Results 121 to 130 of about 128,534 (314)

Study on the failure mechanism of the shield excavation face in the sandy cobble stratum under different buried depths

Deep Underground Science and Engineering, EarlyView.
Abstract One of the significant challenges faced in shield tunnel construction is the risk of collapse resulting from abrupt changes in soil conditions in advance of the working face, particularly within the sandy cobble stratum. This study aims to effectively manage these sudden variations and to further investigate the failure mechanisms associated ...
Hua Jiang, Chongyang Liu, Ao Zhang, Xiaoyan Zhang, Yuhang Li   +4 more
wiley   +1 more source

Geomechanical Substantiation of Soil Stability During Tunnel Construction by Shield Tunneling Complexes in Layered Massifs

Eng
This paper presents the development and results of an analytical method for calculating the stability coefficient of a rock mass that is capable of adjusting the face support pressure required for face stability depending on changes in the mass structure
Anatoly Protosenya, Vsevolod Kumov
doaj   +1 more source

Optimization of cut‐hole layout under high in situ stress based on numerical simulation and field tests

Deep Underground Science and Engineering, EarlyView.
This study investigates the blast‐induced rock damage patterns under different cut‐hole layouts and ground stress conditions through numerical simulations and field tests. The findings in this study provide valuable insights for similar underground engineering applications.
Junjie Zhao, Diyuan Li, P. G. Ranjith, Xinxin Lü, Yanliang Li, Xiaoli Su   +5 more
wiley   +1 more source

Explosives and Incendiaries Used in Terrorist Attacks on Public Surface Transportation: A Preliminary Empirical Analysis, MTI Report WP 09-02 [PDF]

, 2010
This report provides data on terrorist attacks against public surface transportation targets and serious crimes committed against such targets throughout the world.
Butterworth, Bruce R., Jenkins, Brian M.
core   +1 more source

Resonance‐induced restoration of rock permeability degraded by heavy components of crude oil

Deep Underground Science and Engineering, EarlyView.
Resonance‐induced changes occur in filtration properties of sedimentary rocks in crude paraffin oil flow under acoustic vibrations. Experimental data on (a) pressure drop; (b) permeability; (c) pressure at the rock inlet; and (d) pressure at the rock outlet are presented.
Evgenii Riabokon, Qian Yin, Mikhail Guzev, Mikhail Turbakov, Evgenii Kozhevnikov, Nadezhda Riabokon, Ivan Panteleev   +6 more
wiley   +1 more source

Safety Evaluation for Subway Shield Tunnel Structures Considering Assembly Errors

Chengshi guidao jiaotong yanjiu
ObjectiveTo eliminate the impact of assembly errors on the safety stress evaluation of a shield tunnel target ring structure, it is necessary to study a new method for the health and safety monitoring and evaluation of underground structures.
Shunxin ZHOU, Xuezeng LIU, Weiyuan JIN, Shuang DING, Gang SHI   +4 more
doaj   +1 more source

IMPACT OF STRAY CURRENTS IN ELECTRICAL SYSTEMS OF UNDERGROUND TRANSPORT: AN OVERVIEW AND METHODS FOR SOLVING PROBLEMS [PDF]

, 2018
The metro system in the modern world is widely used in the urban transport system. Nevertheless, many negative consequences, such as electrochemical corrosion on the metro route caused by a wandering current, endanger the metal ...
BOLSHENKO, Oleksandr, GOLOVCHENKO, Anatoliy   +1 more
core  

Rockburst prediction based on data preprocessing and hyperband‐RNN‐DNN

Deep Underground Science and Engineering, EarlyView.
A data preprocessing workflow is proposed to address challenges in rockburst data analysis. Coupled algorithms preprocess the data set, and hyperband optimization is used to enhance RNN performance. Results show that preprocessing improves accuracy, while dense layers enhance model stability and prediction performance.
Yong Fan, Chenxi Yin, Guangdong Yang, Shengyong Ding, Bin Tian   +4 more
wiley   +1 more source

Comparative Analysis of Fatigue Strength of Welded Frame Based on UIC and JIS Standards

机车电传动, 2019
Using UIC standard Goodman-Smith diagram method and JIS standard fatigue evaluation method, the side beam welding structure of the subway bogie frame was taken as the research object, whose fatigue strength was contrastive studied by using finite element
Shangyuan LIU, Guangwu YANG, Shoune XIAO, Bing YANG, Tao ZHU   +4 more
doaj  

Failure characteristics and the energy criterion of rock with a through‐going joint under true‐triaxial unloading conditions: Insights from the DEM model

Deep Underground Science and Engineering, EarlyView.
The rock failure mode is significantly influenced by the contributing factors, such as the joint inclination, the initial confining pressure, and the unloading point. We found six typical rock failure modes after a large number of numerical tests. Abstract Excavation unloading damages rock masses, with preferential failure along geological defects in ...
Fei Liu, Changhui Liang, Sijia Liu, Yongjun Zhang, Luo Wang   +4 more
wiley   +1 more source