| 特高拱坝施工期谷幅变形演化规律 |
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| 引用本文： | 王文娟,纪丁愈,李云祯.特高拱坝施工期谷幅变形演化规律[J].水利水运工程学报,2022,0(3):82-89. |
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| 作者姓名： | 王文娟 纪丁愈 李云祯 |
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| 作者单位： | 1.绵阳师范学院 资源环境工程学院，四川 绵阳 621000 |
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| 基金项目： | 国家自然科学基金资助项目（51879172）；四川省水利厅专项项目（SKY2019-05） |
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| 摘 要： | 跟踪分析高坝施工期谷幅变形，对确保高边坡稳定与大坝安全具有重要意义。基于某特高拱坝工程环境与地质结构，跟踪分析坝区两岸岩体变形监测数据，采用有限差分法，模拟分析谷幅变形演化规律，探讨了坝区施工期的谷幅变形演化规律与驱动因素。研究表明，坝后水垫塘谷幅变形规律表现为不同高程谷幅变化规律相似，收缩变形量与高程具有很好的正相关性，高程高的部位变形量相对较大；两岸均朝向河谷变形，与高程呈现正相关性，左岸变形速率略大于右岸；变形数值仿真结果与现场实测变形量值较接近。研究结果可为大坝后期正常蓄水提供参考依据。
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| 关 键 词： | 特高拱坝 谷幅变形 变形监测 成因机理 |
| 收稿时间： | 2021-04-26 |
Evolution law of valley deformation during construction of extra-high arch dam |
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| Affiliation: | 1.College of Resources and Environmental Engineering, Mianyang Teachers’ College, Mianyang 621000, China2.State Key Laboratory of Hydraulics and Mountain River Development and Protection, Sichuan University, Chengdu 610065, China3.Sichuan Polytechnic College, Chongzhou 611231, China4.Sichuan Institute of Ecological and Environmental Science, Chengdu 610041, China |
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| Abstract: | Tracking and analyzing the valley deformation of a high dam during construction is of great significance for high slope stability and dam safety. In this paper, the finite difference method is used to simulate the evolution of valley deformation. Based on the engineering environment and geological structure of an extra-high arch dam, we tracked and analysed the monitoring data of rock mass deformation on both sides of the dam area, and discussed the driving factors and evolution laws of valley deformation during construction in the dam area. The law of valley deformation of the plunge pool behind the dam shows that the variation law of valley deformation at different elevations is similar. The shrinkage deformation has a good positive correlation with the elevation, and the deformation of the part with high elevation is relatively large. Both banks deform towards the river valley, showing a positive correlation with elevation. The deformation speed of the left bank is slightly faster than that of the right bank. The numerical simulation results of deformation are close to the field measured results. The research results can provide a reference for normal water storage in the later stage of the dam. |
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