Mechanical Properties of Resin-grouted Bolting under Thermodynamic Effect

Abstract

Received: 18 August 2018 Accepted: 22 November 2018 Considering the complex thermodynamic conditions in the surrounding rock of actual tunnels, this paper attempts to disclose the mechanical properties of resin-grouted bolting system under thermodynamic effect. Firstly, the mechanical properties and failure mechanism of resingrouted bolts are examined, and the bolt-rock interaction mechanism was investigated under thermodynamic effect. On this basis, the anchoring parameters were designed under the thermodynamic effect. The results show that the failure surface of a bolt is either made of logarithmic spirals or straight lines; the elastic modulus of the bolting system is negatively linear with the temperature, while the Poisson’s ratio and thermal expansion factor are positively linear with the temperature; under the constant load of 30 MPa, the yield stress of the rock sample was 87με, 95με, 105με and 133με at 20 °C, 40 °C, 60 °C and 80 °C, respectively; under the ideal conditions, the resin-grouted bolting system can fully offset the displacement of the surrounding rock. The research findings lay the theoretical and empirical basis for the application of resin-grouted bolting systemin deep rock masses.