A double shield tbm pipe back support method for rockburst

Abstract

The patent of the present invention discloses a double-shield TBM pipe back support method for dealing with rockbursts, including construction preparation; installation of prefabricated segments; delay time t1, after the unloading of the surrounding rock slows down and the deformation is reduced, pea gravel is carried out. Backfilling; Delay time T, after the stress field and crack development in the bean gravel layer rockburst buffer period are completed, cement grouting is performed; Delay time t1, Bean gravel backfilling is performed after the unloading of the surrounding rock slows down and the deformation decreases; Under the action of rockburst impact load, the complex force chain structure inside the particle breaks and reorganizes. At the same time, the force chain structure extends the instantaneous local impact load in space and time, so as to achieve the effect of absorption and energy consumption, and reduce the impact of rock blocks as much as possible. The influence of ejection impact damage; the delay time T, after the stress field and cracks are basically developed in the bean gravel layer rockburst buffer period, the cement slurry is poured; the consolidated bean gravel layer forms a closed circle to strengthen the support and anti-seepage capabilities of the tunnel , so as to improve the overall construction safety in high ground stress areas.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a double-shield TBM pipe back support method for dealing with rockbursts. Background technique [0002] With the development of major national projects such as Sichuan-Tibet Railway and West-to-East Power Transmission, the tunnel and underground engineering industry is facing more and more deep engineering problems. The problem of deep rock mechanics is most prominent in high ground stress, and its manifestations are rockburst and large deformation. The double-shield TBM (full-face tunnel boring machine) method is widely used in high-in-situ stress areas. Its fully enclosed environment can effectively prevent the occurrence of rock mass spalling, ejection, and even strong avalanche after strong unloading of the surrounding rock in high-in-situ stress tunnels. The danger of rockburst to personnel and equipment ensures the safety of tunnel construction. In...

AI Technical Summary

Problems solved by technology

According to the traditional construction method, immediately after the dredging and filling of the bean gravel, the grouting is performed synchronously, and the slurry and the bean gravel are consolidated within a few hours to form a rigid body structure. When the surrounding rock continues to release elastic energy, the rigid support structure is prone to brittle failure, thus cause quality safety accidents

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