Engineering Commons^™

Dynamic Prediction Method Of Tunnel Water Inflow Based On Detailed Depiction Of Complex Geological Bodies, Du Yajun, Li Qingbo, Wan Weifeng, Yang Fengwei, Li Yazhe, Qian Hui

Coal Geology & Exploration

It is a challenge to accurately characterize the irregular geological bodies and underground structures such as inclined faults and inclined tunnels during the numerical simulation of tunnel water inflow prediction, and the prediction generally assumes that the tunnel excavation is completed instantaneously without considering the construction progress. A dynamic prediction method for tunnel water inflow based on precise characterization of complex geometric bodies was proposed by addressing the non-self-intersection and watertight issues required in the coupling process of three-dimensional (3D) geological models and 3D groundwater numerical models. Specifically, a sealed boundary interface of inclined tunnels, shafts, inclined faults and irregular …

Characteristics And Genetic Mechanism Of Low Sulfate In High-Salt Groundwater Of Permian Sandstone In Fudong Mining Area, Huainan, Jiang Chunlu, Huang Wendi, Fu Xianjie, Zheng Liugen, Cheng Shigui, Shan Chonglei

Coal Geology & Exploration

Hydrogeochemistry research of groundwater in coal mining areas is of great significance to the prevention and control of mine water and the comprehensive utilization of water resources. In terms of the low surfate of Permian sandstone water in Fudong mining area, Anhui Huainan Coalfield, the hydrochemical characteristics, water-rock interaction and low sulfate genesis of sandstone water were studied through water sampling and test by multivariate statistical method, in combination with the hydrogeological condition analysis and the sulfur and oxygen isotope technology. The results show that the Permian sandstone water in the study area is weakly alkaline, with an average TDS …

Evaluation Of Water Quality And Identification Of Pollution Factors In Mining Subsidence Area With High Phreatic Water Level, Hu Lin, Chen Yongchun, Xu Yanfei, Li Bing, Wang Jin, An Shikai, Chen Chen, Sun Hongjie, Miao Wei

Coal Geology & Exploration

Huainan mining area is characterized by a high phreatic water level, as well as a wide range and large area of coal mining subsidence areas, with the water quality monitoring data missing and prominent water environment. Therefore, the evaluation of water quality monitoring and identification of pollution factors in large subsidence area is of great significance to regional water environmental governance. Specifically, the water quality of the subsidence area was evaluated with the Nemerow pollution index method by testing the water samples collected from 175 sampling points in the study area. Meanwhile, the eutrophication state of water bodies was evaluated …

A Method For Evaluating Aquiclude Stability In The Water Conservation-Based Mining Of Shallowly Buried Coal Seams In Ecologically Vulnerable Areas In Northwest China, Li Heng, He Tao, Guo Bin

Coal Geology & Exploration

Water conservation and coal mining are both critical to Northwest China. Water conservation-based coal mining is an important technology for the coordinated development of coal and water resources in this region. In this technology, the evaluation of aquiclude stability is critical. Due to the shallow depth of coal seams, intense topographic cutting, and complex changes in near-surface aquifers in the ecologically vulnerable areas in Northwest China, there exist large errors between traditional methods for aquiclude evaluation and the actual hydrological observations in these areas. To address this challenge, this study develops using the 3D geological modelling combined with numerical simulation …

Micp Restoration Law Of Coal Mining Induced Ground Fissures And Its Influencing Factors, Li Tao, Gao Ying, Yan Jingwang, Zhang Jiarui, Kou Guigui, Ma Tengfei, Mei Aoran

Coal Geology & Exploration

The coal mining induced ground fissures in the loess covered area of northwest China cause shallow groundwater resource leakage and soil instability. Therefore, the experimental study was conducted on Microbial Induced Carbonate Precipitation (MICP) restoration of coal mining induced ground fissures in the loess covered area. Specifically, the characteristics of mining induced ground fissures were observed and their development characteristics were revealed based on Ningtiaota Coal Mine in northern Shaanxi. The coal mining induced ground fissures in loess were classified with consideration to the observed mine pressure. Based on the classification and characteristics of coal mining induced ground fractures, the …

Experimental Study On Proportioning Of Ultra-High Strength Similar Materials For Large Similarity Ratio Model Tests, Zhan Xinyu, Gao Lin, Zhao Fanghao, Wang Yongyin, Liu Ping, Han Sen

Coal Geology & Exploration

Similar simulation of physical material is a common research method in the field of geotechnical engineering. Selecting appropriate similar materials and determining their proportions is the key to successfully simulating the prototype project. Existing similar materials are mostly developed for similar simulation with small geometric similarity ratio (1∶250-1∶25). These materials generally have low strength (0.2-7.6 MPa), making it difficult to meet the requirements of large similarity ratio model. Therefore, in order to prepare an ultra-high strength similar material with a strength of more than 10 MPa suitable for large similarity ratio model, river sand, barite, gypsum, and cement with different …

Mechanical Properties And Strength Deterioration Mechanism Of Soil In Inner Dump Of Open-Pit Coal Mine Under The Action Of Freeze-Thaw Cycles, Zhang Heyong, Wang Xuedong, Zhu Yongdong, Wang Haipeng, Qi Lihui

