Study on active support method and control effect of NPR anchor cables for large deformation of tunnel surrounding rock under complex geological conditions
Tunnel engineering faces complex geological conditions in the construction process,and the surrounding rock large deformation disasters cause many economic losses and personnel safety threats.Given the challenging issue of controlling the large deformation disaster of tunnel surrounding rock under complex geological conditions,firstly,based on the excavation compensation method,it is presented that the active support method with high support force effectively controls the large deformation of surrounding rock by the rock mechanics method.Secondly,in response to the demand for high support force active support methods for high-performance new materials,multi-generation NPR(negative Poisson's ratio)materials with high constant resistance and large deformation characteristics developed by our team are introduced.Finally,the active support method with NPR new material as the core is introduced in engineering applications to control large deformation disasters of tunnel surrounding rock under complex geological conditions.The results indicate that:(1)Large deformation in the tunnel surrounding rock is mainly caused by the redistribution of stress resulting from tunnel excavation,and active support can provide support force to restore or approach the initial stress state.(2)Unlike traditional materials,the NPR new material developed by our team can provide high support force for deep surrounding rock to restore the original stress state.(3)Based on the analysis of engineering cases,the NPR active support technology has demonstrated effective control of large deformations in soft rock tunnels,fault-fracture zone tunnels,and rock burst tunnels,providing a reference and practical basis for dealing with large deformations in complex geological conditions.
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