Pan Litan, Fan Zhidong, Wang Daquan, Zhou Xiongxiong
Huadian Electric Power Research Institute Company Limited, Hangzhou, Zhejiang 310000, China.
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100, China.
ScientificWorldJournal. 2023 Oct 12;2023:5593636. doi: 10.1155/2023/5593636. eCollection 2023.
The wetting deformation of the upstream dam shell material during the impoundment of the core wall rockfill dam seriously affects the safety of the dam. Based on the proposed - wetting model, this paper proposes its corresponding two methods to simulate the collapse settlement of the rockfill dam: the initial strain method and the initial stress method. By simulating the collapse settlement of the Guanyinyan core wall rockfill dam, it is found that the simulated result using the initial stress method is in good agreement with the field monitoring data, while the displacement simulated using the initial strain method is larger. The distribution of displacement contours simulated using the initial strain method is obviously inconsistent in the area where the wetting deformation occurs, and the simulation results of the initial stress method are more reasonable. With the rise in the water level, the wetting deformation of the upstream dam shell material causes the tensile stress zone at the top of the dam. Therefore, the wetting deformation is the direct cause of the crack at the top of the dam, and the initial stress method should be preferred in the simulation of the wetting deformation of rockfill materials.
心墙堆石坝蓄水过程中上游坝壳料的湿化变形严重影响大坝安全。基于所提出的湿化模型，本文提出了相应的两种模拟堆石坝压缩沉降的方法：初始应变法和初始应力法。通过对观音岩心墙堆石坝压缩沉降的模拟，发现采用初始应力法的模拟结果与现场监测数据吻合较好，而采用初始应变法模拟的位移偏大。初始应变法模拟的位移等值线分布在发生湿化变形的区域明显不协调，初始应力法的模拟结果更合理。随着水位上升，上游坝壳料的湿化变形致使坝顶出现拉应力区。因此，湿化变形是坝顶裂缝的直接成因，在堆石料湿化变形模拟中应优先采用初始应力法。
