scholarly journals State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China

2019 ◽  
Vol 16 (4) ◽  
pp. 2371-2390 ◽  
Author(s):  
Zhijun Liu ◽  
◽  
Xiaobi Wei ◽  
Dongquan Wang ◽  
Liangliang Wang
Keyword(s):  
Civil Engineering ◽  
Underground Engineering ◽  
Mining Technology ◽  
Engineering School ◽  
Deep Underground

The Fracture Characteristic of Mode III Rock Crack under Different Temperature

2014 ◽  
Vol 891-892 ◽  
pp. 884-888
Author(s):  
Li Yun Li ◽  
Tie Wu Tang ◽  
Zhi Qiang Xu ◽  
Wen Bin Liu ◽  
Guo Yane Zhou
Keyword(s):  
Finite Element Method ◽  
Fracture Toughness ◽  
Finite Element ◽  
Disaster Prevention ◽  
Mode Iii ◽  
Underground Engineering ◽  
Different Temperatures ◽  
Deep Underground ◽  
Rock Specimens ◽  
Initiation Stress

A series of torsion tests under different temperature were carried out with circumferential notched cylindrical rock specimens. By this kind of specimens, mode III rock crack propagation in real meaning was realized. The initiation torsion M of the mode III rock crack was measured under different temperature. The variation law of M v.s. temperature T was obtained. The initiation stress near crack tip under different temperatures was calculated by finite element method, and then, the mode III fracture toughness KIIIC of the rock was obtained by further calculation. The experiment and numerical results show that the mode III fracture toughness of the rock decreases with the temperature increase. The results of the paper can be used in the design of deep underground engineering ,disaster prevention and mitigation engineering.

Application of Numerical Simulation Experiment in Geotechnical Engineer Teaching

2012 ◽  
Vol 256-259 ◽  
pp. 3107-3110
Author(s):  
Wen Juan Feng ◽  
Xiao Dong Ju
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Simulation Experiment ◽  
Civil Engineering ◽  
Good Teaching ◽  
Engineering School ◽  
Normal Test ◽  
Teaching Text ◽  
Large Scale Project

In article we analyzes the conventional experimental method’s characteristic and expatiates the predominance of numerical simulation experiment. The numerical simulation experiment is applied in teaching text in civil engineering school of Henan Polytechnic University and obtained the very good teaching effect. Numerical simulation experiment can simulate routine experiment and get curve and data which can’t be obtained by normal test. Numerical simulation experiment also can simulate large-scale project which can't be done by conventional experiment.

Surrounding Rock Stress and Deformation Evolution Character Analysis of Circular Openings in Deep Underground Engineering

2011 ◽  
Vol 418-420 ◽  
pp. 2001-2005
Author(s):  
Ai Ping Yuan ◽  
Mao Wei Ji ◽  
Dai Qiang Deng
Keyword(s):  
Hard Rock ◽  
Confining Pressure ◽  
Surrounding Rock ◽  
Rock Stress ◽  
Underground Engineering ◽  
High Confining Pressure ◽  
Deep Underground ◽  
Stress And Deformation ◽  
Peak Value ◽  
Surrounding Rock Stress

Hard rock generally performs ideal plastic character after the stress reaches its peak value with high confining pressure. Once the plastic strain satisfies certain condition, the brittle failure occurs, and the rock mass located in the residual region. Based on the mechanical model of hard rock under high confining pressure, we studied the surrounding rock stress and deformation evolution law of circular openings. The results shows that there is a significant end constraint effect at the opening face, and the deformation induced by disturbance is about one sixth of its total value. The results can provide theoritical foundation for deep underground engineer lining design.

Research and Educational Center at the enterprise is the key to the successful activity as a resource provider

2021 ◽  
pp. 22-25
Author(s):  
В.В. Бирюков ◽  
А.К. Стрелков ◽  
М.В. Шувалов ◽  
М.А. Гриднева
Keyword(s):  
Water Supply ◽  
Civil Engineering ◽  
Educational Process ◽  
Highly Qualified ◽  
Engineering School ◽  
Wastewater Disposal ◽  
Higher Education System ◽  
Industrial Enterprises ◽  
Utility Systems ◽  
The Individual

Представлена информация о создании Научно-образовательного центра «Инженерные коммунальные системы» Академии строительства и архитектуры Самарского государственного технического университета в ООО «Самарские коммунальные системы». Описан принцип взаимодействия при организации учебного процесса в Академии строительства и архитектуры по направлению «Строительство», профиль «Водоснабжение и водоотведение» (бакалавриат) и по направлению «Строительство», программы подготовки «Водоснабжение городов и промышленных предприятий», «Водоотведение и очистка сточных вод», «Совершенствование технологий очистки воды и обработки осадков» (магистратура). Приведена информация о целесообразности широкого внедрения в учебный процесс элемента индивидуального обучения. Научно-образовательные центры в системе вузовского обучения обеспечивают подготовку высококвалифицированных специалистов в области водоснабжения и водоотведения и повышают их конкурентную способность на рынке труда. Information on establishing the Research and Educational Center «Engineering Utility Systems» of the Academy of Civil Engineering and Architecture of the Samara State Technical University in «Samarskie Kommunal’nye Sistemy», LLC is presented. The principle of interaction in the organization of the educational process at the Academy of Civil Engineering and Architecture in «Civil Engineering» school, the profile «Water supply and wastewater disposal» (Bachelor's degree) and in «Civil Engineering» school, the training program «Water supply of cities and industrial enterprises», «Wastewater disposal and treatment», «Improvement of technologies for water purification and sludge treatment» (Master's degree). The information on the expediency of widespread introduction of the individual training element into the educational process is presented. Research and educational centers in the higher education system provide for training of highly qualified specialists in the field of water supply and wastewater disposal, and increasing their competitiveness in the labor market.

