The Special Geological Conditions of Mountain Tunnel Scheme Selection

2013 ◽  
Vol 405-408 ◽  
pp. 1288-1291
Author(s):  
Li Xia Sun ◽  
Qing Bo Wang ◽  
Da Peng Wang
Keyword(s):  
Engineering Practice ◽  
Engineering Analysis ◽  
High Slope ◽  
Hole Argument ◽  
Geological Conditions ◽  
Practical Engineering ◽  
Scheme Selection ◽  
Shallow Buried Tunnel ◽  
Mountain Tunnel

According to the different topographic and geologic conditions of mountain highwaytunnel project has been "It is difficult into the hole and out the hole " argument. The paper is WuGuanhigh-speed road asymmetric bias multi-arch tunnel, and the orthogonal hole separated tunnel, near themountain steep high slope of shallow buried tunnel into the hole as an example. Through theconstruction of practical engineering, analysis in special conditions is done and the mechanicalmechanism of hole program is correctly chosen. Importance and the experiences are summarized, toguide the engineering practice.

scholarly journals Optimizing Simulation and Analysis of Automated Top-Coal Drawing Technique in Extra-Thick Coal Seams

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 232 ◽  
Author(s):  
Qunlei Zhang ◽  
Ruifu Yuan ◽  
Shen Wang ◽  
Dongyin Li ◽  
Huamin Li ◽  
...  
Keyword(s):  
Numerical Models ◽  
Time Estimation ◽  
Engineering Practice ◽  
Coal Seams ◽  
Control Approach ◽  
Working Face ◽  
Geological Conditions ◽  
Round Number ◽  
Element Approach ◽  
Drawing Technique

A particle element approach based on continuum-discontinuum element method (CDEM) is applied to optimize the automated top-coal drawing techniques in extra-thick coal seams. Numerical models with 100 drawing openings are created according to the field engineering geological conditions of Tongxin coal mine in China. An automated coal drawing control approach in numerical modelling based on time criterion is proposed. The rock mixed rate, top-coal recovery rate and the variance of the drawn top coal amount are counted and set as the statistical indicators to evaluate the top-coal drawing techniques. The traditional top-coal drawing criterion, “rocks appear, close the opening”, leads to low recovery of top coal and waste of coal resources in extra-thick coal seams, significantly weakening the transport stability and efficiency of the scraper conveyer. A three-round unequal time top-coal drawing technique is proposed for automated top-coal drawing. Three drawing openings, corresponding to the three top-coal drawing rounds respectively, are working at the same time; in each round, the top-coal drawing sequence is from the first drawing opening at one end of the working face to last drawing opening at another end; the drawing time of each round is not equal and increases with the round number. The numerical inversion approach of iteration steps can be used for real top-coal drawing time estimation and automated drawing process design to achieve a better top coal drawing effect, while the exact time for each drawing round still needs to be corrected by engineering practice.

scholarly journals The Stability of Gob-Side Entry Retaining in a High-Gas-Risk Mine

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Junwen Zhang ◽  
Yulin Li
Keyword(s):  
Coal Mines ◽  
Surrounding Rock ◽  
Shanxi Province ◽  
Engineering Practice ◽  
Efficient Production ◽  
Coal Recovery ◽  
Working Face ◽  
Geological Conditions ◽  
The Stability ◽  
Strengthening Technique

There are series of problems faced by most of the coal mines in China, ranging from low-coal recovery rate and strained replacement of working faces to gas accumulation in the upper corner of coalfaces. Based on the gob-side entry retaining at the No. 18205 working face in a coal mine in Shanxi Province, theoretical analysis, numerical simulation, and engineering practice were comprehensively used to study the mechanical characteristics of the influence of the width of the filling body beside the roadway and the stability of surrounding rock in a high-gas-risk mine. The rational width of the filling body beside the roadway was determined, and a concrete roadway-side support with a headed reinforcement-integrated strengthening technique was proposed, which have been applied in engineering practice. The stability of the filling body beside the roadway is mainly influenced by the movement of the overlying rock strata, and the stability of the surrounding rock can be improved effectively by rationally determining the width of the filling body beside the roadway. When the width of the roadway-side filling body is 2.5 m, the surrounding rock convergence of the gob-side entry retaining is relatively small at only 5% of the convergence ratio. It has been shown that the figure for roof separation is relatively low, and strata behaviors are relatively alleviated and gas density do not exceed the limit, which are the best results of gob-side entry retaining. The results of this research can provide theoretical guidance for excavation of coal mines with similar geological conditions and have some referential significance to safety and efficient production in coal mines.

