Studies on parallel seismic testing for integrity of cemented soil columns  

作　　者：HUANG Da-zhi CHEN Long-zhu 

机构地区：[1]Institute of Engineering Safety and Disaster Prevention, Dept. of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2007年第11期1746-1753,共8页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project (No. 50478022) supported by the National Natural Science Foundation of China

摘　　要：The principle and process of parallel seismic (PS) testing for the integrity testing of cemented soil columns are in- troduced in this paper. A three-dimensional (3D) finite element model (FEM) for the pile-soil system is established for impulse responses. Under saturated soil or unsaturated soil condition, several vibrating velocity-time histories at different depths in parallel hole are obtained based on the numerical simulation. It shows that the length of the pile and the one-dimensional (1D) P-wave velocity in the pile can be determined easily from the features of the mentioned velocity-time histories. By examining the slopes of the first arrival time plotted versus depth or the depth where the amplitude of the first arrival significantly decreases, the length of the pile can be determined. The effects of the 3D P-wave propagation through the saturated soil and the defect of the cemented soil column on the velocity-time histories are also investigated.The principle and process of parallel seismic （PS） testing for the integrity testing of cemented soil columns are introduced in this paper. A three-dimensional （3D） finite element model （FEM） for the pile-soil system is established for impulse responses. Under saturated soil or unsaturated soil condition, several vibrating velocity-time histories at different depths in parallel hole are obtained based on the numerical simulation. It shows that the length of the pile and the one-dimensional （1D） P-wave velocity in the pile can be determined easily from the features of the mentioned velocity-time histories. By examining the slopes of the first arrival time plotted versus depth or the depth where the amplitude of the first arrival significantly decreases, the length of the pile can be determined. The effects of the 3D P-wave propagation through the saturated soil and the defect of the cemented soil column on the velocity-time histories are also investigated.

关 键 词：Parallel seismic （PS） testing Cemented soil columns Integrity testing Numerical simulation 

分 类 号：TU473.1[建筑科学—结构工程] TU311.3[建筑科学—土工工程]