Design method, construction method of retaining wall containing waste concrete blocks and retaining wall

Abstract

The present invention belongs to the technical field of gravity retaining walls, and relates to a design method, a construction method and a retaining wall of a retaining wall containing waste concrete blocks. The wall body is jointly built by waste concrete blocks and concrete materials. The volume ratio of the waste concrete blocks in the gravity retaining wall body is 10% to 60%; the newly poured concrete material of the retaining wall body is used to meet the requirements of the wall section strength and durability, and the self-weight of the newly poured concrete material and the waste concrete blocks of the wall body is used to meet the requirements of the wall body stability. After preliminary estimation, the proportion of the waste concrete volume can reach more than 30%, which can effectively utilize waste and avoid resource waste; the acquisition channels of waste concrete blocks are convenient, and the construction waste in road engineering and building construction projects can be utilized, which can effectively save construction costs; the recycling of waste concrete blocks reduces the use of natural building materials, avoids the exploitation of sand and gravel materials and the disposal of construction waste, is beneficial to environmental protection, and conforms to the national sustainable development strategy.

Description

Technical Field

[0001] The present invention belongs to the technical field of retaining structures, specifically relates to the technical field of gravity retaining walls, and more specifically, relates to a design method, a construction method and a retaining wall containing waste concrete blocks. Background Art

[0002] The gravity retaining wall belongs to a traditional structural form. Due to rich material sources, simple form, convenient material taking and simple construction, it is currently widely used. In order to adapt to the requirements of variable terrain conditions and foundation bearing capacity, it has gradually developed into a general gravity retaining wall, a retaining wall with a broken-line wall back and a counterfort retaining wall. The gravity retaining wall relies on its own weight to resist the lateral pressure of the soil behind the wall and is cast integrally with rubble concrete or concrete.

[0003] The gravity retaining wall bears a large earth pressure. Especially in the section of cut slope of soil, it is usually necessary to adopt larger structural dimensions and self-weight to ensure that the anti-sliding or anti-overturning stability of the retaining wall meets the design requirements. However, most of the existing gravity retaining walls have the following defects:

[0004] The gravity retaining wall mainly relies on its own weight to meet the requirements of anti-sliding and anti-overturning stability. The wall body has a large size. However, based on durability design, the whole wall body needs to be cast with high-strength concrete, resulting in a low utilization rate of the cross-sectional strength of the concrete wall body and a large waste.

[0005] In the plain area, the sand, gravel materials, rubble or broken stones for making concrete need to be mined in the mountainous area. The long transportation distance causes an increase in material prices and transportation costs, which is not conducive to cost control. The sand, gravel materials, rubble or broken stones will damage the local plants, cause certain pollution to the water body, damage the soil structure and layers, cause soil erosion and reduce the number of organisms during the mining process. Summary of the Invention

[0006] The purpose of the present invention is to provide a design method of a retaining wall containing waste concrete blocks for the technical defects that the gravity retaining wall structure in the prior art has higher material mining and transportation costs and lower utilization rate of the cross-sectional strength of the concrete wall body.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] A design method of a retaining wall containing waste concrete blocks includes the following steps:

[0009] Step 1: Confirm the cross-sectional dimensions of the wall body of the gravity retaining wall to be built and the information of the strength grade of the concrete material;

[0010] Step 2: Calculate the maximum shear bearing capacity of the wall body section of the gravity retaining wall according to the information in Step 1; the maximum shear bearing capacity is represented by [V].

[0011] Step 3: Calculate and determine the maximum shear force V of the wall body section according to the earth pressure stress distribution curve of the backfill soil of the gravity retaining wall to be built.

[0012] Step 4: Calculate and determine the dosage R of waste concrete blocks according to the maximum shear bearing capacity, the maximum shear force of the wall body section and the wall body volume A data of the gravity retaining wall, where R satisfies the following expression:

[0013] R = A(1 - KV / [V]) or R = A(1 - V / [V]) / K;

[0014] where K is a safety factor, K is a constant greater than 1, and the value range of K is 1.5 - 4.

