Specifications

Language: Chinese

ISSN: 10031243

Document type: Journal article (JA)

Publisher: Tsinghua University Press, Beijing, 100084, China

Abstract: The underground cavern group of the Ludila hydropower station is one of the

largest underground projects on Jinsha River. When its excavation was completed, a number of

splits appeared at its downstream spandrel, a similar phenomena that has been found in other

underground powerhouses. This work took the Ludila underground powerhouse as a case study

to find the causes for such phenomenon that is vital to stability of large caverns, and to explore

reasonable reinforcement measures, through analyzing the geological features, initial stress,

monitored displacements and numerical simulations. The results indicate that stress

concentration was induced by tilt geo-stress and anisotropy of the rock mass and rock deflection

at the downstream spandrel under excavation unloading. A concept of deflection index is put

forth for evaluation of the depths and range of the splits. © copyright.

Number of references: 4

Main heading: Rocks

Controlled terms: Caves - Convergence of numerical methods - Excavation -

Numerical analysis - Soil mechanics - Stress concentration - Underground power

plants - Unloading

Uncontrolled terms: Cracking mechanisms - Excavation unloading - Geo-stress -

Geological features - Hydropower stations - Initial stress - Rock and soil mechanics -

Rock mass - Rock stratums - Underground cavern group - Underground opening -

Underground powerhouse

Classification code: 921.6 Numerical Methods - 674.1 Small Marine Craft - 614 Steam

Power Plants - 613 Nuclear Power Plants - 502.1 Mine and Quarry Operations - 483.1

Soils and Soil Mechanics - 481.1 Geology - 422 Strength of Building Materials; Test

Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties

Database: Compendex

Accession number: 20130315915407

Title: Temperature-rise performance of steel balls coated with CrCN thick films

Authors: Jia, Guixi1 ; Chang, Jiadong1 ; Li, Yan2 ; Xie, Yintao3/贾贵西;常家东;李言;谢银涛

Author affiliation:

1 Luoyang Institute of Science and Technology, Luoyang 471023, China

2 School of Mechanical and Instrumental Engineering, Xi'an University of Technology, Xi'an

710048, China

3 China Aviation Optical-Electrical Technology Co. Ltd., Luoyang 471003, China

Corresponding author: Jia, G. (jiaguixi06@163.com)

Source title: Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology

Abbreviated source title: Zhenkong Kexue yu Jishu Xuebao

Volume: 32

Issue: 12

Issue date: December 2012