https://tapchi.humg.edu.vn/ojs31/index.php/jmes/issue/feed 2021-02-28T17:50:00+07:00 jmes@humg.edu.vn Open Journal Systems <p>The Journal of Mining and Earth Sciences, published by Hanoi University of Mining and Geology, is licensed by the Ministry of Culture and Communication, publishing license number&nbsp;467/GP - BVHTT&nbsp;dated October 18^th, 2002. From 4 volumes each year published in Vietnamese, since 2016 the journal has been issueing 6 volumes annualy, 2 English volumes are inclusive.</p> <p>The Journal of Mining and Earth Sciences is a multi-disciplinary journal, to publish qualified scientific works in fields of mining, earth sciences, oil and gas, mechanics, electro-electricity, automation, geodesy-cartography and land management, environment, informatics, and economic and business management.</p> <p>At present, the editorial board of the Journal is gathered of 46 prestigous scientists relevant to all fields of the Journal. Nineteen of them come from the USA, Germany, France, Norway, Poland, Rumania, Greece, Australia, Japan, South Korea, Malaysia and Thailand. Number of international potential scientists will be extended every year. Any submission is peer reviewed by regional and international standards.</p> <p>The Jounal of Mining and Earth Sciences is a prestigous scientific and technological forum for international and Vietnamese scientists to exchange and publish their research results, which are attracting the interests of scientists, authorities, academic staff, post graduates students and other students not only in Vietnam. To date, publications of the journal are listed in rewards papers of many Councils for Professorships in disciplines/multi-disciplines.</p> <p>Hanoi University of Mining and Geology aims to upgrade the Journal to join the Southeast Asian Citation Index system - ACI in the upcoming year, with support from the Ministry of Education and Training under the Decision number 201/QĐ-BGDĐT dated January 21^st&nbsp;2020.</p> https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/4 2021-02-28T08:11:00+07:00 Hung Le Trinh trinhlehung@lqdtu.edu.vn Ha Thu Thi Le trinhlehung@lqdtu.edu.vn Loc Duc Le trinhlehung@lqdtu.edu.vn Long Thanh Nguyen trinhlehung@lqdtu.edu.vn

Classification of built-up land and bare land on remote sensing images is a very difficult problem due to the complexity of the urban land cover. Several urban indices have been proposed to improve the accuracy in classifying urban land use/land cover from optical satellite imagery. This paper presents an development of the EBBI (Enhanced Built-up and Bareness Index) index based on the combination of Landsat 8 and Sentinel 2 multi-resolution satellite imagery. Near infrared band (band 8a), short wave infrared band (band 11) of Sentinel 2 MSI image and thermal infrared band (band 10) Landsat 8 image were used to calculate EBBI index. The results obtained show that the combination of Landsat 8 and Sentinel 2 satellite images improves the spatial resolution of EBBI index image, thereby improving the accuracy of classification of bare land and built-up land by about 5% compared with the case using only Landsat 8 images.

2021-02-28T08:01:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/8 2021-02-28T09:48:00+07:00 Ha Thu Thi Le lethithuha@humg.edu.vn Long Van Hoang lethithuha@humg.edu.vn Trung Van Nguyen lethithuha@humg.edu.vn

Land cover/land use classification using high spatial resolution remote sensing data has the biggest challenge is how to distinguish object classes from different spectral values based on structures, shapes, and spatial elements. This paper focuses on the object-oriented classification method to extract artificial surface at industrial area by Worldview-2 data with a spatial resolution of 1.8 m. Extraction of 05 types of land cover/land use using object-oriented classification method based on reflectance spectral characteristics, shape index, location of objects, brightness, NDVI index, and density objects are archive efficiency to the quality of classification results. The overall accuracy of classification result for land cover/land use of Thang Long industrial area is about 0.85 and Kappa index is about 0.81.

