Along with general aspects of TBM Types and TBM selection, on 4th April, 2014 we had a guest lecture from Singapore (Mr. Richard Schulkins) to deliver a lecture on the topic of Soil Conditioning for EPB Tunnelling.
EPB Tunnelling has experienced a great increase in the number of applications and it can be considered the most used technology of the mechanised tunneling in urban area [3,7]. In this lecture, Mr. Schulkins discussed the objectives of Soil conditioning in EPB Tunnelling and the procedure for soil conditioning using various additives.
Click here for a basic presentation on Soil Conditioning by Prof. Peila (ITACET lecture presented in Argentina).
Followed by the lecture, we had a chance to see the experimental setup and witness some tests. Tests on characterisation of conditioned soil is limited and only recently some large scale tests using laboratory screw conveyor has been proposed [5] (details of past studies and tests are included in this reference) and Politecnico di Torino has one of such facilities to test the conditioned soil [1,3,7].
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| Experimental Setup in Politecnico di Torino [3] |
There are five established tests for optimizing the conditioned soil (Foam penetration test, Slump test, shearing test, Compressibility test and friction test) however, during this lab demonstration, quality assessment of the conditioned soil were tested using slump cone test and permeability test. More details about the experimental setup and the test to assess the behaviour of conditioned soil is covered in the paper Peila et al (2009) [2]. Following video shows the demonstration in the Department of Structural Engineering, Construction and Geotechnical, Politecnico di Torino, Italy.
Following video shows the permeability test on the conditioned soil with 10m constant water head. The details of the setup and the test results could be studied in the paper Borio et al (2010) [4].
References:
[1] D. Peila, C. Oggeri, and R. Vinai, “Screw conveyor device for laboratory tests on conditioned soil for EPB tunneling operations,” J. Geotech. Geoenvironmental Eng., vol. 133, no. 12, pp. 1622–1625, 2007.
[2] D. Peila, C. Oggeri, and L. Borio, “Using the slump test to assess the behavior of conditioned soil for EPB tunneling,” Environ. Eng. Geosci., vol. 15, no. 3, pp. 167–174, 2009.
[3] R. Vinai, C. Oggeri, and D. Peila, “Soil conditioning of sand for EPB applications: A laboratory research,” Tunn. Undergr. Sp. Technol., vol. 23, no. 3, pp. 308–317, May 2008.
[4] L. Borio and D. Peila, “Study of the Permeability of Foam Conditioned Soils with Laboratory Tests.,” Am. J. Environ. Sci., vol. 6, no. 4, pp. 365–370, 2010.
[5] L. Borio, D. Peila, C. Oggeri, and S. Pelizza, “Characterization of soil conditioning for mechanized tunnelling .”
[6] Pena. A, “Foam as a soil conditioner in tunnelling : physical and mechanical properties of conditioned sands,” University of Oxford, 2007.
[7] R. Vinai, D. Peila, C. Oggeri, and S. Pelizza, “Laboratory tests for EPB tunnelling soil conditioning,” in Underground Space - the 4th Dimension of Metropolises, 2007, pp. 273–278.
- This lecture was a part of ITACET Training Seminar organised in Politecnico di Torino.
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