| 超高沥青混凝土心墙高应力水平的降低措施研究 |
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| 引用本文： | 高俊,党发宁,马宗源.超高沥青混凝土心墙高应力水平的降低措施研究[J].岩土力学,2020,41(5):1730-1739. |
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| 作者姓名： | 高俊 党发宁 马宗源 |
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| 作者单位： | 西安理工大学 西北旱区生态水利国家重点实验室，陕西 西安 710048 |
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| 基金项目： | 国家自然科学基金项目（No.51979225，No.51679199）；水利部公益性行业科研专项基金资助项目（No.201501034-04）；陕西省科技统筹创新工程重点实验室项目（No.2014SZS15-Z01） |
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| 摘 要： | 随着沥青混凝土心墙堆石坝的快速发展，超高沥青混凝土心墙堆石坝建设迎来了前所未有的机遇，但随着坝高的增加，心墙的安全挑战也变得异常突出。基于应力水平的定义，提出降低超高沥青混凝土心墙高应力水平的措施，依托心墙应力水平的敏感性研究，推算了独立满足和综合满足心墙屈服剪切破坏控制标准的心墙材料强度参数（最敏感材料参数）取值范围。研究表明，心墙应力水平随坝高和河谷岸坡坡比的增加而显著增大；心墙破坏比 、黏聚力 和内摩擦角 属于高敏感性参数；增大心墙破坏比 、黏聚力 和内摩擦角 能够显著地降低心墙应力水平；推荐适宜建设超高沥青混凝土心墙堆石坝的心墙破坏比 、黏聚力 和内摩擦角 取值范围： 0.8、 0.4 MPa和 31.5°（坝高 200 m），且随坝高的增长梯度按5%/25 m、15%/25 m和5%/25 m进行调整。
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| 关 键 词： | 超高沥青混凝土心墙堆石坝 应力水平 敏感性研究 降低措施 |
| 收稿时间： | 2019-07-16 |
| 修稿时间： | 2019-10-08 |
Reduction measure research for reduction of high stress level
of ultra-high asphalt concrete core |
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| GAO Jun,DANG Fa-ning,MA Zong-yuan.Reduction measure research for reduction of high stress level
of ultra-high asphalt concrete core[J].Rock and Soil Mechanics,2020,41(5):1730-1739. |
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| Authors: | GAO Jun DANG Fa-ning MA Zong-yuan |
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| Institution: | State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an, Shaanxi 710048, China |
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| Abstract: | With the rapid development of asphalt concrete core rockfill dams, an unprecedented opportunity is coming for the construction of ultra-high asphalt concrete core rockfill dams. However, with the increase of dam height, the security challenges of core become very prominent. Based on the definition of stress level, an improved measure that reduces the high stress level of ultra-high asphalt concrete core is proposed. Depending on the sensitivity research of tress level of core, the value ranges of strength parameters (most sensitive material parameters) of core that can independently and comprehensively meet the yield shear failure control standard are calculated, respectively. The results show that the stress level of core increases sharply with increase of dam height and valley slope ratio. The failure ratio , cohesion c, and internal friction angle of core are the highest sensitivity parameters and the stress level of core can be reduced effectively by the increase of failure ratio , cohesion c, and internal friction angle of core. The recommended value ranges of failure ratio , cohesion c, and internal friction angle of core for the suitable construction of ultra-high asphalt concrete core rockfill dams are: 0.8, 0.4 MPa, and 31.5° (dam height 200 m), with the growth gradient adjusted by 5%/25 m, 15%/25 m, and 5%/25 m. |
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| Keywords: | ultra-high asphalt concrete core rockfill dam stress level sensitivity investigation reduction measure |
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