Coal Geology & Exploration

In order to investigate the influence mechanism of freeze-thaw cycles on the structure and mechanical properties of soil, the typical clay soil in the inner dump of Yuanbaoshan open-pit coal mine in Inner Mongolia was taken as the research object, and the simulation analysis of the internal temperature, moisture and stress fields of the soil was carried out through laboratory freeze-thaw cycle tests and MatDEM numerical simulation. The results show that: freeze-shrinkage occurs to the soil in the dump after the freeze-thaw cycles, and the stress-strain curve shows the trend of strain softening at low confining pressure for shear failure, …

Detection Of Small Objects In Open-Pit Coal Mine Stopes Using Uav Remote Sensing Images, Liu Mingrui, Che Ben, Dong Hongbo, Zhu Ruoli

Coal Geology & Exploration

Open-pit coal mine stopes witness frequent vehicle accidents due to their complex terrains. Therefore, accurately positioning vehicles in the stopes is critical to safe coal mining. To overcome the inaccurate positioning of small targets in the mining areas using Unmanned aerial vehicle (UAV) remote sensing images, this study proposed an improved YOLOv7 model for object detection. First, to expedite the reasoning of the YOLOv7 network, the ELAN module in the original YOLOv7 model was improved by introducing partial convolution. Based on this, the eSE channel attention mechanism was combined to form the PConv-eSE convolution attention module. The purpose is to …

Intelligent Optimization Method For Tunnel Rotary Drilling Based On Drill String Status Estimation, Yao Ningping, Wei Hongchao, Zhang Jinbao, Lu Chengda, Li Hao, Yao Yafeng, Ke Yougang, Zhang Youzhen

Coal Geology & Exploration

To address the issue in existing research where it is difficult to obtain bottom-hole drilling parameters while drilling, and to overcome the problem of low accuracy and insufficient improvement when optimizing rotary drilling operational parameters using only borehole data, an intelligent optimization method for near-horizontal tunnel rotary drilling based on drill string status is proposed. This involves constructing an in-hole state observer to estimate bottom-hole drilling parameter information. Firstly, the characteristics of rotary drilling in underground coal mine tunnels are analyzed, considering the constraints of actual drilling, and an optimization target evaluation method for mechanical drilling speed and drill bit …

Obstacle-Avoidance Trajectory Planning Of Mine Drilling Robot During Drill Pipe Loading And Unloading, Yao Yafeng, Yao Ningping, Peng Tao, Liang Chunmiao, Peng Guangyu

Coal Geology & Exploration

The position of drill pipe loading and unloading by mine drilling robot will change with the attitude adjustment of the host machine, and obstacles are present in the loading and unloading path of drill pipe. Therefore, there is a problem of obstacle-avoidance trajectory planning with variable targets in the loading and unloading of drill pipe. For this reason, the DH parameter table was created according to the performance parameters of the explosion-proof 6-DOF manipulator, and the function relation of the change in loading and unloading position of drill pipe before and after the attitude adjustment of the 3-DOF host machine …

Rate-Of-Penetration (Rop) Prediction Model Based On Formation Characteristics Of Extremely Thick Plastic Mudstone In South China Sea, Zeng Xiaolong, Li Qian, Wei Hongchao, Chen Jiahao, Zhu Haiyan

Coal Geology & Exploration

In terms of petroleum and gas resources, South China Sea is the important energy replacement area in China. However, most of the reservoirs are buried deep, and the strong plasticity of the formation under high confining pressure and the complex geological environment seriously affect the drilling efficiency. It is also very difficult to accurately predict the ROP. Hence, a set of intelligent ROP prediction model was established for the extremely thick mudstone formation with unique viscoelastic and strong plastic characteristics in South China Sea. The model took the actual data of 10 wells in an area of South China Sea …

On-Line Compensation For Geomagnetic Error While Drilling Based On Magnetic Inertial Slime Mould Algorithm, Yang Jinxian, Cai Jipeng

Coal Geology & Exploration

In response to the serious distortion of the azimuth angle of the drilling tool caused by the large measurement error of strap-down micro-electro-mechanical-system (MEMS) magnetometer on the drilling tool in the measurement-while-drilling (MWD) environment, an online compensation method for the geomagnetic error of the drilling tool based on the magnetic-inertial slime mould algorithm (MISMA) was proposed. Firstly, the geomagnetic measurement error compensation model of the drilling tool was established through the analysis on the output error of the magnetometer, and the magnetometer error parameters were sorted into solution vectors. Then, the objective function of the ideal magnetic output data, the …

De Las 7 Bolas De Dragón A Los 7 Reinos De Poniente: Viajando Por La Ficción Para Transformar La Realidad, Vania C. Tovilla

Journal of Roleplaying Studies and STEAM

resumen

El libro es una muestra de la experiencia y dedicación que tiene Issac Pérez López, quien con más de veinte años de práctica en la creación de entornos lúdicos nos sumerge en una suerte de juego donde al leer sus páginas a través de un lenguaje coloquial y cercano. . a la realidad de los docentes del “Cole” nos ejemplifica y ayuda a comprender un poco más los conceptos y pasos que involucran el término “gamificación”.

