ABSTRACT
Swelling rock is a kind of rock mass with significant expansion and softening properties after water absorption. Due to the complex deformation and mechanical mechanism, the underground engineering constructed in swelling grounds is prone to the instability of surrounding rocks and supporting structures. Taking the Lijiaxia diversion tunnel as an object, this study analyzes the geological and disaster conditions in detail. On this basis, the physical and expansion tests of relevant clay rock are carried out. Furthermore, a finite element model is established for the section with prominent deformation, and the expansion and stress characteristics of surrounding rocks during tunnel excavation are revealed. The research has a guiding significance for the construction and deformation control of swelling rock tunnels.
