دانلود رایگان مقاله پیشرفت فنی در تحقیق برای ایمنی بتن در مواجهه با سنگریزه سد

Abstract

The concrete-faced rockfill dam (CFRD) is an important dam type in the selection of high dams to be constructed in Western China, owing to its direct utilization of local materials, good adaptability, and distinct economic advantages. Over the past decades, China has gained successful experience in the construction of 200 m CFRDs, providing the necessary technical accumulation for the development of 250–300 m ultra-high CFRDs. This paper summarizes these successful experiences and analyzes the problems of a number of major 200 m CFRDs around the world. In addition, it discusses the key technologies and latest research progress regarding safety in the construction of 250–300 m ultra-high CFRDs, and suggests focuses and general ideas for future research.

4. Conclusions

Over the past decades, China has obtained successful experience in the construction of 200 m high CFRDs. Recently, systematic studies have been performed on the adaptability and key safety construction technologies of 250–300 m ultra-high CFRDs. Abundant and innovative results have been achieved, which demonstrate the safety of 250 m ultra-high CFRDs and the effectiveness of related engineering measures. Subsequent studies will focus on constitutive models of rockfill and scale effects, dam stress and deformation analyses based on mesomechanics, the transmission mechanism of non-uniform deformation in the cushion and transitional zones, the mechanism of face slab extrusion damage and control measures, large-scale testing technologies, and practical safety monitoring instruments for 300 m dams. With the progress of preliminary research on the Gushui and Cihaxia projects, China’s high CFRD technology is achieving a breakthrough from 230 m to 250 m. We believe that, with a combination of practice, study, and research, along with stepwise advancement, China will achieve successive breakthroughs from 230 m to 250 m, then from 250 m to 270 m, and will finally construct and operate 300 m ultra-high CFRDs safely.