[0015] Step 5: The construction process of the retaining wall containing waste concrete blocks can be guided according to the value of R.

[0016] During the process of carrying out several retaining engineering projects for railway subgrades, the inventor found that for the gravity retaining wall structure, it mainly relies on the self-weight of the wall body to resist the lateral pressure of the backfill soil. According to the existing gravity retaining wall structure, its main structural components are rubble stones, concrete, or integral concrete materials. The earth pressure brought by the backfill soil forms the maximum shear force of the wall body section. Compared with the section shear bearing capacity of the existing retaining wall structure, the maximum shear force of the wall body section is smaller. Through investigation, it is found that for a C30 rubble stone concrete retaining wall with the rubble stone content not exceeding 20%, if the strength of the rubble stones is not considered to participate in shear resistance, the shear bearing capacity of 80% of the concrete wall body is still much greater than the maximum shear force of the section. Therefore, this results in a low utilization rate of the wall body section strength of the gravity retaining wall structure, causing obvious waste, which does not conform to the concept of economic, environmental protection and sustainable development in construction. Therefore, after investigating a large number of different types of gravity retaining wall structures, the inventor proposed a design method for a retaining wall containing waste concrete blocks. Its core idea is to reduce the section shear bearing capacity to a reasonable degree, and on the premise of not affecting the use performance of the gravity retaining wall, improve the utilization rate of the wall body section strength and reduce the construction cost per unit volume of the gravity retaining wall.

[0017] Through a large number of investigations, it is found that the uses of waste concrete cutting materials (including plates or blocks) are generally for cutting plates, cutting bricks, cutting curbstones, and cutting slope protection stones, which coincide with the uses of the rubble materials in gravity retaining walls. The waste concrete cutting materials are convenient to obtain and low in price, which can greatly reduce the masonry cost of gravity retaining walls. Applying waste concrete with a reasonable proportion to replace rubble in the field of gravity retaining walls enables the waste concrete materials to be recycled again, which to a certain extent reduces the consumption of natural building materials, avoids the exploitation of sand and gravel materials, is more conducive to environmental protection and the sustainable utilization of resources, and is more in line with the national sustainable development strategy.

[0018] In the technical solution of the present invention, an expression for determining the dosage R of waste concrete blocks is obtained through research and calculation. By combining this expression with the basic structural data information of the gravity retaining wall, the optimal dosage R value of the waste concrete blocks can be confirmed, so that the finally obtained gravity retaining wall can control the construction cost to a relatively low level without reducing its performance and function. This design method also introduces the concept of renewable utilization into the traditional design field, plays a good exemplary role, and promotes the development of engineering construction towards a more ecological and environmentally friendly direction, having certain social benefits.

[0019] As a preferred technical solution of the present invention, it further includes step 6: designing the longest side dimension L of the waste concrete block according to the wall thickness B of the gravity retaining wall, where L is not greater than B / 3.

[0020] As a preferred technical solution of the present invention, it further includes step 7: determining the minimum protective layer thickness C of the waste concrete block according to the erosion resistance level of the surrounding soil and water environment of the gravity retaining wall and the durability design requirements. The minimum protective layer thickness C is the minimum distance from the waste concrete block to the outer edge of the gravity retaining wall. The value range of C is 3 cm to 10 cm. The minimum distance value of the waste concrete block from the soil side, that is, the minimum protective layer thickness C, is determined according to the erosion resistance level of the surrounding soil and water environment of the gravity retaining wall and the durability requirements. The value of C is positively correlated with the environmental erosion resistance level. When the level is high, C takes a large value; when the level is low, C takes a small value.

[0021] As a preferred technical solution of the present invention, the minimum distance between the waste concrete block at the bottom of the retaining wall and the bottom of the gravity retaining wall is D, and the value range of D is 7 - 10 cm.

