EFFECTS OF LINING JOINTS ON THE STABILITY OF ROADWAYS IN VIETNAMESE COAL MINES

Abstract

Using heavy supports with a high bearing capacity of the load by precast concrete lining is a
limited problem in other underground mines in Viet Nam. This solution avoids the excavation for expansion and
increases the stability of roadways during operation. Most of the cases reported in the literature focus on
considering the effect of geological conditions, roadway size, the depth of roadways, and excavation methods on
the stability of roadways in a continuous rock mass with behaviors of isotropic and linear-elastic. In addition,
these reports only consider the types of supports such as rock bolts, steel ribs, shotcrete and the combination of
these supports. These cases also do not consider the effect of joints between segments in the precast concrete
lining and roadways excavated in bedding rocks. This paper introduces the analysis of the stability of roadways
in weak rocks using precast concrete lining base on using a two-dimensional finite element model in the Quang
Ninh underground mines of Viet Nam. The results show a certain influence of joint distribution, joint number on
the stability of roadways in the continuous and bedding rock mass.