In the area covered with thick overburden layers

deep coal mining practice has formed many collapse basins in the surface of the earth and the landscape of these areas has been changed according to the geological reconnaissance. Engineering properties of soils

which scattered in the layers around the collapse basin

existed slightly difference from the original ones on the basis of geological exploration. Further study showed that not only the structure of soil but also the physico-mechanica indices of soil within a certain range of collapse basins were influenced by the collapse. Geological exploration including drilling exploration and cone penetration test (CPT) had been done to testify these conclusions. Because of stratigraphic succession has the property of time series

the specific penetration resistance

which changed along the depth

gathered through CPT can be regard as time series naturally. With the aid of non-dynamic theory

we calculated fractal dimensions of each CPT curves along an exploration line and wanted to find something different between them; the results show that simple fractal dimensions along the exploration line became smaller and smaller as the prospecting holes getting closer to the collapse basin. This consequence illustrates that collapse basin caused by deep coal mining could do spatial effect on the soil around it. The outcomes are consistent with the geotechnical testing indices of soil samples and also are confirmed by multi-fractal spectrum and partition function