外文翻譯----對水電站混凝土壩工程建設(shè)的研究(編輯修改稿)
2025-06-26 11:34 本頁面
【文章內(nèi)容簡介】 terial and the design and construction of cementedrockfill dam have been studied in this paper. II. CHARACTERISTICS OF CEMENTEDROCKFILL Cementedrockfill is a material made by adding little cement to rocklike material such as rockfill or gravel, mixing it simply and rolling with vibration rollers, which can 7 be considered as a lean RCC. Figure 1 shows the typical stressstrain curve of Cementedrockfill [8]. From the figure, Cementedrockfill shows the elastoplasticity behavior, only the elastic range of cementedrockfill is considered in designing. Figure 1. Typical stressstrain curve of cementedrockfill material The cementedrockfill have following characterizes: (1) Cementedrockfill is a kind of material which is rolled and pacted by adding little cement in rockfill (artificial mining) or gravel (nature existing). Its mechanical property is higher than rockfill but lower than concrete. (2) The dam material with some cement became cementedrockfill after rolled but not granular material. Therefore, the dam has good antiscouring ability and great shear and pressive resistance ability. Good antiscouring ability is an outstanding advantage of this dam type, which can lower construction diversion standard as allowing flood across the dam during the construction period and increase safety degree as can antiseepage and allowing flood overtopping in use period. (3) Cementedrockfill has greater deformation modulus. Reference [6] referred that the deformation modulus of cementedrockfill can reach 10GPa, which is about 10 or 100 times of rockfill. Higher deformation modulus can decrease dam deformation sharply, that’s good for upstream impervious body. (4) Cementedrockfill dam mainly to sustain impervious body and keep dam stability, and also transmit the load to the base. Therefore, there only require the dam materials have certain strength, deformation modulus and antiscouring ability, but no antiseepage requirement. So that can decrease cement mixing amount (pared to concrete) and relax aggregate requirement. Meantime, cracks control, interface treatment and local discretization and some other requirement can be relaxed. (5) Londe [6] summarized foreign experiences and put forward that: while mix cement 50~60 kg/m179。 in rockfill, its strength can reach to 5 MPa (90d age), that can 8 satisfy 100 m high dam strength requirement. Lower cement mixing amount means lower hydration heat and smaller temperature rise. Therefore, the temperature stress is much smaller than RCCD. Besides, the dam has no antiseepage requirement。 even micro cracks have little influence to the structure function. So there need not to set expansion joint and can construct as normal rockfill dam. (6) Lower cement usage can decrease the total cost. (7) The loose aggregate (rockfill) requirements can simplify the preparation section and reduce the cost, produce less waste slag that can protect vegetation and shrink the scale of quarry plant and reduce transport cost. (8) Cementedrockfill dam construction method maintains normal rockfill dam construction features, simple and fast. III. EXPERIMENTAL RESEARCH A. Aggregate characteristics The technical characteristics of cementedrockfill are that strength mixing cement with the rockfill. Cement plays a ma
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