A method for improving the anti-sliding stability of rock foundation buildings

Abstract

The present invention relates to the technical field of hydraulic engineering, and specifically provides a method for improving the anti-slip stability of rock foundation buildings, which includes rubber concrete. By adjusting the dosage of rubber powder in the rubber concrete at different positions at the bottom of the rock foundation building, it is possible to reduce or eliminate the stress concentration at the bottom edge of the rock foundation, and improve the shear strength and shear friction coefficient of the rock foundation building. The composition of the rubber concrete includes waste rubber powder, cement, fly ash, mineral powder, sand, gravel and water, and the dosage of the rubber powder in the concrete is 5-50 kg / m<supgt;3< / supgt;. The present invention reduces or eliminates the stress concentration at the bottom edge of the rock foundation by incorporating different proportions of rubber powder at different positions at the bottom of the rock foundation building, thereby increasing the shear friction coefficient and improving the shear strength of the rock foundation building, and effectively enhancing the anti-slip stability of the rock foundation building, avoiding the problems of need for rock chiseling or the construction technology using an inclination angle during the construction process.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy engineering, and particularly to a method for improving the anti-slip stability of rock-based buildings. Background Technique

[0002] Gravity buildings built on rock foundations may, under various loads, cause phenomena such as sliding and overturning of the buildings. Stress concentration occurs at the bottom edge of the rock-based buildings, cracks are likely to appear, the shear strength of the buildings decreases, the friction coefficient decreases, and the anti-slip stability decreases. Therefore, anti-slip stability plays a key control role in the durability design of the buildings.

[0003] The shear strength between the rock foundation and concrete is a key parameter for the stability design of buildings such as dams and sluices, directly affecting the project quantity and construction period of foundation treatment, and even affecting the building form and hub layout. Gravity buildings located on rock foundations rely on the friction force between the rock foundation and the contact surface of the large-volume concrete to balance the huge water pressure. With a very small change in the friction coefficient of the contact surface, a large change in the volume of concrete is required to keep the friction force unchanged, resulting in a large difference in project cost.

[0004] Currently, the main technologies for increasing the friction coefficient between concrete and the rock foundation are to chisel teeth on the rock foundation or adopt the method of inclined angles, but this will significantly increase the construction cost. Therefore, how to reduce the horizontal water pressure and increase the friction coefficient of the rock-based building is the key to improving the anti-slip stability and is of great significance to engineering safety. Therefore, there is an urgent need for a method for improving the anti-slip stability of rock-based buildings to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for improving the anti-slip stability of rock-based buildings to solve the problem in the above background technique that the main current technologies for increasing the friction coefficient between concrete and the rock foundation are to chisel teeth on the rock foundation or adopt the method of inclined angles, but this will significantly increase the construction cost.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A method for improving the anti-slip stability of rock-based buildings, including rubber concrete;

[0007] Adjust the dosage of rubber powder in the rubber concrete at different positions at the bottom of the rock-based building to reduce or eliminate stress concentration at the bottom edge of the rock foundation and improve the shear strength and shear friction coefficient of the rock-based building.

[0008] The method is as follows:

[0009] S1. Obtain the magnitude of the distance value from the central position O of the rock-based building to the edge B position of the rock-based building;

[0010] S2. Calculate the size of the distance from the central position O of the rock foundation building to the edge position B, which is 60% of the distance to point A.

[0011] S3. According to the size of the A - B distance value obtained in S2, control the rubber powder content in the rubber concrete at different positions in the rock foundation building;

[0012] S4. Prepare rubber concrete with different rubber powder contents according to different amounts of rubber powder used;

[0013] S5. Classify the prepared rubber concrete and classify it in ascending order of rubber powder content;

[0014] S6. Use the concretes with increasing content in turn from the A - B part of the rock foundation building to complete the construction.

[0015] Preferably, the composition of the rubber concrete includes: waste rubber powder, cement, fly ash, mineral powder, sand, gravel and water.

[0016] Preferably, the rubber powder content in the concrete is 5 - 50 kg / m³.

[0017] Preferably, when approaching the central position of the rock foundation building, the rubber powder content in the used rubber concrete decreases in turn.

