scholarly journals Entropy Base Estimation of Moisture Content of the Top 10-m Unsaturated Soil for the Badain Jaran Desert in Northwestern China

Entropy ◽  
2016 ◽  
Vol 18 (9) ◽  
pp. 323 ◽  
Author(s):  
Xiangyang Zhou ◽  
Wenjuan Lei ◽  
Jinzhu Ma
Keyword(s):  
Moisture Content ◽  
Unsaturated Soil ◽  
Northwestern China ◽  
Badain Jaran Desert

Moisture Content's Influence to Pile Bearing Capacity and Finite Element Analysis

2014 ◽  
Vol 633-634 ◽  
pp. 922-926
Author(s):  
Li Hua Zhang ◽  
Li Yu ◽  
Zhe Jun Quan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Moisture Content ◽  
Bearing Capacity ◽  
Unsaturated Soil ◽  
Vertical Displacement ◽  
Relative Displacement ◽  
Engineering Practice ◽  
Element Analysis ◽  
Lateral Extrusion

This essay analyzes stress between pile and soil, occupying moisture content data of unsaturated soil in Nanchang with ANSYS. In accordance with engineering practice, it adopts three-dimensional solid model, the same geometric size with engineering practice. It simulates interrelation between pile and soil with contact unit, and shows ontology relation of soil with D-P elastic-plastic model. Convergence has been made with selection and calculation of parameter. The greater the moisture content gets, the smaller the pile body vertical displacement makes. In other words, the smaller the relative displacement between pile and soil gets, the lower the lateral extrusion stress from pile to soil becomes. Keywords: unsaturated soil; shear strength; pile bearing capacity; finite element analysis; moisture content

Experimental Study of Static Disintegration on Unsaturated Soil

2014 ◽  
Vol 580-583 ◽  
pp. 68-72 ◽  
Author(s):  
Nian Qin Wang ◽  
Qing Tao Wang ◽  
Qian Xue ◽  
Xiao Ling Liu
Keyword(s):  
Experimental Study ◽  
Moisture Content ◽  
Unsaturated Soil ◽  
Initial Moisture Content ◽  
Effective Porosity ◽  
Disintegration Rate ◽  
Porosity Ratio ◽  
Water Rate ◽  
Critical Moisture ◽  
Relationship Of

In order to explore the disintegration characteristics of compacted loess, through the unsaturated soil disintegration instrument by independently developed,conduct the soaking disintegration experimental study on remolded soil unsaturated samples,obtained a series of experimental results:①The curves can be divided into the slow disintegration, rapid disintegration and stabilization of disintegration in three stages，the degree of compaction and water rate impact on rapidly disintegrating stage;②When the degree of compaction is certain,the disintegration rate decreased with the water contented increasing,the decreased amplitude is increasing with the moisture content increased to18%,the disintegration characteristics disappeared with the moisture content increased to 22%;③When the initial moisture content is certain, the disintegration rate decreased with the degree of compaction increasing, The time significantly prolonged when the disintegration completed. the decreased amplitude is increasing with the degree of compaction increased to 95%,the disintegration characteristics basically disappeared. Based on the relationship of degree of compaction and the moisture content to void ratio, the thesis establishes the model between the disintegration rate and the effective porosity ratio,the formula can be used to calculate the disintegration rate of compacted loess.The specific conclusions are:①When the critical moisture content increased to 22%,the disintegration characteristics disappeared;②When the critical degree of compaction increased to95%，the disintegration characteristics also disappeared.

scholarly journals Effect of soil moisture content on the bearing capacity of small bored piles in the unsaturated soil of Maringá, Paraná, Brazil

2021 ◽  
Vol 337 ◽  
pp. 03006
Author(s):  
Verônica Ricken Marques ◽  
Antonio Belincanta ◽  
Mary-Antonette Beroya-Eitner ◽  
Jorge Luis Almada Augusto ◽  
Ewerton Guelssi ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Bearing Capacity ◽  
Water Content ◽  
Unsaturated Soil ◽  
Soil Layer ◽  
Matric Suction ◽  
Load Test ◽  
Degree Of Saturation ◽  
Static Load Test

