田湾核电厂人工高边坡的三维数值模拟

3D NUMERICAL SIMULATION OF THE HIGH CUT SLOPE OF TIANWAN NUCLEAR POWER PLANT

在对岩体工程进行数值模拟分析时,岩体力学参数的确定是影响分析结果可靠性的关键步骤。由于岩体受结构面的控制,其变形和强度性质由岩块和结构面的性质共同决定。将岩块视为各向同性介质,其参数可由室内试验测得;将岩体中的结构面视为一种初始损伤,岩体变形参数通过岩块参数的损伤折减来确定。同时,利用Hoek-Brown岩体强度参数预测方程,结合RMR分类,通过弱化处理确定岩体的强度参数。将折减后的岩体变形参数和弱化处理后的强度参数用于田湾核电厂人工高边坡的三维数值模拟,对几种开挖方案进行分析对比,为最终设计提供了合理的挖坡角。

The mechanical parameters of rock masses are controlled by rock and structural planes,the determination of which is one key issue in numerical simulation of rock engineering.In the case of the high cut slope of Tianwan Nuclear Power Plant,mechanical parameters of rock are obtained by laboratory tests,and parameters of structural planes by field investigations.Considering the structural planes as initial damage,damage mechanics is applied to analyze the deformation parameters of rock masses by discounting mechanical parameters of rock.Meanwhile,RMR classification and the Hoek-Brown criterion are employed to estimate the strength parameters of rock masses.Three excavation schemes of the high cut slope are simulated by this methodology with the data of field and laboratory investigations,and a reasonable scheme is proposed consequently.