Study on the Toe Segment Slippage Length for Large Bedded Consequent Slope

2011 ◽  
Vol 261-263 ◽  
pp. 1505-1509
Author(s):  
Qi Jun Hu ◽  
Qiang Xie ◽  
Li Ning Zheng
Keyword(s):  
Field Survey ◽  
Engineering Geology ◽  
Influence Factors ◽  
Slope Gradient ◽  
Mountain Areas ◽  
Slope Length ◽  
The Common

The large bedded slopes are the common engineering geology in mountain areas. In this paper, the influence factors, including the gradients, slope length, thickness of slide body, of the large bedded slopes were analyzed. The influence laws of the toe segment slippage length of the factors were obtained and the computing formulas of the toe segment slippage length were presented. The computing formulas were validated by the data of field survey. The results indicated that the toe segment slippage length which were determined by the slope length (L), thickness of slide body (H) and slope gradient (α) were according with the field survey and had the better safety coefficients.

Thickness Calculation of Roof Sloping Layer

2013 ◽  
Vol 321-324 ◽  
pp. 168-173
Author(s):  
Qi Heng Wang
Keyword(s):  
Heat Transfer ◽  
Layer Thickness ◽  
Engineering Practice ◽  
Slope Gradient ◽  
Minimum Thickness ◽  
Slope Length ◽  
Double Function ◽  
The Common ◽  
Flat Roof ◽  
The Mathematical Model

Sloping layer is an important level of Flat Roof. It usually have both slope and heat insulation double function. Its thickness is obtained through energy conservation. But because its thickness is variable, in engineering practice it is difficult to accurately determine the thickness. The sloping layer thickness depends on the requirements of the roof energy saving. It is important to thoroughly analyze the principle of roof heat transfer and to establish the mathematical model of roof heat transfer. Then through rigorous mathematical calculation, the common law of how to determine the sloping layer thickness can be summed up. According to the slope gradient, slope length and layer thickness calculation value, the maximum thickness and the minimum thickness can be ultimately determined.

Numerical Simulation on the Regular Pattern of the Lateral Friction Transmission of the Pile in the Incline under the Pulling Force

2014 ◽  
Vol 501-504 ◽  
pp. 248-253
Author(s):  
Liu Yong Cheng ◽  
Shan Xiong Chen ◽  
Xi Chang Xu ◽  
Xiao Jie Chu ◽  
Tong Bing Lei
Keyword(s):  
Numerical Simulation ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Influence Factors ◽  
Great Influence ◽  
Regular Pattern ◽  
Slope Gradient ◽  
Pulling Force ◽  
Lateral Friction

The regular pattern of the lateral friction transmission is one of the most critical influences on the ultimate uplift bearing capacity. The pile foundation in the incline under the pulling force has a wide variety of characteristics which is different with the normal pile. Numerical simulation is done by the use of FLAC3D in this paper. The regular pattern of the lateral friction transmission of the pile in the incline under the pulling force is studied. And the influence factors on the lateral friction transmission such as the slope gradient, the length and location of piles are discussed. The results show that the incline has a great influence on the lateral friction transmission. The lateral friction which is away from the incline-side is about 30% to 50% bigger than the incline-side. The slope gradient and the location of piles all have a great influence on the lateral friction transmission.

scholarly journals A survey of recent introduction events, spread and mitigation efforts of mynas (Acridotheres sp.) in Spain and Portugal

2015 ◽  
Vol 38 (1) ◽  
pp. 121-127
Author(s):  
S. Saavedra ◽  
◽  
A. Maraver ◽  
J. D. Anadón ◽  
J. L. Tella ◽  
...  
Keyword(s):  
Field Survey ◽  
Invasive Alien Species ◽  
Breeding Population ◽  
Island Populations ◽  
Common Myna ◽  
Breeding Populations ◽  
Preventive Actions ◽  
Acridotheres Tristis ◽  
The Common ◽  
Exponential Population Growth

The common myna Acridotheres tristis is listed among the world’s 100 worst invasive alien species. We combined previous records with a field survey to update the extent and fate of myna introductions in Spain and Portugal. Results suggest that there have been at least 22 independent accidental introductions of three myna species throughout the Iberian peninsula and three archipelagos since the early 1990s. While bank mynas (A. ginginianus) did not become established elsewhere, common mynas reached breeding populations on four islands. Eradication efforts allowed the extirpation of these breeding island populations, but common mynas continue to breed in the Tagus Estuary (continental Portugal). In this region, there is also a breeding population of crested mynas (A. cristatellus), which was undergone an exponential population growth in the last decade. To avoid further accidental introductions, eradication campaigns should be combined with preventive actions aiming to stop the trade of these species in Europe.

