Composite-structure wide-source cementing material retaining wall

Abstract

The utility model provides a wide-source cementing material retaining wall with a composite structure, which belongs to the field of geotechnical engineering and comprises a foundation pit excavated under the current ground, a layer of impermeable geotechnical cloth is laid at the bottom of the foundation pit, and wide-source cementing materials are filled at the top of the foundation pit to form a wide-source cementing material layer. The inner slope side of the wide-source cementing material layer is backfilled with soil to form roadbed filling soil, and the outer slope side of the wide-source cementing material layer is sequentially poured to form a strip-shaped foundation and a concrete protection panel; the top of the wide-source cementing material layer and the top of the concrete protection panel are poured to form a guardrail base, a retaining wall concrete guardrail is arranged on the top of the guardrail base, and a pavement structure is laid on the inner side of the guardrail base and located on the top of the wide-source cementing material layer and the roadbed filling soil. On the premise that the stability and durability of the retaining wall are met, local materials are fully utilized, synchronous construction with roadbed filling can be achieved, and therefore the green building purposes of being low in cost, short in construction period, low in carbon and environmentally friendly are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of geotechnical engineering, specifically relates to a composite structure Guangyuan cementing material retaining wall. BACKGROUND

[0002] At present, the common retaining wall material in highway design is concrete, piece stone concrete or masonry, and the main problems at present are: first, the specification has higher strength requirements for concrete retaining wall and masonry retaining wall, which is mainly limited by the requirement of durability, and the actual prepared material strength has more surplus. Second, the highway retaining wall uses concrete and piece stone materials which are not environmentally friendly and high in cost, and often there is a problem that the excavated stone cannot meet the design requirements, and the material needs to be transported or purchased for masonry retaining wall, which is not conducive to engineering construction and increases investment. At the same time, a large amount of roadbed filling soil, soft soil, soft rock, construction waste and the like are often encountered in engineering, and in some places, there are also a large amount of industrial waste, which is often treated as waste due to poor engineering properties, which not only affects the local ecological environment and occupies arable land, but also increases the disposal cost, which is contrary to the current design concept, and how to make good use of these poor materials is a problem to be solved.

[0003] The construction engineering raw materials commonly existing in nature such as sand gravel, gravel soil, pond silt, discarded soil and the like are collectively referred to as Guangyuan material, the Guangyuan material is modified or improved, the particles are cemented, so that it has certain strength and cohesion, and this material with certain cementing properties after physical and chemical modification is referred to as Guangyuan cementing material, which is referred to as cementing material hereinafter. The building which uses Guangyuan material or Guangyuan cementing material entirely or partially is referred to as Guangyuan building.

[0004] The related cementing material strength test (unconfined compression, triaxial, tensile, shear), crack test (early cracking test), durability test (permeability resistance, drying shrinkage test) and field process test results show that the modified roadbed soil (i.e. cementing material) with a cement content of about 8% has related mechanical properties and physical properties which meet the general heavy retaining wall structure design checking and durability, has the characteristics of moderate strength, easy construction, green environmental protection and low cost, and can be used to build filling roadbed retaining walls.

[0005] Although CN116180806A also discloses a Guangyuan cementing material retaining wall supporting structure and construction method, but this retaining wall can usually only adapt to the wall retaining of small slope, and cannot well adapt to the retaining requirements of large height and steep slope of roadbed. UTILITY MODEL CONTENTS

[0006] The purpose of this utility model is to provide a composite structure Guangyuan cementitious retaining wall that, while meeting the requirements of retaining wall stability and durability, fully utilizes local materials and can be constructed simultaneously with roadbed filling, thereby achieving the green construction goals of low cost, short construction period, and low carbon emissions. In addition, by using a support template for compaction, the wall slope is steeper than that of a typical inclined retaining wall, allowing for near-vertical installation, saving land, avoiding the formation of internal corners on the inside of the template, and facilitating the compaction of the Guangyuan cementitious material.

