The effect of oxygen supply and oxygen distribution on single-head tunnel with different altitudes under mixed ventilation

Hypoxia plays a major role in limiting the construction of the high-altitude mine. Understanding the effect and the distribution of diffused oxygen supply at different altitudes is the premise for the design of a mine with oxygen supply system and the full utilization of oxygen resources. For the optimal design of an oxygen supply mode and ventilation system, a multi-component fluid model of the diffused oxygen supply of a single-head tunnel was developed. This study reveals the variation law of the average oxygen mass fraction at different altitudes. The relationship between the distance from the heading face and the oxygen mass fraction at each altitude was fitted. The results show that the distribution of oxygen mass fraction in a single head tunnel at different altitudes presents a similar trend of increasing first and then decline. In addition, the change of the average oxygen mass fraction with the increase of altitude is not linear, and the dispersion loss is larger in high-altitude areas. The largest oxygen enrichment area is distributed at the altitudes of 4000–4500 m. This study provides theoretical support for improving the hypoxic environment of high-altitude metal mines excavation work.

New Archaeological Discoveries: Gates and Turrets of 16th century Burmese Royal Capital of Haṁsāvatī | ရှးေ ရောငး် သရု ေသနဆငုိ ှ် ာရေ့ေ ှခိေ ျကအ် သစမ် ျား - (၁၆) ှာစ ုလကှ် ာ ေသံ ာဝေမီ မုိ ့ရောမ် ေေခံ ါးရေါကန် ငေ ပ့် ေအးုိ များ

This paper explores the styles of construction and the city features of the sixteenth century royal capital of Haṁsāvatī, located in Bago, Myanmar. It was founded by King Bayinnaung in 1566 CE. Throughout its existence, the ancient city has been devastated by natural disasters, weak heritage conservation policies, and urban encroachments. Starting from 2018, excavation work on Haṁsāvatī wall was started and research was carried out on up to four excavation mounds. Archaeological excavations have revealed a wealth of evidence on architecture, including the city walls, gateways, and turrets. This research examines the architectural elements found during the excavations of the Haṁsāvatī wall, construction techniques, renovations and destructions throughout centuries. New hypotheses and discoveries from excavations, cross-examinations with historical records will also be presented. ဤစာတမ်းငယ်သည် မမန်မာနိုင်ငံ၊ ပဲခူးမမို့တွင် တည်ရှိသသာ (၁၆) ရာစုနှစ်လက်ရာ ဟံသာဝတီမမို့သတာ်၏ တည်သောက်မှုပုံစံနှင့် မမို့မပအင်္ဂါရပ်တို့ကို ရှာသွွသွာ်ထုတ်ထားပါသည်။ ဤမမို့သတာ်ကို ဘုရင့်သနာင်မင်းတရားကကီးက သအဒီ (၁၅၆၆) တွင် စတင်တည်သထာင်ခဲ့မခင်းမွစ်သည်။ ရာဇဝင်နှင့်မှတ်တမ်းများအရ မမို့သဟာင်းသည် သဘာဝသဘးအန္တရာယ်၊ ထိန်းသိမ်းမှုမူဝါဒညံ့ွျင်းမှုများနှင့် မမို့မပကျူးသကျာ်မှုများကို တည်ရှိလာသည့်ကာလတစ်သလှောက် များစွာခံစားခဲ့ရသသးသည်။ (၂၀၁၈) ခုနှစ်မှ စတင်၍ ဟံသာဝတီမမို့သဟာင်းတူးသွာ်မှုလုပ်ငန်းများကို စတင်နိုင်ခဲ့မပီး လက်ရှိအချနိ ်အထိ တူးသွာ်မှုကုန်းသလးခုအထိ သုသတသနမပုလုပ်နိုင်ခဲ့မပီးမွစ်ပါသည်။ မမို့ရိုး၊ မမို့တံခါးသပါက်၊ မပအိုးအစရှိသည့် များစွာသသာ ဗိသုကာေိုင်ရာအသထာက်အထားများကိုလည်း သရှး သဟာင်းသုသတသနေိုင်ရာတူးသွာ်မှုများမှတစ်ေင့် သွာ်ထုတ်နိုင်ခဲ့မပီးမွစ်ပါသည်။ ယခုသုသတသနသည် ဟံသာဝတီမမို့ရိုးတူးသွာ်မှုမှ သတွ့ရှိရသည့် ဗိသုကာေိုင်ရာ အင်္ဂါရပ်များ၊

Experimental determination of the critical depth of cutting of blocked soil cutting by cutters and the length of the ploughshare of chain excavators

The development of civil and industrial construction and the growing trend of construction of underground communications have led to an increase in the volume of work on the laying of gas and oil pipelines, water mains, sewerage systems, power cables and communication cables. Much of the excavation work in the construction of these communications is performed by trench excavators.