Podría ser considerado un libro de autoayuda potenciado (en el buen sentido) para los docentes que se están integrando al mundo de los …

Editorial - Sangre, Sudor, Lágrimas Y Burocracia, Mauricio Rangel

Journal of Roleplaying Studies and STEAM

Estamos muy contentos con la edición de este tercer número del Journal of Roleplaying Studies and STEAM, en primer lugar porque ¡ya contamos con ISSN!, suena a un logro menor pero debemos considerar los vericuetos burocráticos por los que hemos pasado semana tras semana para lograrlo.

Aprendizaje Situado En Mundos Virtuales, Una Experiencia De Participación A Través De Juegos De Rol., Vania C. Tovilla Mgtr.

Journal of Roleplaying Studies and STEAM

En tiempos actuales el uso de las tecnologías y la comunicación masiva se hace cada vez más frecuente, ya sea por medio de Internet, los teléfonos inteligentes y otros instrumentos que quizás resignifican el modo en el que los jóvenes en la actualidad conciben términos como virtualidad, aprendiendo y sobre toda la realidad, relacionándose con otros alrededor de todo el mundo. Es quizás por este auge de tecnologías que surgió en el año 2003, la herramienta virtual Second Life ; concebida como un mundo complejo y completamente virtual que permite a los usuarios aprender y vivir en otra realidad como …

Deep Multi-Stage System For Liver And Lesions Segmentation Using Ct Images, Nermeen Elmenabawy, Mervat El-Seddek, Hossam El-Din Moustafa, Ahmed Elnakib

Mansoura Engineering Journal

Accurate tumor segmentation plays a pivotal role in cancer diagnosis and treatment planning. This study introduces an automated system for segmenting liver and tumors in CT images through a multi-stage process. Initial preprocessing improves image quality, followed by feature extraction using pretrained VGG16-Segnet and FCNAlexnet models. Outputs from both models are combined using a parallel fusion operation. Finally, pixel-wise classification designates pixels as liver, tumor, or background. Evaluation on the MICCAI'2017 LiTS database yielded a Dice coefficient of 95.3% for liver and 78.1% for tumors using 5-fold cross-validation. Comparative studies highlight the superior accuracy of our approach in liver and …

A New Algorithm For Encounter Generation: Encounters From Actual Trajectories (Enact), James Anthony Ritchie Iii

Theses and Dissertations

There is ongoing research at the Federal Aviation Administration (FAA) and other private industries to examine a concept for delegated separation in multiple classes of airspace to allow unmanned aircraft systems (UAS) to remain well clear of other aircraft. Detect and Avoid (DAA) capabilities are one potential technology being examined to maintain separation. To evaluate these DAA capabilities, input traffic scenarios are needed, but current approaches are limited by the breadth of the traffic recordings available. This thesis derives a new mathematical algorithm that uses great circle navigation equations in an Earth spherical model and an accurate aircraft performance model …

Assessment Of Top-Down Adaptation Measures To Sea Level Rise Risk In Kafr Elsheikh Governorate, Egypt, Sara Khalil Elmorsy

Mansoura Engineering Journal

Egypt is considered one of the top five countries expected to be most impacted with a 1m SLR by the year 2100. This paper discusses top-down adaptation measures and efforts to protect Kafr Elsheikh Governorate from SLR risk, by reviewing several national environmental plans and frameworks. It reviews how the national adaptation plans are implemented on a local level and the overlaps and gaps between them. It shows many adaptation measures conducted in the area, most of them are to face beach erosion and inundation. It has been noted that there are no studies or governmental efforts to protect the …

Critical Review Of Building Usability In Historic Cairo, Ahmad Salah El-Din, Mohand Ali Foda, Sherif A. Sheta, Lamis El Gizawi

Mansoura Engineering Journal

The value of heritage buildings and their surroundings has developed due to the change of the first functional purpose for which they were built. Many old heritage areas as well as the urban surroundings of the old Seat of Government such as Salah El-Din Citadel in Cairo suffer from neglect and increasing deterioration of its urban settings. The study aims to formulate an integrated urban strategy to help conservation of the historic seats of government buildings and their surroundings to adapt with new functions and developed land use. The selected case of the study is Salah El-Din square in Historic …

Dynamics And Scaling Of Particle Streaks In High-Reynolds-Number Turbulent Boundary Layers, Tim Berk, Filippo Coletti

Mechanical and Aerospace Engineering Faculty Publications

Inertial particles in wall-bounded turbulence are known to form streaks, but experimental evidence and predictive understanding of this phenomenon is lacking, especially in regimes relevant to atmospheric flows. We carry out wind tunnel measurements to investigate this process, characterizing the transport of microscopic particles suspended in turbulent boundary layers. The friction Reynolds number Re_𝜏 = O(10⁴) allows for significant scale separation and the emergence of large-scale motions, while the range of viscous Stokes number St⁺ = 18–870 is relevant to the transport of dust and fine sand in the atmospheric surface layer. We …