Temat: boring machine - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Behavior of damaged TBM tunnel under MJS and Micro-disturbance grouting treatment: a case study
Autorzy:: Feng, Shi
Yang, Yijun
Jiang, Yexiang
Li, Yongdi
Yao, Lianghao
Chen, Xiaolong
Powiązania:: https://bibliotekanauki.pl/articles/27312101.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: system strumieniowy metra
tunel
uszkodzenie
TBM
technologia
iniekcja mikrozakłóceniowa
naprawa
metro jet system
damage
tunnel boring machine
tunnel
micro-disturbance grouting
technology
treatment
Opis:: The operating subway tunnel is often damaged due to excessive deformation in China. In order to ensure the safe for operation, remediation and protection measures must be taken, especially in soft soil areas. This paper presents a case study on remedial scheme of damaged TBM (Tunnel Boring Machine) tunnel adjacent to excavation combining with MJS (Metro Jet System) and micro-disturbance grouting technology in Hangzhou, China. The track bed settlement, horizontal displacement and convergence of the TBM tunnel caused by MJS and micro-disturbance grouting construction were analyzed and discussed. The results showed the characteristics of soil layer under the tunnel have significant influence on the treatment effect. Even if multiple grouting was adopted, the treatment failure may occur under the combination action of external loads such as traffic load or surcharge load, which should be considered when civil engineers design remediation scheme. The results can provide practical experience and guidance for similar treatment scheme of damaged TBM tunnel.
Źródło:: Archives of Civil Engineering; 2023, 69, 2; 339--352
1230-2945
Pojawia się w:: Archives of Civil Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Avoiding chatter by means of active damping systems for machine tools
Autorzy:: Brecher, C.
Baumler, S.
Brockmann, B.
Powiązania:: https://bibliotekanauki.pl/articles/99996.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tools
milling
grinding
boring
chatter
active damping system
Opis:: Chatter in machining processes is strong dependent on the dynamic compliance behaviour of the machine tool and workpiece. The critical cutting depth where chatter occurs is in inverse proportion to the absolute value of the negative real part of the complex dynamic compliance response function of the machine tool. Therefore, while designing a machine tool, its dynamic behaviour should be investigated and optimized, e.g. by using the finite element method. If further design optimization are not possible, active damping system might help avoiding chatter of the machine tool. Active damping systems can compensate the dynamic displacements between tool centre point of the machine tool and workpiece by applying dynamically correlated external energ (e.g. compensation forces) onto the machine structure. Next to an explanation of the general idea and systemizatio of active damping systems, this paper gives examples of recent research activities in the field of active damping systems for machine tools of the Laboratory for Machine Tools and Production Engineering (WZL) of Aachen University, Germany. The main challenges while designing active damping systems for machine tools are carved out.
Źródło:: Journal of Machine Engineering; 2013, 13, 3; 117-128
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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