INFLUENCES OF THE LAYER THICKNESS ON THE DISTRIBUTION OF STRESS AND DEFORMATION OF THE ROCK MASS AROUND ADITS – A CASE STUDY

DOI: 10.18503/2309-7434-2021-1(17)-30-39

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Authors:

TRAN TUAN MINH, Ph.D., Associate Professor, Faculty of Civil Engineering, Hanoi University of Mining and Geology, Vietnam

NGUYEN DUYEN PHONG, Ph.D., Faculty of Civil Engineering, Hanoi University of Mining and Geology, Vietnam

DANG TRUNG THANH, Ph.D., Associate Professor, Faculty of Civil Engineering, Hanoi University of Mining and Geology, Vietnam

Abstract: Excavation of adits in the rock mass for underground mining will be changed the state of initial stress in the rock mass, besides established the new stress state in rock mass around openings, respectively. The secondary stress state has influence on the design of stability for adits. Nowadays the estimation of stress and deformation around adits in bedding rocks is limited. One of many factors concerns to the values and directions of earth pressure on supports is ratio between span of adits and thickness of rock mass layers. This paper refers to assessment of the stress and deformation around adits and internal forces in steel ribs when changing ratio span of adits and thickness of rock mass layers in bedding rocks in the Quang Ninh underground mines of Vietnam.

Key words: stress, deformation, adits, layer thickness, steel ribs.

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