An Empirical Analysis on the Influence Factors of Industry Flow of Shaanxi Province Science and Technology Human Resources

2014 ◽  
Vol 700 ◽  
pp. 701-704
Author(s):  
Cheng Jun Wang ◽  
Huan Jia
Keyword(s):  
Human Resources ◽  
Field Survey ◽  
Science And Technology ◽  
Influence Factors ◽  
Multiple Linear Regression Model ◽  
Shaanxi Province ◽  
Gender Education ◽  
Professional Degree ◽  
Residential Moves ◽  
Technology Talent

Based on the field survey data,statisticsing and analysising the influence factors of industry flows of science and technology human resources in Shaanxi Province by using multiple linear regression model and Logistic regression model.The results show that: enterprise promotion chance, industry development ability, family factors and change lifestyle these four factors promote or weaken the effect on the flow of talent directly;Age,working ability,professional degree are the constitute factors influencing science and technology talent flow;However, the influence of gender, education, welfare and residential moves is not significant for industry flow of science and technology human resources.

scholarly journals Effect of Underground Coal Mining on Slope Morphology and Soil Erosion

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Liu Ning ◽  
Zhao Xiao-Guang ◽  
Song Shi-Jie ◽  
Zhou Wen-Fu
Keyword(s):  
Soil Erosion ◽  
Surface Morphology ◽  
Coal Mining ◽  
Underground Mining ◽  
Slope Gradient ◽  
Underground Coal Mining ◽  
Slope Length ◽  
Natural Slope ◽  
Included Angle ◽  
Working Face

Underground coal mining will cause large-scale surrounding rock movement, resulting in surface subsidence and irreversible deformation of surface morphology, which would lead to geological disasters and ecological environment problems. In this paper, FLAC3D numerical model is built based on the natural slope gradient, slope type, and included angle between the slope and working face, and their influences on the change of surface morphology and soil erosion caused by underground coal mining is studied. Research results show that the change of slope gradient caused by underground mining decreases with the increase of natural slope gradient, while slope length has opposite laws; different slope types have different changes of slope morphology. The order of slope types corresponding to gradient changes is mixed slope < uniform slope < concave slope < convex slope; the length of the concave and uniform slope decreases, and the convex and mixed slope length increases. When the included angle between the slope and working face is 0° ≤ α < 90°, the underground mining will cause the natural slope gradient increase, the change of the slope gradient will increase with the rise of the angle, the slope length will decrease, and the rate of decrease will be reduced with the increase of the angle. Coal mining will cause the increasing of the runoff and erosion modulus of slope, mainly runoff modulus.

Quaternary sedimentation, parna, landforms, and soil landscapes of the Wagga Wagga 1 : 100 000 map sheet, south-eastern Australia

Soil Research ◽  
1997 ◽  
Vol 35 (3) ◽  
pp. 643 ◽  
Author(s):  
Xiang Yang Chen
Keyword(s):  
Soil Properties ◽  
Morphological Properties ◽  
Dominant Factor ◽  
Wagga Wagga ◽  
Silty Clay ◽  
Clayey Soils ◽  
Slope Gradient ◽  
Slope Length ◽  
Eastern Australia ◽  
Sand Sheets

The Wagga Wagga 1 : 100 000 map sheet is on the Western Slopes of southern New South Wales. The regional topography changes from hills in the east and south-east to gently sloping rises and alluvial plains in the west. Aeolian clays (parna) form a consistent clay regolith regardless of the underlying geology in the gently sloping areas. In some alluvial plains and on some lower hill slopes, the surficial sediments contain a significant portion of reworked parna. In hilly areas, parna is poorly preserved except on some remnant ancient land surfaces, such as dissected plateaux and piedmont plains. The soil pattern in the area is well controlled by landform processes and history. On relatively steep hill slopes, locally derived materials from weathering of bedrock are usually the dominant components of the soils, and geology is the dominant factor controlling soil distribution. In contrast, the Murrumbidgee high floodplain is covered by uniform silty clay with deep clayey soils (brown/grey Dermosols). Before the mid-Holocene, the alluvium mainly comprised sands and gravels, which were reworked by wind forming sand sheets and sand mounds (source-bordering dunes) on which deep sandy soils (Rudosols) now occur. The sediments and soils on the alluvial plains of local streams vary according to their distance from the source area and the flooding frequency. Areas considered to be mantled by parna, uniform red clayey soils (haplic red Kandosols/Chromosols) occur. Although the distribution pattern of the soils is controlled by the landform evolution, the relationships between soil morphological properties and topography are not readily quantified. On the alluvial and gently sloping landforms, soil properties usually show little change even though slope gradient and slope length vary. Some soils, e.g. the Rudosols on the sand sheets, rarely show any topographic features which may indicate their presence. In limited areas, e.g. on steeper hills formed on metasedimentary rock, the soil properties vary with changes in topographic parameters (slope gradient and slope length).

