According to the statistical analysis of drilling data in Suqian area, the truncated normal distribution function of the bottom elevation of soft clay stratum along the axial direction of the utility tunnel is obtained. Combined with the improved generalized exponential creep constitutive model of different clay soil samples, a stochastic finite element simulation method for the safety prediction of utility tunnel considering the random distribution of stratum thickness and creep characteristics during operation period was established based on the stochastic finite element simulation technology. The results show that the deformation and internal force of Su-qian utility tunnel have stabilized after 10 years of operation. The maximum equivalent stress distribution of the utility tunnel structure is 2.9951-3.4958 MPa, and the maximum value is 16.72％ larger than the minimum one. The probability density of the maximum equivalent stress of the utility tunnel is approximately skewed dis-tribution. The probability density of the maximum tensile stress and the maximum differential settlement of pipe gallery is approximately normal distribution. The spatial variability of the soft soil layer has a certain in-fluence on the safety prediction results of the utility tunnel. The establishment of the reliability prediction method of the utility tunnel considering the spatial variability of the soft soil layer can more comprehensively control the risk, which has important guiding significance for the optimization design and construction safety control of the utility tunnel.
utility tunnelspatial variabilitycreeprandom finite elementtruncated normal distribution
维普
万方数据
