In fact the construction of bored piles at the PDA experiment here, contractors found digging area appears from 2 sides drain into and cause avalanche pits dug. So the contractor has established measures and conduct observation of this area water tracking, the highest water levels of up to + 6.33 (the bottom of the pedestal is + 5,192) is higher than the bottom of the nail hole 1,138 m. With the water level in Foundation pit construction measures, like on the train was not able to perform, so the proposed contractor switched to training measures the enclosure frame (Board track water level see annex 1).
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