[0007] To achieve the aforementioned technical features, the purpose of this utility model is as follows: A composite structure Guangyuan cementitious retaining wall includes an excavation of a foundation pit below the existing ground level, a layer of impermeable geotextile laid at the bottom of the foundation pit, Guangyuan cementitious material filling the top of the foundation pit to form a Guangyuan cementitious material layer, backfilling soil on the inner slope side of the Guangyuan cementitious material layer to form roadbed fill, and casting a strip foundation and a concrete protective panel on the outer slope side of the Guangyuan cementitious material layer in sequence; a guardrail base is cast on top of the Guangyuan cementitious material layer and the concrete protective panel, a retaining wall concrete guardrail is installed on top of the guardrail base, and a pavement structure is laid on the inner side of the guardrail base and on top of the Guangyuan cementitious material layer and the roadbed fill.

[0008] A drainage filter layer is provided between the Guangyuan cementitious material layer and the roadbed fill.

[0009] The slope of the concrete protective panel is 1:n1; the slope of the lower cementitious layer inside the Guangyuan cementitious layer slope is 1:n3, and the slope of the lower cementitious layer is in the same direction as the slope of the concrete protective panel; the slope of the upper cementitious layer inside the Guangyuan cementitious layer slope is 1:n4, and the slope of the upper cementitious layer is in the opposite direction to the slope of the concrete protective panel.

[0010] The bottom of the foundation pit adopts a reverse slope structure with a slope of 1:n2;

[0011] The slope of the concrete protective panel is greater than the slope of the lower binder layer;

[0012] This leads to the formation of a counterweight composite structure Guangyuan cementitious retaining wall.

[0013] The slope direction of the inner side of the Guangyuan binder layer is opposite to that of the concrete protective panel, and the slope direction of the outer side of the Guangyuan binder layer is in the same direction as that of the concrete protective panel, and the slopes are equal.

[0014] The bottom of the foundation pit adopts a sloping structure with a slope of 1:n2; the slope of the bottom of the foundation pit is in the same direction as the slope of the inner side of the Guangyuan cementitious material layer.

[0015] The slope of the inner side of the Guangyuan binder layer is 1:n5;

[0016] The slope of the concrete protective panel is 1:n1;

[0017] This leads to the formation of a sloping, Guangyuan cementitious composite retaining wall.

[0018] The interior of the Guangyuan binder layer is provided with multiple sets of staggered retaining wall drainage pipes along the height direction; and the retaining wall drainage pipes penetrate the concrete protective panel.

[0019] A pit sealing layer is provided at the top of the pit and on the outside of the strip foundation;

[0020] A drainage ditch is provided at the base of the retaining wall;

[0021] The concrete retaining wall railing has drainage holes running through its interior.

[0022] A step is provided at the top of the Guangyuan binder layer where it intersects with the concrete protective panel.

[0023] The present invention has the following beneficial effects:

[0024] 1. This utility model follows the concept of "suitable materials and suitable structure, suitable materials and suitable structure". On the one hand, it selects appropriate material modification to adapt to the material performance requirements of different structures with large volume and low stress. On the other hand, it improves the design based on the constitutive model to adapt to new materials. It moves in the same direction from both material and structural aspects to achieve the goal of low-carbon, environmentally friendly and green construction.

[0025] 2. The retaining wall binder of this utility model is made by modifying the roadbed fill by adding a small amount of gel material. It can achieve local material sourcing and the cost is 80% of the cost of rubble concrete retaining walls, with obvious economic benefits.

[0026] 3. This utility model realizes the simultaneous compaction construction of the main structure of the Guangyuan material retaining wall, the drainage filter layer, and the roadbed fill. The main structure is longitudinally jointless, which effectively shortens the construction period compared with the traditional plain concrete retaining wall construction process.

[0027] 4. This utility model studies a new type of retaining wall concrete panel, which, together with the foundation pit anti-seepage geotextile and road structure, forms a complete water sealing system, enhancing the durability of the retaining wall.

