Three-dimensional,time-dependent modeling of rainfall-induced landslides over a digital landscape: a case study     

The Viet Tran  Massimiliano Alvioli  Giha Lee  Hyun Uk An 《Landslides》2018,15(6):1071-1084

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Susceptibility assessment of the precursor stage of a landslide threatening Haivan Railway Station,Vietnam     

Lam Huu Quang  Doan Huy Loi  Kyoji Sassa  Kaoru Takara  Hirotaka Ochiai  Khang Dang  Shinro Abe  Shiho Asano  Do Ngoc Ha 《Landslides》2018,15(2):309-325

Haivan Station is an important station on the North-South railway line in central Vietnam. Field investigation has identified a precursor stage of a landslide that would threaten this railway. Therefore, a landslide susceptibility assessment for Haivan Station was urgently needed to protect passenger safety and the national railway. Conducted investigations included air-photo interpretation, drilling, ground water and inclinometer monitoring, laboratory testing, and landslide simulation. This research applied the undrained dynamic loading ring shear apparatus ICL-2 to drill-core samples from the precursor landslide. Samples for ring shear tests were taken from sandy soil layers found at depths of ~21, ~31, and ~50 m in the cores. Each of these was believed to be a possible sliding surface of a landslide, and all were tested to shear failure in the ICL-2 apparatus. The boundary between highly weathered granitic rock and weathered granitic rock was identified at about 50 m depth. The inclinometer monitoring detected slight movement at this depth. Therefore, the present day risk of a landslide forming at 50 m is higher than for one forming at either 21 or 31 m. The landslide dynamic parameters obtained from the ring shear test of the 50-m-deep sample were used in an integrated numerical simulation model LS-RAPID. The simulation result gave the critical pore-pressure ratio for landslide occurrence, and landslide’s likely maximum speed, total volume, and depth of landslide debris that could cover the railway. These estimates serve to raise awareness of the vulnerability of the Vietnam national railway sector to landslide impact.  相似文献   

A discrete element study on the deformation and degradation of coal-fouled ballast     

Chen  Jing  Vinod  Jayan S.  Indraratna  Buddhima  Ngo  Ngoc Trung  Gao  Rui  Liu  Yangzepeng 《Acta Geotechnica》2022,17(9):3977-3993

Acta Geotechnica - This paper presents the results of Discrete Element Modelling (DEM) which quantitively examine the effect of coal fouling on the deformation and degradation of ballast upon...  相似文献   

The October 13, 2020, deadly rapid landslide triggered by heavy rainfall in Phong Dien,Thua Thien Hue,Vietnam     

Van Tien  Pham  Trinh  Phan Trong  Luong  Le Hong  Nhat  Le Minh  Duc  Dao Minh  Hieu  Tran Trung  Cuong  Tran Quoc  Nhan  Tran Thanh 《Landslides》2021,18(6):2329-2333

Landslides - At about 12:00 a.m., on October 13, 2020, a rapid rotational landslide induced by rainfall swept over Ranger Station-7 in Phong Xuan commune, Phong Dien district, Thua Thien Hue...  相似文献   

Investigation of ground rotational motions caused by direct and scattered P-waves from the 4 March 2008 TAIGER explosion experiment     

Nguyen Dinh Pham  Bor-Shouh Huang  Chin-Jen Lin  Tuan-Minh Vu  Ngoc-Anh Tran 《Journal of Seismology》2012,16(4):709-720

High-frequency rotational motions of P-waves and coda waves were analysed using rotation rate sensors and strong motion array data from the 4 March 2008 TAiwan Integrated GEodynamics Research (TAIGER) explosion experiment in northeastern Taiwan. Theoretical and observational investigations focussed on the effects of this experiment on the free surface. The main goal of this study was to explore possible applications of combined measurements of artificial explosion-derived translational and rotational motions. Also investigated was the consistent ground rotation observed directly by rotation rate sensors and derived using translational seismic arrays. Common near-source high-frequency rotational motion observations and array-recorded translational motions from one shallow borehole explosion are analysed in this study. Using a half-space assumption of plane P-wave propagation across the recording site, we conclude that: (1) rotational motions induced by direct P-waves interacting with a free surface in theory can be used to estimate wave radial direction, velocity and anisotropic properties; (2) rotational motions derived from scattering are predominant among the observed rotations during the TAIGER explosion experiments and allow us to image the heterogeneous structure of the medium at the investigated site; and (3) rotation sensor measurements undertaken during TAIGER explosion experiments may be affected by cross-axis sensitivities, which need to be considered when using the data obtained during these experiments.  相似文献   

Seismic retrofi tting of RC columns with RC jackets and wing walls with different structural details     

Shuenn-Yih Chang  Ting-Wei Chen  Ngoc-Cuong Tran  Wen-I Liao 《地震工程与工程振动(英文版)》2014,(2)

