0.5-2mm.

[0032] The sealing material is cement mortar with a strength grade of not less than M10, or modified silane sealant;

[0033] Step 2: Laying the inner flexible sealing layer

[0034] Lay the cut non-woven fabric completely onto the cleaned rock surface, with the edges extending at least 10cm beyond the design outline of the retaining wall.

[0035] Step 3: Construct the main structure of the retaining wall

[0036] On top of the laid nonwoven fabric, construct the main structure of the retaining wall according to the design requirements;

[0037] Step 4: Fill the gaps

[0038] The non-woven fabric is folded or rolled up and then tightly stuffed into the gap between the main structure of the retaining wall and the rock mass on both sides of the retaining wall main structure using an awl or similar object, with a stuffing depth of not less than 5cm.

[0039] Step 5: Apply the outer rigid sealing layer

[0040] Use cement mortar or modified silane sealant to seal the outer opening of the gap in the main body of the retaining wall, forming an outer rigid sealing layer. The outer rigid sealing layer covers the outside of the gap filling layer, forming an integral sealing strip. The sealing strip covers the wall column structure by at least 1cm, with a width of not less than 8cm and a thickness of not less than 8mm.

[0041] Step Six: Maintenance and Inspection

[0042] After the outer rigid sealing layer 4 reaches its initial strength, the filling operation will be carried out.

[0043] A construction method for a grout-proof filling retaining wall composite sealing structure, comprising the following steps:

[0044] Step 1: Surface preparation and material preparation

[0045] Clean the surface of the rock mass at the location where the retaining wall will be built, removing loose stones, debris and dirt;

[0046] Prepare sealing materials, one of which is non-woven fabric, which is polypropylene non-woven fabric with a unit area mass of 200-600g / m² and a thickness of 0.5-2mm.

[0047] The sealing material is cement mortar with a strength grade of not less than M10, or modified silane sealant;

[0048] Step 2, Lay the inner flexible sealing layer

[0049] Lay the cut non-woven fabric completely onto the cleaned rock surface, with the edges extending at least 10cm beyond the design outline of the retaining wall.

[0050] Step 3: Construct the main structure of the retaining wall

[0051] On the laid nonwoven fabric, construct the inner retaining wall and the outer retaining wall according to the design requirements. In the gap reserved between the inner retaining wall and the outer retaining wall, install the filling pressure body, the airbag body, the support plate and the corner plate in sequence.

[0052] Step 4, fill the gaps

[0053] The non-woven fabric is folded or rolled up and then tightly stuffed into the gap between the inner and outer retaining walls and the rock mass using an awl or similar object, ensuring full filling, and the non-woven fabric exposed in the gap between the inner and outer retaining walls is not less than 5 cm.

[0054] Inflate the airbag, and the filling pressure body will press the non-woven fabric exposed in the gap between the inner and outer retaining walls tightly, while itself sealing the joint between the gap and the rock surface.

[0055] Step 5, wall sealing

[0056] The sealing component is inserted into the inner retaining wall from the inside out, and the sealing body completes the seal between the two.

[0057] The second sealing component is inserted into the outer retaining wall from the inside out, and the sealing body completes the sealing of the two components.

[0058] The two sealing components are connected by a connecting structure to form a structural whole.

[0059] Step 6, Apply the outer rigid sealing layer

[0060] Use cement mortar or modified silane sealant to seal the outer opening of the gap in the main body of the retaining wall, forming an outer rigid sealing layer. The outer rigid sealing layer covers the outside of the gap filling layer, forming an integral sealing strip. The sealing strip covers the wall column structure by at least 1cm, with a width of not less than 8cm and a thickness of not less than 8mm.

[0061] Step 7, Maintenance and Inspection

[0062] After the outer rigid sealing layer reaches its initial strength, the filling operation will be carried out.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] 1. This invention utilizes a dual mechanism combining "flexible filling filtration" and "rigid sealing" to adapt to irregular gaps of any shape. The non-woven fabric layer forms an effective capillary barrier, allowing water vapor to pass through while blocking solid particles in the slurry, thus creating a "self-dense" filter cake layer. Field tests have shown that this method can achieve a gap sealing rate of over 97%, reducing the slurry leakage rate from 5-10% in traditional methods to below 0.3%.

