Pumped storage power station excavation material comprehensive utilization method based on cementing technology

Abstract

The invention discloses a pumped storage power station excavation material comprehensive utilization method based on a cementing technology, which comprises the following steps: S1, preliminarily determining an applicable dam type according to positions and geological conditions of upper and lower reservoirs of a pumped storage power station; s2, classification and quantity estimation are carried out by combining various excavation materials of a project; s3, structural design is conducted, specifically, dam design is conducted based on various excavation materials according to the following principle; s4, combined dam body design is conducted according to the pre-estimation of the type and the number of the excavation materials and the principle of the step S3, and the stability and the stress of the dam body are analyzed; according to the method, various engineering excavation materials can be efficiently and fully utilized, and green and efficient comprehensive utilization is achieved on the basis of excavation material utilization modes, formed material performance and adaptive structures for various excavation materials of the pumped storage power station.

Description

Technical Field

[0001] The invention relates to the technical field of pumped storage power station construction, in particular to a method for comprehensive utilization of excavated materials of a pumped storage power station based on a cementation technology. Background Art

[0002] In the construction of pumped storage power stations, diversion tunnels are essential and vital water diversion structures, which often need to be constructed by excavating rock mass. Using excavated stone for the construction of dams and various structures and structures of pumped storage power stations is the most common application method for environmental protection and economic considerations. In addition to the excavated stone produced by the construction of diversion tunnels, excavated stone, gravel, and earth and stone materials such as foundations and slopes will also be produced during the construction of upper and lower reservoirs. Various excavated materials are often not effectively and fully applied due to their type, quality, and quantity. Sometimes they are treated as waste slag because they cannot be used, and sometimes they need to be selected from other material yards to mine the required raw materials due to insufficient quantity. These directly increase the environmental burden and construction cost of engineering construction. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a method for comprehensive utilization of excavated materials of pumped-storage power stations based on bonding technology. For various excavated materials of pumped-storage power stations, starting from the utilization method of excavated materials, the properties of the formed materials and the structures to which they are adapted, green and efficient comprehensive utilization is achieved.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for comprehensive utilization of excavated materials of a pumped storage power station based on cementation technology, which comprises the following steps: S1. Preliminarily determine the applicable dam type based on the location and geological conditions of the upper and lower reservoirs of the pumped storage power station; S2. Classify and estimate the quantity of various excavated materials in combination with the project; S3. Structural design: The dam design is carried out based on various excavated materials according to the following principles: S3.1. When the foundation conditions allow the construction of a rigid dam and the amount of hard rock obtained through excavation can meet the engineering requirements of various types of concrete dams, rockfill concrete dams, roller-compacted concrete dams or normal concrete dams shall be given priority; S3.2. When the amount of hard rock in the excavated material is insufficient to construct a concrete dam, a composite dam design shall be carried out according to the type and amount of excavated material; S4. Based on the estimated type and quantity of excavated materials, the combined dam body is designed according to the principles of step S3, and the stability and stress of the dam body are analyzed.

[0005] Preferably, in step S1, the applicable dam types preliminarily determined include: roller compacted earth-rock dam, face rockfill dam, cemented gravel dam, concrete dam, roller compacted concrete dam, rockfill concrete dam, and cemented rockfill dam.

[0006] Preferably, in step S2, various excavated materials are utilized as follows: (1) Hard rock, used for all dam types, with priority given to concrete-related dam types; (2) Soft rock, used for rolled earth-rock dams, face rockfill dams, and cemented rockfill dams; (3) Sand and gravel, used for cementing sand and gravel dams; (4) Earth and rock materials: used for compacting earth-rock dams and covering green areas.

[0007] Preferably, in step S3.1, the excavated materials are utilized as follows: large stones with a particle size of 150 mm and above are used as rockfill in the form of a rockfill concrete dam; particles below 150 mm are used to process coarse and fine aggregates and stone powder required for concrete, which are used for self-compacting concrete, roller-compacted concrete or normal concrete; the remaining soil and stone materials are used as soil covering behind the dam for ecological greening.

[0008] Preferably, in step S3.2, a concrete anti-seepage area is set on the upstream surface, using normal concrete or self-compacting concrete; the upstream area is set as the core area of ​​the dam body, using one or more combinations of rockfill concrete, roller-compacted concrete, normal concrete, cemented rockfill, and cemented gravel.

[0009] Preferably, in step S3.2, the upstream and downstream surface slope ratio (height: width) of the concrete dam is vertical to 1:0.80, and the downstream surface slope ratio (height: width) of the cemented rockfill dam and cemented rockfill dam is 1:0.5 to 1:1; the middle and downstream areas are low stress areas of the dam body, and various types of rolled earth-rock dams are used, and the downstream surface slope ratio (height: width) is 1:1 to 1:2.

