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针对糯扎渡水电站调压井工程区的特点,建立三维仿真模型,根据实测位移分析、BP神经网络和最小残差原理,反演出工程区各岩层弹性模量,并将反演参数导入模型进行三维弹塑性反馈计算.实测位移分析表明,调压井拱顶位移随着开挖方量的增大而增大,最大位移发生在1号调压井与连通上室连接处,最大值1.68 mm;反演得到的各岩层弹性模量分别为:微新层24.11 GPa,弱风化上层10.13GPa,弱风化下层3.16GPa,强风化层0.20GPa,断层0.62GPa,最小位移残差为16.82 mm2;监测和计算的位移、位移增量变化趋势基本一致,说明反演参数可靠;因实际开挖瞬间卸荷,计算位移比监测位移一般要大,最大计算位移为3.22mm;洞室开挖后围岩变形主要朝临空面方向,围岩变形较小,围岩较稳定.
According to the characteristics of the surge zone in Nuozhadu Hydropower Station, a three-dimensional simulation model is established. According to the measured displacement analysis, BP neural network and the principle of least residual, the elastic modulus of each formation in the engineering area is inverted and the inversion parameters are imported into the model Three-dimensional elastic-plastic feedback calculation. The measured displacement analysis shows that the displacement of vault of surge shaft increases with the increase of excavation volume, and the maximum displacement occurs at the junction of No.1 surge tank and connecting upper chamber with a maximum value of 1.68 mm. The elastic modulus of each rock formation obtained by inversion is respectively 24.11 GPa at the micro-new layer, 10.13 GPa at the weakly weathered layer, 3.16 GPa at the weakly weathered layer, 0.20 GPa at the strong weathered layer and 0.62 GPa at the fault with a minimum displacement residual of 16.82 mm2. Monitoring and Calculated displacement and displacement incremental trends are basically the same, indicating that the inversion parameters are reliable; due to the actual excavation moment unloading, the displacement is generally larger than the monitoring displacement, the maximum calculated displacement of 3.22mm; rock excavation deformation The main direction towards the empty surface, smaller deformation of surrounding rock, rock is more stable.