Results 41 to 50 of about 47,571 (265)

Investigation on the failure evolution characteristics of surrounding rock in deep cross‐fault roadway: Based on physical model test and numerical simulation

Deep Underground Science and Engineering, EarlyView.
This study reveals the failure evolution characteristics of deep cross‐fault roadway surrounding rock under excavation support and periodic weighting. Periodic weighting readily induces fault activation, with the spatial distribution of failed rock masses being controlled by the fault strike and dip.
Tiezhu Li, Suping Peng, Jing Zheng, Zhanhua Yang, Qijun Tian   +4 more
wiley   +1 more source

Trajectory Planning and Tracking With Multiobjective Optimization for Connected and Automated Vehicles at Expressway On-Ramps

Journal of Advanced Transportation
On-ramp merging is a common expressway maneuver for connected and automated vehicles (CAVs), where trajectory planning and tracking control are central to avoiding collisions. However, existing studies rarely optimize the selection of merge start and end
Zhibo Gao, Lan Yao, Jin Li, Yanduo Yin, Jian Xiang, Kejun Long   +5 more
doaj   +1 more source

Eco-Friendly Bitumen Composites with Polymer and Rubber Waste for Sustainable Construction

Buildings
The modern road industry requires a more effective solution according to efficiency and minimizing environmental burden. This article discusses the use of recycled materials to modify bitumen binders within the concept of the circular economy.
Gaini Zhumagalievna Seitenova, Rizagul Muslimovna Dyussova, Daulet Abaykhanovich Aspanbetov, Assel Yermekovna Jexembayeva, Kinga Korniejenko, Lyazat Aruova, Darkhan Kuandykovich Sakanov   +6 more
doaj   +1 more source

Research progress on bolt support theory and technology of coal mine roadway in China

Meikuang Anquan, 2023
With the increasing depth of roadway and the complexity of mine environment in China, the challenge of roadway bolt support will be more serious. Based on the investigation of relevant literature, the related theories of roadway bolt support were ...
TANG Jinzhao, FAN Lidan, ZHANG Jiyun, XU Feng, YU Liwei, YANG Jie, ZHAO Wei
doaj   +1 more source

Level of Service Program for INDOT Operations [PDF]

, 2012
INDOT has used an inspection program named Maintenance Quality Survey (MQS) to perform a state-wide inspection of their roadway assets, right-of-way to right-of-way.
McCullouch, Bob
core   +1 more source

Mechanism of “seesaw‐type” rock burst in coal seam mining beneath mountainous areas

Deep Underground Science and Engineering, EarlyView.
This study reveals the mechanism of “seesaw‐type” rock bursts during coal mining beneath mountainous areas. The advancing working face induces nonuniform fracturing of the overburden. The detached mountain mass then undergoes a seesaw‐type rotational movement around a shifting pivot, driving the primary fracture through a characteristic “open‐close ...
Chao Zhou, Xueqiu He, Zhenlei Li, Ping Wang, Dazhao Song, Fuxing Jiang, Shan Yin, Anliang Lü, Menghan Wei, Taoping Zhong   +9 more
wiley   +1 more source

Aerodynamic and Dry Deposition Effects of Roadside Trees on NO_x Concentration Changes on Roadways and Sidewalks

Atmosphere
This study analyzes changes in NOx concentrations due to the aerodynamic and dry deposition effects of roadside trees in the Jongno area, a central business district of Seoul, Republic of Korea, using a computational fluid dynamics (CFD) model.
Yeon-Uk Kim, Seung-Bok Lee, Chang Hyeok Kim, Seonyeop Lee, Kyung-Hwan Kwak   +4 more
doaj   +1 more source

Dynamic prediction of coal and gas outburst risk based on quantitative analysis of stress–energy evolution and adaptive correction

Deep Underground Science and Engineering, EarlyView.
This study quantitatively analyzed the spatiotemporal evolution of stress redistribution ahead of the working face by integrating coal seam distribution, tectonic stress anomalies, gas pressure, and mining‐induced disturbances. An R‐value criterion for coal and gas outburst (CGO) risk assessment was established based on energy principles.
Yingjie Zhao, Xueqiu He, Dazhao Song, Liming Qiu, Minggong Guo, Jie Liu, Qiang Liu, Yi Zhu   +7 more
wiley   +1 more source

Developing a universal tunnel span classification from global tunnel databases

Deep Underground Science and Engineering, EarlyView.
A universal tunnel span classification system is introduced that incorporates tunnel span, cross‐sectional area, typical tunnel types, and intended uses. Representative flatness ratio values are also provided for each span class. The classification is derived from a comprehensive database of 450 tunnel profiles from 47 countries.
Simon Heru Prassetyo, Inzagi Suhendar, Semmy Andrew Anugerah Djawa Tagi, Bonifacio Bondan Satryojati, Dzakwan Naufal Pratama, Yeremia Sintong Damero, Yudhidya Wicaksana, Erwin Lim, Ridho Kresna Wattimena   +8 more
wiley   +1 more source

Design principle and engineering practice of rock bolting to prevent coal bump from rib coal massive slippage

Meitan kexue jishu
Rock burst is one of the disasters that seriously affect the safe and effective mining of coal in mine mining. It is of great significance and value to study the principle and technology of bolt anti-impact support to prevent and control the rock burst ...
Jun HAN, Guanghan LI, Baolong GUO, Shuangwen MA, Chen CAO   +4 more
doaj   +1 more source