A Case Study on the Deformation of Metro Foundation Pit in Silt Stratum in North China

Table 3

The energy increment of each step.

Items	Construction steps
	2	3	4	5
∆P (J/m)	4.21	9.425	38.745	53.82
∆W (J/m)	3.95	9.005	35.24	52.775
∆U (J/m)	0.26	0.06	0.075	0.035
∆V (J/m)	0	0.365	3.43	1.01
∆U/∆P (%)	3.09	0.32	0.095	0.035
∆V/∆P (%)	0	1.935	4.425	0.94