Ajay Kumar Jha

BioID GmbH Germany · Artificial Intelligence and Automation in Mining

In deep underground rock engineering projects, rocks are under static pre-load and they may further experience dynamic load due to earthquakes or production blasts. It is thus desirable to consider dynamic failure of rocks subjected to static pre-load. Besides, bending load is commonly encountered near underground openings. Therefore, this study co...

The selection of any main mechanical ventilator for any underground mine is a strategic, tactical, scientific, economic, and complex process. It can only be started after determining the maximum and minimum values of air quantity requirement along with stage-wise mine resistance. It may also be generalized that mine resistance characteristics curve...

To demonstrate the use of computer program, an Indian case study has been discussed. The particulars of all data files, output of the program along with discussion on results, have been analyzed. The program output has two components, i.e., text output and graphical output. The graphical output shows the fan characteristics curve and mine resistanc...

Main mechanical ventilator or mine ventilation fans in modern big coal mines are one of the most expensive operating expenditures. The initial investment, maintenance, and running costs of these mechanical ventilators are also very high. The electrical power consumed by main mechanical ventilator represents at least 15–17% of the total electrical l...

In order to select an optimal ventilator to minimize the ventilation cost and overall cost of mining, a user-friendly program in “C” language has been developed. By running the program “FAN.EXE,” graphical output is produced showing the fan characteristics curve and mine resistance curve. The operating points are also suggested by the program showi...

Ventilation network analysis deals with complex working procedures to calculate the air currents flowing in the various meshes or branches of a mine network. It involves mathematical method of analyzing mine resistance to carry out ventilation planning, management, and control. Network analysis is a generic term covering group of methods that are u...

The average ventilation cost in respect of any underground coal mine contributes to more than one-third of the total operating cost. As ventilation cost is a very significant cost center in respect of any operating underground mine, it is pertinent to apply scientific methods to optimize the ventilation cost to minimize the overall cost of undergro...

This book provides information on proper underground mine ventilation in order to detail its importance in maintaining safe, productive, healthy and effective underground environments at all times for employees. The text covers correct design, implementation and maintenance of mine ventilation through suitable fan installation, and keeps in mind th...

Several underground coal mines are being worked at a depth of 30-150 m from operating surface mines. Under such conditions, ground vibration from surface blasting may be a potential threat to the stability of adjacent underground mines. In this study, field and laboratory investigations were conducted to address this problem. Ground vibrations were...

The stability of underground structure made especially in jointed rock mass is of the utmost important to designer, engineers and operators. Rock bolting is generally being practised to reinforced excavation walls and roofs by minimizing the movement of rock joints. In this study, a numerical procedure has been developed in extended finite element...

Drilling and Blasting are two important unit operations in the production cycle of a mine and a strong link exists between these two and other unit operations/subsystems like loading, transportation, and crushing. Under the present concept of “ Mine to Mill”, it is important to optimize the drilling and blasting operations by applying scientific ap...

The dynamic tensile strength plays a pivotal role in rock fragmentation affecting the overall economics under the present ‘Mine to Mill Concept’. In this paper, a modified SHPB technique and Brazilian test method is presented to test the dynamic tensile strength of coal, shale and sandstone rock samples collected from three opencast mines of Coal I...

oped for prediction of particulate matter. The performance of the multiple regression models was assessed. For the development of neural network models, a feed forward with back propagation learning algorithm was used to train the network. The performance of neural network was determined in terms of correlation coefficient (R) and Mean Square Error...

There are several underground mines in India which operate in close proximity to an operating surface mines. Under such scenario, the blast induced stress waves generated due to surface blasting may be a potential source to cause instability of adjoining underground mine structures. Using seismographs, 54 blast induced vibration data were recorded...

The dynamic tensile strength plays a pivotal role in rock fragmentation affecting the overall economics under the present 'Mine to Mill Concept'. In this paper, a modified SHPB technique and Brazilian test method is presented to test the dynamic tensile strength of coal, shale and sandstone rock samples collected from three opencast mines of Coal I...

Surface blasting may cause ground vibration in underground mine workings affecting their structural stability and resulting in loss of coal production. The effects of surface blasting on adjacent underground workings have been studied using peak particle velocity (PPV) measured at various locations in two underground Bord and Pillar mines. Predicto...