[0022] As a preferred technical solution of the present invention, the dosage R of the waste concrete block is determined according to the strength surplus of the wall cross-section.

[0023] In step 2, the strength surplus of the wall cross-section is the difference between the shear bearing capacity of the cross-section and the maximum shear force of the cross-section, that is, [V] - V; the relationship between the strength surplus of the wall cross-section and R is as follows:

[0024] R = A([V] - V) / [V]) = A(1 - V / [V])

[0025] A certain safety reserve needs to be considered in the design. Add a safety factor K to the formula to adjust the R value to a smaller value.

[0026] It is possible to directly divide R by K. At this time, R = A(1 - V / [V]) / K

[0027] It is also possible to reduce the surplus strength of the wall section in the R formula. At this time, R = A([V] - KV) / [V]) = A(1 - KV / [V])

[0028] The value of the said K is determined by the height of the retaining wall. The value of K is positively correlated with the height of the retaining wall. When the height is large, the value of K is larger; when the height is small, the value of K is smaller.

[0029] The shear bearing capacity [V] of the section is calculated and determined according to the section size and the concrete strength grade of the wall body by using existing structural mechanics formulas. The maximum shear force V of the section is calculated and determined according to the soil pressure stress curve on the back of the gravity retaining wall by using existing structural mechanics formulas. Specifically, the value of [V] conforms to the following relational formula: [V] = 0.2fcbh;

[0030] Among them, fc represents the design value of the concrete compressive strength;

[0031] b represents the unit width of the retaining wall; b = 1m;

[0032] h represents the section height, taking the thickness of the retaining wall, with the unit of meter.

[0033] A construction method for a retaining wall containing waste concrete blocks includes the following steps:

[0034] S1: According to the design method of the retaining wall containing waste concrete blocks described in claim 4, determine the numerical value ranges of R, L, C, and D

[0035] value ranges;

[0036] S2: According to the numerical value ranges of R, L, C, and D obtained in S1, prepare waste concrete raw materials and concrete materials;

[0037] Cut the waste concrete raw materials, and the longest side dimension of the cut waste concrete blocks is L;

[0038] S3: Excavate the retaining wall foundation pit and install the wall formwork;

[0039] S4: Pour concrete in layers within the wall formwork and fill with waste concrete blocks in layers. During the filling process, the filling quantity of the waste concrete blocks and the minimum distance value from the waste concrete blocks to the soil side must strictly comply with the numerical ranges in step S1.

[0040] S5: Repeat step S4 until the height of the retaining wall of the designed structure is completed.

[0041] In the technical solution of the present invention, the newly poured concrete of the retaining wall is used to meet the requirements of the wall section strength and durability, and the self-weight of the newly poured concrete and the waste concrete blocks is used to meet the requirements of the wall stability. Through preliminary estimation, the proportion of the waste concrete volume can reach more than 30%, which can effectively utilize waste and avoid resource waste; the acquisition channels of the waste concrete blocks are convenient, and the construction waste in road engineering and building construction projects can be used. The raw material price is cheap, which can effectively save the construction cost; the recycling of waste concrete blocks reduces the consumption of natural building materials and avoids the exploitation of sand and gravel materials, which is beneficial to environmental protection and conforms to the national sustainable development strategy.

[0042] As a preferred technical solution of the present invention, the size range of the cut waste concrete blocks is: the length is 10 - 50 cm; the width is 10 - 50 cm; the height is 5 - 30 cm. The waste concrete blocks are cut into blocks, and the blocks should have regular shapes and no through cracks.

[0043] As a preferred technical solution of the present invention, pour concrete in layers within the formwork and fill with waste concrete blocks in layers. When filling the waste concrete blocks, it should be ensured that the proportion of the concrete in the retaining wall section is not lower than the proportion of the waste concrete blocks in the wall volume, and repeat this process until the top surface of the wall.

