Entity

Time filter

Source Type


Wu Y.,PLA Logistical Engineering University | Liu D.-S.,Chongqing Bureau of Geology and Minerals Exploration | Lu X.,PLA Logistical Engineering University | Song Q.-H.,PLA Logistical Engineering University
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2011

From the point of view of system theory, the landslide hazard system includes two subsystems: subsystem of hazard and subsystem of stricken. The consequence of landslide hazard is based on the interaction of these two subsystems, previous studies concenerate on evaluation of landslide stability. Hence, the study of a typical element at landslide risk is focused. And a method to calculate failure probability of typical element (frame structure) at landslide risk is discussed. Furthermore, the influences of both impact force and impact resistance-capability of element at risk on failure probability are analyzed, which shows that, for each elements at risk, the landslide impact area can be divided into absolutely dangerous zone, relatively dangerous zone and absolutely safety zone. In addition, with the condition that the structure failure probability is above 50%, as the variability of impact force increases, the structure failure probability decreases; with the condition that structure failure probability is below 50%, as the variability of impact force increases, the structure failure probability also increases. Source


Wu Y.,PLA Logistical Engineering University | Liu D.-S.,Chongqing Bureau of Geology and Minerals Exploration | Lu X.,PLA Logistical Engineering University | Song Q.-H.,PLA Logistical Engineering University
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Property risk assessment for single landslide is the foundation of prevention and mitigation measures. Since we can not evaluate the vulnerability of elements at risk quantitatively, property risk assessment of single landslide becomes hard to achieve accuracy. In light of the typical elements at risk, a quantitative assessment model for property risk caused by single landslide is presented, which defined by probability of slope fall, reliability of structure and the value of elements at risk. Avoiding the vulnerability evaluation, assesses the property risk from a new point of view. Through the research, it is shown that the model can reflect the influence of landslide factors exactly, and provides a new way to assess property risk quantitatively for single landslide. A new conception of safety zone that based on this model is introduced. For each one of elements at risk, the impact area of single landslide can be divided into dangerous zone, relatively dangerous zone and safety zone. Source


Wu Y.-X.,PLA Logistical Engineering University | Liu D.-S.,Chongqing Bureau of Geology and Minerals Exploration | Song Q.-H.,PLA Logistical Engineering University | Song Q.-H.,Lanzhou University | Ou Y.-H.,PLA Logistical Engineering University
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

Currently, the calculation method of landslide-thrust and internal forces of anti-slide pile in essence belongs to the fixed value method. However, for the lack of considering geotechnical uncertainties, inadequate and excessive support problems for the anti-slide piles cannot be ignored. Thus, based on strength reduction of finite element method, the reliability analysis method of landslide-thrust and internal forces of anti-slide pile is proposed. In this method, the limit analysis, finite element analysis as well as reliability analysis are included. In the calculation process, 2-node beam element is used to simulate the stress condition of anti-slide pile; and the Latin hypercube sampling (LHS) method is used for reliability calculation; and above process is realized in the numerical calculation program. Landslide-thrust and internal forces of anti-slide pile are statistically analyzed; and function distributions can be achieved. With the control values of a given failure probability, the design values of landslide-thrust and internal forces can be accurately determined. Typical example analysis shows that the proposed method is significantly different from the general methods; it can reflect the slope present situation, overall characteristics and the variability of material parameters; and the results are closer to the reality. Source


Wu Y.,PLA Logistical Engineering University | Lu X.,PLA Logistical Engineering University | Liu D.-S.,Chongqing Bureau of Geology and Minerals Exploration | Zhu J.-K.,PLA Logistical Engineering University
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2012

Small and medium landslides are widely distributed, the prediction mainly relies on the monitoring and controlling systems executed by the masses. The advantages and disadvantages of various stability assessment methods are compared. The engineering analogy method accords with the requirements for small and medium landslide assessment. A method is illustrated based on Fisher discrimiant function to cope with the small and medium potential landslide stability assessment. The impact factors of landslides is explored with the historical data. The stability is taken as a multi-dimensional statistical variable and project into one-dimensional straight line. Distance discriminant method is used to construct a classification criterion. The applicability of this method is explored, and assessed the landslides in Chongqing Wulong by this method. The results show that accuracy of this method is about eighty percent. This method is suitable for the city of Chongqing or other areas with the similar geological environment. Source


Wu Y.-X.,PLA Logistical Engineering University | Liu D.-S.,Chongqing Bureau of Geology and Minerals Exploration | Song Q.-H.,PLA Logistical Engineering University | Song Q.-H.,Lanzhou University | Ou Y.-H.,PLA Logistical Engineering University
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

The traditional strength reduction finite element method (SRFEM) is widely used in numerical analysis of slope stability. However, for the lack of considering geotechnical uncertainties, it still cannot be directly applied to the reliability analysis of slope stability, especially the dynamic stability problems. Thus, based on the SRFEM, the reliability analysis method of slope dynamic stability under seismic loading is proposed. In this method, the finite element limit analysis, dynamic analysis and reliability analysis are included to analyze the reliability problems of slope under seismic loading; and above process is realized in the numerical calculation program. For the traditional method, the acquirement of slope safety factor should be based on continuous manual pilot calculations, which makes batch processing impossible. But in the proposed method, above problem is solved through the improved slope dynamic failure criterion and the corresponding calculation program. The case study shows that the proposed method is significantly different from the general methods; it can relatively comprehensively reflect the dynamic characteristics of rock mass, the variability and correlation of material parameters. The results are closer to the reality. The proposed method not only widens the application scope of SRFEM, but also provides a new effective way for the reliability analysis of slope dynamic stability. Source

Discover hidden collaborations