| Studies on parallel seismic testing for integrity of cemented soil columns |
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| 作者姓名： | HUANG Da-zhi CHEN Long-zhu |
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| 作者单位： | Institute of Engineering Safety and Disaster Prevention，Dept. of Civil Engineering，Shanghai Jiao Tong University，Shanghai 200240，China |
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| 基金项目： | Project （No. 50478022） supported by the National Natural Science Foundation of China |
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| 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.
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| 关 键 词： | 平行地震测试 水泥柱 整体性测试 数字模拟 |
| 收稿时间： | 10 February 2007 |
| 修稿时间： | 2007-02-10 |
Studies on parallel seismic testing for integrity of cemented soil columns |
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| HUANG Da-zhi CHEN Long-zhu.Studies on parallel seismic testing for integrity of cemented soil columns[J].Journal of Zhejiang University Science,2007,8(11):1746-1753. |
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| Authors: | Huang Da-zhi Chen Long-zhu |
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| Institution: | (1) Institute of Engineering Safety and Disaster Prevention, Dept. of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China |
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| Abstract: | 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. |
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| Keywords: | Parallel seismic (PS) testing Cemented soil columns Integrity testing Numerical simulation |
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