An original reinforced concrete(RC) column and four strengthened specimens, two with RC jackets and two with wing walls, were tested in this study. The original column specimen was designed to comply with older(pre-1999) design standards so that the usual detailing defi ciencies in existing school buildings in Taiwan could be simulated. Two different structural details were chosen to fabricate the full-scale specimens for each retrofi tting technique. The study confi rmed that either RC jacketing or the installation of wing walls with two different structural details can effectively improve the stiffness and strength of an existing column. RC jacketing shows a better improvement in energy dissipation and ductility when compared to the columns with wing walls installed. This is because the two RC jacketed columns experienced a fl exural failure, while a shear failure was found in the two columns with the wing walls installed, and thus led to a drastic decrease of the maximum lateral strengths and ductility. Since many factors may affect the installation of a post-installed anchor, it is better to use standard hooks to replace post-installed anchors in some specifi c points when using RC jacketing or installing wing walls.  相似文献   

Trace element concentrations in barramundi (Lates calcarifer) collected along the coast of Vietnam     

Nguyen Phuc Cam Tu  Nguyen Ngoc Ha  Shinsuke Haruta  Ichiro Takeuchi 《Marine pollution bulletin》2014

We determined concentrations of 23 trace elements (TEs), and stable carbon and nitrogen isotope (δ¹³C and δ¹⁵N) signatures in barramundi (Lates calcarifer) specimens collected along the coast of Vietnam in the Northern (NCZ), Central (CCZ) and Southern (SCZ) zones in the period 2007–2010. A combination of δ¹³C and δ¹⁵N signatures provided insight into ontogenetic shifts in barramundi foraging choices. There were clear zone-dependent differences in Mn, As, Sr and Tl concentrations; levels of Tl were highest in the NCZ, As in the CCZ, and Mn and Sr in the SCZ. Lowest concentrations of Rb occurred in the NCZ, Bi was lowest in the CCZ, and Cd and Cs were lowest in the SCZ. δ¹⁵N values significantly increased with increasing Zn, Se, Sn and Cs. Concentrations of TEs in barramundi from Vietnam were below worldwide guidelines for human consumption.  相似文献   

Impact of terrestrial runoff on organic matter,trophic state,and phytoplankton in a tropical,upland reservoir     

Duc Anh Trinh  Thi Nguyet Minh Luu  Quan Hong Trinh  Hai Sy Tran  Tien Minh Tran  Thi Phuong Quynh Le  Thuy Thi Duong  Didier Orange  Jean Louis Janeau  Thomas Pommier  Emma Rochelle-Newall 《Aquatic Sciences - Research Across Boundaries》2016,78(2):367-379

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Modelling the distribution of hard seabed using calibrated multibeam acoustic backscatter data in a tropical,macrotidal embayment: Darwin Harbour,Australia     

P. Justy W. Siwabessy  Maggie Tran  Kim Picard  Brendan P. Brooke  Zhi Huang  Neil Smit  David K. Williams  William A. Nicholas  Scott L. Nichol  Ian Atkinson 《Marine Geophysical Researches》2018,39(1-2):249-269

Spatial information on the distribution of seabed substrate types in high use coastal areas is essential to support their effective management and environmental monitoring. For Darwin Harbour, a rapidly developing port in northern Australia, the distribution of hard substrate is poorly documented but known to influence the location and composition of important benthic biological communities (corals, sponges). In this study, we use angular backscatter response curves to model the distribution of hard seabed in the subtidal areas of Darwin Harbour. The angular backscatter response curve data were extracted from multibeam sonar data and analysed against backscatter intensity for sites observed from seabed video to be representative of “hard” seabed. Data from these sites were consolidated into an “average curve”, which became a reference curve that was in turn compared to all other angular backscatter response curves using the Kolmogorov–Smirnov goodness-of-fit. The output was used to generate interpolated spatial predictions of the probability of hard seabed (p-hard) and derived hard seabed parameters for the mapped area of Darwin Harbour. The results agree well with the ground truth data with an overall classification accuracy of 75% and an area under curve measure of 0.79, and with modelled bed shear stress for the Harbour. Limitations of this technique are discussed with attention to discrepancies between the video and acoustic results, such as in areas where sediment forms a veneer over hard substrate.  相似文献   

Novel Soft Computing Model for Predicting Blast-Induced Ground Vibration in Open-Pit Mines Based on Particle Swarm Optimization and XGBoost     

Zhang  Xiliang  Nguyen  Hoang  Bui  Xuan-Nam  Tran  Quang-Hieu  Nguyen  Dinh-An  Bui  Dieu Tien  Moayedi  Hossein 《Natural Resources Research》2020,29(2):711-721

Natural Resources Research - Blasting is a useful technique for rocks fragmentation in open-pit mines, underground mines, as well as for civil engineering work. However, the negative impacts of...  相似文献