PS测井在地基勘察中的应用
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摘要
PS测井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,它通过获取地震波经过不同深度的岩土层的直达波旅行时便可求得纵、横波波速,进而通过弹性波理论基础计算出泊松比、剪切模量及弹性模量、体积模量及岩体完整性系数等岩土层动弹性力学参数。这些参数可以划分风化层位的界面,也可对围岩等级做出评定,为工程设计提供依据。本文简述了PS测井技术的工作原理、野外实测技术以及数据处理和资料解释全过程,并且结合某一场地的工程实例说明了PS测井技术在岩土工程勘察设计中的应用情况及应用效果。
PS-wave logging technique is one of the seismic exploration methods.It is an easy,rapid and accurate method for in-situ measurement.The velocities of P wave and S wave could be obtained by measuring the travel time of the first break from seismic wave field through rock and soil at different depths.Some kinetic parameters of rock and soil such as(Poisson's) ratio,shear modulus,elastic modulus,bulk modulus and integrity factor of rock mass could be calculated based on the velocities and elastic wave theory.All these parameters could take very important roles in the division of the weathering interface and the evaluation of the surrounding rock grade which provide the necessary warranties for engineering design.The working principles,field observing techniques,data processing and analysis on P and S wave logging technique are briefly introduced,and the application of the method and its effects on geotechnical engineering investigation and design are illuminated with some practical examples.
PS-wave logging technique is one of the seismic exploration methods.It is an easy,rapid and accurate method for in-situ measurement.The velocities of P wave and S wave could be obtained by measuring the travel time of the first break from seismic wave field through rock and soil at different depths.Some kinetic parameters of rock and soil such as(Poisson's) ratio,shear modulus,elastic modulus,bulk modulus and integrity factor of rock mass could be calculated based on the velocities and elastic wave theory.All these parameters could take very important roles in the division of the weathering interface and the evaluation of the surrounding rock grade which provide the necessary warranties for engineering design.The working principles,field observing techniques,data processing and analysis on P and S wave logging technique are briefly introduced,and the application of the method and its effects on geotechnical engineering investigation and design are illuminated with some practical examples.
引文
[1]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,2004,5(1):395~398.
[2]刘康和.PS测井技术的工程应用[J],华北地震科学,2001,19(1):18~22.
[3]王振东.浅层地震勘探应用技术[M].北京:地质出版社,1988,168~185.
[4]熊章强,方根显.浅层地震勘探[M].北京:地质出版社,2002,125~127.
[5]王俊茹.工程与环境地震勘探技术[M],北京:地质出版社,2002,1~25.
[6]谢昭晖.波速测试在北京市政工程勘察中的应用[J].公路工程,2002,(1):23~25.
[2]刘康和.PS测井技术的工程应用[J],华北地震科学,2001,19(1):18~22.
[3]王振东.浅层地震勘探应用技术[M].北京:地质出版社,1988,168~185.
[4]熊章强,方根显.浅层地震勘探[M].北京:地质出版社,2002,125~127.
[5]王俊茹.工程与环境地震勘探技术[M],北京:地质出版社,2002,1~25.
[6]谢昭晖.波速测试在北京市政工程勘察中的应用[J].公路工程,2002,(1):23~25.
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