Seismic Performances of Pile Groups in Inclined Soil Layers Subjected to Strong Motions

2010 ◽  
Author(s):  
Mingwu Wang ◽  
Teteso Tobita ◽  
Susumu Iai
Keyword(s):  
Pile Groups ◽  
Soil Layers

Calculation for Settlement of High Cap Extra-Long Large Diameter Pile Groups

2012 ◽  
Vol 178-181 ◽  
pp. 2171-2174
Author(s):  
You Sheng Deng ◽  
Jian Qiang Zheng ◽  
Chang Zhong Wan ◽  
Shao Hua He
Keyword(s):  
Large Diameter ◽  
Highway Bridges ◽  
Additional Stress ◽  
Pile Groups ◽  
Soil Layers ◽  
Elastic Compression ◽  
Stress Solution ◽  
Total Settlement ◽  
Main Bridge

The settlement of high cap extra-long large diameter pile groups is made up of pile elastic compression and settlement of soil layers under pile end in theory. Methods to calculate pile compression of high cap extra-long large diameter pile groups was deduced or listed. Six methods to calculate settlement of soil layers under pile end were expounded through extra-long large diameter pile groups under south tower of main bridge of Sutong Yangtse River Highway Bridges. The results show that piles’ elastic compression should be calculated into the settlement of extra-long large diameter pile groups, including that caused by pile’s own weight, and it is little difference between test value and total settlement which is composed of piles’ elastic compression calculated through the formula deduced in the paper and theoretic settlement of soil layers under pile end based on Mindlin’s additional stress solution, only making 0.06% lower.

FEATURES OF SALTS MIGRATION IN DELTAIC ECOSYSTEMS

1970 ◽  
pp. 28-29
Author(s):  
М. I. Dzhalalova ◽  
P. А. Abdurashidova ◽  
R. М. Zagidova
Keyword(s):  
Cover Crop ◽  
Groundwater Salinity ◽  
Salt Composition ◽  
Material Resource ◽  
Aboveground Phytomass ◽  
Soil Layers ◽  
Material Energy ◽  
Theoretical Foundations ◽  
Pasture Plants ◽  
Salinity Seawater

The coastal strip of the northwestern Caspian is characterized by hydromorphism and salinization processes which depending on the Caspian piled-up water, groundwater salinity, seawater, and salt composition of the underlying rocks. The migrational salts capability in deltoic ecosystem components in dynamic over the main representatives of pasture plants occurring in the Western Caspian and playing an important role in developing the theoretical foundations of a system of measures to increase the productivity of cover crop have studied. Salts migration from soil layers into plants which taking place in synthesis of material-energy and material resource of environment is one of the chains of bio-substrat links. The research results confirm the data that the ash elements stock in the ephemeral-absinthial group varies from 21.5 to 64.5 kg per 1 ha. The organogens prevail in them – 944 kg / ha, K is dominant, then Ca and Mg. The amount of halogens is 7.05 kg / ha, of which Cl portion includes 3.31 and Na – 2.80 kg / ha. In the ephemeral-absinthial group cenoses rather high values of aboveground phytomass are up to 50 centners / ha and the supply of ash elements (halogens 32.14 and organogens 36.18 mg-eq) is much higher compared to their content in soil (7.05 and 6, 31 mg-eq). In roots difference in quantity of organogens and halogens is insignificant – 2.03 and 2.04 mg-eq. We associate such differences with a greater proportion of absinthial in the aboveground phytomass composition

POTENTIALLY TOXIC CHEMICAL ELEMENTS OF SHALE PLAYS – ECOLOGICAL THREAT TO THE ENVIRONMENT

2020 ◽  
Author(s):  
Svetlana Punanova
Keyword(s):  
Chemical Elements ◽  
Organometallic Compounds ◽  
Cost Effective ◽  
Potentially Toxic Elements ◽  
Shale Oil ◽  
Toxic Chemical ◽  
Horizontal Drilling ◽  
Soil Layers ◽  
Valuable Metals ◽  
Economic Use

This research considered the content of trace elements (TE), including potentially toxic elements (PTE) in shale plays and deposits in various regions of the world. Their comparative analysis was carried out and the highest concentrations of PTE in the shales of some regions were revealed. The author notes that the destruction of organometallic compounds occurs during the development of shale hydrocarbon (HC) using horizontal drilling with hydraulic fracturing – injecting large volumes of chemicals while increasing the temperature. During such destruction processes, PTE can escape into the environment: into groundwater, soil layers, and other objects of economic use, and also deteriorate well equipment. In connection with the noted environmental hazards present during the development of shale HC, this paper proposes to monitor the content of TE in both shale rocks as well as in extracted shale oil in order to mitigate the risks of their release into the environment. In addition, developers and scientists should consider the losses of industrially significant volumes of valuable metals that occur due to the lack of cost-effective technologies for their capture and extraction from naphthides.

Sign in / Sign up

Export Citation Format

Share Document