Buckling Analysis of Single-Layer Reticulated Shells

2014 ◽  
Vol 578-579 ◽  
pp. 456-459
Author(s):  
Fan Wang ◽  
Ding Ding Liu ◽  
Xiao Yi Lan
Keyword(s):  
Single Layer ◽  
Buckling Analysis ◽  
Engineering Analysis ◽  
Paper Briefly ◽  
Practical Engineering

This paper briefly introduces methods of buckling analysis, develops a model of single-layer reticulated shell in SAP2000 and carries out buckling analysis of it, using ABAQUS. The results in this paper can be recommended for practical engineering analysis of grid structures.

Deep Well of Coal Roadway Bolt-Cable Mechanism Analysis and its Engineering Application

2012 ◽  
Vol 226-228 ◽  
pp. 1094-1097 ◽  
Author(s):  
Bai Xiao Tang ◽  
Yong Wei Wang
Keyword(s):  
High Stress ◽  
Soft Rock ◽  
Engineering Practice ◽  
Construction Technology ◽  
Mechanism Analysis ◽  
Small Aperture ◽  
Deep Well ◽  
Coal Roadway ◽  
Geological Conditions ◽  
Support Cost

Cable Anchor Supporting mechanism theory analysis, combined with high geostress, composite roof and complex geological conditions, the deep well under conditions of coal roadway by small aperture, anchor on the form of the structure and high prestressed construction technology, engineering practice shows that the technology is simple and applicability,is deep well solve the high stress soft rock tunnel, large sections into bifurcation point supports of the effective way of the problem. Not only reduces the support cost, reduce the workload of the Lane repair, and also greatly reduce the labor intensity of construction personnel, improve the reliability of the engineering safety. Accumulated experience, has broad application prospects for the deep well under the conditions of the other coal mine soft rock roadway

The High Slope Stability Monitoring of the Operation Period Highway

2012 ◽  
Vol 433-440 ◽  
pp. 6414-6416
Author(s):  
Zhi Yong He ◽  
Xiu Long Yang
Keyword(s):  
Slope Stability ◽  
Driving Safety ◽  
Normal Operation ◽  
Monitoring Method ◽  
High Slope ◽  
Stability Monitoring ◽  
Monitoring Result ◽  
Geological Conditions ◽  
Operation Period ◽  
Abnormal Phenomenon

The number of the high slope along the highway is much more, except this, the geological conditions is complex. To ensure the driving safety and the normal operation of the highway, it’s meaningful to monitor the deformation trend of high slope and discover abnormal phenomenon timely and treat it. The paper taking freeway high slope monitoring project as an example, study the purpose of high slope stability monitoring, the monitoring method and the setting of the monitoring net. It also analysis the monitoring results. The results show that the monitoring spot displacements of the slope are small and there is no symptom to occur geological disaster such as landslide, slump, avalanches and so on. The slope is basically stable. The monitoring result has verified the feasibility and the effectiveness of the monitoring scheme. Expecting this can offer reference and gather experience for similar projects

scholarly journals Application of Electromechanical Installation Construction Technology in Practical Engineering

2020 ◽  
Vol 2 (2) ◽  
pp. 58
Author(s):  
Zichuan Huang
Keyword(s):  
Practical Experience ◽  
Engineering Practice ◽  
Construction Technology ◽  
Construction Engineering ◽  
Continuous Innovation ◽  
Practical Engineering ◽  
Installation Technology ◽  
The Relationship

