In spite of the many advantages offered by micro-tunnelling, significant problems of a technical nature can be encountered when the excavation machine tends to sink under its weight in poor sandy–silty soils and there is deviation from the theoretical advancement direction. This work presents a new calculation procedure that is able to evaluate the settlements and rotations of a Microtunnel Boring Machine (MTBM) and, therefore, to signal the danger of sinking of the excavation machine. The procedure involves the combined use of the hyperstatic reaction method (with a Winkler approach) and of a finite difference numerical method. A parametric study developed with the proposed procedure for poor grounds, from the geotechnical point of view, has led to useful indications on the courses of action to take (integrative structural works or ground reinforcement) when it is possible that the phenomenon of machine sinking could occur
Analysis of the problems connected to the sinking of microTBMs in difficult grounds / Oreste, Pierpaolo; Peila, Daniele; Marchionni, V; Sterling, R.. - In: TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY. - ISSN 0886-7798. - STAMPA. - 16:supp. 1(2001), pp. S33-S45. [10.1016/S0886-7798(02)00064-0]
Analysis of the problems connected to the sinking of microTBMs in difficult grounds
ORESTE, PIERPAOLO;PEILA, Daniele;
2001
Abstract
In spite of the many advantages offered by micro-tunnelling, significant problems of a technical nature can be encountered when the excavation machine tends to sink under its weight in poor sandy–silty soils and there is deviation from the theoretical advancement direction. This work presents a new calculation procedure that is able to evaluate the settlements and rotations of a Microtunnel Boring Machine (MTBM) and, therefore, to signal the danger of sinking of the excavation machine. The procedure involves the combined use of the hyperstatic reaction method (with a Winkler approach) and of a finite difference numerical method. A parametric study developed with the proposed procedure for poor grounds, from the geotechnical point of view, has led to useful indications on the courses of action to take (integrative structural works or ground reinforcement) when it is possible that the phenomenon of machine sinking could occurPubblicazioni consigliate
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https://hdl.handle.net/11583/1405358
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