scholarly journals THE FACTORS EFFECT THE STRENGTH OF MIXING COLUMN

2009 ◽  
Vol 12 (5) ◽  
pp. 90-100
Author(s):  
Ngo Van Dau
Keyword(s):  
Soil Improvement ◽  
Soil Mixing ◽  
Column Method ◽  
East West

Basing on collecting and classifying the researches in soil mixing column method, and applying soil mixing column method at Sai Gon East West highway, this article wants to state and analysis the factors that effect strength and stability of mixing column. It also has some comments of applying this method in soil improvement.

Full-Scale Seismic Testing of Piles in Improved and Unimproved Soft Clay

2016 ◽  
Vol 32 (1) ◽  
pp. 239-265 ◽  
Author(s):  
Bradley J. Fleming ◽  
Sri Sritharan ◽  
Gerald A. Miller ◽  
Kanthasamy K. Muraleetharan
Keyword(s):  
Low Cycle Fatigue ◽  
Damping Ratio ◽  
Soft Clay ◽  
Soil Improvement ◽  
Elastic Stiffness ◽  
Field Investigation ◽  
Full Scale ◽  
Deep Soil ◽  
Soil Mixing ◽  
Head Displacement

A full-scale field investigation was performed to determine the effects of soil improvement on the seismic resistance of piles in soft clay. A soil improvement method, called cement deep soil mixing (CDSM), was used to improve soil supporting a standard 324 mm diameter steel pipe pile subjected to simulated earthquake lateral loads. An identical pile in unimproved clay was also tested to determine the effects of the soil improvement. Compared to the unimproved pile, the CDSM technique showed a 42% increase in pile lateral strength, a 600% increase in effective elastic stiffness, and a 650% increase in average equivalent damping ratio. The pile in improved soil reached its lateral capacity at a head displacement of 0.1 m, at which point the critical region at the base of the pile above the improved ground experienced buckling and subsequent fracture due to low cycle fatigue.

A CASE STUDY ON SOIL IMPROVEMENT WITH DEEP SOIL MIXING APPLICATION

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
M. Inanc Onur ◽  
H. Orkun Kilic ◽  
Mustafa Tuncan ◽  
Ahmet Tuncan
Keyword(s):  
Soil Improvement ◽  
Load Test ◽  
Soil Parameters ◽  
Treatment Technology ◽  
Deep Soil ◽  
Soil Mixing ◽  
Core Samples ◽  
Application Procedure ◽  
Deep Soil Mixing

Soil improvement is defined as the improvement of the some soil parameters by using different methods when the soil properties are insufficient to prevent static and dynamic loads. The Deep Soil Mixing (DSM) is an in situ soil treatment technology whereby the soil is blended with cementitious and/or other materials. The method has gained its popularity after 1990’s in the world and last ten years in Turkey. In this study, a case study on soil improvement with deep soil mixing application in Eskisehir, Turkey is presented. The application procedure was created according to steps of usual geotechnical projects. Firstly, soil investigation was done and soil parameters were defined. And then, bearing capacity of deep soil mixing columns was calculated and modelled by “All Pile” software. After the site application, core samples were taken and the load test was applied to the core samples. Finally, deep soil mixing is becoming a popular as a soil improvement method and gives succeeding results.

Values and intergroup perceptions of East Germans and West Germans in 1998 1This research was supported by a grant from the German Research Society (We 1106/3-1).

1999 ◽  
Vol 58 (4) ◽  
pp. 263-272
Author(s):  
Jörg Doll ◽  
Michael Dick
Keyword(s):  
Research Society ◽  
Frame Of Reference ◽  
Control Group ◽  
Perceived Similarity ◽  
The West ◽  
Need For Uniqueness ◽  
German Research ◽  
East German ◽  
Experimental Group ◽  
East West

The studies reported here focus on similarities and dissimilarities between the terminal value hierarchies ( Rokeach, 1973 ) ascribed to different groups ( Schwartz & Struch, 1990 ). In Study 1, n = 65 East Germans and n = 110 West Germans mutually assess the respective ingroup and outgroup. In this intra-German comparison the West Germans, with a mean intraindividual correlation of rho = 0.609, perceive a significantly greater East-West similarity between the group-related value hierarchies than the East Germans, with a mean rho = 0.400. Study 2 gives East German subjects either a Swiss (n = 58) or Polish (n = 59) frame of reference in the comparison between the categories German and East German. Whereas the Swiss frame of reference should arouse a need for uniqueness, the Polish frame of reference should arouse a need for similarity. In accordance with expectations, the Swiss frame of reference significantly reduces the correlative similarity between German and East German from a mean rho = 0.703 in a control group (n = 59) to a mean rho = 0.518 in the experimental group. Contrary to expectations, the Polish frame of reference does not lead to an increase in perceived similarity (mean rho = 0.712).

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