原位跨孔试验方法

CROSSHOLE SEISMIC TESTING METHOD IN SITU

跨孔测试技术是研究岩土动力特性的一种重要的原位试验方法。本文根据多年来的现场实践,详细阐述了在进行原位跨孔试验时,必须认真考虑震源和三分量检波器的选择、钻孔的数量与孔距,钻孔排列方式、钻孔垂直度测量、三分量检波器与钻孔之间的耦合等因素,文章还介绍了压缩波和剪切的识别和速度误差分析方法。

The crosshole seismic testing is now generally recognized as onc of the few reliable method for obtaining information on seismic velocities, and hence dynamic moduli of in situ soils. In this paper, according to experience of field testing for many years, the authors described gen- cral procedures considered when performing the crosshole testing and evaluting the precision of P-wave velocities. These include the source, receiver, number of borings and their spacing and arrangement, test depth intervals, verticality measurement, the hole coupling with triaxialgeophone, P-wave and S-wave identification and velocity analysis techniques.