砾类土动弹性模量和阻尼比的影响因素试验研究

Experimental study on influence factors of gravel soil dynamic elastic modulus and damping ratio

含水率、围压、压实度、初始静偏应力和循环荷载作用频率是影响动弹性模量和阻尼比的重要因素,通过动三轴试验分析这些因素对砾类土动弹性模量和阻尼比的影响并得出了相关规律,围压和压实度越大,含水率越接近最佳含水率,动弹性模量越大,阻尼比越小。0~10 kPa范围的初始静偏应力对砾类土的动弹性模量和阻尼比影响较小。循环荷载作用频率在1~2 Hz变化时,砾类土的动弹性模量和阻尼比也变化较小。给出了砾类土的动弹性模量幂函数模型参数,得出不同条件时模型参数的变化规律。

Water content, confining pressure, compaction degree, the initial static deviatoric stress and cyclic loading frequency are important factors that affect the dynamic elastic modulus and damping ratio. The dynamic triaxial experiments were conducted to study the effects of these factors on the gravel soil dynamic elastic modulus and damping ratio, and then the laws were gotten. Dynamic elastic modulus is bigger and damping ratio is smaller when confining pressure and compaction degree is higher and moisture content is close to the optimal water content rate. Dynamic elastic modulus and damping ratio have fewer changes when the initial static deviator stress is changing from 0 kPa to 10 kPa. Dynamic elastic modulus and damping ratio also have little difference when cyclic loading frequency is changing from 1 Hz to 2 Hz. Power function models of dynamic elastic modulus of gravel soil were given and the change rules of parameters were gotten under different conditions.