Modern dam type determination and analysis method for water conservancy and hydropower engineering

Abstract

The invention discloses a water conservancy and hydropower engineering modern dam type determination and analysis method, and belongs to the technical field of water conservancy and hydropower engineering. The method comprises the following steps: step 1, determining a characteristic water level according to flood regulation calculation; 2, the maximum dam height H is determined; 3, the maximum drainage flow Q is determined; 4, calculating the leakage height ratio R; and fifthly, the dam type is selected according to the leakage height ratio R. The dam type is selected according to the drainage height ratio, the absorption capacity of various dam types on the drainage flow can be quantitatively analyzed, the dam type selection range is narrowed, the dam type adaptive to the drainage scale and the corresponding junction building are scientifically and reasonably selected, the dam type is determined by considering the flood discharge factor, the comparison and selection time and energy can be saved, and the dam type determination efficiency is improved. In the dam type determination process, multiple professions do not need to be matched to carry out a large amount of calculation and analysis work, the dam type determination process is simplified, and the requirement for the professional level of personnel is lowered.

Description

Technical Field

[0001] The invention relates to a method for determining and analyzing modern dam types of water conservancy and hydropower engineering, and belongs to the technical field of water conservancy and hydropower engineering. Background Art

[0002] The dam types commonly used in water conservancy and hydropower projects are mainly divided into two categories: concrete dams and earth-rock dams, including concrete arch dams, concrete gravity dams, homogeneous earth dams, face rockfill dams, core wall rockfill dams, etc. There are many types of dam types to choose from, so specific designs are required based on the actual conditions of the project.

[0003] The traditional dam type selection method mainly adopts the comparison method, that is, the optional dam type is initially formulated in combination with the topography, stratum lithology, geological structure, hydrological conditions, etc. of the selected dam site; then the engineering suitability of various dam types is analyzed by comprehensively considering the technical, economic, environmental, and operational aspects to determine the recommended dam type. It can be seen that the comparison method to determine the dam type requires a large amount of calculation and analysis work to be carried out by multiple disciplines, which has the disadvantages of being cumbersome and complicated, requiring high professional level of personnel, and being time-consuming and labor-intensive. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a modern dam type determination and analysis method for water conservancy and hydropower projects, which can greatly simplify the dam type determination process, significantly improve work efficiency, and provide a new idea for the rational selection of dam types.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for determining and analyzing the modern dam type of a water conservancy and hydropower project comprises the following steps:

[0007] Step 1: Determine the characteristic water level according to flood control calculation;

[0008] Step 2: Determine the maximum dam height H;

[0009] Step 3: Determine the maximum discharge flow Q;

[0010] Step 4: Calculate the discharge height ratio R;

[0011] Step 5: Select the dam type according to the discharge height ratio R.

[0012] The characteristic water level in step 1 includes the normal water storage level and the verified flood level.

[0013] The calculation formula of the discharge height ratio R in step 4 is:

[0014] R = Q / H.

[0015] In the step 5, when the discharge height ratio R>180, the dam type is selected as a gravity dam.

[0016] In the step 5, when 100<discharge height ratio R<180, the dam type is selected as an arch dam.

[0017] When the discharge height ratio R is between 100 and 122, an earth-rock dam may also be selected, but one of the following conditions must be met: (1) the geological conditions are not conducive to the construction of a concrete dam; (2) the dam site has natural topographic and geological conditions for the arrangement of bank discharge structures; (3) the dam site is located in a remote mountainous area with poor external transportation conditions; (4) the source of cementitious materials is not guaranteed.

[0018] In the step 5, when the discharge height ratio R<100, the dam type is selected as an earth-rock dam.

[0019] The earth-rock dam includes a core rockfill dam and a face rockfill dam.

[0020] After selecting the dam type according to the discharge height ratio R in step 5, the dam type is reviewed based on a comprehensive technical and economic comparison and demonstration based on the dam site topography and geology, hub layout, dam type adaptability, impact of adverse geological bodies in the reservoir area, flood discharge and energy dissipation, anti-scouring and bank protection, project volume, construction diversion, construction conditions, construction period, building materials, project investment and operating conditions.