2021-02-28T09:38:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/6 2021-02-28T10:42:00+07:00 Ngoc Minh Nguyen nmngoc@sti.vast.vn Anh Van Tran nmngoc@sti.vast.vn Tuan Van Nghiem nmngoc@sti.vast.vn Huy Xuan Chu nmngoc@sti.vast.vn Thao Phuong Thi Do nmngoc@sti.vast.vn

MTF is a factor in evaluating image quality with respect to the contrast and sharpness of the payload, thus directly related to spatial resolution. Therefore, ensuring image quality is an important task, especially for small satellites with high spatial resolution. This study uses the slanted-edge method for the artificial permanent test site and VNREDSat-1 image data with spatial resolution of panchromatic band as 2.5 m to make an MTF value estimate. The MTF value during 5 years of operation averages about 0.2 compared to the threshold as 0.08 (for the test site at Salon de Provence, France, the MTF value ranged from 0.16÷0.27 in across-track direction and 0.16÷0.25 in along-track direction; and at the Buon Ma Thuot test site, these values were 0.16÷0.23 and 0.20÷0.24, the reflectivity of these two test sites are similar), proving that image quality is guaranteed throughout the design life of the satellite; moreover, they are also the basis for Vietnam to finalize regulations on validation and calibration of optical satellite systems in the future when we have own test site.

2021-02-28T10:32:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/3 2021-02-28T12:09:00+07:00 Duc Trong Tran ttduc@hcmut.edu.vn

Assigning a state price to each land parcel is a frequent and yet important task in the state management of land parcels. Land price is issued for each street. For each street, land price is divided according to level of location 1, 2, 3 and 4. Parcel is assigned to which location level depending on its walking distance to nearest street, and passed minimum alley’s width, etc. The task of valuing land parcels is cumbersome because the number of land parcels to be priced is huge. To alleviate this burden for government staff, a step by step processing model is developed to automatically determine the location level of a particular parcel. Using ArcGIS Engine library and VB.NET programming language, the steps in the proposed model are built into functions in a specialized module for land valuation. Experiment in assigning location level and land prices of Tam Hiep ward, Bien Hoa city, Dong Nai province shows that 91,73% of parcels are assigned the same location level as the location on the issued land location map. The experiment demonstrates the effectiveness and correctness of the proposed model in automatically determining location levels and corresponding prices of land parcels.

2021-02-28T11:59:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/5 2021-02-28T13:01:00+07:00 Khanh Quoc Pham phamquockhanh@humg.edu.vn

The paper represents the hypothesis test method that can determine the instability control points of the reference network in the displacement of construction. Regarding data processing in displacement monitoring, the detection and modification for instability points is an important task because this affects the computation of the displacement of monitoring points. This method has been applied in many countries over the world but not in Vietnam, and it is processed through two steps including the global statistics test and local statistics test. The global statistics test is to identify whether a control point is stable or not. The local statistics test based on the division of groups is to find the unstable control points exactly. Experimental computation is carried out in two monitoring cycles at Hoa Binh hydroelectric plant. In this experiment, this algorithm detected two unstable points among six control points. This result is in agreement with the result that is solved by Vietnam’s construction standard of TCVN 9399:2012. In conclusion, the hypothesis test method completely can apply in real geodetic production in Vietnam.

2021-02-28T12:51:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/7 2021-02-28T13:45:00+07:00 Dung Mai Thi Nguyen nguyenthimaidung@humg.edu.vn Thu Hoai Thi Vu vuthihoaithu@humg.edu.vn

Spatial big data has a large scale and complex, therefore, it cannot be collected, managed, and analyzed by traditional data analytic software shortly. These platforms in many situations are restricted to vectors data. However, the raster data generated by the sensors on the enormous number of satellites now needs to be processed in parallel on the cluster environment. The article introduces the satellite image data analyzing method using the RasterFrames library on the Apache Spark platform. The RasterFrames library examines raster data for Python, Scala, and SQL, bringing the power of Spark DataFrames to access to Earth Observation, cloud computing, and data science. In the experimental part, the NDVI and the change in the average value of NDVI in the time series are calculated to demonstrate the vegetation mantle changes in Phu Tho province. These results are the reference data source in the assessment of weather, climate, and environmental changes in the study area during that time.

2021-02-28T13:35:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/12 2021-02-28T14:46:00+07:00 Nguyen Duc Do nguyen180@gmail.com Niem Van Nguyen nguyen180@gmail.com Thanh Hung Pham nguyen180@gmail.com Hieu Cong Duong nguyen180@gmail.com Tan Trong Bui nguyen180@gmail.com Linh Thuy Thi Hoang nguyen180@gmail.com Tien Cong Dinh nguyen180@gmail.com Thoa Thi Hoang nguyen180@gmail.com

Oxidation-reductionstate of magma in general and granitoid in particular is important for determining themetallogenetic potential of magma bodies. Redox conditions help to interpret the specialized chemistry of geochemistry not only at the content level, but also on the geochemical behavior of the elements. The research on primary inclusions of magma by hermobarogeochemical method of RAMAN equipment has identified that Ngoc Tu granitoid block is in the oxidized state indicated by CO2-rich primary inclusions. This condition shows that the Ngoc Tu granitoidblock is not favorable for the metalogical potential of Sn, but it can be advantageous for the movements of Mo, W from magmatic solution into ore solution.

