Deformation and stress of concrete cut-off wall of Hongshiyan dammed body at initial stage of water storage
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摘要: 针对堰塞湖开发利用工程安全保障等技术理论问题,以牛栏江红石岩堰塞湖综合水利枢纽为工程依托,设计提出了基于分布式光纤传感技术的堰塞坝混凝土防渗墙变形与受力监测技术及其埋设安装方法,首次实施并成功应用于红石岩堰塞坝混凝土防渗墙安全监测。分析讨论了蓄水初期堰塞坝混凝土防渗墙变形与受力规律：分布式光纤传感测量技术满足防渗墙变形受力监测需要和精度要求,蓄水初期墙体混凝土总体受压,受蓄水过程影响明显；堆石体对防渗墙的支撑力存在较多应力集中,堰塞坝堆石体材料呈明显不均匀性；蓄水初期墙体混凝土受力总体小于混凝土材料强度指标,防渗墙保有良好安全余量,可有效保障防渗墙长期变形和受力安全。Abstract: With regard to the technical and theoretical problems of development and engineering safety guarantee of landslide-dammed lakes, the deformation and stress monitoring technology of concrete cut-off wall of dammed body and its installation method based on the distributed optical fiber sensing technology are designed and proposed. It has been successfully implemented and applied to the safety monitoring of the concrete cut-off wall of Hongshiyan dammed body. The deformation and stress regulations of the concrete cut-off wall of the Hongshiyan dammed body at the initial stage of water storage are analyzed and discussed. At the initial stage of water storage, the wall concrete is subjected to pressure in general and obviously affected by the impoundment process. There is more stress concentration in the supporting force of rockfill to the cut-off wall, and the materials of dammed body are obviously inhomogeneous. At the initial stage of water storage, the stress of concrete wall is far less than the strength index of concrete materials. The cut-off wall has good safety margin, and can effectively ensure its long-term deformation and stresssafety.
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