scholarly journals Study on Mechanical Problems of Complex Rock Mass by Composite Material Micromechanics Methods: A Literature Review

2022 ◽  
Vol 9 ◽  
Author(s):  
Junzhao He ◽  
Yunan Li ◽  
Yuling Jin ◽  
Anming Wang ◽  
Yumin Zhang ◽  
...  
Keyword(s):  
Composite Material ◽  
Rock Mass ◽  
Structural Similarity ◽  
Jointed Rock ◽  
Mechanical Analysis ◽  
Difficult Problem ◽  
Homogenization Method ◽  
Consistent Model ◽  
Practical Engineering ◽  
Layered Rock Mass

The mechanical analysis of complex rock mass is a difficult problem, which often occurs in scientific research and practical engineering. Many achievements have been made in the study of rock mass composite problems by composite material micromechanics method, but it has not been well summarized so far. This paper summarizes in detail the research status of complex rock mass problems by composite material micromechanics method at home and abroad, including the application of the Eshelby equivalent inclusion theory and self-consistent model in rock mass composite problems, and the application of the homogenization method in jointed rock mass and other rock mass composite problems such as anchored rock mass, layered rock mass, and salt rock mass with impurities. It is proposed that the structural similarity and mechanical analysis similarity should be satisfied when the composite material micromechanics method is used to study the complex rock mass. Finally, the problems that need to be further studied are put forward. The research results provide a valuable reference for the study of complex rock mass by the composite material micromechanics method.

Estimation of Strength of Massive Jointed Rock Mass Based on Generalized Hoek-Brown Criterion

2012 ◽  
Vol 204-208 ◽  
pp. 259-262
Author(s):  
Feng Shan Han
Keyword(s):  
Regression Analysis ◽  
Rock Mass ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Geological Strength Index ◽  
Engineering Analysis ◽  
Strength Index ◽  
Practical Engineering ◽  
Coulomb Criterion

The strength of massive jointed rock mass can be estimated based on Mohr-Coulomb criterion and Hoek-Brown criterion without making expensive experiment of massive jointed rock mass in site. Only using regression analysis, through transformation，Mohr-Coulomb criterion is compared with Hoek-Brown criterion, the strength of jointed rock mass can be economically obtained. In this paper, based on Geological Strength Index GSI and parameter Jv(Joint/m3), the strength of massive jointed rock mass can be obtained. As an example of GSI 24 for massive jointed rock mass is taken, generalized Hoek-Brown criterion is analyzed linearly and approximately using regression analysis, strength of jointed rock mass can be economically obtained That provide economical and effective method for practical engineering analysis

New Constitutive Model for Two-Dimensional Jointed Rock Mass

2011 ◽  
Vol 368-373 ◽  
pp. 641-646
Author(s):  
Qiang Xu ◽  
Jian Yun Chen ◽  
Jing Li
Keyword(s):  
Rock Mass ◽  
Geotechnical Engineering ◽  
Jointed Rock ◽  
Mechanical Analysis ◽  
Jointed Rock Mass ◽  
Equivalent Model ◽  
Two Dimensional ◽  
Finite Element Program ◽  
Unit Square ◽  
Flexibility Matrix

Mechanical analysis for jointed rock mass is very significant in geotechnical engineering. In particular, the mechanical characteristics of jointed rock mass can result in nonlinear response of geotechnical engineering and in consequence mechanical analysis for the engineering is difficult. In order to simulate jointed rock mass, a new equivalent model is proposed for two-dimensional jointed rock mass based on strain energy equivalence principle. Firstly, the equivalent elastic modulus and Poisson's ratio for a horizontal joint in unit square is deduced. Then, the equivalent flexibility matrix for a joint of specified angle in unit square is given. Moreover, the equivalent flexibility matrix for multiple joints, which have different angles in unit square, is obtained. Finally, a numerical simulation is given to verify the model. Compared with other conventional algorithm, the proposed approach has some strong points: it is easy to implement in the finite element program. Furthermore, it provides a new model to compute the deformation of joints and rock and the precision is high.

scholarly journals Experimental Study on Corrosion of Anchored Rock Mass for Half-Through Intermittent Joints

