本文選題：溫度應力 + 混凝土澆筑溫度��； 參考：《水利水電技術》2017年09期

【摘要】：針對壩身開孔后削弱了混凝土壩結(jié)構的整體性、孔口周圍易產(chǎn)生應力集中并可能導致產(chǎn)生溫度裂縫的問題,采用三維有限單元法對底孔壩段施工全過程進行溫度應力場仿真研究,計算考慮了通水冷卻、混凝土的水化熱溫升以及彈性模量等對底孔壩段溫度和應力的影響,并對比分析了不同方案下壩體溫度應力。結(jié)果表明:方案4(約束區(qū)Tp=18℃,非約束區(qū)Tp=22℃,通水冷卻)在采取通水冷卻和控制混凝土澆筑溫度措施后,高程1 624.5~1 631.5 m范圍內(nèi)墊層常態(tài)混凝土最高溫度為33.8℃,最大溫度應力為1.50 MPa;高程1 626.5~1 646.5 m范圍內(nèi)碾壓混凝土最高溫度為26.8℃,最大溫度應力為1.32 MPa;高程1 646.5~1 692.0 m范圍內(nèi)閘室以上常態(tài)混凝土最高溫度為36.5℃,最大溫度應力為1.45 MPa,從而壩段各區(qū)域的最高溫度均小于允許最高溫度,最大應力小于該工程的允許拉應力。研究成果為混凝土壩底孔壩段施工溫度控制提供借鑒。
[Abstract]:The integrity of the concrete dam structure is weakened after the opening of the dam body, and the stress concentration around the orifice is easy to produce and may lead to temperature cracks. The 3-D finite element method is used to simulate the temperature stress field in the whole construction process of the bottom hole dam segment. The effects of water cooling, hydration heat temperature rise of concrete and elastic modulus on the temperature and stress of the bottom hole dam section are calculated. The temperature stress of dam body under different schemes is compared and analyzed. The results show that the maximum temperature of normal concrete in the inner cushion is 33. 8 鈩，

本文編號：1838571