Mechanical behaviour and acoustic emission characteristics of the reinforced soft muddy rock under various moisture content levels  

作　　者：Haoyu Rong Wei Wang Guichen Li Guangming Zhao Dongxu Liang Jiahui Xu 

机构地区：[1]College of Civil and Transportation Engineering,Hohai University,Nanjing,China [2]School of Mines,Key Laboratory of Deep Coal Resource Mining,Ministry of Education of China,China University of Mining and Technology,Xuzhou,China [3]School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan,China [4]School of Civil Engineering,Xuzhou University of Technology,Xuzhou,China

出　　处：《International Journal of Coal Science & Technology》2024年第6期139-157,共19页国际煤炭科学技术学报(英文)

基　　金：financially supported by the National Natural Science Foundation of China(U22A20165,12072102,52174089).

摘　　要：In order to investigate the failure mechanism of the reinforced muddy soft rock under the influence of the hydration reaction when ground water is present,a series of confined compressive tests and Acoustic Emission(AE)recordings were conducted subject to various moisture content levels and lateral confining stresses.It was found that the failure modes of the reinforced rock specimen were affected by the moisture content level and the lateral stress σ_(2) in a way that the load bearing capacity of the reinforced rock would increase with the lateral stress σ_(2) but decrease as the moisture content increased.An increase in the moisture content would reduce the extent of the influence of the lateral stress on the load bearing capacity of the reinforced rock.In addition,much less AE counts were recorded when the moisture content increased indicating that the crack initiation and propagation in this case was easier due to the reduction of the required external input energy.With increasing moisture content,the failure mode of the specimen gradually changes from sudden and brittle to progressive and ductile.Moreover,the hydration reaction became more significant leading to a complete debonding between the grout and the rock.Consequently,the reinforcement provided by the rock bolt to the rock became negligible.

关 键 词：MUDSTONE Anchorage structure Reinforced rock HYDRATION Bearing capacity 

分 类 号：TU452[建筑科学—岩土工程]