Stability Analysis by Strength Reduction Method in Shallow Buried Tunnels

Abstract

Shallow buried tunnels are commonly seen in engineering practice. To understand the failure mechanism of shallow buried tunnel is of significance in engineering practice. There is a reasonable judging index lacking in tunnel stability. The strength reduction method (SRM) gain limiting status of geotechnical materials by reducing the computation parameters. Then the failure zone can be obtained and showed. Finally, a safety factor can be obtained by this progress. This method has been used in slope stability analysis. The usage of this method is a new field. Based on shallow tunnel computation model under different cover depth, the SRM method is adopted in finding the safety factor of shallow buried tunnels. The displacement curve changing with the strength reduction factor is drawn and the catastrophe point is found as the safety factor. Further, by compared with the failure criteria of plastic zone connection and non-converge, also, compared with model tests, failure mechanism of shallow buried is analyzed. Specialty of these safety factors is discussed and it is proved that they maintain a accordance. This research is of significance for tunnels safety factors' study.

Regression models for estimating ultimate and serviceability limit states of underground rock caverns

“…Consequently, global FS b 1 implies that total collapse has occurred. The technique has been applied to a number of underground excavation problems including rock caverns (Hammah et al, 2007;Zhang and Goh, 2012;Goh and Zhang, 2012) and tunnels (Vermeer et al, 2002;Xia et al, 2014;Wang et al, 2014).…”

Surrounding Rocks Stability Analysis of Circular Tunnel Using Strength Reduction Method and Sliding-t Test

“…The basic principle of SRM could be expressed as the formula following: (1) where is known as the strength reducing factor, and are known as the cohesion and internal friction angle of rock and soil mass. With the increasing of , the slope or tunnel would approach the limit state gradually until reach the failure point [5]. The entire process of SRM could be summarized into the flow chart shown in figure 1.…”

Characteristics of Dynamic Safety Factors during the Construction Process for a Tunnel-Group Metro Station

“…Liang et al [30] used a three-dimensional numerical model and the SRM in order to analyze the influence of triaxial stress states on the failure behavior and the safety factor of deep tunnels. Xia et al [31,32] combined the discontinuous deformation analysis method, the SRM, and the catastrophe theory. They studied the stability of tunnels surrounded by rock.…”

“…At present, the research on tunnel stability mainly focuses on the stability of single tunnels [28,[30][31][32]. Some of them simplify the excavation process and supporting process of the surrounding rock [23,[31][32][33][34][35]. Some of them have not yet unified the criteria for discriminating tunnel stability [29].…”