面板坝周边缝开裂自愈防渗特性研究

Study of Self-healing Seepage Prevention Characteristics of Peripheral Joints of a Concrete Face Rock-fill Dam

针对湖北水布垭230m级高面板堆石坝工程,主要研究了在周边缝的止水结构一旦失效后不同堵缝材料自愈防渗特性,得出用粉煤灰作堵缝材料,能明显地减少周边缝的漏水量。水力比降达400左右时,在下游反滤的截堵下能有效地使裂缝淤塞而自愈并承受很高的水力比降。建议级配的垫层料和小区料也能长期稳定地对粉煤灰起反滤作用。

This paper makes a special study of the self-healing seepage control properties of various sealing materials when once the waterstops installed along the peripheral joints do not work based on the Shuibuya concrete face rock-fill dam, 230m high in Hubei province. The study results indicate that flyash proves a good seepage control material, which can greatly reduce the seepage of the peripheral joints. It helps cause the joints to silt up and self-heal to resist high hydraulic gradient even when the hydraulic gradient is as high as about 400. Both cushion material and local zone material in proposed grain size also have long and stable filtering function on flyash.