Practical application of the coupled DDA-SPH method in dynamic modeling for the formation of landslide dam
Practical application of the coupled DDA-SPH method in dynamic modeling for the formation of landslide dam
复制标题
耦合DDA-SPH方法在滑坡坝形成动力模拟中的实际应用
DOI：
10.1007/s10346-019-01143-5
复制
发表时间：
2019
期刊：
影响因子：
6.7
通讯作者：
Zhou Jiawen
中科院分区：
文献类型：
--
作者：
Wang Wei;Yin Kunlong;Chen Guangqi;Chai Bo;Han Zheng;Zhou Jiawen
沿着滑坡可形成永久性或暂时性的滑坡坝和堰塞湖，威胁人民的生命财产安全。滑坡坝形成过程的调查是应急响应和减灾规划的关键。然而，实际情况下的地层过程建模通常涉及大规模和复杂的几何形状。为了克服计算复杂度和提高效率，提出了一系列实用的技术。首先，开发了一个明渠定常流模型（OCMSF）来自然地模拟河流水流。然后，提出了一种三阶段仿真策略，以实现大规模的实际建模。具体而言，第一阶段使用SPH方法产生了稳定的明渠流。在第二阶段，DDA方法被用来模拟滑坡运动，直到质量到达河流。在第三阶段，滑坡-河流相互作用的形成过程中实现了耦合DDA-SPH方法。以杨家沟滑坡坝的形成过程为例进行了实际应用。模拟结果表明，杨家沟滑坡在8 s左右以22 m/s的前缘速度到达河流，形成了一个体积约50万m3的大坝，这与现场调查结果相一致。从而证明了耦合方法和数值技术在模拟实际滑坡坝案例中的适用性和性能。
Landslides along river margins can cause permanent or temporal landslide dams and dammed-lakes, threatening people’s life and properties. Investigation of the formation process for the landslide dam is crucial for emergency response and mitigation planning. However, the formation process modeling for a practical case usually involves large scale and complicates geometry. To overcome the computation complexity and promote efficiency, a series of practical techniques have been proposed. Firstly, an Open Channel Model with Steady Flow (OCMSF) has been developed to naturally produce a river flow. Then, a three-stage simulation strategy has been proposed to fulfill the large-scale practical modeling. In specific, stage 1 generated a steady open channel flow using SPH method. In stage 2, the DDA method is used to simulate landslide movement until the mass reaches the river. In stage 3, the formation process with landslide-river interaction is realized using a coupled DDA-SPH method. The formation process of the Yangjiagou landslide dam was selected as the practical application. Simulation results showed the Yangjiagou landslide reached the river with a front velocity of 22 m/s in around 8 s and formed a dam with estimated volume of 500,000 m3, which is consistent with the site investigation. It is thus demonstrated the applicability and performance of the coupled method and numerical techniques in modeling practical landslide dam case.