[0044] Further preferably, before using the waste concrete blocks, the strength grade of the waste concrete should be determined by core drilling or other methods, and its application range should be determined. The waste concrete blocks with a strength requirement of C25 or above are used.

[0045] A retaining wall structure containing waste concrete blocks, including a retaining wall body. The back soil side of the retaining wall body is in direct contact with the soil slope. The retaining wall body is jointly built by waste concrete blocks and concrete materials. The amount of the waste concrete blocks used, R, satisfies the following expression: R = A(1 - KV / [V]) or R = A(1 - V / [V]) / K; where K is the safety factor, K is a constant, and the value range of K is 1.5 - 4.

[0046] The bottom of the retaining wall body has a concrete base layer, and the thickness D range of the concrete base layer is 7 - 10 cm.

[0047] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0048] In the technical solution of the present invention, an expression for determining the dosage R of waste concrete blocks is obtained through research and calculation. By combining this expression with the basic structural data information of the gravity retaining wall, the optimal value of the dosage R of waste concrete blocks can be confirmed, so that the final obtained gravity retaining wall can control the construction cost to a relatively low level without reducing its performance and function. This design method also introduces the concept of renewable utilization into the traditional design field, plays a good demonstration role, and promotes the development of engineering construction towards a more ecological and environmentally friendly direction, having certain social benefits.

[0049] By using waste concrete blocks to replace rubble stones for the masonry of gravity retaining walls, it replaces conventional sand and gravel materials, rubble or rubble stones, reducing the price cost and transportation cost increased by using the above materials; the local plants will be damaged, the water body will be polluted to a certain extent, the soil structure and layers will be damaged, soil erosion will occur and the number of organisms will decrease during the mining process of sand and gravel materials, rubble or rubble stones. By replacing with waste concrete blocks, the reuse of waste concrete blocks is realized, and at the same time, the damage to the environment can be avoided to a certain extent.

[0050] In the technical solution of the present invention, the newly poured concrete of the retaining wall is used to meet the requirements of the wall section strength and durability, and the self-weight of the newly poured concrete and waste concrete blocks is used to meet the requirements of the wall stability. After estimation, the proportion of the waste concrete volume can reach more than 30%, which can effectively utilize waste and avoid waste of resources; the acquisition channels of waste concrete blocks are convenient, the construction waste in road engineering and building construction projects can be used, and the raw material price is cheap, which can effectively save the construction cost; the recycling of waste concrete blocks reduces the consumption of natural building materials and avoids the exploitation of sand and gravel materials, which is beneficial to environmental protection and conforms to the national sustainable development strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic structural diagram of the retaining wall of waste concrete blocks in the present invention.

[0052] Reference numerals: 1 - retaining wall body, 2 - soil slope surface, 3 - waste concrete block, 4 - concrete material, 5 - concrete base layer, 6 - concrete base layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] The present invention will be described in detail below with reference to the drawings.

[0054] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0055] Embodiment 1

[0056] Embodiment 1 provides a retaining wall containing waste concrete blocks, including a retaining wall body 1. The backfill side of the retaining wall body 1 is in direct contact with the soil slope 2. The retaining wall body is jointly constructed by waste concrete blocks 3 and concrete materials 4. The dosage R of the waste concrete blocks 3 satisfies the following expression: R = A(1 - KV / [V]) or R = A(1 - V / [V]) / K; where K is a safety factor, K is a constant, and the value range of K is 1.5 - 4.

[0057] Among them, the dosage R of the waste concrete blocks 3 is determined according to the strength surplus of the wall cross-section. Specifically, the design method includes the following steps:

[0058] Step 1: Confirm the cross-section size of the gravity retaining wall to be constructed and the information of the concrete material strength grade; the height of the retaining wall is 6 meters, the thickness of the wall is 1.96 meters, the volume of each linear meter of the retaining wall body is 11.76 cubic meters, and the concrete material strength of the wall is C25 concrete.

