scholarly journals Dynamic Response Law of Loess Slope with Different Shapes

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Zhixin Yan ◽  
Sen Zhang ◽  
Xuedong Zhang ◽  
Ping Jiang
Keyword(s):  
Dynamic Response ◽  
Construction Projects ◽  
Reference Value ◽  
Northwest China ◽  
Scientific Basis ◽  
Slope Ratio ◽  
Loess Slope ◽  
Theoretical Support ◽  
Ratio Change ◽  
Different Shapes

Loess slope broadly distributes in Northwest China, making the slope of the area developed. And with the development number of construction projects still on the rise, this area is a high-intensity region with multiple earthquakes, resulting in landslide under earthquakes which is a very serious problem. However, the study on the loess slope dynamic response yet rarely involved the exploration of the influence of slope shapes, which leaves a hidden danger to the safety of local engineering. In this paper, a typical ladder-type loess slope in engineering is selected as a research object, and a numerical simulation model is established with FLAC3D program. The dynamic response of the loess slope with different shapes is studied deeply and systematically. Found a series phenomenon of earthquake response of loess slope with stepped slope series, the width of the platform and the slope ratio change under earthquakes. Meanwhile, the law of slope parameters such as slope series, platform width, and slope ratio on dynamic response of loess slope is revealed. The results provide theoretical support and scientific basis for the construction of the relevant projects in the area, which has important reference value to the safety of the engineering and the development of economic society.

scholarly journals Characteristics of Spatial-Temporal Evolution of Meteorological Drought in the Ningxia Hui Autonomous Region of Northwest China

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 992 ◽  
Author(s):  
Yuan Fang ◽  
Hui Qian ◽  
Jie Chen ◽  
Han Xu
Keyword(s):  
Time Scales ◽  
Wavelet Coefficient ◽  
Meteorological Drought ◽  
Northwest China ◽  
Scientific Basis ◽  
The North ◽  
Ningxia Hui Autonomous Region ◽  
Frequency Domains ◽  
Drought Disaster ◽  
Wavelet Variance

This study focuses on the intensity, duration, and frequency of meteorological droughts in Ningxia, northwest China, from 1960 to 2016. The analysis was conducted using the interannual characteristics of droughts, which were studied by the standardized precipitation evapotranspiration index (SPEI) at different timescales. Additionally, the correlation, mutability, and periodicity of two series in both the time and frequency domains in multi-time scales were scientifically analyzed using the wavelet analysis method. The results showed that the occurrence of drought had increased at different timescales (i.e., SPEI1, SPEI3, and SPEI12) during the past 57 years. The autumn drought had the largest share; spring is the high-occurrence season of extreme drought and the overall drought intensity increases towards the north. The periodical change of droughts was described with the wavelet coefficient real part value, wavelet power spectrum, and wavelet variance. The results showed that the 13- and 8-year time scales had the strongest oscillation and energy, and they were the first and the second major periods of drought. Moreover, the drought mutational fluctuations are in better agreement with that characterized by the SPEI12 and actual conditions. The results help to understand the occurrence and evolution of droughts in Ningxia, and to provide a scientific basis to reduce and prevent the drought disaster.

Physical model experiments for shallow failure in rainfall-triggered loess slope, Northwest China

2018 ◽  
Vol 78 (6) ◽  
pp. 4363-4382 ◽  
Author(s):  
Ping Sun ◽  
Gang Wang ◽  
L. Z. Wu ◽  
Ogbonnaya Igwe ◽  
Enzhen Zhu
Keyword(s):  
Physical Model ◽  
Northwest China ◽  
Model Experiments ◽  
Loess Slope ◽  
Shallow Failure

Impact of Railway Traction Energy Consumption on the Design Scheme

2012 ◽  
Vol 524-527 ◽  
pp. 3112-3117
Author(s):  
Fei Biao Bai ◽  
Hua Liu ◽  
Rong Hua Hou ◽  
Ge Fu Jiang
Keyword(s):  
Energy Consumption ◽  
Construction Projects ◽  
Scientific Basis ◽  
Total Energy Consumption ◽  
Railway Construction ◽  
Methods Of Calculation ◽  
Railway Industry ◽  
Railway Traction ◽  
The Impact ◽  
Energy Consumption Calculation

Facing the trend of energy crisis in the future, energy saving must start from aspects of the design. In China, the railway traction energy consumption is more than 80 per cent of energy consumption in the railway industry as a whole. First of all, this paper presents the energy consumption calculation of a single train, and analyzes the impact of energy consumption on the type of locomotive selection, then calculates total energy consumption and costs under the conditions of different ruling grades and route alternatives based on the life cycle of railway construction projects, which provides a scientific basis to determine the ruling grade and route alternatives. Finally, it illustrates an analysis of processes and methods of calculation through the Hainan West Ring Railway case.

