Study on Deformation Mechanism and Control Measures of Soft and Weak Surrounding Rock in Hechuandong Tunnel
With the development of traffic construction,the safe and rapid construction of soft rock tunnel has become the key problem of traffic engineering construction.To explore the deformation mechanism and control technology of soft rock tunnel,with the newly built Hechuandong Tunnel project of Xi'an-Chongqing High-Speed Railway as an example,this paper obtained the deformation mechanism of soft rock tunnel by analyzing the geological characteristics of the tunnel and deformation failure characteristics,and put forward the joint support scheme of'constant resistance long anchor cable+grouting bolt+double-layer initial support'.The field practice results show that after adopting the joint support scheme of 'constant resistance long anchor cable+grouting bolt+double-layer initial support',the maximum settlement of the tunnel vault is 167 mm,the maximum deformation of the arch shoulder is 137 mm,the maximum deformation of the support part is 80 mm,and the large deformation control effect of the surrounding rock is good,which meets the standard requirements.The research results provide the basis and reference for the construction of similar projects at home and abroad.
soft rock tunneldeformation mechanismcontrol technologyjoint support
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