抛石磨圆度对沙枕破坏影响离心模型试验研究  

Centrifugal model test study on effect of riprap roundness on sand pillow damage

作　　者：李丹[1] 谭玄 胡波[2] 刘林双 LI Dan;TAN Xuan;HU Bo;LIU Linshuang(College of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Key Laboratory of Geotechnical Mechanics and Engineering of Water Resources Ministry,Changjiang River Scientific Research Institute,Wuhan 430010,China;Changjiang Waterway Institute of Planning and Design,Wuhan 430040,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [3]长江航道规划设计研究院,湖北武汉430040

出　　处：《人民长江》2020年第7期206-211,共6页Yangtze River

基　　金：国家重点研发计划项目(2016YFC0402105);国家自然科学基金青年基金资助项目(51709017)。

摘　　要：沙枕结合抛石的工程结构在护岸、护滩(底)工程中应用广泛,可达到防冲促淤的效果。但施工时,抛石冲击作用易使沙枕发生破坏,从而影响工程效果,其中块石磨圆度的影响不容忽视。通过离心模型试验研究了不同磨圆度块石在不同冲击能量下对沙枕袋的破坏影响。试验结果表明:在冲击能量不断增大的条件下,抛投磨圆度较好的卵石对沙枕袋的损伤会不断增大;抛投磨圆度较差的碎石对沙枕袋的损伤会随着冲击能量的增大逐渐逼近材料自身承冲下限;离心机加速度小于35 g时,块石对沙枕袋的损伤影响比较明显,离心机加速度超过35 g后,随着冲击能量的增大,抛石磨圆度的影响已逐渐减小。The engineering structure of sand pillow combined with riprap is widely used in revetment and beach protection(bottom) engineering to achieve the effect of anti-scouring and siltation. However, during construction, the impact of riprap falling is easy to cause damage to the sand pillow, which affects the engineering effect, so the influence of the riprap roundness can not be ignored. We analyzed the effects of different roundness riprap on the damage of sand pillow bags under different impact energy conditions by centrifugal model test. The results indicated that with increasing impact energy, the impact damage of the pebble with good roundness on the sand pillow bag will increased continuously. The damage effect of the gravel with poor roundness on the sand pillow bag will gradually approach the strength limit of the material as the impact energy increased. When the centrifuge acceleration exceeded 35 g, the damage effect was basically the same no matter the roughness, while the centrifuge acceleration was less than 35 g, the roundness of the stone had obvious influence on the damage of the sand pillow bag. After the centrifuge acceleration exceeded 35 g, the influence of the roundness was gradually reduced with the increase of the impact energy.

关 键 词：沙枕 抛石 离心模型试验 磨圆度 冲击能量 

分 类 号：TV32[水利工程—水工结构工程]