Specifications

Issue date: July 2013
Publication year: 2013
Pages: 68-75
Language: Chinese
ISSN: 10004548
CODEN: YGXUEB
Document type: Journal article (JA)
Publisher: Chinese Society of Civil Engineering, 34 Hujuguan, Nanjing, 210024, China
Abstract: The loess is structural and unsaturated. Direct shear tests on intact loess and remold
loess are firstly carried out by controlling the matric suction of unsaturated soil. Then the effect
of the matric suction on the net stress strength index, parameter φb in the Fredlund shear
strength formula and parameter χ in the Bishop effective stress formula of unsaturated soil is
analyzed respectively. The experimental results show that net stress strength index increases with
the increasing matric suction, φb and χ decreases with the increasing matric suction, and under
the same matric suction, the net stress strength index, φb and χ of the intact loess are all larger
than those of the remold loess. Besides, the unconfined compressive strengths of the intact loess,
remold loess and saturated loess are measured by means of the single axial compression
instrument. According to the definition of structural indices, the structural index of intact loess
and remold loess with different water contents are obtained based on the unconfined
compressive strength. Finally, the relationship among the net stress strength index and
parameters φb, χ and structural index is also explored. The values of φb and χ unsaturated loess
have the monotonic variation with the structural index. Under the same configuration conditions,
the values of φb and χ of the intact loess are greater than those of the remolded loess, which
reflects the differences in structural traits of the two types of unsaturated soil.
Number of references: 7
Main heading: Sediments
Controlled terms: Compressive strength - Indexing (materials working) - Shear strength
- Soils
Uncontrolled terms: Different water contents - Experimental research - Loess -
Matric suctions - Strength - Strength characteristics - Unconfined compressive
strength - Unsaturated soil
Classification code: 421 Strength of Building Materials; Mechanical Properties - 483 Soil
Mechanics and Foundations - 483.1 Soils and Soil Mechanics - 603.2 Machine Tool
Accessories
Database: Compendex
Compilation and indexing terms, © 2013 Elsevier Inc.
8.
Accession number: 20133416649888
Title: Adaptive backstepping control of pneumatic servo system
Authors: Ren, Hai-Peng1 ; Huang, Chao1/任海鹏;黄超
Author affiliation: 1 Department of Information and Control Engineering, Xi'An University of
Technology, Xi'an, China
Source title: IEEE International Symposium on Industrial Electronics
Abbreviated source title: IEEE Int Symp Ind Electron