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在研究和分析重大工程和高层建筑基础岩土结构的动力特性时,首先应测试及计算地基土的动态参数。如纵波速度(V_p),横波速度(V_s),动剪切模量(G_d),动弹性模量(E_d)和泊松比(v)等。近年来,应用跨孔地震波速测试方法可较精确地测定各地层的V_p及V_s,从而推测基础地层的沉积时代,确定地基土承载力,划分场地类别,计算饱和砂土液化势以及场地的地脉动卓越周期等。已经越来越得到许多工程技术人员的重视,并在一些土建工程的原位测试中得到应用。
In studying and analyzing the dynamic characteristics of the major engineering and high-rise building foundation geotechnical structures, the dynamic parameters of the foundation soil should be firstly tested and calculated. Such as longitudinal wave velocity (V_p), shear wave velocity (V_s), dynamic shear modulus (G_d), dynamic elastic modulus (E_d) and Poisson’s ratio (V). In recent years, the cross-hole seismic velocity method can be used to measure the V_p and V_s of various strata accurately, so as to infer the sedimentary age of base strata, determine the bearing capacity of foundation soil, classify the site, calculate the liquefaction potential of saturated sand and the ground Pulsating excellence cycle and so on. Has been getting more and more attention of many engineers and technicians, and in some civil engineering in situ testing has been applied.