[0065] 2. This method is simple in process, requires low technical skills from workers, and does not require complex equipment. Compared with the traditional process of sealing the surface after building the wall, this method integrates sealing with the wall construction, which can shorten the construction period by about 25%.

[0066] 3. Although this invention increases the cost of nonwoven fabric, it can reduce the total project cost by about 18% due to the significant reduction in slurry waste (the cost of saving slurry is far greater than the cost of fabric) and the reduction in maintenance costs for subsequent leak sealing.

[0067] 4. The flexible non-woven fabric used in this invention can perfectly conform to irregular rock surfaces, solving the adaptation problem of rigid retaining walls. This composite structure has good toughness, can absorb some of the impact and pressure from the filling material, and can withstand loads up to 1.2 times the design filling pressure while maintaining a complete seal, ensuring high safety and reliability. Attached Figure Description

[0068] Figure 1 This is a structural cross-section of the filling retaining wall composite sealing structure of the present invention. Figure 1 .

[0069] Figure 2 This is a structural cross-section of the filling retaining wall composite sealing structure of the present invention. Figure 2 .

[0070] Figure 3 for Figure 2A magnified view of a portion of point A in the middle.

[0071] Figure 4 A side view of the structure for filling the pressure-applying body.

[0072] Figure 5 This diagram shows the connection relationship between the inner and outer retaining walls.

[0073] Figure 6 This is a schematic diagram of the internal structure of the seal (under non-operating conditions).

[0074] Figure 7 This is a schematic diagram of the internal structure of the seal (under operating conditions).

[0075] Figure 8 This is a cross-sectional view of a unidirectional diaphragm.

[0076] In the diagram: 1. Inner flexible sealing layer; 2. Main structure of retaining wall; 21. Inner retaining wall; 211. Sealing component one; 212. Connecting column; 22. Outer retaining wall; 221. Sealing component two; 222. Connecting body; 23. Airbag body; 24. Filling and pressurizing body; 241. Flexible body; 242. Column; 243. One-way moving body; 244. Filler body; 25. Angle plate; 26. Support plate; 27. Sealing body; 271. Elastic tearing body; 272. One-way diaphragm; 273. Fixing body one; 274. Fixing body two; 275. Scraper body; 276. Plug; 3. Gap filling layer; 4. Outer rigid sealing layer; 5. Rock mass. Detailed Implementation

[0077] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0078] Example 1:

[0079] like Figure 1 As shown, a composite sealing structure for a grout-proof filling retaining wall comprises, from the surface of the rock mass 5 to be sealed towards the interior of the retaining wall, the following components:

[0080] Inner flexible sealing layer 1, non-woven fabric laid on the surface of rock mass 5;

[0081] The retaining wall main structure 2 is a wall built on the inner flexible sealing layer 1. It can be a conventional structure such as brick masonry or concrete. The wall is equipped with a steel reinforcement structure. The steel reinforcement structure is anchored in the rock mass 5 for a length of at least 15cm. Due to the unevenness of the tunnel wall, a gap with a width of 3cm to 10cm is formed between the wall and the rock wall to ensure the compressive and impact resistance of the wall structure.

[0082] 3. Non-woven fabric filling layer 2, which is used to fill the gap between the main structure 2 of the retaining wall and the rock mass 5.

[0083] The outer rigid sealing layer 4 is a cement mortar or polymer sealant layer on the outside of the gap filling layer 3 outside the gap between the main structure 2 of the retaining wall and the non-woven fabric, used to prevent the gap filling layer 3 from failing during water permeation.

[0084] A construction method for a grout-proof filling retaining wall composite sealing structure, comprising the following steps:

[0085] Step 1: Surface preparation and material preparation

[0086] Clean the surface of the rock mass 5 at the location where the retaining wall is to be constructed, removing loose stones, debris and dirt;

[0087] Prepare sealing materials, one of which is non-woven fabric, which is polypropylene non-woven fabric with a unit area mass of 200-600g / m² and a thickness of 0.5-2mm.

[0088] The sealing material is cement mortar with a strength grade of not less than M10, or modified silane sealant;

[0089] Step 2: Laying the inner flexible sealing layer 1

[0090] The cut non-woven fabric is laid out and fixed on the cleaned rock surface 5, with the edges extending at least 10cm beyond the design outline of the retaining wall.

