Yu Jia'ao, Shen Zhenzhong, Xu Liqun, He Chuankai
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210024, China.
The College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China.
Materials (Basel). 2022 May 13;15(10):3520. doi: 10.3390/ma15103520.
The deterioration of mortar has an adverse impact on the deformation and stress state of the masonry arch dam, after freeze-thaw cycles, in long-term operation. The purpose of this paper is to investigate the effect of reinforcement grouting on the stress of a thin masonry arch dam and propose a reasonable grouting method in the case of mortar deterioration. The determination of the ultimate grouting pressure is another main focus. The masonry material was generalized by combining a linear elastic model and the proportional weighted average under the condition of deterioration caused by freeze-thaw cycles. A series of analytical methods were proposed for the research of grouting effect on dam stress, based on which the ultimate grouting pressure is calculated in various cases. Results demonstrate that the dam tensile stress may exceed the allowable value in the following operation. Then, some recommended methods for the grouting layout and the estimation of grouting pressure were put forward by integrating the grouting field test with numerical analysis for reinforcement. The research conclusions might have a guiding significance for the reinforcement of similar projects.
在长期运行且经历冻融循环后，砂浆劣化会对浆砌石拱坝的变形和应力状态产生不利影响。本文旨在研究加固灌浆对薄浆砌石拱坝应力的影响，并针对砂浆劣化情况提出合理的灌浆方法。确定极限灌浆压力是另一个主要关注点。在冻融循环导致劣化的条件下，通过将线性弹性模型与比例加权平均相结合来对砌体材料进行概化。针对灌浆对坝体应力的影响研究提出了一系列分析方法，并据此计算各种情况下的极限灌浆压力。结果表明，在后续运行中坝体拉应力可能超过允许值。然后，通过将灌浆现场试验与加固数值分析相结合，提出了一些关于灌浆布置和灌浆压力估算的推荐方法。研究结论可能对类似工程的加固具有指导意义。
