Results 21 to 30 of about 6,081 (259)

Precision planter monitoring system based on mobile communication network

IET Networks, EarlyView., 2022
Abstract Sowing is an important link in agricultural production and the basis for ensuring high yields and bumper harvests. Agriculture requires precision plows with good performance and stable work. However, the seeding process is in a completely closed state, and the operator relies mainly on experience to judge the operating state and performance of
Bing Li, Jiyun Li
wiley   +1 more source

Cyclic behaviour of an unsaturated silty soil subjected to hydro-mechanical damage [PDF]

E3S Web of Conferences, 2020
The dynamic behaviour of unsaturated soil subjected to cyclic loading is considered using two stress state variables, net normal stress and matric suction. Though the influence of excess pore-water pressures in fully saturated soils has been investigated
Nishimura Tomoyoshi
doaj   +1 more source

Soil compaction by wheeling: changes in soil suction caused by compression [PDF]

European Journal of Soil Science, 2010
Soil compaction caused by agricultural machinery has been increasingly recognized as a considerable problem facing intensive agriculture. Most of the models used to estimate soil deformation during the passage of machines are based on the concept of total stress: they have neglected an important stress variable for unsaturated ...
Cui, Kai, Défossez, Pauline, Cui, Yu-Jun, Richard, Guy   +3 more
openaire   +2 more sources

Soil desiccation cracks as a suction–contraction process [PDF]

Géotechnique Letters, 2017
Recent macro- and particle-scale advances in unsaturated soil behaviour have led to an enhanced understanding of the effects of moisture changes on soil response. This research examines desiccation cracks as a suction–contraction-coupled process using sand–clay mixtures.
Cordero Arias, Josbel Andreina, Useche, G, Prat, P. C., Ledesma Villalba, Alberto, Santamarina, J. C.   +4 more
openaire   +3 more sources

Comparative study on suction obtained using the membrane filter method from triaxial apparatus and pressure plate apparatus [PDF]

E3S Web of Conferences
To investigate the stability of the earth embankments and slope failures during natural disasters, it is necessary to consider that soil is naturally unsaturated.
Chowdepalli Bhargavi, Watanabe Kenji
doaj   +1 more source

Field instrumentation for real-time measurement of soil-water characteristic curve

International Soil and Water Conservation Research, 2022
Suction measurement has a vital role in unsaturated soil analysis. However, measuring soil suction remains a challenging task due to a number of issues such as the limited range of suction measurement, cavitation, or long equilibrium time.
Abdul Halim Hamdany, Yuanjie Shen, Alfrendo Satyanaga, Harianto Rahardjo, Tsen-Tieng Daryl Lee, Xuefeng Nong   +5 more
doaj   +1 more source

Strength and dilatancy of an unsaturated expansive soil at high suction levels

Journal of Rock Mechanics and Geotechnical Engineering
A series of suction-controlled triaxial tests was conducted on Nanyang expansive clay to investigate the effects of dry density and suction on dilatancy and strength.
Ke Chen, Xuzhen He, Fayun Liang, Daichao Sheng   +3 more
doaj   +1 more source

A ssessment of Various Methods to Measure the Soil Suction

International Journal of Innovative Technology and Exploring Engineering, 2020
The foundation of the lightweight structures is commonly in unsaturated state conditions because located above the ground-water table. The matric suction governs the hydro-mechanical behaviour of unsaturated soils. Soil suction estimation is challenging both in the field and lab.
Armand Augustin Fondjo, Elizabeth Theron, Richard P. Ray   +2 more
openaire   +2 more sources

Analysis of Distribution Model of Matric Suction of Land Subsidence Caused by Foundation Pit Dewatering

Engineering Transactions, 2015
By the soil matrix suction distribution under one-dimensional steady-state flow, soil permeability coefficient ks, infiltration intensity q and initial groundwater table factors that influence the matric suction of unsaturated soil were analyzed in this ...
Donglin WANG
doaj   +1 more source

Review and research on osmotic suction of saturated saline soils

Yantu gongcheng xuebao, 2020
In order to accurately calculate the osmotic suction in saturated saline soils under different salt contents, salt types and temperature conditions, firstly, a brief review is made of the research results of osmotic suction from the test and theoretical ...
ZHOU Feng-xi 1, 2, WANG Li-ye 1, LAI Yuan-ming 2
doaj   +1 more source