【摘要】 本文报导了现场和室内测定黄壁庄副坝填土的动力变形特性的结果。黄壁庄副坝是用水中倒土法填筑的黄土均质坝,于1966年完建,1984年在现场用跨孔法测定了坝体填土的最大动剪模量,深度达到18m,在室内进行了原状土的共振柱试验。固结时间效应对动剪模量是一个重要影响因素,考虑现场土体与室内试验的固结时间不同而对室内动剪模量进行修正后所估算的值,与现场动剪模量相当接近。综合整理现场与室内试验结果,取得了对于该土坝来说较为可靠的最大动剪模量与二维平均有效应力的关系。本文并给出了饱和度80％左右的该土坝填土的动剪模量比和阻尼比两者对剪应变幅的关系。引用参考剪应变整理试验资料,可以使得这两个关系曲线很好地加以归一化。更多还原

【Abstract】 The dynamic deformation properties of loess fill for Huangbizhuang auxiliary earth dam, which was built in 1966 by the method of dumping soil into ponded water,were measured on the site and in the laboratory. Cross-hole seismic tests were performed in-situ up to a depth of 18m in 1984 and undisturbed soil samples were tested by a resonant column device in laboratory. All these results are presented in the paper. The secondary consolidation time effect on the maximum dynamic shear modulus is also reported. When the laboratory dynamic shear moduli are corrected for considering the difference between the durations of consolidation in-situ and in laboratory, the values obtained are close to the in-situ dynamic shear moduli. A reliable relation between the maximum dynamic shear modulus and the average of the two effective principal stresses applied in the directions of wave propagation and particle motion respectively is established for the dam by combining the in-situ and laboratory test results. Both dynamic shear modulus ratio and damping ratio versus shear strain amplitude relations are presented and it is found that the relations could be normalized quite well by using the reference shear strain for the loess fill with about 80% of saturation degree.更多还原