[0028] 5. The counterweight retaining wall structure adopted in this utility model is formed by setting a supporting template and rolling it. The slope of the wall surface is steeper than that of a general inclined retaining wall, which saves land and avoids the appearance of inside corners on the inside of the template, making it easier to compact the material.

[0029] 6. The retaining wall of this utility model can meet the requirements of stability and durability of retaining wall support. It can replace the general traditional gravity concrete and rubble retaining walls. It can realize the use of local materials, shorten the construction period, and has obvious economic benefits. It also achieves the goal of green and low-carbon building with less or even zero waste, and has significant social benefits.

[0030] 7. This utility model enhances the interlocking between the concrete panel and the Guangyuan cementitious retaining wall by setting a 30cm×30cm step at the top of the wall, thereby improving the overall stability and reducing stress concentration at the top of the Guangyuan cementitious retaining wall.

[0031] 8. This utility model effectively prevents groundwater from soaking the retaining wall during construction and improves the durability of the Guangyuan cementitious retaining wall by setting up impermeable geotextile. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a cross-sectional view of the first type of gravity-type Guangyuan cementitious composite structure retaining wall according to the present invention.

[0034] Figure 2 This is a cross-sectional view of the second type of inclined Guangyuan cementitious composite structure retaining wall of the present invention.

[0035] In the diagram: 1. Road surface structure; 2. Existing ground surface; 3. Concrete protective panel; 4. Guangyuan binder layer; 5. Retaining wall drainage pipe; 6. Strip foundation; 7. Drainage filter layer; 8. Impermeable geotextile; 9. Drainage ditch; 10. Roadbed fill layer; 11. Drainage hole at the top of the wall; 12. Guardrail base; 13. Drainage hole in the retaining wall; 14. Concrete guardrail of the retaining wall; 15. Step; 16. Half-width roadbed; 17. Shoulder; 18. Foundation pit; 19. Foundation pit sealing layer; 20. Lower binder layer; 21. Upper binder layer. Detailed Implementation

[0036] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0037] Example 1:

[0038] See Figure 1This embodiment provides a counterweight-type Guangyuan cementitious composite structure retaining wall, including an excavation of a foundation pit 18 below the existing ground level 2, a layer of impermeable geotextile 8 laid at the bottom of the foundation pit 18, Guangyuan cementitious material filling the top of the foundation pit 18 to form a Guangyuan cementitious material layer 4, backfilling soil on the inner slope side of the Guangyuan cementitious material layer 4 to form a roadbed fill 10, and casting a strip foundation 6 and a concrete protective panel 3 on the outer slope side of the Guangyuan cementitious material layer 4 in sequence; a guardrail base 12 is cast on top of the Guangyuan cementitious material layer 4 and the concrete protective panel 3, a retaining wall concrete guardrail 14 is set on top of the guardrail base 12, and a road surface structure 1 is laid on the inner side of the guardrail base 12 and on top of the Guangyuan cementitious material layer 4 and the roadbed fill 10. By adopting the above-mentioned retaining wall, under the premise of meeting the stability and durability of the retaining wall, it is possible to make full use of local materials and carry out construction simultaneously with the roadbed filling, thereby achieving the green construction goals of low cost, short construction period, and low carbon and environmental protection. In addition, by setting up supporting formwork and compacting, the wall slope is steeper than that of a general inclined retaining wall, and it can be set up almost vertically, saving land use and avoiding the appearance of inside corners on the inside of the formwork, which facilitates the compaction of Guangyuan cementitious material.

[0039] Furthermore, a drainage filter layer 7 is provided between the Guangyuan cementitious material layer 4 and the roadbed fill 10. The drainage filter layer 7 effectively prevents the blockage of the retaining wall drainage pipe 5.