[0091] Step 3: Construct the main structure of the retaining wall 2

[0092] On top of the laid nonwoven fabric, construct the main structure of the retaining wall 2 according to the design requirements;

[0093] Step 4: Fill the gaps

[0094] The non-woven fabric is folded or rolled up and then tightly stuffed into the gap between the main retaining wall structure 2 and the rock mass 5 on both sides of the retaining wall structure 2 using an awl or similar object, with a stuffing depth of not less than 5cm.

[0095] Step 5: Apply the outer rigid sealing layer 4

[0096] Use cement mortar or modified silane sealant to seal the outer opening of the main body of the retaining wall, forming an outer rigid sealing layer 4. The outer rigid sealing layer 4 covers the outside of the gap filling layer 3, forming an integral sealing strip. The sealing strip covers the wall column structure 2 by at least 2cm, with a width of about 10cm and a thickness of about 1.5cm.

[0097] Step Six: Maintenance and Inspection

[0098] After the outer rigid sealing layer 4 reaches its initial strength, the filling operation will be carried out.

[0099] Example 2:

[0100] like Figures 2 to 8 As shown, unlike Embodiment 1, the main structure 2 of the retaining wall includes an inner retaining wall 21 and an outer retaining wall 22. A gap is reserved between the inner retaining wall 21 and the outer retaining wall 22. An airbag 23 is installed in the gap. A filling pressure body 24 is independently installed on the side of the airbag 23 facing the surface of the rock mass 5.

[0101] Among them, such as Figure 3 As shown, an angle plate 25 is installed in the gap between the inner retaining wall 21 and the outer retaining wall 22. A support plate 26 is installed on the angle plate 25. The support plate 26 is used to install the airbag body 23 and has a through hole for the air inlet pipe of the airbag body 23 to pass through. The air inlet pipe extends to the outside of the outer retaining wall 22 to facilitate the inflation operation of the airbag body 23. The support plate 26 and the angle plate 25 together serve as a top support platform for the airbag body 23, which is beneficial for the airbag body 23 to support the filling pressure body 24.

[0102] Among them, such as Figure 3 and Figure 4 As shown, the filling and pressurizing body 24 includes:

[0103] The flexible body 241 is arranged on the side of the airbag body 23 facing away from the support plate 26, and a column 242 is installed inside. Both ends of the column 242 are provided with unidirectional moving bodies 243 for moving only towards the rock mass 5. Several columns 242 are evenly spaced along the length of the flexible body 241. The several columns 242 can cope with the irregular structure of the surface of the rock mass 5. Since the flexible body 241 itself has the characteristics of flexibility (it can undergo appropriate elastic deformation), it can achieve the effect of flexible compression of the nonwoven fabric by the filler 244.

[0104] The filler 244 is set out in an outward V-shape on the side of the flexible body 241 opposite to the airbag body 23, and is used to compress the gap filling layer 3 and seal the gap between the main structure of the retaining wall 2 and the rock mass 5.

[0105] When the airbag 23 is inflated, the flexible body 241 receives a squeezing force towards the side closer to the rock mass 5. After squeezing, the unidirectional moving body 243 will prevent it from moving in the opposite direction. At the same time, it will gradually bring the filling body 244 closer and squeeze the non-woven fabric exposed between the inner and outer retaining walls. Finally, the filling body 244 will seal the gap between the inner and outer retaining walls and the rock mass 5, realizing a structure that allows water and air to pass through but not the filling sand.

[0106] Among them, such as Figure 5As shown, both the inner retaining wall 21 and the outer retaining wall 22 have a storage opening in the middle.

[0107] A sealing component 1 211 is installed inside the opening of the inner retaining wall 21, and a sealing component 221 is installed inside the opening of the outer retaining wall 22.

[0108] Both sealing component 1 (211) and sealing component 2 (221) are T-shaped structures;

[0109] The sealing component 1 211 and the sealing component 221 are connected by a connecting structure;

[0110] The connection structure includes a connecting post 212 installed on the first sealing component 211 and a connecting body 222 installed on the second sealing component 221. The connecting body 222 is used to be threadedly connected to the connecting post 212. Grouting in the tunnel space is a traditional grouting method in the industry, that is, a grouting hole is drilled above the tunnel and grout is injected inward.

