高土石围堰塑性混凝土的力学特性与龄期和施工安全的关系  

Relationship of construction safety and mechanical properties versus age of plastic concrete in high earth-rock cofferdam

作　　者：孙开畅[1] 田斌[1] 孙志禹 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]中国长江三峡集团科技环保部,湖北宜昌443002

出　　处：《水力发电学报》2012年第5期250-253,265,共5页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金项目(51079078);"十一五"国家科技支撑计划课题(2008BAB29B02)

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。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.

关 键 词：水工材料 力学特性 试验研究 施工安全 塑性混凝土 

分 类 号：TU43[建筑科学—岩土工程]