[0040] Furthermore, the slope of the concrete protective panel 3 is 1:n1; the slope of the lower cementitious layer 20 inside the slope of the Guangyuan cementitious layer 4 is 1:n3, and the slope of the lower cementitious layer 20 is in the same direction as the slope of the concrete protective panel 3; the slope of the upper cementitious layer 21 inside the slope of the Guangyuan cementitious layer 4 is 1:n4, and the slope of the upper cementitious layer 21 is in the opposite direction to the slope of the concrete protective panel 3. Through the above slope settings, a counterweight Guangyuan cementitious composite retaining wall is formed, ensuring the overall structural stability of the retaining wall.

[0041] Furthermore, the bottom of the foundation pit 18 adopts a reverse slope structure with a slope of 1:n2; the slope acts as a reaction force, thereby enhancing the support stability of the bottom of the Guangyuan cementitious material layer 4.

[0042] Furthermore, the slope of the concrete protective panel 3 is greater than the slope of the lower binder layer 20.

[0043] Furthermore, within the Guangyuan binder layer 4, multiple sets of staggered retaining wall drainage pipes 5 are arranged along the height direction; and the retaining wall drainage pipes 5 penetrate the concrete protective panel 3. The aforementioned retaining wall drainage pipes 5 can be used for water supply and drainage of the retaining wall. A 110mm drainage hole is staggered every 2-3m along the wall, and the drainage holes use steel-plastic drainage pipes to prevent damage from construction crushing.

[0044] Furthermore, a pit sealing layer 19 is provided at the top of the pit 18 and on the outside of the strip foundation 6. The pit sealing layer 19 can be used to effectively seal the top of the pit 18.

[0045] Furthermore, a drainage ditch 9 is provided at the bottom of the retaining wall. The drainage ditch 9 can be used for subsequent drainage at the bottom of the retaining wall.

[0046] Furthermore, a step 15 is provided at the top of the Guangyuan binder layer 4 where it intersects with the concrete protective panel 3.

[0047] Preferably, the interior of the retaining wall concrete guardrail 14 is provided with a retaining wall drainage hole 13.

[0048] Example 2:

[0049] See Figure 1 This utility model provides a construction method for a counterweight-type Guangyuan cementitious composite retaining wall, including the following steps:

[0050] Step 1, Cleaning the existing ground surface 2:

[0051] Clean up the existing ground surface 2 and compact it to achieve the design requirements;

[0052] Step 2, Excavation of foundation pit 18:

[0053] The retaining wall was measured and laid out, the foundation pit 18 was excavated, a layer of impermeable geotextile 8 was laid at the bottom of the foundation pit 18, the foundation part was filled with Guangyuan cementitious material, and the strip foundation 6 was constructed.

[0054] Step 3, construction of filling pit 18:

[0055] Once the concrete strength of the strip foundation 6 reaches the design value, Guangyuan binder is used to backfill the foundation pit 18, and concrete is poured on the top of the pit to form a foundation pit sealing layer 19 to seal the foundation pit.

[0056] Step 4, Setting up a template:

[0057] The first time, external support templates were set up along the wall. Guangyuan cementitious material layer 4, drainage filter layer 7, and roadbed fill layer 10 were laid in layers with a loose thickness of 30cm~40cm. All parts were simultaneously compacted to the design compaction degree. Small road rollers were used to compact the area within 1m~2m of the external support templates.

[0058] Guangyuan cementitious material and the backfilling process of the roadbed paving were simultaneously installed with the retaining wall drainage pipe 5;

[0059] Step 5, Setting up step 15:

[0060] After the Guangyuan binder is laid to the top of the wall, the steps with dimensions h×h on the top of the wall are manually trimmed by 15.

[0061] Step 6, Setting up the secondary template:

[0062] Remove the primary formwork and move it 20cm~25cm outward to re-erect the formwork;

[0063] Step 7, pouring of concrete protective panel 3:

[0064] The wall surface formed by the Guangyuan binder layer 4 is roughened, and then concrete protective panel 3 is poured. The last layer of panel concrete is poured together with the top wall concrete to strengthen the connection between the panel concrete, the top wall concrete and the Guangyuan binder.

