Abstract Since the safety and stability of original tunnel structure are easily affected by adjacent foundation pit excavation, it is strongly necessary to study deformation evolution tunnels during excavation. With regard two cases that adjacently located at right bottom pit, influence different supporting methods, including pile support, bolt pile-bolt shotcrete-bolt on was investigated basis...

Abstract An inflatable rockbolt is a steel tube that has been rolled into an omega shape. During installation, water injected the tube, which expands profile of rockbolt, generating radial force against borehole wall. This reinforces rock mass through friction at bolt–rock interface. study aims to quantify effects size, roughness, and installation pressure on pull load capacity bolt. was achiev...

Bolt-ball joints are widely adopted in grid structures due to their high installation accuracy and short construction period. Since the bolt is inside joint, it challenging evaluate its health status from outside structure. A finite-element plane-truss structure model, based on actual structure, was constructed investigate influence of rod’s preload overall stiffness bearing capacity Moreover, ...