地球物理学报
地毬物理學報
지구물이학보
2009年
12期
3042-3050
,共9页
刘雪明%凡友华%翟佳羽%刘雪峰
劉雪明%凡友華%翟佳羽%劉雪峰
류설명%범우화%적가우%류설봉
瑞雷波%有限元%频散曲线%之字型
瑞雷波%有限元%頻散麯線%之字型
서뢰파%유한원%빈산곡선%지자형
Rayleigh wave%Finite element%Dispersion curve%Zigzag
虽然MASW技术已经广泛地应用于地基检测中,但由于缺少大量理论指导,特别是数值模拟方面的研究,其应用受到限制.本文基于有限元软件LS-DYNA,通过数值模拟研究了四种典型地层(递增型地层、含软弱下伏层地层、含软弱夹层地层和硬夹层地层)由MASW方法提取的瑞雷波频散曲线的"之"字型特征.发现对于递增型地层,频散曲线不会出现"之"字型,对于其他三种地层,频散曲线则会出现不同类型的"之"字型,其中含软弱夹层地层"之"字型的位置和尺寸与软夹层的位置和层厚有较好的对应关系.本文的研究结果为实际工程中利用瑞雷波频散曲线的形状判定地层类型和软弱央层位置提供了重要参考.
雖然MASW技術已經廣汎地應用于地基檢測中,但由于缺少大量理論指導,特彆是數值模擬方麵的研究,其應用受到限製.本文基于有限元軟件LS-DYNA,通過數值模擬研究瞭四種典型地層(遞增型地層、含軟弱下伏層地層、含軟弱夾層地層和硬夾層地層)由MASW方法提取的瑞雷波頻散麯線的"之"字型特徵.髮現對于遞增型地層,頻散麯線不會齣現"之"字型,對于其他三種地層,頻散麯線則會齣現不同類型的"之"字型,其中含軟弱夾層地層"之"字型的位置和呎吋與軟夾層的位置和層厚有較好的對應關繫.本文的研究結果為實際工程中利用瑞雷波頻散麯線的形狀判定地層類型和軟弱央層位置提供瞭重要參攷.
수연MASW기술이경엄범지응용우지기검측중,단유우결소대량이론지도,특별시수치모의방면적연구,기응용수도한제.본문기우유한원연건LS-DYNA,통과수치모의연구료사충전형지층(체증형지층、함연약하복층지층、함연약협층지층화경협층지층)유MASW방법제취적서뢰파빈산곡선적"지"자형특정.발현대우체증형지층,빈산곡선불회출현"지"자형,대우기타삼충지층,빈산곡선칙회출현불동류형적"지"자형,기중함연약협층지층"지"자형적위치화척촌여연협층적위치화층후유교호적대응관계.본문적연구결과위실제공정중이용서뢰파빈산곡선적형상판정지층류형화연약앙층위치제공료중요삼고.
MASW technology is widely used in stratum exploration, but its application is limited because of insufficient theoretical guidance, especially numerical simulation research. This article used the finite element software LS-DYNA to study the characteristics of Rayleigh wave zigzag dispersion curves (extracted by MASW method) of four typical strata (stratum of Rayleigh wave velocity increasing with wavelength, stratum with a soft under-layer,with a weak interlayer, and with a hard interlayer) by numerical simulation method.We found that the Rayleigh wave dispersion curve of the first stratum does not show zigzag,however, the Rayleigh wave dispersion curves of the other strata display different zigzag types.Among the four strata, the zigzag position and size of the stratum including a weak interlayer matches well with the position and layer thickness of the weak interlayer. The results of the article offer important reference for using dispersion curve shape to determine stratum types and position of weak interlayer in actual engineering.