Abstract Based on field tests of soil filling pressure calculations for the Shimenshan open-cut tunnel, the open-cut tunnel on Chouxia Line 1 and the Daheng open-cut tunnel, and considering the two structures of bias type cutting and single-pressure type half-cutting, a theoretical conculation formula is derived to obtain a certain number of sample values of uncertain random variable ζ in a calculation model for the typical section position of an open-cut tunnel on a double-track railway. The distribution scheme of random variable ζ is checked by using the A-D method and the statistic characteristics of ζ are obtained, then corrections are made through a statistic uncertainty calculation to obtain the statistic characteristics of the uncertainty ζ of the soil pressure calculation mode. Results show that the mean value of ζ is 1.065 and its variation coefficient is 0.127, complying with the normal distribution. As for the adaptation of this calculation model from single-track open-cut tunnels to double-track railway tunnels, it is of great significance that the revision of the code for tunnel structure design be based on reliability.
Abstract：
Based on field tests of soil filling pressure calculations for the Shimenshan open-cut tunnel, the open-cut tunnel on Chouxia Line 1 and the Daheng open-cut tunnel, and considering the two structures of bias type cutting and single-pressure type half-cutting, a theoretical conculation formula is derived to obtain a certain number of sample values of uncertain random variable ζ in a calculation model for the typical section position of an open-cut tunnel on a double-track railway. The distribution scheme of random variable ζ is checked by using the A-D method and the statistic characteristics of ζ are obtained, then corrections are made through a statistic uncertainty calculation to obtain the statistic characteristics of the uncertainty ζ of the soil pressure calculation mode. Results show that the mean value of ζ is 1.065 and its variation coefficient is 0.127, complying with the normal distribution. As for the adaptation of this calculation model from single-track open-cut tunnels to double-track railway tunnels, it is of great significance that the revision of the code for tunnel structure design be based on reliability.
.Field Tests Regaring the Uncertainty of the Calculation Model for Soil Filling Pressure on Open-Cut Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(2): 128-134
2015, Vol. 52 