A method for constructing tunnels with prefabricated linings against dislocation of active faults

Abstract

The invention discloses a construction method for a fabricated lined tunnel resistant to active fault movement. The construction method comprises the steps that A, a tunnel is excavated, specifically,after entering an active fault crossing area in a tunneling mode, the tunnel is blasted and excavated in the active fault crossing area, and segment mounting and synchronous grouting of the fabricated lined tunnel are completed; B, tunnel reinforcing is conducted, specifically, hoisting holes in the centers of all mounted segments are drilled and go deep into surrounding rock outside the segmentsby 30-50 cm, reinforced grouting holes are formed, grouting pipes are screwed into the reinforced grouting holes, and then foam concrete is injected into the surrounding rock through a fracturing grouting method till a circle of closed grout-reinforced area is formed outside a lined circular ring; and C, the grouting pipes are taken out, the reinforced grouting holes are filled with elastic rubber strips, and closing bolts are mounted on the inner sides of the reinforced grouting holes. According to the construction method, the fabricated tunnel can be effectively reinforced, the constructedfabricated tunnel has the high capacity to resist active fault movement, and damage of active fault movement to the tunnel can be effectively relieved or avoided.

Description

technical field [0001] The invention belongs to the technical field of construction of prefabricated lining tunnels. Background technique [0002] Under the complex geological environment of our country, the construction of tunnel engineering will inevitably encounter the problem of crossing active faults and their fracture zones. On the one hand, geological faults are usually filled with mud and groundwater and become weak rock masses. These weak geological faults are widely distributed in the rock mass and constitute the main factor of instability in geotechnical engineering. On the other hand, the fault zone in the active stage is prone to fault dislocation (earthquake), which will cause serious dislocation and vibration damage to the tunnel. When using the mining method to build tunnels, the measures to resist the dislocation of active faults are mainly to take thickening and reinforcement measures for the tunnel lining section or to add a layer of foam concrete between...

AI Technical Summary

Problems solved by technology

This method adopts the working method of soil excavation and segment laying in one, the thickness of the segment is fixed, and it is prefabricated at one time, so it is difficult to take thickening and reinforcement measures; there is no condition to add a layer of foam concrete inside the segment Floor

Therefore, the tunnels built by the existing prefabricated lining methods are difficult to resist the dislocation and vibration damage of active fault dislocation (earthquake)

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