Stochastic Prediction for Frost Heave Effect of a Subway Tunnel

Abstract

Horizontal freezing induces ground frost heave and ground displacement happens. Excessive uneven displacement or deformation may be dangerous to the surrounding building. The stratum that a Nanjing subway tunnel will traverse through is the soft and silt clay. The artificial freezing construction method is proposed to help the tunnel to traverse through the worse stratum. To control the ground building deformation and displacement due to the ground frost heave, the frost heave effect for the artificial freezing construction should be predicted before the construction process. The stochastic media theory is proposed to predict the frost heave effect due to the artificial freezing construction in the paper. The basic analysis procedure for analyzing frost heave effect is introduced and ground deformations such as ground vertical displacement, ground curvature are analyzed. The analysis result shows that the ground deformation due to the frost heaves is in the limit of ground displacement control requirement.

Analytical Solution of Three-Dimensional Heaving Displacement of Ground Surface during Tunnel Freezing Construction Based on Stochastic Medium Theory

“…Based on the stochastic medium theory and shear displacement method, Zeng and Huang [10] established a calculation model of soil deformation caused by double-O-tube shield tunnel construction. Yang et al [4], Li [11], Tao et al [12], and Zhou et al [13] used stochastic medium theory to analyze the surface frost heaving deformation caused by the freezing method of subway tunnel construction and obtained some meaningful conclusions. However, the common deficiency is that freezing process is not considered in the analysis process.…”