Wang Lan 1,2) ; Lü Jinquan 3) ; Zhu Wenjiu 3) ; and Zheng Shuiming 1,2)
1)Institute of Seismology, CEA, Wuhan 4300712)Wuhan Institute of Earthquake Engineering,Wuhan 430071 3)Beijing Orient Nova Petrochemical Engineering Co.,Ltd, Beijing 100083
Abstract On the texts of the vertical, horizontal rotary and torsional harmonic forced vibration by exciter, dynamic property of subsoil for petrochemical engineering project are measured under open and embedded conditions of concrete testing block. On the basis of testing data, the dynamic parameters of subsoil such as dynamic stiffness, dynamic stiffness coefficient, damping ratio of 1st vibration mode and mass of vibration soil are calculated. The experimental results show that the dynamic parameters under embedded condition are bigger than those under open condition. For resonance frequency of 1st vibration mode, the vertical is biggest, horizontal rotary is bigger and the torsional is smallest.It shouldn’t be ignored that the mass of vibration soil is more than total mass of testing concrete block and exciter.In the course of forced vibration, the vibration frequency of concrete testing block is not consistent with the running frequency of exciter.
