Hanoi University of Mining and Geology (HUMG, Vietnamese: Trường Đại học Mỏ - Địa chất Hà Nội) is a university in the Bắc Từ Liêm district of Hanoi, the capital of Vietnam. It trains technical experts in exploration and exploitation of natural resources; in protection of mining and the geological environment; and to be a center for research and technology transfer in geology, oil and gas, surveying, and mining. Higher education is also provided in theoretical sciences, information technology and economics and business administration.HUMG has three campuses: Hanoi (main campus), Quảng Ninh, and Vũng Tàu..
This study investigates drought conditions in Vietnam and its seven sub-climatic regions using the Standardized Precipitation-Evapotranspiration Index (SPEI). SPEI was derived from daily, high-resolution (10-km) precipitation and temperature products from the CMIP6-VN dataset, which statistically downscaled CMIP6 global models. Performance evaluation of 22 CMIP6-VN models confirmed their accuracy in representing precipitation and temperature characteristics for the reference period (1985–2014). Regarding the future period (2015–2099) under three Shared Socioeconomic Pathways (SSPs) (SSP1-2.6, SSP2-4.5, and SSP5-8.5), significant warming is projected across Vietnam, while precipitation projections remain uncertain, with most areas anticipated to experience slightly increased rainfall. SPEI results indicate that precipitation significantly influences drought conditions more than temperature, accounting for approximately 75
The Tam Ky-Phuoc Son Ophiolite (TPO) in central Vietnam preserves evidence of Early Paleozoic evolution along the eastern Indochina margin. However, the mantle section represented by the Hiep Duc peridotites remains poorly constrained. New petrographic and geochemical data from the serpentinized peridotites and associated dunites show high-Fo olivine (Fo(9)(2)-(9)(3)), high-Mg clinopyroxene (Mg# = 91-93), and chromian spinel with high Cr# (0.45-0.68 in harzburgite; 0.67-0.80 in dunite) and very low TiO2 (<0.33 wt%), indicating a highly depleted mantle source. Whole-rock compositions are characterized by high Mg#, low CaO, Al2O3, TiO2, Nb depletion, and U-shaped REE patterns, consistent with high degrees of partial melting (similar to 18-30%) followed by melt-mantle interaction. The peridotites record interaction with hydrous boninitic melts infiltrating a previously depleted mantle wedge, locally forming podiform dunite through reactive porous flow in a fore-arc setting. Variations in spinel chemistry distinguish two evolutionary stages: GI harzburgites representing residues formed during subduction initiation, and GII harzburgites-dunites reflecting interaction with progressively oxidized melts during fore-arc development. Equilibrium temperatures (1160-1318 degrees C) and oxygen fugacities (QFM-0.04 to QFM + 1.27) further document progressive mantle oxidation under elevated thermal conditions, marking the transition from nascent subduction to a mature fore-arc regime.
The utilization of agricultural waste materials as soil stabilizers has recently received much attention due to their environmental and economic benefits. This study explores the potential of the incorporation of rice straw ash (RSA) with cement for soil stabilization in the Mekong Delta, Vietnam, where many soft soil types and an abundant source of RSA are present. The objective of the study was to investigate the unconfined compressive strength (UCS) of soil stabilized by cement and RSA. Additionally, scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to analyze the microstructure of the stabilized soil. The research findings revealed that RSA can significantly enhance the UCS of soil–cement mixtures. Besides enhancing strength, RSA can be an alternative to replace 10
To investigate the dynamic failure behavior of anchored rock mass in complex geological structures, this work performed dynamic loading tests on anchored unit cells containing different structural planes (bedding and fracture surfaces). A coupled finite difference-discrete element numerical simulation was further employed to examine the effects of structural planes on the dynamic response of the specimens from both the surrounding rock and bolt perspectives, and to elucidate the failure mechanisms of the anchoring system. The main conclusions are as follows. Fracture surfaces play a dominant role in controlling the loading rate, peak load, and energy dissipation of the anchored units, and this effect is negatively correlated with Joint roughness coefficient (JRC). The peak load of anchored units containing a rough fracture surface (JRC =16) reaches 74.69% of that for intact specimens, whereas that of units with a smooth fracture surface (JRC = 0) is only 22.58%. The propagation path of the disturbance stress wave is jointly governed by the fracture surface (primary) and bedding planes (secondary), with the most pronounced wave deflection occurring at the fracture surface. Bedding angle influences crack propagation by modulating wave velocity and reflection paths. Secondary cracks preferentially develop along bedding planes, and the dominant failure modes of both the anchored unit and the bolt are primarily controlled by fracture-surface characteristics. These findings improve the understanding of dynamic instability mechanisms and provide support for anchoring system design.
This study explores influence of dicalcium silicate (C2S) and limestone powder (LP) contents on the interfacial bond characteristics of smooth and hooked steel fibers embedded in low-carbon mortars. Four mortar compositions with varying LP (0-30%) and C2S (16.4-57.2%) contents were evaluated through single-fiber pullout, compressive tests, SEM-EDS, and nanoindentation (NI) analyses. A mixture containing 10% LP substitution in belite-rich cement (BRC) exhibited optimal performance and sustainability. Although increased C2S content in BRC reduced early-age strength, it significantly enhanced the long-term mechanical and interfacial properties and improved the 90-day compressive strength, bond strength, and pullout energy by up to 65%. Higher LP levels yielded denser fiber-matrix interfacial zones (FMZs) and reduced porosity (25.0%-*18.9%), while elevated C2S promoted greater C-S-H formation (34.6%-*51.5%). The optimized LP-BRC system demonstrated superior durability and interfacial performance with substantially lower CO2 emissions, offering a viable and sustainable alternative to ordinary Portland cement (OPC).
