波速测试技术在场地抗震评价中的应用研究
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摘要
波速测试技术是地震勘探方法之一,也是一种简便、快速、准确的原位测试技术。它通过获取的地震波在经过不同深度的岩、土层的直达波旅行时,求得纵波、剪切波波速,进而通过弹性波理论,计算出岩、土层动弹性力学参数,同时也可以根据剪切波的波速,来划分场地土类型和建筑场地类别,以及计算卓越周期,这些参数可以为场地抗震设计及地震安全性评价提供依据。这里简述了波速测试技术的工作原理和野外实测技术,以及数据处理和资料解释全过程,并且结合某一建筑场地的实例,说明了波速测试技术在场地抗震评价中的应用及其效果。
Wave-velocity test technique is one of seismic exploration methods.It is an easy,rapid and accurate method of in-site measurement.The velocities of P and Shearing-wave may be obtained by measuring the travel time of first break from seismic wave field propagated through rock and soil at different depths.Furthermore,some kinetic parameters of rock and soil may be figured out according to the velocities of P-wave and S-wave based on elastic theory,meanwhile,the site soil type and building site category can be divided and the predominant period can be calculated according to the velocities of shearing-wave.These parameter can supply the basis for site design of earthquake resistant and the evaluation of earthquake security.This paper briefly introduced the working principles,field observing techniques,data processing and analysis about Wave-velocity test technique.And we illustrated the application of Wave-velocity test technique and its effect in the evaluation of site earthquake resistant with some practical examples.
Wave-velocity test technique is one of seismic exploration methods.It is an easy,rapid and accurate method of in-site measurement.The velocities of P and Shearing-wave may be obtained by measuring the travel time of first break from seismic wave field propagated through rock and soil at different depths.Furthermore,some kinetic parameters of rock and soil may be figured out according to the velocities of P-wave and S-wave based on elastic theory,meanwhile,the site soil type and building site category can be divided and the predominant period can be calculated according to the velocities of shearing-wave.These parameter can supply the basis for site design of earthquake resistant and the evaluation of earthquake security.This paper briefly introduced the working principles,field observing techniques,data processing and analysis about Wave-velocity test technique.And we illustrated the application of Wave-velocity test technique and its effect in the evaluation of site earthquake resistant with some practical examples.
引文
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[2]龚湘湖.剪切波速测试及其在地震安全性评价工作中的应用[J].岩土工程界,2000,3(10);52.
[3]周竹生,蒋晶晶,徐建明.PS测井在公路隧道勘察中的应用[J].工程地球物理学报,2004,1(5),395.
[4]建设部.GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[5]工程地质手册编写委员会.工程地质手册[Z].北京:中国建筑工业出版杜,2006.
[6]郑柱坚.场地卓越周期的测定及其在建筑抗震设计中的应用[J].工程抗震,2000,5(12):36.
[7]童广才,刘康和.场地卓越周期的确定[J].电力勘测,2000,2(43):43.
[8]王锺琦,张荣祥,汪敏,等.地震区工程选址手册[Z].北京:中国建筑工业出版,1994.
[9]张华,肖卫国,龚育龄,等.PS测井在地基勘察中的应用[J].工程勘察,2009,37(7):76.
[10]陶莅宁,侯广春.波速测试技术在工程地质勘察中的应用[J].山东煤炭科技,2008,10(2):112.
[11]袁志亮,吴治平.声波测井岩石波速统计分析[J].物探化探计算技术,2007,29(增刊):144.
[11]姜若愚,杨弘.昆明地区建筑工程抗震设计场地土条件划分方法的研究与评价[J].物探化探计算技术,2001,23(4):328.
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