深埋高地应力重载铁路隧道基底动力响应分析

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Abstract Research purposes: Under the long-term vibration of heavy-duty trains, the tunnel base structure is prone to cracking and damage. Such diseases are more serious in the base structure of deep-buried tunnels, and may even lead to the uplift and damage of the whole base, which seriously affects the safety of train operation. In order to reveal the dynamic response characteristics of the deep-buried railway tunnel base under the vibration of the heavy-duty train, a dynamic analysis model of the heavy-duty deep-buried railway tunnel was established by means of numerical simulation, and the stress and disease characteristics of the tunnel base structure in this environment were verified. Further combined with the actual project, the disease treatment measures and effects were proposed.
Research conclusions: (1) The base structure of the deep-buried tunnel bears much more than the principal stress value of the shallow-buried tunnel, and it is more likely to suffer from cracks, damage, uplift and other diseases under the cyclic load of the heavy-duty train. (2) Under the action of the heavy-duty train load, the dynamic displacement and dynamic stress of the tunnel base structure gradually decrease with the increase of the thickness of the bottom and the thickness of the invert. (3) Compared with the thickness of the bottom, the increase of the thickness of the invert is more conducive to the control of vertical displacement and stress of the support structure of heavy-haul railway tunnels under the action of cyclic loads, which are less prone to problems such as fatigue cracking. (4) The research results can be applied to the field of the design and disease treatment in deep-buried and heavy-haul railway tunnel.

Key words： deep-buried and high ground stress heavy-haul railway cyclic load dynamic response 1

Received: 26 September 2022

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	HAN Jiang

Cite this article:

HAN Jiang. Dynamic Response Analysis of the Deep-buried and Heavy-haul Railway Tunnel Base with High Ground Stress[J]. Journal of Railway Engineering Society, 2022, 39(12): 73-78.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I12/73

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