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Wantao Ding ◽  
Mingjiang Li ◽  
Mingbin Wang ◽  
Rui Chen ◽  
Yang Wang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Bond Strength ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Jointed Rock ◽  
Computational Formula ◽  
Performance Loss ◽  
Practical Engineering ◽  
The Relationship ◽  
Ultimate Bond Strength

Make crackled mortar test block to simulate jointed rock mass reinforced by anchor bars. Computational model of corrosion penetration at different load times can be obtained by corrosion acceleration through electrochemistry. Through observation of anchor bar after corrosion, it is found that primary corrosion is mainly pitting; however, with the development of corrosion, corrosion moves along etch pit to the upper and lower surfaces so as to form partial corrosion. Meanwhile, computational formula of pitting ratio is put forward on the basis of mass loss rate. It is found that, through the pulling out experiment of anchor bar corrosion, corrosion has remarkable influence on anchoring performance of anchor bar; meanwhile, different pitting ratios have different influences on trends of ultimate bond strength, for example, when pitting ratio is bigger (between 9% and 30%), the biggest decreasing rate of bond strength is obviously lower than that under lower pitting ratio (from 1.5% to 5%). According to linear fitting of experimental data, the relationship curve of K, ultimate bond strength ratio, and pitting ratio can be obtained so as to provide basis for judgement of anchoring performance loss in practical engineering.

scholarly journals Experimental Study on the Deterioration Rules of Anchoring Performance of Rock Mass under Different Joints Distribution

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Wantao Ding ◽  
Minglei Hou ◽  
Lei Chen ◽  
Keqi Liu ◽  
Rui Chen ◽  
...  
Keyword(s):  
Rock Mass ◽  
Bond Strength ◽  
Mechanical Test ◽  
Corrosion Damage ◽  
Jointed Rock ◽  
Accelerated Corrosion ◽  
Joint Rock Mass ◽  
Practical Engineering ◽  
Accelerated Corrosion Test ◽  
Joint Rock

In order to analyze the influence of damage caused by corrosion on anchoring performance of a rock mass with different joints, the anchored rock mass specimens with different joints distribution were prepared. An electrochemical accelerated corrosion test of specimens was carried out, and the mechanical test of them under different corrosion time was also investigated. The results showed that the pitting corrosion is the main form of the anchor bar corrosion of an anchoring rock mass with different joints, and the shape of the etch pit is reverse semi-ellipse. With the increase of pitting ratio, the ultimate bond strength and the corresponding slide distance decrease gradually. The effects of pitting ratio on the slide distance of the anchor bar in an anchored joint rock mass are insignificant, but these on the bond strength of it are significant. The bond-slide model of the anchored joint rock mass with different pitting ratios was established. The research results of this paper can provide reference for analyzing the corrosion damage of a complex anchored joint rock mass in practical engineering and a theoretical basis for the design optimization of anchoring support in the complex jointed rock mass.

Risk Analysis on the Accident of TBM’s Cutterhead Jamming Caused by Collapse of Tunnel

2012 ◽  
Vol 446-449 ◽  
pp. 2246-2250 ◽  
Author(s):  
Sen Wen ◽  
Han Zhou Liu ◽  
Li Min Zhao
Keyword(s):  
Probability Theory ◽  
Rock Mass ◽  
Risk Analysis ◽  
Risk Evaluation ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Resistance Torque ◽  
Practical Engineering ◽  
Evaluation Matrix ◽  
The Relationship

If TBM does the excavating work in jointed rock mass, the cutterhead may be jammed. In order to decrease the loss, it is necessary to carry out risk evaluation. Whether the cutterhead is jammed or not depends on the relationship between torque and resistance torque. The magnitude of resistance torque depends on height of collapse, so according to the randomicity of height of collapse and probability theory, a formula for calculating the probability of cutterhead jamming is established. Meanwhile, according to the magnitude of resistance torque and cutterhead’s parameters, consequence of cutterhead jamming is divided into five ranks. Based on probability and consequence ranks, risk evaluation matrix for TBM’s cutterhead is proposed. The research results are demonstrated logically by the calculation of practical engineering.

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