Bayesian Approach for Sequential Probabilistic Back Analysis of Uncertain Geomechanical Parameters and Reliability Updating of Tunneling-Induced Ground Settlements

Table 3

Prior statistics of three random variables.

Random variable	Mean (MPa)	Standard deviation (MPa)	COV	Distribution
Young’s modulus of gravel layer, E1	28	4.2	0.15	Lognormal
Young’s modulus of silty clay layer, E2	15	2.25	0.15	Lognormal
Uniform vehicle load, q	10	1.0	0.1	Lognormal