[0065] Step 8, Construction of retaining wall concrete guardrail 14 and road surface structure 1:

[0066] After the concrete protective panel 3 and the top of the wall are completed, the guardrail base 12, the retaining wall concrete guardrail 14 and the road structure 1 are poured.

[0067] Furthermore, the compaction degree of the Guangyuan cementitious composite structure retaining wall formed by the Guangyuan cementitious layer 4 is not less than 93%, the 28-day unconfined compressive strength is ≥2.5MPa, a small road roller is used for compaction within 1m of the template, and the compaction degree of the roadbed fill is determined in accordance with the "Highway Roadbed Design Specification" JTG D30-2015.

[0068] Furthermore, the concrete protective panel 3 is provided with a reinforced concrete strip foundation 6. The concrete protective panel 3 is 20cm thick and has the same slope as the wall. The strength grade of the concrete is C25 or C30.

[0069] Furthermore, a drainage hole is installed every 2-3 meters vertically along the wall, with steel-plastic drainage pipes used for the drainage holes. This arrangement of drainage holes effectively achieves drainage.

[0070] Furthermore, the longitudinal joints of the concrete protective panel 3 are consistent with the segment lengths of the guardrail base 12 and the strip foundation 6. The Guangyuan binder layer 4, the drainage filter layer 7, and the roadbed fill layer 10 are constructed continuously in layers without joints. Through the above arrangement, the structural stability of the concrete protective panel 3 is ensured.

[0071] Furthermore, the inter-layer construction intervals are as follows: less than 3 hours for continuous construction, 3 to 16 hours without construction, and more than 16 hours for construction. These inter-layer construction intervals ensure construction quality.

[0072] Furthermore, the Guangyuan cementitious material or soil sample has the following properties: CBR content not less than 3%, maximum particle size less than 20 mm, content of particles smaller than 0.075 mm not more than 40%, organic matter content ≤ 5%, and the moisture content of the soil is 4% to 5% greater than that of the cementitious material. These material properties ensure the structural strength of the subsequent Guangyuan cementitious material composite retaining wall.

[0073] Furthermore, Guangyuan binder has the following properties: compaction degree ≥93%, moisture content ±2%, and 7-day shear strength C and Φ values ​​meet the design requirements.

[0074] Furthermore, the steel-plastic drainage pipe has a nominal diameter of 90mm, an outer diameter of 110mm, and a ring stiffness of not less than 6.4MPa. This ensures the overall structural strength and stability, preventing damage to the pipe body during the rolling process.

[0075] Example 3:

[0076] See Figure 2 This embodiment provides a sloped Guangyuan cementitious composite structure retaining wall, including an excavation of a foundation pit 18 below the existing ground level 2, a layer of impermeable geotextile 8 laid at the bottom of the foundation pit 18, Guangyuan cementitious material filling the top of the foundation pit 18 to form a Guangyuan cementitious material layer 4, backfilling soil on the inner slope side of the Guangyuan cementitious material layer 4 to form a roadbed fill 10, and casting a strip foundation 6 and a concrete protective panel 3 on the outer slope side of the Guangyuan cementitious material layer 4 in sequence; a guardrail base 12 is cast on top of the Guangyuan cementitious material layer 4 and the concrete protective panel 3, and a retaining wall concrete guardrail 14 is set on top of the guardrail base 12. A road surface structure 1 is laid on the inner side of the guardrail base 12 and on top of the Guangyuan cementitious material layer 4 and the roadbed fill 10. The slope direction of the inner side of the Guangyuan binder layer 4 is opposite to that of the concrete protective panel 3, while the slope direction of the outer side of the Guangyuan binder layer 4 is in the same direction as that of the concrete protective panel 3, and the slopes are equal. This utility model of a downward-sloping Guangyuan binder retaining wall has significant advantages, making it more conducive to on-site construction and quality control. Furthermore, while meeting the requirements for retaining wall stability and durability, it achieves full utilization of local materials and simultaneous construction with roadbed filling, thus achieving the green construction goals of low cost, short construction period, and low carbon emissions. Compared to inclined and counterweight binder retaining walls, the downward-sloping binder retaining wall has significant advantages: its main structural cross-section is more regular than that of the counterweight type, effectively avoiding stress concentration.

