Journal ArticleDOI
Using the Slump Test to Assess the Behavior of Conditioned Soil for EPB Tunneling
TLDR
In this paper, the results of a test program on different conditioned non-cohesive soils using the slump cone test are presented and discussed, and the feasibility of this type of test for the control of EPB conditioned soil has been assessed.Abstract:
In order to extend the application field of Earth Pressure Balance (EPB) tunnel machines to various soil conditions, the soil to be excavated has to be treated with additives in order to modify its mechanical properties, changing it into a plastic paste. Sometimes the grain size distribution is also changed with the use of fine-sized materials. The performance of the conditioned soil should be evaluated with tests that are able to describe its mass behavior, but very little research has been carried out in this field. Often the choice of the conditioning agent set and its control during the excavation is made on a trial-and-error basis during the excavation process. The slump cone test performed on conditioned material is a fast and low-cost way of checking this behavior both in the laboratory and on the job site. The results of a test program on different conditioned non-cohesive soils using the slump cone test are presented and discussed. The influence of the water content and the amount of conditioning foam has been studied, and the feasibility of this type of test for the control of EPB conditioned soil has been assessed.read more
Citations
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Journal ArticleDOI
Assessment method for clay clogging and disintegration of fines in mechanised tunnelling
Fritz Hollmann,Markus Thewes +1 more
TL;DR: In this paper, a new diagram allows for the quantification of changes in the water content and thus, estimating changes in consistency of fine-grained soils under different boundary conditions (availability of water).
Journal ArticleDOI
Laboratory tests on soil conditioning of clayey soil
TL;DR: In this article, a new approach and new devices were proposed to study clay conditioning with laboratory tests, and the results of many tests carried out with the proposed device are presented and discussed.
Journal ArticleDOI
Soil Conditioning for EPB Shield Tunnelling
TL;DR: An overview of the different type of laboratory tests that can be used on cohesionless soils are presented and the most important results that can also be obtained are discussed as mentioned in this paper. But this paper focuses on the use of soil conditioning sets and the choice of the best products to be used.
Journal ArticleDOI
Influence of soil conditioning on ground deformation during longitudinal tunneling
TL;DR: In this paper, the influence of soil conditioning on ground deformation during longitudinal tunneling is investigated, and the results are helpful to determine the conditioned soils and control ground deformations for real constructions.
Micromechanics of granular materials - A tribute to Ching S. Chang Influence of soil conditioning on ground deformation during longitudinal tunneling
Mingjing Jiang,Zhen-Yu Yin +1 more
TL;DR: In this article, the influence of soil conditioning on ground deformation during longitudinal tunneling is investigated, and the results are helpful to determine the conditioned soils and control ground deformations for real constructions.
References
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Journal ArticleDOI
Face stability conditions with earth-pressure-balanced shields
Georg Anagnostou,Kalman Kovári +1 more
TL;DR: In this article, a distinction is made between water-pressure and effective pressure in the chamber, and the stability of the tunnel face is controlled through the combined effects of these two entities.
Book
Mechanised Shield Tunnelling
TL;DR: In this article, the development potential of the mechanised shield tunnelling method is far greater than that of the shotcrete method and other traditional tunnel construction because it is a safer, more effective method of tunnel construction.
Journal ArticleDOI
Soil conditioning of sand for EPB applications: A laboratory research
TL;DR: In this paper, a series of tests have been carried out using a laboratory screw conveyor device which was designed for this purpose and which simulates the extraction of the spoil from a pressure chamber in a similar way as in EPB tunnelling.
Journal ArticleDOI
Use of chemical foam for improvements in drilling by earth-pressure balanced shields in granular soils
S. Quebaud,M. Sibai,J.-P. Henry +2 more
TL;DR: In this paper, the characteristics that must present in the foam and the excavated soil in order to optimize the machine operation have been studied and some simple trials allowing charaterization of the foamed soil (mixture of foam and soil) have also been devised.
Journal ArticleDOI
Screw conveyor device for laboratory tests on conditioned soil for EPB tunneling operations
TL;DR: In this article, a prototype laboratory device is presented and described, which simulates the extraction of the ground from a pressurized tank with a screw conveyor, and the results of a preliminary test program carried out on a medium sized sand show that the prototype device is efficient in verifying the effects of foam for an optimal use in EPB conditioning.
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Use of chemical foam for improvements in drilling by earth-pressure balanced shields in granular soils
S. Quebaud,M. Sibai,J.-P. Henry +2 more