[0018] Preferably, when far from the central position of the rock foundation building, the rubber powder content in the rubber concrete increases in turn.

[0019] Preferably, the production method of the rubber concrete is as follows, and its steps are:

[0020] S1: Weigh cement, fly ash, mineral powder, sand, gravel and water by weight parts, and convey the obtained raw materials into the mixing device for mixing to obtain mixture A;

[0021] S2: According to the size of the A - B position distance value in the rock foundation building, determine the rubber powder content and the amount of rubber concrete in different rubber concretes;

[0022] S3: Discharge the obtained mixture A from the mixing device, and convey the obtained mixture A to multiple groups of metering barrels in turn through the conveying device;

[0023] S4: Add 5 - 50 kg / m³ of waste rubber powder to the mixture A in multiple groups of metering barrels respectively according to the concentration at the use position through the feeding device;

[0024] S5: Stir the mixture with the corresponding content of rubber powder again through the mixing device to make it fully mixed;

[0025] S6: Complete the production of rubber concrete.

[0026] Preferably, the mixing time of the mixture A is 15 seconds, and the mixing time after adding waste rubber powder is 20 seconds.

[0027] Preferably, the waste rubber powder is 30 - 60 mesh.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The method for improving the anti-slip stability of rock foundation buildings is provided with rubber powder. With this design, the invention reduces or eliminates the stress concentration at the bottom edge of the rock foundation by incorporating different proportions of rubber powder at different positions at the bottom of the rock foundation building, thereby increasing the shear friction coefficient and shear strength of the rock foundation building, avoiding the problems of need for rock tooth chiseling or the construction technology using inclined angles during the construction process, effectively saving the project cost, improving the construction efficiency, and the overall scheme is relatively simple and easy to implement. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the rock foundation building of the present invention;

[0031] Figure 2 It is a schematic structural diagram of the rubber powder dosage distribution of the present invention;

[0032] Figure 3 It is a schematic diagram of the stress distribution at the bottom of the building of the rock foundation construction of the present invention using ordinary concrete;

[0033] Figure 4 It is a schematic diagram of the stress distribution at the bottom of the building of the rock foundation construction of the present invention using rubber powder concrete;

[0034] Figure 5 It is a schematic diagram of the distribution of rubber concrete at the bottom of the rock foundation building of the present invention. Detailed Embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] Please refer to Figures 1-5 , an embodiment provided by the present invention: A method for improving the anti-slip stability of rock foundation buildings, including rubber concrete;

[0037] Adjust the dosage of rubber powder in rubberized concrete at different positions at the bottom of rock - based buildings to reduce or eliminate stress concentration at the bottom edge of the rock foundation, and improve the shear strength and shear friction coefficient of the rock - based building. Using this design facilitates enhancing the shear strength and shear friction coefficient of the rock - based building by adding rubber powder, thereby meeting the construction requirements of the rock - based building. This design is adopted because rubber powder has a certain elasticity and can absorb stress (load), so rubberized concrete has the function of redistributing the stress at the bottom of the rock - based building. The magnitude of the stress dispersed by rubberized concrete is related to the dosage of rubber powder in the concrete. The larger the dosage of rubber powder, the stronger the stress - dispersing effect.

[0038] Furthermore, the method is as follows:

[0039] S1. Obtain the magnitude of the distance value from the central position of the rock - based building to the edge position B of the rock - based building;

[0040] S2. Calculate the distance point A, which is 60% of the distance from the central position O of the rock - based building to the edge position B.

[0041] S3. According to the magnitude of the A - B distance value obtained in S1, control the dosage of rubber powder in rubberized concrete at different positions in the rock - based building;

[0042] S4. Prepare rubberized concrete with different rubber powder contents according to different usage amounts of rubber powder;

[0043] S5. Classify the prepared rubberized concrete and classify it in ascending order of the dosage of rubber powder;

[0044] S6. Use the concrete with increasing dosages in sequence from the B - C part of the rock - based building to complete the construction.

[0045] Furthermore, the composition of the rubberized concrete includes: waste rubber powder, cement, fly ash, mineral powder, sand, gravel and water.

