Open AccessStudy on constraint degree calculation of frozen shaft inner wall mass concrete
Author(s) -
Fangzheng Li,
Jiwei Zhang,
Weidong Wu,
Jin Ye,
Jin Xiaogang
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2011/1/012038
Subject(s) - inner mongolia , structural engineering , materials science , mass concrete , degree (music) , thermal , computer simulation , curing (chemistry) , mechanics , composite material , engineering , physics , china , thermodynamics , political science , law , acoustics
Based on the circle-shaped air shaft of Hong Qing-He coal mine located in Inner Mongolia China, the thermal-mechanical numerical model of frozen shaft inner wall mass concrete was established under complex thermal-mechanical boundary, including internal heating, external cold source, friction constraints, above shaft load and lateral pressure. The evolution characteristics of temperature-displacement field of inner wall were analysed. According to numerical simulation results, the constraint degree at the middle section of inner wall concrete is calculated. In the early stage (0-10d), the constraint degree of inner wall fluctuates within 60-99% as curing time goes. Three protection measures to delete confinement degree of mass concrete shaft wall were proposed, including (1) Reducing the friction between inner and outer walls; (2) Reducing hydration heat release of mass concrete; (3) Reducing the temperature difference between inner and outer walls during curing.