水泥改良黏性土的循环动力特性

Dynamic Characteristics of Cement-improved Cohesive Soil Under Cyclic Loading

利用小型振动三轴压缩仪对水泥改良黏性土开展循环振动压缩试验,包括动弹模与阻尼比试验和动强度试验.通过试验研究加载频率和围压对水泥改良黏性土的动弹模、阻尼比和动强度的影响,从而得到加载频率和围压对水泥改良黏性土循环动力特性的影响规律.试验结果表明,随着加载频率的增大,水泥改良黏性土的最大动弹模、最大阻尼比和动强度均增大;随着围压的增大,水泥改良黏性土的最大动弹模和动强度均增大,而最大阻尼比减小.

In order to obtain the influence of loading frequency and confining pressure on dynamic characteristics of cement-improved cohesive soil under cyclic dynamic loading,cyclic dynamic tri-axial compressive tests under different confining pressure and loading frequency were conducted using small-scale dynamic tri-axial compressive apparatus.Dynamic modulus,damping ratio and dynamic strength of the soil were obtained by the tests.The relations between the maximum dynamic modulus,the maximum damping ratio,dynamic strength of the soil and the loading frequency as well as those between the maximum dynamic modulus,the maximum damping ratio,the dynamic strength and the confining pressure were gained according to test results.The test results show that,with the increase of loading frequency,the maximum dynamic modulus,the maximum damping ratio and the dynamic strength increase.With the increase of confining pressure,the maximum dynamic modulus and the dynamic strength increase while the maximum damping ratio decreases.