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Zhang S.,Hong Kong University of Science and Technology | Zhang L.M.,Hong Kong University of Science and Technology | Xiang B.,Chinese Research Institute of Highway | Yuan Q.,Sichuan Xingshu Highway Construction Development Co.
Geotechnical Special Publication | Year: 2013

Over 30,000 landslides occurred during the Wenchuan earthquake on 12 May 2008 in China. The casualty caused by these earthquake-induced landslides was approximately one quarter of the total casualty of this earthquake. The travel distance is a key parameter that measures the vulnerability to landslides. An appropriate model is required to evaluate the possible travel distances of earthquake-induced landslides so that planners can better select safe sites in earthquake-prone areas in the future. This paper describes a study on the travel distances of earthquake-induced landslides. We focus on 160 landslide cases in which relevant geometric data is available. Considering the substantial variations of the lithology and topographic conditions, multi-variable regression models are established for rock slides and soil slides separately. A comparison between the travel distances of rain-induced landslides and the landslides triggered by the Wenchuan earthquake is also conducted. © 2013 American Society of Civil Engineers. Source


Chen H.X.,Tongji University | Chen H.X.,Hong Kong University of Science and Technology | Zhang L.M.,Hong Kong University of Science and Technology | Gao L.,Hong Kong University of Science and Technology | And 4 more authors.
Landslides | Year: 2016

Adjacent debris flows may interact in many ways: two or more concurrent debris flows may merge; one debris flow can run out over an existing debris flow fan. Such interactions may cause debris flow properties to change in the mixing process as well as more severe adverse effects than those caused by a single debris flow. This paper aims to investigate the interactions among channelized debris flows originated from adjacent catchments. Both concurrent and successive debris flows are considered. If several debris flows originate from different locations concurrently and merge, the volumetric sediment concentration (i.e., the ratio of the volume of solid material to the total volume of debris flow), Cv, is a good index to capture the mixing process of these debris flows. The change in Cv reflects where mixing occurs and the mixing degree. The debris flow properties (e.g., yield stress and dynamic viscosity) evolve in the mixing process and can be captured by the change in Cv. The debris flow with a larger volume dominates the mixing process, and the properties of the mixed debris flow are more similar to those of the larger debris flow. The inundated areas and runout distances of successive debris flows are smaller than those of concurrent debris flows of the same total volume due to the smaller scales of the individual events and blockage by the earlier debris flows. However, the deposit depth in the interacting part of the debris flow fans of successive debris flows can be much larger than that of concurrent debris flows, leading to more destructive cascading hazards (e.g., the formation of debris barrier lakes). The sequence of successive debris flows not only significantly influences the runout characteristics of the debris flows but also substantially affects the cascading hazards. © 2016 Springer-Verlag Berlin Heidelberg Source


Zhang S.,Hong Kong University of Science and Technology | Zhang L.-M.,Hong Kong University of Science and Technology | Chen H.-X.,Hong Kong University of Science and Technology | Yuan Q.,Sichuan Xingshu Highway Construction Development Co. | Pan H.,Sichuan Xingshu Highway Construction Development Co.
Journal of Mountain Science | Year: 2013

A large number of debris flows occurred in the Wenchuan earthquake zone after the 12 May 2008 earthquake. The risks posed by these debris flows were rather high. An appropriate model is required to predict the possible runout distance and impacted area. This paper describes a study on the runout characteristics of the debris flows that occurred in the Wenchuan earthquake zone over the past four years. A total of 120 debris flows are analyzed. Separate multivariate regression models are established for the runout distances of hill-slope debris flows and channelized debris flows. The control variables include type of debris flow, debris flow volume, and elevation difference. Comparison of the debris flows occurring before and after the earthquake shows that the runout distance increased after the earthquake due to sufficient material supply and increased mobility of the source materials. In addition, the runout distances of annual debris flow events in 2008, 2010 and 2011 are analyzed and compared. There is a tendency that the runout distance decreases over time due to the decreasing source material volume and possible changes of debris flow type. Comparison between the debris flows in the earthquake zone and the debris flows in Swiss Alps, Canada, Austria, and Japan shows that the former have a smaller mobility. © 2013 Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg. Source


Yuan Q.,Sichuan Xingshu Highway Construction Development Co. | Yang J.,Sichuan Xingshu Highway Construction Development Co. | Pan S.,Sichuan Xingshu Highway Construction Development Co.
Modern Tunnelling Technology | Year: 2013

Construction management in tunnel engineering is a complicated system. In particular, the complexity, uncertainty, and difficulty of system management are escalated when an extra-long tunnel is constructed in a high, cold mountain area. Using the typical extra-long single-tube two-way Balangshan Tunnel on the S303 highway in a high-altitude and very cold mountain area as an example, some new explorations and trials were conducted regarding tunnel construction management with respect to safety, quality, logistics, and scientific research as well as technological breakthrough. The concept of construction that is "people oriented, technologically innovative, and in harmony with nature" is put forward. A preliminary standard management system suitable for tunnel construction in cold mountain areas is conceived. Source

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