Back Analysis on Mechanical Deformation Parameters of Columnar Jointed Rock Mass

Abstract

The rock mass with polycrystalline aggregates is common geomaterial in civil and architectural engineering as well as hydraulic and hydro-power engineering. For this kind of geometerials, the study on the joint deformation parameters Kn and Ks and the calculation method are not enough so far. Focusing on the rock mechanics and engineering problems of columnar jointed rock mass related to Baihetan hydropower project, analytical models and numerical method based on 3DEC are employed to study the mechanical parameters. The joint deformation parameters Kn and Ks are back analysis using GRNN and the field data of load-bearing plate tests. The application shows that the calculation results are in good accordance with in-situ test results.

A Case Study on Tunnel Excavation Stability of Columnar Jointed Rock Masses with Different Dip Angles in the Baihetan Diversion Tunnel

“…Therefore, this joint model [37,38] was used in this paper, and the schematic diagram of the contact surface constitutive model is shown in Figure 5. According to the geological survey report and related numerical simulation studies of CJRM [25,39], the numerical model parameters are listed in Tables 2 and 3.…”

“…Therefore, this joint model [37,38] was used in this paper, and the schematic diagram of the contact surface constitutive model is shown in Figure 5. According to the geological survey report and related numerical simulation studies of CJRM [25,39], the numerical model parameters are listed in Tables 2 and 3. The irregular CJRM geometric models with different dip angles established in Section 3.2 were imported into the 3DEC software to generate geological numerical models of CJRM.…”