Archaeological Evidence of the Relationship of the Cimmerians with the Phrygian and Lydian Kingdoms in the 7th c. B.C.

В статье предпринята попытка обзора результатов раскопочных работ последних десятилетий, связанных с активностью киммерийцев в центральной и за- падной Малой Азии. Несмотря на то, что недавние исследования ставят под сомнение некоторые сообщения античных авторов о роли киммерийцев в военно-политических процессах в регионе в VII в. до н. э., в частности факт захвата и разрушения ими Гордио- на, выявленные к настоящему времени во фригийских и лидийских центрах артефакты в сочетании со следами интенсивного фортификационного строительства указыва- ют на критическую важность кочевнического фактора и серьезность созданной им для местных цивилизаций угрозы в рассматриваемый период. The article attempts to review the results of excavation work of recent decades related to the activity of the Cimmerians in central and western Asia Minor. Despite the fact that recent studies cast doubt on some reports of ancient authors about the role of the Cimmerians in the military and political processes in the region in the 7th c. B.C., particularly the fact of the capture and destruction of Gordion by them, artifacts found to date in the Phrygian and Lydian centers in combination with traces of intensive fortifi cation construction indicate the critical importance of the nomadic factor and the seriousness of the threat it created for local civilizations during the period under review.

Pelatihan Perencanaan Optimalisasi Sistem Lahan Pertanian Masyarakat Desa Kramat Kabupaten Lamongan

Reservoir is a container or place for storing raw water, which will later be used as a temporary water storage area, then used as a place for water treatment for the continued growth of rice plants. In addition to rice plants, reservoirs are also used to minimize drought disasters in the dry season. The construction of this reservoir will be used by the Kramat village community to improve the economy in two sectors, namely agriculture and village potential, Kramat village itself is one of the villages in Lamongan Regency which has an area of ​​194.80 hectares and is located in Lamongan sub-district which has a population of 2,012 people. Most of their livelihoods are farmers. Seeing such conditions, farmers need facilities to help meet the needs of raw water for their agricultural land which will be planned with the planning method carried out by the construction of the reservoir with various stages such as measuring with 2 methods, either surveying in the field or utilizing digital applications or software using fields area or Google earth, after finding the size, then we can determine the sketch of the image on the reservoir by drawing in AutoCAD software. The area of ​​land used for the construction of the reservoir has an area of ​​1,452.03 m2, which is later estimated to be able to accommodate 8,507,190 L of water. The total volume of excavation work is 8,507.19 m3 with an estimated work period of 23 days. Excavator pc 200 heavy equipment operational cost : Rp. 101.200.000 per 23 days and for Dump truck capacity of 8 m3: Rp. 2,400,000 (2 dump trucks) per day.

EXPERIENCE OF THE FIRST GEORADAR RESEARCH ON THE TERRITORY OF THE DNU PALACE OF STUDENTS OF THE CENTRAL PARK OF CULTURE NAMED AFTER T.G. SHEVCHENKO IN DNIPRO

Problem statement. Geophysical research at the location of the Palace of Students of DNU (formerPotiomkin Palace) in the Central Park of Culture. T.G. Shevchenko city of Dnipro were held in connection with theissue of the existence of hidden underground structures and confirmation of the historical legend, long existing aroundthis monument of architecture of the XVIII century. In the course of the research, a georadar survey was carried out,which involved a careful analysis of historical sources, which should refute the legend or, conversely, confirm it. Thestudies were performed using MALA georadar with operating frequencies of 250 MHz and, 800 MHz (very limitedly).Purpose of the article. The purpose of the work was to clarify the state of existing utilities, as well as the search forhidden ancient structures in the Central Park of Culture. T.G. Shevchenko in the areas adjacent to the building of the thePalace of Students of DNU. The research was also carried out on Shevchenko Square (formerly called Palace Square)near the central entrance to the park. Conclusion. As a result of the conducted researches of the received georadarprofiles features of display of superficial and deepened building designs, aquifers and other communications on sites ofdry and moistened loess soils of the given territory were revealed. In the areas of possible leaks in moist loam soils, anyobjects, at working depths at a frequency of 250 MHz by the device, were not reflected due to the high degree of signalattenuation. When deciphering the radar patterns on Shevchenko Square, the excavation work carried out for thereconstruction of the area proved to be a significant help. No anomalies indicating the presence of sufficientlyvoluminous linear underground structures were found on the georadar profiles of this area, which is confirmed by theresults of photofixation during excavation. The conducted researches can be considered only primary and providecarrying out of further more detailed researches on the chosen sites, including in the building. As information onpreviously performed georadar surveys on the territory of the Palace of Students of DNU and adjacent to the park −Shevchenko Square could not be found, the conducted Laboratory of research of nuclear and thermal power plants PSACEAsurveys can be considered the first of its kind.

