Development of Naturalistic River Improvement with Using High Performance Durable Concrete

在过去的几十年里，预防河流灾害，如防洪和提高水力效率是主要关注的问题。直到最近，日本才指出了自然主义河流治理的必要性。本研究的主要目的是开发一种利用高性能耐久混凝土进行天然河道整治的新方法。提出了一种新型河道整治施工方法--固定点法，采用高性能多孔混凝土砌块在河道的临界之字角处施工。采用间隙级配耐久混凝土研制出适合生态环境的高性能多孔混凝土，同时进行了新型护岸的现场裸露试验和现场试验，研究了洪水灾害情况下的泥沙输移特性、泥沙特性和水工稳定性。高性能多孔混凝土对自然环境的影响，同时也证实了其抗碱溶、抗生态、抗生物侵蚀的安全性。上述应用试验的试验结果表明，高性能多孔混凝土对自然界河流的治理是有效的。

Prevention of river disaster, such as flood protection and improvement of hydraulic effectiveness were the major interest in last decades. It was only recently that the necessity of the naturalistic river improvement is pointed out in Japan. The main object of this research is to develop a new method of the naturalistic river improvement with using high performance durable concrete.Fix point method, a new type of river improvement construction method, was proposed using a high performance porous concrete block at the critical zigzag angle of river course. The high performance porous concrete, good for ecological circumstances, was developed by the durable concrete with gap-graded mixture.In-situ exposure test for the new type of revetments and field tests were conducted at the same time to investigate the behavior of sediment transportation and the sedimental property as well as hydraulic stability in the case of flood disaster. The effects of the high performance porous concrete on natural environment are simultaneously confirmed the safety against the alkali-dissolution, ecological and biological alterations. The tests results of aforementioned application experiments indicate the effectiveness to the naturalistic river improvement using high performance porous concrete.