Pham van Hoa

Hanoi University of Mining and Geology · Surface Mining

Optymalizacja wydobycia kamienia blocznego jest istotna z uwagi na możliwość zwiększenia współczynnika odzysku kamienia i zmniejszenie kosztów cięcia. Ze względu na występowanie spękań górotworu, wielkość bloków i kierunek wydobycia wpływają na uzysk w trakcie eksploatacji i koszt cięcia. Dlatego w artykule zasugerowano optymalizację wydobycia kami...

In dimension stone quarry exploitations such as the marblequarry, a literature review of the existing numerical modelling techniqueshas been carried out. According to Distinct Element Method,discontinuities have been treated as boundary conditions between blocksand, consequently, an accurate knowledge of joint distribution andorientation was requir...

In surface mining operations, the operating costs of truck-shovel system constitutes 50-60% ofthe total. Only a little save in the operation costs in this system will bring large profit for the mines. Dueto many investment periods, the capacity of both trucks and shovels in Cao Son surface coal mine isdifferent. This leads to the low efficiency and...

Blast fragmentation size distribution is one of the most critical factors in evaluating the blasting results and affecting the downstream mining and processing operations in open-pit mines. Image-based methods are widely applied to address the problem but require heavy user interaction and experience. This study deployed a deep learning model Mask...

In the original version of the paper, the authors used Fig. 1 to describe the study area's location.

Ulstrasonic has been popularly applied in more practical sectors, contributing to assess any issues, such as non-homogeneous, defects, without direct measures. One of these applications is for solid materials, such as rock. With the characteristics and abilities of ulstrasonic, as well as dimension stone characteristics, the author studied the appl...

Blasting is still the most popular and effective method of breaking rocks and it is widely used in mining, leveling, and building demolition. In blasting process carried out in surface mines, a series of bad impacts on environment are generated such as ground vibration, air blast, flying rock, dust and poisonous gases. The contents of the article p...

In dimension stone extraction, there have existed many block cutting techniques from intact rock or from a large block to smaller blocks such as disc sawing, chainsawing, diamond wire sawing and splitting techniques, one of which still has recently been used with the other modern methods is splitting techniques. The usage of the splitting methods h...

The prediction of fly-rock distances is a big problem in the blasting areas of open-pit mines. The fly-rock distance plays a crucial role in the reduction and control of blasting accidents in quarries. This paper proposes the modelling of the contact dynamics as a non-smooth discrete element method (NSCD). Then, the fly-rock phenomenon is simulated...

The principal object of this study is blast-induced ground vibration (PPV), which is one of the dangerous side effects of blasting operations in an open-pit mine. In this study, nine artificial neural networks (ANN) models were developed to predict blast-induced PPV in Nui Beo open-pit coal mine, Vietnam. Multiple linear regression and the United S...

With many types of trucks and shovels for hauling large volume of waste rocks to the dump sites and coal to the storages, the truck-shovel dispatching in Cao Son open pit coal mine is the operation which needs to be improved. At present, the combination between trucks and shovel is usually assigned at the beginning of shift and adjusted during the...

This study aims to take into account the feasibility of three ensemble machine learning algorithms for predicting blast-induced air over-pressure (AOp) in open-pit mine, including gradient boosting machine (GBM), random forest (RF), and Cubist. An empirical technique was also applied to predict AOp and compared with those of the ensemble models. To...

The principal object of this study is blast-induced ground vibration (PPV), which is one of the dangerous side effects of blasting operations in an open-pit mine. In this study, nine artificial neural networks (ANN) models were developed to predict blast-induced PPV in Nui Beo open-pit coal mine, Vietnam. Multiple linear regression and the United S...

With many types of trucks and shovels for hauling large volume of waste rocks to the dump sites and coal to the storages, the truck-shovel dispatching in Cao Son open pit coal mine is the operation which needs to be improved. At present, the combination between trucks and shovel is usually assigned at the beginning of shift and adjusted during the...

Ground vibration from blasting is generally controlled by reducing the explosive charge weight per delay. However, lowering explosive charge weight per delay may increase the fragmentation size of blasted material. Richards (2008) introduced a wavefront reinforcement model to account for input burden, spacing and sequential delay timing for each bl...

Estimating the cut-off grade is one the basic steps in the mining the ore body by both open pit mining or underground mining. In the prospecting stage or exploration stage, the estimation of cut-off grade is important information which is used for quickly deciding whether the content of the ore will make profit or not if it will be mined in the fut...

Quyển từ điển nhằm cung cấp cho các giảng viên, NCS, học viên cao học, sinh viên đại học của Trường Đại học Mỏ - Địa chất, các kỹ sư mỏ, các nhà môi trường, các cơ quan quản lý nhà nước trong lĩnh vực mỏ và môi trường,... các từ và thuật ngữ Anh - Việt thuộc ngành Mỏ và Môi trường. Ngoài ra, quyển sách cũng cung cấp những từ và thuật ngữ cơ bản của...

A series of single hole test blasts were carried out at Hoang Mai A limestone quarry with the aim to define optimum burden for the blasts in 5 m sub-bench height. This sub-bench height is used at edge zone of the mountain in order to reduce falling blasted rock to the side of the mountain. The results shows that the maximum broken volume minimum sp...