A Study of Rock Crack Fracture under Different Temperatures

2013 ◽  
Vol 577-578 ◽  
pp. 185-188
Author(s):  
Li Yun Li ◽  
Ming Xiu Li ◽  
Zhi Qiang Xu ◽  
Chen Fan ◽  
Da An Liu
Keyword(s):  
Fracture Toughness ◽  
Mixed Mode ◽  
Mixed Mode Fracture ◽  
Underground Engineering ◽  
Mode Fracture ◽  
Three Point Bending ◽  
Critical Fracture ◽  
Relative Stress ◽  
Different Temperatures ◽  
Deep Underground

A series of critical fracture toughness of two kinds of rock materials under different temperature which varied from-50°C to 240°C are measured by I-II-III mixed mode fracture experiments adopting atypical three point bending specimens. Relative stress intensity factors of crack initiation are calculated by finite element method. Combining with calculated values, the experiment results show that, the mixed mode fracture toughness of the rocks decreases with the increase of temperature. The experimental and calculated results can be used in the design of deep underground engineering or disaster prevention and mitigation engineering.

scholarly journals Strain Rockbursts Simulated by Low-Strength Brittle Equivalent Materials

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Lang Li ◽  
Mingyang Wang ◽  
Pengxian Fan ◽  
Haiming Jiang ◽  
Yihao Cheng ◽  
...  
Keyword(s):  
Rock Mass ◽  
Boundary Effect ◽  
High Stress ◽  
In Situ Stress ◽  
Underground Engineering ◽  
Initial State ◽  
Sharp Drop ◽  
Tunnel Support ◽  
Dramatic Rise ◽  
Deep Underground

This paper presents experimental study on rockbursts that occur in deep underground excavations. To begin with, the boundary conditions for excavation in deep underground engineering were analysed and elastic adaptive boundary is an effective way to minimize the boundary effect of geomechanical model test. Then, in order to simulate an elastic adaptive loading boundary, Belleville springs were used to establish this loading boundary. With the aforementioned experimental set-ups and fabrication of similarity models for test, the phenomena of strain mode rockbursts were satisfactorily reproduced in laboratory. The internal stress, strain, and convergences of the openings of the model were instrumented by subtly preembedded sensors and transducers. Test results showed that, with an initial state of high stress from both upper layers’ gravitational effects and in situ stress due to tectonic movements, the excavation brings a dramatic rise in the hoop stress and sharp drop in radial stress, which leads to the splitting failure of rock mass. Finally a rockburst occurred associated with the release of strain energy stored in highly stressed rock mass. In addition, the failure of the surrounding rock demonstrated an obvious hysteresis effect which supplies valuable guide and reference for tunnel support. Not only do these results provide a basis for further comprehensive experiments, but also the data can offer assisting aids for further theoretical study of rockbursts.

scholarly journals Research on Evaluation Method of Rockburst Proneness Based on Energy Principles

2021 ◽  
Author(s):  
Feiyue Sun ◽  
Wenlong Wu
Keyword(s):  
Evaluation Method ◽  
Simulation Analysis ◽  
Underground Engineering ◽  
Energy Principle ◽  
Diversion Tunnel ◽  
Mass Unit ◽  
Research On Evaluation ◽  
Deep Underground ◽  
Jinping Ii Hydropower Station ◽  
Mechanical Factors

Abstract The study of rockburst criterion is the key to predict whether rockburst occurs or not. First of all, based on the energy principle and taking the rock strength and overall failure criterion as the benchmark, the rockburst proneness criterion of rock mass unit under compression and tension was established. The criterion took into account the integrity factors, mechanical factors, brittleness factors and energy storage factors in the process of rockburst inoculation, and three rockburst classification thresholds (2, 11 and 110) for four grades of none, weak, moderate and severe rockburst were proposed. Second, Taking the typical rockburst disaster as examples, the rationality of the existing classical rockburst criterions and the rockburst proneness criterion proposed in this paper were tested, and the results showed that this criterion had good engineering applicability. Finally, the numerical simulation analysis of rockburst disaster in 2# diversion tunnel of Jinping II hydropower station was carried out by using this criterion. The results were basically consistent with the actual situation, which verified the accuracy and effectiveness of the rockburst proneness criterion proposed in this paper. The research results can provide reference for the evaluation and prediction of rockburst disaster in deep underground engineering.

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