【摘要】：利用MTS-810型振動(dòng)三軸試驗(yàn)機(jī)對(duì)不同加載頻率、圍壓和溫度下凍結(jié)黏土和凍結(jié)黃土的阻尼比變化規(guī)律進(jìn)行研究。結(jié)果表明:不同頻率、圍壓和溫度下,對(duì)于凍結(jié)黏土,隨動(dòng)應(yīng)變幅的增大,阻尼比呈先減小再緩慢增大的變化趨勢;對(duì)于凍結(jié)黃土,阻尼比隨動(dòng)應(yīng)變幅的增加先減小再逐漸保持不變。相同動(dòng)應(yīng)變幅下,凍結(jié)黏土和凍結(jié)黃土的阻尼比隨加載頻率的增加而減小,隨圍壓的增加變化不大,溫度為?0.2~?1℃時(shí),阻尼比的變化規(guī)律不明顯,溫度為?2℃時(shí),阻尼比的取值顯著小于?0.2~?1℃時(shí)的阻尼比取值。當(dāng)動(dòng)應(yīng)力水平較低時(shí),阻尼比受頻率的影響程度較大;當(dāng)動(dòng)應(yīng)力水平較高時(shí),阻尼比受溫度的影響程度較大;在整個(gè)加載過程中,阻尼比受圍壓的影響程度最小。當(dāng)動(dòng)應(yīng)變幅較小時(shí),頻率對(duì)凍結(jié)黃土的影響程度要大于凍結(jié)黏土,隨動(dòng)應(yīng)力水平的增高,凍結(jié)黃土受頻率的影響程度逐漸小于凍結(jié)黏土。在整個(gè)加載過程中,溫度對(duì)凍結(jié)黃土的影響程度大于凍結(jié)黏土,而圍壓對(duì)凍結(jié)黃土的影響程度小于凍結(jié)黏土。
[Abstract]:The variation of damping ratio of frozen clay and frozen loess under different loading frequency, confining pressure and temperature was studied by using MTS- 810 vibration triaxial testing machine. The results show that the damping ratio decreases at first and then increases slowly with the increase of dynamic strain amplitude for frozen clay at different frequencies, confining pressure and temperature. For frozen loess, the damping ratio decreases first with the increase of dynamic strain amplitude and then remains constant gradually. Under the same dynamic strain amplitude, the damping ratio of frozen clay and frozen loess decreases with the increase of loading frequency, but does not change much with the increase of confining pressure. When the temperature is-0.2 鈩，

本文編號(hào)：2472608