Abstract:

Aiming at the difficulty to treat the stratum-absence and stratum- reversion situation, some researches on the method for complex stratum-line based on drill hole database are carried out. On the consideration of the single stratum continuity and the mutual influence of strata, a new algorithm is proposed to search the reference points of stratum boundary, which can deal with six special situations of stratum-absence and stratum- reversion. Meanwhile combined with cubic spline interpolation function, the second arithmetic modifying the point position is used to smooth the Stratum-line. The results of applying this aforementioned method to the digital profile mapping of Guangdong Meihe Expressway Project, indicate that the mapping precision is consistent with the maps from the investigation reports, and could provide some reference and guidance for the engineering design and construction.

Key words: stratum-line, stratum absence and reversion, reference point searching, cubic spline interpolation, smoothing process