<p>Nowadays, with the continuous development of economy and society, the frequency of electromechanical installation projects in various industries is getting higher and higher. With the continuous improvement of mechanization level, the requirements for business personnel engaged in mechanical and electrical installation engineering are getting higher and higher. Electromechanical installation is a very important part in construction engineering. Only through continuous innovation, technical renewal and transformation, can the engineering function be effectively guaranteed and the economic benefit be increased. As urban construction enters the fast lane, people's requirements for the quality of life are gradually improved. The installation of construction electromechanical projects is the most prominent link in construction engineering, so construction units should pay attention to the installation of engineering electromechanical projects. The emphasis of engineering electromechanical installation is the control of installation quality and the innovation of installation technology. Based on the author's practical experience, this article first emphasizes the necessity of electromechanical installation, and then explains the relationship between construction engineering and electromechanical installation in combination with engineering practice, aiming at emphasizing the irreplaceable role of electromechanical installation in construction engineering.</p>

scholarly journals The Application of Tunnel Reflection Tomography in Tunnel Geological Advanced Prediction Based on Regression Analysis

2015 ◽  
Vol 9 (1) ◽  
pp. 805-810
Author(s):  
Jun Li ◽  
Zong-lin Wang
Keyword(s):  
Regression Analysis ◽  
Complex Dynamics ◽  
Water Inrush ◽  
Karst Water ◽  
Geological Conditions ◽  
Geological Prediction ◽  
Influence Degree ◽  
Reflection Tomography ◽  
Complex Geology ◽  
Mountain Tunnel

In the tunnel construction, due to the limitation of the survey and design and the complex dynamics of tunnel surrounding rock geological conditions, so it is difficult for complex geology with the microscopic accurate grasp, often which caused by geological exploration data do not tally with the actual situation, often encountered in karst water inrush, large deformation in weak rock, cave-in subsidence, geological hazards, such as gas outburst, rock burst cause person casualties, delays, in order to minimize geological disaster influence degree, advanced geological prediction before construction is very necessary. Using regression analysis, based on engineering vault subsidence and horizontal convergence has carried on the regression analysis, research results can be reference for related engineering design and construction. Detailed introduces the principle, methods and outstanding characteristic of tunnel reflection tomography advanced prediction system, and take Jianfengling mountain tunnel of Darui line railway as an example, the prediction results are analyzed in detailed processing, and on-site validation, finally points out the problem for further study the technology.

Application of Composite Sandwich Panels in Construction Engineering

2013 ◽  
Vol 291-294 ◽  
pp. 1172-1176 ◽  
Author(s):  
Ke Wei Ding ◽  
Gang Wang ◽  
Wan Yun Yin
Keyword(s):  
Thermal Insulation ◽  
Sandwich Panels ◽  
Constructional Material ◽  
Structural Safety ◽  
Sound Insulation ◽  
Engineering Practice ◽  
Construction Engineering ◽  
Composite Sandwich Panels ◽  
Composite Sandwich ◽  
Practical Engineering

As a new constructional material, composite sandwich panels are applied in engineering more often than ever. This paper focuses on the structure and foreign research status of sandwich panels which are used in practical engineering problems that need attention. The structure of the composition of the sandwich panel, force characteristics and analysis methods, a set of load-bearing thermal insulation, sound insulation and decoration in one of the new sandwich insulation composite wall form, can comprehensively address architectural, structural safety, and contradict the thermal insulation performance and durability problem. Thus they can be better applied to the engineering practice and meet the development requirement of building energy-saving and adaptation of housing industrialization.

Foundation Pit Deformation during the Excavation and Simulation

2014 ◽  
Vol 577 ◽  
pp. 1123-1126
Author(s):  
Bai Cheng Ren
Keyword(s):  
Ground Surface ◽  
Surface Subsidence ◽  
Engineering Practice ◽  
Soil Deformation ◽  
Foundation Pit ◽  
Maximum Deformation ◽  
Deformation Law ◽  
Ground Surface Settlement ◽  
Practical Engineering ◽  
Rock And Soil

Based on the background of foundation pit excavation of a village, the process of excavation is simulated by FLAC3D .And the calculation and analysis is combined with the engineering practice. The results show that the deformation of foundation pit is mainly composed of ground surface settlement, and the maximum deformation occurred in the middle of the pit wall at the top of the part. The surface subsidence with the ongoing of the excavation, the general surface subsidence trend is rising. When it comes to the foundation pit, when the settlement velocity is very large, the foundation turns to be unstable, which need supporting methods. Flac3D program applied on the excavation of rock and soil deformation law study is feasible. The result of the study to further relevant basis are provided for the practical engineering and have certain practical application value to the rock and soil deformation in the process of excavation research.

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

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