Experimental Study on the Variation Law of Excess Pore Water Pressure at the Bottom of the Foundation Pit for Excavation

Table 2

Natural stress levels of the samples.

No.	Sampling depth (m)	Vertical stress (kPa)	Horizontal stress (kPa)
A1, A2, A3	−4.7	107	63
B1, B2, B3	−12	221	121
C1, C2, C3	−22.8	412	219