Assessment of Weathering Effects on Rock Mass Structure

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.

Present Situation and Consideration of Rock Burst Hazard

2011 ◽  
Vol 250-253 ◽  
pp. 136-147 ◽  
Author(s):  
Lin Deng ◽  
Yan Lv ◽  
Rong Gui Deng
Keyword(s):  
Rock Mass ◽  
Present Situation ◽  
Mathematical Explanation ◽  
Underground Space ◽  
Rock Mass Structure ◽  
Attribute Weights ◽  
Practical Project ◽  
Intensity Classification ◽  
Full Consideration

Rockburst is a sudden disaster that endangers greatly the security of operators and facilities in the production.The problem of rockburst is the most important issues in the underground space. This paper describes the present situation of the disaster at home and abroad ,which includes the conception，classification, intensity classification, mechanism, forecasting, and prenvention. Based on these analysis, This paper summarizes the following questions：Conception and intensity classification of rockburst has not level , its major and minor influencing factors has not compartmentalized; without taking full consideration in the influence of rock mass structure and dynamic action in comprehensive prediction, and there are fewer considerations of it in practical project; Attribute weights of all the factors are always subjectivity, it can not give the mathematical explanation; Study on rockburst mechanism are not enough, It can not exactly prodict when and where occur,can not raise the perfect time to prenvent the disasters.At the end of this paper, it is pointed out that it is the emphasis topic which comprehensive prediction with computer.

scholarly journals Evolution Pattern and Matching Mode of Precursor Information about Water Inrush in a Karst Tunnel

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1579
Author(s):  
Jie Song ◽  
Diyang Chen ◽  
Jing Wang ◽  
Yufeng Bi ◽  
Shang Liu ◽  
...  
Keyword(s):  
Rock Mass ◽  
Stress Field ◽  
Displacement Field ◽  
Water Inrush ◽  
Seepage Field ◽  
Karst Tunnel ◽  
Rock Mass Structure ◽  
Evolution Pattern ◽  
Water Blocking ◽  
Precursor Information

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.

Rock mass structure analysis based on seismic velocity and attenuation images

2000 ◽  
Vol 45 (13) ◽  
pp. 1211-1216 ◽  
Author(s):  
Xu Chang ◽  
Yike Liu ◽  
Hui Wang ◽  
Xing Gao
Keyword(s):  
Rock Mass ◽  
Structure Analysis ◽  
Seismic Velocity ◽  
Rock Mass Structure

Analysis of TBM Tunnel Behavior in Jointed Rock Mass

2011 ◽  
Vol 90-93 ◽  
pp. 2033-2036 ◽  
Author(s):  
Jin Shan Sun ◽  
Hong Jun Guo ◽  
Wen Bo Lu ◽  
Qing Hui Jiang
Keyword(s):  
Rock Mass ◽  
Numerical Models ◽  
Jointed Rock ◽  
In Situ Stress ◽  
Jointed Rock Mass ◽  
Joint Orientation ◽  
Joint Spacing ◽  
Factors Affecting ◽  
Dip Angle

The factors affecting the TBM tunnel behavior in jointed rock mass is investigated. In the numerical models the concrete segment lining of TBM tunnel is concerned, which is simulated as a tube neglecting the segment joint. And the TBM tunnel construction process is simulate considering the excavation and installing of the segment linings. Some cases are analyzed with different joint orientation, joint spacing, joint strength and tunnel depth. The results show that the shape and areas of loosing zones of the tunnel are influenced by the parameters of joint sets and in-situ stress significantly, such as dip angle, spacing, strength, and the in-situ stress statement. And the stress and deformation of the tunnel lining are influenced by the parameters of joint sets and in-situ stress, too.

SEISMIC CLASSIFICATION OF ROCK MASS QUALITIES*

1979 ◽  
Vol 27 (2) ◽  
pp. 409-442 ◽  
Author(s):  
B. SJOGREN ◽  
A. OFSTHUS ◽  
J. SANDBERG
Keyword(s):  
Rock Mass

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

2022 ◽  
Vol 22 (1) ◽  
Author(s):  
Jinchao Wang ◽  
Hanhua Xu ◽  
Wei Chen ◽  
Chuanying Wang ◽  
Zengqiang Han
Keyword(s):  
Rock Mass ◽  
Evaluation Method ◽  
Multivariate Data ◽  
Rock Mass Structure

Stability Analysis and Control Measures of the Kim-Yun-Mine Collapse

2012 ◽  
Vol 594-597 ◽  
pp. 358-361
Author(s):  
Shan Shan Zhang ◽  
Yu Liang Wu
Keyword(s):  
Rock Mass ◽  
Stability Analysis ◽  
Stereographic Projection ◽  
Control Measures ◽  
Collapse Characteristics ◽  
Basic Characteristics ◽  
The Stability ◽  
Mine Collapse ◽  
And Control ◽  
Dangerous Rock Mass

Collapse is one of the major geological disasters all over the world and threats to life and property safety of people. To make a better understanding of the reason it occurs and how to deal with it, the Kim-Yun-Mine collapse is researched. There are one dangerous rock mass and two collapse accumulation body. The basic characteristics of the collapse is described clearly according to the geological exploration data, and the stability of the dangerous rock mass and the collapse accumulated body is analyzed in the way of engineering geology and stereographic projection. At last, we put forward comprehensive control measures based on the results of stability analysis and collapse characteristics.

Rock mass structure

1999 ◽  
pp. 48-86
Author(s):  
B. H. G. Brady ◽  
E. T. Brown
Keyword(s):  
Rock Mass ◽  
Rock Mass Structure
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