地层数字制图中纵、横分界线控制搜索新算法

A new algorithm for digital mapping of stratum based on control and searching method of vertical and horizontal dividing line

针对目前地层数字连线中处理地层缺失和倒转困难的问题,考虑6种地层缺失和倒转情形,提出了纵、横向结合地层分界线控制点搜索算法。将剖面图绘制视为一个多层地层区域组合叠加的过程,在保持地层连续性的前提下兼顾各地层相互之间的影响,有效处理了地层倒转、缺失问题,在此基础上提出一种增加虚拟点、微调已有点的新算法。结合3次样条插值函数,对绘制出的剖面图进行修正,实现了地层光滑连线,达到了地层无缝、无重叠组合的效果。将提出的复杂地层连线新方法应用于广东梅河高速公路工程数字制图中,构造出的地层分布图像准确性好,比较符合实际,可以为工程的勘察、设计和施工提供参考。

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 carded 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.