[0046] It can be known from the attached Figure 2 It can be known that stress concentration begins to occur at 60% of the distance from the center position of the rock - based building. The farther away from the center, the stress gradually increases until the edge.

[0047] Furthermore, the dosage of rubber powder in the concrete is 5 - 50 kg / m³. Using this design facilitates determining the amount of rubber powder used.

[0048] Further, the closer to the rock foundation building B, the increasing dosage of rubber powder in the rubberized concrete. This design is due to the stress field distribution at the bottom of the rock foundation building. At 60% of the distance from the center of the rock foundation building, the stress begins to increase, and the stress gradually increases as the distance from the center gets farther. Therefore, the dosage of rubber powder in the rubberized concrete should also increase accordingly to eliminate the corresponding stress.

[0049] Further, the farther away from the rock foundation building B, the decreasing dosage of rubber powder in the rubberized concrete. This design facilitates the further determination of the distribution of the rubberized concrete and subsequent construction.

[0050] Further, the production method of the rubberized concrete is as follows:

[0051] S1: Weigh cement, fly ash, slag powder, sand, gravel and water by weight, and convey the obtained raw materials into the mixing device for mixing to obtain mixture A.

[0052] S2: Determine the dosage of different rubber powders and the amount of rubberized concrete according to the distance value between positions B and C in the rock foundation building.

[0053] S3: Discharge the obtained mixture A from the mixing device, and convey the obtained mixture A into multiple groups of metering barrels through the conveying device in sequence.

[0054] S4: Add 5 - 50 kg / m³ of waste rubber powder to the mixture A in multiple groups of metering barrels respectively according to the concentration at the usage position through the feeding device in sequence.

[0055] S5: Stir the mixture with the corresponding content of rubber powder again through the mixing device to make it fully mixed.

[0056] S6: Complete the production of the rubberized concrete.

[0057] Further, the mixing time of mixture A is 15 seconds, and the mixing time after adding waste rubber powder is 20 seconds. This design facilitates more uniform mixing and fully mixing of the raw materials.

[0058] Further, the waste rubber powder is 30 - 60 mesh. The waste rubber powder is a powdery material made from waste rubber products such as waste tires through crushing and processing. The rubber powder with a certain fineness specification is 30 - 60 mesh. This design facilitates its production from waste rubber, making the overall production cost lower and avoiding waste of waste rubber.

[0059] Refer to the attached instruction manual Figure 4 and attached Figure 5It can be clearly concluded that by adjusting the dosage of rubber powder in rubberized concrete at different positions at the bottom of rock foundation buildings, the phenomenon of stress concentration at the bottom edge of the rock foundation can be reduced and eliminated.

[0060] Refer to the attached instruction manual Figure 5 , where B-D is the height of rubberized concrete, O-A is the ordinary concrete area, Cn and Cn+1 are the mixing ratio interval points of the rubber powder dosage. The rubber powder dosage in the rubberized concrete in the area A-Cn is M Kg / m³, where M is greater than or equal to 5. The rubber powder dosage in the rubberized concrete in the area Cn-Cn+1 is N Kg / m³, where N is greater than M. The rubber powder dosage in the rubberized concrete in the area Cn+1 is W Kg / m³, where W is greater than N, thus facilitating the further confirmation of the distribution of rubber powder concrete. Example

[0061] During the reinforcement of a certain reservoir flood discharge sluice, rubberized concrete was started to be set at a distance of 3 m from the center position of the sluice floor, and the rubber powder dosage in the concrete was 15 kg / m 3 ; in the concrete at a distance of 5 m from the center position of the sluice floor, the rubber powder dosage was 20 kg / m 3 ; in the concrete at the edge of the sluice floor, the rubber powder dosage was 30 kg / m 3 ;

[0062] In the on-site shear test, the shear friction coefficient of the rock foundation concrete was 1.286, and the sliding friction coefficient was 1.084; compared with ordinary concrete, they were increased by 163.8% and 158.0% respectively; Example

