Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Table 4

Relevant parameters of the soil layers surrounding piles.

Soil layer i	Soil types	qsik (kPa)	qpk (kPa)			li (m)
						d = 2.8 m	d = 1.3 m–1.7 m
1	Fine sand	60	—	(0.8/d)^1/3	(0.8/d)^1/3	19	—
2	Fine sand	70	—	(0.8/d)^1/3	(0.8/d)^1/3	9	3
3	Medium-coarse gravel	110	—	(0.8/d)^1/3	(0.8/d)^1/3	12	2
4	Medium-coarse sand	100	—	(0.8/d)^1/3	(0.8/d)^1/3	9	11
5	Medium-coarse gravel	120	—	(0.8/d)^1/3	(0.8/d)^1/3	10	6
6	Fine sand	80	1500	(0.8/d)^1/3	(0.8/d)^1/3	16	13
7	Medium-coarse gravel	120	2600	(0.8/d)^1/3	(0.8/d)^1/3	—	2

Note. The tip resistance of different soil types is the lower limit of the corresponding range in China code [30].