The research of the relationship between single ultimate bearing capacity and final pressure of jacked tube pile in the Yellow River alluvial plain

2011 ◽  
Author(s):  
XiaoHong Hao
Keyword(s):  
Bearing Capacity ◽  
Yellow River ◽  
Ultimate Bearing Capacity ◽  
Alluvial Plain ◽  
The Yellow River ◽  
The Relationship

Experimental Study on Compaction Characteristics of High Liquid Limit Clay of the Yellow River Alluvial Plain and its Subgrades Filling Technology

2011 ◽  
Vol 368-373 ◽  
pp. 2558-2561
Author(s):  
Hong Xia Yang
Keyword(s):  
Yellow River ◽  
Liquid Limit ◽  
Alluvial Plain ◽  
Unit Weight ◽  
The Yellow River ◽  
Construction Technology ◽  
Compaction Characteristics ◽  
Dry Unit Weight ◽  
Controlling Measures ◽  
The Relationship

Based on the geologic exploration materials and indoor test of Ji-He expressway,analysed the compaction characteristics of high liquid limit clay of the Yellow River alluvial plain,the relationship among compaction work and moisture content and dry unit weight,and the changing rules of the CBR value in different compaction works with the change of moisture content.Demonstrated that high liquid limit clay of the Yellow River alluvial plain can be used in expressway subgrades filling. Moreover, through the experimental sections of subgrades filling,the reasonable construction technology and quality controlling measures is put forward, and provides reference of subgrades filling with high liquid limit clay of the Yellow River alluvial plain.

Strength and Deformation Characteristics of Stabilized Silty Soil

2012 ◽  
Vol 594-597 ◽  
pp. 512-515
Author(s):  
Zheng Rong Zhao ◽  
Hong Xia Yang
Keyword(s):  
Internal Friction ◽  
Brittle Failure ◽  
Yellow River ◽  
Strain Curve ◽  
Friction Angle ◽  
Confining Pressure ◽  
Alluvial Plain ◽  
The Yellow River ◽  
Stress Strain Curve ◽  
Silty Soil

Combined with the silty soil characteristics of the Yellow River alluvial plain and the subgrade filling of Ji-He expressway, the paper discusses silty soil, stabilized silty soil strength and stress-stain characteristics through the indoor triaxial shear test. The results show that the remodeling silty soil has obvious peak, brittle failure, low residual strength after being destroyed and the stress-strain curve shows a softening type in confining pressure 100kPa lower stress level. In the confining pressure 400kPa higher stress level, soil samples peak is not obvious,mainly plastic failure and the stress-strain curve is close to a hardening type. Compared to mixed with 8% lime, stabilized silty soil of mixed with 4% cement and 4% lime shows that the partial stress peak is more obvious when destroyed and the residual strength is drastically reduced and more incline to brittle failure. In different the age, compared to mixed with 8% lime, stabilized silty soil of mixed with 4% cement and 4% lime shows that internal friction angle becomes larger and cohesion improves gradually whose amplitude is much larger than internal friction angle. Therefore, a more effective way to stabilize the silty soil of the Yellow River alluvial plain is to select silty soil mixed with 4% cement and 4% lime.

scholarly journals Hydrogeochemistry and Quality Assessment of Shallow Groundwater in the Southern Part of the Yellow River Alluvial Plain (Zhongwei Section), Northwest China

2014 ◽  
Vol 18 (1) ◽  
pp. 27-38 ◽  
Author(s):  
Peiyue Li ◽  
Jianhua Wu ◽  
Hui Qian
Keyword(s):  
Water Quality ◽  
Yellow River ◽  
Saturation Index ◽  
Shallow Groundwater ◽  
Northwest China ◽  
Alluvial Plain ◽  
Total Hardness ◽  
The Yellow River ◽  
Human Consumption ◽  
Mineralized Water

