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CN-117604988-B - Roller compacted concrete gravity dam in strong earthquake area

CN117604988BCN 117604988 BCN117604988 BCN 117604988BCN-117604988-B

Abstract

The invention relates to the technical field of hydraulic and hydroelectric engineering, in particular to a roller compacted concrete gravity dam in a strong shock area, which comprises a dam body and a consolidation grouting base layer, wherein an upstream dam slope extending from a dam bottom to a dam top in a straight line is arranged on the upstream side of the dam body, the slope ratio of the upstream dam slope is 1:n 1 , a downstream dam slope is arranged on the downstream side of the dam body, the downstream dam slope comprises a vertical slope section and a slope section, the vertical slope section extends downwards and vertically from the dam top, the slope section extends from the lower tail end of the vertical slope section to the dam bottom in a straight line, the slope ratio of the slope section is 1:n 2 , the dam bottom of the dam body is connected to the top surface of the consolidation grouting base layer, and the consolidation grouting base layer is flatly fixed on a water bottom bedrock, wherein n 1 ≥0.40,n 2 is more than or equal to 0.90. The roller compacted concrete gravity dam in the strong earthquake area can improve the stability of the gravity dam by slowing down the upstream dam slope and the inclined straight slope section, thereby being applicable to areas with high earthquake intensity.

Inventors

  • ZHENG LINNA
  • GAO DONGHONG
  • ZHANG JINGJING
  • TIAN JINBO
  • YANG JUNQIAO

Assignees

  • 上海勘测设计研究院有限公司

Dates

Publication Date
20260512
Application Date
20231215

Claims (10)

  1. 1. The utility model provides a strong jolt area roller compacted concrete gravity dam, its characterized in that includes dam body (1) and concretion grout basic unit (2), the upstream side of dam body (1) is equipped with by dam bottom to dam crest slope straight line extension's upstream dam slope (11), the slope ratio of upstream dam slope (11) is 1:n 1 , the downstream side of dam body (1) is equipped with downstream dam slope (12), downstream dam slope (12) include vertical slope section (121) and slope section (122), vertical slope section (121) are by the dam crest downward vertical extension, slope section (122) are by the slope straight line extension of dam bottom to the end below vertical slope section (121), the slope ratio of slope section (122) is 1:n 2 , the dam bottom of dam body (1) is connected on the top surface of concretion grout basic unit (2), concretion basic unit (2) are fixed on the water bottom 1 ≥0.40,n 2 , wherein n is more than or equal to 0.90.
  2. 2. The heavy-duty dam for roller compacted concrete in a strong earthquake area according to claim 1, wherein a wave wall (13) is arranged on the upstream side of the dam top of the dam body (1), a guardrail (14) is arranged on the downstream side of the dam top, and the wave wall (13) and the guardrail (14) both extend along the length direction of the dam body (1).
  3. 3. The heavy-duty roller concrete dam for a strong earthquake area according to claim 2, wherein the blast wall (13) is a reinforced concrete structure.
  4. 4. The heavy-duty roller concrete dam in the high-vibration area according to claim 1, characterized in that the upstream dam slope (11) of the dam body (1) is coated with an anti-seepage coating on the slope.
  5. 5. The heavy roller concrete dam in the high vibration area according to claim 1, wherein the junction of the vertical slope section (121) and the inclined slope section (122) adopts arc transition.
  6. 6. The heavy dam of the roller compacted concrete in the strong earthquake area according to claim 1, characterized in that the upstream side of the dam body (1) is provided with an impermeable curtain (15) at the position of the dam bottom, the impermeable curtain (15) penetrates out of the consolidation grouting base layer (2) into the underwater bedrock, and the impermeable curtain (15) extends along the vertical water flow direction until being attached to the two sides.
  7. 7. The roller compacted concrete gravity dam in the strong earthquake area according to claim 6, wherein the dam body (1) is provided with a basic grouting and drainage gallery (16) extending along the length direction at the upstream side, the dam top surface of the dam body (1) is provided with a dam body drainage pipe hole (17) communicated with the outside, the consolidation grouting base layer (2) is provided with a dam foundation drainage pipe hole (21) communicated with the underwater bedrock, and the basic grouting and drainage gallery (16) is respectively communicated with the dam body drainage pipe hole (17) and the dam foundation drainage pipe hole (21).
  8. 8. The heavy-duty roller concrete dam for a strong earthquake area according to claim 7, wherein the dam foundation drain hole (21) extends obliquely to the downstream side with a space from the impermeable curtain (15), and the depth of the dam foundation drain hole (21) into the underwater bedrock is half the depth of penetration of the impermeable curtain (15) into the underwater bedrock.
  9. 9. The heavy-duty roller concrete dam in a high-vibration area according to claim 7, wherein said foundation grouting and drainage gallery (16) extends in a longitudinal direction in a cross-sectional configuration of a gate hole.
  10. 10. The roller compacted concrete gravity dam in a strong earthquake area according to claim 1, wherein a plurality of anchor rods (22) are fixed on the concreting grouting base layer (2) at intervals in a concreting grouting mode, and each anchor rod (22) is fixedly connected in the underwater bedrock in a penetrating way.

