陈村水电站坝基丙凝加强帷幕的防渗时效分析

丙凝是一种曾流行过的化灌材料，形成帷幕体的防渗时效如何过去还很少有报道和研究。本文以陈村水电站为例，根据多年的观测资料、现场调查及室内测试等成果，经过综合分析，指出第７－１７坝段丙凝加强帷幕的总体防渗减压效果是显著的且较稳定的。但局部的防渗效果是在衰减。今后，对这种异常部位应加强观测，以确保大坝的安全运行。

ANALYSIS OF TIME-VARIANT EFFECT OF ANTI-SEEPAGE OF CURTAIN-GROUTING WITH ACRYLAMIDE

Acrylamide is a kind of chemical material which was used for curtain-grouting in many hydroelectric projects. However the time-variant effect of the material has been studied rarely. Taken Chencun Water Power Station as an example, it is studied synthetically on the basis of the detailed monitoring data, investigation in situ, and analysis in Lab. It is pointed out that the effect of anti-seepage and uplift pressure reduced due to acrylamide curtain under dam sections 7 to 17 in generally good and steady state. However, its effect of anti-seepage seems to be weakened locally.The special attention should be paid to this abnormal phenomenon and if necessary, some observation and measures must be taken,so as to ascertain the normal operation of the project.