Modeling of Surface Subsidence Based on Time Function

2011 ◽  
Vol 422 ◽  
pp. 318-321 ◽  
Author(s):  
Hao Liang Han ◽  
Bo Cui
Keyword(s):  
Dynamic Model ◽  
Dynamic Process ◽  
Underground Mining ◽  
Surface Subsidence ◽  
Time Function ◽  
Subsidence Basin ◽  
Section Function ◽  
New Time

Base on Knothe time function, a new time function was proposed by adding parameter which is approved more accurate in predicting surface subsidence than Knothe funciton. Combing this new time function with section function of surface subsidence basin, a dynamic model is proposed to predict surface subsidence induced by underground mining and a case study based on this model was carried out. The results illustrates this model is more accurate to reflect the dynamic process of surface subsidence

Dynamic Modeling of Surface Subsidence Induced by Underground Mining

2011 ◽  
Vol 382 ◽  
pp. 323-327 ◽  
Author(s):  
Hao Liang Han ◽  
Nai Lian Hu ◽  
Bo Cui
Keyword(s):  
Dynamic Modeling ◽  
Underground Mining ◽  
Surface Subsidence ◽  
Time Function ◽  
Dynamic Mode ◽  
Subsidence Basin ◽  
Iron Mine ◽  
Section Function ◽  
New Time

A new time function was proposed to cover the disadvantage of knothe time function in predicting surface subsidence by adding parameter k. The velocity and acceleration of the progressive surface subsidence obtained from this new time function were compared with actual subsidence data from an iron mine in China. Combining this new time function with section function of surface subsidence basin, a dynamic mode was proposed to predict surface subsidence induced by underground mining and a case study based on this model was carried out. It shows that this model accurately represents the actual subsidence pattern observed. Instruction

Study of Dynamic Coordinates Time Function in Mine Subsidence

2012 ◽  
Vol 594-597 ◽  
pp. 56-60
Author(s):  
Ying Guo ◽  
Guang Yi Zhu ◽  
Xin Liang Jiang ◽  
Ming Dou
Keyword(s):  
Dynamic Process ◽  
Underground Mining ◽  
Surface Subsidence ◽  
Time Function ◽  
Calculation Methods ◽  
Ground Displacement ◽  
Mining Design ◽  
Dynamic Time ◽  
Reflecting Surface ◽  
Surface Dynamic

According to hot research of subsidence time function at home and abroad in recent years that there are commonness of less parameters and difficult to extended reflecting surface subsidence characteristics in the dynamic process, the surface subsidence dynamic coordinates time function were proposed based on the probability integration principle, established the calculation methods of surface dynamic process, anal sized the applicability and limitations of the dynamic time function and verified some examples. The results show that the function is more accurate than the Knothe time function in analyzing the actual regularity of surface subsidence caused by underground mining, reflecting the dynamic characteristics of surface movement in real time, interoperating mining phenomenon, it is more accurate to predict dynamic ground displacement and deformation which has a certain significance value in mining design and subsidence disaster management.

Numerical Modeling of Soil-Pipeline Interaction Mechanism Caused by Surface Subsidence due to Longwall Mining

2013 ◽  
Vol 838-841 ◽  
pp. 2202-2207
Author(s):  
Guo Ming Cheng ◽  
Wen Jie Xu ◽  
Hong Bin Chu
Keyword(s):  
Numerical Modeling ◽  
Cross Sections ◽  
Longwall Mining ◽  
Measurement Data ◽  
Interaction Mechanism ◽  
Surface Subsidence ◽  
Face Advance ◽  
Subsidence Basin ◽  
The Face

In China, Surface subsidence caused by underground coal mining has affected the safe operation of pipelines in recent years. Take the coal mine in Shanxi section of the west-east gas pipeline as case study, numerical modeling was adopted to study the interaction mechanism of the soil-pipeline caused by longwall mining, and the numerical model was calibrated with the measurement data. The results reveal that the soil-pipeline interaction undergoes an evolution process from synchronization to separation during the subsidence process. The peak stresses on the pipeline at cross-sections occur generally above the centre of the corresponding subsidence basins at different stages of face advance, and the maximum stress on the pipeline appeared at about 150m above the centre of the subsidence basin as the face advances 300m.

scholarly journals Application of the Improved Knothe Time Function Model in the Prediction of Ground Mining Subsidence: A Case Study from Heze City, Shandong Province, China

