Abstract
Abstract. The Huafan University campus is located in the Ta-lun Shan area in northern Taiwan, which is characterized by a dip slope covered by colluvium soil of various depths. For slope disaster prevention, a monitoring system was constructed that consisted of inclinometers, tiltmeters, crack gages, groundwater level observation wells, settlement and displacement observation marks, rebar strain gages, concrete strain gages, and rain gages. The monitoring data derived from hundreds of settlement and displacement observation marks were analyzed and compared with the displacement recorded by inclinometers. The analysis results revealed that the maximum settlement and displacement were concentrated on the areas around the Hui-Tsui, Zhi-An, and Wu-Ming buildings and coincided with periods of heavy rainfall. The computer program STABL was applied for slope stability analysis and modeling of slope failure. For prevention of slope instability, a drainage system and tieback anchors with additional stability measures were proposed to discharge excess groundwater following rainfall. Finally, threshold value curves of rainfall based on slope displacement were proposed. The curves can be applied for predicting slope stability when typhoons are expected to bring heavy rainfall and should be significant in slope disaster prevention.
Highlights
Colluvium soils on slope surfaces in Taiwan are products of strong weathering and erosion of geological material owing to sub- and tropical climate and are generally characterized by looseness in composition, large porosity, high permeability, and, low stability
Summarization of the results allowed the establishment of stabilization measures and rainfall threshold values
The findings indicate that the primary slope displacement is toward the southwest and south directions
Summary
Colluvium soils on slope surfaces in Taiwan are products of strong weathering and erosion of geological material owing to sub- and tropical climate and are generally characterized by looseness in composition, large porosity, high permeability, and, low stability. Li and Zhang (2008) discussed the stability of colluvium soil slopes during rainstorms. Jeng and Lin (2011) documented the variation of matrix suction of colluvium soil in different precipitation conditions with varying vegetation at the same site as this paper. In their study, both the in situ monitoring results and laboratory tests for the undisturbed specimens taken from the field were analyzed. Most studies merely correlate rainfall records with the disaster event and seldom consider slope displacement for determining a threshold value. Threshold value curves that consider the displacement of slopes due to typhoon rainfall are established
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