Stability Calculation of High Side Slope of Diversion Power System Inlet on Left Bank of Jinchuan Power Station

2012 ◽  
Vol 212-213 ◽  
pp. 1071-1075
Author(s):  
Liang Qin Tang ◽  
Dong Yan Liu ◽  
Yong Jian Li
Keyword(s):  
Power System ◽  
Limit Equilibrium ◽  
Site Investigation ◽  
Scientific Basis ◽  
Left Bank ◽  
The Finite Element Method ◽  
Slope Ratio ◽  
Stability Calculation ◽  
Slope Structure ◽  
Structural Surface

The diversion power system intake excavation of Jinchuan Hydropower Station forms a slope of about 160m height; its stability is one of the main geological problems of the project. By detailed site investigation, the engineering geological characteristics of intake slope (including the lithology, slope structure, the structural surface and its combinations, rock weathering and unloading, hydrology etc) is analyzed in this paper. On the basis of site slope ratio statistics, the problem of how to select a safe and economic excavation slope ratio has been studied. The finite element method and rigid limit equilibrium method were used to calculate and analyze slope stability under various working conditions. The results of analysis evaluation provide a scientific basis for the design and construction.

Research of Dinosaurs Weathering Mechanism in Zhucheng Shandong

2015 ◽  
Vol 723 ◽  
pp. 757-762 ◽  
Author(s):  
Shang Kun Zhang ◽  
Sheng Xian Du ◽  
Xue Feng Yu ◽  
Guo Rong Zhang ◽  
Xiang Yu Luo ◽  
...  
Keyword(s):  
Water Temperature ◽  
Numerical Experiments ◽  
Laboratory Experiments ◽  
Reference Value ◽  
Scientific Basis ◽  
Geological Heritage ◽  
Physical Models ◽  
Process Water ◽  
Excavation Process ◽  
Weathering Process

In recent years, more and more domestic and international dinosaur fossils geological heritage were found, and many dinosaur fossils severe weathering within a few years after excavation.This study were based on Zhucheng dinosaur fossils ,the research of weathering mechanism of dinosaur fossils were from aspects of physical - mechanical characteristics.Means of laboratory experiments, physical models, theories and numerical experiments were used to explores the effect of weathering by the factors of excavation process, water, temperature , acidic substances and other factors on dinosaur fossils and relics.The results reveal the physical destruction of Shandong Zhucheng dinosaur fossils in the mechanism and characteristics of weathering process can provide theoretical and scientific basis for the protection of fossils, and other parts of the mechanism of weathering and protection of dinosaur fossils study provides reference value.

scholarly journals A sensitivity study of fast outlet glaciers to short timescale cyclical perturbations

2015 ◽  
Vol 9 (1) ◽  
pp. 223-250 ◽  
Author(s):  
E. Aykutlug ◽  
T. K. Dupont
Keyword(s):  
Dynamic Response ◽  
Reference Value ◽  
Sensitivity Study ◽  
West Antarctica ◽  
Ice Dynamics ◽  
Ice Volume ◽  
Asymmetric Response ◽  
Short Timescale ◽  
External Forcings ◽  
Higher Sensitivity

Abstract. The dynamic response of outlet glaciers on short (annual to decadal) timescales is affected by various external forcings, such as basal or oceanic conditions. Understanding the sensitivity of the dynamic response to such forcings can help assess more accurate ice volume projections. In this work, we investigate the spatiotemporal sensitivity of outlet glaciers to fast cyclical forcings using a one-dimensional depth and width-averaged heuristic model. Our results indicate that even on such short timescales, nonlinearities in ice dynamics may lead to an asymmetric response, despite the forcing functions being symmetric around each reference value. Results also show that such short-timescale effects become more pronounced as glaciers become closer to flotation. While being qualitatively similar for both downsloping and upsloping bed geometries, the results indicate higher sensitivity for upsloping ("West Antarctica-like") beds. The range in asymmetric response for different configurations motivate parameterizing or including short-timescale effects in models while investigating the dynamic behavior of outlet glaciers.

Normal Reference Value of Hemoglobin of Older Boys and Geographical Factors

2003 ◽  
Vol 23 (5-6) ◽  
pp. 305-312 ◽  
Author(s):  
Ge Miao
Keyword(s):  
Regression Analysis ◽  
Linear Regression Analysis ◽  
Reference Value ◽  
Multiple Linear Regression Analysis ◽  
Scientific Basis ◽  
Regression Equation ◽  
Normal Reference ◽  
Geographical Factors ◽  
Normal Reference Value ◽  
The Relationship