Influence Factors on the Junction Line Entering for High-Temperature Alloys in Resistance Seam Welding

2010 ◽  
Vol 34-35 ◽  
pp. 19-24
Author(s):  
Yi Ping Chen ◽  
Wen He ◽  
Fu Qiang Zhu
Keyword(s):  
High Temperature ◽  
Crack Formation ◽  
Influence Factors ◽  
Protective Measure ◽  
Welding Quality ◽  
Joint Stress ◽  
Seam Welding ◽  
High Temperature Alloys ◽  
The Common ◽  
The Stability

The junction line entering is the common flaw that has often arisen in the resistance welding, especially within the resistance seam welding for the high-temperature alloys. It decreases the effective nugget diameter and reduces the tensile-shear strength of welding joint. Stress concentration can be easily created in the junction line entering under moving loading, which induces crack formation and thus seriously affects the welding quality. Owing to the plenty of factors effect on the junction line entering as well as big difficulties for experiment and the high failure rates，junction line entering has the great significance for the stability of welding quality to study its forming and protective measure. The junction line entering for the high-temperature alloy GH163 was studied through the seam welding as follows: surface conditions, welding variables, and agitation force. Some reasonable solutions for entering were provided.

scholarly journals The effects of slope length and coverage ratio on nitrogen and phosphorus loss in red soil Regions of southern China

2019 ◽  
Vol 136 ◽  
pp. 07028
Author(s):  
Qian Jing ◽  
Zhang Liping
Keyword(s):  
Southern China ◽  
Soil Nutrient ◽  
Nutrient Loss ◽  
Vegetation Coverage ◽  
Soil Productivity ◽  
Slope Gradient ◽  
Point Source Pollution ◽  
Nitrogen And Phosphorus ◽  
Slope Length ◽  
Coverage Ratio

Soil nutrient loss not only reduces soil productivity, but also causes non-point source pollution and accelerates the eutrophication of surface water. In order to understand the effects of slope lengths (2m, 4m), vegetation coverage ratios (15%, 30%, 45%, 60%, 90%) on the mechanisms of soil nutrient loss, the research studied the simulated rainfall experiment with the slope gradient of 20°, the rainfall intensity of 2.0 mm/min and the time of producing runoff for about 30 min. The experimental results showed that the runoff coefficient is mainly affected by vegetation coverage ratio.

scholarly journals Considering the relationship of slope and soil loss on skid trails in the north of Iran (a case study)

2013 ◽  
Vol 59 (No. 9) ◽  
pp. 339-344 ◽  
Author(s):  
M. Akbarimehr ◽  
H. Jalilvand
Keyword(s):  
Soil Loss ◽  
Rainfall Intensity ◽  
Forest Harvesting ◽  
Slope Gradient ◽  
Slope Length ◽  
The North ◽  
North Of Iran ◽  
Relationship Of ◽  
The Relationship

With increasing mechanization of forest harvesting operations the impacts on soil have increased quite dramatically. The objective of this paper was to examine the relationship of slope and soil loss. This research was carried out in parcels 14 and 26 of the third district of Nav-Asalem forest in the north of Iran. Erosion plots were 75, 150 and 225 m<sup>2</sup> with two slope classes. After each rainfall event the amount of runoff was measured; then, a sample was taken to determine the weight of soil loss. The results of correlation analysis by Pearson&rsquo;s test between soil loss and slope classes, soil loss and slope length showed that there was a significant (P &lt; 0.05) and positive correlation between the mentioned factors. Also, linear regression between soil loss, slope length and slope gradient was significant. It could be concluded that studying and underlying factors that increase soil loss such as soil type, rainfall intensity, should also be taken into consideration in future. Skid trail construction and skidding should be limited to the slope of &lt; 20%; machine traffic should be restricted. The above-mentioned conclusions can be applied to proper harvesting and management of forest ecosystems.&nbsp; &nbsp;

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