Effects of gully terrain on stress field distribution and ground pressure behavior in shallow seam mining

2016 ◽  
Vol 26 (2) ◽  
pp. 255-260 ◽  
Author(s):  
Jianwei Li ◽  
Changyou Liu ◽  
Tong Zhao
Keyword(s):  
Stress Field ◽  
Field Distribution ◽  
Pressure Behavior ◽  
Ground Pressure ◽  
Seam Mining

Study on the Structure Characteristics and Ground Pressure Behavior of Overlying Strata with Shallow Buried Coal Seam

2011 ◽  
Vol 255-260 ◽  
pp. 3780-3785 ◽  
Author(s):  
Lei Yu ◽  
Zhi Zhong Fan ◽  
Gang Xu
Keyword(s):  
Coal Seam ◽  
Ground Subsidence ◽  
Mine Pressure ◽  
Structure Characteristics ◽  
Pressure Behavior ◽  
Ground Pressure ◽  
Working Face ◽  
Periodic Pressure ◽  
Seam Mining ◽  
Overlying Strata

The mine pressure behavior characters of shallow buried coal seam differed from both shallow seam mining and general depth seam. Mine pressure observation and numerical analysis were applied to research mine pressure behavior laws in fully mechanized face of shallow buried coal seam with thick bedrock and thin alluvium. It showed that the ground subsidence level phenomenon did not appear obviously although with obvious dynamic loading of fully mechanized face during the pressure period. The appearance was due to non-synchronized fracture from two key layers in the overlying rock layers and their interaction, which leaded to roof breaking initially and caving rocks with the form of an arch. Due to the periodic breaking and caving characteristics appearing as fully cut-down and arch alternately, the periodic pressure of shallow buried coal seam face showed as different size. The conclusion could be a reference for similar working face control.

Effects of the Shape of Workpiece on the Temperature and Stress Field Distribution during Laser Transformation Hardening

2012 ◽  
Vol 39 (8) ◽  
pp. 0803001
Author(s):  
张哲 Zhang Zhe ◽  
韩彬 Han Bin ◽  
王勇 Wang Yong ◽  
王楠楠 Wang Nannan
Keyword(s):  
Stress Field ◽  
Field Distribution ◽  
Laser Transformation Hardening

scholarly journals Failure Mechanism and Control Technology of Thick and Soft Coal Fully Mechanized Caving Roadway under Double Gobs in Close Coal Seams

2020 ◽  
Vol 2020 ◽  
pp. 1-23
Author(s):  
Shengrong Xie ◽  
Xiaoyu Wu ◽  
Dongdong Chen ◽  
Yaohui Sun ◽  
En Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coal Seam ◽  
Field Distribution ◽  
Control Technology ◽  
Coal Seams ◽  
Anchor Bolt ◽  
Anchor Cable ◽  
Coal Pillars ◽  
Seam Mining ◽  
And Control

The surrounding rock of the roadway under double gobs in the lower coal seams is partially damaged by the mining of the upper coal seam and the stress superimposition of the stepped coal pillars. What is worse, the upper layer of the roof is collapse gangue in double gobs, which makes the anchor cable unable to anchor the reliable bearing layer, so the anchoring performance is weakened. The actual drawing forces of the anchor bolt and anchor cable are only approximately 50 kN and 80 kN, respectively. The roadway develops cracks and large deformations with increasing difficulty in achieving safe ventilation. In view of the above problems, taking the close coal seam mining in the Zhengwen Coal Mine as the engineering background, a theoretical calculation is used to obtain the loading of the step coal pillars and the slip line field distribution of the floor depth. The numerical simulation monitors the stress superimposition of stepped coal pillars and the distribution of elastoplastic areas to effectively evaluate the layout of mining roadways. The numerical simulation also analyzes the effective prestress field distribution of the broken roof and grouting roof anchor cable. A laboratory test was used to monitor the strength of the grouting test block of the broken coal body. Then, we proposed that grouting anchor cable be used to strengthen the weak surface of the roof and block the roof cracks. From on-site measurement, the roadway was seen to be arranged in the lateral stress stabilization area of the stepped coal pillars, the combined support technology of the grouting anchor cable (bolt) + U type steel + a single prop was adopted, the roadway deformation was small, the gas influx was reduced, and the drawing force of the anchor bolt and the anchor cable was increased to approximately 160 kN and 350 kN, respectively. The overall design and control technology of the roadway can meet the site safety and efficient production requirements.