<p class="MsoNormal" style="line-height: 200%;">Statistical analyses, a Piper diagram, the saturation index and the correlations of chemical parameters were used to reveal the hydrogeochemistry and hydrogeochemical evolution of shallow groundwater in the southern part of the Zhongwei section of the Yellow River alluvial plain. The water quality for agricultural and domestic uses was also assessed in the study. The results suggest that the shallow groundwater in the study area is fresh to moderately mineralized water. Higher Ca<sup>2+</sup> and HCO<sub>3</sub><sup>-</sup> are observed in the less mineralized water, whereas Na<sup>+</sup> and SO<sub>4</sub><sup>2-</sup> are common ions in the highly mineralized water. The major hydrochemical facies for groundwater with total dissolved solids (TDS) &lt;1 g/L are HCO<sub>3</sub>-Ca·Mg and HCO<sub>3</sub>-Ca·Na·Mg, and for groundwater with TDS &gt; 1 g/L, SO<sub>4</sub>·Cl-Na and SO<sub>4</sub>·Cl-Na·Mg·Ca are the predominant hydrochemical types. The main reactions in the groundwater system are the dissolution/precipitation of gypsum, fluorite, halite, calcite and dolomite. Cation exchange is also important in controlling the groundwater chemistry. The water samples assessed in the paper are of acceptable quality for agricultural use, but most of them are not fit for direct human consumption (drinking). TDS, total hardness (TH), Cl<sup>-</sup> and SO<sub>4</sub><sup>2-</sup> are the main indices that result in the poor drinking water quality.</p><p class="MsoNormal" style="line-height: 200%;"> </p><p class="MsoNormal" style="line-height: 200%;"><strong>Resumen</strong></p><p>Análisis estadísticos, un diagrama de Piper, el índice de saturación y la correlación de los parámetros químicos fueron utilizados para revelar la hidrogeoquímica y la evolución hidrogeoquímica de las aguas subterráneas poco profundas en la parte sur de la sección Zhongwei en la planicie aluvial del río Amarillo. La calidad del agua para el uso doméstico y agrícola también fue evaluada en este estudio. Los resultados sugieren que las aguas subterráneas poco profundas en el área de estudio son entre frescas y moderadamente mineralizadas. Un índice mayor de Ca2+ y HCO3- se observó en las aguas menos mineralizadas, mientras que Na+ y SO42- son iones comunes en las aguas altamente mineralizadas. Los perfiles hidroquímicos predominantes para las aguas subterráneas con Total de Sólidos Disueltos (TDS) &lt;1 g/L son HCO3-Ca·Mg y HCO3-Ca·Na·Mg, y para las aguas subterráneas con TDS &gt;1 g/L, SO4·Cl-Na y SO4·Cl-Na·Mg·Ca. Las mayores reacciones en el sistema de aguas subterráneas son la disolución/ precipitación de yeso, fluorita, halita, calcita y dolomita. El intercambio de cationes también es importante en el control de la química de las aguas subterráneas. Las muestras de agua evaluadas en este manuscrito son de calidad aceptable para el uso agrícola, pero la mayoría no son aptas para el consumo humano. El índice TDS, la dureza total del agua (TH), Cl- y SO42- son las razones principales que influyen en la baja calidad de esta agua.</p>

Study on the Settlement of an Expressway Foundation with Cement Mixing Piles in the Yellow River Alluvial Plain

2016 ◽  
Author(s):  
Zhanyong Yao ◽  
Kai Yao ◽  
Xiaomeng Zhang ◽  
Xiuguang Song ◽  
Teng Ma ◽  
...  
Keyword(s):  
Yellow River ◽  
Alluvial Plain ◽  
The Yellow River

Practical Calculation of Highway Foundation Settlement of the Yellow River Alluvial Plain

2011 ◽  
Vol 90-93 ◽  
pp. 260-263
Author(s):  
Hong Xia Yang ◽  
Zheng Rong Zhao
Keyword(s):  
Yellow River ◽  
Summation Method ◽  
Alluvial Plain ◽  
The Yellow River ◽  
Practical Calculation ◽  
Foundation Settlement ◽  
Theory Method ◽  
Actual Observation ◽  
Final Settlement ◽  
Formula Method

