土石坝基础塑性混凝土防渗墙材料力学特性研究

本文通过大量的试验着重研究四周压力对塑性混凝土力学特性的影响，提示了塑性混凝土在四周压力加大时呈塑性破坏，其强度、峰值应变有极大的增加，而其初始模量基本无变化的特性、依据试验资料求得的参数，对一典型高土石坝深覆盖层塑性混凝土防渗墙的应力、位移进行了有限元计算，用剪应力动用水平和拉应力值判断其强度方面的安全程度，上述工作为塑性混凝土在中、高土石坝深覆盖层防渗墙中应用的可能性和合理性提供了重要论据。

Study on mechanical properties of plastic concrete for cut off wall

A series of triaxial compression tests on plastic concrete samples has been conducted to investigate its mechanical properties.The test results show that as the confining pressure increases,the strength and strain at peak stress of plastic concrete increase tremendously and its initial modulus has little change.At the same time the failure mode is a plastic-shearing one under confining pressure.These are different from the previous result of plastic concrete being brittle and low strength obtained from unconfined compression test,of which the condition does not satisfy with the real stress condition of the diaphragm in situ.The study suggested an important idea of using plastic concrete instead of common concrete to build deep diaphragm under high earth-rockfill dam.This has been proved by the stress-displacement analysis for a high earth-rockfill dam with deep alluvium having a cut off by F. E. M..