[0059] Step 2: Calculate the maximum shear bearing capacity of the cross-section of the gravity retaining wall according to the information in Step 1; the maximum shear bearing capacity is represented by [V]; the cross-section shear bearing capacity [V] is calculated and determined by using existing structural mechanics formulas according to the cross-section size and the wall body concrete strength grade. Specifically, the value of [V] conforms to the following relationship: [V] = 0.2fcbh; where fc represents the design value of concrete compressive strength, which is 11.9 N / mm² for C25 concrete; b represents the unit width of the retaining wall, taken as 1 meter; h represents the cross-section height, taken as the thickness of the retaining wall, which is 1.96 meters.

[0060] [V] = 0.2fcbh = 466.48 kN

[0061] Step 3: Calculate and determine the maximum shear force V of the cross-section according to the soil pressure stress distribution curve on the back of the gravity retaining wall to be constructed, which is the resultant force of the soil pressure on the back of the retaining wall. In this embodiment, the resultant force of the soil pressure on the back of the gravity retaining wall is 144.76 kN, and the maximum shear force of the cross-section is 144.76 kN.

[0062] Step 4: Calculate and determine the dosage R of the waste concrete blocks according to the maximum shear bearing capacity, the maximum shear force of the cross-section, and the data of the volume A of the wall body of the gravity retaining wall. Among them, R satisfies the following expression:

[0063] R = A(1 - KV / [V]) or R = A(1 - V / [V]) / K;

[0064] Where K is a safety factor, K is a constant, and the value range of K is 1.5 - 4. The value of K is determined by the height of the retaining wall. The value of K is positively correlated with the height of the retaining wall. When the height is large, the value of K is larger; when the height is small, the value of K is smaller.

[0065] In this embodiment, it is calculated by the formula R = A(1 - V / [V]) / K. What is the value of K? It is 2.0. The wall volume A of the gravity retaining wall with a unit length of 1 meter is 11.76 cubic meters.

[0066] R = A(1 - V / [V]) / K = 11.76(1 - 144.76 / 466.48) / 2 = 4.1 cubic meters

[0067] Step 5: The construction process of the retaining wall containing waste concrete blocks can be guided according to the R value.

[0068] According to the wall thickness B of the gravity retaining wall being 1.96 meters, the longest side dimension L of the waste concrete block is designed. Among them, L is not greater than B / 3, that is, the longest side dimension L is not greater than 0.65m.

[0069] According to the erosion level of the surrounding soil and water environment of the gravity retaining wall being T1, the minimum cover thickness of the waste concrete block is determined in combination with the durability design requirements. The value range of C is 3cm to 10cm. The minimum distance value of the waste concrete block from the soil side, that is, the minimum cover thickness C, is determined according to the erosion level of the surrounding soil and water environment of the gravity retaining wall and the durability requirements. The value of C is positively correlated with the environmental erosion level. When the level is high, C takes a large value; when the level is low, C takes a small value. In this embodiment, the erosion level is T1, and the value of C is 3cm.

[0070] The minimum distance between the waste concrete block at the bottom of the retaining wall and the bottom of the gravity retaining wall is D. The value range of D is 7 - 10cm. Using the concrete base layer 6 at the bottom can increase the stability of the retaining wall.

[0071] In this embodiment, the wall material per meter is 7.6 cubic meters of C25 concrete + 4.1 cubic meters of waste concrete blocks, and the estimated material price is 2608 yuan; the wall material of the traditional retaining wall per meter is 11.76 cubic meters of C25 concrete, and the estimated material price is 3528 yuan. This embodiment saves about 26% in cost compared with the traditional retaining wall.

[0072] For the retaining wall containing waste concrete blocks in this embodiment, it overcomes the problem that the utilization rate of the cross-section strength of the wall body of the gravity retaining wall structure in the prior art is relatively low, resulting in obvious waste. After investigating a large number of different types of gravity retaining wall structures, the inventor proposed a design method for a retaining wall containing waste concrete blocks. Its core concept is to improve the utilization rate of the cross-section strength of the wall body and reduce the construction cost per unit volume of the gravity retaining wall without affecting the service performance of the gravity retaining wall by reducing the shear bearing capacity of the cross-section to a reasonable degree.

