Construction method for high-speed railway double-track tunnel penetrating through vertical mud gushing karst cave

Abstract

The invention relates to a construction method for a high-speed railway double-track tunnel penetrating through a vertical mud gushing karst cave. According to a reinforcing system, through the structures of a protective arch, a concrete layer, a flexible buffer layer and a protective layer at the top of the tunnel at the karst cave, the problems that mud is not poured downwards from the top, and water is prevented can be solved, and through the structures of an anchor cable, a ring beam and a foundation cushion layer at the bottom of the tunnel, the problem that mud is not gushed upwards can be solved; and three arch bridges are erected in the middle, bearing vertical walls are additionally arranged under the arch bridges, the stability of the arch bridges is ensured, ballastless tracks are safely laid on the bridges, and the railway safely passes through the mud gushing karst cave.

Description

technical field [0001] The invention relates to the technical field of tunnel subsidence construction, in particular to a construction method when a high-speed railway double-track tunnel passes through a vertical mud gushing karst cave. Background technique [0002] Tunnels often pass through karst geology when they are built. Since karst morphological features mainly include karst ditches, underground rivers, and karst caves, when building tunnels, it is easy to cause ground subsidence and surface subsidence caused by water gushing or mud inrush, such as tunnel holes. Surface subsidence often occurs at the top to form potholes. The traditional method is to clean up all the gushing fillings, build arch protection at the arch, fill with thick river sand, and use it as a buffer layer; dissolve the cavity at the bottom of the tunnel Bored piles are constructed, abutments are laid, cast-in-place prefabricated simply supported beams are constructed, and ballastless tracks are co...

AI Technical Summary

Problems solved by technology

[0003] However, due to the problem of falling blocks on the top of the cave and water leakage along the cracks during rainy periods, the sand filling has limited anti-buffering capacity and is prone to water accumulation; at the bottom of the tunnel, since the outside of the cave is limestone, non-blasting excavation is very difficult, and blasting Excavation not only causes damage to the rock, but is prone to landslide hazards; it also disturbs the solution cavity to generate mud gushing, causing potential safety hazards

The construction period of the pile foundation, cap, and simply supported beam bridge is long, especially the depth of the pile foundation is too large, exceeding 70 meters, and the construction in the tunnel is very difficult, and the completed pile foundation, cap, Simply supported beams, whose settlement and convergence observation time is long, it is difficult to meet the construction schedule

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