| dc.description.abstract | This study area is situated at the northern part of Chuhuangkeng Anticline, the main purpose of the study is to analyze the relationship between hydrologic characteristics and the sliding potential of the land slope.
The main rock strata outcrop in the study area are Cholan Formation, Chinshui Shale, Kueichulin Formation and Shangfuchi Sandstone; the main geologic structures lying from west to east are Chinshui Anticline, Jenlung Syncline and Chuhuangkeng Anticline respectively. Fold axes strike approximately in the direction of N30oE and are nearly parallel to each other.
With a basis of 2-D Limit Analysis, STABL 6 program in FORTRAN language has been used in slope stability analysis Direct shear tests on rock cores were performed to obtain the cohesion c and the angle of internal friction ψ, which in turn are the basic mechanical factors in programmed slope stability analysis. Graphical slope stability analysis has also been performed based on rock strata attitudes collected in field survey and mechanical factors. Overall analysis has been done by considering all the results from slope stability analyses as well as the drainage density and distribution maps.
The study shows that the slope with lower gradient, lower strata dips, and dense drainage density and distribution bears the least sliding potential; while the slope with higher gradient, higher strata dips, and loose drainage density bears the most sliding potential. The dip slope in one side of the river banks gives relatively higher sliding potential than the opposite. At the place of meander turning, strong stream erosion happens at the outer part of the meander, and the under-cutting action at the toe of the river bank results to potentially unstable slopes; while the deposited inner part of the rivers show stable, gentle slope. | en_US |