管袋坝袋间接缝坝芯吹填砂流失模型试验  

Experimental study on dam core sand scouring through seams between tubes of a geotube dam

作　　者：满晓磊 束一鸣[2] 曹明杰[2] 蔚成亮[2] 郝雪航 李少鹏 毛文龙[2] 

机构地区：[1]滁州学院地理信息与旅游学院,安徽滁州239000 [2]河海大学水利水电学院,江苏南京210098

出　　处：《水利水电科技进展》2018年第1期28-35,共8页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51179065);国家“十二五”科技支撑计划(2012BAB03B02);江苏省高校优势学科建设工程项目(PAPD)

摘　　要：针对管袋坝坝芯吹填砂沿袋间接缝流失问题,采用自行研制的管袋坝袋间接缝坝芯吹填砂流失模型试验研究装置,进行了单向流和波浪工况下管袋坝袋间接缝坝芯吹填砂流失物理模型试验,分析了不同工况下的颗粒运移规律和冲刷稳定性。试验结果表明:单向流工况下,砂颗粒的流失方式为"槽沟式";波浪工况下,冲刷过程以拱结构空间的出现、形成和坍塌为标志划分为冲击、成拱、稳定3个阶段;选择袋间接缝内砂堆长度作为判定管袋坝袋间接缝冲刷稳定性的判定指标,通过比较实际工程中管袋坝袋间接缝长度与接缝内砂堆长度可以判断波浪工况下的冲刷稳定性。To study the problem of sand erosion through seams between geotubes, erosion stability of the backfill sand inside the dam core was carried out by a self-developed experimental apparatus. The physical model test was performed in unidirectional flow conditions and wave conditions. The transport characteristics of sand particles and scouring stability were analyzed. Experimental results show that in the condition of unidirectional flow,the process and mechanism of sand particle erosion has a “ groove type冶 characteristic. In the condition of wave flow, arch-like structures will appear, form and collapse and correspondingly the erosion process can be divided into three stages of lashing, arching and stability. The critical length of the sand pile inside the seams between tubes was chosen as a criterion parameter to determine the erosion stability of seams between geotubes. The scouring stability in wave flow conditions can be determined by comparing the length of the seam between geotubes and the length of the sand pile inside the seam in real engineering works.

关 键 词：管袋坝 袋间接缝 坝芯 吹填砂 冲刷稳定 模型试验 

分 类 号：TV641.2[水利工程—水利水电工程]