METHOD FOR PREDICTING EMERGENCY-RESPONSE PIPE-PUSHING THRUST FOR SUBWAY TUNNEL COLLAPSE

摘要

Provided is a method for predicting the thrust of a pipe in pipe-pushing emergency response when a subway tunnel collapses. Comprised are: determining the height H and the severity γ of a collapse, determining the distance H from the center axis of a push pipe to the bottom of a tunnel 1, determining the horizontal length L of a slid-collapsed body at the central axis of the push pipe according to a geophysical prospecting or exploratory drilling method or estimation method; determining the cohesive force c and the internal friction angle φ of the collapsed body; determining the interface friction between the collapsed body and the outer wall of the push pipe ҭ; determining the number of push pipes m and the number of complete pipes n within the range of the horizontal length L; determining the conventional section length L of the incomplete push pipe within the horizontal length L range3 and expanding the head section length L4; determining the thrust T required for the conventional section1, the thrust required for the expansion section T2, and the required thrust T of the cone3; determining the total thrust T required to push the pipe.