Parameters Optimization of Airtight Wall in Crossheading of Fully-Mechanized Caving Face Using FLAC-3D Software

2016 ◽  
Author(s):  
Guest Editor Jianping Du
Keyword(s):  
Parameters Optimization ◽  
Flac 3D ◽  
3D Software

Determining The Minimum Distance Between Centers of Two Parallel Tunnels to Apply The Law of Super Position in Order to Calculate Subsidence by Using The Software FLAC 3D

2015 ◽  
Vol 1 (1) ◽  
pp. 13-20
Author(s):  
Hamid Reza Samadi ◽  
Mohammad Reza Samadi
Keyword(s):  
Minimum Distance ◽  
Surface Subsidence ◽  
Urban Traffic ◽  
Underground Structures ◽  
Rapid Population Growth ◽  
The North ◽  
Flac 3D ◽  
The Law ◽  
3D Software ◽  
Twin Tunnels

Due to the development of cities as well as rapid population growth, urban traffic is increasing nowadays. Hence, to improve traffic flow, underground structures such as metro, especially in metropolises, are inevitable. This paper is a research on the twin tunnels Of Isfahan's metro between Shariaty station and Azadi station from the North towards the South. In this study, simultaneous drilling of subway's twin tunnels is simulated by means of Finite Difference Method (FDM) and FLAC 3D software. Moreover, the lowest distance between two tunnels is determined in a way that the Law of Super Position could be utilized to manually calculate the amount of surface subsidence, resulted by drilling two tunnels, by employing the results of the analysis of single tunnels without using simultaneous examination and simulation. In this paper, this distance is called "effective distance". For this purpose, first, the optimum dimensions of the model is chosen and then, five models with optimum dimensions will be analyzed separately, each of which in three steps. The results of analyses shows that the proportions (L/D) greater than or equal 2.80, the Law of Super Position can be applied for prediction of surface subsidence, caused by twin tunnels' construction

Numerical Simulation for Construction Process Large-Span Flat Tunnel under the Condition of Shallow Buried

2014 ◽  
Vol 580-583 ◽  
pp. 1100-1104
Author(s):  
Jun Jie Li ◽  
Li Tuo ◽  
Guan Jun Zhang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Tunnel Construction ◽  
Construction Process ◽  
Large Span ◽  
Tunneling Method ◽  
Stress Changes ◽  
Flac 3D ◽  
3D Software ◽  
Grade Rock

The thesis takes a three-lane tunnel construction in Zhejiang as an example. Simulating the course of dynamic construction of large-span tunnel on geology condition of four-grade rock mass and shallow buried by FLAC 3D software ,it carries out comparative and stress situation in the runnel surrounding rocks .Getting the displacement and stress changes rule of the construction by using benching with a small pilot tunnel tunneling method can guide the construction scientifically.

Monitoring Analysis of Tunnel Construction in a New Subway Line Down-Through an Existed Line

2012 ◽  
Vol 525-526 ◽  
pp. 577-580
Author(s):  
Fei Dong ◽  
Jun Dong ◽  
Yu Ping Cui ◽  
Wei Ze Sun ◽  
Dong Yong Li
Keyword(s):  
Longitudinal Direction ◽  
Theoretical Research ◽  
Tunnel Construction ◽  
Construction Process ◽  
Cross Sectional ◽  
Site Monitoring ◽  
Practical Engineering ◽  
Flac 3D ◽  
Subway Construction ◽  
3D Software

For a practical engineering in which the tunnel of Subway Line No.7 between Guangqumen outside Station and Shuangjing station is down through Shuangjing Station of existed Subway Line No.10, numerical simulations of construction process of the tunnel have been investigated by FLAC 3D software and compared with site monitoring data. The sedimentation curves of the earth's surface along the cross-sectional and longitudinal direction are obtained, which show that all results including numerical simulation and site monitoring are accord with the data from the Peck formula. At the same time according to numerical computation, some relations between width and depth of excavating a tunnel are discussed. All these have important significant to theoretical research and engineer practice of subway construction.

Law of Ground Subsidence and Strata Movement Caused by Backfill Mining of "under Three" Coal

2013 ◽  
Vol 807-809 ◽  
pp. 2304-2308 ◽  
Author(s):  
Wei Jian Yu ◽  
Tao Feng ◽  
Xin Yuan Chen
Keyword(s):  
Three Dimensional ◽  
Coal Pillar ◽  
Simulation Method ◽  
Mining Area ◽  
Computational Scheme ◽  
Ground Subsidence ◽  
Strata Movement ◽  
Backfill Mining ◽  
Flac 3D ◽  
3D Software

Taking 24 mining area of Zhouyuanshan mine as the research object, analysis on law of ground subsidence and strata movement caused by backfill mining of "under three" coal is carried on by using numerical simulation method. A three-dimensional numerical model is established by using FLAC 3D software. To analyze the computational scheme of remain wide coal pillar and gradually to finish backfill mining, results showed that the maximal subsidence displacement value is 30.8mm along the coal strike and the subsidence displacement value is 32.1mm along the coal seam inclination; In addition, computational scheme of backfill mining with narrow coal pillar is analyzed, results showed that the filling body plays a stronger supporting role for the roof strata, to fully mobilize the bearing capacity of filling body, forming a relatively coordinated bearing system of " backfill body + coal pillar + overlying strata ".

Research on Movement and Deformation Rules of Rock Strata between Coal Seams in Caving Method Upward Mining of Left-Over Coal with Numerical Simulation Method

2011 ◽  
Vol 58-60 ◽  
pp. 1188-1193
Author(s):  
Cong Ming Zhong ◽  
Guo Rui Feng ◽  
Hong Fu Liu ◽  
Jing Zheng
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Deformation Condition ◽  
Coal Seams ◽  
Before And After ◽  
Flac 3D ◽  
Mining Face ◽  
3D Software ◽  
Rock Strata ◽  
Upward Mining

In this paper, the process of upward mining in Baijiazhuang mine is analyzed by the simulation function in FLAC-3D software. Basing on the actual drilling column of the upward mining face in Baijiazhuang mine, the variation of rock pressure before and after upward mining is calculated and analyzed by means of numerical simulation model, and then the deformation and movement of the rock strata between coal seams before and after mining the upper and lower coal are further studied. Finally, the simulation results of studying the rock layer’s mechanical relationship and deformation condition is the same with actual mining.

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