Numerical Analysis of the Impact of Underlying Karst Cave Expansion on Roadbed Stability
That concealment and developmental characteristics of the karst caves in the roadbed have are important hidden dangers for road traffic safety.In order to explore the impact of karst cave expansion on the stability of karst roadbeds,a numerical model of roadbeds containing karst cave is established by FLAC3D to analyze the stability of karst roadbeds under four working conditions of karst cave expand upwards,downwards,to both sides,in all direc-tions.Research shown that the vertical deformation will increase and stability of the roadbed will decrease with the development and expansion of karst caves in the roadbed;When the karst cave expands upwards,the newly added deformation mainly occurs above the karst cave,which will cause a rapid decrease in the stability of the roadbed;When the karst cave expands to both sides,it has also adverse impacts.But compared with the expansion upwards of the karst cave,the impact is relatively smaller;Under four working conditions,the expansion in all directions has the greatest impact on the stability of the karst roadbed,followed by upward expansion and bilateral expansion.When the karst cave extends downwards,it causes an increase in deformation of the bottom plate and two sides of the karst cave,but has little impact on the stability of the karst roadbed.
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