[0010] Preferably, in step S4, for various concrete, cemented rockfill, and cemented gravel dam bodies adjacent to the upstream side, the stability of each foundation surface and each layer and the stress conditions of the main parts are analyzed as a whole according to the rigid body limit equilibrium method and material mechanics method or the finite element method, and the calculation parameters are taken separately for different materials, and the rockfill or earth-rock body in the middle and lower parts are considered as the downstream side load; the stability and stress analysis of the rockfill and earth-rock dam body adjacent to the middle and lower parts is carried out according to the design method of earth-rock dam.

[0011] Beneficial effects of the invention: The invention can fully and efficiently utilize various engineering excavation materials. It aims at various excavation materials of pumped storage power stations, and realizes green and efficient comprehensive utilization from the perspective of the utilization mode of the excavation materials, the properties of the formed materials and the structures to which they are adapted. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the cross-sectional view of the combined dam design. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Embodiment 1: A method for comprehensive utilization of excavated materials of a pumped storage power station based on cementation technology, comprising the following steps: S1. Based on the location and geological conditions of the upper and lower reservoirs of the pumped storage power station, preliminarily determine the applicable dam types; including: roller-compacted earth-rock dam, face rockfill dam, cemented gravel dam, concrete dam, roller-compacted concrete dam, rockfill concrete dam, and cemented rockfill dam.

[0015] S2. Classify and estimate the quantity of various excavated materials in combination with the project; the utilization methods of various excavated materials are as follows: (1) Hard rock, used for all dam types, with priority given to concrete-related dam types; (2) Soft rock, used for rolled earth-rock dams, face rockfill dams, and cemented rockfill dams; (3) Sand and gravel, used for cementing sand and gravel dams; (4) Earth and rock materials: used for compacting earth-rock dams and covering green areas.

[0016] S3. Structural design: The dam design is carried out based on various excavated materials according to the following principles: S3.1. When the foundation conditions allow the construction of a rigid dam and the amount of hard rock obtained through excavation can meet the engineering volume of various types of concrete dams, priority shall be given to rockfill concrete dams, roller-compacted concrete dams or normal concrete dams; the excavated materials shall be utilized as follows: large stones with a particle size of 150 mm and above shall be used as rockfill in the form of rockfill concrete dams; particles below 150 mm shall be used to process the coarse and fine aggregates and stone powder required for concrete, and used in self-compacting concrete, roller-compacted concrete or normal concrete; the remaining soil and stone materials shall be used as soil covering behind the dam for ecological greening.

[0017] S3.2. When the amount of hard rock in the excavated material is insufficient to build a concrete dam, a combined dam design shall be carried out according to the type and amount of excavated material; a concrete type anti-seepage area shall be set up on the upstream face, using normal concrete or self-compacting concrete; the upstream area shall be set up as the core area of ​​the dam body, using one or more combinations of rockfill concrete, roller compacted concrete, normal concrete, cemented rockfill, and cemented gravel. The upstream and downstream slope ratios (height: width) of the concrete dam shall be vertical to 1:0.80, and the downstream slope ratios (height: width) of the cemented rockfill dam and cemented rockfill dam shall be 1:0.5 to 1:1; the middle and downstream areas shall be low stress areas of the dam body, using various types of roller compacted earth-rock dams, and the downstream slope ratios (height: width) shall be 1:1 to 1:2.

[0018] S4. Based on the estimated types and quantities of excavated materials, design the combined dam body according to the principles of step S3, and analyze the stability and stress of the dam body. For various concrete, cemented rockfill, and cemented gravel dam bodies adjacent to the upstream side, analyze the stability of each foundation surface and each layer as a whole and the stress of the main parts according to the rigid body limit equilibrium method and material mechanics method or finite element method. Parameters are calculated separately for different materials, and the rockfill or earth-rock body in the middle and lower parts is considered as the downstream side load; for the rockfill and earth-rock dam body adjacent to the middle and lower parts, stability and stress analysis are carried out according to the design method of earth-rock dam.

[0019] Embodiment 2: (1) Through the analysis of engineering geology and excavated materials, it is preliminarily estimated that hard rock accounts for about 30% (of which particles account for about 40%), soft rock accounts for 40%, and soil-rock mixture accounts for 30%.

[0020] (2) Based on the above raw material estimates, the usage of various excavated materials in the project is analyzed: about 12% of the rockfill can be used for rockfill concrete, about 18% can be used for concrete aggregate, 40% can be used for cemented rockfill, and about 30% can be used for compacted soil and rock.

