Proximity to Existing Tunnel Freezing Method Construction Impact Analysis and Exploration

In order to investigate the influence of freezing method construction on existing tunnels and establish a general deformation prediction method, it is urgent to reveal the mechanism frost heave-structure interaction and quantify its influence. This paper is based on a certain subway project in Foshan City, which uses the freezing method construction of the contact to under the existing subway shield tunnel engineering condition, and uses the three-dimensional finite element numerical simulation method. The deformation influence of freezing on the existing tunnel is analyzed in combination with frost heave effect of soil and the interaction mechanism between tunnel structure. And based on the monitoring data, the analysis model is verified, and the influence prediction model of the freezing method on the upper shield tunnel structure is obtained. The influence of construction on the upper tunnel structure is quantitatively analyzed. Since the frost heave effect is obvious, the performance of the tunnel under large deformation conditions is quantitatively analyzed and calculated, and the deformation control standard is determined. The results of the study show that the numerical simulation method can analyze the influence of the method construction process on the overlying (structural) buildings, and the prediction model has a high degree of fit with the measured data results for the prediction results of the whole process the freezing method construction, with an error of about 2.6%. This study provides a direct quantitative basis for the formulation of deformation control standards and safety assessment in similar engineering.