[0021] The beneficial effects of the present invention are: by selecting the dam type according to the discharge height ratio, the capacity of various dam types to absorb the discharge flow can be quantitatively analyzed, the range of dam type selection can be narrowed, and the dam type and corresponding key hub buildings suitable for the discharge scale can be scientifically and reasonably selected. The dam type can save time and energy for comparison and selection by considering the flood discharge factor, and the efficiency of dam type determination can be improved. In the process of dam type determination, it is not necessary for multiple professionals to cooperate with each other to carry out a large amount of calculation and analysis work, which simplifies the dam type determination process and reduces the requirements for the professional level of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an analytical statistical chart of the dam type, dam height and discharge height ratio of the completed water conservancy and hydropower projects. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0024] Embodiment 1:

[0025] like Figure 1 As shown, a method for determining and analyzing the modern dam type of a water conservancy and hydropower project described in the present invention comprises the following steps:

[0026] Step 1: Determine the characteristic water level according to flood control calculation;

[0027] Step 2: Determine the maximum dam height H;

[0028] Step 3: Determine the maximum discharge flow Q;

[0029] Step 4: Calculate the discharge height ratio R;

[0030] Step 5: Select the dam type according to the discharge height ratio R.

[0031] The characteristic water level in step 1 includes the normal water storage level and the verified flood level.

[0032] The calculation formula of the discharge height ratio R in step 4 is:

[0033] R = Q / H.

[0034] When in use, Q in the formula can be the maximum discharge flow or the engineering design discharge flow (m 3 / s), H is the maximum dam height (m).

[0035] In the step 5, when the discharge height ratio R>180, the dam type is selected as a gravity dam.

[0036] In the step 5, when 100<discharge height ratio R<180, the dam type is selected as an arch dam.

[0037] When the discharge height ratio R is between 100 and 122, the dam type can also be selected as an earth-rock dam, but one of the following conditions must be met: (1) The geological conditions are not conducive to the construction of a concrete dam, such as a thick foundation with a thick overburden layer (Xiaolangdi Project), weak rock properties of the dam foundation or low bearing capacity of the rock mass (Tianshengqiao Level 1 Project), uneven hardness of the dam foundation rock mass (Nuozadu Project), and the existence of unfavorable structural surfaces that restrict the anti-sliding stability of the dam foundation or dam shoulder; (2) The dam site has natural topographic and geological conditions for arranging bank flood discharge structures, such as low and gentle slopes on the bank, natural passes, and thin ridges formed by gully cutting; (3) The dam site is located in a remote mountainous area with poor external transportation conditions, such as long external highway transportation distances and winter transportation restricted by high-altitude ice and snow mountain sections, which makes it impossible to ensure the continuous transportation of large quantities of external materials such as cement and admixtures, resulting in no guarantee of construction intensity and construction period; (4) The source of cementitious materials is not guaranteed, that is, the source of cementitious materials such as cement or admixtures (with an admixture amount greater than 5%) is not implemented or guaranteed.

[0038] In the step 5, when the discharge height ratio R<100, the dam type is selected as an earth-rock dam.

[0039] The earth-rock dam includes a core rockfill dam and a face rockfill dam.

[0040] Table 1 Selection of dam type according to discharge height ratio R

[0041]

[0042] After selecting the dam type according to the discharge height ratio R in step 5, the dam type is reviewed based on a comprehensive technical and economic comparison and demonstration based on the dam site topography and geology, hub layout, dam type adaptability, impact of adverse geological bodies in the reservoir area, flood discharge and energy dissipation, anti-scouring and bank protection, project volume, construction diversion, construction conditions, construction period, building materials, project investment and operating conditions.

[0043] Embodiment 2:

[0044] Take the determination of the hub dam type of the Shatuo Hydropower Station on the Wujiang River Basin in Yanhe Tujia Autonomous County in the northeast of Guizhou Province as an example.

[0045] The Shatuo Hydropower Station initially determined the normal water storage level to be 365.00m, the verified flood level to be 369.65m, and the maximum dam height to be 101m. The maximum discharge flow was determined to be 32019m 3 / s.

[0046] Calculate the discharge height ratio, R = Q / H = 32019 / 101 = 317 (m 3 / sm).