In order to supply a scientific basis for uniting the normal reference value standard of hemoglobin of Chinese older boys. Methods: A research is made about the relationship between the normal reference value of 14751 examples of hemoglobin of older boys and five geographical factors in 92 areas in China, which are determined by the hemoglobincyanide method. Results: It is found that the correlation of geographical factors and the normal reference value of hemoglobin of older boys are quite significant (F = 9.68). By using the method of multiple linear regression analysis, one regression equation is inferred: Ŷ = 108.0 + 0.003633X1 + 0.003945X2 + 0.1680X3 − 0.6310X4 + 0.005518X5 ± 8.3 Conclusion: If geographical values are obtained in some areas, the normal reference value of hemoglobin of older boys of this area can be reckoned by using the regression equation. Furthermore, the depending on the geographical factors, China can be divided into six districts: Qingzang, Southwest, Northwest, Southeast, North and Northeast district.

scholarly journals Design of Senior Family Bathroom System Based on Demand Theory

2020 ◽  
Vol 179 ◽  
pp. 02080
Author(s):  
Rong Han ◽  
Dandan Shao ◽  
YuXin Wang
Keyword(s):  
Elderly Population ◽  
Reference Value ◽  
The Elderly ◽  
Population Based ◽  
Psychological Characteristics ◽  
Psychological Status ◽  
Space System ◽  
System A ◽  
Theoretical Support ◽  
Demand Theory

Aiming at the characteristics of the elderly population, based on the demand theory, this paper proposes a design scheme of a suitable family bathroom system. Based on the theory of Maslow’s demand theory, understand the real psychological status of the elderly through theoretical transformation, analyze the physical and psychological characteristics of the elderly, and simulate the specific behavior of the elderly in the bathroom space system through user interviews. In response to the elderly’s needs for the space, facilities and supporting facilities of the bathroom system, a type of bathroom space was finally selected to carry out the design practice, which provided certain theoretical support and practical reference value for the subsequent research of bathroom products for the elderly.

Study on Dynamic Response of Jacket Structure during Floating Transportation

2013 ◽  
Vol 405-408 ◽  
pp. 882-885
Author(s):  
Bing Jiang ◽  
Xuan Jun Huang
Keyword(s):  
Dynamic Response ◽  
Physical Model ◽  
Model Test ◽  
Deep Water ◽  
Scientific Basis ◽  
The State ◽  
Physical Model Test ◽  
Study Results ◽  
Wave Conditions

Through the physical model test research on the dynamic response of jacket structure during floating transportation, the state of motion and the cable towing force under different wave conditions are given. The study results not only the scientific basis for the jacket structure construction, but also can be regarded as the relevant technical reserves of the jacket structure for deep-water offshore wharf construction in our country.

scholarly journals The cyclic expansion and contraction characteristics of a loess slope and implications for slope stability

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hengxing Lan ◽  
Xiaoxia Zhao ◽  
Renato Macciotta ◽  
Jianbing Peng ◽  
Langping Li ◽  
...  
Keyword(s):  
Quantitative Relationship ◽  
Northwest China ◽  
Deformation Monitoring ◽  
Physical Models ◽  
Slope Instability ◽  
Cyclic Behavior ◽  
Shanxi Province ◽  
Maximum Expansion ◽  
Loess Slope ◽  
Contraction And Expansion

AbstractLoess covers approximately 6.6% of China and forms thick extensive deposits in the northern and northwestern parts of the country. Natural erosional processes and human modification of thick loess deposits have produced abundant, potentially unstable steep slopes in this region. Slope deformation monitoring aimed at evaluating the mechanical behavior of a loess slope has shown a cyclic pattern of contraction and expansion. Such cyclic strain change on the slope materials can damage the loess and contribute to slope instability. The site showing this behavior is a 70-m high loess slope near Yan’an city in Shanxi Province, northwest China. A Ground-Based Synthetic Aperture Radar (GB-SAR) sensor and a displacement meter were used to monitor this cyclic deformation of the slope over a one-year period from September 2018 to August 2019. It is postulated that this cyclic behavior corresponds to thermal and moisture fluctuations, following energy conservation laws. To investigate the validity of this mechanism, physical models of soil temperature and moisture measured by hygrothermographs were used to simulate the observed cyclic deformations. We found good correlations between the models based on the proposed mechanism and the exhibited daily and annual cyclic contraction and expansion. The slope absorbed energy from the time of maximum contraction to the time of maximum expansion, and released energy from the time of maximum expansion to the time of maximum contraction. Recoverable cyclic deformations suggest stresses in the loess are within the elastic range, and non-recoverable cyclic deformations suggest damage of the loess material (breakage of bonds between soil grains), which could lead to instability. Based on these observations and the models, we developed a quantitative relationship between weather cycles and thermal deformation of the slope. Given the current climate change projections of temperature increases of up to 3.5 °C by 2100, the model estimates the loess slope to expand about 0.35 mm in average, which would be in addition to the current cyclic “breathing” behavior experienced by the slope.

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