In this study, the influence of soil moisture on the bearing capacity of piles founded in an unsaturated clay soil was investigated. The soil studied, composing the upper soil layer in Maringá, Brazil, is lateritic, has degree of saturation between 37% and 70% and has collapsible behaviour when wet. The bearing capacity was determined by full-scale load tests following the Brazilian Standard for Static Load Test. Two pile lengths, 4 m and 8 m, were considered. To analyse the influence of soil moisture, two tests were performed for each pile length: one in soil in its natural moisture content and another in pre-moistened soil. Results show that for both pile lengths, an increase in water content caused a significant reduction in bearing capacity, which is attributed to the decrease in the matric suction of the soil. This is confirmed by the results of the initial evaluation made on the variation of matric suction and its contribution to the bearing capacity with changes in water content. In summary, this study confirms that the pile bearing capacity in unsaturated soil is dependent on soil water content, highlighting the fact that the approach of assuming full saturation condition in the evaluation of the pile bearing capacity in such soil may give erroneous results. Moreover, this study demonstrate that the empirical methods most commonly used in Brazil for pile bearing capacity determination, the Décourt & Quaresma and Aoki & Velloso methods, are overly conservative when applied to the Maringá soil.

Field measurement of clear-sky solar irradiance in Badain Jaran Desert of Northwestern China

2013 ◽  
Vol 122 ◽  
pp. 194-207 ◽  
Author(s):  
Jianrong Bi ◽  
Jianping Huang ◽  
Qiang Fu ◽  
Jinming Ge ◽  
Jinsen Shi ◽  
...  
Keyword(s):  
Field Measurement ◽  
Solar Irradiance ◽  
Northwestern China ◽  
Badain Jaran Desert ◽  
Clear Sky

Applicability of rare earth elements in eolian sands from desert as proxies for provenance: A case study in the Badain Jaran Desert, Northwestern China

CATENA ◽  
2021 ◽  
Vol 207 ◽  
pp. 105647
Author(s):  
Zhuolun Li ◽  
Qiujie Chen ◽  
Shipei Dong ◽  
Dezhong Zhang ◽  
Xinhui Yu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Northwestern China ◽  
Badain Jaran Desert

Diffusion of Iodine and Technetium-99 Through Waste Encasement Concrete and Unsaturated Soil Fill Material

2004 ◽  
Vol 824 ◽  
Author(s):  
Shas V. Mattigod ◽  
Greg A. Whyatt ◽  
J. R. Serne ◽  
Marcus I. Wood
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Unsaturated Soil ◽  
Soil Moisture Content ◽  
Highly Sensitive ◽  
Order Of Magnitude ◽  
Moisture Conditions ◽  
Long Term Performance ◽  
Term Performance

AbstractAn assessment of long-term performance of low level waste-enclosing cement grouts requires diffusivity data for radionuclide species such as, 129I and 99Tc. The diffusivity of radionuclides in soil and concrete media was collected by conducting soil-soil and concrete-soil half-cell experiments. The soil diffusivity coefficients for iodide were 7.03 × 10−8 cm2/s and 2.42 × 10−7cm2/s for soils at 4% and 7% moisture contents, respectively. Iodide diffusivity in soil is a function of moisture content and is about an order of magnitude slower at lower moisture content. The soil diffusivity coefficients for 99Tc were 5.89±0.80 × 10−8 cm2/s (4% moisture content) and 2.04±0.57 × 10−7 cm2/s (7% moisture content), respectively. The soil diffusivity of iodide and 99Tc were similar in magnitude at both water contents, indicating that these ions have similar diffusion mechanisms in unsaturated coarse-textured Hanford soil. The diffusivity of iodide in concrete ranged from 2.07 × 10−14 cm2/s (4% soil moisture content) to 1.31 × 10−12 cm2/s (7% soil moisture content), indicating that under unsaturated soil moisture conditions, iodide diffusivity is highly sensitive to changing soil moisture conditions. Depending on the soil moisture content, the diffusivity of 99Tc in concrete ranged from 4.54 × 10−13 cm2/s to 8.02 × 10−12 cm2/s. At 4% soil moisture content, iodide diffused about 20 times more slowly than 99Tc, and at 7% soil moisture content, iodide in concrete diffused about 6 times slower than 99Tc.

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