Temperature Stress Field Distribution Study of Asphalt Carrier’S Based on Rockwool Damaged

2011 ◽  
Vol 189-193 ◽  
pp. 2005-2008
Author(s):  
Yong He Xie ◽  
Wei Wang ◽  
Gang Qiang Li
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Temperature Stress ◽  
Field Distribution ◽  
Material Properties ◽  
Element Model ◽  
Distribution Study ◽  
Hull Structure ◽  
Insulation Performance ◽  
The Finite Element Model

The rockwool has excellent thermal insulation performance, makes the hull structure and high-temperature asphalt effective isolation. But asphalt carrier’s temperature stress field distribution will be impacted once the rockwool damaged, so the rockwool damage factors are interested. The finite element model of cargo hold and rockwool are created in the present paper, the temperature stress field distribution is concerned with different boundary conditions and material properties.

Key Technology Research of the Temperature Field Simulation Based on the Flat Butt Weld

2012 ◽  
Vol 562-564 ◽  
pp. 729-732 ◽  
Author(s):  
Yu Wen Li ◽  
Fu Xing Wang
Keyword(s):  
Residual Stress ◽  
Temperature Field ◽  
Stress Field ◽  
Field Distribution ◽  
Welding Process ◽  
Residual Stress Field ◽  
Butt Weld ◽  
Temperature Method ◽  
Simulation Based ◽  
Direct Loading

Aluminum as solder, in the flat welding process, the temperature field and the residual stress field distribution was the main problem of the study; According to the actual situation of the welding process, using the direct loading temperature method and the indirect loading temperature method , the main path of temperature field distribution curves and the residual stress field distribution were gained by 2D numerical simulation respectively; Through comparison, the indirect loading method can get more accuracy of residual stress field distribution than that of the direct loading temperature method; The above methods were useful in practical production.

The Pressure Behavior Regularity of Workface and Simulation Optimization Analysis of Support Type Choice

2011 ◽  
Vol 282-283 ◽  
pp. 90-95
Author(s):  
Hong Kai Dong ◽  
Hou Quan Zhou
Keyword(s):  
Simulation Optimization ◽  
Discrete Element ◽  
Mine Pressure ◽  
Strata Movement ◽  
Pressure Behavior ◽  
Simulation Techniques ◽  
Ground Pressure ◽  
Geological Conditions ◽  
Mining Face ◽  
Overburden Strata

This paper simulated mining face advancing with discrete element software UDEC to study the mining overburden strata movement and mine pressure behavior, so as to determine reasonable supporting method. According to the simulation test data, this paper also determines the range of compaction region, support active region, pressure increase region and stable pressure region, so as to prove the reasonability of the hydraulic support type, and proposes the method of support type choice by simulation techniques. Ground pressure behavior is an inevitable phenomenon during the mining process[1-3]. It is necessary to take the appropriate supporting measures to support the surrounding rock, lest endanger the safety of personnel and engineer equipments in underground workface. More laboratory studies[4][5] and scene investigation are in the existing studies, so there is a good understanding of ground pressure behavior. The numerical simulation can be made in advance when geological conditions can be determined. It can provide corresponding suggestions for the project according to ground pressure appearing regularity founded by simulation. This paper studys the overburden strata movement and ground pressure behavior, and determines reasonable support type by simulation optimization with discrete element software[6] UDEC. And by comparing with the work field, we found evidences that the simulation optimization is feasible. with work field.

Sign in / Sign up

Export Citation Format

Share Document