中文摘要：

高土石围堰塑性混凝土材料物理力学特性直接关系到围堰的正常运行和水利工程的施工安全,其各项力学指标与龄期有着颇为密切的关系。本文以三峡工程二期上游围堰防渗墙材料为研究对象,分析两种塑性混凝土的不同配合比,并提出相关的测试方法,分别对试样进行单轴试验和三轴试验。试验表明,随着龄期的增长,塑性混凝土抗压强度和初始切线模量均有较大的增长,但抗压强度增长较快,初始切线模量增长较慢;弹强比随龄期的增长有降低的趋势,并且逐渐趋于稳定;随着龄期的增长,材料的渗透系数逐渐减小。

英文摘要：

Operation and safety of high earth-rock cofferdam is closely related with plastic concrete mechanical properties that depend on concrete age. This paper analyzes mixture ratio for two kinds of plastic concrete and puts forward its test method, in combination with a study of impervious wall material for the upstream cofferdam of the Three Gorges project in stage II. The results of uniaxial and triaxial compression tests for the two concretes indicate that the compressive strength and initial tangent modulus of flexible material increase significantly with the age, with a greater increase in compressive strength, and that the ratio of modulus over strength decreases with the age and gradually approaches a stable state. The permeability coefficient decreases gradually with the age.