Analysis of Long-term Stability of Soft Rock Tunnel under High Geostress
Research purposes:The soft rock under high geostress shows obvious property of rheology characteristic.Rock mass parameters change with time during rheological process.The paper considers the design and construction plan of the Liangwangshan Tunnel,and uses the Cvisc model to analyze the stress and deformation of the surrounding rock during its construction process and operation period.It identifies the stress,strain,and deformation characteristics of the tunnel during the construction and long-term operation stages,as well as the development law of the internal force and deformation of the tunnel support structure over time.Research conclusions:(1)During soft rock tunnel construction,the arch foot of the initial support should be appropriately reinforced to control the deformation.(2)It is not only necessary to ensure the safety during the construction period,but also to pay attention to the long-term stability of the tunnel during the later operation process.(3)The stiffness of the support structure needs to be designed based on the rheological stability state of the surrounding rock throughout the entire life cycle,to ensure the tunnel structure long-term stability.(4)The research results can provide a reference for the safe construction and long-term stability research of soft rock tunnel under high geostress.
soft rock tunnellong-term stabilityrheologicalhigh geostressnumerical simulation
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