2020 ◽  
Vol 10 (9) ◽  
pp. 3147
Author(s):  
Liangliang Zhang ◽  
Hua Cheng ◽  
Zhishu Yao ◽  
Xiaojian Wang
Keyword(s):  
Underground Mining ◽  
Shandong Province ◽  
Surface Subsidence ◽  
Time Function ◽  
Relative Standard Error ◽  
Function Model ◽  
Dynamic Surface ◽  
Probability Integral Method ◽  
Relative Standard ◽  
Improved Model

Taking into account the inadequacy of the Knothe time function model to predict the dynamic surface subsidence caused by underground mining, a new hypothesis is proposed, and the improved Knothe time function model is established. Theoretical analysis shows the improved model agrees well with surface subsidence dynamic change, velocity change, and acceleration change rules. Combined with field measured data, the probability integral method, dual-medium method, and least square method are adopted to determine the time influence parameter C and the model order n. Based on monitoring data from four monitoring stations in the Guotun coal mine subsidence basin strike main profile from Heze city, Shandong Province, China, the accuracies of the Knothe time function and improved model are compared and analyzed. Results show the improved model can accurately describe the dynamic surface subsidence process and subsidence velocity with mining time. The average relative standard error between the predicted and measured values is only 4.8%—far lower than the Knothe time function model is 23%, verifying the improved model’s accuracy and reliability.

scholarly journals Monitoring, analyzing and predicting urban surface subsidence: A case study of Wuhan City, China

2021 ◽  
Vol 102 ◽  
pp. 102422
Author(s):  
Qing Ding ◽  
Zhenfeng Shao ◽  
Xiao Huang ◽  
Orhan Altan ◽  
Qingwei Zhuang ◽  
...  
Keyword(s):  
Surface Subsidence ◽  
Urban Surface ◽  
Wuhan City

Prediction of Longwall Progressive Subsidence Basin Using the Gompertz Time Function

2021 ◽  
Author(s):  
Jian Wang ◽  
Keming Yang ◽  
Xiangping Wei ◽  
Xiaoyu Shi ◽  
Shuyi Yao
Keyword(s):  
Time Function ◽  
Subsidence Basin

Rock Backfill and Hazard Control of Abandoned Stopes: A Case Study

2013 ◽  
Vol 368-370 ◽  
pp. 1726-1731
Author(s):  
Yi Ming Wang ◽  
Ming Qing Huang ◽  
Ai Xiang Wu ◽  
Gao Hui Yao ◽  
Kai Jian Hu
Keyword(s):  
Rock Burst ◽  
Surface Subsidence ◽  
Waste Rock ◽  
Underground Mines ◽  
Control Potential ◽  
Land Usage ◽  
Hazard Control ◽  
Rock Movement ◽  
Adjacent Rock

Goafs formed in mine-out areas threat the underground mines owing to possibilities of rock burst and surface subsidence. This paper aims to discuss the feasibility, design and construction of waste rock backfill in abandoned stopes. Based on goafs distribution and stabilities in the White Bull Mine, rock backfill system with a total volume of 362,000 m3in 8 gobs was designed and carried out. The system included technologically and economically feasible stopes, conveying equipments of tramcars, rock transfer by electric rakes, haulage network and mining workings. Field effects showed that rock backfill was applicable to control potential hazards. With rock filling, goaf utilization rates ranged from 60% to 70%, which helped to control adjacent rock movement, eliminate rock burst and surface subsidence. Additionally, backfill construction reduced the lift and transportation costs of rocks by about 50%, which further lowered the land usage of surface dumping.

Devolution of Powers in Sarawak: A Dynamic Process of Redesigning Territorial Governance in a Federal System

2017 ◽  
Vol 12 (2) ◽  
pp. 257-279
Author(s):  
Andrew HARDING
Keyword(s):  
Dynamic Process ◽  
Federal System ◽  
Alternative Method ◽  
Cooperative Federalism

AbstractThis article is based on a case study of the developing process of devolution of powers in Sarawak as an aspect of the operation of cooperative federalism in Malaysia. The argument developed is that devolution can be seen and used in conjunction with and in reinforcement of federalism, rather than being simply an alternative method of decentralizing powers. The study finds that this approach may be more promising than a more confrontational approach based on arguments around the fulfilment of the original federal bargain, and is also potentially more open-ended and creative (a process rather than an event), embracing issues within the federal bargain but also issues that are not dealt with in that bargain. The study is based on a unique opportunity to canvass the views of Sarawak leaders at the iteration of the devolution process.

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