激振面积对低应变动测法影响的数值研究
PDF下载 (7350)戚惠民.激振面积对低应变动测法影响的数值研究[J].宁波大学学报(理工版),2018,31(5):63-66.DOI:
QI Hui-min.Numerical study on the effects of excitation area on low-strain integrity test[J].Journal of Ningbo University(Natural Science & Engineering Edition),2018,31(5):63-66.DOI:
| Title: | Numerical study on the effects of excitation area on low-strain integrity test |
| 作者: | 戚惠民 |
| Author(s): | QI Hui-min |
| 关键词: | 有限元; 横向尺寸; 低应变反射法; 激振面积 |
| Keywords: | finite element; horizontal size; low-strain integrity test; excitation area |
| 分类号: | TU43 |
| 文献标识码: | A |
| 摘要: | 利用ABAQUS有限元软件建模, 分析了基桩横向尺寸对低应变检测的影响. 结果表明: (1)在建模过程中, 当桩端土厚度及桩周土半径达到桩长的1/2以上时, 计算所得数值解可以收敛稳定; (2)基桩横向尺寸对低应变法检测有显著影响, 具体与施加激振面积相关, 当激振面积较大时, 横向尺寸影响能有效弱化; (3)通过实测曲线与数值解比较, 二者较为吻合, 本文所述规律和方法对工程实践具有一定指导意义. |
| Abstract: | Effects of horizontal size on low strain integrity test was studied based on ABAQUS finite element modeling. The results show that: (1) In the modeling process, when the soil thickness of pile bottom and the soil radius around pile reach half the length of pile, numerical solution can be converged and stabilized. (2) Horizontal size has a significant influence on low strain integrity test, and as the area of excitation increases, the influence can be effectively weakened. (3) The measured curve is in good agreement with the numerical solutions, therefore the laws and methods proposed above are instructive for engineering. |
| 参考文献 /References: | [1] Novak M, Aboul-Ella F. Impedance functions of piles in layered media[J]. Journal of the Engineering Mechanics Division, 1978, 104(3):643-661. [2] Gough W, Richard J P G, Williams R P. Vibration and Waves[M]. New York: Halsted Press, 1983. [3] Koten H V, Middendorp P, Brederode P V. An analysis of dissipative wave propagation in a pile[C]. International Seminar on the Application of Stress Wave Theory on Piles, 1980. [4] 王奎华, 谢康和, 曾国熙. 有限长桩受迫振动问题解析解及其应用[J]. 岩土工程学报, 1997, 19(6):27-35. [5] 胡昌斌, 王奎华, 谢康和. 基于平面应变假定基桩振动理论适用性研究[J]. 岩土工程学报, 2003, 25(5):595-601. [6] 吴文兵. 基于虚土桩法的桩土纵向耦合振动理论及应用研究[D]. 杭州: 浙江大学, 2012. [7] 陈安国, 刘东甲. 基桩低应变检测的波动方程法数值计算[J]. 合肥工业大学学报(自然科学版), 2007, 30(10): 1336-1340. [8] 费康, 刘汉龙, 张霆. PCC桩低应变检测中的三维效应[J]. 岩土力学, 2007, 28(6):1095-1102. [9] 何伟杰, 杨冬英, 崔周飞. 考虑横向惯性下桩的纵向振动理论解和数值解对比分析[J]. 岩土力学, 2017, 38(9):2757-2763. [10] 张智卿, 王奎华, 谢康和, 等. 成层非饱和土中桩的纵向振动特性分析[J]. 科技通报, 2007, 23(1):88-96. |
| 备注/Memo: | 收稿日期: 2018－03－16. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 作者简介: 戚惠民（1964－）, 男, 上海人, 工程师, 主要研究方向: 水文地质和工程地质. E-mail: 415588869@qq.com 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