[0111] Among them, the outer side of the sealing component 211 and the sealing component 221 is provided with a sealing body 27, which is used to seal the gap between the retaining wall and the sealing component.

[0112] Among them, such as Figures 6 to 7 As shown, the interior of the sealing body 27 is provided with an elastic tear body 271, which divides the interior of the sealing body 27 into two compartments. Both compartments 1 and 2 are provided with a one-way diaphragm 272 and a scraper 275. The scraper 275 tears the elastic tear body 271. The elastic tear body 271 is provided with a tearing structure corresponding to the position of the scraper 275. This tearing structure can be an inwardly concave V-shaped structure, which allows the elastic tear body 271 to easily break at the point where it is obstructed by the scraper 275 when the sealing body 27 deforms. This mixes the pre-filled materials in compartments 1 and 2 and causes an expansion effect. For example, compartment 1 is pre-filled with water, and compartment 2 is pre-filled with an expansion material (highly absorbent resin) that expands rapidly when it comes into contact with water.

[0113] The sealing body 27 is provided with a fixing body 1 273 and a fixing body 274. The fixing body 1 273 is installed on the corresponding retaining wall, and the fixing body 274 is used to be installed on the corresponding sealing component 221.

[0114] The unidirectional diaphragm 272 includes two diaphragm structures connected by electrostatic force. The side of the sealing body 27 is provided with a slot for installing the unidirectional diaphragm 272 and a plug 276 is installed in the slot for sealing after prefilling the corresponding material in the first or second compartment to prevent leakage of the prefilled material inside.

[0115] During implementation, the fixing body is first installed on the corresponding structure. Through axial insertion of the sealing component, as the two fixing bodies move closer to each other and then move further apart, until the internal scraper body 275 tears the elastic tearing body 271, the internal materials mix and expand. As the sealing component continues to be inserted, the sealing body 27 is completely clamped and sealed in the gap between the sealing component and the retaining wall to achieve the sealing operation. Even during grouting, the sealing state will be maintained.

[0116] A construction method for a grout-proof filling retaining wall composite sealing structure, comprising the following steps:

[0117] Step 1: Surface preparation and material preparation

[0118] Clean the surface of the rock mass 5 at the location where the retaining wall is to be constructed, removing loose stones, debris and dirt;

[0119] Prepare sealing materials, one of which is non-woven fabric, which is polypropylene non-woven fabric with a unit area mass of 200-600g / m² and a thickness of 0.5-2mm.

[0120] The sealing material is cement mortar with a strength grade of not less than M10, or modified silane sealant;

[0121] Step 2, Lay the inner flexible sealing layer 1

[0122] The cut non-woven fabric is laid out and fixed on the cleaned rock surface 5, with the edges extending at least 10cm beyond the design outline of the retaining wall.

[0123] Step 3, Construct the main structure of the retaining wall 2

[0124] On the laid nonwoven fabric, construct the inner retaining wall 21 and the outer retaining wall 22 according to the design requirements. Install the filling pressure body 24, the airbag body 23, the support plate 26 and the corner plate 25 in sequence in the gap reserved between the inner retaining wall 21 and the outer retaining wall 22.

[0125] Step 4, fill the gaps

[0126] The non-woven fabric 2 is folded or rolled up and tightly stuffed into the gap between the inner retaining wall 21 and the outer retaining wall 22 and the rock mass 5 using an awl or similar object, ensuring that the filling is full and that the non-woven fabric 2 is exposed in the gap between the inner retaining wall 21 and the outer retaining wall 22 for no less than 5 cm.

[0127] Inflate the airbag 23, and press the filling pressure body 24 to compress the non-woven fabric 2 exposed in the gap between the inner retaining wall 21 and the outer retaining wall 22. At the same time, it will seal the joint between the gap and the surface of the rock mass 5.

[0128] Step 5, wall sealing

[0129] The sealing component 211 is inserted into the inner retaining wall 21 from the inside out, and the sealing body 27 completes the sealing between the two.

[0130] The sealing component 221 is inserted into the outer retaining wall 22 from the inside out, and the sealing body 27 completes the sealing between the two.

[0131] The sealing component 211 and the sealing component 221 are connected by a connecting structure to form a structural whole.

