彭泽核电厂砂岩动力学试验研究

Experimental study on sandstone dynamics of Pengze Nuclear Power Plant

对江西彭泽核电厂一期工程主厂区的细砂岩和含砾石英砂岩进行了单轴循环加卸载试验,研究了2种岩性的阻尼比和动弹性模量与幅值、频率和深度之间的关系.结果表明：细砂岩和含砾石英砂岩在相同幅值变化范围和相同频率变化范围下,其阻尼比和动弹性模量的变化趋势类似;在不同幅值下,2种岩性的动参数不同;当循环频率在0.01~1.0 Hz范围内变化时,随着频率的增大,滞回环面积和阻尼比都会增大,而动弹性模量基本不变;细砂岩的动参数随深度基本不变,而含砾石英砂岩的动弹性模量随着深度的增加而减小,阻尼比反之.

Uniaxial cyclic loading-unloading tests on fine-grained sandstone and quartz sand with gravel in the main plant of the first stage project of Pengze Nuclear Power Plant in Jiangxi Province were performed.The variations of damping ratio and dynamic elastic modulus of the two kinds of rocks with frequency,amplitude and depth were studied.The test results show that under the same amplitude and frequency ranges,the variation trends of the damping ratio and the dynamic elastic modulus of the fine-grained sandstone are similar to those of the quartz sand with gravel.Under different amplitudes,the dynamic parameters of the two kinds of rocks are different.When the cyclic frequency changes from 0.01 to 1.0 Hz,the hysteresis loop area and the damping ratio of the two kinds of rocks both increase with the increase of the frequency,while the dynamic elastic modulus almost does not change.The dynamic parameters of the fine-grained sandstone does not change with the depth,while the dynamic elastic modulus of quartz sand with gravel decreases with the increase of the depth and its damping ratio increases with the increase of the depth.