混凝土重力坝-水库系统非线性动力响应试验研究

Experimental study on non-linear dynamic response of concrete gravity dam-reservoir system

本文旨在通过小尺度模型(1:150)的实验室方法,研究混凝土重力坝-水库系统的非线性响应。为了保持相似性,采用适当的水泥、砂、膨润土和水的配比确定模型坝的特征,大坝-水库模型能够传递水库水的水动力,且无水渗透。研究分别对空水和满水情况下的大坝-水库系统进行试验,以观察大坝的基本行为、裂缝形成、裂缝张开、裂缝平面滑动和裂缝稳定性模型,采用损伤塑性模型进行数值分析。研究忽略了刚性坝基础的影响,计算了大坝模型的特征频率和由拉伸损伤引起的裂缝扩展,并与试验值进行了比较。结果表明,所建立的大坝-水库系统实验模型是准确的。

This paper aims to study the nonlinear response of concrete gravity dam-reservoir system by using a small scale model(1:150).In order to maintain the similarity,the characteristics of the model dam are determined by appropriate proportions of cement,sand,bentonite and water.The dam-reservoir model can transfer the hydrodynamic force of reservoir water without water infiltration.Experiments were conducted on the dam reservoir system with empty water and full water respectively to observe the basic behavior of the dam,crack formation,crack opening,crack plane sliding and fracture stability models.The damage plastic model was used for numerical analysis.The influence of rigid dam foundation is ignored,and the characteristic frequency and crack propagation caused by tensile damage are calculated and compared with experimental values.The results show that the experimental model of dam-reservoir system is accurate.