Investigating Effect of Soil Grading Parameters on Tool Wear in Mechanized Tunneling using EPB-TBM Machine

There is no acceptable method for investigating the tool wear phenomenon in soft grounds. In this article, first, a new equipment made at Sahand University of Technology is introduced, which is used for simulation of TBM tunneling mechanism. Next, the effect of various soil grading parameters such as D۱۰, D۳۰, and D۶۰ (which indicate the corresponding diameters on the soil grading diagram where ۱۰, ۳۰, and ۶۰% of the grains are smaller than these values, respectively), coefficient of gradation, uniformity coefficient, sorting coefficient and effective size on the cutting tools wear. The initial studies show that in soils with fine grains greater than ۱۰%, by increase in the values of D۱۰, D۳۰, D۶۰, and effective size, the tool wear increases. However, in soils with fine grains less than ۱۰%, by increase in the above-mentioned parameters, the soil abrasiveness reduces. Also in soils with more than ۱۰% fine grains, by increase in the coefficient of gradation value, the soil abrasiveness reduces. But in soils with fine grains less than ۱۰%, by increase in the value of this parameter, the tool wear increases. The results of experiments show that sorting coefficient could be a good criterion for investigating the soil abrasiveness.

کلیدواژه ها:

Testing & evaluation ، Tunnels & tunnelling ، Geology ، Tool Wear ، Abrasion