摘要
根据实测地应力资料的三维有限元回归分析法是目前应用较多的初始地应力场数值分析方法之一。针对隧洞工程区特殊的地形条件(洞身很长),通过用梯形分布荷载代替常用的均布荷载来模拟水平向构造应力来提高回归的精度,对锦屏隧洞区地应力场进行回归拟合计算,复相关系数由0．919提高到0．976,表明该方法能显著提高回归精度,可广泛用于工程实践中。
3D FEM regression analysis based on the geostress data in situ measurement, one of the numerical analysis methods for initial geostress field, is widely used nowadays . Because of the special terrain condition （ the long axes） in the tunnel project region, the method to adopt trapeziform distribution load instead of the common uniform load is used to simulate the horizontal tectonic stress so as to improve the regression precision. In the geo-stress field regression fit calculation of Jinping tunnel, the multiple correlation coefficient increases from 0. 919 to 0. 976. It indicates that this method can improve the precision evidently, and so it can be widely used in the engineering practice.
出处
《红水河》
2006年第1期46-49,69,共5页
Hongshui River
关键词
初始地应力场
回归分析
三维有限元
隧洞工程区
initial geo-stress field
regression analysis
3D FEM
tunnel project region
