SHANG Yanjun, WANG Sijing, XUE Jihong, QU Yongxin. 2002: A CASE STUDY ON TBM BLOCK IN MARLS AT CONNECTION WORKS NO.7 TUNNEL OF YELLOW RIVER DIVERSION PROJECT. JOURNAL OF ENGINEERING GEOLOGY, 10(3): 293-298.
    Citation: SHANG Yanjun, WANG Sijing, XUE Jihong, QU Yongxin. 2002: A CASE STUDY ON TBM BLOCK IN MARLS AT CONNECTION WORKS NO.7 TUNNEL OF YELLOW RIVER DIVERSION PROJECT. JOURNAL OF ENGINEERING GEOLOGY, 10(3): 293-298.

    A CASE STUDY ON TBM BLOCK IN MARLS AT CONNECTION WORKS NO.7 TUNNEL OF YELLOW RIVER DIVERSION PROJECT

    • This paper presents a case study on an exceptional event of TBM blocking in a section of the Connection Works No.7 tunnel of Yellow River Diversion Project in China. By analysis of lithology, fold, rock mass strength and geo-stress, it indicates that a high rate deformation with respect to inter-layer shear zone in the lower part of the anticlinal core is a dominant factor resulting in TBM blocking. Also the previously encountered unfavorable conditions in forms of wet clay, groundwater inflow, and cavities are coincident with tensile stress in lower part of the syncline. The syncline and anticline make the fold. Based on these diagnoses, economical and quick curing measurements such as enlargement excavation outside of the shield leaving free space to unlock the TBM were adopted. After 9 days blocking, the TBM was totally released and undertaken normal excavation again. Unlike those frequently encountered and discussed unfavorable geological conditions such as jointed, fractured rock mass and faulted zone, this instance mostly highlights a lesson learnt from folding and inter-layer shear zone in TBM tunneling.
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