摘要
结合龙滩水电站左岸边坡区工程地质条件以及实测地应力资料,分析了研究区域初始地应力的影响因素。在各影响因素单独作用下,采用FLAC3D计算程序对建立的左岸高边坡三维地质概化模型进行计算;在实测点地应力值与计算得到的应力值之间建立多元回归模型,通过多元回归分析,求出最优回归系数。通过实测点的计算应力值与现场实测值的比较,两者在量值上相当且方向上接近,表明经过回归得到的地应力场是合理的,从而获得左岸高边坡区初始地应力场较为合理的分布规律,为左岸高边坡开挖模拟及长期稳定性分析提供了合理的三维初始地应力场。
Based on the measured data of geostress and engineering-geological conditions in the region of the left bank high slope at Longtan hydropower station, possible factors affecting the initial geostress field are discussed. Under individual effect of factors, the established 3D simplified geological model of the left bank high slope is calculated by FLAC^3D. Then, a multivariate regression model is established between the actually measured and corresponding calculated results of geostresses. Through multiple regression analysis, the optimum regression coefficient can be derived. Through the comparison between computed and measured geostress values of measuring points, it has been found that the two are similar in values and directions, which suggests the accuracy and reasonability of the geostress field regression. Thereby, the distribution tendency of initial geostress field of left bank high slope region can be obtained, providing a rational 3D initial geostress field for excavating simulation and analysis of lonz-term stability of the left bank high slope at Longtan hydropower station.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第22期4055-4064,共10页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)项目(2002CB412708)
国家杰出青年科学基金资助项目(50325414)
关键词
水利工程
龙滩水电站
高边坡
初始地应力场
hydraulic engineering
Longtan hydropower station
high slope
initial geostress field