Calculation of the Amount of Work on a Typical Technological Parking Area Lot of an Excavator for Building an Information Model

Постановка задачи. Построение информационных моделей строительных процессов невозможно без точного вычисления объема работ, выполняемого на типовой технологической стоянке (захватке). Цель работы состоит в разработке системы автоматизации вычислительных процедур, применяемых при определении объема земляных работ на типовой технологической стоянке экскаватора, которая используется в 4D- и 5D-BIM-моделях. Результаты. Получены аналитические уравнения для вычисления объема земляных работ на одной технологической стоянке экскаватора с учетом технических характеристик землеройных машин, а также условий производства работ (категорий грунта по величине угла внутреннего трения). Выводы. Аналитические зависимости объема работ на одной типовой технологической стоянке экскаватора от технических характеристик и условий производства работ (категорий грунта) могут применяться для формирования процедур автоматического вычисления объема работ, продолжительности и стоимости устройства котлованов. Величина объема работ на одной технологической захватке может применяться для формирования, оценки и выбора траектории движения экскаватора при устройстве котлована. Statement of the problem. The construction of information models of construction processes is impossible without an accurate calculation of the amount of work performed on a typical technological parking lot (gripper). The aim of the work is to automate the computational procedures used to calculate the amount of excavation work on a typical technological excavator parking lot, which is used in 4D and 5D BIM models. Results. Analytical equations are obtained for calculating the volume of earthworks at one technological site of an excavator, taking into account the technical characteristics of earthmoving machines, as well as the conditions of work (the category of soil according to the value of the internal friction angle). Conclusions. The analytical dependences of the volume of work on one typical technological site of an excavator on the technical characteristics and operating conditions (the category of soil) can be used to form procedures for automatically calculating the volume of work, the duration and cost of the construction of pits. The amount of work on a single technological gripper can be used to form, evaluate and select the trajectory of the excavator during the construction of the pit.

Strength and Road Performance of Superabsorbent Polymer Combined with Cement for Reinforcement of Excavated Soil

The process of road construction is often accompanied by a large number of excavation work, and most of the excavated soil has poor engineering performance and needs to be transported away. It has the significance of environmental protection and cost saving to treat the excavated soil as pavement materials. The aim of this study is to present laboratory experiments into the mechanical properties, engineering properties, and microstructure of excavated soil stabilized by ordinary Portland cement (OPC) and superabsorbent polymer (SAP). Laboratory experiments were performed to determine unconfined compressive strength (UCS), compactness, durability after wetting and drying cycles, drying shrinkage, and California bearing ratio (CBR). Apart from these, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for the microstructure analysis to understand the impact of SAP on cemented excavated soil. It shows that SAP can effectively improve the strength and the compaction of cemented excavated soil with good durability. Although SAP will reduce the CBR value of cemented excavated soil, it still meets the requirements of engineering acceptance. Microscopic analysis shows that SAP absorbs water in the cemented excavated soil and plays a filling role.

Exploring the Gains of Artificial Intelligence for Addressing the Menance of Pipeline Vandalization in Nigeria: A Review

Pipeline transport is a commonly utilised method for moving petroleum products from one location to another. It is considered as one of the safest, fastest, and most reliable options for transporting petroleum products. However, the use of pipelines for oil transport is associated with the risk of pipeline failure, a challenge caused by a range of factors including corrosion, ignition of natural gas, accidental damage during excavation work, lapses in maintenance as well as vandalization. Most prevalent in Nigeria is the menace of pipeline vandalization and oil thefts which is a critical factor responsible for most pipeline failures across the country. Varied efforts aimed at addressing the problem of vandalization and oil thefts in Nigeria have, over the years, yielded minimal benefits. Therefore, this review investigates the usefulness and suitability of artificial intelligence (AI) for securing Nigeria’s pipeline network. The review focuses on summarizing available evidence on the use of some relevant AI components such as Image Analytics, Convolutional Neural Network (CNN) as well as Edge-Based AI Solutions, for securing oil pipelines. Based on the findings of case studies and other primary research materials utilized in this review, this paper concludes that while there is need for further research on the subject, AI offers a promising and useful solution to Nigeria’s endemic challenge of pipeline vandalization and oil theft. This is as AI promotes early detection of illicit activities on pipelines and can relay signals to appropriate authorities on the need for urgent action. The use of AI in securing Nigeria’s vast pipeline network will not only minimize the economic losses caused by vandalization but will equally contribute towards mitigating the adverse environmental impact of oil pipeline vandalization in Nigeria.