[0132] Step 6, Apply the outer rigid sealing layer 4

[0133] Use cement mortar or modified silane sealant to seal the outer opening of the main body of the retaining wall, forming an outer rigid sealing layer 4. The outer rigid sealing layer 4 covers the outside of the gap filling layer 3, forming an integral sealing strip. The sealing strip covers the wall column structure 2 by at least 2cm, with a width of about 10cm and a thickness of about 1.5cm.

[0134] Step 7, Maintenance and Inspection

[0135] After the outer rigid sealing layer 4 reaches its initial strength, the filling operation will be carried out.

[0136] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A composite sealing structure for a grout-proof filling retaining wall, characterized in that, From the surface of the rock mass (5) to be sealed, into the interior of the retaining wall, the following are included in sequence: Inner flexible sealing layer (1), non-woven fabric laid on the surface of rock mass (5); The retaining wall main structure (2) is a wall built on the inner flexible sealing layer (1); The gap filling layer (3) is a non-woven fabric filling the gap between the main structure of the retaining wall (2) and the rock mass (5); The outer rigid sealing layer (4) is a cement mortar or polymer sealant layer that seals the gap between the main structure of the retaining wall (2) and the non-woven fabric.

2. The composite sealing structure for a grout-proof filling retaining wall according to claim 1, characterized in that, The main structure (2) of the retaining wall includes an inner retaining wall (21) and an outer retaining wall (22). A gap is reserved between the inner retaining wall (21) and the outer retaining wall (22). An airbag (23) is installed in the gap. A filling pressure body (24) is independently installed on the side of the airbag (23) facing the surface of the rock mass (5).

3. The composite sealing structure for a grout-proof filling retaining wall according to claim 2, characterized in that, An angle plate (25) is installed in the gap between the inner retaining wall (21) and the outer retaining wall (22). A support plate (26) is installed on the angle plate (25). The support plate (26) is used to install the airbag body (23) and has perforations.

4. The composite sealing structure for a grout-proof filling retaining wall according to claim 3, characterized in that, The filling pressure body (24) includes: The flexible body (241) is arranged on the side of the airbag body (23) facing away from the support plate (26), and a column (242) is installed inside. Both ends of the column (242) are provided with unidirectional moving bodies (243) for moving only towards the rock mass (5). The filler (244) is set out in an outward V-shape on the side of the flexible body (241) facing away from the airbag (23) to compress the gap filling layer (3) and seal it in the gap between the main structure of the retaining wall (2) and the rock mass (5).

5. The composite sealing structure for a grout-proof filling retaining wall according to claim 2, characterized in that, Both the inner retaining wall (21) and the outer retaining wall (22) have storage openings in the middle. A sealing component 1 (211) is installed inside the storage opening of the inner retaining wall (21), and a sealing component 2 (221) is installed inside the storage opening of the outer retaining wall (22). Both the first sealing component (211) and the second sealing component (221) are T-shaped structures; The first sealing component (211) and the second sealing component (221) are connected by a connecting structure; The connection structure includes a connecting post (212) installed on the first sealing component (211) and a connecting body (222) installed on the second sealing component (221), the connecting body (222) being threadedly connected to the connecting post (212).

6. The composite sealing structure for a grout-proof filling retaining wall according to claim 5, characterized in that, The outer sides of the first sealing component (211) and the second sealing component (221) are provided with sealing bodies (27) for sealing the gap between the retaining wall and the sealing components.

7. The composite sealing structure for a grout-proof filling retaining wall according to claim 6, characterized in that, The sealing body (27) is provided with an elastic tear body (271) inside. The elastic tear body (271) divides the interior of the sealing body (27) into a first compartment and a second compartment. Both the first compartment and the second compartment are provided with a one-way diaphragm (272) and a scraper (275). The elastic tear body (271) is provided with a tear structure corresponding to the position of the scraper (275). The sealing body (27) is provided with a fixing body one (273) and a fixing body two (274). The fixing body one (273) is installed on the corresponding retaining wall body, and the fixing body two (274) is used to be installed on the corresponding sealing part two (221).

8. The composite sealing structure for a grout-proof filling retaining wall according to claim 7, characterized in that, The unidirectional diaphragm (272) includes two diaphragm structures connected by electrostatic force. The side of the sealing body (27) is provided with a slot for installing the unidirectional diaphragm (272) and a plug (276) is installed in the slot.

