Papers by Keyword: Stability Analysis

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Authors: Xiao Feng Xie, Yuan Liang Liu, Jia Yong Han, Liang Xing
Abstract: Due to the high steep rock slope stability analysis its complex geological conditions and other factors, its stability calculation has been a technical problems the field of slope engineering, in this paper, 3D finite element calculation software Midas GTS for side slope surface topography and slope internal faults, weak structural plane of complex three-dimensional geological modeling, it overcomes the complex slope geological modeling problem and simulates rainfall, earthquakes and other factors affecting the stability on the slope, calculated results more in line with reality, and the software calculates is in accordance with fact, it provides a useful reference for slope engineering.
Authors: Jun Jie Wang, Hui Ping Zhang, Tao Liu
Abstract: A new method to analyze the seismic stability of the cut soil slope is suggested in this study. In the method, the limiting equilibrium theory and the stress analyzing method are used. The stress acceptability criterion is based on the limited strength of soil. Two basic assumptions are given in the method. One is that the slip surface can be replaced by a series of straight lines. The other is that the interslice boundary is an inclined plane. Three balance equations for any slice, which are two for force equilibrium and one for moment equilibrium, are proposed. An iterative method, which solves the balance equations from the first slice to the last slice, is also suggested. In the new method, the slip surface is not predefined, but is obtained slice by slice going from downhill to uphill in terms of the force and moment balance equations of the slice.
Authors: Li Jun Hu, Li Yuan
Abstract: HLLC is a monotonous high resolution scheme, which can capture shock, contact discontinuity and rarefaction wave accurately. But when we use it to calculate the multidimensional problem, the phenomenon of shock instability will appear near the strong shock. Compared with the HLLC, the FORCE scheme can present a good stability near the strong shock, and the dissipation is lower than HLL. This paper analyzes the stability of HLLC and FORCE, and proposes a hybrid scheme which can not only present good stability but also retain the high resolution of HLLC.
Authors: Dian Ting Liu, Cheng He Liang, Xiao Xiong Chen
Abstract: For a class of double-loop networked control system with differential sampling periods is studied in this paper. Its mathematical model is set up based on time-delay theory, and its stability conditions are obtained based on Lyapunov-Krasovskii functional and free-weighting matrices approach. On this basis, the design method of the controller to stabilize this networked control system with state feedback is explained. Finally, an example of the inverted pendulum is presented to test the validity and effectiveness of the methods proposed in this paper.
Authors: Zhong Fu Wang, Min Zhou, Bao Shen Zhang
Abstract: Based on the analyses of the traditional rockfill groins of spur dikes,the PHC pipe pile groin is presented.The functions of the riverwall protection function, anti-erosion performance, and structure design of the groin were analyzed. By the three-dimensional finite element numerical modeling, when the scour depth of spur dike is 20m, the safty coefficient of spur dike is 1.21 and the maximum deformation is 1.3 centimeter. The studies are shown that the PHC pipe pile have high strength, stability and anti-erosion performance; The deign of double-row pile is applied to the head of spur dike where the displacement is maximum and improves stress boundary condition of the spur dike and improves the whole stability effectively.
Authors: Dong Won Jung, Ji Hyun Jeong, Seung Min Woo, Eun Sil Jang, Kee Jin Park, Jae Hwan Son
Abstract: Due to recent requirements for the systematization of cultivation in agriculture, many kinds of agricultural machines have been used. Vehicles with lifting utility are used to harvest and transfer crops and fruit. These vehicles have buckets that can be moved up and down to harvest crops and fruit in high places. These vehicles often have to operate on unpaved slopes. Therefore, the stability of the vehicle should be studied in the development stage. In this study, the overturn angles of the vehicle in three conditions have been calculated to determine stability. As a result, it could be concluded that these vehicle models are stable.
Authors: Ying Huang, Zu Lian Zhang, Ke Sheng Jin
Abstract: The stability of the soil slopes can be judged according to the critical moisture content and the actual moisture content when the soil slopes be in the limit equilibrium state. From the perspective of earth pressure, the critical moisture content is the moisture content when the soil slopes be in the active limit equilibrium state, at this time, the active earth pressure is 0. The critical moisture content can be determined and the stability of the slopes can be judged according to the relationship of the soil parameters and the moisture content and the active earth pressure being 0. The critical moisture content of the upright or declining cohesionless slopes can be determined according to the relationship of the internal friction angle and the moisture content. The critical moisture content of the upright cohesive slopes can be determined by solving the equation of the critical moisture content. For the declining cohesive slopes, first, the cohesive soil having the cohesion and internal friction angle is replaced by only having the equivalent internal friction angle of the cohesionless soil according to the principle of the equal strength, then, the critical moisture content can be determined according to the relationship of the equivalent internal friction angle and the moisture content of the declining cohesionless.
Authors: Bao Long Zhu, Xi Yong Wu
Abstract: In late-July, 2005, a series of thunderstorms dropped 10 cm of rain in a 72-h period over southwestern Sichuan province. The storms also triggered more than 17 shallow landslides along the Lama Stream, about 2.5km from Jiuxiang Town, in Hanyuan County. Almost all of the landslides were translational, occurring along the contact between colluvial and eluvial soils and the underlying bedrock (claystones, mudstones, siltstones). 1# landslide was selected in the affected area for a detailed study of the shallow landslides. The record was made of the stratigraphy, slope geometry, landslide dimensions, hydrologic conditions, and contributing factors. Both colluvial soils and underlying bedrock were sampled for laboratory investigations, which included determination of natural water content, specific gravity, natural density, Atterberg limits, coefficient of consolidation, permeability, and shear-strength parameters. Data from laboratory tests were used to perform stability analyses by the infinite-slope analysis method, with respect to varying slope angles, strength parameters, and thicknesses of saturated colluvial and eluvial soils. The results of the study indicate that the shallow landslides of Xigeda strata occurred when the colluvial soils reached 90% to 100% saturation, depending upon the slope angles. It provides a basis for taking reasonable reinforcement measures for the landslides.
Authors: Xiao Li Liu, Jun Jie Yang
Abstract: For numerical simulation, the shear strength reduction technique (SSRT) is often used to evaluate slope or landslide stability. According to numerical computation results of slopes or landslides analyzed by SSRT, it can be found that with increase of the shear strength reduction factor, some of the soil elements will yield gradually to form a connected plastic zone, which is the potential slip surface of the slope or landslide. In view of the plastic resistance of soils, formation of the connected plastic zone does not always indicate that the landslide is about to failure. Other auxiliary criterion is necessary to predict whether a slope or landslide is in a critical state or not. Here, difference of the incremental percent of horizontal displacement of the outcropping slip surface node is regarded as the auxiliary indicator to distinguish the critical state of slopes or landslides after formation of the potential slip surface. With the ideas mentioned above, stability of a fossil landslide, Xietan landslide has been analyzed for the natural and the long-term reservoir water level conditions. Factors of safety of Xietan landslide by the numerical method have been compared with that by the limit equilibrium method, which indicates that the method used here for evaluating stability of Xietan landslide is feasible. Because numerical method has more advantages over the limit equilibrium method, the approach for evaluating stability of landslide here can be applied to more complicated or three-dimensional landslides or slopes further.
Authors: Wen Gao Tian
Abstract: This paper makes a comprehensive study of side slope control nearby apartment buildings in a university in Southwest China by investigating its geological condition, making a stability analysis, calculating landslide force, and designing a control project by adopting anti-slide piles plus drainage system, and explores the reasonable pile gap on the basis of anti-sliding stability and security and makes a conclusion.
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