Evaluation Method for Rock Mass Structure Integrity Based on Borehole Multivariate Data

The water inrush of the Shangjiawan karst tunnel is used to study the evolution pattern of precursor water inrush information in water-filled caves and to further reveal the matching mode of the information. The three-dimensional numerical method FLAC3D was used to simulate the evolution process of water inrush after damage to a water-blocking rock mass structure in a water-filled cave and to obtain the evolution pattern of precursor water-inrush information caused by the damage. The results show that the multifield response to the characteristic precursor information of the water-inrush pattern after the fracture of the water-blocking rock mass follows the order of stress-field displacement-field seepage-field. Further, the matching pattern of the information shows that the stress field increased first and then decreased, the displacement field always increased, and the seepage field increased first and then decreased.

Download Full-text

Rock mass structure analysis based on seismic velocity and attenuation images

Chinese Science Bulletin ◽

10.1007/bf02886082 ◽

2000 ◽

Vol 45 (13) ◽

pp. 1211-1216 ◽

Cited By ~ 3

Author(s):

Xu Chang ◽

Yike Liu ◽

Hui Wang ◽

Xing Gao

Keyword(s):

Rock Mass ◽

Structure Analysis ◽

Seismic Velocity ◽

Rock Mass Structure

Download Full-text

Study of Evaluation Method in Terms of Structural Planes Mechanical Characteristics in Engineering Rock Mass

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.384 ◽

2013 ◽

Vol 353-356 ◽

pp. 384-387 ◽

Cited By ~ 1

Author(s):

Mu Dan Guo ◽

Fu Sheng Zhu ◽

Shu Hong Wang ◽

Xi Jiang Mu

Keyword(s):

Rock Mass ◽

Stability Analysis ◽

Efficient Method ◽

Weight Distribution ◽

Evaluation Method ◽

Mechanical Characteristics ◽

Significant Issue ◽

Analytic Hierarchy ◽

Intensity Parameters ◽

Hierarchy Process

Study of mechanical characteristics of structural planes has been significant issue in engineering rock mass stability analysis. The factors that affect the mechanical behavior of structural planes are so complicated that it is quite essential to take an efficient method to quantificationally analyze these factors. Based on the basic principals of analytic hierarchy process (AHP), a structural plane classification method-CSPC method is proposed. It can conduct weight distribution in terms of the complicated factors, assess the structural planes comprehensively and also forecast the planes intensity parameters semiquantitatively. The classification and forecast parameters of structural planes appropriately fit the cases in engineering. Furthermore, the method is easy to master for the engineers and the application can be of great prospect.

Download Full-text

Study of the geometrical size effect of a fractured rock mass based on the modified blockiness evaluation method

Arabian Journal of Geosciences ◽

10.1007/s12517-018-3645-9 ◽

2018 ◽

Vol 11 (11) ◽

Author(s):

Qingfa Chen ◽

Tingchang Yin ◽

Wenjing Niu ◽

Wenshi Zheng ◽

Junguang Liu

Keyword(s):

Rock Mass ◽

Size Effect ◽

Evaluation Method ◽

Fractured Rock ◽

Fractured Rock Mass ◽

Geometrical Size

Download Full-text

Assessment of Weathering Effects on Rock Mass Structure

Jurnal Teknologi ◽

10.11113/jt.v72.2875 ◽

2014 ◽

Vol 72 (1) ◽

Author(s):

Seyed Vahid Alavi Nezhad Khalil Abad ◽

Edy Tonnizam Mohamad ◽

Ibrahim Komoo ◽

Roohollah Kalatehjari

Keyword(s):

Rock Mass ◽

Stereographic Projection ◽

Granitic Rock ◽

Rock Mass Structure ◽

Joint Spacing ◽

Specific Relation ◽

Joint Characteristics ◽

Increasing Trend ◽

Weathering Effects

This paper presents an assessment of weathering effect to the rock mass structure by studying the joint characteristics of tropically weathered granite. Joint survey was performed by scanline method and the results were analyzed statistically by stereographic projection plots. The overall trend of mean joint spacing followed a sharp decrement from fresh to moderately weathered zone and then a slight increment to highly and completely weathered zones, whereas the overall trend of mean joint trace length showed a gradual decrement over progress of weathering. In addition, the degree of joints inclination and weathering zones revealed an increasing trend in the percentage of horizontal joints from fresh to completely weathered rocks, while no specific relation was found between the numbers of major joint set and different weathering zones. The results of this study may contribute to understanding the behavior and better classification of weathered granitic rock mass as a heterogeneous mass in engineering works.

Download Full-text

Joint Investigation and 3D Visual Evaluation of Rock Mass Quality

Advances in Civil Engineering ◽

10.1155/2020/8858322 ◽

2020 ◽

Vol 2020 ◽

pp. 1-16

Author(s):

Haiping Yuan ◽

Chenghao Chen ◽

Yixian Wang ◽

Hanbing Bian ◽

Yan Liu

Keyword(s):

Rock Mass ◽

Quality Evaluation ◽

Evaluation Method ◽

Three Dimensional ◽

Rock Mass Classification ◽

National Standard ◽

Ratio Method ◽

Rock Mass Quality ◽

Close Range ◽

Mass Classification

In order to realize the high efficiency quality classification and three-dimensional visualization of engineering rock mass and to solve the technical difficulties of the traditional rock mass quality evaluation method such as high labor intensity, long process time consumption, many intervention processes such as scale measurement and manual calculation, and nonintuitive classification results, this paper puts forward a 3D visual rock mass quality evaluation method and system based on close-range photography, which optimizes the traditional rock mass quality evaluation method, makes the rock mass classification three-dimensional and visible, and realizes the estimation of unrevealed rock mass quality evaluation index. The research results show the following: (1) The method of storing joint information by close-range photography and extracting joint information by human-computer interaction improves the working efficiency and the process is safe and controllable compared with the traditional method of collecting fracture parameters. (2) Based on the statistical analysis of 97 groups of roadway survey data, the comprehensive statistical regression formula between BQ value of Chinese national standard and RMR value is given, and there is a good correlation between BQ value and RMR value of rock mass quality index. (3) Based on the power-inverse ratio method, the three-dimensional model of rock mass classification of the mine was established, and the cutting model obtained the current distribution diagram of rock mass quality grade, providing scientific reference for drilling, blasting, support, and other production design optimizations.

Download Full-text