Research on Mechanical Parameters and Process Simulation of Debris Flows in the Areas Affected By the 2008 Wenchuan Earthquake
文献类型：学位论文
| 作者 | HAMID FAIZ |
| 答辩日期 | 2020 |
| 授予单位 | 中国科学院大学 |
| 授予地点 | 北京 |
| 导师 | 葛永刚 |
| 关键词 | 龙池地区 泥石流流变学 FLO-2D模型 Mass-Flow模型 灾害评估 |
| 学位名称 | 硕士 |
| 学位专业 | 岩土工程 |
| 其他题名 | 2008年汶川地震灾区泥石流力学特征调查与过程模拟研究 |
| 英文摘要 | Debris flow is a devastating natural phenomenon in mountainous areas, which causes human losses and damage to infrastructures. The main triggering factors of debris flow are rainfall and earthquake. On 12 to 14 August 2010, heavy rainstorms occurred in the Sichuan province of South-West China which were affected by the 2008 Wenchuan Earthquake, induced a series of catastrophic debris flows, resulted in considerable loss of lives and infrastructure. Therefore, it is appropriate to investigate the actual mechanism and dynamic run-out characteristics of debris flow in detail and develop the guidelines for numerical simulations, particularly in the mountainous area like Wenchuan. The main objective of this research is to evaluate the rheological behavior of debris flow by experiments while assessment of debris flow run out and its entertainment behavior using FLO-2D and Mass-Flow models. The main characteristics and development status of debris flows in the Longchi basin have been investigated by fieldwork. Soil samples from the riverbed and sources area were collected for extensive laboratory testing. A series of laboratory testing, which includes soil indices test and rheological parameters of debris flow containing granular materials with size finer than 0.075mm have been obtained using a rotational rheometer (Physica MCR). The rheological behavior has been examined at different ranges of volumetric concentration. These results showed the values of shear stress and viscosity have been increasing exponentially with the increase of solid volumetric concentration. In FLO-2D, analysis of debris flow mobility was carried out using Bingham rheological model while Mass-Flow follows the guidelines of the Coulomb and Voellmy rheological model. In this research, these programs have been compared according to their fundamental theories, input-output data, computational algorithms, and results by simulating debris flow in the study area. The simulation results of FLO-2D and Mass-Flow were compared based on their observed data. The results of this study obtained through the FLO-2D and Mass-Flow model also showed that the average depth and volume of debris flow deposit is relatively smaller than the actual range of debris flow. The sensitivity analysis of input parameters were carried out in the FLO-2D model. The model is found to be highly sensitive to solid volumetric concentration Cv and rheological parameters (yield stress and viscosity). Root Mean Square Error (RMSE) were conducted to verify the accuracy and performance of models. The RMSE for FLO-2D and Mass-Flow model were 4.389 and 4.094, respectively. The best performing model in simulating the debris flow was selected based on the lowest RMSE values. Finally, the hazard map of debris flow was developed, and the resulting hazard map revealed that the high-hazard area is relatively large. In contrast, the medium and the low-hazard regions are relatively small in the debris flow gully selected from the Longxi river basin. Furthermore, the hazard map can supply a reference for debris flow control, land use planning, and disaster mitigation design in the future. Based on the "8.13" debris flow characteristics in the Longchi area, these models can be used in the future to predict the accumulation range and run out features of other debris flows at home and abroad. |
| 语种 | 英语 |
| 页码 | 136 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/54999]  |
| 专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
| 作者单位 | 中国科学院成都山地灾害与环境研究所 |
| 推荐引用方式 GB/T 7714 | HAMID FAIZ. Research on Mechanical Parameters and Process Simulation of Debris Flows in the Areas Affected By the 2008 Wenchuan Earthquake[D]. 北京. 中国科学院大学. 2020. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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