[0047] Check Table 1 and select gravity dam as the dam type. Finally, the Shatuo Hydropower Station Hub is built with a concrete gravity dam.

[0048] Embodiment three:

[0049] Take the determination of the hub dam type of the Baihetan Hydropower Station on the mainstream of the lower reaches of the Jinsha River in Ningnan County, Sichuan Province and Qiaojia County, Yunnan Province as an example.

[0050] The normal water storage level of the Baihetan Hydropower Station hub was initially determined to be 825.00m, the verified flood level was 832.34m, and the maximum dam height was determined to be 289m.

[0051] The maximum discharge flow is determined to be 42356m 3 / s.

[0052] Calculate the discharge height ratio, R = Q / H = 42356 / 289 = 146.56 (m 3 / sm).

[0053] Check Table 1 and select arch dam as the dam type. Finally, the Baihetan Hydropower Station Hub is built with a concrete double-curvature dam.

[0054] Embodiment 4:

[0055] Take the determination of the hub dam type of the Shuangjiangkou Hydropower Station on the Dadu River in Ma'erkang County and Jinchuan County of Aba Prefecture, Sichuan Province as an example.

[0056] The normal water storage level of Shuangjiangkou Hydropower Station is initially determined to be 2500.00m, the verified flood level is 2504.42m, and the maximum dam height is determined to be 314m. The maximum discharge flow is determined to be 8102m3 / s.

[0057] Calculate the discharge height ratio, R = Q / H = 8102 / 314 = 25.8 (m 3 / sm).

[0058] The dam type is selected as earth-rock dam by looking up Table 1. Finally, the Shuangjiangkou Hydropower Station is built as a core rockfill dam.

Claims

1. A method for determining and analyzing modern dam types for water conservancy and hydropower projects, characterized by: The following steps are involved: Step 1: Determine the characteristic water level according to flood control calculation; Step 2: Determine the maximum dam height H; Step 3: Determine the maximum discharge flow Q; Step 4: Calculate the discharge height ratio R; Step 5: Select the dam type according to the discharge height ratio R.

2. The method for determining and analyzing the modern dam type of water conservancy and hydropower engineering according to claim 1 is characterized by: The characteristic water level in step 1 includes the normal water storage level and the verified flood level.

3. The method for determining and analyzing the modern dam type of water conservancy and hydropower engineering according to claim 1 is characterized by: The calculation formula of the discharge height ratio R in step 4 is: R = Q / H.

4. The method for determining and analyzing the modern dam type of water conservancy and hydropower engineering according to claim 1 is characterized by: In the step 5, when the discharge height ratio R>180, the dam type is selected as a gravity dam.

5. The method for determining and analyzing the modern dam type of water conservancy and hydropower engineering according to claim 1 is characterized by: In the step 5, when 100<discharge height ratio R<180, the dam type is selected as an arch dam.

6. The method for determining and analyzing the modern dam type of water conservancy and hydropower engineering according to claim 5 is characterized by: When the discharge height ratio R is between 100 and 122, an earth-rock dam may also be selected, but one of the following conditions must be met: (1) the geological conditions are not conducive to the construction of a concrete dam; (2) the dam site has natural topographic and geological conditions for the arrangement of bank discharge structures; (3) the dam site is located in a remote mountainous area with poor external transportation conditions; (4) the source of cementitious materials is not guaranteed.

7. The method for determining and analyzing the modern dam type of water conservancy and hydropower engineering according to claim 1 is characterized by: In the step 5, when the discharge height ratio R<100, the dam type is selected as an earth-rock dam.

8. The method for determining and analyzing the modern dam type of water conservancy and hydropower engineering according to claim 7 is characterized by: The earth-rock dam includes a core rockfill dam and a face rockfill dam.

9. The method for determining and analyzing the modern dam type of water conservancy and hydropower engineering according to claim 1, characterized in that: After selecting the dam type according to the discharge height ratio R in step 5, the dam type is reviewed based on a comprehensive technical and economic comparison and demonstration based on the dam site topography and geology, hub layout, dam type adaptability, impact of adverse geological bodies in the reservoir area, flood discharge and energy dissipation, anti-scouring and bank protection, project volume, construction diversion, construction conditions, construction period, building materials, project investment and operating conditions.

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