9. The construction method of the anti-leakage grouting retaining wall composite sealing structure according to claim 1, characterized in that, The steps are as follows: Step 1: Surface preparation and material preparation Clean the surface of the rock mass (5) at the location where the retaining wall is to be constructed, and remove loose stones, debris and dirt; Prepare sealing materials, one of which is non-woven fabric, which is polypropylene non-woven fabric with a unit area mass of 200-600g / m² and a thickness of 0.5-2mm. The sealing material is cement mortar with a strength grade of not less than M10, or modified silane sealant; Step 2: Laying the inner flexible sealing layer (1) The cut nonwoven fabric is laid out and fixed on the cleaned rock mass (5) surface, with the edge extending at least 10cm beyond the design outline of the retaining wall. Step 3: Construct the main structure of the retaining wall (2) On the non-woven fabric that has been laid, the main structure of the retaining wall is constructed according to the design requirements (2). Step 4: Fill the gaps The non-woven fabric is folded or rolled up and then tightly stuffed into the gap between the main structure of the retaining wall (2) and the rock mass (5) on both sides of the retaining wall main structure (2) using an awl or similar object, with a stuffing depth of not less than 5cm. Step 5: Apply the outer rigid sealing layer (4) Use cement mortar or modified silane sealant to seal the outer opening of the main gap of the retaining wall to form an outer rigid sealing layer (4). The outer rigid sealing layer (4) covers the outside of the gap filling layer (30) to form an integral sealing strip. The sealing strip covers the wall column structure (2) by at least 2cm, with a width of about 10cm and a thickness of about 1.5cm. Step Six: Maintenance and Inspection After the outer rigid sealing layer (4) reaches its initial strength, the filling operation is carried out.

10. The construction method of the anti-leakage grouting retaining wall composite sealing structure according to claim 8, characterized in that, The steps are as follows: Step 1: Surface preparation and material preparation Clean the surface of the rock mass (5) at the location where the retaining wall is to be constructed, and remove loose stones, debris and dirt; Prepare sealing materials, one of which is non-woven fabric, which is polypropylene non-woven fabric with a unit area mass of 200-600g / m² and a thickness of 0.5-2mm. The sealing material is cement mortar with a strength grade of not less than M10, or modified silane sealant; Step 2, Lay the inner flexible sealing layer (1) The cut nonwoven fabric is laid out and fixed on the cleaned rock mass (5) surface, with the edge extending at least 10cm beyond the design outline of the retaining wall. Step 3, construct the main structure of the retaining wall (2) On the laid nonwoven fabric, construct the inner retaining wall (21) and the outer retaining wall (22) according to the design requirements. Install the filling pressure body (24), the airbag body (23), the support plate (26) and the corner plate (25) in sequence in the gap reserved between the inner retaining wall (21) and the outer retaining wall (22). Step 4, fill the gaps The nonwoven fabric is folded or rolled up and then tightly stuffed into the gap between the inner retaining wall (21) and the outer retaining wall (22) and the rock mass (5) using an awl or similar object to ensure full filling. The nonwoven fabric is not less than 5 cm exposed in the gap between the inner retaining wall (21) and the outer retaining wall (22). Inflate the airbag (23) and press the filling pressure body (24) to compress the non-woven fabric exposed in the gap between the inner retaining wall (21) and the outer retaining wall (22), while sealing the gap and the joint between the rock mass (5) surface. Step 5, wall sealing The sealing component (211) is inserted into the inner retaining wall (21) from the inside out, and the sealing body (27) completes the sealing of the two. The sealing component 2 (221) is inserted into the outer retaining wall (22) from the inside out, and the sealing body (27) completes the sealing of the two. The sealing component one (211) and the sealing component two (221) are connected by a connecting structure to form a structural whole; Step 6, Apply the outer rigid sealing layer (4) Use cement mortar or modified silane sealant to seal the outer opening of the main gap of the retaining wall to form an outer rigid sealing layer (4). The outer rigid sealing layer (4) covers the outside of the gap filling layer (30) to form an integral sealing strip. The sealing strip covers the wall column structure (2) by at least 2cm, with a width of about 10cm and a thickness of about 1.5cm. Step 7, Maintenance and Inspection After the outer rigid sealing layer (4) reaches its initial strength, the filling operation is carried out.

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