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通过动三轴试验,研究了橡胶水泥土复合试样的动强度、动弹性模量和阻尼比等动力参数的变化规律,着重研究了橡胶粉掺量、围压和应变3个主要因素的影响并分析了内在机理。在围压不变的情况下,随着橡胶粉掺量的增大,橡胶水泥土复合试样动强度降低。围压越大,动强度越高,受橡胶粉掺量的影响越小。随着围压的增大,动弹性模量增大而阻尼比减小;随着橡胶粉掺量的增加,动弹性模量减小而阻尼比增大。通过数据拟合,得到了橡胶水泥土动弹性模量和阻尼比的计算公式。橡胶粉可以提高水泥土吸收能量的能力,采用橡胶水泥土作为地基处理材料时,能够起到减震的作用。
The dynamic and triaxial tests were used to study the variation of dynamic parameters such as dynamic strength, dynamic elastic modulus and damping ratio of rubber cement-soil composite specimens. The effects of three main factors on rubber powder content, confining pressure and strain were studied emphatically And analyzed the internal mechanism. With the confining pressure unchanged, with the increase of the content of rubber powder, the dynamic strength of rubber-cement-soil composite specimens decreased. The larger the confining pressure, the higher the dynamic strength, the less affected by the amount of rubber powder. With the increase of confining pressure, the dynamic elastic modulus increases and the damping ratio decreases. With the increase of rubber powder content, the dynamic elastic modulus decreases and the damping ratio increases. Through the data fitting, the formula of dynamic modulus and damping ratio of rubber cement soil is obtained. Rubber powder can improve the ability of cement soil to absorb energy, rubber cement soil as a foundation treatment material, can play the role of shock absorption.