Abstract
In the igneous rock area of China, such as Qingdao, Shenzhen, etc, rock is mostly granite or granites gneiss, and the eluvium usually formed from slightly weathered granite is very thin, it is about 20–40m. The pile foundation engineering is always designed as one pile under one column, and most of the piles are designed to be manual hole digging pile with large diameter. During the design calculation, the side friction of the large diameter pile is usually neglected, only the bearing capacity is taken into account, when the settlement is analyzed. It is difficult to account for the effect of the retaining structure of the deep foundation, such as diaphragm wall, row piles, etc.
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