Description

Roller compacted concrete gravity dam in strong earthquake area Technical Field The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a roller compacted concrete gravity dam in a strong earthquake area. Background Because the roller compacted concrete gravity dam body type needs to meet the requirements of anti-slip stability and stress along a building base surface and a roller compacted layer, and meanwhile, the roller compacted concrete gravity dam body type needs to be convenient for the mechanized rapid construction of a roller compacted concrete large warehouse surface, so that the body type design is easy. When the conventional gravity dam is designed, the upstream surface is preferably a vertical surface, namely the slope ratio of the upstream dam slope is 1:0, and when the upstream surface is a folded surface with folded slope points, namely the slope ratio of the upstream dam slope is more than 1:0, the downstream dam slope can be optimized according to the requirements of stability and stress. Generally, the upstream dam slope is preferably a slope ratio of 1:0 to 1:0.25, and the downstream dam slope is preferably a slope ratio of 1:0.6 to 1:0.8. For areas with high earthquake intensity (VIII degrees and above) and high earthquake peak acceleration, the body type of the conventional roller compacted concrete gravity dam cannot meet the requirements of stability and stress along a building base surface and a roller compacted layer, and is easy to break through at stress concentration positions such as a folding slope point. Therefore, the roller compacted concrete gravity dam body type design is needed, and the earthquake-proof fortification requirement of the strong earthquake area is met. Disclosure of Invention In order to solve the technical problems, the invention provides a roller compacted concrete gravity dam suitable for a strong earthquake area in a high earthquake intensity area. The invention adopts the following technical scheme: The invention provides a roller compacted concrete gravity dam in a strong shock area, which comprises a dam body and a consolidation grouting base layer, wherein an upstream dam slope extending from a dam bottom to a dam top in a straight line is arranged on the upstream side of the dam body, the slope ratio of the upstream dam slope is 1:n 1, a downstream dam slope is arranged on the downstream side of the dam body, the downstream dam slope comprises a vertical slope section and a diagonal slope section, the vertical slope section extends downwards and vertically from the dam top, the diagonal slope section extends from the lower tail end of the vertical slope section to the dam bottom in a straight line, the slope ratio of the diagonal slope section is 1:n 2, the dam bottom of the dam body is connected to the top surface of the consolidation grouting base layer, and the consolidation grouting base layer is fixed on water foundation rock in a tiled mode, wherein n 1≥0.40,n2 is more than or equal to 0.90. Preferably, the dam crest of the dam body is provided with a wave wall on the upstream side and a guardrail on the downstream side, and the wave wall and the guardrail extend along the length direction of the dam body. Preferably, the wave wall is a reinforced concrete structure. Preferably, the upstream dam slope of the dam is coated with an impermeable coating on the slope. Preferably, the junction of the vertical slope section and the inclined slope section adopts arc transition. Preferably, the upstream side of the dam body is provided with an impermeable curtain at the position of the dam bottom, the impermeable curtain penetrates out of the consolidation grouting base layer and enters the underwater bedrock, and the impermeable curtain extends along the direction perpendicular to water flow until being attached to the two banks. Preferably, the upstream side of the dam body is provided with a foundation grouting and drainage gallery extending along the length direction, the top surface of the dam body is provided with a dam body drainage pipe hole communicated with the outside, the consolidation grouting base layer is provided with a dam foundation drainage pipe hole communicated with the foundation rock at the water bottom, and the foundation grouting and drainage gallery is respectively communicated with the dam body drainage pipe hole and the dam foundation drainage pipe hole. Preferably, the dam foundation drain hole and the impermeable curtain extend obliquely to the downstream side at intervals, and the depth of the dam foundation drain hole into the water bed bedrock is half the depth of the impermeable curtain penetrating into the water bed bedrock. Preferably, the foundation grout and drainage gallery extends lengthwise in a cross-sectional configuration of the city gate opening. Preferably, a plurality of anchor rods are fixed on the concretion grouting base layer at intervals in a con