Application Research Of 3D Digital Evaluation And Analysis Method In Geological Engineering

In order to adapt to the construction and development of informatization and digitization of engineering survey industry, a method of rock mass quality classification based on 3D geological modeling analysis is proposed. Based on a hydropower station as an example, this paper build a refinement 3D geological visualization model, simulate and analysis engineering geology of the hydropower station from the perspective of the three-dimensional digital. According to features of rock mass damage and elastic-plastic mechanics of dissipation energy principle, which gives the optimize evaluation index and method of rock mass quality classification in water resources and hydropower engineering, endowed with classification attribute values of each level and restructured model shows the spatial distribution characteristics of rock mass quality. In conclusion, this method improves the efficiency and intuitiveness of the engineering geology analysis and engineering rock mass quality classification. Furthermore, the 3D digital evaluation method was verified more rationality and intuitiveness in geological engineering comparing with traditional 2D geological analysis method.

Integration of homogeneous structural region identification and rock mass quality classification

In rock engineering projects, professionals assess the overall rock mass qualities using a sole value. However, the true qualities of partial rock masses are incompatible with such a value. To address this problem, the idea of regionally classifying rock mass qualities is proposed and the associated procedure presented. To achieve this goal, the probabilistic and deterministic joints within the study area were determined, and a three-dimensional joint network model was created. Then, the three-dimensional joint network model was discretized into interlocking subdomains, and the modified blockiness index ( MB i ) was used to finely identify the homogeneous structural regions, together with the k -means algorithm and the sum of squared errors (SSE). A synthetic model comprising homogeneous structural regions was developed and validated with respect to the extracted cross-sections. Next, an improved rock mass rating system ( RMR mbi ) was introduced, and the viability of RMR mbi was supported through a significant amount of theoretical cases and several real cases. Finally, visualization of regional RMR mbi classification results was performed. Results show that: (i) the homogeneous structural regions are finely demarcated in three dimensions, and (ii) the proposed idea can overcome the problem of rock mass quality classification using the conventional approach often leading to ‘overgeneralization’.

Control Function of Corrosion of Calcareous Sandstone over Rock Mass Quality in One Hydroelectric Station on the Jinsha River

The hydro-electrical power station is planned to be built on the Jinsha River. The regional geologic structure is complex. On the basis of the geological engineering conditions and rock mass quality classification, the change of wave velocity of rock mass is used to analyze systematically the control function of corrosion of calcareous sandstone over rock mass quality. The modificatory standard of rock mass quality classification and the system of rock mass quality classification in the hydroelectric station have been carried out. The main results can be taken as the basic data and the theoretical proofs to evaluate the engineering rock mass stability.