[0077] Furthermore, a drainage filter layer 7 is provided between the Guangyuan cementitious material layer 4 and the roadbed fill 10. The drainage filter layer 7 effectively prevents the blockage of the retaining wall drainage pipe 5.

[0078] Furthermore, the bottom of the foundation pit 18 adopts a sloping structure with a slope of 1:n2; the slope of the bottom of the foundation pit 18 is in the same direction as the slope of the inner side of the Guangyuan binder layer 4; the slope of the inner side of the Guangyuan binder layer 4 is 1:n5; and the slope of the concrete protective panel 3 is 1:n1. Through the above slope design, its main structure cross-section is more regular than that of the counterweight type, which can effectively avoid stress concentration; the wall surface is steeper than that of the inclined retaining wall, and can be set approximately vertically. There are no internal corners on the inner side of the outer formwork, so as to avoid the occurrence of compaction blind spots in the compaction range of the road roller, effectively ensuring the compaction degree of the wall; the back of the wall is inclined, which can make full use of the self-stabilizing property of the binder, making it easy to lay each layer in the order of binder → drainage filter layer → roadbed fill, which is conducive to strengthening the interface connection and compaction of the binder.

[0079] Furthermore, within the Guangyuan binder layer 4, multiple sets of staggered retaining wall drainage pipes 5 are arranged along the height direction; and the retaining wall drainage pipes 5 penetrate the concrete protective panel 3. The aforementioned retaining wall drainage pipes 5 can be used for water supply and drainage of the retaining wall. A 110mm drainage hole is staggered every 2-3m along the wall, and the drainage holes use steel-plastic drainage pipes to prevent damage from construction crushing.

[0080] Furthermore, a pit sealing layer 19 is provided at the top of the pit 18 and on the outside of the strip foundation 6. The pit sealing layer 19 can be used to effectively seal the top of the pit 18.

[0081] Furthermore, a drainage ditch 9 is provided at the bottom of the retaining wall. The drainage ditch 9 can be used for subsequent drainage at the bottom of the retaining wall.

[0082] Furthermore, a step 15 is provided at the top of the Guangyuan binder layer 4 where it intersects with the concrete protective panel 3.

[0083] Preferably, the interior of the retaining wall concrete guardrail 14 is provided with a retaining wall drainage hole 13.

[0084] Example 4:

[0085] See Figure 2 This utility model provides a construction method for a sloped Guangyuan cementitious composite retaining wall, including the following steps:

[0086] Step 1, Cleaning the existing ground surface 2:

[0087] Clean up the existing ground surface 2 and compact it to achieve the design requirements;

[0088] Step 2, Excavation of foundation pit 18:

[0089] The retaining wall was measured and laid out, the foundation pit 18 was excavated, a layer of impermeable geotextile 8 was laid at the bottom of the foundation pit 18, the foundation part was filled with Guangyuan cementitious material, and the strip foundation 6 was constructed.

[0090] Step 3, construction of filling pit 18:

[0091] Once the concrete strength of the strip foundation 6 reaches the design value, Guangyuan binder is used to backfill the foundation pit 18, and concrete is poured on the top of the pit to form a foundation pit sealing layer 19 to seal the foundation pit.

[0092] Step 4, Setting up a template:

[0093] For the first time, external support formwork is set along the wall. The material is laid in layers in the order of Guangyuan cementitious material layer 4, drainage filter layer 7, and roadbed fill layer 10, with a loose thickness of 30cm~40cm. Each part is simultaneously compacted to the design compaction degree. A road roller is used to compact the area within 1m~2m of the external support formwork.

