Numerical simulation of shear-wave seismic vibrator-ground coupled vibration system
PENG Xun1, HAO Lei2
1. School of Mechanical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 2. BGP Inc., China National Petroleum Corporation, Zhuozhou, Hebei 072751, China
Abstract：The interaction between the shear-wave seismic vibrator and the ground is complicated， and involves uneven contact， soil plasticity， friction， and burial depth. However， there are rare references in the systematic research on the coupled vibration of the shear-wave vibrator-ground systems. Thus， this paper builds a three-dimensional numerical simulation model of a shear-wave seismic vibrator-ground system considering multiple nonlinear factors. The coupled vibration characteristics of the system are analyzed from aspects of the strain distribution and deformation at the contact interfaces， the vibration output force， the shear wave propagation， and the energy transfer characteristics. Meanwhile， the effects of soil types， elastic modulus， and cohesion on the response characteristics of the system are investigated. The results show that there is contact asymmetry between the vibrator plate and ground due to the load mode and the soil plastic deformation， which can bring about local decoupling of the plate. The effective output force of the vibrator is only a part of the contact force， and there are obvious harmonic distortions in the generated seismic waves. The effective energy transferred from the shear-wave vibrator to the ground is limited， with a low effective energy transfer ratio of the coupling system. The soil parameters have a significant influence on the vibrator output and energy transfer characteristics， and the vibrator operates better in clay soil. Additionally， the soil elastic modulus is the main controlling factor for the vibrator plate decoupling， while increasing the soil cohesion can improve the energy transfer characteristics of the system. Therefore， numerical simulation can analyze the coupled vibration characteristics of the shear-wave vibrator-ground system， providing theoretical references for the structural design and optimization of the vibrators.
唐玮,冯金德,丁麟.构建油气“双循环”发展格局的思考[J].石油科技论坛,2020,39(6):13-17.TANG Wei,FENG Jinde,DING Lin. Thoughts on China's oil and gas “double-circulation” development pattern[J]. Petroleum Science and Technology Forum,2020,39(6):13-17.
[2]
王赟,文鹏飞,李宗杰,等.多分量油气地震勘探技术急需解决的几个问题[J].石油地球物理勘探,2020,55(6):1395-1406.WANG Yun,WEN Pengfei,LI Zongjie,et al.Several urgent problems faced by muti-component seismic in oil and gas exploration[J].Oil Geophysical Prospec-ting,2020,55(6):1395-1406.
[3]
苟量,张少华,李向阳.提高横波勘探有效性引领物探技术创新[J].石油科技论坛,2021,40(4):12-19.GOU Liang,ZHANG Shaohua,LI Xiangyang.Improving the effectiveness of shear-wave seismic exploration through geophysical technology innovation[J].Petroleum Science and Technology Forum,2021,40(4):12-19.
[4]
倪宇东,王井富,马涛,等.可控震源地震采集技术的进展[J].石油地球物理勘探,2011,46(3):349-356.NI Yudong,WANG Jingfu,MA Tao,et al.Advances in vibroseis acquisition[J].Oil Geophysical Prospec-ting,2011,46(3):349-356.
[5]
佟训乾,林君,姜弢,等.陆地可控震源发展综述[J].地球物理学进展,2012,27(5):1912-1921.TONG Xunqian,LIN Jun,JIANG Tao,et al.Summary of development of land vibrator[J].Progress in Geophysics, 2012,27(5):1912-1921.
[6]
公亭,王兆磊,罗文山,等.横波源三维地震资料矢量横波四分量旋转和快慢波分离技术[J].石油地球物理勘探,2022,57(5):1028-1034.GONG Ting,WANG Zhaolei,LUO Wenshan,et al.Four-component rotation and fast-slow wave separation techniques for 3D vector S-wave seismic data of S-wave sources[J].Oil Geophysical Prospecting,2022,57(5):1028-1034.
[7]
张少华,邓小江,冯许魁,等.川南地区深层页岩气地球物理勘探技术新进展与攻关方向[J].石油地球物理勘探,2023,58(1):238-248.ZHANG Shaohua,DENG Xiaojiang,FENG Xukui,et al.New progress and research direction of geophysical prospecting techniques for deep shale gas in southern Sichuan Basin[J].Oil Geophysical Prospecting,2023,58(1):238-248.