2021-02-28T14:36:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/13 2021-02-28T15:41:00+07:00 Hau Vinh Bui buivinhhau@humg.edu.vn Hai Thanh Tran buivinhhau@humg.edu.vn Thanh Xuan Ngo buivinhhau@humg.edu.vn Chi Kim Thi Ngo buivinhhau@humg.edu.vn

The garnet-bearing schists of the Nam Co formation have an identical mineral assemblage consisting of garnet, chlorte, albite, quartz and muscovite, together with accessory apatite, zircon, monazite, xenotime, and ilmenite. An aggregate of muscovite and chlorite defines the major foliations (Sn). Both albite and garnet occur as a porphyroblast, ranging in size 0.2÷1 mm and 0.5÷1.2 mm, respectively. Albite porphyroblasts commonly have the curved to sigmoidal inclusion trails defined by graphitic materials (Sn-1). Garnet porphyroblasts in the sample is generally characterized by paucity of inclusions and retrograde corona of bitotite and chlorite. Garnet also occurs as an inclusion within albite porphyroblast. Porphyroblastic garnet shows the compositional zonation typified by a bell-shaped spessartine profile balanced by increasing almandine from core to rim. Whereas, inclusion garnet is homogeneous compositions with rich in almandin and poor in spessatin, pyrop and grossula. All the above microstructures suggest two deformation and metamorphic stages (M1 and M2) that were affected to politic rocks of the Nam Co formation, Song Ma suture zone.

2021-02-28T15:31:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/11 2021-02-28T16:12:00+07:00 Lam Tang Van lamvantang@gmail.com Dien Vu Kim kimdienxdtb@gmail.com Hung Ngo Xuan xuanhung1610@gmail.com Bulgakov Boris Igorevich lamvantang@gmail.com Chien Minh Do lamvantang@gmail.com Duong Van Nguyen lamvantang@gmail.com

This study uses the mathematical method of two-factors rotatable central compositional planning to predict and simulate the effect of the ratio of water-cement (N/X) and sand - binder (C/CKD) as the input parameters on the objective functions of the spreading flow of concrete mixtures and the compressive strength of fine-grained high-performence concrete (FGHPC) at 28 days. Results of the study showed that, from the material source in Vietnam, it is possible to FGHPC with a flow of 18.5 cm in the mini cone, its compressive and flexural strengths at the age of 28 days are 68.5 MPa and 6.13 MPa, respectively. Furthermore, from the obtained objective functions, it has been shown that the both two-input parameters have a significant influence on the values of the experimental models. Particularly, using Matlab software is showed the expression surface, the contour line of the experimental models, and determined the maximum value of compressive strength of FGHPC at this age of 69.84 MPa at N/X=0.326 and C/CKD=1.315. The contribution of this study is to obtain regression functions to predict the mechanical-physical properties of FGHPC that will be used in the next in-depth studies.

2021-02-28T16:02:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences https://tapchi.humg.edu.vn/ojs31/index.php/jmes/article/view/15 2021-02-28T17:50:00+07:00 Nhan Thi Pham phamthinhan@humg.edu.vn Nghia Viet Nguyen phamthinhan@humg.edu.vn

Due to the effects of dynamic pressure, the stress distribution of rock mass is very complex. The reason for this could be a risk of stability loss for an auxiliary tunnel system constructed within the study area. In this article by using Flac3D software the author simulated two adjacent working faces with the thickness of 5 m natural coal pillar. Three factors: the upper working face excavation process, auxiliary tunnel mining process, and the location of lower working face, affected by deformation, stress distribution, safety of lower floor area and surrounding rock mass of tunnel. The research results show that during the excavation, the mechanical behavior of the rock mass surrounding the auxiliary tunnel showed displacements, volatility, and phase characteristic. The displacement on the auxiliary tunnel boundary in both excavation and working face cases showed that the roof and the left side wall displacement was greater than the right side wall and the bottom. Therefore, the distance between the auxiliary tunnel and the empty mining space needs to be computed to meet technical and economic requirements.

2021-02-28T17:40:00+07:00 Copyright (c) 2021 Journal of Mining and Earth Sciences