[0094] Guangyuan cementitious material and the backfilling process of the roadbed paving were simultaneously installed with the retaining wall drainage pipe 5;

[0095] Step 5, Setting up step 15:

[0096] After the Guangyuan binder is laid to the top of the wall, the steps with dimensions h×h on the top of the wall are manually trimmed by 15.

[0097] Step 6, Setting up the secondary template:

[0098] Remove the primary formwork and move it 20cm~25cm outward to re-erect the formwork;

[0099] Step 7, pouring of concrete protective panel 3:

[0100] The wall surface formed by the Guangyuan binder layer 4 is roughened, and then concrete protective panel 3 is poured. The last layer of panel concrete is poured together with the top wall concrete to strengthen the connection between the panel concrete, the top wall concrete and the Guangyuan binder.

[0101] Step 8, Construction of retaining wall concrete guardrail 14 and road surface structure 1:

[0102] After the concrete protective panel 3 and the top of the wall are completed, the guardrail base 12, the retaining wall concrete guardrail 14 and the road structure 1 are poured.

[0103] Furthermore, the compaction degree of the Guangyuan cementitious composite structure retaining wall formed by the Guangyuan cementitious layer 4 is not less than 93%, the 28-day unconfined compressive strength is ≥2.5MPa, the formwork is compacted by a road roller within 1m, and the compaction degree of the subgrade fill is determined in accordance with the "Highway Subgrade Design Specification" JTG D30-2015.

[0104] Furthermore, the concrete protective panel 3 is provided with a reinforced concrete strip foundation 6. The concrete protective panel 3 is 20cm thick and has the same slope as the wall. The strength grade of the concrete is C25 or C30.

[0105] Furthermore, a drainage hole is installed every 2-3 meters vertically along the wall, with steel-plastic drainage pipes used for the drainage holes. This arrangement of drainage holes effectively achieves drainage.

[0106] Furthermore, the longitudinal joints of the concrete protective panel 3 are consistent with the segment lengths of the guardrail base 12 and the strip foundation 6. The Guangyuan binder layer 4, the drainage filter layer 7, and the roadbed fill layer 10 are constructed continuously in layers without joints. Through the above arrangement, the structural stability of the concrete protective panel 3 is ensured.

[0107] Furthermore, the inter-layer construction intervals are as follows: less than 3 hours for continuous construction, 3 to 16 hours without construction, and more than 16 hours for construction. These inter-layer construction intervals ensure construction quality.

[0108] Furthermore, the Guangyuan cementitious material or soil sample has the following properties: CBR content not less than 3%, maximum particle size less than 20 mm, content of particles smaller than 0.075 mm not more than 40%, organic matter content ≤ 5%, and the moisture content of the soil is 4% to 5% greater than that of the cementitious material. These material properties ensure the structural strength of the subsequent Guangyuan cementitious material composite retaining wall.

[0109] Furthermore, Guangyuan binder has the following properties: compaction degree ≥93%, moisture content ±2%, and 7-day shear strength C and Φ values ​​meet the design requirements.

[0110] Furthermore, the steel-plastic drainage pipe has a nominal diameter of 90mm, an outer diameter of 110mm, and a ring stiffness of not less than 6.4MPa. This ensures the overall structural strength and stability, preventing damage to the pipe body during the rolling process.

