Yii-Wen Pan | National Chiao Tung University (original) (raw)

Papers by Yii-Wen Pan

Journal of the Chinese Institute of Civil and Hydraulic Engineering, Nov 1, 2019

Landslides induced by heavy rainfall or earthquake sometimes result in the blockage of river flow... more Landslides induced by heavy rainfall or earthquake sometimes result in the blockage of river flow to form barrier lakes. Relevant data are important for understanding the formation and stability of landslide dams; the inventory of the fundamental landslide-dam data is hence essential. According to the statistics of recorded cases, landslide dams often breach in a short time. As a consequence, it is often difficult to collect comprehensive information of a landslide dam with a short life after dam breach. It is, however, possible for case reconstruction of a breached landslide dam through various methods. This study made use of the particle-flow simulation code PFC to model the processes of the formation and evolution of landslide dams induced by heavy rainfall. In the past, the common approach to trigger a landslide’s initialization by the particle-flow simulation is to substantially reduce the inter-particle frictional coefficient. However, this approach may lead to incorrect inter...

Deformation Characteristics of Geomaterials / Comportement Des Sols Et Des Roches Tendres, 2003

Scour and Erosion, 2016

One reach that locates in the midstream of the Touqian River in northern Taiwan was subjected to ... more One reach that locates in the midstream of the Touqian River in northern Taiwan was subjected to various human disturbances; the channel morphology in the reach changed severely as a result. This case study looks into the role of human disturbance on channel evolution by exploring the chronological change in channel morphology due to human influences in the studied reach. The major human influences in this reach include gravel mining, bridge construction and its protection works, and weir construction. Channel morphology downstream the bridge was transformed from an alluvial channel to a bedrock channel since the installation of a massive protection work. Later on, the bridge and its protection work were broken in recent years. After their failure, the reach started to take re-deposition and has returned to an alluvial channel. Chronological data including aerial photographs, cross-section surveys and hydrological data were compiled and analyzed. Also, field geology was conducted to characterize the distribution of bedrock outcrop and the erosion processes in the studied reach. According to the study results, the maximum depth of bedrock incision exceeds 15 meters. Main influences can be attributed to various human activities and the low resistance of young sedimentary rocks to erosion. The case study, as a fine example, demonstrates the processes of channelmorphology change due to human disturbances.

EGU General Assembly Conference Abstracts, Apr 1, 2016

The scour on hydraulic structures could be reducing its stability due to the caused foundations d... more The scour on hydraulic structures could be reducing its stability due to the caused foundations damage. Therefore, determining the local scour holes downstream of hydraulic structures plays an important role in their planning and design stages. This study aims to propose an approach for estimating the shape and the depth of the scour hole on weak rocks. In this study, several dam sites information were collected and compared with approach method. The results were compared with field data; the compared results show that presented methods were appropriate to freefall condition but underestimation with the locations and the shape of the ski-jump condition. Alternatively, the approach method has obvious improvement compared with evaluate current methods.

ABSTRACT: This paper aims to investigate the load bearing behavior and failure mechanism of a sha... more ABSTRACT: This paper aims to investigate the load bearing behavior and failure mechanism of a shallow foundation on poorly cemented rock. A series of laboratory material and model tests with specimens made of artificial soft rock were conducted. The results of material tests show that the properties of the artificial material are quite close to natural poorly cemented sandstone. The results of model bearing test indicate that a load-settlement curve can be roughly divided into the incipient stage, the linear stage, the yielding stage, and the final stage. The failure zones and mechanism were also identified. Failure zones were divided into the active zone, the transitional zone, and the passive zone. It was found that the bearing behavior on poorly cemented sandstone is distinct from the cases on hard rock or soil, with both plasticity and brittle characteristics. The bearing capacity formulas commonly used for soil or hard rock is not necessarily suitable for the case of poorly cemented soft sandstone.

1Research Engineer, Natural Hazard Mitigation Research Center, National Chiao-Tung University, Hs... more 1Research Engineer, Natural Hazard Mitigation Research Center, National Chiao-Tung University, Hsinchu, Taiwan (1001 Ta Hsueh Road, Hsinchu, Taiwan 300) E-mail: mingwan@mail.nctu.edu.tw 2Engineer, Water Resources Planning Institute, Water Resources Agency, Ministry of Economic Affairs, Taichung, Taiwan (1340 Jhong Jheng Road, Wufong Township, Taichung County, Taiwan 413) E-mail: chengms@wrap.gov.tw 3Professor, Department of Civil Engineering and Natural Hazard Mitigation Research Center, National Chiao-Tung University, Hsinchu, Taiwan (1001 Ta Hsueh Road, Hsinchu, Taiwan 300) E-mail: jjliao@mail.nctu.edu.tw; ywpan@mail.nctu.edu.tw