Hydrogeological factors for active slope movement of terrace

• Main Authors: Chu-Yu Chen, 陳筑佑
• Other Authors: J.J Dong
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/65557540775961799581

碩士 === 國立中央大學 === 應用地質研究所 === 93 === The terrace of northwestern of Taiwan part often takes place slides after torrential rain. This have close connection, geological phenomenon and topography, geology, and hydrology factor. This text regards the south reason of HuKou terrace recuring collapse as the case, probe into: (1) anisotropic and heterogeneous of hydraulic conductivity of Poorly cemented and stratified sandstone, mudstone and shale , and (2) the free aquifer of terrace gravel contact sandstone, mudstone and shale, influence opposite side slope and groundwater flow, and influence that pore water pressure distributes on slip face. This research utilizes limited difference to divide the law procedure FLAC (Fast Lagranglan Analysis of Continua ) to carry on the simulation that the groundwater flowed. the In base of core noted down and the field permeability test, we set up the hydrogeological conceptual models of the studying area, and combining March of 2003 ~ January of 2005 water pressure monitors to calibrate the hydrogeological conceptual model and parameters . According to the model numerical simulation result after calibrating, we use back-analysis in order to obtain the relevant material parameter of the south reason of HuKou terrace and stratum in this research. For find out about hydrogeological factor to the south reason of HuKou terrace that takes place slides frequently, this research carry on parameter susceptibility analysis with steady to analysis in slope, in order to understand that every hydrogeological characteristic is to slipping the influence of pore water pressure and slope safety coefficient on the slip face. The result of study shows that anisotropic and heterogeneous of hydraulic conductivity and the free aquifer of gravel terrace both influence highly pore watwer pressure distribution on the slope, therefore influence the effect strength, resisting shear strength and safety factor of the slope. Slope of one layer of sides as to not exactly closing sandstone, mudstone and shale in Pleistocene covering terrace gravel each other, hydrology geologic process slippery activity act the influence that can't be ignored.