Claims

1. A composite structure broad source cementing material retaining wall, characterized in that, The present application relates to a kind of retaining wall, including the foundation pit (18) excavated below the present situation ground (2), the bottom of foundation pit (18) is laid with a layer of impermeable geotextile (8), the top of foundation pit (18) is filled with Guangyuan cementing material and then forms Guangyuan cementing material layer (4), the inner slope side of Guangyuan cementing material layer (4) is filled with soil and then forms roadbed fill (10), the outer slope side of Guangyuan cementing material layer (4) is poured and then forms strip foundation (6) and concrete protection panel (3) in sequence;The top of Guangyuan cementing material layer (4) and concrete protection panel (3) is poured to form guardrail base (12), the top of guardrail base (12) is provided with retaining wall concrete guardrail (14), the inside of guardrail base (12) and located at the top of Guangyuan cementing material layer (4) and roadbed fill (10) is paved with pavement structure (1).

2. The composite structure of the broad source cementing material retaining wall according to claim 1, characterized in that: The transition between the Guangyuan cementing material layer (4) and the roadbed fill (10) is provided with a drainage and anti-filtration layer (7).

3. The composite structure of the broad source cementing material retaining wall according to claim 1, characterized in that: The slope of the concrete protection panel (3) is 1:n1; the slope of the lower cementing material layer (20) inside the Guangyuan cementing material layer (4) slope body is 1:n3, and the slope of the lower cementing material layer (20) is in the same direction as the slope of the concrete protection panel (3); the slope of the upper cementing material layer (21) inside the Guangyuan cementing material layer (4) slope body is 1:n4, and the slope of the upper cementing material layer (21) is in the opposite direction of the slope of the concrete protection panel (3); The bottom of the foundation pit (18) adopts an inverse slope structure, and the slope is 1:n2; The slope of the concrete protection panel (3) is greater than the slope of the lower cementing material layer (20); Thus, a balance type composite structure Guangyuan cementing material retaining wall is formed.

4. The composite structure of the broad source cementing material retaining wall according to claim 1, characterized in that: The slope direction of the Guangyuan cementing material layer (4) inside is opposite to the slope direction of the concrete protection panel (3), the slope direction of the Guangyuan cementing material layer (4) outside is in the same direction as the slope of the concrete protection panel (3), and the slope is equal; The bottom end of the foundation pit (18) adopts a slope structure, and the slope is 1:n2; the slope of the foundation pit (18) bottom is in the same direction as the slope direction of the Guangyuan cementing material layer (4) inside; The slope of the Guangyuan cementing material layer (4) inside is 1:n5; The slope of the concrete protection panel (3) is 1:n1; Thus, a downward inclined Guangyuan cementing material composite structure retaining wall is formed.

5. The composite structure retaining wall of claim 1, wherein: The Guangyuan cementing material layer (4) is internally provided with a plurality of groups of staggered retaining wall drainage pipes (5) along the height direction; and the retaining wall drainage pipes (5) penetrate the concrete protection panel (3).

6. The composite structure retaining wall of claim 1, wherein: The top of the foundation pit (18) and located outside the strip foundation (6) is provided with a foundation pit sealing layer (19); The bottom of the retaining wall is provided with a drainage ditch (9); The retaining wall concrete guardrail (14) is internally provided with a retaining wall drainage hole (13).

7. The composite structure retaining wall of claim 1, wherein: The top of the Guangyuan cementing material layer (4) and the part intersecting with the concrete protection panel (3) are provided with a step (15).

8. The composite structure retaining wall of claim 1, wherein, The Guangyuan cementing material composite structure retaining wall formed by the Guangyuan cementing material layer (4) has a compaction degree of not less than 93%, a 28d unconfined compressive strength of ≥2.5MPa, and a small roller compaction within a 1m range of the formwork.

9. The composite structure retaining wall of claim 1, wherein, The concrete protection panel (3) is provided with a reinforced concrete strip foundation (6), the thickness of the concrete protection panel (3) is 20 cm, the slope is the same as the wall surface, and the strength grade of the concrete is C25 or C30; A drain hole is arranged every 2-3 m on the wall body in an up-down staggered manner, and the drain hole adopts a steel-plastic drain pipe; The longitudinal split of the concrete protection panel (3) is consistent with the segmented length of the guardrail base (12) and the strip foundation (6).

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