Abstract
Because of the long-term dissolution of water, the formation of karst caves and fissures in rock formations are called karst. In Karst area, deformation and water damage are the main forms of karst damage to subgrade. Uneven settlement of embankment and instability of subgrade are the concrete manifestations of karst roadbed diseases. Therefore, considering the scale effect of karst, the concrete treatment measures of karst roadbed should be put forward and the principle of prevention and treatment of “dredging, crossing, reinforcing and blocking” should be followed, based on the characteristics of various karst forms, such as section funnel, depression, karst cave, solution crack and karst spring.
Highlights
Karst is a generic term, which is the chemical dissolution of soluble rock, such as limestone and dolomite, dissolved in water, and accompanied by mechanical actions to form groove, fissure, caves, as well as a series of phenomena and effects, such as cavitation caused by cave roof collapse
In Karst area, deformation and water damage are the main forms of karst damage to subgrade
Uneven settlement of embankment and instability of subgrade are the concrete manifestations of karst roadbed diseases
Summary
Karst is a generic term, which is the chemical dissolution of soluble rock, such as limestone and dolomite, dissolved in water, and accompanied by mechanical actions to form groove, fissure, caves, as well as a series of phenomena and effects, such as cavitation caused by cave roof collapse. Because there are karst caves, dissolution fractures and hidden rivers in the karst area, the ground deformation and foundation collapse may occur under the weight of rock body, which will affect the safety of road structures. Due to the movement of ground water, inundation and other sudden accidents may appear in the structure of the site or the foundation [1]. Its genesis, scale, mechanical characteristics and evolution law are all different, which makes the construction of roads. For example the occurrence of the karst ground collapse accident in some places brought negative impacts on progress, quality and cost of the projects. This paper will put forward concrete measures of roadbed treatment in karst area with the background of a specific project, by discussing the formation mechanism, distribution, morphology and development characteristics of karst
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