Results 51 to 60 of about 1,591 (253)

Research on blast over and under excavation control for large waterway engineering projects based on digital twin technology

Shuili Shuiyun Gongcheng Xuebao
With the development of inland waterway and sea-river interconnection projects, underwater borehole blasting is essential to channel improvement, harbor basin dredging, and cofferdam demolition. In waterway engineering projects, over and under excavation
WANG Xianzhang, TAO Haohao, JIANG Xianliang, ZHONG Dongwang, XIAO Tao, DONG Yongchang   +5 more
doaj   +1 more source

Selecting the optimal drilling and blasting design for underground excavations in underground copper mine 'Jama' Bor [PDF]

Podzemni Radovi, 2018
Drilling and blasting operations are very important part of underground excavation design. They should be performed in accordance with some criteria, such as fragmentation, excavation stability and cost.
Bogdanović Dejan, Stojanović Goran
doaj  

Development of a Model to Predict Vibrations Induced by Blasting Excavation of Deep Rock Masses under High In Situ Stress

Shock and Vibration, 2020
During the process of blasting excavation of deep rock masses under high in situ stress, energy produced by the explosive and the strain energy released by rock mass excavation constitute the energy source of vibration.
Yong Fan, Xianze Cui, Zhendong Leng, Yurong Zhou, Junwei Zheng, Feng Wang   +5 more
doaj   +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

Comparative Study of the Excavation Damage and Rockburst of the Deeply Buried Jinping II Diversion Tunnels Using a TBM and the Drilling-Blasting Method

Advances in Civil Engineering, 2020
The rock mass failure induced by high in-situ stresses during the excavation of deep diversion tunnels is one of the key problems in the construction of the Jinping II Hydropower Station.
Jing Yang, Xing-Guo Yang, Jia-Wen Zhou, Yong Liu, Bao-Shun Dong, Hai-Bo Li   +5 more
doaj   +1 more source

Differential sensitivity to SHH signaling and neural crest‐mediated Gas1 expression regulate jaw size during development and evolution

Developmental Dynamics, EarlyView.
Abstract Background Developmental control of jaw size is crucial to prevent birth defects and facilitate evolutionary adaptation. We have shown that jaw size is established by neural crest mesenchyme (NCM), which are progenitor cells that migrate into the mandibular primordia and produce the jaws.
Zuzana Vavrušová, Daniel B. Chu, An Nguyen, Yeniko Ta, Jennifer L. Fish, Richard A. Schneider   +5 more
wiley   +1 more source

A Consideration on the Estimation of Blasting Vibration in Tunnel Excavation.

Shigen-to-Sozai, 1992
Estimation of blasting vibration is important for the safety control in blasting work. In the previous report about the blasting vibration in tunnel excavation, the authors proposed a method to predict the amplitude spectrum of blasting vibration.In the present paper, a method to predict the maximum amplitude of blasting vibration is proposed ...
HIRATA, Atsuo, KANEKO, Katsuhiko
openaire   +2 more sources

Study on Roof‐Control Technology for Gob‐Side Entry Retaining Under Composite Roofs

Energy Science &Engineering, EarlyView.
This study develops a roof‐control technology system for gob‐side entry retaining under composite roofs. By integrating field measurements, theoretical analysis, and numerical simulation, it reveals the spatiotemporal evolution of the plastic zone and proposes a targeted support method, providing theoretical and practical guidance for safe and ...
Dong Li, Yujiang Zhang, Yunlou Du, Haodong Zheng, Baoji Yang   +4 more
wiley   +1 more source

Complex Modeling of the Effects of Blasting on the Stability of Surrounding Rocks and Embankment in Water-Conveyance Tunnels

Complexity, 2018
Blasting in water-conveyance tunnels that cross rivers is vital for the safety and stability of embankments. In this work, a tunnel project that crosses the Yellow River in the north district of the first-phase Eastern Line of the South-to-North Water ...
Xian-qi Zhou, Jin Yu, Jin-bi Ye, Shi-yu Liu, Ren-guo Liao, Xiu-wen Li   +5 more
doaj   +1 more source

Analysis of Gene Expression in Aedes aegypti Suggests Changes in Early Genetic Control of Mosquito Development

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, EarlyView.
ABSTRACT Aedes aegypti, a critical vector for tropical diseases, poses significant challenges for studying its embryogenesis due to difficulties in removing its rigid chorion and achieving effective fixation for in situ hybridization. Here, we present novel methodologies for fixation, dechorionation, DAPI staining, and in situ hybridization, enabling ...
Renata Coutinho‐dos‐Santos, Danielle Santos, Lupis Ribeiro, Jonathan J. Mucherino‐Muñoz, Marcelle Uhl, Carlos Logullo, A. Mendonça‐Amarante, M. Fantappie, Rodrigo Nunes‐da‐Fonseca   +8 more
wiley   +1 more source