塑性混凝土墙在病险土石坝加固中的应用

Research on the Application of Plastic Concrete Walls to the Reinforcement of Dangerous Earth-Rockfill Dams in Fujian Province

经过有限元计算和对比分析,基于混凝土弹性模量越高,拉应力越大,防渗墙与坝体的变形越不协调,相应提出了病险土石坝防渗墙宜采用低弹模塑性混凝土的看法;经过长期的防渗墙材料试验和研究认为,随着水泥用量的增加,塑性混凝土强度、弹性模量增加,弹强比也略增大,极限应变则降低;根据福建省病险土石坝特点配设的塑性混凝土材料配合比和试验研究的物理力学性能指标,可供类似工程设计参考。

Based on the fact that the higher the elastic modulus of concrete is, the greater the tensile stress and the more inharmonic deformation between seepage prevention wall and the dam body will be, and through finite element computation as well as a compara- tive analysis, this paper proposes a method of using plastic concrete for seepage prevention wall of dangerous earth-rockfill dams. Through a long-term test and study of seepage prevention materials, this paper considers that along with the increase in cement con- sumption, the strength and elastic modulus of concrete will also increase, with the ratio of elastic modulus to strength becoming slightly higher, while ultimate strain dropped down. Based on the characteristics of dangerous earth-rockfill dams in Fujian Province, the mixing proportion of plastic concrete material and its physical/mechanical indexes may be used as a reference in similar engineering designs.