In the beginning, it was thought th

In the beginning, it was thought that the problem was insufficient soil bearing capacity to support the head. However, the bearing capacity analysis proved the soil had enough bearing capacity to support the static MTBM. Analysis of the tunneling in this problematic 15 m section in the fourth drive showed that the head sunk faster when the cutting head was rotated and the slurry systems were operated (the normal operation of the microtunneling process). The very soft and submerged gray fat clay was semi-liquefied and, therefore, failed to support the front portion of the MTBM. The weight of the MTBM was more concentrated at the front where the articulated head which steers the MTBM was located.

Results (English) 1:

In the beginning, it was thought that the problem was insufficient soil bearing capacity to support the head. However, the bearing capacity analysis proved the soil had enough bearing capacity to support the static MTBM. Analysis of the tunneling in this problematic 15 m section in the fourth drive showed that the head sunken faster when the cutting head was rotated and the slurry systems were operated (the normal operation of the microtunneling process). The very soft and submerged gray fat clay was semi-liquefied and, therefore, failed to support the front portion of the MTBM. The weight of the MTBM was more concentrated at the front where the articulated head which steers the MTBM was located.

Results (English) 2:

In the beginning, it was thought the problem was đủ có soil bearing capacity to support the head. Tuy nhiên, the bearing capacity analysis proved the soil bearing capacity to support enough Had the static mTBM. Analysis of the tunneling in this problematic 15 m section in the fourth drive head sunk Faster showed là khi cutting head was rotated and the slurry systems operated là (the normal operation of the microtunneling process). The very soft and clay was submerged gray semi-liquefied fat and, therefore, failed to support the front portion of the mTBM. The weight of the mTBM was at the front where more CONCENTRATED the articulated head mà steers the mTBM was located.