[0073] Through a large number of investigations, it is found that the uses of waste concrete cutting materials (including plates or blocks) are generally for cutting plates, cutting bricks, cutting curbstones, and cutting slope protection stones, which coincide with the uses of the rubble materials in gravity retaining walls. The waste concrete cutting materials are convenient to obtain and low in price, which can greatly reduce the masonry cost of gravity retaining walls. Applying waste concrete with a reasonable proportion to replace rubble in the field of gravity retaining walls enables the waste concrete materials to be recycled again. To a certain extent, this reduces the consumption of natural building materials, avoids the exploitation of sand and gravel, is more conducive to environmental protection and the sustainable use of resources, and is more in line with the national sustainable development strategy.

[0074] Example 2

[0075] This example discloses a construction method for a retaining wall containing waste concrete blocks. Among them, the retaining wall has the structure in Example 1. The method includes the following steps:

[0076] S1: According to the design method of the retaining wall containing waste concrete blocks described above, determine the numerical ranges of R, L, C, and D;

[0077] S2: According to the numerical ranges of R, L, C, and D obtained in S1, prepare waste concrete raw materials and concrete materials; cut the waste concrete raw materials, and the maximum side dimension of the waste concrete blocks obtained by cutting is L. Specifically, the size range of the waste concrete blocks obtained by cutting is: the length is 10 - 65 cm; the width is 10 - 50 cm; the height is 10 - 30 cm. The waste concrete blocks 3 are cut into blocks, and the blocks should have regular shapes and no through cracks.

[0078] S3: Excavate the foundation pit of the retaining wall and install the wall formwork;

[0079] S4: Pour concrete in layers and fill waste concrete blocks in layers within the wall formwork. During the filling process, the filling amount of the waste concrete blocks and the minimum distance value from the waste concrete blocks to the soil side strictly comply with the numerical ranges in step S1; before using the waste concrete blocks, the strength grade of the waste concrete should be determined by core drilling or other methods, and its application range should be determined. Waste concrete blocks with a strength requirement of C25 or above are used.

[0080] S5: Repeat step S4 until the height of the retaining wall with the designed structure is completed.

[0081] The volume proportion R of the waste concrete blocks in the retaining wall of this example is 4.1 / 11.76 = 34.8%.

[0082] In the technical solution of this embodiment, by using waste concrete blocks to replace rubble stones for the masonry of gravity retaining walls, the consumption of C25 concrete materials is reduced by 34.8%. Compared with the retaining wall structure of the prior art, the final construction material cost is reduced by 26%.

[0083] An expression for determining the dosage R of waste concrete blocks is obtained through research and calculation. By combining this expression with the basic structural data information of the gravity retaining wall, the optimal dosage R value of the waste concrete blocks can be confirmed, so that the construction cost of the finally obtained gravity retaining wall can be controlled at a relatively low level without reducing its performance and function. This design method also introduces the concept of renewable utilization into the traditional design field, plays a good exemplary role, and promotes the development of engineering construction towards a more ecological and environmentally friendly direction, with certain social benefits.

[0084] By using waste concrete blocks to replace rubble stones for the masonry of gravity retaining walls, the conventional sand and gravel materials, rubble stones or boulders are replaced, reducing the price cost and transportation cost increased by using the above materials; the local plants will be damaged, the water body will be polluted to a certain extent, the soil structure and layers will be damaged, soil erosion will occur and the number of organisms will decrease during the mining process of sand and gravel materials, rubble stones or boulders. By replacing with waste concrete blocks, the reuse of waste concrete blocks is realized, and at the same time, the damage to the environment can be avoided to a certain extent.

