喀什-乌恰交汇区VS30经验模型估计

本文通过收集喀什-乌恰地区20个钻孔深度大于30 m的钻孔实测数据,分别获得了5、10、15及20 m深度处的等效剪切波速VSZ与VS30的对数线性关系,根据对数线性和对数二次回归的方法,得到了VSZ与VS30的经验关系。结果显示:速度梯度模型外推方法获得的VS30经验模型,更加适合深度超过10 m的钻孔数据的估计。速度梯度模型外推方法中,对数二次回归和对数线性回归外推得到的VS30经验模型呈现相同的规律,拟合优度差别不大,利用速度梯度外推方法获得VS30经验模型,使用简单的线性模型就可以满足精度需求。

ESTIMATION OF VS30 EMPIRICAL MODEL IN KASHGAR-WUQIA INTERSECTION REGION

In this paper,the logarithmic linear relationship between the equivalent shear wave velocity(VSZ)and VS30 at the depth of 5,10,15 and 20 m in Kashgar-Wuqia area has been obtained by collecting the measured data of 20 boreholes with depth greater than 30 m,respectively,at 5 m,10 m,15 m,and 20 m,respectively.According to logarithmic linear and logarithmic quadratic regression,the empirical relationship between VSZ and VS30 is obtained.The results show that the VS30 empirical model obtained by the velocity gradient model extrapolation method is more suitable for the estimation of the VS30 value of the borehole with depth more than 10 m.In the extrapolation method of velocity gradient model,the VS30 empirical model obtained by quadratic regression calculation and linear regression extrapolation shows the same rule,and the goodness of fit is not much different.The VS30 empirical model is obtained by velocity gradient extrapolation method.A simple linear model can be used to meet the precision requirements.