Geometrical characteristic investigation of the Baihetan irregular columnar jointed basalt and corresponding numerical reconstruction method

Zhang, Jian-cong; Jiang, Quan; Feng, Guang-Liang; Li, Shaojun; He, Ben‐Guo

doi:10.1007/s11771-022-4940-x

Cited by 12 publications

(4 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To fully utilize the geological statistical parameters and establish a geometric model that better simulates the CJRM geological features for tunnel excavation simulation, this paper adopted the CJRM geometric model reconstruction method proposed by Zhu et al [32] to generate the geometric model. The geological statistical geometric parameters of the left bank diversion tunnel [26,33,34] are shown in Table 1. Since there are fewer transverse joints compared to the densely distributed columnar jointed network in the Baihetan basalts, which has little effect, and accurate geological statistical parameters are difficult to obtain, the transverse joint connectivity rate was set to 0.…”

Section: Construction Of Cjrm Geometric Model With Geological Parametersmentioning

confidence: 99%

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

Wang

Zhu

et al. 2023

Symmetry

View full text Add to dashboard Cite

Columnar jointed rock mass (CJRM) formed by intact rock divided by special symmetrical columnar joints is a special type of rock with poor mechanical properties, strong anisotropy, and weak self-supporting ability, severely affecting the excavation safety and stability of underground tunnels. In this study, taking the Baihetan hydropower station as the engineering background, CJRM geological numerical models with different dip angles that combined well with the natural CJRM were generated based on the geological statistical parameters of the engineering site and were verified to have high rationality and accuracy. Tunnel excavation and overloading tests were carried out on these numerical models, and the results showed that the stress and displacement distributions after excavation exhibited strong anisotropic characteristics under different dip angles, and the positions where engineering safety problems are most likely to occur are the side walls, which are prone to stress-structure-controlled failure mode. The self-supporting ability at different dip angles after excavation from weak to strong are 45°, 60°, 75°, 90°, 30°, 0°, and 15°. The safety factors assessed by overloading for CJRM with dip angles of 0–90° degrees were 2.5, 2.6, 2.6, 1.8, 2.1, and 2.2, respectively, providing a valuable reference for the construction safety and support measures of CJRM excavation.

show abstract

Section: Construction Of Cjrm Geometric Model With Geological Parametersmentioning

confidence: 99%

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

Wang

Zhu

et al. 2023

Symmetry

View full text Add to dashboard Cite

show abstract

“…Structural planes such as joints, fissures and faults are common in rock materials (Saliba and Jagla, 2003;Li et al, 2021;Zhang et al, 2022). The structural plane is the most important factor in controlling the deformation, strength and permeability of the surrounding rock of the tunnel (Smith and Holden, 2021;Cai et al, 2022a;Guo et al, 2023a;Xu et al, 2024;Lu et al, 2024).…”

Section: Introductionmentioning

confidence: 99%

Investigation on the failure mechanism of the collapse of the columnar jointed basalt in underground cavern

Zhao,

Zhang,

Pei

et al. 2024

Front. Earth Sci.

Self Cite

View full text Add to dashboard Cite

Columnar jointed basalt (CJB) is a kind of jointed rock with a polygonal cylinder mosaic structure that has complex mechanical properties such as discontinuity and heterogeneity. The typical geological structure of the CJB is the intercolumnar joint plane and the implicit joint plane, which obviously affect the mechanical properties of the rock mass. Controlling the unloading relaxation of the CJB is a key problem during the construction of underground engineering. In this paper, in-situ acoustic wave and panoramic borehole camera measurements were carried out in the cavern of the Baihetan project to understand the failure mechanism of the collapse of the CJB. It was quite clear that the evolution of the excavation damage zone (EDZ) of the CJB depends on the time and spatial effects. The closer to the collapse zone, the greater the degree of relaxation failure of the columnar joint rock mass; the further away from the cavern perimeter, the more stable the surrounding rock. The correction between wave velocity and cracks in the rock mass was also discussed. This field test and theoretical analysis can provide a reference for studying the failure mechanism and control measures of CJB in underground caverns under high geostress.

show abstract

“…Alternatively, the Voronoi diagram has long been used for representing material microstructures (e.g. Abbruzzese et al ., 1992; Malan and Napier, 1995; Zhang et al ., 2022) since it was defined by Voronoi (1908). The development and applications of the Voronoi diagram are comprehensively reviewed in Dobrin (2005).…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of granite microstructure model using simulated annealing method and Voronoi tessellation

Chen

Wang

Cui

et al. 2023

View full text Add to dashboard Cite

PurposeAccurate presentation of the rock microstructure is critical to the grain-scale analysis of rock deformation and failure in numerical modelling. 3D granite microstructure modelling has only been used in limited studies with the mineral pattern often remaining poorly constructed. In this study, the authors developed a new approach for generating 2D and 3D granite microstructure models from a 2D image by combining a heterogeneous material reconstruction method (simulated annealing method) with Voronoi tessellation.Design/methodology/approachMore specifically, the stochastic information in the 2D image is first extracted using the two-point correlation function (TPCF). Then an initial 2D or 3D Voronoi diagram with a random distribution of the minerals is generated and optimised using a simulated annealing method until the corresponding TPCF is consistent with that in the 2D image. The generated microstructure model accurately inherits the stochastic information (e.g. volume fraction and mineral pattern) from the 2D image. Lastly, the authors compared the topological characteristics and mechanical properties of the 2D and 3D reconstructed microstructure models with the model obtained by direct mapping from the 2D image of a real rock sample.FindingsThe good agreements between the mapped and reconstructed models indicate the accuracy of the reconstructed microstructure models on topological characteristics and mechanical properties.Originality/valueThe newly developed reconstruction method successfully transfers the mineral pattern from a granite sample into the 2D and 3D Voronoi-based microstructure models ready for use in grain-scale modelling.

show abstract

Geometrical characteristic investigation of the Baihetan irregular columnar jointed basalt and corresponding numerical reconstruction method

Cited by 12 publications

References 37 publications

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

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

Investigation on the failure mechanism of the collapse of the columnar jointed basalt in underground cavern

Reconstruction of granite microstructure model using simulated annealing method and Voronoi tessellation

Contact Info

Product

Resources

About