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以北盘江一级水电站地下厂房群为例,依据工程区区域地质条件与水文地质条件并结合实际开挖方式与开挖顺序,成功地在ADINA中实现了三维仿真数值模型的建立。采用应力试算法对模型边界处初始地应力进行拟合,在分析区域构造特征、现场实测数据和前期研究成果的基础上,通过对重力场模型的竖向边界上同时施加水平方向对称梯度应力,所取得的拟合效果最佳。洞室开挖完成后,洞周块体的水平位移均指向下游;围岩位移收敛速度较快,时效特征不显著。由于顶部局部软弱带的影响,致使该区洞室围岩变形稍大,但洞室整体稳定状况良好。最后,将位移现场监控数据与模拟结果进行了对比分析,结果说明所建模型可靠度高,可为洞室设计提供科学依据与技术指导。
Taking the underground powerhouse of Beipingjiang Hydropower Station as an example, according to the regional geological conditions and hydrogeological conditions in the project area, combining with the actual excavation method and excavation sequence, the successful establishment of 3D numerical simulation model in ADINA has been accomplished. Based on the analysis of regional tectonic features, field measurements and previous research results, the horizontal stress gradient is applied to the vertical boundary of the gravity field model at the same time. The fitting result obtained is the best. After the excavation of the cavern, the horizontal displacement of the block around the hole points downstream; the displacement of the surrounding rock is faster and the characteristics of aging are not significant. Due to the influence of the top local soft zone, the surrounding rock deformation of the cavern is slightly larger, but the overall stability of the cavern is good. Finally, the displacement field monitoring data were compared with the simulation results. The results show that the model has high reliability and can provide scientific basis and technical guidance for the design of the cavern.