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With recent advances in calculation methods, the external factors that affect slope stability, such as water content fluctuations and self-configuration, can be more easily assessed. In this study, a three-dimensional finite element strength reduction method was used to analyze the stability of three-dimensional slopes under fluctuating water conditions. Based on soil parameter variations in engineering practice, the calculation models were established using heterogeneous layers, including a cover layer with inferior properties. An analysis of seepage, deformation and slope stability was carried out with 27 different models, including three different slope gradients and nine different corner angles under five different hydraulic conditions. The failure mechanism has been shown to be closely related to the change in matric suction of unsaturated soils and the geometric slope configuration. Finally, the effect of geometry (surface shape, turning corner and slope gradient) and water (fluctuations) on slope stability are discussed in detail. Emphasis is given to comparing safety factors obtained considering or ignoring matric suction.
Yue Zhou; Shun-Chao Qi; Gang Fan; Ming-Liang Chen; Jia-Wen Zhou. Topographic Effects on Three-Dimensional Slope Stability for Fluctuating Water Conditions Using Numerical Analysis. Water 2020, 12, 615 .
AMA StyleYue Zhou, Shun-Chao Qi, Gang Fan, Ming-Liang Chen, Jia-Wen Zhou. Topographic Effects on Three-Dimensional Slope Stability for Fluctuating Water Conditions Using Numerical Analysis. Water. 2020; 12 (2):615.
Chicago/Turabian StyleYue Zhou; Shun-Chao Qi; Gang Fan; Ming-Liang Chen; Jia-Wen Zhou. 2020. "Topographic Effects on Three-Dimensional Slope Stability for Fluctuating Water Conditions Using Numerical Analysis." Water 12, no. 2: 615.
On 8 August 2017, a runoff-generated debris flow occurred in the Puge County, Sichuan Province of southwestern China and caused huge property damage and casualties (25 people died and 5 people were injured). Emergency field investigations found that paddy fields, dry land, residential buildings and roads suffered different degrees of impact from the debris flow. This paper reveals the formation process of the debris flow by analyzing the characteristics of rainfall precipitation and sediment supply conditions in the study area and it approaches the practical application of hazard prevention and mitigation constructions. Doppler weather radar analysis indicates that a very high intensity rainfall occurred in the middle and upper zones of the basin, illustrating the importance of enhancing rainfall monitoring in high-altitude areas. The abundant supply of deposits in gully channels is among the significant causes of a transformation from mountain floods to large-scale debris flows. It was also found that the two culverts played an important role in the movement affecting the processes of debris flows which has substantially aggravated the destructive outcome. The excessive supply of solid material and local blockage with outburst along a gully must receive significant attention for the prediction of future debris flows, hazard prevention and mitigation measures.
Ming-Liang Chen; Xing-Nian Liu; Xie-Kang Wang; Tao Zhao; Jia-Wen Zhou. Contribution of Excessive Supply of Solid Material to a Runoff-Generated Debris Flow during Its Routing Along a Gully and Its Impact on the Downstream Village with Blockage Effects. Water 2019, 11, 169 .
AMA StyleMing-Liang Chen, Xing-Nian Liu, Xie-Kang Wang, Tao Zhao, Jia-Wen Zhou. Contribution of Excessive Supply of Solid Material to a Runoff-Generated Debris Flow during Its Routing Along a Gully and Its Impact on the Downstream Village with Blockage Effects. Water. 2019; 11 (1):169.
Chicago/Turabian StyleMing-Liang Chen; Xing-Nian Liu; Xie-Kang Wang; Tao Zhao; Jia-Wen Zhou. 2019. "Contribution of Excessive Supply of Solid Material to a Runoff-Generated Debris Flow during Its Routing Along a Gully and Its Impact on the Downstream Village with Blockage Effects." Water 11, no. 1: 169.
Granular materials in geotechnical engineering is generally considered to be mixtures of clay, sand, and gravel that commonly appear in slopes, valleys, or river beds, and they are especially used for the construction of earth-rock-filled dams. The complexity of the constitution of granular materials leads to the complexity of their properties. Particle size distribution (PSD) has a great influence on the strength, permeability, and compaction behavior of granular materials, and some implicit correlation may exist between the PSD and the compaction properties of granular materials. Field testing and statistical analysis are used to study the physical and compaction properties of granular materials with artificial grading behind the particle size distributions. The statistical properties in PSD of dam granular materials and how the variation of PSD renders statistical constant are revealed. The statistical constants of three types of dam granular materials are 2.459, 2.475, and 2.499, respectively, on average. These statistical constants have a positive correlation with dry density and a negative correlation with moisture content. According to this characteristic and little deviation between two different calculation methods (from grading analysis and based on the Weibull distribution), the presentation of the statistical analysis ensures the validity of the Weibull function’s description of the granular materials with artificial grading. After fitting the Weibull function to the PSD curve, the relationship between the Weibull parameters and the compaction degree in different soil samples is consistent with that in different types, providing guiding significance for evaluating and selecting dam granular materials.