In order to solve the problem of great error in calculating the Yellow River alluvial plain highway’s foundation settlement with delamination summation-method and regulate formula method,we put forward the reason of calculating the final settlement by drilling standard penetration number.It is according to the principles of delamination summation-method and elastic theory method and it is combined with engineering prospecting tests results.Finally,we inference the empirical formula in calculating the final settlement by standard penetration number.The comparison of the calculation of the final settlement by drilling standard penetration number and the statistics by actual observation of jinan-heze expressway has proved the correctness of calculation formula.

scholarly journals Study on the Relationship between Topological Characteristics of Vegetation Ecospatial Network and Carbon Sequestration Capacity in the Yellow River Basin, China

2021 ◽  
Vol 13 (23) ◽  
pp. 4926
Author(s):  
Minzhe Fang ◽  
Guoxin Si ◽  
Qiang Yu ◽  
Huaguo Huang ◽  
Yuan Huang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Carbon Sequestration ◽  
River Basin ◽  
Yellow River ◽  
Yellow River Basin ◽  
The Yellow River ◽  
Carbon Neutrality ◽  
Vegetation Carbon ◽  
The Yellow River Basin ◽  
The Relationship

Achieving carbon neutrality is a necessary effort to rid humanity of a catastrophic climate and is a goal for China in the future. Ecological space plays an important role in the realization of carbon neutrality, but the relationship between the structure of vegetation ecological space and vegetation carbon sequestration capacity has been the focus of research. In this study, we extracted the base data from MODIS products and other remote sensing products, and then combined them with the MCR model to construct a vegetation ecospatial network in the Yellow River Basin in 2018. Afterward, we calculated the topological indicators of ecological nodes in the network and analyzed the relationship between the carbon sequestration capacity (net biome productivity) of ecological nodes and these topological indicators in combination with the Biome-BGC model. The results showed that there was a negative linear correlation between the betweenness centrality of forest nodes and their carbon sequestration capacity in the Yellow River Basin (p < 0.05, R2 = 0.59). On the other hand, there was a positive linear correlation between the clustering coefficient of grassland nodes and their carbon sequestration capacity (p < 0.01, R2 = 0.49). In addition, we briefly evaluated the vegetation ecospatial network in the Yellow River BASIN and suggested its optimization direction under the background of carbon neutrality in the future. Increasing the carbon sequestration capacity of vegetation through the construction of national ecological projects is one of the ways to achieve carbon neutrality, and this study provides a reference for the planning of future national ecological projects in the Yellow River Basin. Furthermore, this is also a case study of the application of remote sensing in vegetation carbon budgeting.

scholarly journals Precipitation and runoff variations in the Yellow River Basin of China

2016 ◽  
Vol 19 (1) ◽  
pp. 138-155 ◽  
Author(s):  
Jianxia Chang ◽  
Jie Wei ◽  
Yimin Wang ◽  
Meng Yuan ◽  
Jiacheng Guo
Keyword(s):  
Human Activities ◽  
Yellow River ◽  
Influencing Factor ◽  
Yellow River Basin ◽  
The Yellow River ◽  
Runoff Variation ◽  
Abrupt Changes ◽  
Cumulative Curve ◽  
The Yellow River Basin ◽  
The Relationship

Runoff in the Yellow River (YR) of China is steadily declining due to climate change and human activities. In this study, the basic trend and abrupt changes of precipitation at 63 meteorological stations and runoff as measured at six hydrological stations from 1956 to 2010 are analyzed. Results indicate that 38 stations exhibit negative precipitation trends. These stations are mainly located in the lower reaches. All six hydrological stations exhibit declining runoff trends. Abrupt runoff changes were mainly noted in the downstream portion of the basin. These variations then expanded to the middle and upper reaches. A precipitation–runoff double cumulative curve was used to detect the breakpoint of the precipitation–runoff relationship and to identify the impacts of human activities on runoff in the YR. Results show that the relatively uniform precipitation–runoff relationship has changed since 1993 in the upstream reaches and since 1970 in the middle and downstream reaches. Additionally, the relationship was more sensitive in the Lanzhou section. Human activities have become the dominant influencing factor on runoff variation since the 1970s. After the 1990s, the percentages of runoff variations due to human activities were 74.87%, 82.2%, 80.63%, and 88.71% at the Lanzhou, Toudaoguai, Huayuankou, and Lijin stations, respectively.

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