环北部湾广东水资源配置工程深埋隧洞段初始地应力场反演分析  

Regression Analysis of Initial Geostress Field for Deep-Buried Tunnel of Water Resources Allocation Project in Guangdong Province around the Beibu Gulf

作　　者：代志坤 郑晓 游思琴 DAI Zhikun;ZHENG Xiao;YOU Siqin(Zhongshui Zhujiang Planning,Survey and Design Co.,Ltd.,Guangzhou 510630,China)

机构地区：[1]中水珠江规划勘测设计有限公司,广东广州510630

出　　处：《人民珠江》2023年第4期19-28,共10页Pearl River

摘　　要：在深埋隧洞建设过程中,地应力是影响洞室围岩稳定性的重要因素,准确确定工程区初始地应力场可以有效地指导隧洞的设计及施工。为探究环北部湾广东水资源配置工程深埋隧洞的初始地应力分布情况,结合工程地质条件及实测地应力数据,采用有限差分软件FLAC 3D建立三维地质模型,在初始地应力场各影响因素的单独作用下进行分析计算,然后建立实测值与计算值之间的多元回归模型,通过多元回归分析,求出最优回归系数,从而获得地应力回归方程。比对回归值及实测值发现,二者量值大小及方向接近,说明通过回归分析建立的初始地应力场是合理的,可以为后续隧洞围岩稳定性评价、支护设计和长期安全的评价与预测提供有效的基础数据。Geostress has important influence on the surrounding rock of the deep-buried tunnel during its construction.Accurately identifying the initial geostress of the engineering area can effectively guide the design and construction of the tunnel.In order to study the distribution of initial geostress in the deeply buried tunnel area of water resources allocation project in Guangdong Province around the Beibu Gulf,a three-dimensional geological model was established via the finite difference software FLAC 3D,by reference to the geoengineering conditions and measured data on geostress,with the relevant analysis and calculation conducted under the separate effects of each factor concerning the initial geostress field.And the a multiple regression model between measured and calculated values was established to work out the optimal regression coefficient through multiple regression analysis,thus obtaining the regression equation of geostress.By comparing the regression values and the measured values,it is found that the magnitude and direction of the two values are close to each other,indicating that the initial geostress field established by regression analysis is reasonable and can provide effective basic data for subsequent evaluation of the stability of surrounding rock of the tunnel,support design and long-term safety evaluation and prediction.

关 键 词：深埋隧洞 初始地应力 多元回归分析 有限差分软件 

分 类 号：TV554[水利工程—水利水电工程]