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基于改进后的土体离散-连续耦合算法,对坂神地震中神户大开地铁车站的坍塌破坏过程进行了数值模拟.通过改进适用于Lagrange乘子法求解的优化模型,来强化离散和连续模型在耦合边界上力的相容性,并将改进后的算法嵌入离散-连续耦合动力模型.在耦合边界通过交换速度和力保证耦合模型的连续性,通过自振柱模拟和循环双轴模拟使离散区域土体的宏观动力属性与连续土体模型一致.土体离散-连续耦合方法可以从细观尺度描述重点考察区域土体和结构的破坏过程,并有效降低离散元的模拟规模.模拟得到的车站破坏形式与文献中现场情况非常接近,并从定量角度与文献中基于连续体的模拟结果进行了比较.
Based on the improved soil-discrete-continuum coupling algorithm, the collapse process of the Kobe subway station in the Sakashin Earthquake is numerically simulated and the discrete and continuous models are enhanced by improving the optimization model suitable for Lagrange multiplier method The compatibility of forces on the coupled boundary and the improved algorithm is embedded in the discrete-continuous coupled dynamic model, the continuity of the coupled model is guaranteed at the coupled boundary by the exchange speed and force, the discretization The macroscopic dynamical properties of the soil are consistent with those of the continuous soil model.Discrete-continuous coupling method of soil can describe the failure process of the soil and structure from the mesoscopic scale and effectively reduce the simulation scale of the discrete element.The simulated The form of station damage is very close to the field situation in the literature and is compared quantitatively with the continuum-based simulation results in the literature.