由微振动记录用剥层法研究浅层S波速度结构

根据江苏华电句容发电一期2×1000 MW发电机组场地情况,布设了三角形嵌套和同心圆台阵进行微振动观测,采用空间自相关法计算频散曲线,并用剥层法反演得到该工程场地浅部的S波速度结构。反演结果与钻孔探测结果吻合较好,表明用微振动台阵记录反演浅部地壳S波速度结构在工程上是可行的。该方法具有不需要人工源,对避开噪声要求不苛刻、成本低且精度可满足工程要求等优点,故有良好的应用前景。

Research on S-Wave Velocity Structure of Shallow Stratum with Stripping Method from Array Records of Microtremors

On the site conditions of the first period of 2×1000 MW electric generating set of China Hua-neng Electric Power at Jurong, Jiangsu province, we designed triangular and concentrically circular arrays for the observation of microtremors;the phase velocities of surface wave were determined by the spatial autocorrelation method (SPAC), and the S-wave velocity structure of shallow stratum was identified with the stripping method. The consistent result of the inversion with bore-hole shows that this method has fol-lowing advantages: no requirement of artificial sources, no avoidance of noise pollution, cheap cost of the exploration, and satisfactory precision for engineering; so it has prospective application.