[0085] The above is only the preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A design method for a retaining wall containing waste concrete blocks, characterized in that, It includes the following steps: Step 1: Confirm the cross-sectional dimensions of the wall body of the gravity retaining wall to be built and the information on the strength grade of the concrete material; Step 2: Calculate the maximum shear bearing capacity of the cross-section of the wall body of the gravity retaining wall according to the information in Step 1; the maximum shear bearing capacity is represented by [V]; Step 3: Calculate and determine the maximum shear force V of the wall body cross-section according to the soil pressure stress distribution curve of the back of the gravity retaining wall to be built; Step 4: Calculate and determine the dosage R of waste concrete blocks according to the maximum shear bearing capacity, the maximum shear force of the wall body cross-section and in combination with the data of the wall body volume A of the gravity retaining wall, where R satisfies the following expression: R = A(1 - KV / [V]) or R = A(1 - V / [V]) / K; Where K is the safety factor, K is a constant greater than 1, the value range of K is 1.5 - 4, the value of K is determined by the height of the retaining wall, the value of K is positively correlated with the height of the retaining wall, when the height is large, the value of K is larger, and when the height is small, the value of K is smaller; Step 5: The construction process of the retaining wall containing waste concrete blocks can be guided according to the R value; Step 6: Design the longest side dimension L of the waste concrete block according to the wall body thickness B of the gravity retaining wall, where L is not greater than B / 3; Step 7: Determine the minimum cover thickness C of the waste concrete block according to the erosion resistance grade of the surrounding soil and water environment of the gravity retaining wall and the durability design requirements. The minimum cover thickness C is the minimum distance from the waste concrete block to the outer edge of the gravity retaining wall, and the value range of C is 3 cm to 10 cm; The minimum distance between the waste concrete block at the bottom of the retaining wall and the bottom of the gravity retaining wall is D, and the value range of D is 7 - 10 cm.

2. The design method of the retaining wall containing waste concrete blocks according to claim 1, characterized in that, The dosage R of the waste concrete block is determined according to the strength surplus of the wall body cross-section.

3. A construction method for a retaining wall containing waste concrete blocks, characterized in that It includes the following steps: S1: According to the design method of the retaining wall containing waste concrete blocks described in Claim 2, determine the numerical ranges of R, L, C and D; S2: According to the numerical ranges of R, L, C and D obtained in S1, prepare waste concrete raw materials and concrete materials; Cut the waste concrete raw materials, and the longest side dimension of the cut waste concrete blocks is L; S3: Excavate the foundation pit of the retaining wall and install the wall formwork; S4: Pour concrete in layers and fill waste concrete blocks in layers within the wall formwork. During the filling process, the filling amount of the waste concrete blocks and the minimum distance value from the waste concrete blocks to the soil side strictly comply with the numerical ranges in Step S1; S5: Repeat Step S4 until the height of the retaining wall of the designed structure is completed.

4. The construction method of the retaining wall containing waste concrete blocks according to claim 3, characterized in that, The size range of the cut waste concrete blocks is: the length is 10 - 50 cm; the width is 10 - 50 cm; the height is 5 - 30 cm.

5. A retaining wall containing waste concrete blocks, characterized in that, The retaining wall is designed according to the design method described in any one of Claims 1 - 2 and is built by the construction method described in any one of Claims 3 - 4.

6. The retaining wall containing waste concrete blocks according to claim 5, characterized in that, It includes a retaining wall body. The backfill side of the retaining wall body is in direct contact with the soil slope. The retaining wall body is jointly constructed by waste concrete blocks and concrete materials. The dosage R of the waste concrete blocks satisfies the following expression: R = A(1 - KV / [V]) or R = A(1 - V / [V]) / K; where K is a safety factor, K is a constant, and the value range of K is 1.5 - 4.

7. The retaining wall containing waste concrete blocks according to claim 6, characterized in that, The bottom of the retaining wall body has a concrete base layer, and the thickness D of the concrete base layer ranges from 7 to 10 cm.

Images