scholarly journals Experimental Study of Stress Changes Due to Compaction Grouting

2011 ◽  
Vol 51 (6) ◽  
pp. 1037-1049 ◽  
Author(s):  
Satoshi Nishimura ◽  
Kazuhiro Takehana ◽  
Yoshiyuki Morikawa ◽  
Hidenori Takahashi
Keyword(s):  
Experimental Study ◽  
Compaction Grouting ◽  
Stress Changes

Experimental study of an innovative driven and grouted soil nail (x-Nail)

2020 ◽  
Author(s):  
Mohammad Zahidul Islam Bhuiyan ◽  
Shanyong Wang ◽  
John P. Carter
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Bond Strength ◽  
Innovative Design ◽  
Pullout Force ◽  
Soil Nail ◽  
Compaction Grouting ◽  
Pull Out ◽  
High Bond ◽  
High Bond Strength

This paper describes an experimental investigation of a newly developed driven and grouted soil nail (x-Nail), which combines the capabilities of a purely frictional driven nail and a compaction-grouted nail. The innovative design allows the x-Nail to be driven into the ground with a latex balloon attached that is used subsequently for compaction grouting. A grout bulb is thus formed at the driven end of the nail to improve its pull-out resistance. For compaction grouting, a special type of additive-mixed cement grout was used in this investigation because of its zero bleeding and high bond strength. A series of pullout model tests was conducted to examine the performance of the x-Nail compared to a purely frictional soil nail. It was found that more than 90% of the pullout force of the x-Nail was resisted by the expanded grout bulb and the end bearing resistance of the grout bulb increased with the increment of the injected grout volumes. The experimental results revealed that the pullout force of the x-Nail increased approximately 1800%, 1550%, 1200% and 900% compared to the purely frictional soil nail for the injected grout volumes of about 350 ml, 270 ml, 220 ml, and 170 ml, respectively.

On the imaging of stress changes in particulate media: an experimental study

1994 ◽  
Vol 31 (2) ◽  
pp. 215-222 ◽  
Author(s):  
J.C. Santamarina ◽  
B. Potts
Keyword(s):  
Experimental Study ◽  
Wave Propagation ◽  
Retaining Wall ◽  
Geophysical Methods ◽  
Simulated Data ◽  
The State ◽  
Surface Load ◽  
State Of Stress ◽  
Stress Changes ◽  
Velocity Changes

The stiffness of soils depends on the state of stress. Therefore, the velocity of wave propagation can be used to assess the state of stress and its changes. Indeed, given sufficient data, measurements can be inverted to produce a tomographic image of the stress field. A preliminary study of this approach was conducted with simulated data and is summarized briefly. Results of an experimental study are then presented. Three common geotechnical systems were tested: a footing, a moving surface load, and a retaining wall. Calculated velocity changes are compared with predicted velocity changes, with stress changes being estimated by classical analytical solutions. Good agreement is found in the three cases. The need for accuracy in travel-time measurements, difficulties in tomographic imaging, and the propagation of uncertainty from inverted velocities to stresses are discussed. Key words : geophysical methods, tomography, wave propagation, stress, retaining wall, footings.

Experimental Study and Finite Element Analysis of Concrete Simple Supported Beams Strengthened with Externally Prestressed CFRP Tendons

2013 ◽  
Vol 405-408 ◽  
pp. 1017-1021
Author(s):  
Feng Xu ◽  
Le Huang
Keyword(s):  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Engineering Application ◽  
Finite Element Calculation ◽  
Test Results ◽  
Element Calculation ◽  
Flexural Capacity ◽  
Element Analysis ◽  
Stress Changes

The concrete simple supported beams were strengthened by an innovative device mainly includes oblique screws and linear CFRP tendons. A static experimental study and finite element analysis were conducted to research the flexural capacity and stress changes of CFRP tendons of strengthened beams, and the contrastive analysis was explored between finite element calculation results and test results. The results indicate that the strengthen system can significantly improve the flexural capacity of concrete beams, there is basically a linear relationship between the stress increment of CFRP tendon and the deflection of midspan section, and the finite element calculation value is in agreement with the test results. Based on this, the stress of concrete near holes was analysed using finite element method (FEM), which can provide a reference for practical engineering application.

Experimental Study on an Ideal Compaction Grouting into Sand

2016 ◽  
Author(s):  
Shanyong Wang ◽  
Qiong Wang ◽  
Xinyu Ye ◽  
Scott William Sloan ◽  
Daichao Sheng
Keyword(s):  
Experimental Study ◽  
Compaction Grouting

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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