[8]
王光德,徐小刚.横波可控震源应用浅析[J].物探装备,2018,28(3):157-160.WANG Guangde,XU Xiaogang.Analysis of the application of shear-wave vibrator[J].Equipment for Geophysical Prospecting,2018,28(3):157-160.
[9]
郝磊,刘志刚,黄玉峰,等.一种横波可控震源振动器结构及其性能分析[J].物探装备,2021,31(5):311-313.HAO Lei,LIU Zhigang,HUANG Yufeng,et al.A kind of S-wave seismic vibrator shaker and its performance analysis[J].Equipment for Geophysical Prospecting, 2021,31(5):311-313.
SALLAS J J. Seismic vibrator control and the downgoing P-wave[J]. Geophysics,1984,49(6):732-740.
[12]
LEBEDEV A V,BERESNEV I A.Nonlinear distortion of signals radiated by vibroseis sources[J].Geophysics,2004,69(4): 968-977.
[13]
LEBEDEV A V,BERESNEV I A,VERMEER P L.Model parameters of the nonlinear stiffness of the vibrator-ground contact determined by inversion of vibrator accelerometer data[J].Geophysics,2006,71(3):H25-H32.
[14]
WEI Z.Modelling and modal analysis of seismic vibrator baseplate[J].Geophysical Prospecting,2010,58(1):19-31.
[15]
黄志强,李刚,陶知非,等.可控震源振动器有限元模态分析与试验验证[J].工程设计学报,2017,24(5):530-535.HUANG Zhiqiang,LI Gang,TAO Zhifei,et al.Finite element modal analysis and experimental verification of vibroseis vibrator[J].Chinese Journal of Engineering Design,2017,24(5):530-535.
[16]
黄志强,彭珣,李刚.可控震源振动器平板多频响应分析[J].工程设计学报,2017,24(6):648-654.HUANG Zhiqiang,PENG Xun,LI Gang.Analysis of multi-frequency response of vibroseis vibrator baseplate[J].Chinese Journal of Engineering Design,2017,24(6):648-654.
[17]
丁雅萍,黄志强,李刚.基于有限元法的KZ-28型振动器平板结构优化与性能研究[J].机械设计与制造,2016,(11):205-208.DING Yaping,HUANG Zhiqiang,LI Gang.Research on structure optimization on the performance of flat plate of KZ-28 type vibrator based on the finite element method[J].Machinery Design & Manufacture,2016,(11):205-208.
[18]
DENG Z,LI C,CHEN G,et al.The application of pure shear wave seismic data for gas reservoir delineation[C].SEG Technical Program Expanded Abstracts,2019,38:2690-2694.
[19]
PENG X,HUANG Z,SUSANA L Q,et al.Nonlinear 3D finite element analysis of a shear-wave vibrator-ground interaction system[J].Soil Dynamics and Earthquake Engineering,2021,doi:10.1016/j.soildyn.2020.106520.
[20]
Kuhlemeyer R L,LYSMER J.Finite element method accuracy for wave propagation problems[J].Journal of the Soil Mechanics and Foundation Division,1973,99(5):421-427.
[21]
肖晓春,林皋,迟世春.桩—土—结构动力相互作用的分析模型与方法[J].世界地震工程,2002,18(4):123-130.XIAO Xiaochun,LIN Gao,CHI Shichun.Analysis model and methods of pile-soil-structure dynamic inte- raction[J].World Earthquake Engineering,2002,18(4):123-130.
[22]
NADERI-BOLDAJI M,ALIMARDANI R,HEMMAT A,et al.3D finite element simulation of a single-tip horizontal penetrometer-soil interaction.Part Ⅰ:Deve-lopment of the model and evaluation of the model parameters[J].Soil and Tillage Research,2013,134(11):153-162.
[23]
LUO C,YANG X,ZHAN C,et al.Nonlinear 3D finite element analysis of soil-pile-structure interaction system subjected to horizontal earthquake excitation[J].Soil Dynamics and Earthquake Engineering,2016,84(5):145-156.
[24]
刘晶波,王振宇,杜修力,等.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.LIU Jingbo,WANG Zhenyu,DU Xiuli,et al.Three-dimensional visco-elastic artificial boundaries in time domain for wave motion problems[J].Engineering Mechanics,2005,22(6):46-51.
[25]
SUSANA L Q,JAIME P J,JUANA A T.Numerical modeling on vibroflotation soil improvement techniques using a densification constitutive law[J].Soil Dynamics and Earthquake Engineering,2014,65(S1):1-10.
