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Received: 10 November 2019 Accepted: 20 January 2020 The characteristics of rock face dissolution reflect to a certain extent the degree of karst development at the construction site and whether the conditions of karst foundation are good or not, so they can be used as a basis for the design of building foundation. However, huge amounts of reliable rock face data obtained in engineering practice have not been fully utilized, and the studies on rock face dissolution characteristics are still immature, which is an important reason why the dissolution characteristics analysis of karst foundation is often inconsistent with the engineering reality and leads to engineering incidents. With the terminal building at Nanning Wuxu International Airport as an engineering background, this paper defines the rock face dissolution rate as the ratio between the rock face dissolution height and the formation dissolution height (in percentage) and uses it as the index to characterize rock face dissolution degree, and then establishes a method to solve the rock face dissolution rate curve and reveals the distribution pattern of rock face dissolution degree with depth in karst building foundations. According to the results of the study, the rock face dissolution rate of karst building foundations in the karst terrain of Southwest China generally declines exponentially with the depth increasing, and when it is expressed as an exponential function of height, the fitting correlation coefficient can generally be up to more than 0.90. When there are no less than 12 drill holes with spacing of no more than 20m in the site, the rock face dissolution rate curve shows good numerical stability, with the error being generally within 15%, which is sufficient engineering precision.

Distribution Pattern of Rock Face Dissolution Degree with Depth in Building Foundation in the Karst Terrain of Southwest China