[0063] During the reinforcement of a certain reservoir check sluice, rubberized concrete was started to be set at a distance of 2 m from the center position of the sluice floor, and the rubber powder dosage in the concrete was 5 kg / m 3 ; in the concrete at a distance of 3 m from the center position of the sluice floor, the rubber powder dosage was 10 kg / m 3 ; in the concrete at the edge of the sluice floor, the rubber powder dosage was 20 kg / m 3 ;

[0064] In the on-site shear test, the shear friction coefficient of the rock foundation concrete was 1.150, and the sliding friction coefficient was 1.052; compared with ordinary concrete, they were increased by 145.6% and 153.4% respectively. Example

[0065] During the reinforcement of a certain reservoir drainage sluice, rubberized concrete was started to be set at a distance of 2 m from the center position of the sluice floor, and the rubber powder dosage in the concrete was 5 kg / m 3 ; in the concrete at the edge of the sluice floor, the rubber powder dosage was 10 kg / m 3 ;

[0066] In the in-situ shear test, the shear friction coefficient of the rock foundation concrete is 0.817, and the sliding friction coefficient is 0.703. Compared with ordinary concrete, they are increased by 103.4% and 102.5% respectively.

[0067] Working principle: Determine the raw materials through weighing and proportioning, then stir the raw materials by a stirring device to obtain concrete. Subsequently, according to the usage location of the concrete, add rubber powder into the stirred concrete and stir again to obtain rubber concrete with different rubber powder concentrations. Then, use the concrete with gradually increasing rubber powder content for construction from the center to the outside of the rock foundation building in sequence.

[0068] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A method for improving the anti-sliding stability of rock foundation buildings, characterized in that Including: Rubber concrete; Adjust the dosage of rubber powder in rubber concrete at different positions at the bottom of the rock foundation building to reduce or eliminate the stress concentration at the bottom edge of the rock foundation and improve the shear strength and shear friction coefficient of the rock foundation building; The method is as follows: S1. Obtain the distance value from the central position O of the rock foundation building to the edge position B of the rock foundation building; S2. Calculate the distance point A, which is 60% of the distance from the central position O of the rock foundation building to the edge position B; S3. Control the dosage of rubber powder in rubber concrete at different positions in the rock foundation building according to the distance value from A to B obtained in S2; S4. Prepare rubber concrete with different rubber powder contents according to different usage amounts of rubber powder; S5. Classify the prepared rubber concrete and classify it in ascending order of the dosage of rubber powder; S6. Use the concrete with increasing dosage in turn from the position A to B in the rock foundation building to complete the construction; The dosage of rubber powder in the concrete is 5 - 50 kg / m³; The closer to the position B of the rock foundation building, the dosage of rubber powder in the rubber concrete used increases in turn; The farther away from the position B of the rock foundation building, the dosage of rubber powder in the rubber concrete decreases in turn.

2. A method for improving the anti-sliding stability of rock foundation buildings according to claim 1, characterized in that: The composition of the rubber concrete includes waste rubber powder, cement, fly ash, mineral powder, sand, gravel and water.

3. A method for improving the anti-slip stability of a rock foundation building according to claim 2, characterized in that, The production method of the rubber concrete is as follows, and the steps are: S1. Weigh cement, fly ash, mineral powder, sand, gravel and water by weight, and convey the obtained raw materials into the mixing device for mixing to obtain mixture A; S2. Determine the dosage of different rubber powders in the rubber concrete and the usage amount of the rubber concrete according to the distance value from the position A to B in the rock foundation building; S3. Discharge the obtained mixture A from the mixing device and convey the obtained mixture A into multiple groups of metering barrels in turn through the conveying device; S4. Add 5 - 50 kg / m³ of waste rubber powder to the mixture A in multiple groups of metering barrels respectively through the feeding device according to the dosage of rubber powder at the usage position; S5. Stir the mixture with the corresponding content of rubber powder again through the mixing device to make it fully mixed; S6. Complete the production of rubber concrete.

4. A method for improving the anti-sliding stability of a rock foundation building according to claim 3, characterized in that: The mixing time of the mixture A is 15 seconds, and the mixing time after adding waste rubber powder is 20 seconds.

5. A method for improving the anti-sliding stability of a rock foundation building according to claim 2, characterized in that: The waste rubber powder is 30 - 60 mesh.

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