Ming-Liang Chen; Gao-Jian Wu; Bin-Rui Gan; Wan-Hong Jiang; Jia-Wen Zhou. Physical and Compaction Properties of Granular Materials with Artificial Grading behind the Particle Size Distributions. Advances in Materials Science and Engineering 2018, 2018, 1 -20.
AMA StyleMing-Liang Chen, Gao-Jian Wu, Bin-Rui Gan, Wan-Hong Jiang, Jia-Wen Zhou. Physical and Compaction Properties of Granular Materials with Artificial Grading behind the Particle Size Distributions. Advances in Materials Science and Engineering. 2018; 2018 ():1-20.
Chicago/Turabian StyleMing-Liang Chen; Gao-Jian Wu; Bin-Rui Gan; Wan-Hong Jiang; Jia-Wen Zhou. 2018. "Physical and Compaction Properties of Granular Materials with Artificial Grading behind the Particle Size Distributions." Advances in Materials Science and Engineering 2018, no. : 1-20.
With the rapid development of the economy in the southwest China, more and more large projects are built in such areas. However, how to fill and cut well has been frequent problem because the western region is mostly mountainous areas. Especially for filling, in order to protect the stability of constructions, mechanical properties of granular materials used to fill are quite important. Particle size distribution, fines content and characteristic particle size values are main factors that affects mechanical properties. Under different confining pressure, the changes in fine particle content can lead to change granular materials’ mechanical properties. In this study, three sets of granular materials with different fine particle contents (PSD-1: 20%, PSD-2: 30%, PSD-3: 40%) and three samples (fine particle content of 20%) with different characteristic particle size values are considered. Simulation results indicate that the mechanical properties of granular materials are better when fines content is 40% under low confining pressure. However, when confining pressure is more than 400 kPa, mechanical property of granular materials with fines content of 20% is better.
Bin-Rui Gan; Xing Han; Xing-Guo Yang; Ming-Liang Chen; Jia-Wen Zhou. Optimal Values of Fines Particle Content on the Mechanical Properties of Granular Material. Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours 2018, 346 -353.
AMA StyleBin-Rui Gan, Xing Han, Xing-Guo Yang, Ming-Liang Chen, Jia-Wen Zhou. Optimal Values of Fines Particle Content on the Mechanical Properties of Granular Material. Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours. 2018; ():346-353.
Chicago/Turabian StyleBin-Rui Gan; Xing Han; Xing-Guo Yang; Ming-Liang Chen; Jia-Wen Zhou. 2018. "Optimal Values of Fines Particle Content on the Mechanical Properties of Granular Material." Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours , no. : 346-353.
This paper presents a preliminary study of time evolution and spatial accumulation of progressive failure for ancient landslide deposits in Xinhua slope. According to the geological response after impoundment, the Xinhua slope has shown the spatial accumulation of deformation, such as ground cracks in the rear edge, toe collapse, local shallow slides in intense rainfall, and progressive creep displacement. Approximately 2 years of monitoring was performed for the Xinhua slope with the assistance of the global navigation satellite system (GNSS), unmanned aerial vehicles (UAVs), and field investigations. The deformation process of a reservoir landslide is considered to be a comprehensive and complicated combination of geological influence from various adverse factors. Field investigations and monitoring indicate that the major serious influence after completion of dam construction comes from the initial large-scale impoundment, the fluctuation of water level, and the existence of a flood season. The creep/slip deformation of slope deposits is a result of integration with adverse hydraulic conditions, e.g., strong rainfall, intense currents and transient seepage flow inside the slope deposits, and activation by water level fluctuation, which can be verified from the twofold evident deformation in the flood season. For the reservoir with daily regulation ability, the occurrence of evident deformations in July highlights that the regulation plan for water level in the flood season is important for controlling the deformation of slope deposits, where the fluctuation of the water level is no more than 10 m in the operation period.
Ming-Liang Chen; Peng-Fei Lv; Shi-Lin Zhang; Xing-Ze Chen; Jia-Wen Zhou. Time evolution and spatial accumulation of progressive failure for Xinhua slope in the Dagangshan reservoir, Southwest China. Landslides 2018, 15, 565 -580.
AMA StyleMing-Liang Chen, Peng-Fei Lv, Shi-Lin Zhang, Xing-Ze Chen, Jia-Wen Zhou. Time evolution and spatial accumulation of progressive failure for Xinhua slope in the Dagangshan reservoir, Southwest China. Landslides. 2018; 15 (3):565-580.
Chicago/Turabian StyleMing-Liang Chen; Peng-Fei Lv; Shi-Lin Zhang; Xing-Ze Chen; Jia-Wen Zhou. 2018. "Time evolution and spatial accumulation of progressive failure for Xinhua slope in the Dagangshan reservoir, Southwest China." Landslides 15, no. 3: 565-580.