[0021] (4) Analysis of the dam volume corresponding to each raw material, with the proportion as the relative quantity analysis (volume parts): 24 parts of rockfill concrete, 15 parts of concrete, 60 parts of cemented rockfill, and 40 parts of rolled earth-rock. Among them, 4 parts of concrete are used for the anti-seepage area, and the remaining 11 parts are used for various concrete structures; the total dam volume is 24 parts + 4 parts + 60 parts + 40 parts = 130 parts, of which the rockfill concrete dam volume accounts for 18.5%, the anti-seepage area accounts for 3.1%, the cemented rockfill dam volume accounts for 46.2%, and the rolled earth-rock dam volume accounts for 32.2%.

[0022] (5) According to the above ratio, the cross section is designed as follows: Figure 1 shown.

[0023] The comparison between this embodiment and the main concrete types of the dam is shown in the following table:

[0024] It can be seen that the dam body formed by the comprehensive utilization method of excavated materials from a pumped storage power station in this embodiment has a construction period and cost less than that of a dam body formed by a traditional method.

[0025] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A method for comprehensive utilization of excavated materials of a pumped storage power station based on cementation technology, characterized in that: It includes the following steps: S1. Preliminarily determine the applicable dam type based on the location and geological conditions of the upper and lower reservoirs of the pumped storage power station; S2. Classify and estimate the quantity of various excavated materials in combination with the project; S3. Structural design: The dam design is carried out based on various excavated materials according to the following principles: S3.

1. When the foundation conditions allow the construction of a rigid dam and the amount of hard rock obtained through excavation can meet the engineering requirements of various types of concrete dams, rockfill concrete dams, roller-compacted concrete dams or normal concrete dams shall be given priority; S3.

2. When the amount of hard rock in the excavated material is insufficient to construct a concrete dam, a composite dam design shall be carried out according to the type and amount of excavated material; S4. Based on the estimated type and quantity of excavated materials, the combined dam body is designed according to the principles of step S3, and the stability and stress of the dam body are analyzed.

2. The method for comprehensive utilization of excavated materials of a pumped storage power station based on cementation technology according to claim 1, characterized in that: In the step S1, the applicable dam types are preliminarily determined to include: roller compacted earth-rock dam, face rockfill dam, cemented gravel dam, concrete dam, roller compacted concrete dam, rockfill concrete dam, and cemented rockfill dam.

3. The method for comprehensive utilization of excavated materials of a pumped storage power station based on cementation technology according to claim 1, characterized in that: In step S2, various excavated materials are utilized as follows: (1) Hard rock, used for all dam types, with priority given to concrete-related dam types; (2) Soft rock, used for rolled earth-rock dams, face rockfill dams, and cemented rockfill dams; (3) Sand and gravel, used for cementing sand and gravel dams; (4) Earth and rock materials: used for compacting earth-rock dams and covering green areas.

4. The method for comprehensive utilization of excavated materials of a pumped storage power station based on cementation technology according to claim 1, characterized in that: In step S3.1, the excavated materials are utilized as follows: large stones with a particle size of 150 mm or more are used as rockfill in the form of rockfill concrete dam; particles below 150 mm are used to process coarse and fine aggregates and stone powder required for concrete, which are used for self-compacting concrete, roller-compacted concrete or normal concrete; the remaining soil and stone materials are used as soil covering behind the dam for ecological greening.

5. The method for comprehensive utilization of excavated materials of a pumped storage power station based on cementation technology according to claim 1, characterized in that: In step S3.2, a concrete anti-seepage area is set on the upstream surface, using normal concrete or self-compacting concrete; the upstream area is set as the core area of ​​the dam body, using one or more combinations of rockfill concrete, roller-compacted concrete, normal concrete, cemented rockfill, and cemented gravel.

6. The method for comprehensive utilization of excavated materials of a pumped storage power station based on cementation technology according to claim 1, characterized in that: In step S3.2, the upstream and downstream slope ratios (height: width) of the concrete dam are vertical to 1:0.80, and the downstream slope ratios (height: width) of the cemented rockfill dam and cemented rockfill dam are 1:0.5 to 1:1; the middle and downstream areas are low stress areas of the dam body, and various types of rolled earth-rock dams are used, and the downstream slope ratios (height: width) are 1:1 to 1:

2.

7. The method for comprehensive utilization of excavated materials of a pumped storage power station based on cementation technology according to claim 1, characterized in that: In step S4, for various concrete, cemented rockfill, and cemented gravel dam bodies adjacent to the upstream side, the stability of each foundation surface and each layer and the stress conditions of the main parts are analyzed as a whole according to the rigid body limit equilibrium method and material mechanics method or the finite element method. The calculation parameters are taken separately for different materials, and the rockfill or earth-rock body in the middle and lower parts are considered as the downstream side load; the stability and stress analysis of the rockfill and earth-rock dam body adjacent to the middle and lower parts is carried out according to the design method of earth-rock dam.

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