汶川震区桃关沟泥石流都汶高速段动力学特征数值模拟

中文摘要: 针对2013年“7·10”桃关沟泥石流对沟口段都汶高速等建筑造成的冲击淤埋问题，通过现场调查泥石流的形成条件和发育特征，采用雨洪法计算确定了泥石流的相关运动学参数，利用大型计算流体动力学软件CFX模拟再现“7·10”泥石流泛滥过程，得到泥石流通过研究区过程中流速、流量等动力学参数的变化情况及相应的危险区范围，分析泥石流速度场分布及其对沿沟建筑物的影响；重点研究了泥石流对都汶高速桥梁段桥墩的冲击力及危害性，模拟结果与规范公式计算得到的整体冲击力误差仅为5.8%。
Abstract:Aimed at the impact force of the debris flow occurred on July 10,2013,which buried the facilities including Duwen highway at the deposition fan of Taoguan gully,the formation condition and development characteristic of the debris flow through field investigation were identified,and relevant kinematics parameters were determined by using the rain flood method.Applying large scale fluid dynamics software CFX,the process of 10th July debris flow in Duwen highway segment and its motion feature were simulated.The motional dynamics and hazardous zone of the debris flow were obtained.The distribution of the velocity field and the influence on facilities localized along the debris flow gully were analyzed.Meanwhile,the impact force of the debris flow and the corresponding risk on the bridge pier of Duwen highway were intensively studied.The simulated results agreed well with the calculated ones by empirical formula with an error of only 5.8%.